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ocfs2: add ocfs2_overwrite_io()

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Add ocfs2_overwrite_io function, which is used to judge if overwrite
allocated blocks, otherwise, the write will bring extra block allocation
overhead.

[[email protected]: v3]
  Link: http://lkml.kernel.org/r/[email protected]
[[email protected]: v2]
  Link: http://lkml.kernel.org/r/[email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Gang He <[email protected]>
Reviewed-by: Changwei Ge <[email protected]>
Cc: Mark Fasheh <[email protected]>
Cc: Joel Becker <[email protected]>
Cc: Junxiao Bi <[email protected]>
Cc: Joseph Qi <[email protected]>
Cc: Jun Piao <[email protected]>
Cc: alex chen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Gang He 2018-01-31 16:15:21 -08:00 • committed by Linus Torvalds
commit ac604d3cdb
2 changed files with 48 additions and 0 deletions
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45
fs/ocfs2/extent_map.c
View file

@ -38,6 +38,7 @@
#include "inode.h"
#include "super.h"
#include "symlink.h"
#include "aops.h"
#include "ocfs2_trace.h"
#include "buffer_head_io.h"
@ -832,6 +833,50 @@ out:
return ret;
}
/* Is IO overwriting allocated blocks? */
int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
u64 map_start, u64 map_len)
{
int ret = 0, is_last;
u32 mapping_end, cpos;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_extent_rec rec;
if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
if (ocfs2_size_fits_inline_data(di_bh, map_start + map_len))
return ret;
else
return -EAGAIN;
}
cpos = map_start >> osb->s_clustersize_bits;
mapping_end = ocfs2_clusters_for_bytes(inode->i_sb,
map_start + map_len);
is_last = 0;
while (cpos < mapping_end && !is_last) {
ret = ocfs2_get_clusters_nocache(inode, di_bh, cpos,
NULL, &rec, &is_last);
if (ret) {
mlog_errno(ret);
goto out;
}
if (rec.e_blkno == 0ULL)
break;
if (rec.e_flags & OCFS2_EXT_REFCOUNTED)
break;
cpos = le32_to_cpu(rec.e_cpos) +
le16_to_cpu(rec.e_leaf_clusters);
}
if (cpos < mapping_end)
ret = -EAGAIN;
out:
return ret;
}
int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int whence)
{
struct inode *inode = file->f_mapping->host;

3
fs/ocfs2/extent_map.h
View file

@ -53,6 +53,9 @@ int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
u64 map_start, u64 map_len);
int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
u64 map_start, u64 map_len);
int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,