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xfs: consolidate preallocation in xfs_file_fallocate

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Remove xfs_zero_file_space and reorganize xfs_file_fallocate so that a
single call to xfs_alloc_file_space covers all modes that preallocate
blocks.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-10-24 22:26:27 -07:00 committed by Darrick J. Wong
parent 7a42c70ea0
commit 360c09c01c
3 changed files with 24 additions and 47 deletions
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37
fs/xfs/xfs_bmap_util.c
View file

@ -1133,43 +1133,6 @@ xfs_free_file_space(
return error;
}
/*
* Preallocate and zero a range of a file. This mechanism has the allocation
* semantics of fallocate and in addition converts data in the range to zeroes.
*/
int
xfs_zero_file_space(
struct xfs_inode *ip,
xfs_off_t offset,
xfs_off_t len)
{
struct xfs_mount *mp = ip->i_mount;
uint blksize;
int error;
trace_xfs_zero_file_space(ip);
blksize = 1 << mp->m_sb.sb_blocklog;
/*
* Punch a hole and prealloc the range. We use hole punch rather than
* unwritten extent conversion for two reasons:
*
* 1.) Hole punch handles partial block zeroing for us.
*
* 2.) If prealloc returns ENOSPC, the file range is still zero-valued
* by virtue of the hole punch.
*/
error = xfs_free_file_space(ip, offset, len);
if (error || xfs_is_always_cow_inode(ip))
return error;
return xfs_alloc_file_space(ip, round_down(offset, blksize),
round_up(offset + len, blksize) -
round_down(offset, blksize),
XFS_BMAPI_PREALLOC);
}
static int
xfs_prepare_shift(
struct xfs_inode *ip,

2
fs/xfs/xfs_bmap_util.h
View file

@ -59,8 +59,6 @@ int xfs_alloc_file_space(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t len, int alloc_type);
int xfs_free_file_space(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t len);
int xfs_zero_file_space(struct xfs_inode *ip, xfs_off_t offset,
xfs_off_t len);
int xfs_collapse_file_space(struct xfs_inode *, xfs_off_t offset,
xfs_off_t len);
int xfs_insert_file_space(struct xfs_inode *, xfs_off_t offset,

32
fs/xfs/xfs_file.c
View file

@ -880,16 +880,30 @@ xfs_file_fallocate(
}
if (mode & FALLOC_FL_ZERO_RANGE) {
error = xfs_zero_file_space(ip, offset, len);
/*
* Punch a hole and prealloc the range. We use a hole
* punch rather than unwritten extent conversion for two
* reasons:
*
* 1.) Hole punch handles partial block zeroing for us.
* 2.) If prealloc returns ENOSPC, the file range is
* still zero-valued by virtue of the hole punch.
*/
unsigned int blksize = i_blocksize(inode);
trace_xfs_zero_file_space(ip);
error = xfs_free_file_space(ip, offset, len);
if (error)
goto out_unlock;
len = round_up(offset + len, blksize) -
round_down(offset, blksize);
offset = round_down(offset, blksize);
} else if (mode & FALLOC_FL_UNSHARE_RANGE) {
error = xfs_reflink_unshare(ip, offset, len);
if (error)
goto out_unlock;
if (!xfs_is_always_cow_inode(ip)) {
error = xfs_alloc_file_space(ip, offset, len,
XFS_BMAPI_PREALLOC);
}
} else {
/*
* If always_cow mode we can't use preallocations and
@ -899,12 +913,14 @@ xfs_file_fallocate(
error = -EOPNOTSUPP;
goto out_unlock;
}
}
if (!xfs_is_always_cow_inode(ip)) {
error = xfs_alloc_file_space(ip, offset, len,
XFS_BMAPI_PREALLOC);
if (error)
goto out_unlock;
}
if (error)
goto out_unlock;
}
if (file->f_flags & O_DSYNC)