leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Browse Source 
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4: (61 commits)
  ext4: Documention update for new ordered mode and delayed allocation
  ext4: do not set extents feature from the kernel
  ext4: Don't allow nonextenst mount option for large filesystem
  ext4: Enable delalloc by default.
  ext4: delayed allocation i_blocks fix for stat
  ext4: fix delalloc i_disksize early update issue
  ext4: Handle page without buffers in ext4_*_writepage()
  ext4: Add ordered mode support for delalloc
  ext4: Invert lock ordering of page_lock and transaction start in delalloc
  mm: Add range_cont mode for writeback
  ext4: delayed allocation ENOSPC handling
  percpu_counter: new function percpu_counter_sum_and_set
  ext4: Add delayed allocation support in data=writeback mode
  vfs: add hooks for ext4's delayed allocation support
  jbd2: Remove data=ordered mode support using jbd buffer heads
  ext4: Use new framework for data=ordered mode in JBD2
  jbd2: Implement data=ordered mode handling via inodes
  vfs: export filemap_fdatawrite_range()
  ext4: Fix lock inversion in ext4_ext_truncate()
  ext4: Invert the locking order of page_lock and transaction start
  ...
This commit is contained in:
Linus Torvalds 2008-07-15 08:36:38 -07:00
commit 8d2567a620
35 changed files with 2820 additions and 1057 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

125
Documentation/filesystems/ext4.txt
View File

@ -13,72 +13,93 @@ Mailing list: linux-ext4@vger.kernel.org
1. Quick usage instructions:
===========================
- Grab updated e2fsprogs from
ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs-interim/
This is a patchset on top of e2fsprogs-1.39, which can be found at
- Compile and install the latest version of e2fsprogs (as of this
writing version 1.41) from:
http://sourceforge.net/project/showfiles.php?group_id=2406
or
ftp://ftp.kernel.org/pub/linux/kernel/people/tytso/e2fsprogs/
- It's still mke2fs -j /dev/hda1
or grab the latest git repository from:
- mount /dev/hda1 /wherever -t ext4dev
git://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git
- To enable extents,
- Create a new filesystem using the ext4dev filesystem type:
mount /dev/hda1 /wherever -t ext4dev -o extents
# mke2fs -t ext4dev /dev/hda1
- The filesystem is compatible with the ext3 driver until you add a file
which has extents (ie: `mount -o extents', then create a file).
Or configure an existing ext3 filesystem to support extents and set
the test_fs flag to indicate that it's ok for an in-development
filesystem to touch this filesystem:
NOTE: The "extents" mount flag is temporary. It will soon go away and
extents will be enabled by the "-o extents" flag to mke2fs or tune2fs
# tune2fs -O extents -E test_fs /dev/hda1
If the filesystem was created with 128 byte inodes, it can be
converted to use 256 byte for greater efficiency via:
# tune2fs -I 256 /dev/hda1
(Note: we currently do not have tools to convert an ext4dev
filesystem back to ext3; so please do not do try this on production
filesystems.)
- Mounting:
# mount -t ext4dev /dev/hda1 /wherever
- When comparing performance with other filesystems, remember that
ext3/4 by default offers higher data integrity guarantees than most. So
when comparing with a metadata-only journalling filesystem, use `mount -o
data=writeback'. And you might as well use `mount -o nobh' too along
with it. Making the journal larger than the mke2fs default often helps
performance with metadata-intensive workloads.
ext3/4 by default offers higher data integrity guarantees than most.
So when comparing with a metadata-only journalling filesystem, such
as ext3, use `mount -o data=writeback'. And you might as well use
`mount -o nobh' too along with it. Making the journal larger than
the mke2fs default often helps performance with metadata-intensive
workloads.
2. Features
===========
2.1 Currently available
* ability to use filesystems > 16TB
* ability to use filesystems > 16TB (e2fsprogs support not available yet)
* extent format reduces metadata overhead (RAM, IO for access, transactions)
* extent format more robust in face of on-disk corruption due to magics,
* internal redunancy in tree
2.1 Previously available, soon to be enabled by default by "mkefs.ext4":
* dir_index and resize inode will be on by default
* large inodes will be used by default for fast EAs, nsec timestamps, etc
* improved file allocation (multi-block alloc)
* fix 32000 subdirectory limit
* nsec timestamps for mtime, atime, ctime, create time
* inode version field on disk (NFSv4, Lustre)
* reduced e2fsck time via uninit_bg feature
* journal checksumming for robustness, performance
* persistent file preallocation (e.g for streaming media, databases)
* ability to pack bitmaps and inode tables into larger virtual groups via the
flex_bg feature
* large file support
* Inode allocation using large virtual block groups via flex_bg
* delayed allocation
* large block (up to pagesize) support
* efficent new ordered mode in JBD2 and ext4(avoid using buffer head to force
the ordering)
2.2 Candidate features for future inclusion
There are several under discussion, whether they all make it in is
partly a function of how much time everyone has to work on them:
* Online defrag (patches available but not well tested)
* reduced mke2fs time via lazy itable initialization in conjuction with
the uninit_bg feature (capability to do this is available in e2fsprogs
but a kernel thread to do lazy zeroing of unused inode table blocks
after filesystem is first mounted is required for safety)
* improved file allocation (multi-block alloc, delayed alloc; basically done)
* fix 32000 subdirectory limit (patch exists, needs some e2fsck work)
* nsec timestamps for mtime, atime, ctime, create time (patch exists,
needs some e2fsck work)
* inode version field on disk (NFSv4, Lustre; prototype exists)
* reduced mke2fs/e2fsck time via uninitialized groups (prototype exists)
* journal checksumming for robustness, performance (prototype exists)
* persistent file preallocation (e.g for streaming media, databases)
There are several others under discussion, whether they all make it in is
partly a function of how much time everyone has to work on them. Features like
metadata checksumming have been discussed and planned for a bit but no patches
exist yet so I'm not sure they're in the near-term roadmap.
Features like metadata checksumming have been discussed and planned for
a bit but no patches exist yet so I'm not sure they're in the near-term
roadmap.
The big performance win will come with mballoc, delalloc and flex_bg
grouping of bitmaps and inode tables. Some test results available here:
The big performance win will come with mballoc and delalloc. CFS has
been using mballoc for a few years already with Lustre, and IBM + Bull
did a lot of benchmarking on it. The reason it isn't in the first set of
patches is partly a manageability issue, and partly because it doesn't
directly affect the on-disk format (outside of much better allocation)
so it isn't critical to get into the first round of changes. I believe
Alex is working on a new set of patches right now.
- http://www.bullopensource.org/ext4/20080530/ffsb-write-2.6.26-rc2.html
- http://www.bullopensource.org/ext4/20080530/ffsb-readwrite-2.6.26-rc2.html
3. Options
==========
@ -222,9 +243,11 @@ stripe=n Number of filesystem blocks that mballoc will try
to use for allocation size and alignment. For RAID5/6
systems this should be the number of data
disks * RAID chunk size in file system blocks.
delalloc (*) Deferring block allocation until write-out time.
nodelalloc Disable delayed allocation. Blocks are allocation
when data is copied from user to page cache.
Data Mode
---------
=========
There are 3 different data modes:
* writeback mode
@ -236,10 +259,10 @@ typically provide the best ext4 performance.
* ordered mode
In data=ordered mode, ext4 only officially journals metadata, but it logically
groups metadata and data blocks into a single unit called a transaction. When
it's time to write the new metadata out to disk, the associated data blocks
are written first. In general, this mode performs slightly slower than
writeback but significantly faster than journal mode.
groups metadata information related to data changes with the data blocks into a
single unit called a transaction. When it's time to write the new metadata
out to disk, the associated data blocks are written first. In general,
this mode performs slightly slower than writeback but significantly faster than journal mode.
* journal mode
data=journal mode provides full data and metadata journaling. All new data is
@ -247,7 +270,8 @@ written to the journal first, and then to its final location.
In the event of a crash, the journal can be replayed, bringing both data and
metadata into a consistent state. This mode is the slowest except when data
needs to be read from and written to disk at the same time where it
outperforms all others modes.
outperforms all others modes. Curently ext4 does not have delayed
allocation support if this data journalling mode is selected.
References
==========
@ -256,7 +280,8 @@ kernel source: <file:fs/ext4/>
<file:fs/jbd2/>
programs: http://e2fsprogs.sourceforge.net/
http://ext2resize.sourceforge.net
useful links: http://fedoraproject.org/wiki/ext3-devel
http://www.bullopensource.org/ext4/
http://ext4.wiki.kernel.org/index.php/Main_Page
http://fedoraproject.org/wiki/Features/Ext4

19
fs/buffer.c
View File

@ -1691,11 +1691,13 @@ static int __block_write_full_page(struct inode *inode, struct page *page,
*/
clear_buffer_dirty(bh);
set_buffer_uptodate(bh);
} else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
} else if ((!buffer_mapped(bh) || buffer_delay(bh)) &&
buffer_dirty(bh)) {
WARN_ON(bh->b_size != blocksize);
err = get_block(inode, block, bh, 1);
if (err)
goto recover;
clear_buffer_delay(bh);
if (buffer_new(bh)) {
/* blockdev mappings never come here */
clear_buffer_new(bh);
@ -1774,7 +1776,8 @@ recover:
bh = head;
/* Recovery: lock and submit the mapped buffers */
do {
if (buffer_mapped(bh) && buffer_dirty(bh)) {
if (buffer_mapped(bh) && buffer_dirty(bh) &&
!buffer_delay(bh)) {
lock_buffer(bh);
mark_buffer_async_write(bh);
} else {
@ -2061,6 +2064,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
struct page *page, void *fsdata)
{
struct inode *inode = mapping->host;
int i_size_changed = 0;
copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
@ -2073,12 +2077,21 @@ int generic_write_end(struct file *file, struct address_space *mapping,
*/
if (pos+copied > inode->i_size) {
i_size_write(inode, pos+copied);
mark_inode_dirty(inode);
i_size_changed = 1;
}
unlock_page(page);
page_cache_release(page);
/*
* Don't mark the inode dirty under page lock. First, it unnecessarily
* makes the holding time of page lock longer. Second, it forces lock
* ordering of page lock and transaction start for journaling
* filesystems.
*/
if (i_size_changed)
mark_inode_dirty(inode);
return copied;
}
EXPORT_SYMBOL(generic_write_end);

217
fs/ext4/balloc.c
View File

@ -47,7 +47,7 @@ static int ext4_block_in_group(struct super_block *sb, ext4_fsblk_t block,
ext4_group_t block_group)
{
ext4_group_t actual_group;
ext4_get_group_no_and_offset(sb, block, &actual_group, 0);
ext4_get_group_no_and_offset(sb, block, &actual_group, NULL);
if (actual_group == block_group)
return 1;
return 0;
@ -121,12 +121,7 @@ unsigned ext4_init_block_bitmap(struct super_block *sb, struct buffer_head *bh,
le16_to_cpu(sbi->s_es->s_reserved_gdt_blocks);
}
} else { /* For META_BG_BLOCK_GROUPS */
int group_rel = (block_group -
le32_to_cpu(sbi->s_es->s_first_meta_bg)) %
EXT4_DESC_PER_BLOCK(sb);
if (group_rel == 0 || group_rel == 1 ||
(group_rel == EXT4_DESC_PER_BLOCK(sb) - 1))
bit_max += 1;
bit_max += ext4_bg_num_gdb(sb, block_group);
}
if (block_group == sbi->s_groups_count - 1) {
@ -295,7 +290,7 @@ err_out:
return 0;
}
/**
* read_block_bitmap()
* ext4_read_block_bitmap()
* @sb: super block
* @block_group: given block group
*
@ -305,7 +300,7 @@ err_out:
* Return buffer_head on success or NULL in case of failure.
*/
struct buffer_head *
read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
{
struct ext4_group_desc * desc;
struct buffer_head * bh = NULL;
@ -409,8 +404,7 @@ restart:
prev = rsv;
}
printk("Window map complete.\n");
if (bad)
BUG();
BUG_ON(bad);
}
#define rsv_window_dump(root, verbose) \
__rsv_window_dump((root), (verbose), __func__)
@ -694,7 +688,7 @@ do_more:
count -= overflow;
}
brelse(bitmap_bh);
bitmap_bh = read_block_bitmap(sb, block_group);
bitmap_bh = ext4_read_block_bitmap(sb, block_group);
if (!bitmap_bh)
goto error_return;
desc = ext4_get_group_desc (sb, block_group, &gd_bh);
@ -810,6 +804,13 @@ do_more:
spin_unlock(sb_bgl_lock(sbi, block_group));
percpu_counter_add(&sbi->s_freeblocks_counter, count);
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
spin_lock(sb_bgl_lock(sbi, flex_group));
sbi->s_flex_groups[flex_group].free_blocks += count;
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
/* We dirtied the bitmap block */
BUFFER_TRACE(bitmap_bh, "dirtied bitmap block");
err = ext4_journal_dirty_metadata(handle, bitmap_bh);
@ -1598,23 +1599,35 @@ out:
/**
* ext4_has_free_blocks()
* @sbi: in-core super block structure.
* @sbi: in-core super block structure.
* @nblocks: number of neeed blocks
*
* Check if filesystem has at least 1 free block available for allocation.
* Check if filesystem has free blocks available for allocation.
* Return the number of blocks avaible for allocation for this request
* On success, return nblocks
*/
static int ext4_has_free_blocks(struct ext4_sb_info *sbi)
ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
ext4_fsblk_t nblocks)
{
ext4_fsblk_t free_blocks, root_blocks;
ext4_fsblk_t free_blocks;
ext4_fsblk_t root_blocks = 0;
free_blocks = percpu_counter_read_positive(&sbi->s_freeblocks_counter);
root_blocks = ext4_r_blocks_count(sbi->s_es);
if (free_blocks < root_blocks + 1 && !capable(CAP_SYS_RESOURCE) &&
if (!capable(CAP_SYS_RESOURCE) &&
sbi->s_resuid != current->fsuid &&
(sbi->s_resgid == 0 || !in_group_p (sbi->s_resgid))) {
return 0;
}
return 1;
}
(sbi->s_resgid == 0 || !in_group_p(sbi->s_resgid)))
root_blocks = ext4_r_blocks_count(sbi->s_es);
#ifdef CONFIG_SMP
if (free_blocks - root_blocks < FBC_BATCH)
free_blocks =
percpu_counter_sum_and_set(&sbi->s_freeblocks_counter);
#endif
if (free_blocks - root_blocks < nblocks)
return free_blocks - root_blocks;
return nblocks;
}
/**
* ext4_should_retry_alloc()
@ -1630,7 +1643,7 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi)
*/
int ext4_should_retry_alloc(struct super_block *sb, int *retries)
{
if (!ext4_has_free_blocks(EXT4_SB(sb)) || (*retries)++ > 3)
if (!ext4_has_free_blocks(EXT4_SB(sb), 1) || (*retries)++ > 3)
return 0;
jbd_debug(1, "%s: retrying operation after ENOSPC\n", sb->s_id);
@ -1639,20 +1652,24 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
}
/**
* ext4_new_blocks_old() -- core block(s) allocation function
* ext4_old_new_blocks() -- core block bitmap based block allocation function
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
* @count: target number of blocks to allocate
* @errp: error code
*
* ext4_new_blocks uses a goal block to assist allocation. It tries to
* allocate block(s) from the block group contains the goal block first. If that
* fails, it will try to allocate block(s) from other block groups without
* any specific goal block.
* ext4_old_new_blocks uses a goal block to assist allocation and look up
* the block bitmap directly to do block allocation. It tries to
* allocate block(s) from the block group contains the goal block first. If
* that fails, it will try to allocate block(s) from other block groups
* without any specific goal block.
*
* This function is called when -o nomballoc mount option is enabled
*
*/
ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
struct buffer_head *bitmap_bh = NULL;
@ -1676,13 +1693,26 @@ ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
ext4_group_t ngroups;
unsigned long num = *count;
*errp = -ENOSPC;
sb = inode->i_sb;
if (!sb) {
*errp = -ENODEV;
printk("ext4_new_block: nonexistent device");
return 0;
}
sbi = EXT4_SB(sb);
if (!EXT4_I(inode)->i_delalloc_reserved_flag) {
/*
* With delalloc we already reserved the blocks
*/
*count = ext4_has_free_blocks(sbi, *count);
}
if (*count == 0) {
*errp = -ENOSPC;
return 0; /*return with ENOSPC error */
}
num = *count;
/*
* Check quota for allocation of this block.
*/
@ -1706,11 +1736,6 @@ ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
if (block_i && ((windowsz = block_i->rsv_window_node.rsv_goal_size) > 0))
my_rsv = &block_i->rsv_window_node;
if (!ext4_has_free_blocks(sbi)) {
*errp = -ENOSPC;
goto out;
}
/*
* First, test whether the goal block is free.
*/
@ -1734,7 +1759,7 @@ retry_alloc:
my_rsv = NULL;
if (free_blocks > 0) {
bitmap_bh = read_block_bitmap(sb, group_no);
bitmap_bh = ext4_read_block_bitmap(sb, group_no);
if (!bitmap_bh)
goto io_error;
grp_alloc_blk = ext4_try_to_allocate_with_rsv(sb, handle,
@ -1770,7 +1795,7 @@ retry_alloc:
continue;
brelse(bitmap_bh);
bitmap_bh = read_block_bitmap(sb, group_no);
bitmap_bh = ext4_read_block_bitmap(sb, group_no);
if (!bitmap_bh)
goto io_error;
/*
@ -1882,7 +1907,15 @@ allocated:
le16_add_cpu(&gdp->bg_free_blocks_count, -num);
gdp->bg_checksum = ext4_group_desc_csum(sbi, group_no, gdp);
spin_unlock(sb_bgl_lock(sbi, group_no));
percpu_counter_sub(&sbi->s_freeblocks_counter, num);
if (!EXT4_I(inode)->i_delalloc_reserved_flag)
percpu_counter_sub(&sbi->s_freeblocks_counter, num);
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi, group_no);
spin_lock(sb_bgl_lock(sbi, flex_group));
sbi->s_flex_groups[flex_group].free_blocks -= num;
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
BUFFER_TRACE(gdp_bh, "journal_dirty_metadata for group descriptor");
err = ext4_journal_dirty_metadata(handle, gdp_bh);
@ -1915,46 +1948,104 @@ out:
return 0;
}
ext4_fsblk_t ext4_new_block(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, int *errp)
#define EXT4_META_BLOCK 0x1
static ext4_fsblk_t do_blk_alloc(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, ext4_fsblk_t goal,
unsigned long *count, int *errp, int flags)
{
struct ext4_allocation_request ar;
ext4_fsblk_t ret;
if (!test_opt(inode->i_sb, MBALLOC)) {
unsigned long count = 1;
ret = ext4_new_blocks_old(handle, inode, goal, &count, errp);
return ret;
return ext4_old_new_blocks(handle, inode, goal, count, errp);
}
memset(&ar, 0, sizeof(ar));
ar.inode = inode;
ar.goal = goal;
ar.len = 1;
ret = ext4_mb_new_blocks(handle, &ar, errp);
return ret;
}
/* Fill with neighbour allocated blocks */
ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
struct ext4_allocation_request ar;
ext4_fsblk_t ret;
if (!test_opt(inode->i_sb, MBALLOC)) {
ret = ext4_new_blocks_old(handle, inode, goal, count, errp);
return ret;
}
memset(&ar, 0, sizeof(ar));
ar.inode = inode;
ar.goal = goal;
ar.len = *count;
ar.logical = iblock;
if (S_ISREG(inode->i_mode) && !(flags & EXT4_META_BLOCK))
/* enable in-core preallocation for data block allocation */
ar.flags = EXT4_MB_HINT_DATA;
else
/* disable in-core preallocation for non-regular files */
ar.flags = 0;
ret = ext4_mb_new_blocks(handle, &ar, errp);
*count = ar.len;
return ret;
}
/*
* ext4_new_meta_blocks() -- allocate block for meta data (indexing) blocks
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
* @count: total number of blocks need
* @errp: error code
*
* Return 1st allocated block numberon success, *count stores total account
* error stores in errp pointer
*/
ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp)
{
ext4_fsblk_t ret;
ret = do_blk_alloc(handle, inode, 0, goal,
count, errp, EXT4_META_BLOCK);
/*
* Account for the allocated meta blocks
*/
if (!(*errp)) {
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
EXT4_I(inode)->i_allocated_meta_blocks += *count;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
}
return ret;
}
/*
* ext4_new_meta_block() -- allocate block for meta data (indexing) blocks
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
* @errp: error code
*
* Return allocated block number on success
*/
ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, int *errp)
{
unsigned long count = 1;
return ext4_new_meta_blocks(handle, inode, goal, &count, errp);
}
/*
* ext4_new_blocks() -- allocate data blocks
*
* @handle: handle to this transaction
* @inode: file inode
* @goal: given target block(filesystem wide)
* @count: total number of blocks need
* @errp: error code
*
* Return 1st allocated block numberon success, *count stores total account
* error stores in errp pointer
*/
ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, ext4_fsblk_t goal,
unsigned long *count, int *errp)
{
return do_blk_alloc(handle, inode, iblock, goal, count, errp, 0);
}
/**
* ext4_count_free_blocks() -- count filesystem free blocks
@ -1986,7 +2077,7 @@ ext4_fsblk_t ext4_count_free_blocks(struct super_block *sb)
continue;
desc_count += le16_to_cpu(gdp->bg_free_blocks_count);
brelse(bitmap_bh);
bitmap_bh = read_block_bitmap(sb, i);
bitmap_bh = ext4_read_block_bitmap(sb, i);
if (bitmap_bh == NULL)
continue;

17
fs/ext4/dir.c
View File

@ -129,7 +129,8 @@ static int ext4_readdir(struct file * filp,
struct buffer_head *bh = NULL;
map_bh.b_state = 0;
err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh, 0, 0);
err = ext4_get_blocks_wrap(NULL, inode, blk, 1, &map_bh,
0, 0, 0);
if (err > 0) {
pgoff_t index = map_bh.b_blocknr >>
(PAGE_CACHE_SHIFT - inode->i_blkbits);
@ -272,7 +273,7 @@ static void free_rb_tree_fname(struct rb_root *root)
while (n) {
/* Do the node's children first */
if ((n)->rb_left) {
if (n->rb_left) {
n = n->rb_left;
continue;
}
@ -301,24 +302,18 @@ static void free_rb_tree_fname(struct rb_root *root)
parent->rb_right = NULL;
n = parent;
}
root->rb_node = NULL;
}
static struct dir_private_info *create_dir_info(loff_t pos)
static struct dir_private_info *ext4_htree_create_dir_info(loff_t pos)
{
struct dir_private_info *p;
p = kmalloc(sizeof(struct dir_private_info), GFP_KERNEL);
p = kzalloc(sizeof(struct dir_private_info), GFP_KERNEL);
if (!p)
return NULL;
p->root.rb_node = NULL;
p->curr_node = NULL;
p->extra_fname = NULL;
p->last_pos = 0;
p->curr_hash = pos2maj_hash(pos);
p->curr_minor_hash = pos2min_hash(pos);
p->next_hash = 0;
return p;
}
@ -433,7 +428,7 @@ static int ext4_dx_readdir(struct file * filp,
int ret;
if (!info) {
info = create_dir_info(filp->f_pos);
info = ext4_htree_create_dir_info(filp->f_pos);
if (!info)
return -ENOMEM;
filp->private_data = info;

61
fs/ext4/ext4.h
View File

@ -22,7 +22,7 @@
#include "ext4_i.h"
/*
* The second extended filesystem constants/structures
* The fourth extended filesystem constants/structures
*/
/*
@ -45,7 +45,7 @@
#define ext4_debug(f, a...) \
do { \
printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
__FILE__, __LINE__, __FUNCTION__); \
__FILE__, __LINE__, __func__); \
printk (KERN_DEBUG f, ## a); \
} while (0)
#else
@ -74,6 +74,9 @@
#define EXT4_MB_HINT_GOAL_ONLY 256
/* goal is meaningful */
#define EXT4_MB_HINT_TRY_GOAL 512
/* blocks already pre-reserved by delayed allocation */
#define EXT4_MB_DELALLOC_RESERVED 1024
struct ext4_allocation_request {
/* target inode for block we're allocating */
@ -170,6 +173,15 @@ struct ext4_group_desc
__u32 bg_reserved2[3];
};
/*
* Structure of a flex block group info
*/
struct flex_groups {
__u32 free_inodes;
__u32 free_blocks;
};
#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
#define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
#define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
@ -527,6 +539,7 @@ do { \
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
#define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
#define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
/* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
#ifndef _LINUX_EXT2_FS_H
#define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
@ -647,7 +660,10 @@ struct ext4_super_block {
__le16 s_mmp_interval; /* # seconds to wait in MMP checking */
__le64 s_mmp_block; /* Block for multi-mount protection */
__le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
__u32 s_reserved[163]; /* Padding to the end of the block */
__u8 s_log_groups_per_flex; /* FLEX_BG group size */
__u8 s_reserved_char_pad2;
__le16 s_reserved_pad;
__u32 s_reserved[162]; /* Padding to the end of the block */
};
#ifdef __KERNEL__
@ -958,12 +974,17 @@ extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
ext4_group_t group);
extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
extern ext4_fsblk_t ext4_new_meta_block(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, int *errp);
extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
extern ext4_fsblk_t ext4_new_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock, ext4_fsblk_t goal,
unsigned long *count, int *errp);
extern ext4_fsblk_t ext4_old_new_blocks(handle_t *handle, struct inode *inode,
ext4_fsblk_t goal, unsigned long *count, int *errp);
extern ext4_fsblk_t ext4_has_free_blocks(struct ext4_sb_info *sbi,
ext4_fsblk_t nblocks);
extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
ext4_fsblk_t block, unsigned long count, int metadata);
extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
@ -1016,9 +1037,14 @@ extern int __init init_ext4_mballoc(void);
extern void exit_ext4_mballoc(void);
extern void ext4_mb_free_blocks(handle_t *, struct inode *,
unsigned long, unsigned long, int, unsigned long *);
extern int ext4_mb_add_more_groupinfo(struct super_block *sb,
ext4_group_t i, struct ext4_group_desc *desc);
extern void ext4_mb_update_group_info(struct ext4_group_info *grp,
ext4_grpblk_t add);
/* inode.c */
void ext4_da_release_space(struct inode *inode, int used, int to_free);
int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
struct buffer_head *bh, ext4_fsblk_t blocknr);
struct buffer_head *ext4_getblk(handle_t *, struct inode *,
@ -1033,19 +1059,23 @@ int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
extern struct inode *ext4_iget(struct super_block *, unsigned long);
extern int ext4_write_inode (struct inode *, int);
extern int ext4_setattr (struct dentry *, struct iattr *);
extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);
extern void ext4_delete_inode (struct inode *);
extern int ext4_sync_inode (handle_t *, struct inode *);
extern void ext4_discard_reservation (struct inode *);
extern void ext4_dirty_inode(struct inode *);
extern int ext4_change_inode_journal_flag(struct inode *, int);
extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
extern int ext4_can_truncate(struct inode *inode);
extern void ext4_truncate (struct inode *);
extern void ext4_set_inode_flags(struct inode *);
extern void ext4_get_inode_flags(struct ext4_inode_info *);
extern void ext4_set_aops(struct inode *inode);
extern int ext4_writepage_trans_blocks(struct inode *);
extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
extern int ext4_block_truncate_page(handle_t *handle,
struct address_space *mapping, loff_t from);
extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct page *page);
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
@ -1159,10 +1189,21 @@ struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
}
static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
ext4_group_t block_group)
{
return block_group >> sbi->s_log_groups_per_flex;
}
static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
{
return 1 << sbi->s_log_groups_per_flex;
}
#define ext4_std_error(sb, errno) \
do { \
if ((errno)) \
__ext4_std_error((sb), __FUNCTION__, (errno)); \
__ext4_std_error((sb), __func__, (errno)); \
} while (0)
/*
@ -1191,7 +1232,7 @@ extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
ext4_lblk_t iblock,
unsigned long max_blocks, struct buffer_head *bh_result,
int create, int extend_disksize);
extern void ext4_ext_truncate(struct inode *, struct page *);
extern void ext4_ext_truncate(struct inode *);
extern void ext4_ext_init(struct super_block *);
extern void ext4_ext_release(struct super_block *);
extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
@ -1199,7 +1240,7 @@ extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
sector_t block, unsigned long max_blocks,
struct buffer_head *bh, int create,
int extend_disksize);
int extend_disksize, int flag);
#endif /* __KERNEL__ */
#endif /* _EXT4_H */

1
fs/ext4/ext4_extents.h
View File

@ -212,6 +212,7 @@ static inline int ext4_ext_get_actual_len(struct ext4_extent *ext)
(le16_to_cpu(ext->ee_len) - EXT_INIT_MAX_LEN));
}
extern int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks);
extern ext4_fsblk_t idx_pblock(struct ext4_extent_idx *);
extern void ext4_ext_store_pblock(struct ext4_extent *, ext4_fsblk_t);
extern int ext4_extent_tree_init(handle_t *, struct inode *);

10
fs/ext4/ext4_i.h
View File

@ -79,7 +79,7 @@ struct ext4_ext_cache {
};
/*
* third extended file system inode data in memory
* fourth extended file system inode data in memory
*/
struct ext4_inode_info {
__le32 i_data[15]; /* unconverted */
@ -150,6 +150,7 @@ struct ext4_inode_info {
*/
struct rw_semaphore i_data_sem;
struct inode vfs_inode;
struct jbd2_inode jinode;
unsigned long i_ext_generation;
struct ext4_ext_cache i_cached_extent;
@ -162,6 +163,13 @@ struct ext4_inode_info {
/* mballoc */
struct list_head i_prealloc_list;
spinlock_t i_prealloc_lock;
/* allocation reservation info for delalloc */
unsigned long i_reserved_data_blocks;
unsigned long i_reserved_meta_blocks;
unsigned long i_allocated_meta_blocks;
unsigned short i_delalloc_reserved_flag;
spinlock_t i_block_reservation_lock;
};
#endif /* _EXT4_I */

21
fs/ext4/ext4_jbd2.h
View File

@ -142,19 +142,17 @@ int __ext4_journal_dirty_metadata(const char *where,
handle_t *handle, struct buffer_head *bh);
#define ext4_journal_get_undo_access(handle, bh) \
__ext4_journal_get_undo_access(__FUNCTION__, (handle), (bh))
__ext4_journal_get_undo_access(__func__, (handle), (bh))
#define ext4_journal_get_write_access(handle, bh) \
__ext4_journal_get_write_access(__FUNCTION__, (handle), (bh))
__ext4_journal_get_write_access(__func__, (handle), (bh))
#define ext4_journal_revoke(handle, blocknr, bh) \
__ext4_journal_revoke(__FUNCTION__, (handle), (blocknr), (bh))
__ext4_journal_revoke(__func__, (handle), (blocknr), (bh))
#define ext4_journal_get_create_access(handle, bh) \
__ext4_journal_get_create_access(__FUNCTION__, (handle), (bh))
__ext4_journal_get_create_access(__func__, (handle), (bh))
#define ext4_journal_dirty_metadata(handle, bh) \
__ext4_journal_dirty_metadata(__FUNCTION__, (handle), (bh))
__ext4_journal_dirty_metadata(__func__, (handle), (bh))
#define ext4_journal_forget(handle, bh) \
__ext4_journal_forget(__FUNCTION__, (handle), (bh))
int ext4_journal_dirty_data(handle_t *handle, struct buffer_head *bh);
__ext4_journal_forget(__func__, (handle), (bh))
handle_t *ext4_journal_start_sb(struct super_block *sb, int nblocks);
int __ext4_journal_stop(const char *where, handle_t *handle);
@ -165,7 +163,7 @@ static inline handle_t *ext4_journal_start(struct inode *inode, int nblocks)
}
#define ext4_journal_stop(handle) \
__ext4_journal_stop(__FUNCTION__, (handle))
__ext4_journal_stop(__func__, (handle))
static inline handle_t *ext4_journal_current_handle(void)
{
@ -192,6 +190,11 @@ static inline int ext4_journal_force_commit(journal_t *journal)
return jbd2_journal_force_commit(journal);
}
static inline int ext4_jbd2_file_inode(handle_t *handle, struct inode *inode)
{
return jbd2_journal_file_inode(handle, &EXT4_I(inode)->jinode);
}
/* super.c */
int ext4_force_commit(struct super_block *sb);

5
fs/ext4/ext4_sb.h
View File

@ -25,7 +25,7 @@
#include <linux/rbtree.h>
/*
* third extended-fs super-block data in memory
* fourth extended-fs super-block data in memory
*/
struct ext4_sb_info {
unsigned long s_desc_size; /* Size of a group descriptor in bytes */
@ -143,6 +143,9 @@ struct ext4_sb_info {
/* locality groups */
struct ext4_locality_group *s_locality_groups;
unsigned int s_log_groups_per_flex;
struct flex_groups *s_flex_groups;
};
#endif /* _EXT4_SB */

111
fs/ext4/extents.c
View File

@ -92,17 +92,16 @@ static void ext4_idx_store_pblock(struct ext4_extent_idx *ix, ext4_fsblk_t pb)
ix->ei_leaf_hi = cpu_to_le16((unsigned long) ((pb >> 31) >> 1) & 0xffff);
}
static handle_t *ext4_ext_journal_restart(handle_t *handle, int needed)
static int ext4_ext_journal_restart(handle_t *handle, int needed)
{
int err;
if (handle->h_buffer_credits > needed)
return handle;
if (!ext4_journal_extend(handle, needed))
return handle;
err = ext4_journal_restart(handle, needed);
return handle;
return 0;
err = ext4_journal_extend(handle, needed);
if (err)
return err;
return ext4_journal_restart(handle, needed);
}
/*
@ -180,15 +179,18 @@ static ext4_fsblk_t ext4_ext_find_goal(struct inode *inode,
return bg_start + colour + block;
}
/*
* Allocation for a meta data block
*/
static ext4_fsblk_t
ext4_ext_new_block(handle_t *handle, struct inode *inode,
ext4_ext_new_meta_block(handle_t *handle, struct inode *inode,
struct ext4_ext_path *path,
struct ext4_extent *ex, int *err)
{
ext4_fsblk_t goal, newblock;
goal = ext4_ext_find_goal(inode, path, le32_to_cpu(ex->ee_block));
newblock = ext4_new_block(handle, inode, goal, err);
newblock = ext4_new_meta_block(handle, inode, goal, err);
return newblock;
}
@ -246,6 +248,36 @@ static int ext4_ext_space_root_idx(struct inode *inode)
return size;
}
/*
* Calculate the number of metadata blocks needed
* to allocate @blocks
* Worse case is one block per extent
*/
int ext4_ext_calc_metadata_amount(struct inode *inode, int blocks)
{
int lcap, icap, rcap, leafs, idxs, num;
int newextents = blocks;
rcap = ext4_ext_space_root_idx(inode);
lcap = ext4_ext_space_block(inode);
icap = ext4_ext_space_block_idx(inode);
/* number of new leaf blocks needed */
num = leafs = (newextents + lcap - 1) / lcap;
/*
* Worse case, we need separate index block(s)
* to link all new leaf blocks
*/
idxs = (leafs + icap - 1) / icap;
do {
num += idxs;
idxs = (idxs + icap - 1) / icap;
} while (idxs > rcap);
return num;
}
static int
ext4_ext_max_entries(struct inode *inode, int depth)
{
@ -524,6 +556,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
alloc = 1;
}
path[0].p_hdr = eh;
path[0].p_bh = NULL;
i = depth;
/* walk through the tree */
@ -552,12 +585,14 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block,
}
path[ppos].p_depth = i;
path[ppos].p_hdr = eh;
path[ppos].p_ext = NULL;
path[ppos].p_idx = NULL;
/* find extent */
ext4_ext_binsearch(inode, path + ppos, block);
/* if not an empty leaf */
if (path[ppos].p_ext)
path[ppos].p_block = ext_pblock(path[ppos].p_ext);
ext4_ext_show_path(inode, path);
@ -688,7 +723,8 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
/* allocate all needed blocks */
ext_debug("allocate %d blocks for indexes/leaf\n", depth - at);
for (a = 0; a < depth - at; a++) {
newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
newblock = ext4_ext_new_meta_block(handle, inode, path,
newext, &err);
if (newblock == 0)
goto cleanup;
ablocks[a] = newblock;
@ -884,7 +920,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
ext4_fsblk_t newblock;
int err = 0;
newblock = ext4_ext_new_block(handle, inode, path, newext, &err);
newblock = ext4_ext_new_meta_block(handle, inode, path, newext, &err);
if (newblock == 0)
return err;
@ -981,6 +1017,8 @@ repeat:
/* if we found index with free entry, then use that
* entry: create all needed subtree and add new leaf */
err = ext4_ext_split(handle, inode, path, newext, i);
if (err)
goto out;
/* refill path */
ext4_ext_drop_refs(path);
@ -1883,11 +1921,9 @@ ext4_ext_rm_leaf(handle_t *handle, struct inode *inode,
credits += 2 * EXT4_QUOTA_TRANS_BLOCKS(inode->i_sb);
#endif
handle = ext4_ext_journal_restart(handle, credits);
if (IS_ERR(handle)) {
err = PTR_ERR(handle);
err = ext4_ext_journal_restart(handle, credits);
if (err)
goto out;
}
err = ext4_ext_get_access(handle, inode, path + depth);
if (err)
@ -2529,6 +2565,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
int err = 0, depth, ret;
unsigned long allocated = 0;
struct ext4_allocation_request ar;
loff_t disksize;
__clear_bit(BH_New, &bh_result->b_state);
ext_debug("blocks %u/%lu requested for inode %u\n",
@ -2616,8 +2653,7 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
*/
if (allocated > max_blocks)
allocated = max_blocks;
/* mark the buffer unwritten */
__set_bit(BH_Unwritten, &bh_result->b_state);
set_buffer_unwritten(bh_result);
goto out2;
}
@ -2716,14 +2752,19 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
goto out2;
}
if (extend_disksize && inode->i_size > EXT4_I(inode)->i_disksize)
EXT4_I(inode)->i_disksize = inode->i_size;
/* previous routine could use block we allocated */
newblock = ext_pblock(&newex);
allocated = ext4_ext_get_actual_len(&newex);
outnew:
__set_bit(BH_New, &bh_result->b_state);
if (extend_disksize) {
disksize = ((loff_t) iblock + ar.len) << inode->i_blkbits;
if (disksize > i_size_read(inode))
disksize = i_size_read(inode);
if (disksize > EXT4_I(inode)->i_disksize)
EXT4_I(inode)->i_disksize = disksize;
}
set_buffer_new(bh_result);
/* Cache only when it is _not_ an uninitialized extent */
if (create != EXT4_CREATE_UNINITIALIZED_EXT)
@ -2733,7 +2774,7 @@ out:
if (allocated > max_blocks)
allocated = max_blocks;
ext4_ext_show_leaf(inode, path);
__set_bit(BH_Mapped, &bh_result->b_state);
set_buffer_mapped(bh_result);
bh_result->b_bdev = inode->i_sb->s_bdev;
bh_result->b_blocknr = newblock;
out2:
@ -2744,7 +2785,7 @@ out2:
return err ? err : allocated;
}
void ext4_ext_truncate(struct inode * inode, struct page *page)
void ext4_ext_truncate(struct inode *inode)
{
struct address_space *mapping = inode->i_mapping;
struct super_block *sb = inode->i_sb;
@ -2757,18 +2798,14 @@ void ext4_ext_truncate(struct inode * inode, struct page *page)
*/
err = ext4_writepage_trans_blocks(inode) + 3;
handle = ext4_journal_start(inode, err);
if (IS_ERR(handle)) {
if (page) {
clear_highpage(page);
flush_dcache_page(page);
unlock_page(page);
page_cache_release(page);
}
if (IS_ERR(handle))
return;
}
if (page)
ext4_block_truncate_page(handle, page, mapping, inode->i_size);
if (inode->i_size & (sb->s_blocksize - 1))
ext4_block_truncate_page(handle, mapping, inode->i_size);
if (ext4_orphan_add(handle, inode))
goto out_stop;
down_write(&EXT4_I(inode)->i_data_sem);
ext4_ext_invalidate_cache(inode);
@ -2780,8 +2817,6 @@ void ext4_ext_truncate(struct inode * inode, struct page *page)
* Probably we need not scan at all,
* because page truncation is enough.
*/
if (ext4_orphan_add(handle, inode))
goto out_stop;
/* we have to know where to truncate from in crash case */
EXT4_I(inode)->i_disksize = inode->i_size;
@ -2798,6 +2833,7 @@ void ext4_ext_truncate(struct inode * inode, struct page *page)
handle->h_sync = 1;
out_stop:
up_write(&EXT4_I(inode)->i_data_sem);
/*
* If this was a simple ftruncate() and the file will remain alive,
* then we need to clear up the orphan record which we created above.
@ -2808,7 +2844,6 @@ out_stop:
if (inode->i_nlink)
ext4_orphan_del(handle, inode);
up_write(&EXT4_I(inode)->i_data_sem);
inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
ext4_mark_inode_dirty(handle, inode);
ext4_journal_stop(handle);
@ -2911,7 +2946,7 @@ retry:
}
ret = ext4_get_blocks_wrap(handle, inode, block,
max_blocks, &map_bh,
EXT4_CREATE_UNINITIALIZED_EXT, 0);
EXT4_CREATE_UNINITIALIZED_EXT, 0, 0);
if (ret <= 0) {
#ifdef EXT4FS_DEBUG
WARN_ON(ret <= 0);

20
fs/ext4/file.c
View File

@ -123,6 +123,23 @@ force_commit:
return ret;
}
static struct vm_operations_struct ext4_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = ext4_page_mkwrite,
};
static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
{
struct address_space *mapping = file->f_mapping;
if (!mapping->a_ops->readpage)
return -ENOEXEC;
file_accessed(file);
vma->vm_ops = &ext4_file_vm_ops;
vma->vm_flags |= VM_CAN_NONLINEAR;
return 0;
}
const struct file_operations ext4_file_operations = {
.llseek = generic_file_llseek,
.read = do_sync_read,
@ -133,7 +150,7 @@ const struct file_operations ext4_file_operations = {
#ifdef CONFIG_COMPAT
.compat_ioctl = ext4_compat_ioctl,
#endif
.mmap = generic_file_mmap,
.mmap = ext4_file_mmap,
.open = generic_file_open,
.release = ext4_release_file,
.fsync = ext4_sync_file,
@ -144,6 +161,7 @@ const struct file_operations ext4_file_operations = {
const struct inode_operations ext4_file_inode_operations = {
.truncate = ext4_truncate,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
#ifdef CONFIG_EXT4DEV_FS_XATTR
.setxattr = generic_setxattr,
.getxattr = generic_getxattr,

4
fs/ext4/fsync.c
View File

@ -27,6 +27,7 @@
#include <linux/sched.h>
#include <linux/writeback.h>
#include <linux/jbd2.h>
#include <linux/blkdev.h>
#include "ext4.h"
#include "ext4_jbd2.h"
@ -45,6 +46,7 @@
int ext4_sync_file(struct file * file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
int ret = 0;
J_ASSERT(ext4_journal_current_handle() == NULL);
@ -85,6 +87,8 @@ int ext4_sync_file(struct file * file, struct dentry *dentry, int datasync)
.nr_to_write = 0, /* sys_fsync did this */
};
ret = sync_inode(inode, &wbc);
if (journal && (journal->j_flags & JBD2_BARRIER))
blkdev_issue_flush(inode->i_sb->s_bdev, NULL);
}
out:
return ret;

2
fs/ext4/group.h
View File

@ -13,7 +13,7 @@ extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
struct ext4_group_desc *gdp);
struct buffer_head *read_block_bitmap(struct super_block *sb,
struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
ext4_group_t block_group);
extern unsigned ext4_init_block_bitmap(struct super_block *sb,
struct buffer_head *bh,

113
fs/ext4/ialloc.c
View File

@ -157,6 +157,7 @@ void ext4_free_inode (handle_t *handle, struct inode * inode)
struct ext4_super_block * es;
struct ext4_sb_info *sbi;
int fatal = 0, err;
ext4_group_t flex_group;
if (atomic_read(&inode->i_count) > 1) {
printk ("ext4_free_inode: inode has count=%d\n",
@ -232,6 +233,12 @@ void ext4_free_inode (handle_t *handle, struct inode * inode)
if (is_directory)
percpu_counter_dec(&sbi->s_dirs_counter);
if (sbi->s_log_groups_per_flex) {
flex_group = ext4_flex_group(sbi, block_group);
spin_lock(sb_bgl_lock(sbi, flex_group));
sbi->s_flex_groups[flex_group].free_inodes++;
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
}
BUFFER_TRACE(bh2, "call ext4_journal_dirty_metadata");
err = ext4_journal_dirty_metadata(handle, bh2);
@ -286,6 +293,80 @@ static int find_group_dir(struct super_block *sb, struct inode *parent,
return ret;
}
#define free_block_ratio 10
static int find_group_flex(struct super_block *sb, struct inode *parent,
ext4_group_t *best_group)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_desc *desc;
struct buffer_head *bh;
struct flex_groups *flex_group = sbi->s_flex_groups;
ext4_group_t parent_group = EXT4_I(parent)->i_block_group;
ext4_group_t parent_fbg_group = ext4_flex_group(sbi, parent_group);
ext4_group_t ngroups = sbi->s_groups_count;
int flex_size = ext4_flex_bg_size(sbi);
ext4_group_t best_flex = parent_fbg_group;
int blocks_per_flex = sbi->s_blocks_per_group * flex_size;
int flexbg_free_blocks;
int flex_freeb_ratio;
ext4_group_t n_fbg_groups;
ext4_group_t i;
n_fbg_groups = (sbi->s_groups_count + flex_size - 1) >>
sbi->s_log_groups_per_flex;
find_close_to_parent:
flexbg_free_blocks = flex_group[best_flex].free_blocks;
flex_freeb_ratio = flexbg_free_blocks * 100 / blocks_per_flex;
if (flex_group[best_flex].free_inodes &&
flex_freeb_ratio > free_block_ratio)
goto found_flexbg;
if (best_flex && best_flex == parent_fbg_group) {
best_flex--;
goto find_close_to_parent;
}
for (i = 0; i < n_fbg_groups; i++) {
if (i == parent_fbg_group || i == parent_fbg_group - 1)
continue;
flexbg_free_blocks = flex_group[i].free_blocks;
flex_freeb_ratio = flexbg_free_blocks * 100 / blocks_per_flex;
if (flex_freeb_ratio > free_block_ratio &&
flex_group[i].free_inodes) {
best_flex = i;
goto found_flexbg;
}
if (best_flex < 0 ||
(flex_group[i].free_blocks >
flex_group[best_flex].free_blocks &&
flex_group[i].free_inodes))
best_flex = i;
}
if (!flex_group[best_flex].free_inodes ||
!flex_group[best_flex].free_blocks)
return -1;
found_flexbg:
for (i = best_flex * flex_size; i < ngroups &&
i < (best_flex + 1) * flex_size; i++) {
desc = ext4_get_group_desc(sb, i, &bh);
if (le16_to_cpu(desc->bg_free_inodes_count)) {
*best_group = i;
goto out;
}
}
return -1;
out:
return 0;
}
/*
* Orlov's allocator for directories.
*
@ -501,6 +582,7 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
struct inode *ret;
ext4_group_t i;
int free = 0;
ext4_group_t flex_group;
/* Cannot create files in a deleted directory */
if (!dir || !dir->i_nlink)
@ -514,6 +596,12 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
sbi = EXT4_SB(sb);
es = sbi->s_es;
if (sbi->s_log_groups_per_flex) {
ret2 = find_group_flex(sb, dir, &group);
goto got_group;
}
if (S_ISDIR(mode)) {
if (test_opt (sb, OLDALLOC))
ret2 = find_group_dir(sb, dir, &group);
@ -522,6 +610,7 @@ struct inode *ext4_new_inode(handle_t *handle, struct inode * dir, int mode)
} else
ret2 = find_group_other(sb, dir, &group);
got_group:
err = -ENOSPC;
if (ret2 == -1)
goto out;
@ -600,7 +689,7 @@ got:
/* We may have to initialize the block bitmap if it isn't already */
if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_GDT_CSUM) &&
gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
struct buffer_head *block_bh = read_block_bitmap(sb, group);
struct buffer_head *block_bh = ext4_read_block_bitmap(sb, group);
BUFFER_TRACE(block_bh, "get block bitmap access");
err = ext4_journal_get_write_access(handle, block_bh);
@ -676,6 +765,13 @@ got:
percpu_counter_inc(&sbi->s_dirs_counter);
sb->s_dirt = 1;
if (sbi->s_log_groups_per_flex) {
flex_group = ext4_flex_group(sbi, group);
spin_lock(sb_bgl_lock(sbi, flex_group));
sbi->s_flex_groups[flex_group].free_inodes--;
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
inode->i_uid = current->fsuid;
if (test_opt (sb, GRPID))
inode->i_gid = dir->i_gid;
@ -740,14 +836,10 @@ got:
goto fail_free_drop;
if (test_opt(sb, EXTENTS)) {
/* set extent flag only for diretory, file and normal symlink*/
/* set extent flag only for directory, file and normal symlink*/
if (S_ISDIR(mode) || S_ISREG(mode) || S_ISLNK(mode)) {
EXT4_I(inode)->i_flags |= EXT4_EXTENTS_FL;
ext4_ext_tree_init(handle, inode);
err = ext4_update_incompat_feature(handle, sb,
EXT4_FEATURE_INCOMPAT_EXTENTS);
if (err)
goto fail_free_drop;
}
}
@ -817,6 +909,14 @@ struct inode *ext4_orphan_get(struct super_block *sb, unsigned long ino)
if (IS_ERR(inode))
goto iget_failed;
/*
* If the orphans has i_nlinks > 0 then it should be able to be
* truncated, otherwise it won't be removed from the orphan list
* during processing and an infinite loop will result.
*/
if (inode->i_nlink && !ext4_can_truncate(inode))
goto bad_orphan;
if (NEXT_ORPHAN(inode) > max_ino)
goto bad_orphan;
brelse(bitmap_bh);
@ -838,6 +938,7 @@ bad_orphan:
printk(KERN_NOTICE "NEXT_ORPHAN(inode)=%u\n",
NEXT_ORPHAN(inode));
printk(KERN_NOTICE "max_ino=%lu\n", max_ino);
printk(KERN_NOTICE "i_nlink=%u\n", inode->i_nlink);
/* Avoid freeing blocks if we got a bad deleted inode */
if (inode->i_nlink == 0)
inode->i_blocks = 0;

1607
fs/ext4/inode.c
View File

File diff suppressed because it is too large Load Diff

451
fs/ext4/mballoc.c
View File

@ -381,22 +381,28 @@ static inline void mb_clear_bit_atomic(spinlock_t *lock, int bit, void *addr)
static inline int mb_find_next_zero_bit(void *addr, int max, int start)
{
int fix = 0;
int fix = 0, ret, tmpmax;
addr = mb_correct_addr_and_bit(&fix, addr);
max += fix;
tmpmax = max + fix;
start += fix;
return ext4_find_next_zero_bit(addr, max, start) - fix;
ret = ext4_find_next_zero_bit(addr, tmpmax, start) - fix;
if (ret > max)
return max;
return ret;
}
static inline int mb_find_next_bit(void *addr, int max, int start)
{
int fix = 0;
int fix = 0, ret, tmpmax;
addr = mb_correct_addr_and_bit(&fix, addr);
max += fix;
tmpmax = max + fix;
start += fix;
return ext4_find_next_bit(addr, max, start) - fix;
ret = ext4_find_next_bit(addr, tmpmax, start) - fix;
if (ret > max)
return max;
return ret;
}
static void *mb_find_buddy(struct ext4_buddy *e4b, int order, int *max)
@ -803,6 +809,7 @@ static int ext4_mb_init_cache(struct page *page, char *incore)
if (!buffer_uptodate(bh[i]))
goto out;
err = 0;
first_block = page->index * blocks_per_page;
for (i = 0; i < blocks_per_page; i++) {
int group;
@ -883,6 +890,7 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
int pnum;
int poff;
struct page *page;
int ret;
mb_debug("load group %lu\n", group);
@ -914,15 +922,21 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
if (page) {
BUG_ON(page->mapping != inode->i_mapping);
if (!PageUptodate(page)) {
ext4_mb_init_cache(page, NULL);
ret = ext4_mb_init_cache(page, NULL);
if (ret) {
unlock_page(page);
goto err;
}
mb_cmp_bitmaps(e4b, page_address(page) +
(poff * sb->s_blocksize));
}
unlock_page(page);
}
}
if (page == NULL || !PageUptodate(page))
if (page == NULL || !PageUptodate(page)) {
ret = -EIO;
goto err;
}
e4b->bd_bitmap_page = page;
e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize);
mark_page_accessed(page);
@ -938,14 +952,20 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
if (page) {
BUG_ON(page->mapping != inode->i_mapping);
if (!PageUptodate(page))
ext4_mb_init_cache(page, e4b->bd_bitmap);
if (!PageUptodate(page)) {
ret = ext4_mb_init_cache(page, e4b->bd_bitmap);
if (ret) {
unlock_page(page);
goto err;
}
}
unlock_page(page);
}
}
if (page == NULL || !PageUptodate(page))
if (page == NULL || !PageUptodate(page)) {
ret = -EIO;
goto err;
}
e4b->bd_buddy_page = page;
e4b->bd_buddy = page_address(page) + (poff * sb->s_blocksize);
mark_page_accessed(page);
@ -962,7 +982,7 @@ err:
page_cache_release(e4b->bd_buddy_page);
e4b->bd_buddy = NULL;
e4b->bd_bitmap = NULL;
return -EIO;
return ret;
}
static void ext4_mb_release_desc(struct ext4_buddy *e4b)
@ -1031,7 +1051,7 @@ static void mb_set_bits(spinlock_t *lock, void *bm, int cur, int len)
}
}
static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
static void mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
int first, int count)
{
int block = 0;
@ -1071,11 +1091,12 @@ static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
blocknr += block;
blocknr +=
le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
ext4_unlock_group(sb, e4b->bd_group);
ext4_error(sb, __func__, "double-free of inode"
" %lu's block %llu(bit %u in group %lu)\n",
inode ? inode->i_ino : 0, blocknr, block,
e4b->bd_group);
ext4_lock_group(sb, e4b->bd_group);
}
mb_clear_bit(block, EXT4_MB_BITMAP(e4b));
e4b->bd_info->bb_counters[order]++;
@ -1113,8 +1134,6 @@ static int mb_free_blocks(struct inode *inode, struct ext4_buddy *e4b,
} while (1);
}
mb_check_buddy(e4b);
return 0;
}
static int mb_find_extent(struct ext4_buddy *e4b, int order, int block,
@ -1730,10 +1749,6 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
ac->ac_g_ex.fe_start = sbi->s_mb_last_start;
spin_unlock(&sbi->s_md_lock);
}
/* searching for the right group start from the goal value specified */
group = ac->ac_g_ex.fe_group;
/* Let's just scan groups to find more-less suitable blocks */
cr = ac->ac_2order ? 0 : 1;
/*
@ -1743,6 +1758,12 @@ ext4_mb_regular_allocator(struct ext4_allocation_context *ac)
repeat:
for (; cr < 4 && ac->ac_status == AC_STATUS_CONTINUE; cr++) {
ac->ac_criteria = cr;
/*
* searching for the right group start
* from the goal value specified
*/
group = ac->ac_g_ex.fe_group;
for (i = 0; i < EXT4_SB(sb)->s_groups_count; group++, i++) {
struct ext4_group_info *grp;
struct ext4_group_desc *desc;
@ -1963,6 +1984,8 @@ static int ext4_mb_seq_history_open(struct inode *inode, struct file *file)
int rc;
int size;
if (unlikely(sbi->s_mb_history == NULL))
return -ENOMEM;
s = kmalloc(sizeof(*s), GFP_KERNEL);
if (s == NULL)
return -ENOMEM;
@ -2165,9 +2188,7 @@ static void ext4_mb_history_init(struct super_block *sb)
sbi->s_mb_history_cur = 0;
spin_lock_init(&sbi->s_mb_history_lock);
i = sbi->s_mb_history_max * sizeof(struct ext4_mb_history);
sbi->s_mb_history = kmalloc(i, GFP_KERNEL);
if (likely(sbi->s_mb_history != NULL))
memset(sbi->s_mb_history, 0, i);
sbi->s_mb_history = kzalloc(i, GFP_KERNEL);
/* if we can't allocate history, then we simple won't use it */
}
@ -2215,21 +2236,192 @@ ext4_mb_store_history(struct ext4_allocation_context *ac)
#define ext4_mb_history_init(sb)
#endif
/* Create and initialize ext4_group_info data for the given group. */
int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *desc)
{
int i, len;
int metalen = 0;
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_info **meta_group_info;
/*
* First check if this group is the first of a reserved block.
* If it's true, we have to allocate a new table of pointers
* to ext4_group_info structures
*/
if (group % EXT4_DESC_PER_BLOCK(sb) == 0) {
metalen = sizeof(*meta_group_info) <<
EXT4_DESC_PER_BLOCK_BITS(sb);
meta_group_info = kmalloc(metalen, GFP_KERNEL);
if (meta_group_info == NULL) {
printk(KERN_ERR "EXT4-fs: can't allocate mem for a "
"buddy group\n");
goto exit_meta_group_info;
}
sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)] =
meta_group_info;
}
/*
* calculate needed size. if change bb_counters size,
* don't forget about ext4_mb_generate_buddy()
*/
len = offsetof(typeof(**meta_group_info),
bb_counters[sb->s_blocksize_bits + 2]);
meta_group_info =
sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)];
i = group & (EXT4_DESC_PER_BLOCK(sb) - 1);
meta_group_info[i] = kzalloc(len, GFP_KERNEL);
if (meta_group_info[i] == NULL) {
printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
goto exit_group_info;
}
set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
&(meta_group_info[i]->bb_state));
/*
* initialize bb_free to be able to skip
* empty groups without initialization
*/
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
meta_group_info[i]->bb_free =
ext4_free_blocks_after_init(sb, group, desc);
} else {
meta_group_info[i]->bb_free =
le16_to_cpu(desc->bg_free_blocks_count);
}
INIT_LIST_HEAD(&meta_group_info[i]->bb_prealloc_list);
#ifdef DOUBLE_CHECK
{
struct buffer_head *bh;
meta_group_info[i]->bb_bitmap =
kmalloc(sb->s_blocksize, GFP_KERNEL);
BUG_ON(meta_group_info[i]->bb_bitmap == NULL);
bh = ext4_read_block_bitmap(sb, group);
BUG_ON(bh == NULL);
memcpy(meta_group_info[i]->bb_bitmap, bh->b_data,
sb->s_blocksize);
put_bh(bh);
}
#endif
return 0;
exit_group_info:
/* If a meta_group_info table has been allocated, release it now */
if (group % EXT4_DESC_PER_BLOCK(sb) == 0)
kfree(sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)]);
exit_meta_group_info:
return -ENOMEM;
} /* ext4_mb_add_groupinfo */
/*
* Add a group to the existing groups.
* This function is used for online resize
*/
int ext4_mb_add_more_groupinfo(struct super_block *sb, ext4_group_t group,
struct ext4_group_desc *desc)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct inode *inode = sbi->s_buddy_cache;
int blocks_per_page;
int block;
int pnum;
struct page *page;
int err;
/* Add group based on group descriptor*/
err = ext4_mb_add_groupinfo(sb, group, desc);
if (err)
return err;
/*
* Cache pages containing dynamic mb_alloc datas (buddy and bitmap
* datas) are set not up to date so that they will be re-initilaized
* during the next call to ext4_mb_load_buddy
*/
/* Set buddy page as not up to date */
blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
block = group * 2;
pnum = block / blocks_per_page;
page = find_get_page(inode->i_mapping, pnum);
if (page != NULL) {
ClearPageUptodate(page);
page_cache_release(page);
}
/* Set bitmap page as not up to date */
block++;
pnum = block / blocks_per_page;
page = find_get_page(inode->i_mapping, pnum);
if (page != NULL) {
ClearPageUptodate(page);
page_cache_release(page);
}
return 0;
}
/*
* Update an existing group.
* This function is used for online resize
*/
void ext4_mb_update_group_info(struct ext4_group_info *grp, ext4_grpblk_t add)
{
grp->bb_free += add;
}
static int ext4_mb_init_backend(struct super_block *sb)
{
ext4_group_t i;
int j, len, metalen;
int metalen;
struct ext4_sb_info *sbi = EXT4_SB(sb);
int num_meta_group_infos =
(sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) >>
EXT4_DESC_PER_BLOCK_BITS(sb);
struct ext4_super_block *es = sbi->s_es;
int num_meta_group_infos;
int num_meta_group_infos_max;
int array_size;
struct ext4_group_info **meta_group_info;
struct ext4_group_desc *desc;
/* This is the number of blocks used by GDT */
num_meta_group_infos = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) -
1) >> EXT4_DESC_PER_BLOCK_BITS(sb);
/*
* This is the total number of blocks used by GDT including
* the number of reserved blocks for GDT.
* The s_group_info array is allocated with this value
* to allow a clean online resize without a complex
* manipulation of pointer.
* The drawback is the unused memory when no resize
* occurs but it's very low in terms of pages
* (see comments below)
* Need to handle this properly when META_BG resizing is allowed
*/
num_meta_group_infos_max = num_meta_group_infos +
le16_to_cpu(es->s_reserved_gdt_blocks);
/*
* array_size is the size of s_group_info array. We round it
* to the next power of two because this approximation is done
* internally by kmalloc so we can have some more memory
* for free here (e.g. may be used for META_BG resize).
*/
array_size = 1;
while (array_size < sizeof(*sbi->s_group_info) *
num_meta_group_infos_max)
array_size = array_size << 1;
/* An 8TB filesystem with 64-bit pointers requires a 4096 byte
* kmalloc. A 128kb malloc should suffice for a 256TB filesystem.
* So a two level scheme suffices for now. */
sbi->s_group_info = kmalloc(sizeof(*sbi->s_group_info) *
num_meta_group_infos, GFP_KERNEL);
sbi->s_group_info = kmalloc(array_size, GFP_KERNEL);
if (sbi->s_group_info == NULL) {
printk(KERN_ERR "EXT4-fs: can't allocate buddy meta group\n");
return -ENOMEM;
@ -2256,63 +2448,15 @@ static int ext4_mb_init_backend(struct super_block *sb)
sbi->s_group_info[i] = meta_group_info;
}
/*
* calculate needed size. if change bb_counters size,
* don't forget about ext4_mb_generate_buddy()
*/
len = sizeof(struct ext4_group_info);
len += sizeof(unsigned short) * (sb->s_blocksize_bits + 2);
for (i = 0; i < sbi->s_groups_count; i++) {
struct ext4_group_desc *desc;
meta_group_info =
sbi->s_group_info[i >> EXT4_DESC_PER_BLOCK_BITS(sb)];
j = i & (EXT4_DESC_PER_BLOCK(sb) - 1);
meta_group_info[j] = kzalloc(len, GFP_KERNEL);
if (meta_group_info[j] == NULL) {
printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
goto err_freebuddy;
}
desc = ext4_get_group_desc(sb, i, NULL);
if (desc == NULL) {
printk(KERN_ERR
"EXT4-fs: can't read descriptor %lu\n", i);
i++;
goto err_freebuddy;
}
memset(meta_group_info[j], 0, len);
set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
&(meta_group_info[j]->bb_state));
/*
* initialize bb_free to be able to skip
* empty groups without initialization
*/
if (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT)) {
meta_group_info[j]->bb_free =
ext4_free_blocks_after_init(sb, i, desc);
} else {
meta_group_info[j]->bb_free =
le16_to_cpu(desc->bg_free_blocks_count);
}
INIT_LIST_HEAD(&meta_group_info[j]->bb_prealloc_list);
#ifdef DOUBLE_CHECK
{
struct buffer_head *bh;
meta_group_info[j]->bb_bitmap =
kmalloc(sb->s_blocksize, GFP_KERNEL);
BUG_ON(meta_group_info[j]->bb_bitmap == NULL);
bh = read_block_bitmap(sb, i);
BUG_ON(bh == NULL);
memcpy(meta_group_info[j]->bb_bitmap, bh->b_data,
sb->s_blocksize);
put_bh(bh);
}
#endif
if (ext4_mb_add_groupinfo(sb, i, desc) != 0)
goto err_freebuddy;
}
return 0;
@ -2336,6 +2480,7 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
unsigned i;
unsigned offset;
unsigned max;
int ret;
if (!test_opt(sb, MBALLOC))
return 0;
@ -2370,12 +2515,12 @@ int ext4_mb_init(struct super_block *sb, int needs_recovery)
} while (i <= sb->s_blocksize_bits + 1);
/* init file for buddy data */
i = ext4_mb_init_backend(sb);
if (i) {
ret = ext4_mb_init_backend(sb);
if (ret != 0) {
clear_opt(sbi->s_mount_opt, MBALLOC);
kfree(sbi->s_mb_offsets);
kfree(sbi->s_mb_maxs);
return i;
return ret;
}
spin_lock_init(&sbi->s_md_lock);
@ -2548,8 +2693,7 @@ ext4_mb_free_committed_blocks(struct super_block *sb)
ext4_lock_group(sb, md->group);
for (i = 0; i < md->num; i++) {
mb_debug(" %u", md->blocks[i]);
err = mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
BUG_ON(err != 0);
mb_free_blocks(NULL, &e4b, md->blocks[i], 1);
}
mb_debug("\n");
ext4_unlock_group(sb, md->group);
@ -2575,25 +2719,24 @@ ext4_mb_free_committed_blocks(struct super_block *sb)
#define MB_PROC_VALUE_READ(name) \
static int ext4_mb_read_##name(char *page, char **start, \
off_t off, int count, int *eof, void *data) \
#define MB_PROC_FOPS(name) \
static int ext4_mb_##name##_proc_show(struct seq_file *m, void *v) \
{ \
struct ext4_sb_info *sbi = data; \
int len; \
*eof = 1; \
if (off != 0) \
return 0; \
len = sprintf(page, "%ld\n", sbi->s_mb_##name); \
*start = page; \
return len; \
}
#define MB_PROC_VALUE_WRITE(name) \
static int ext4_mb_write_##name(struct file *file, \
const char __user *buf, unsigned long cnt, void *data) \
struct ext4_sb_info *sbi = m->private; \
\
seq_printf(m, "%ld\n", sbi->s_mb_##name); \
return 0; \
} \
\
static int ext4_mb_##name##_proc_open(struct inode *inode, struct file *file)\
{ \
struct ext4_sb_info *sbi = data; \
return single_open(file, ext4_mb_##name##_proc_show, PDE(inode)->data);\
} \
\
static ssize_t ext4_mb_##name##_proc_write(struct file *file, \
const char __user *buf, size_t cnt, loff_t *ppos) \
{ \
struct ext4_sb_info *sbi = PDE(file->f_path.dentry->d_inode)->data;\
char str[32]; \
long value; \
if (cnt >= sizeof(str)) \
@ -2605,31 +2748,32 @@ static int ext4_mb_write_##name(struct file *file, \
return -ERANGE; \
sbi->s_mb_##name = value; \
return cnt; \
}
} \
\
static const struct file_operations ext4_mb_##name##_proc_fops = { \
.owner = THIS_MODULE, \
.open = ext4_mb_##name##_proc_open, \
.read = seq_read, \
.llseek = seq_lseek, \
.release = single_release, \
.write = ext4_mb_##name##_proc_write, \
};
MB_PROC_VALUE_READ(stats);
MB_PROC_VALUE_WRITE(stats);
MB_PROC_VALUE_READ(max_to_scan);
MB_PROC_VALUE_WRITE(max_to_scan);
MB_PROC_VALUE_READ(min_to_scan);
MB_PROC_VALUE_WRITE(min_to_scan);
MB_PROC_VALUE_READ(order2_reqs);
MB_PROC_VALUE_WRITE(order2_reqs);
MB_PROC_VALUE_READ(stream_request);
MB_PROC_VALUE_WRITE(stream_request);
MB_PROC_VALUE_READ(group_prealloc);
MB_PROC_VALUE_WRITE(group_prealloc);
MB_PROC_FOPS(stats);
MB_PROC_FOPS(max_to_scan);
MB_PROC_FOPS(min_to_scan);
MB_PROC_FOPS(order2_reqs);
MB_PROC_FOPS(stream_request);
MB_PROC_FOPS(group_prealloc);
#define MB_PROC_HANDLER(name, var) \
do { \
proc = create_proc_entry(name, mode, sbi->s_mb_proc); \
proc = proc_create_data(name, mode, sbi->s_mb_proc, \
&ext4_mb_##var##_proc_fops, sbi); \
if (proc == NULL) { \
printk(KERN_ERR "EXT4-fs: can't to create %s\n", name); \
goto err_out; \
} \
proc->data = sbi; \
proc->read_proc = ext4_mb_read_##var ; \
proc->write_proc = ext4_mb_write_##var; \
} while (0)
static int ext4_mb_init_per_dev_proc(struct super_block *sb)
@ -2639,6 +2783,10 @@ static int ext4_mb_init_per_dev_proc(struct super_block *sb)
struct proc_dir_entry *proc;
char devname[64];
if (proc_root_ext4 == NULL) {
sbi->s_mb_proc = NULL;
return -EINVAL;
}
bdevname(sb->s_bdev, devname);
sbi->s_mb_proc = proc_mkdir(devname, proc_root_ext4);
@ -2747,7 +2895,7 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
err = -EIO;
bitmap_bh = read_block_bitmap(sb, ac->ac_b_ex.fe_group);
bitmap_bh = ext4_read_block_bitmap(sb, ac->ac_b_ex.fe_group);
if (!bitmap_bh)
goto out_err;
@ -2816,7 +2964,23 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
le16_add_cpu(&gdp->bg_free_blocks_count, -ac->ac_b_ex.fe_len);
gdp->bg_checksum = ext4_group_desc_csum(sbi, ac->ac_b_ex.fe_group, gdp);
spin_unlock(sb_bgl_lock(sbi, ac->ac_b_ex.fe_group));
percpu_counter_sub(&sbi->s_freeblocks_counter, ac->ac_b_ex.fe_len);
/*
* free blocks account has already be reduced/reserved
* at write_begin() time for delayed allocation
* do not double accounting
*/
if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED))
percpu_counter_sub(&sbi->s_freeblocks_counter,
ac->ac_b_ex.fe_len);
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi,
ac->ac_b_ex.fe_group);
spin_lock(sb_bgl_lock(sbi, flex_group));
sbi->s_flex_groups[flex_group].free_blocks -= ac->ac_b_ex.fe_len;
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
err = ext4_journal_dirty_metadata(handle, bitmap_bh);
if (err)
@ -3473,8 +3637,6 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh,
if (bit >= end)
break;
next = mb_find_next_bit(bitmap_bh->b_data, end, bit);
if (next > end)
next = end;
start = group * EXT4_BLOCKS_PER_GROUP(sb) + bit +
le32_to_cpu(sbi->s_es->s_first_data_block);
mb_debug(" free preallocated %u/%u in group %u\n",
@ -3569,7 +3731,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
if (list_empty(&grp->bb_prealloc_list))
return 0;
bitmap_bh = read_block_bitmap(sb, group);
bitmap_bh = ext4_read_block_bitmap(sb, group);
if (bitmap_bh == NULL) {
/* error handling here */
ext4_mb_release_desc(&e4b);
@ -3743,7 +3905,7 @@ repeat:
err = ext4_mb_load_buddy(sb, group, &e4b);
BUG_ON(err != 0); /* error handling here */
bitmap_bh = read_block_bitmap(sb, group);
bitmap_bh = ext4_read_block_bitmap(sb, group);
if (bitmap_bh == NULL) {
/* error handling here */
ext4_mb_release_desc(&e4b);
@ -4011,10 +4173,21 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
sbi = EXT4_SB(sb);
if (!test_opt(sb, MBALLOC)) {
block = ext4_new_blocks_old(handle, ar->inode, ar->goal,
block = ext4_old_new_blocks(handle, ar->inode, ar->goal,
&(ar->len), errp);
return block;
}
if (!EXT4_I(ar->inode)->i_delalloc_reserved_flag) {
/*
* With delalloc we already reserved the blocks
*/
ar->len = ext4_has_free_blocks(sbi, ar->len);
}
if (ar->len == 0) {
*errp = -ENOSPC;
return 0;
}
while (ar->len && DQUOT_ALLOC_BLOCK(ar->inode, ar->len)) {
ar->flags |= EXT4_MB_HINT_NOPREALLOC;
@ -4026,10 +4199,14 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
}
inquota = ar->len;
if (EXT4_I(ar->inode)->i_delalloc_reserved_flag)
ar->flags |= EXT4_MB_DELALLOC_RESERVED;
ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS);
if (!ac) {
ar->len = 0;
*errp = -ENOMEM;
return 0;
goto out1;
}
ext4_mb_poll_new_transaction(sb, handle);
@ -4037,12 +4214,11 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
*errp = ext4_mb_initialize_context(ac, ar);
if (*errp) {
ar->len = 0;
goto out;
goto out2;
}
ac->ac_op = EXT4_MB_HISTORY_PREALLOC;
if (!ext4_mb_use_preallocated(ac)) {
ac->ac_op = EXT4_MB_HISTORY_ALLOC;
ext4_mb_normalize_request(ac, ar);
repeat:
@ -4085,11 +4261,12 @@ repeat:
ext4_mb_release_context(ac);
out:
out2:
kmem_cache_free(ext4_ac_cachep, ac);
out1:
if (ar->len < inquota)
DQUOT_FREE_BLOCK(ar->inode, inquota - ar->len);
kmem_cache_free(ext4_ac_cachep, ac);
return block;
}
static void ext4_mb_poll_new_transaction(struct super_block *sb,
@ -4242,7 +4419,7 @@ do_more:
overflow = bit + count - EXT4_BLOCKS_PER_GROUP(sb);
count -= overflow;
}
bitmap_bh = read_block_bitmap(sb, block_group);
bitmap_bh = ext4_read_block_bitmap(sb, block_group);
if (!bitmap_bh)
goto error_return;
gdp = ext4_get_group_desc(sb, block_group, &gd_bh);
@ -4309,10 +4486,9 @@ do_more:
ext4_mb_free_metadata(handle, &e4b, block_group, bit, count);
} else {
ext4_lock_group(sb, block_group);
err = mb_free_blocks(inode, &e4b, bit, count);
mb_free_blocks(inode, &e4b, bit, count);
ext4_mb_return_to_preallocation(inode, &e4b, block, count);
ext4_unlock_group(sb, block_group);
BUG_ON(err != 0);
}
spin_lock(sb_bgl_lock(sbi, block_group));
@ -4321,6 +4497,13 @@ do_more:
spin_unlock(sb_bgl_lock(sbi, block_group));
percpu_counter_add(&sbi->s_freeblocks_counter, count);
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
spin_lock(sb_bgl_lock(sbi, flex_group));
sbi->s_flex_groups[flex_group].free_blocks += count;
spin_unlock(sb_bgl_lock(sbi, flex_group));
}
ext4_mb_release_desc(&e4b);
*freed += count;

45
fs/ext4/namei.c
View File

@ -182,6 +182,16 @@ static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
struct inode *inode);
/*
* p is at least 6 bytes before the end of page
*/
static inline struct ext4_dir_entry_2 *
ext4_next_entry(struct ext4_dir_entry_2 *p)
{
return (struct ext4_dir_entry_2 *)((char *)p +
ext4_rec_len_from_disk(p->rec_len));
}
/*
* Future: use high four bits of block for coalesce-on-delete flags
* Mask them off for now.
@ -231,13 +241,13 @@ static inline unsigned dx_root_limit (struct inode *dir, unsigned infosize)
{
unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(1) -
EXT4_DIR_REC_LEN(2) - infosize;
return 0? 20: entry_space / sizeof(struct dx_entry);
return entry_space / sizeof(struct dx_entry);
}
static inline unsigned dx_node_limit (struct inode *dir)
{
unsigned entry_space = dir->i_sb->s_blocksize - EXT4_DIR_REC_LEN(0);
return 0? 22: entry_space / sizeof(struct dx_entry);
return entry_space / sizeof(struct dx_entry);
}
/*
@ -553,15 +563,6 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
}
/*
* p is at least 6 bytes before the end of page
*/
static inline struct ext4_dir_entry_2 *ext4_next_entry(struct ext4_dir_entry_2 *p)
{
return (struct ext4_dir_entry_2 *)((char *)p +
ext4_rec_len_from_disk(p->rec_len));
}
/*
* This function fills a red-black tree with information from a
* directory block. It returns the number directory entries loaded
@ -993,19 +994,21 @@ static struct buffer_head * ext4_dx_find_entry(struct dentry *dentry,
de = (struct ext4_dir_entry_2 *) bh->b_data;
top = (struct ext4_dir_entry_2 *) ((char *) de + sb->s_blocksize -
EXT4_DIR_REC_LEN(0));
for (; de < top; de = ext4_next_entry(de))
if (ext4_match (namelen, name, de)) {
if (!ext4_check_dir_entry("ext4_find_entry",
dir, de, bh,
(block<<EXT4_BLOCK_SIZE_BITS(sb))
+((char *)de - bh->b_data))) {
brelse (bh);
for (; de < top; de = ext4_next_entry(de)) {
int off = (block << EXT4_BLOCK_SIZE_BITS(sb))
+ ((char *) de - bh->b_data);
if (!ext4_check_dir_entry(__func__, dir, de, bh, off)) {
brelse(bh);
*err = ERR_BAD_DX_DIR;
goto errout;
}
*res_dir = de;
dx_release (frames);
return bh;
if (ext4_match(namelen, name, de)) {
*res_dir = de;
dx_release(frames);
return bh;
}
}
brelse (bh);
/* Check to see if we should continue to search */

52
fs/ext4/resize.c
View File

@ -865,6 +865,15 @@ int ext4_group_add(struct super_block *sb, struct ext4_new_group_data *input)
gdp->bg_free_inodes_count = cpu_to_le16(EXT4_INODES_PER_GROUP(sb));
gdp->bg_checksum = ext4_group_desc_csum(sbi, input->group, gdp);
/*
* We can allocate memory for mb_alloc based on the new group
* descriptor
*/
if (test_opt(sb, MBALLOC)) {
err = ext4_mb_add_more_groupinfo(sb, input->group, gdp);
if (err)
goto exit_journal;
}
/*
* Make the new blocks and inodes valid next. We do this before
* increasing the group count so that once the group is enabled,
@ -957,6 +966,8 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
handle_t *handle;
int err;
unsigned long freed_blocks;
ext4_group_t group;
struct ext4_group_info *grp;
/* We don't need to worry about locking wrt other resizers just
* yet: we're going to revalidate es->s_blocks_count after
@ -988,7 +999,7 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
}
/* Handle the remaining blocks in the last group only. */
ext4_get_group_no_and_offset(sb, o_blocks_count, NULL, &last);
ext4_get_group_no_and_offset(sb, o_blocks_count, &group, &last);
if (last == 0) {
ext4_warning(sb, __func__,
@ -1060,6 +1071,45 @@ int ext4_group_extend(struct super_block *sb, struct ext4_super_block *es,
o_blocks_count + add);
if ((err = ext4_journal_stop(handle)))
goto exit_put;
/*
* Mark mballoc pages as not up to date so that they will be updated
* next time they are loaded by ext4_mb_load_buddy.
*/
if (test_opt(sb, MBALLOC)) {
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct inode *inode = sbi->s_buddy_cache;
int blocks_per_page;
int block;
int pnum;
struct page *page;
/* Set buddy page as not up to date */
blocks_per_page = PAGE_CACHE_SIZE / sb->s_blocksize;
block = group * 2;
pnum = block / blocks_per_page;
page = find_get_page(inode->i_mapping, pnum);
if (page != NULL) {
ClearPageUptodate(page);
page_cache_release(page);
}
/* Set bitmap page as not up to date */
block++;
pnum = block / blocks_per_page;
page = find_get_page(inode->i_mapping, pnum);
if (page != NULL) {
ClearPageUptodate(page);
page_cache_release(page);
}
/* Get the info on the last group */
grp = ext4_get_group_info(sb, group);
/* Update free blocks in group info */
ext4_mb_update_group_info(grp, add);
}
if (test_opt(sb, DEBUG))
printk(KERN_DEBUG "EXT4-fs: extended group to %llu blocks\n",
ext4_blocks_count(es));

142
fs/ext4/super.c
View File

@ -506,6 +506,7 @@ static void ext4_put_super (struct super_block * sb)
ext4_ext_release(sb);
ext4_xattr_put_super(sb);
jbd2_journal_destroy(sbi->s_journal);
sbi->s_journal = NULL;
if (!(sb->s_flags & MS_RDONLY)) {
EXT4_CLEAR_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER);
es->s_state = cpu_to_le16(sbi->s_mount_state);
@ -517,6 +518,7 @@ static void ext4_put_super (struct super_block * sb)
for (i = 0; i < sbi->s_gdb_count; i++)
brelse(sbi->s_group_desc[i]);
kfree(sbi->s_group_desc);
kfree(sbi->s_flex_groups);
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
percpu_counter_destroy(&sbi->s_dirs_counter);
@ -571,6 +573,12 @@ static struct inode *ext4_alloc_inode(struct super_block *sb)
memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));
INIT_LIST_HEAD(&ei->i_prealloc_list);
spin_lock_init(&ei->i_prealloc_lock);
jbd2_journal_init_jbd_inode(&ei->jinode, &ei->vfs_inode);
ei->i_reserved_data_blocks = 0;
ei->i_reserved_meta_blocks = 0;
ei->i_allocated_meta_blocks = 0;
ei->i_delalloc_reserved_flag = 0;
spin_lock_init(&(ei->i_block_reservation_lock));
return &ei->vfs_inode;
}
@ -635,6 +643,8 @@ static void ext4_clear_inode(struct inode *inode)
EXT4_I(inode)->i_block_alloc_info = NULL;
if (unlikely(rsv))
kfree(rsv);
jbd2_journal_release_jbd_inode(EXT4_SB(inode->i_sb)->s_journal,
&EXT4_I(inode)->jinode);
}
static inline void ext4_show_quota_options(struct seq_file *seq, struct super_block *sb)
@ -671,7 +681,6 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
unsigned long def_mount_opts;
struct super_block *sb = vfs->mnt_sb;
struct ext4_sb_info *sbi = EXT4_SB(sb);
journal_t *journal = sbi->s_journal;
struct ext4_super_block *es = sbi->s_es;
def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
@ -747,6 +756,9 @@ static int ext4_show_options(struct seq_file *seq, struct vfsmount *vfs)
seq_puts(seq, ",nomballoc");
if (test_opt(sb, I_VERSION))
seq_puts(seq, ",i_version");
if (!test_opt(sb, DELALLOC))
seq_puts(seq, ",nodelalloc");
if (sbi->s_stripe)
seq_printf(seq, ",stripe=%lu", sbi->s_stripe);
@ -894,7 +906,7 @@ enum {
Opt_jqfmt_vfsold, Opt_jqfmt_vfsv0, Opt_quota, Opt_noquota,
Opt_ignore, Opt_barrier, Opt_err, Opt_resize, Opt_usrquota,
Opt_grpquota, Opt_extents, Opt_noextents, Opt_i_version,
Opt_mballoc, Opt_nomballoc, Opt_stripe,
Opt_mballoc, Opt_nomballoc, Opt_stripe, Opt_delalloc, Opt_nodelalloc,
};
static match_table_t tokens = {
@ -953,6 +965,8 @@ static match_table_t tokens = {
{Opt_nomballoc, "nomballoc"},
{Opt_stripe, "stripe=%u"},
{Opt_resize, "resize"},
{Opt_delalloc, "delalloc"},
{Opt_nodelalloc, "nodelalloc"},
{Opt_err, NULL},
};
@ -990,6 +1004,7 @@ static int parse_options (char *options, struct super_block *sb,
int qtype, qfmt;
char *qname;
#endif
ext4_fsblk_t last_block;
if (!options)
return 1;
@ -1309,15 +1324,39 @@ set_qf_format:
clear_opt(sbi->s_mount_opt, NOBH);
break;
case Opt_extents:
if (!EXT4_HAS_INCOMPAT_FEATURE(sb,
EXT4_FEATURE_INCOMPAT_EXTENTS)) {
ext4_warning(sb, __func__,
"extents feature not enabled "
"on this filesystem, use tune2fs\n");
return 0;
}
set_opt (sbi->s_mount_opt, EXTENTS);
break;
case Opt_noextents:
/*
* When e2fsprogs support resizing an already existing
* ext3 file system to greater than 2**32 we need to
* add support to block allocator to handle growing
* already existing block mapped inode so that blocks
* allocated for them fall within 2**32
*/
last_block = ext4_blocks_count(sbi->s_es) - 1;
if (last_block > 0xffffffffULL) {
printk(KERN_ERR "EXT4-fs: Filesystem too "
"large to mount with "
"-o noextents options\n");
return 0;
}
clear_opt (sbi->s_mount_opt, EXTENTS);
break;
case Opt_i_version:
set_opt(sbi->s_mount_opt, I_VERSION);
sb->s_flags |= MS_I_VERSION;
break;
case Opt_nodelalloc:
clear_opt(sbi->s_mount_opt, DELALLOC);
break;
case Opt_mballoc:
set_opt(sbi->s_mount_opt, MBALLOC);
break;
@ -1331,6 +1370,9 @@ set_qf_format:
return 0;
sbi->s_stripe = option;
break;
case Opt_delalloc:
set_opt(sbi->s_mount_opt, DELALLOC);
break;
default:
printk (KERN_ERR
"EXT4-fs: Unrecognized mount option \"%s\" "
@ -1443,6 +1485,54 @@ static int ext4_setup_super(struct super_block *sb, struct ext4_super_block *es,
return res;
}
static int ext4_fill_flex_info(struct super_block *sb)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct ext4_group_desc *gdp = NULL;
struct buffer_head *bh;
ext4_group_t flex_group_count;
ext4_group_t flex_group;
int groups_per_flex = 0;
__u64 block_bitmap = 0;
int i;
if (!sbi->s_es->s_log_groups_per_flex) {
sbi->s_log_groups_per_flex = 0;
return 1;
}
sbi->s_log_groups_per_flex = sbi->s_es->s_log_groups_per_flex;
groups_per_flex = 1 << sbi->s_log_groups_per_flex;
flex_group_count = (sbi->s_groups_count + groups_per_flex - 1) /
groups_per_flex;
sbi->s_flex_groups = kmalloc(flex_group_count *
sizeof(struct flex_groups), GFP_KERNEL);
if (sbi->s_flex_groups == NULL) {
printk(KERN_ERR "EXT4-fs: not enough memory\n");
goto failed;
}
memset(sbi->s_flex_groups, 0, flex_group_count *
sizeof(struct flex_groups));
gdp = ext4_get_group_desc(sb, 1, &bh);
block_bitmap = ext4_block_bitmap(sb, gdp) - 1;
for (i = 0; i < sbi->s_groups_count; i++) {
gdp = ext4_get_group_desc(sb, i, &bh);
flex_group = ext4_flex_group(sbi, i);
sbi->s_flex_groups[flex_group].free_inodes +=
le16_to_cpu(gdp->bg_free_inodes_count);
sbi->s_flex_groups[flex_group].free_blocks +=
le16_to_cpu(gdp->bg_free_blocks_count);
}
return 1;
failed:
return 0;
}
__le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 block_group,
struct ext4_group_desc *gdp)
{
@ -1810,8 +1900,8 @@ static unsigned long ext4_get_stripe_size(struct ext4_sb_info *sbi)
}
static int ext4_fill_super (struct super_block *sb, void *data, int silent)
__releases(kernel_sem)
__acquires(kernel_sem)
__releases(kernel_lock)
__acquires(kernel_lock)
{
struct buffer_head * bh;
@ -1851,11 +1941,6 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
goto out_fail;
}
if (!sb_set_blocksize(sb, blocksize)) {
printk(KERN_ERR "EXT4-fs: bad blocksize %d.\n", blocksize);
goto out_fail;
}
/*
* The ext4 superblock will not be buffer aligned for other than 1kB
* block sizes. We need to calculate the offset from buffer start.
@ -1919,15 +2004,28 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
/*
* turn on extents feature by default in ext4 filesystem
* User -o noextents to turn it off
* only if feature flag already set by mkfs or tune2fs.
* Use -o noextents to turn it off
*/
set_opt(sbi->s_mount_opt, EXTENTS);
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_EXTENTS))
set_opt(sbi->s_mount_opt, EXTENTS);
else
ext4_warning(sb, __func__,
"extents feature not enabled on this filesystem, "
"use tune2fs.\n");
/*
* turn on mballoc feature by default in ext4 filesystem
* User -o nomballoc to turn it off
* turn on mballoc code by default in ext4 filesystem
* Use -o nomballoc to turn it off
*/
set_opt(sbi->s_mount_opt, MBALLOC);
/*
* enable delayed allocation by default
* Use -o nodelalloc to turn it off
*/
set_opt(sbi->s_mount_opt, DELALLOC);
if (!parse_options ((char *) data, sb, &journal_inum, &journal_devnum,
NULL, 0))
goto failed_mount;
@ -2138,6 +2236,14 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
printk(KERN_ERR "EXT4-fs: group descriptors corrupted!\n");
goto failed_mount2;
}
if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FLEX_BG))
if (!ext4_fill_flex_info(sb)) {
printk(KERN_ERR
"EXT4-fs: unable to initialize "
"flex_bg meta info!\n");
goto failed_mount2;
}
sbi->s_gdb_count = db_count;
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
spin_lock_init(&sbi->s_next_gen_lock);
@ -2358,6 +2464,13 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
test_opt(sb,DATA_FLAGS) == EXT4_MOUNT_ORDERED_DATA ? "ordered":
"writeback");
if (test_opt(sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA) {
printk(KERN_WARNING "EXT4-fs: Ignoring delalloc option - "
"requested data journaling mode\n");
clear_opt(sbi->s_mount_opt, DELALLOC);
} else if (test_opt(sb, DELALLOC))
printk(KERN_INFO "EXT4-fs: delayed allocation enabled\n");
ext4_ext_init(sb);
ext4_mb_init(sb, needs_recovery);
@ -2372,6 +2485,7 @@ cantfind_ext4:
failed_mount4:
jbd2_journal_destroy(sbi->s_journal);
sbi->s_journal = NULL;
failed_mount3:
percpu_counter_destroy(&sbi->s_freeblocks_counter);
percpu_counter_destroy(&sbi->s_freeinodes_counter);
@ -3325,7 +3439,7 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
err = ext4_journal_dirty_metadata(handle, bh);
else {
/* Always do at least ordered writes for quotas */
err = ext4_journal_dirty_data(handle, bh);
err = ext4_jbd2_file_inode(handle, inode);
mark_buffer_dirty(bh);
}
brelse(bh);

2
fs/ext4/xattr.c
View File

@ -810,7 +810,7 @@ inserted:
/* We need to allocate a new block */
ext4_fsblk_t goal = ext4_group_first_block_no(sb,
EXT4_I(inode)->i_block_group);
ext4_fsblk_t block = ext4_new_block(handle, inode,
ext4_fsblk_t block = ext4_new_meta_block(handle, inode,
goal, &error);
if (error)
goto cleanup;

4
fs/ext4/xattr_trusted.c
View File

@ -13,13 +13,11 @@
#include "ext4.h"
#include "xattr.h"
#define XATTR_TRUSTED_PREFIX "trusted."
static size_t
ext4_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
{
const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1;
const size_t prefix_len = XATTR_TRUSTED_PREFIX_LEN;
const size_t total_len = prefix_len + name_len + 1;
if (!capable(CAP_SYS_ADMIN))

4
fs/ext4/xattr_user.c
View File

@ -12,13 +12,11 @@
#include "ext4.h"
#include "xattr.h"
#define XATTR_USER_PREFIX "user."
static size_t
ext4_xattr_user_list(struct inode *inode, char *list, size_t list_size,
const char *name, size_t name_len)
{
const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
const size_t prefix_len = XATTR_USER_PREFIX_LEN;
const size_t total_len = prefix_len + name_len + 1;
if (!test_opt(inode->i_sb, XATTR_USER))

1
fs/jbd2/checkpoint.c
View File

@ -688,7 +688,6 @@ void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transact
J_ASSERT(transaction->t_state == T_FINISHED);
J_ASSERT(transaction->t_buffers == NULL);
J_ASSERT(transaction->t_sync_datalist == NULL);
J_ASSERT(transaction->t_forget == NULL);
J_ASSERT(transaction->t_iobuf_list == NULL);
J_ASSERT(transaction->t_shadow_list == NULL);

300
fs/jbd2/commit.c
View File

@ -22,6 +22,8 @@
#include <linux/pagemap.h>
#include <linux/jiffies.h>
#include <linux/crc32.h>
#include <linux/writeback.h>
#include <linux/backing-dev.h>
/*
* Default IO end handler for temporary BJ_IO buffer_heads.
@ -37,8 +39,8 @@ static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate)
}
/*
* When an ext3-ordered file is truncated, it is possible that many pages are
* not sucessfully freed, because they are attached to a committing transaction.
* When an ext4 file is truncated, it is possible that some pages are not
* successfully freed, because they are attached to a committing transaction.
* After the transaction commits, these pages are left on the LRU, with no
* ->mapping, and with attached buffers. These pages are trivially reclaimable
* by the VM, but their apparent absence upsets the VM accounting, and it makes
@ -79,21 +81,6 @@ nope:
__brelse(bh);
}
/*
* Try to acquire jbd_lock_bh_state() against the buffer, when j_list_lock is
* held. For ranking reasons we must trylock. If we lose, schedule away and
* return 0. j_list_lock is dropped in this case.
*/
static int inverted_lock(journal_t *journal, struct buffer_head *bh)
{
if (!jbd_trylock_bh_state(bh)) {
spin_unlock(&journal->j_list_lock);
schedule();
return 0;
}
return 1;
}
/*
* Done it all: now submit the commit record. We should have
* cleaned up our previous buffers by now, so if we are in abort
@ -112,6 +99,7 @@ static int journal_submit_commit_record(journal_t *journal,
struct buffer_head *bh;
int ret;
int barrier_done = 0;
struct timespec now = current_kernel_time();
if (is_journal_aborted(journal))
return 0;
@ -126,6 +114,8 @@ static int journal_submit_commit_record(journal_t *journal,
tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER);
tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK);
tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid);
tmp->h_commit_sec = cpu_to_be64(now.tv_sec);
tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec);
if (JBD2_HAS_COMPAT_FEATURE(journal,
JBD2_FEATURE_COMPAT_CHECKSUM)) {
@ -197,159 +187,104 @@ static int journal_wait_on_commit_record(struct buffer_head *bh)
}
/*
* Wait for all submitted IO to complete.
* write the filemap data using writepage() address_space_operations.
* We don't do block allocation here even for delalloc. We don't
* use writepages() because with dealyed allocation we may be doing
* block allocation in writepages().
*/
static int journal_wait_on_locked_list(journal_t *journal,
transaction_t *commit_transaction)
static int journal_submit_inode_data_buffers(struct address_space *mapping)
{
int ret = 0;
struct journal_head *jh;
int ret;
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
.nr_to_write = mapping->nrpages * 2,
.range_start = 0,
.range_end = i_size_read(mapping->host),
.for_writepages = 1,
};
while (commit_transaction->t_locked_list) {
struct buffer_head *bh;
jh = commit_transaction->t_locked_list->b_tprev;
bh = jh2bh(jh);
get_bh(bh);
if (buffer_locked(bh)) {
spin_unlock(&journal->j_list_lock);
wait_on_buffer(bh);
if (unlikely(!buffer_uptodate(bh)))
ret = -EIO;
spin_lock(&journal->j_list_lock);
}
if (!inverted_lock(journal, bh)) {
put_bh(bh);
spin_lock(&journal->j_list_lock);
continue;
}
if (buffer_jbd(bh) && jh->b_jlist == BJ_Locked) {
__jbd2_journal_unfile_buffer(jh);
jbd_unlock_bh_state(bh);
jbd2_journal_remove_journal_head(bh);
put_bh(bh);
} else {
jbd_unlock_bh_state(bh);
}
put_bh(bh);
cond_resched_lock(&journal->j_list_lock);
}
ret = generic_writepages(mapping, &wbc);
return ret;
}
static void journal_do_submit_data(struct buffer_head **wbuf, int bufs)
{
int i;
for (i = 0; i < bufs; i++) {
wbuf[i]->b_end_io = end_buffer_write_sync;
/* We use-up our safety reference in submit_bh() */
submit_bh(WRITE, wbuf[i]);
}
}
/*
* Submit all the data buffers to disk
* Submit all the data buffers of inode associated with the transaction to
* disk.
*
* We are in a committing transaction. Therefore no new inode can be added to
* our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently
* operate on from being released while we write out pages.
*/
static void journal_submit_data_buffers(journal_t *journal,
transaction_t *commit_transaction)
static int journal_submit_data_buffers(journal_t *journal,
transaction_t *commit_transaction)
{
struct journal_head *jh;
struct buffer_head *bh;
int locked;
int bufs = 0;
struct buffer_head **wbuf = journal->j_wbuf;
struct jbd2_inode *jinode;
int err, ret = 0;
struct address_space *mapping;
/*
* Whenever we unlock the journal and sleep, things can get added
* onto ->t_sync_datalist, so we have to keep looping back to
* write_out_data until we *know* that the list is empty.
*
* Cleanup any flushed data buffers from the data list. Even in
* abort mode, we want to flush this out as soon as possible.
*/
write_out_data:
cond_resched();
spin_lock(&journal->j_list_lock);
while (commit_transaction->t_sync_datalist) {
jh = commit_transaction->t_sync_datalist;
bh = jh2bh(jh);
locked = 0;
/* Get reference just to make sure buffer does not disappear
* when we are forced to drop various locks */
get_bh(bh);
/* If the buffer is dirty, we need to submit IO and hence
* we need the buffer lock. We try to lock the buffer without
* blocking. If we fail, we need to drop j_list_lock and do
* blocking lock_buffer().
list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
mapping = jinode->i_vfs_inode->i_mapping;
jinode->i_flags |= JI_COMMIT_RUNNING;
spin_unlock(&journal->j_list_lock);
/*
* submit the inode data buffers. We use writepage
* instead of writepages. Because writepages can do
* block allocation with delalloc. We need to write
* only allocated blocks here.
*/
if (buffer_dirty(bh)) {
if (test_set_buffer_locked(bh)) {
BUFFER_TRACE(bh, "needs blocking lock");
spin_unlock(&journal->j_list_lock);
/* Write out all data to prevent deadlocks */
journal_do_submit_data(wbuf, bufs);
bufs = 0;
lock_buffer(bh);
spin_lock(&journal->j_list_lock);
}
locked = 1;
}
/* We have to get bh_state lock. Again out of order, sigh. */
if (!inverted_lock(journal, bh)) {
jbd_lock_bh_state(bh);
spin_lock(&journal->j_list_lock);
}
/* Someone already cleaned up the buffer? */
if (!buffer_jbd(bh)
|| jh->b_transaction != commit_transaction
|| jh->b_jlist != BJ_SyncData) {
jbd_unlock_bh_state(bh);
if (locked)
unlock_buffer(bh);
BUFFER_TRACE(bh, "already cleaned up");
put_bh(bh);
continue;
}
if (locked && test_clear_buffer_dirty(bh)) {
BUFFER_TRACE(bh, "needs writeout, adding to array");
wbuf[bufs++] = bh;
__jbd2_journal_file_buffer(jh, commit_transaction,
BJ_Locked);
jbd_unlock_bh_state(bh);
if (bufs == journal->j_wbufsize) {
spin_unlock(&journal->j_list_lock);
journal_do_submit_data(wbuf, bufs);
bufs = 0;
goto write_out_data;
}
} else if (!locked && buffer_locked(bh)) {
__jbd2_journal_file_buffer(jh, commit_transaction,
BJ_Locked);
jbd_unlock_bh_state(bh);
put_bh(bh);
} else {
BUFFER_TRACE(bh, "writeout complete: unfile");
__jbd2_journal_unfile_buffer(jh);
jbd_unlock_bh_state(bh);
if (locked)
unlock_buffer(bh);
jbd2_journal_remove_journal_head(bh);
/* Once for our safety reference, once for
* jbd2_journal_remove_journal_head() */
put_bh(bh);
put_bh(bh);
}
err = journal_submit_inode_data_buffers(mapping);
if (!ret)
ret = err;
spin_lock(&journal->j_list_lock);
J_ASSERT(jinode->i_transaction == commit_transaction);
jinode->i_flags &= ~JI_COMMIT_RUNNING;
wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
}
spin_unlock(&journal->j_list_lock);
return ret;
}
if (need_resched() || spin_needbreak(&journal->j_list_lock)) {
spin_unlock(&journal->j_list_lock);
goto write_out_data;
/*
* Wait for data submitted for writeout, refile inodes to proper
* transaction if needed.
*
*/
static int journal_finish_inode_data_buffers(journal_t *journal,
transaction_t *commit_transaction)
{
struct jbd2_inode *jinode, *next_i;
int err, ret = 0;
/* For locking, see the comment in journal_submit_data_buffers() */
spin_lock(&journal->j_list_lock);
list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) {
jinode->i_flags |= JI_COMMIT_RUNNING;
spin_unlock(&journal->j_list_lock);
err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping);
if (!ret)
ret = err;
spin_lock(&journal->j_list_lock);
jinode->i_flags &= ~JI_COMMIT_RUNNING;
wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING);
}
/* Now refile inode to proper lists */
list_for_each_entry_safe(jinode, next_i,
&commit_transaction->t_inode_list, i_list) {
list_del(&jinode->i_list);
if (jinode->i_next_transaction) {
jinode->i_transaction = jinode->i_next_transaction;
jinode->i_next_transaction = NULL;
list_add(&jinode->i_list,
&jinode->i_transaction->t_inode_list);
} else {
jinode->i_transaction = NULL;
}
}
spin_unlock(&journal->j_list_lock);
journal_do_submit_data(wbuf, bufs);
return ret;
}
static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh)
@ -524,21 +459,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
* Now start flushing things to disk, in the order they appear
* on the transaction lists. Data blocks go first.
*/
err = 0;
journal_submit_data_buffers(journal, commit_transaction);
/*
* Wait for all previously submitted IO to complete if commit
* record is to be written synchronously.
*/
spin_lock(&journal->j_list_lock);
if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT))
err = journal_wait_on_locked_list(journal,
commit_transaction);
spin_unlock(&journal->j_list_lock);
err = journal_submit_data_buffers(journal, commit_transaction);
if (err)
jbd2_journal_abort(journal, err);
@ -546,16 +467,6 @@ void jbd2_journal_commit_transaction(journal_t *journal)
jbd_debug(3, "JBD: commit phase 2\n");
/*
* If we found any dirty or locked buffers, then we should have
* looped back up to the write_out_data label. If there weren't
* any then journal_clean_data_list should have wiped the list
* clean by now, so check that it is in fact empty.
*/
J_ASSERT (commit_transaction->t_sync_datalist == NULL);
jbd_debug (3, "JBD: commit phase 3\n");
/*
* Way to go: we have now written out all of the data for a
* transaction! Now comes the tricky part: we need to write out
@ -574,6 +485,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
J_ASSERT(commit_transaction->t_nr_buffers <=
commit_transaction->t_outstanding_credits);
err = 0;
descriptor = NULL;
bufs = 0;
while (commit_transaction->t_buffers) {
@ -748,15 +660,19 @@ start_journal_io:
&cbh, crc32_sum);
if (err)
__jbd2_journal_abort_hard(journal);
spin_lock(&journal->j_list_lock);
err = journal_wait_on_locked_list(journal,
commit_transaction);
spin_unlock(&journal->j_list_lock);
if (err)
__jbd2_journal_abort_hard(journal);
}
/*
* This is the right place to wait for data buffers both for ASYNC
* and !ASYNC commit. If commit is ASYNC, we need to wait only after
* the commit block went to disk (which happens above). If commit is
* SYNC, we need to wait for data buffers before we start writing
* commit block, which happens below in such setting.
*/
err = journal_finish_inode_data_buffers(journal, commit_transaction);
if (err)
jbd2_journal_abort(journal, err);
/* Lo and behold: we have just managed to send a transaction to
the log. Before we can commit it, wait for the IO so far to
complete. Control buffers being written are on the
@ -768,7 +684,7 @@ start_journal_io:
so we incur less scheduling load.
*/
jbd_debug(3, "JBD: commit phase 4\n");
jbd_debug(3, "JBD: commit phase 3\n");
/*
* akpm: these are BJ_IO, and j_list_lock is not needed.
@ -827,7 +743,7 @@ wait_for_iobuf:
J_ASSERT (commit_transaction->t_shadow_list == NULL);
jbd_debug(3, "JBD: commit phase 5\n");
jbd_debug(3, "JBD: commit phase 4\n");
/* Here we wait for the revoke record and descriptor record buffers */
wait_for_ctlbuf:
@ -854,7 +770,7 @@ wait_for_iobuf:
/* AKPM: bforget here */
}
jbd_debug(3, "JBD: commit phase 6\n");
jbd_debug(3, "JBD: commit phase 5\n");
if (!JBD2_HAS_INCOMPAT_FEATURE(journal,
JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) {
@ -874,9 +790,9 @@ wait_for_iobuf:
transaction can be removed from any checkpoint list it was on
before. */
jbd_debug(3, "JBD: commit phase 7\n");
jbd_debug(3, "JBD: commit phase 6\n");
J_ASSERT(commit_transaction->t_sync_datalist == NULL);
J_ASSERT(list_empty(&commit_transaction->t_inode_list));
J_ASSERT(commit_transaction->t_buffers == NULL);
J_ASSERT(commit_transaction->t_checkpoint_list == NULL);
J_ASSERT(commit_transaction->t_iobuf_list == NULL);
@ -997,7 +913,7 @@ restart_loop:
/* Done with this transaction! */
jbd_debug(3, "JBD: commit phase 8\n");
jbd_debug(3, "JBD: commit phase 7\n");
J_ASSERT(commit_transaction->t_state == T_COMMIT);

53
fs/jbd2/journal.c
View File

@ -50,7 +50,6 @@ EXPORT_SYMBOL(jbd2_journal_unlock_updates);
EXPORT_SYMBOL(jbd2_journal_get_write_access);
EXPORT_SYMBOL(jbd2_journal_get_create_access);
EXPORT_SYMBOL(jbd2_journal_get_undo_access);
EXPORT_SYMBOL(jbd2_journal_dirty_data);
EXPORT_SYMBOL(jbd2_journal_dirty_metadata);
EXPORT_SYMBOL(jbd2_journal_release_buffer);
EXPORT_SYMBOL(jbd2_journal_forget);
@ -82,6 +81,10 @@ EXPORT_SYMBOL(jbd2_journal_blocks_per_page);
EXPORT_SYMBOL(jbd2_journal_invalidatepage);
EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers);
EXPORT_SYMBOL(jbd2_journal_force_commit);
EXPORT_SYMBOL(jbd2_journal_file_inode);
EXPORT_SYMBOL(jbd2_journal_init_jbd_inode);
EXPORT_SYMBOL(jbd2_journal_release_jbd_inode);
EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate);
static int journal_convert_superblock_v1(journal_t *, journal_superblock_t *);
static void __journal_abort_soft (journal_t *journal, int errno);
@ -2194,6 +2197,54 @@ void jbd2_journal_put_journal_head(struct journal_head *jh)
jbd_unlock_bh_journal_head(bh);
}
/*
* Initialize jbd inode head
*/
void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode)
{
jinode->i_transaction = NULL;
jinode->i_next_transaction = NULL;
jinode->i_vfs_inode = inode;
jinode->i_flags = 0;
INIT_LIST_HEAD(&jinode->i_list);
}
/*
* Function to be called before we start removing inode from memory (i.e.,
* clear_inode() is a fine place to be called from). It removes inode from
* transaction's lists.
*/
void jbd2_journal_release_jbd_inode(journal_t *journal,
struct jbd2_inode *jinode)
{
int writeout = 0;
if (!journal)
return;
restart:
spin_lock(&journal->j_list_lock);
/* Is commit writing out inode - we have to wait */
if (jinode->i_flags & JI_COMMIT_RUNNING) {
wait_queue_head_t *wq;
DEFINE_WAIT_BIT(wait, &jinode->i_flags, __JI_COMMIT_RUNNING);
wq = bit_waitqueue(&jinode->i_flags, __JI_COMMIT_RUNNING);
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE);
spin_unlock(&journal->j_list_lock);
schedule();
finish_wait(wq, &wait.wait);
goto restart;
}
/* Do we need to wait for data writeback? */
if (journal->j_committing_transaction == jinode->i_transaction)
writeout = 1;
if (jinode->i_transaction) {
list_del(&jinode->i_list);
jinode->i_transaction = NULL;
}
spin_unlock(&journal->j_list_lock);
}
/*
* debugfs tunables
*/

365
fs/jbd2/transaction.c
View File

@ -41,7 +41,6 @@ static void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh);
* new transaction and we can't block without protecting against other
* processes trying to touch the journal while it is in transition.
*
* Called under j_state_lock
*/
static transaction_t *
@ -52,6 +51,7 @@ jbd2_get_transaction(journal_t *journal, transaction_t *transaction)
transaction->t_tid = journal->j_transaction_sequence++;
transaction->t_expires = jiffies + journal->j_commit_interval;
spin_lock_init(&transaction->t_handle_lock);
INIT_LIST_HEAD(&transaction->t_inode_list);
/* Set up the commit timer for the new transaction. */
journal->j_commit_timer.expires = round_jiffies(transaction->t_expires);
@ -942,183 +942,6 @@ out:
return err;
}
/**
* int jbd2_journal_dirty_data() - mark a buffer as containing dirty data which
* needs to be flushed before we can commit the
* current transaction.
* @handle: transaction
* @bh: bufferhead to mark
*
* The buffer is placed on the transaction's data list and is marked as
* belonging to the transaction.
*
* Returns error number or 0 on success.
*
* jbd2_journal_dirty_data() can be called via page_launder->ext3_writepage
* by kswapd.
*/
int jbd2_journal_dirty_data(handle_t *handle, struct buffer_head *bh)
{
journal_t *journal = handle->h_transaction->t_journal;
int need_brelse = 0;
struct journal_head *jh;
if (is_handle_aborted(handle))
return 0;
jh = jbd2_journal_add_journal_head(bh);
JBUFFER_TRACE(jh, "entry");
/*
* The buffer could *already* be dirty. Writeout can start
* at any time.
*/
jbd_debug(4, "jh: %p, tid:%d\n", jh, handle->h_transaction->t_tid);
/*
* What if the buffer is already part of a running transaction?
*
* There are two cases:
* 1) It is part of the current running transaction. Refile it,
* just in case we have allocated it as metadata, deallocated
* it, then reallocated it as data.
* 2) It is part of the previous, still-committing transaction.
* If all we want to do is to guarantee that the buffer will be
* written to disk before this new transaction commits, then
* being sure that the *previous* transaction has this same
* property is sufficient for us! Just leave it on its old
* transaction.
*
* In case (2), the buffer must not already exist as metadata
* --- that would violate write ordering (a transaction is free
* to write its data at any point, even before the previous
* committing transaction has committed). The caller must
* never, ever allow this to happen: there's nothing we can do
* about it in this layer.
*/
jbd_lock_bh_state(bh);
spin_lock(&journal->j_list_lock);
/* Now that we have bh_state locked, are we really still mapped? */
if (!buffer_mapped(bh)) {
JBUFFER_TRACE(jh, "unmapped buffer, bailing out");
goto no_journal;
}
if (jh->b_transaction) {
JBUFFER_TRACE(jh, "has transaction");
if (jh->b_transaction != handle->h_transaction) {
JBUFFER_TRACE(jh, "belongs to older transaction");
J_ASSERT_JH(jh, jh->b_transaction ==
journal->j_committing_transaction);
/* @@@ IS THIS TRUE ? */
/*
* Not any more. Scenario: someone does a write()
* in data=journal mode. The buffer's transaction has
* moved into commit. Then someone does another
* write() to the file. We do the frozen data copyout
* and set b_next_transaction to point to j_running_t.
* And while we're in that state, someone does a
* writepage() in an attempt to pageout the same area
* of the file via a shared mapping. At present that
* calls jbd2_journal_dirty_data(), and we get right here.
* It may be too late to journal the data. Simply
* falling through to the next test will suffice: the
* data will be dirty and wil be checkpointed. The
* ordering comments in the next comment block still
* apply.
*/
//J_ASSERT_JH(jh, jh->b_next_transaction == NULL);
/*
* If we're journalling data, and this buffer was
* subject to a write(), it could be metadata, forget
* or shadow against the committing transaction. Now,
* someone has dirtied the same darn page via a mapping
* and it is being writepage()'d.
* We *could* just steal the page from commit, with some
* fancy locking there. Instead, we just skip it -
* don't tie the page's buffers to the new transaction
* at all.
* Implication: if we crash before the writepage() data
* is written into the filesystem, recovery will replay
* the write() data.
*/
if (jh->b_jlist != BJ_None &&
jh->b_jlist != BJ_SyncData &&
jh->b_jlist != BJ_Locked) {
JBUFFER_TRACE(jh, "Not stealing");
goto no_journal;
}
/*
* This buffer may be undergoing writeout in commit. We
* can't return from here and let the caller dirty it
* again because that can cause the write-out loop in
* commit to never terminate.
*/
if (buffer_dirty(bh)) {
get_bh(bh);
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
need_brelse = 1;
sync_dirty_buffer(bh);
jbd_lock_bh_state(bh);
spin_lock(&journal->j_list_lock);
/* Since we dropped the lock... */
if (!buffer_mapped(bh)) {
JBUFFER_TRACE(jh, "buffer got unmapped");
goto no_journal;
}
/* The buffer may become locked again at any
time if it is redirtied */
}
/* journal_clean_data_list() may have got there first */
if (jh->b_transaction != NULL) {
JBUFFER_TRACE(jh, "unfile from commit");
__jbd2_journal_temp_unlink_buffer(jh);
/* It still points to the committing
* transaction; move it to this one so
* that the refile assert checks are
* happy. */
jh->b_transaction = handle->h_transaction;
}
/* The buffer will be refiled below */
}
/*
* Special case --- the buffer might actually have been
* allocated and then immediately deallocated in the previous,
* committing transaction, so might still be left on that
* transaction's metadata lists.
*/
if (jh->b_jlist != BJ_SyncData && jh->b_jlist != BJ_Locked) {
JBUFFER_TRACE(jh, "not on correct data list: unfile");
J_ASSERT_JH(jh, jh->b_jlist != BJ_Shadow);
__jbd2_journal_temp_unlink_buffer(jh);
jh->b_transaction = handle->h_transaction;
JBUFFER_TRACE(jh, "file as data");
__jbd2_journal_file_buffer(jh, handle->h_transaction,
BJ_SyncData);
}
} else {
JBUFFER_TRACE(jh, "not on a transaction");
__jbd2_journal_file_buffer(jh, handle->h_transaction, BJ_SyncData);
}
no_journal:
spin_unlock(&journal->j_list_lock);
jbd_unlock_bh_state(bh);
if (need_brelse) {
BUFFER_TRACE(bh, "brelse");
__brelse(bh);
}
JBUFFER_TRACE(jh, "exit");
jbd2_journal_put_journal_head(jh);
return 0;
}
/**
* int jbd2_journal_dirty_metadata() - mark a buffer as containing dirty metadata
* @handle: transaction to add buffer to.
@ -1541,10 +1364,10 @@ __blist_del_buffer(struct journal_head **list, struct journal_head *jh)
* Remove a buffer from the appropriate transaction list.
*
* Note that this function can *change* the value of
* bh->b_transaction->t_sync_datalist, t_buffers, t_forget,
* t_iobuf_list, t_shadow_list, t_log_list or t_reserved_list. If the caller
* is holding onto a copy of one of thee pointers, it could go bad.
* Generally the caller needs to re-read the pointer from the transaction_t.
* bh->b_transaction->t_buffers, t_forget, t_iobuf_list, t_shadow_list,
* t_log_list or t_reserved_list. If the caller is holding onto a copy of one
* of these pointers, it could go bad. Generally the caller needs to re-read
* the pointer from the transaction_t.
*
* Called under j_list_lock. The journal may not be locked.
*/
@ -1566,9 +1389,6 @@ void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh)
switch (jh->b_jlist) {
case BJ_None:
return;
case BJ_SyncData:
list = &transaction->t_sync_datalist;
break;
case BJ_Metadata:
transaction->t_nr_buffers--;
J_ASSERT_JH(jh, transaction->t_nr_buffers >= 0);
@ -1589,9 +1409,6 @@ void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh)
case BJ_Reserved:
list = &transaction->t_reserved_list;
break;
case BJ_Locked:
list = &transaction->t_locked_list;
break;
}
__blist_del_buffer(list, jh);
@ -1634,15 +1451,7 @@ __journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
goto out;
spin_lock(&journal->j_list_lock);
if (jh->b_transaction != NULL && jh->b_cp_transaction == NULL) {
if (jh->b_jlist == BJ_SyncData || jh->b_jlist == BJ_Locked) {
/* A written-back ordered data buffer */
JBUFFER_TRACE(jh, "release data");
__jbd2_journal_unfile_buffer(jh);
jbd2_journal_remove_journal_head(bh);
__brelse(bh);
}
} else if (jh->b_cp_transaction != NULL && jh->b_transaction == NULL) {
if (jh->b_cp_transaction != NULL && jh->b_transaction == NULL) {
/* written-back checkpointed metadata buffer */
if (jh->b_jlist == BJ_None) {
JBUFFER_TRACE(jh, "remove from checkpoint list");
@ -1656,12 +1465,43 @@ out:
return;
}
/*
* jbd2_journal_try_to_free_buffers() could race with
* jbd2_journal_commit_transaction(). The later might still hold the
* reference count to the buffers when inspecting them on
* t_syncdata_list or t_locked_list.
*
* jbd2_journal_try_to_free_buffers() will call this function to
* wait for the current transaction to finish syncing data buffers, before
* try to free that buffer.
*
* Called with journal->j_state_lock hold.
*/
static void jbd2_journal_wait_for_transaction_sync_data(journal_t *journal)
{
transaction_t *transaction;
tid_t tid;
spin_lock(&journal->j_state_lock);
transaction = journal->j_committing_transaction;
if (!transaction) {
spin_unlock(&journal->j_state_lock);
return;
}
tid = transaction->t_tid;
spin_unlock(&journal->j_state_lock);
jbd2_log_wait_commit(journal, tid);
}
/**
* int jbd2_journal_try_to_free_buffers() - try to free page buffers.
* @journal: journal for operation
* @page: to try and free
* @unused_gfp_mask: unused
* @gfp_mask: we use the mask to detect how hard should we try to release
* buffers. If __GFP_WAIT and __GFP_FS is set, we wait for commit code to
* release the buffers.
*
*
* For all the buffers on this page,
@ -1690,9 +1530,11 @@ out:
* journal_try_to_free_buffer() is changing its state. But that
* cannot happen because we never reallocate freed data as metadata
* while the data is part of a transaction. Yes?
*
* Return 0 on failure, 1 on success
*/
int jbd2_journal_try_to_free_buffers(journal_t *journal,
struct page *page, gfp_t unused_gfp_mask)
struct page *page, gfp_t gfp_mask)
{
struct buffer_head *head;
struct buffer_head *bh;
@ -1708,7 +1550,8 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
/*
* We take our own ref against the journal_head here to avoid
* having to add tons of locking around each instance of
* jbd2_journal_remove_journal_head() and jbd2_journal_put_journal_head().
* jbd2_journal_remove_journal_head() and
* jbd2_journal_put_journal_head().
*/
jh = jbd2_journal_grab_journal_head(bh);
if (!jh)
@ -1721,7 +1564,28 @@ int jbd2_journal_try_to_free_buffers(journal_t *journal,
if (buffer_jbd(bh))
goto busy;
} while ((bh = bh->b_this_page) != head);
ret = try_to_free_buffers(page);
/*
* There are a number of places where jbd2_journal_try_to_free_buffers()
* could race with jbd2_journal_commit_transaction(), the later still
* holds the reference to the buffers to free while processing them.
* try_to_free_buffers() failed to free those buffers. Some of the
* caller of releasepage() request page buffers to be dropped, otherwise
* treat the fail-to-free as errors (such as generic_file_direct_IO())
*
* So, if the caller of try_to_release_page() wants the synchronous
* behaviour(i.e make sure buffers are dropped upon return),
* let's wait for the current transaction to finish flush of
* dirty data buffers, then try to free those buffers again,
* with the journal locked.
*/
if (ret == 0 && (gfp_mask & __GFP_WAIT) && (gfp_mask & __GFP_FS)) {
jbd2_journal_wait_for_transaction_sync_data(journal);
ret = try_to_free_buffers(page);
}
busy:
return ret;
}
@ -1823,6 +1687,7 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
if (!buffer_jbd(bh))
goto zap_buffer_unlocked;
/* OK, we have data buffer in journaled mode */
spin_lock(&journal->j_state_lock);
jbd_lock_bh_state(bh);
spin_lock(&journal->j_list_lock);
@ -1886,15 +1751,6 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh)
}
} else if (transaction == journal->j_committing_transaction) {
JBUFFER_TRACE(jh, "on committing transaction");
if (jh->b_jlist == BJ_Locked) {
/*
* The buffer is on the committing transaction's locked
* list. We have the buffer locked, so I/O has
* completed. So we can nail the buffer now.
*/
may_free = __dispose_buffer(jh, transaction);
goto zap_buffer;
}
/*
* If it is committing, we simply cannot touch it. We
* can remove it's next_transaction pointer from the
@ -2027,9 +1883,6 @@ void __jbd2_journal_file_buffer(struct journal_head *jh,
J_ASSERT_JH(jh, !jh->b_committed_data);
J_ASSERT_JH(jh, !jh->b_frozen_data);
return;
case BJ_SyncData:
list = &transaction->t_sync_datalist;
break;
case BJ_Metadata:
transaction->t_nr_buffers++;
list = &transaction->t_buffers;
@ -2049,9 +1902,6 @@ void __jbd2_journal_file_buffer(struct journal_head *jh,
case BJ_Reserved:
list = &transaction->t_reserved_list;
break;
case BJ_Locked:
list = &transaction->t_locked_list;
break;
}
__blist_add_buffer(list, jh);
@ -2141,3 +1991,88 @@ void jbd2_journal_refile_buffer(journal_t *journal, struct journal_head *jh)
spin_unlock(&journal->j_list_lock);
__brelse(bh);
}
/*
* File inode in the inode list of the handle's transaction
*/
int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *jinode)
{
transaction_t *transaction = handle->h_transaction;
journal_t *journal = transaction->t_journal;
if (is_handle_aborted(handle))
return -EIO;
jbd_debug(4, "Adding inode %lu, tid:%d\n", jinode->i_vfs_inode->i_ino,
transaction->t_tid);
/*
* First check whether inode isn't already on the transaction's
* lists without taking the lock. Note that this check is safe
* without the lock as we cannot race with somebody removing inode
* from the transaction. The reason is that we remove inode from the
* transaction only in journal_release_jbd_inode() and when we commit
* the transaction. We are guarded from the first case by holding
* a reference to the inode. We are safe against the second case
* because if jinode->i_transaction == transaction, commit code
* cannot touch the transaction because we hold reference to it,
* and if jinode->i_next_transaction == transaction, commit code
* will only file the inode where we want it.
*/
if (jinode->i_transaction == transaction ||
jinode->i_next_transaction == transaction)
return 0;
spin_lock(&journal->j_list_lock);
if (jinode->i_transaction == transaction ||
jinode->i_next_transaction == transaction)
goto done;
/* On some different transaction's list - should be
* the committing one */
if (jinode->i_transaction) {
J_ASSERT(jinode->i_next_transaction == NULL);
J_ASSERT(jinode->i_transaction ==
journal->j_committing_transaction);
jinode->i_next_transaction = transaction;
goto done;
}
/* Not on any transaction list... */
J_ASSERT(!jinode->i_next_transaction);
jinode->i_transaction = transaction;
list_add(&jinode->i_list, &transaction->t_inode_list);
done:
spin_unlock(&journal->j_list_lock);
return 0;
}
/*
* This function must be called when inode is journaled in ordered mode
* before truncation happens. It starts writeout of truncated part in
* case it is in the committing transaction so that we stand to ordered
* mode consistency guarantees.
*/
int jbd2_journal_begin_ordered_truncate(struct jbd2_inode *inode,
loff_t new_size)
{
journal_t *journal;
transaction_t *commit_trans;
int ret = 0;
if (!inode->i_transaction && !inode->i_next_transaction)
goto out;
journal = inode->i_transaction->t_journal;
spin_lock(&journal->j_state_lock);
commit_trans = journal->j_committing_transaction;
spin_unlock(&journal->j_state_lock);
if (inode->i_transaction == commit_trans) {
ret = filemap_fdatawrite_range(inode->i_vfs_inode->i_mapping,
new_size, LLONG_MAX);
if (ret)
jbd2_journal_abort(journal, ret);
}
out:
return ret;
}

14
fs/mpage.c
View File

@ -82,7 +82,7 @@ static void mpage_end_io_write(struct bio *bio, int err)
bio_put(bio);
}
static struct bio *mpage_bio_submit(int rw, struct bio *bio)
struct bio *mpage_bio_submit(int rw, struct bio *bio)
{
bio->bi_end_io = mpage_end_io_read;
if (rw == WRITE)
@ -90,6 +90,7 @@ static struct bio *mpage_bio_submit(int rw, struct bio *bio)
submit_bio(rw, bio);
return NULL;
}
EXPORT_SYMBOL(mpage_bio_submit);
static struct bio *
mpage_alloc(struct block_device *bdev,
@ -435,15 +436,9 @@ EXPORT_SYMBOL(mpage_readpage);
* written, so it can intelligently allocate a suitably-sized BIO. For now,
* just allocate full-size (16-page) BIOs.
*/
struct mpage_data {
struct bio *bio;
sector_t last_block_in_bio;
get_block_t *get_block;
unsigned use_writepage;
};
static int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data)
int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data)
{
struct mpage_data *mpd = data;
struct bio *bio = mpd->bio;
@ -651,6 +646,7 @@ out:
mpd->bio = bio;
return ret;
}
EXPORT_SYMBOL(__mpage_writepage);
/**
* mpage_writepages - walk the list of dirty pages of the given address space & writepage() all of them

2
include/linux/fs.h
View File

@ -1740,6 +1740,8 @@ extern int wait_on_page_writeback_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
extern int __filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end, int sync_mode);
extern int filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end);
extern long do_fsync(struct file *file, int datasync);
extern void sync_supers(void);

73
include/linux/jbd2.h
View File

@ -168,6 +168,8 @@ struct commit_header {
unsigned char h_chksum_size;
unsigned char h_padding[2];
__be32 h_chksum[JBD2_CHECKSUM_BYTES];
__be64 h_commit_sec;
__be32 h_commit_nsec;
};
/*
@ -379,6 +381,38 @@ static inline void jbd_unlock_bh_journal_head(struct buffer_head *bh)
bit_spin_unlock(BH_JournalHead, &bh->b_state);
}
/* Flags in jbd_inode->i_flags */
#define __JI_COMMIT_RUNNING 0
/* Commit of the inode data in progress. We use this flag to protect us from
* concurrent deletion of inode. We cannot use reference to inode for this
* since we cannot afford doing last iput() on behalf of kjournald
*/
#define JI_COMMIT_RUNNING (1 << __JI_COMMIT_RUNNING)
/**
* struct jbd_inode is the structure linking inodes in ordered mode
* present in a transaction so that we can sync them during commit.
*/
struct jbd2_inode {
/* Which transaction does this inode belong to? Either the running
* transaction or the committing one. [j_list_lock] */
transaction_t *i_transaction;
/* Pointer to the running transaction modifying inode's data in case
* there is already a committing transaction touching it. [j_list_lock] */
transaction_t *i_next_transaction;
/* List of inodes in the i_transaction [j_list_lock] */
struct list_head i_list;
/* VFS inode this inode belongs to [constant during the lifetime
* of the structure] */
struct inode *i_vfs_inode;
/* Flags of inode [j_list_lock] */
unsigned int i_flags;
};
struct jbd2_revoke_table_s;
/**
@ -508,24 +542,12 @@ struct transaction_s
*/
struct journal_head *t_reserved_list;
/*
* Doubly-linked circular list of all buffers under writeout during
* commit [j_list_lock]
*/
struct journal_head *t_locked_list;
/*
* Doubly-linked circular list of all metadata buffers owned by this
* transaction [j_list_lock]
*/
struct journal_head *t_buffers;
/*
* Doubly-linked circular list of all data buffers still to be
* flushed before this transaction can be committed [j_list_lock]
*/
struct journal_head *t_sync_datalist;
/*
* Doubly-linked circular list of all forget buffers (superseded
* buffers which we can un-checkpoint once this transaction commits)
@ -564,6 +586,12 @@ struct transaction_s
*/
struct journal_head *t_log_list;
/*
* List of inodes whose data we've modified in data=ordered mode.
* [j_list_lock]
*/
struct list_head t_inode_list;
/*
* Protects info related to handles
*/
@ -1004,7 +1032,6 @@ extern int jbd2_journal_extend (handle_t *, int nblocks);
extern int jbd2_journal_get_write_access(handle_t *, struct buffer_head *);
extern int jbd2_journal_get_create_access (handle_t *, struct buffer_head *);
extern int jbd2_journal_get_undo_access(handle_t *, struct buffer_head *);
extern int jbd2_journal_dirty_data (handle_t *, struct buffer_head *);
extern int jbd2_journal_dirty_metadata (handle_t *, struct buffer_head *);
extern void jbd2_journal_release_buffer (handle_t *, struct buffer_head *);
extern int jbd2_journal_forget (handle_t *, struct buffer_head *);
@ -1044,6 +1071,10 @@ extern void jbd2_journal_ack_err (journal_t *);
extern int jbd2_journal_clear_err (journal_t *);
extern int jbd2_journal_bmap(journal_t *, unsigned long, unsigned long long *);
extern int jbd2_journal_force_commit(journal_t *);
extern int jbd2_journal_file_inode(handle_t *handle, struct jbd2_inode *inode);
extern int jbd2_journal_begin_ordered_truncate(struct jbd2_inode *inode, loff_t new_size);
extern void jbd2_journal_init_jbd_inode(struct jbd2_inode *jinode, struct inode *inode);
extern void jbd2_journal_release_jbd_inode(journal_t *journal, struct jbd2_inode *jinode);
/*
* journal_head management
@ -1179,15 +1210,13 @@ static inline int jbd_space_needed(journal_t *journal)
/* journaling buffer types */
#define BJ_None 0 /* Not journaled */
#define BJ_SyncData 1 /* Normal data: flush before commit */
#define BJ_Metadata 2 /* Normal journaled metadata */
#define BJ_Forget 3 /* Buffer superseded by this transaction */
#define BJ_IO 4 /* Buffer is for temporary IO use */
#define BJ_Shadow 5 /* Buffer contents being shadowed to the log */
#define BJ_LogCtl 6 /* Buffer contains log descriptors */
#define BJ_Reserved 7 /* Buffer is reserved for access by journal */
#define BJ_Locked 8 /* Locked for I/O during commit */
#define BJ_Types 9
#define BJ_Metadata 1 /* Normal journaled metadata */
#define BJ_Forget 2 /* Buffer superseded by this transaction */
#define BJ_IO 3 /* Buffer is for temporary IO use */
#define BJ_Shadow 4 /* Buffer contents being shadowed to the log */
#define BJ_LogCtl 5 /* Buffer contains log descriptors */
#define BJ_Reserved 6 /* Buffer is reserved for access by journal */
#define BJ_Types 7
extern int jbd_blocks_per_page(struct inode *inode);

10
include/linux/mpage.h
View File

@ -11,11 +11,21 @@
*/
#ifdef CONFIG_BLOCK
struct mpage_data {
struct bio *bio;
sector_t last_block_in_bio;
get_block_t *get_block;
unsigned use_writepage;
};
struct writeback_control;
struct bio *mpage_bio_submit(int rw, struct bio *bio);
int mpage_readpages(struct address_space *mapping, struct list_head *pages,
unsigned nr_pages, get_block_t get_block);
int mpage_readpage(struct page *page, get_block_t get_block);
int __mpage_writepage(struct page *page, struct writeback_control *wbc,
void *data);
int mpage_writepages(struct address_space *mapping,
struct writeback_control *wbc, get_block_t get_block);
int mpage_writepage(struct page *page, get_block_t *get_block,

12
include/linux/percpu_counter.h
View File

@ -35,7 +35,7 @@ int percpu_counter_init_irq(struct percpu_counter *fbc, s64 amount);
void percpu_counter_destroy(struct percpu_counter *fbc);
void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
s64 __percpu_counter_sum(struct percpu_counter *fbc);
s64 __percpu_counter_sum(struct percpu_counter *fbc, int set);
static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
{
@ -44,13 +44,19 @@ static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
{
s64 ret = __percpu_counter_sum(fbc);
s64 ret = __percpu_counter_sum(fbc, 0);
return ret < 0 ? 0 : ret;
}
static inline s64 percpu_counter_sum_and_set(struct percpu_counter *fbc)
{
return __percpu_counter_sum(fbc, 1);
}
static inline s64 percpu_counter_sum(struct percpu_counter *fbc)
{
return __percpu_counter_sum(fbc);
return __percpu_counter_sum(fbc, 0);
}
static inline s64 percpu_counter_read(struct percpu_counter *fbc)

1
include/linux/writeback.h
View File

@ -63,6 +63,7 @@ struct writeback_control {
unsigned for_writepages:1; /* This is a writepages() call */
unsigned range_cyclic:1; /* range_start is cyclic */
unsigned more_io:1; /* more io to be dispatched */
unsigned range_cont:1;
};
/*

7
lib/percpu_counter.c
View File

@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add);
* Add up all the per-cpu counts, return the result. This is a more accurate
* but much slower version of percpu_counter_read_positive()
*/
s64 __percpu_counter_sum(struct percpu_counter *fbc)
s64 __percpu_counter_sum(struct percpu_counter *fbc, int set)
{
s64 ret;
int cpu;
@ -62,7 +62,12 @@ s64 __percpu_counter_sum(struct percpu_counter *fbc)
for_each_online_cpu(cpu) {
s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
ret += *pcount;
if (set)
*pcount = 0;
}
if (set)
fbc->count = ret;
spin_unlock(&fbc->lock);
return ret;
}

3
mm/filemap.c
View File

@ -236,11 +236,12 @@ int filemap_fdatawrite(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_fdatawrite);
static int filemap_fdatawrite_range(struct address_space *mapping, loff_t start,
int filemap_fdatawrite_range(struct address_space *mapping, loff_t start,
loff_t end)
{
return __filemap_fdatawrite_range(mapping, start, end, WB_SYNC_ALL);
}
EXPORT_SYMBOL(filemap_fdatawrite_range);
/**
* filemap_flush - mostly a non-blocking flush

3
mm/page-writeback.c
View File

@ -960,6 +960,9 @@ retry:
}
if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
mapping->writeback_index = index;
if (wbc->range_cont)
wbc->range_start = index << PAGE_CACHE_SHIFT;
return ret;
}
EXPORT_SYMBOL(write_cache_pages);