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xfs: make xfs_bmapi_convert_delalloc() to allocate the target offset

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Since xfs_bmapi_convert_delalloc() only attempts to allocate the entire
delalloc extent and require multiple invocations to allocate the target
offset. So xfs_convert_blocks() add a loop to do this job and we call it
in the write back path, but xfs_convert_blocks() isn't a common helper.
Let's do it in xfs_bmapi_convert_delalloc() and drop
xfs_convert_blocks(), preparing for the post EOF delalloc blocks
converting in the buffered write begin path.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Chandan Babu R <chandanbabu@kernel.org>
This commit is contained in:
Zhang Yi 2024-04-25 21:13:29 +08:00 committed by Chandan Babu R
parent fc8d0ba0ff
commit 2e08371a83
2 changed files with 46 additions and 42 deletions
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34
fs/xfs/libxfs/xfs_bmap.c
View File

@ -4590,8 +4590,8 @@ error0:
* invocations to allocate the target offset if a large enough physical extent
* is not available.
*/
int
xfs_bmapi_convert_delalloc(
static int
xfs_bmapi_convert_one_delalloc(
struct xfs_inode *ip,
int whichfork,
xfs_off_t offset,
@ -4724,6 +4724,36 @@ out_trans_cancel:
return error;
}
/*
* Pass in a dellalloc extent and convert it to real extents, return the real
* extent that maps offset_fsb in iomap.
*/
int
xfs_bmapi_convert_delalloc(
struct xfs_inode *ip,
int whichfork,
loff_t offset,
struct iomap *iomap,
unsigned int *seq)
{
int error;
/*
* Attempt to allocate whatever delalloc extent currently backs offset
* and put the result into iomap. Allocate in a loop because it may
* take several attempts to allocate real blocks for a contiguous
* delalloc extent if free space is sufficiently fragmented.
*/
do {
error = xfs_bmapi_convert_one_delalloc(ip, whichfork, offset,
iomap, seq);
if (error)
return error;
} while (iomap->offset + iomap->length <= offset);
return 0;
}
int
xfs_bmapi_remap(
struct xfs_trans *tp,

54
fs/xfs/xfs_aops.c
View File

@ -233,45 +233,6 @@ xfs_imap_valid(
return true;
}
/*
* Pass in a dellalloc extent and convert it to real extents, return the real
* extent that maps offset_fsb in wpc->iomap.
*
* The current page is held locked so nothing could have removed the block
* backing offset_fsb, although it could have moved from the COW to the data
* fork by another thread.
*/
static int
xfs_convert_blocks(
struct iomap_writepage_ctx *wpc,
struct xfs_inode *ip,
int whichfork,
loff_t offset)
{
int error;
unsigned *seq;
if (whichfork == XFS_COW_FORK)
seq = &XFS_WPC(wpc)->cow_seq;
else
seq = &XFS_WPC(wpc)->data_seq;
/*
* Attempt to allocate whatever delalloc extent currently backs offset
* and put the result into wpc->iomap. Allocate in a loop because it
* may take several attempts to allocate real blocks for a contiguous
* delalloc extent if free space is sufficiently fragmented.
*/
do {
error = xfs_bmapi_convert_delalloc(ip, whichfork, offset,
&wpc->iomap, seq);
if (error)
return error;
} while (wpc->iomap.offset + wpc->iomap.length <= offset);
return 0;
}
static int
xfs_map_blocks(
struct iomap_writepage_ctx *wpc,
@ -290,6 +251,7 @@ xfs_map_blocks(
struct xfs_iext_cursor icur;
int retries = 0;
int error = 0;
unsigned int *seq;
if (xfs_is_shutdown(mp))
return -EIO;
@ -387,7 +349,19 @@ retry:
trace_xfs_map_blocks_found(ip, offset, count, whichfork, &imap);
return 0;
allocate_blocks:
error = xfs_convert_blocks(wpc, ip, whichfork, offset);
/*
* Convert a dellalloc extent to a real one. The current page is held
* locked so nothing could have removed the block backing offset_fsb,
* although it could have moved from the COW to the data fork by another
* thread.
*/
if (whichfork == XFS_COW_FORK)
seq = &XFS_WPC(wpc)->cow_seq;
else
seq = &XFS_WPC(wpc)->data_seq;
error = xfs_bmapi_convert_delalloc(ip, whichfork, offset,
&wpc->iomap, seq);
if (error) {
/*
* If we failed to find the extent in the COW fork we might have