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f2fs: add f2fs_map_blocks

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This patch introduces f2fs_map_blocks structure likewise ext4_map_blocks.
Now, f2fs uses f2fs_map_blocks when handling get_block.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-04-06 19:55:34 -07:00
parent 76f105a2db
commit 003a3e1d60
3 changed files with 71 additions and 45 deletions
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72
fs/f2fs/data.c
View File

@ -251,19 +251,6 @@ int f2fs_reserve_block(struct dnode_of_data *dn, pgoff_t index)
return err;
}
static void f2fs_map_bh(struct super_block *sb, pgoff_t pgofs,
struct extent_info *ei, struct buffer_head *bh_result)
{
unsigned int blkbits = sb->s_blocksize_bits;
size_t max_size = bh_result->b_size;
size_t mapped_size;
clear_buffer_new(bh_result);
map_bh(bh_result, sb, ei->blk + pgofs - ei->fofs);
mapped_size = (ei->fofs + ei->len - pgofs) << blkbits;
bh_result->b_size = min(max_size, mapped_size);
}
static bool lookup_extent_info(struct inode *inode, pgoff_t pgofs,
struct extent_info *ei)
{
@ -1208,18 +1195,18 @@ out:
}
/*
* get_data_block() now supported readahead/bmap/rw direct_IO with mapped bh.
* f2fs_map_blocks() now supported readahead/bmap/rw direct_IO with
* f2fs_map_blocks structure.
* If original data blocks are allocated, then give them to blockdev.
* Otherwise,
* a. preallocate requested block addresses
* b. do not use extent cache for better performance
* c. give the block addresses to blockdev
*/
static int __get_data_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create, bool fiemap)
static int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
int create, bool fiemap)
{
unsigned int blkbits = inode->i_sb->s_blocksize_bits;
unsigned maxblocks = bh_result->b_size >> blkbits;
unsigned int maxblocks = map->m_len;
struct dnode_of_data dn;
int mode = create ? ALLOC_NODE : LOOKUP_NODE_RA;
pgoff_t pgofs, end_offset;
@ -1227,11 +1214,16 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
struct extent_info ei;
bool allocated = false;
/* Get the page offset from the block offset(iblock) */
pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
map->m_len = 0;
map->m_flags = 0;
/* it only supports block size == page size */
pgofs = (pgoff_t)map->m_lblk;
if (f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
f2fs_map_bh(inode->i_sb, pgofs, &ei, bh_result);
map->m_pblk = ei.blk + pgofs - ei.fofs;
map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
map->m_flags = F2FS_MAP_MAPPED;
goto out;
}
@ -1250,21 +1242,21 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
goto put_out;
if (dn.data_blkaddr != NULL_ADDR) {
clear_buffer_new(bh_result);
map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
map->m_flags = F2FS_MAP_MAPPED;
map->m_pblk = dn.data_blkaddr;
} else if (create) {
err = __allocate_data_block(&dn);
if (err)
goto put_out;
allocated = true;
set_buffer_new(bh_result);
map_bh(bh_result, inode->i_sb, dn.data_blkaddr);
map->m_flags = F2FS_MAP_NEW | F2FS_MAP_MAPPED;
map->m_pblk = dn.data_blkaddr;
} else {
goto put_out;
}
end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
bh_result->b_size = (((size_t)1) << blkbits);
map->m_len = 1;
dn.ofs_in_node++;
pgofs++;
@ -1288,22 +1280,22 @@ get_next:
end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
}
if (maxblocks > (bh_result->b_size >> blkbits)) {
if (maxblocks > map->m_len) {
block_t blkaddr = datablock_addr(dn.node_page, dn.ofs_in_node);
if (blkaddr == NULL_ADDR && create) {
err = __allocate_data_block(&dn);
if (err)
goto sync_out;
allocated = true;
set_buffer_new(bh_result);
map->m_flags |= F2FS_MAP_NEW;
blkaddr = dn.data_blkaddr;
}
/* Give more consecutive addresses for the readahead */
if (blkaddr == (bh_result->b_blocknr + ofs)) {
if (map->m_pblk != NEW_ADDR && blkaddr == (map->m_pblk + ofs)) {
ofs++;
dn.ofs_in_node++;
pgofs++;
bh_result->b_size += (((size_t)1) << blkbits);
map->m_len++;
goto get_next;
}
}
@ -1316,10 +1308,28 @@ unlock_out:
if (create)
f2fs_unlock_op(F2FS_I_SB(inode));
out:
trace_f2fs_get_data_block(inode, iblock, bh_result, err);
trace_f2fs_map_blocks(inode, map, err);
return err;
}
static int __get_data_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh, int create, bool fiemap)
{
struct f2fs_map_blocks map;
int ret;
map.m_lblk = iblock;
map.m_len = bh->b_size >> inode->i_blkbits;
ret = f2fs_map_blocks(inode, &map, create, fiemap);
if (!ret) {
map_bh(bh, inode->i_sb, map.m_pblk);
bh->b_state = (bh->b_state & ~F2FS_MAP_FLAGS) | map.m_flags;
bh->b_size = map.m_len << inode->i_blkbits;
}
return ret;
}
static int get_data_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{

16
fs/f2fs/f2fs.h
View File

@ -321,6 +321,22 @@ struct extent_tree {
unsigned int count; /* # of extent node in rb-tree*/
};
/*
* This structure is taken from ext4_map_blocks.
*
* Note that, however, f2fs uses NEW and MAPPED flags for f2fs_map_blocks().
*/
#define F2FS_MAP_NEW (1 << BH_New)
#define F2FS_MAP_MAPPED (1 << BH_Mapped)
#define F2FS_MAP_FLAGS (F2FS_MAP_NEW | F2FS_MAP_MAPPED)
struct f2fs_map_blocks {
block_t m_pblk;
block_t m_lblk;
unsigned int m_len;
unsigned int m_flags;
};
/*
* i_advise uses FADVISE_XXX_BIT. We can add additional hints later.
*/

28
include/trace/events/f2fs.h
View File

@ -117,6 +117,7 @@ TRACE_DEFINE_ENUM(CP_DISCARD);
{ CP_DISCARD, "Discard" })
struct victim_sel_policy;
struct f2fs_map_blocks;
DECLARE_EVENT_CLASS(f2fs__inode,
@ -481,36 +482,35 @@ TRACE_EVENT(f2fs_truncate_partial_nodes,
__entry->err)
);
TRACE_EVENT(f2fs_get_data_block,
TP_PROTO(struct inode *inode, sector_t iblock,
struct buffer_head *bh, int ret),
TRACE_EVENT(f2fs_map_blocks,
TP_PROTO(struct inode *inode, struct f2fs_map_blocks *map, int ret),
TP_ARGS(inode, iblock, bh, ret),
TP_ARGS(inode, map, ret),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(ino_t, ino)
__field(sector_t, iblock)
__field(sector_t, bh_start)
__field(size_t, bh_size)
__field(block_t, m_lblk)
__field(block_t, m_pblk)
__field(unsigned int, m_len)
__field(int, ret)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->iblock = iblock;
__entry->bh_start = bh->b_blocknr;
__entry->bh_size = bh->b_size;
__entry->m_lblk = map->m_lblk;
__entry->m_pblk = map->m_pblk;
__entry->m_len = map->m_len;
__entry->ret = ret;
),
TP_printk("dev = (%d,%d), ino = %lu, file offset = %llu, "
"start blkaddr = 0x%llx, len = 0x%llx bytes, err = %d",
"start blkaddr = 0x%llx, len = 0x%llx, err = %d",
show_dev_ino(__entry),
(unsigned long long)__entry->iblock,
(unsigned long long)__entry->bh_start,
(unsigned long long)__entry->bh_size,
(unsigned long long)__entry->m_lblk,
(unsigned long long)__entry->m_pblk,
(unsigned long long)__entry->m_len,
__entry->ret)
);