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ocfs2: Read from an unwritten extent returns zeros

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Return an optional extent flags field from our lookup functions and wire up
callers to treat unwritten regions as holes for the purpose of returning
zeros to the user.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2007-03-09 16:21:46 -08:00
parent e48edee2d8
commit 49cb8d2d49
10 changed files with 45 additions and 23 deletions
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11
fs/ocfs2/alloc.c
View File

@ -3487,6 +3487,7 @@ static int ocfs2_grab_eof_pages(struct inode *inode, loff_t isize, struct page *
{
int i, numpages = 0, ret = 0;
unsigned int csize = OCFS2_SB(inode->i_sb)->s_clustersize;
unsigned int ext_flags;
struct super_block *sb = inode->i_sb;
struct address_space *mapping = inode->i_mapping;
unsigned long index;
@ -3499,7 +3500,7 @@ static int ocfs2_grab_eof_pages(struct inode *inode, loff_t isize, struct page *
goto out;
ret = ocfs2_extent_map_get_blocks(inode, isize >> sb->s_blocksize_bits,
phys, NULL);
phys, NULL, &ext_flags);
if (ret) {
mlog_errno(ret);
goto out;
@ -3509,6 +3510,11 @@ static int ocfs2_grab_eof_pages(struct inode *inode, loff_t isize, struct page *
if (*phys == 0)
goto out;
/* Tail is marked as unwritten, we can count on write to zero
* in that case. */
if (ext_flags & OCFS2_EXT_UNWRITTEN)
goto out;
next_cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, isize);
index = isize >> PAGE_CACHE_SHIFT;
do {
@ -3579,9 +3585,6 @@ int ocfs2_zero_tail_for_truncate(struct inode *inode, handle_t *handle,
goto out;
}
/*
* Truncate on an i_size boundary - nothing more to do.
*/
if (numpages == 0)
goto out;

21
fs/ocfs2/aops.c
View File

@ -137,6 +137,7 @@ static int ocfs2_get_block(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int err = 0;
unsigned int ext_flags;
u64 p_blkno, past_eof;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
@ -153,7 +154,8 @@ static int ocfs2_get_block(struct inode *inode, sector_t iblock,
goto bail;
}
err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL);
err = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno, NULL,
&ext_flags);
if (err) {
mlog(ML_ERROR, "Error %d from get_blocks(0x%p, %llu, 1, "
"%llu, NULL)\n", err, inode, (unsigned long long)iblock,
@ -171,7 +173,8 @@ static int ocfs2_get_block(struct inode *inode, sector_t iblock,
"ino %lu, iblock %llu\n", inode->i_ino,
(unsigned long long)iblock);
if (p_blkno)
/* Treat the unwritten extent as a hole for zeroing purposes. */
if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
map_bh(bh_result, inode->i_sb, p_blkno);
if (!ocfs2_sparse_alloc(osb)) {
@ -396,7 +399,7 @@ static sector_t ocfs2_bmap(struct address_space *mapping, sector_t block)
down_read(&OCFS2_I(inode)->ip_alloc_sem);
}
err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL);
err = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL, NULL);
if (!INODE_JOURNAL(inode)) {
up_read(&OCFS2_I(inode)->ip_alloc_sem);
@ -438,6 +441,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
int ret;
u64 p_blkno, inode_blocks;
int contig_blocks;
unsigned int ext_flags;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
@ -458,7 +462,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
/* This figures out the size of the next contiguous block, and
* our logical offset */
ret = ocfs2_extent_map_get_blocks(inode, iblock, &p_blkno,
&contig_blocks);
&contig_blocks, &ext_flags);
if (ret) {
mlog(ML_ERROR, "get_blocks() failed iblock=%llu\n",
(unsigned long long)iblock);
@ -478,8 +482,10 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
/*
* get_more_blocks() expects us to describe a hole by clearing
* the mapped bit on bh_result().
*
* Consider an unwritten extent as a hole.
*/
if (p_blkno)
if (p_blkno && !(ext_flags & OCFS2_EXT_UNWRITTEN))
map_bh(bh_result, inode->i_sb, p_blkno);
else {
/*
@ -1111,7 +1117,8 @@ static ssize_t ocfs2_write(struct file *file, u32 phys, handle_t *handle,
}
}
ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL);
ret = ocfs2_extent_map_get_blocks(inode, v_blkno, &p_blkno, NULL,
NULL);
if (ret < 0) {
/*
@ -1215,7 +1222,7 @@ ssize_t ocfs2_buffered_write_cluster(struct file *file, loff_t pos,
*/
down_write(&OCFS2_I(inode)->ip_alloc_sem);
ret = ocfs2_get_clusters(inode, wc.w_cpos, &phys, NULL);
ret = ocfs2_get_clusters(inode, wc.w_cpos, &phys, NULL, NULL);
if (ret) {
mlog_errno(ret);
goto out_meta;

2
fs/ocfs2/dir.c
View File

@ -379,7 +379,7 @@ int ocfs2_do_extend_dir(struct super_block *sb,
status = ocfs2_extent_map_get_blocks(dir, (dir->i_blocks >>
(sb->s_blocksize_bits - 9)),
&p_blkno, NULL);
&p_blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;

14
fs/ocfs2/extent_map.c
View File

@ -70,9 +70,11 @@ static int ocfs2_search_extent_list(struct ocfs2_extent_list *el,
}
int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
u32 *p_cluster, u32 *num_clusters)
u32 *p_cluster, u32 *num_clusters,
unsigned int *extent_flags)
{
int ret, i;
unsigned int flags = 0;
struct buffer_head *di_bh = NULL;
struct buffer_head *eb_bh = NULL;
struct ocfs2_dinode *di;
@ -142,8 +144,13 @@ int ocfs2_get_clusters(struct inode *inode, u32 v_cluster,
if (num_clusters)
*num_clusters = ocfs2_rec_clusters(el, rec) - coff;
flags = rec->e_flags;
}
if (extent_flags)
*extent_flags = flags;
out:
brelse(di_bh);
brelse(eb_bh);
@ -155,7 +162,7 @@ out:
* all while the map is in the process of being updated.
*/
int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
int *ret_count)
int *ret_count, unsigned int *extent_flags)
{
int ret;
int bpc = ocfs2_clusters_to_blocks(inode->i_sb, 1);
@ -164,7 +171,8 @@ int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
cpos = ocfs2_blocks_to_clusters(inode->i_sb, v_blkno);
ret = ocfs2_get_clusters(inode, cpos, &p_cluster, &num_clusters);
ret = ocfs2_get_clusters(inode, cpos, &p_cluster, &num_clusters,
extent_flags);
if (ret) {
mlog_errno(ret);
goto out;

4
fs/ocfs2/extent_map.h
View File

@ -26,8 +26,8 @@
#define _EXTENT_MAP_H
int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
u32 *num_clusters);
u32 *num_clusters, unsigned int *extent_flags);
int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
int *ret_count);
int *ret_count, unsigned int *extent_flags);
#endif /* _EXTENT_MAP_H */

6
fs/ocfs2/file.c
View File

@ -1127,6 +1127,7 @@ static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
size_t count)
{
int ret = 0;
unsigned int extent_flags;
u32 cpos, clusters, extent_len, phys_cpos;
struct super_block *sb = inode->i_sb;
@ -1134,13 +1135,14 @@ static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
while (clusters) {
ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len);
ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
&extent_flags);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
if (phys_cpos == 0) {
if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
ret = 1;
break;
}

3
fs/ocfs2/inode.c
View File

@ -1105,7 +1105,8 @@ struct buffer_head *ocfs2_bread(struct inode *inode,
return NULL;
}
tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL);
tmperr = ocfs2_extent_map_get_blocks(inode, block, &p_blkno, NULL,
NULL);
if (tmperr < 0) {
mlog_errno(tmperr);
goto fail;

2
fs/ocfs2/journal.c
View File

@ -670,7 +670,7 @@ static int ocfs2_force_read_journal(struct inode *inode)
(inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9))) {
status = ocfs2_extent_map_get_blocks(inode, v_blkno,
&p_blkno, &p_blocks);
&p_blkno, &p_blocks, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;

3
fs/ocfs2/namei.c
View File

@ -1511,7 +1511,8 @@ static int ocfs2_create_symlink_data(struct ocfs2_super *osb,
goto bail;
}
status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks);
status = ocfs2_extent_map_get_blocks(inode, 0, &p_blkno, &p_blocks,
NULL);
if (status < 0) {
mlog_errno(status);
goto bail;

2
fs/ocfs2/slot_map.c
View File

@ -197,7 +197,7 @@ int ocfs2_init_slot_info(struct ocfs2_super *osb)
goto bail;
}
status = ocfs2_extent_map_get_blocks(inode, 0ULL, &blkno, NULL);
status = ocfs2_extent_map_get_blocks(inode, 0ULL, &blkno, NULL, NULL);
if (status < 0) {
mlog_errno(status);
goto bail;