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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2016-10-03 18:11:43 +0200 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2016-10-06 01:26:26 +0200 |
| commit | 98cc2db5b8b2c9f38aebf54a7b03657406b6de26 (patch) | |
| tree | 2cac01aab4083ea3e9c3dae5ee7665a16e923190 /fs/xfs/xfs_file.c | |
| parent | xfs: swap inode reflink flags when swapping inode extents (diff) | |
| download | linux-98cc2db5b8b2c9f38aebf54a7b03657406b6de26.tar.xz linux-98cc2db5b8b2c9f38aebf54a7b03657406b6de26.zip | |
xfs: unshare a range of blocks via fallocate
Unshare all shared extents if the user calls fallocate with the new
unshare mode flag set, so that we can guarantee that a subsequent
write will not ENOSPC.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
[hch: pass inode instead of file to xfs_reflink_dirty_range,
use iomap infrastructure for copy up]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs/xfs_file.c')
| -rw-r--r-- | fs/xfs/xfs_file.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 39fde9f51303..07f951dd2685 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -848,7 +848,7 @@ buffered: #define XFS_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \ - FALLOC_FL_INSERT_RANGE) + FALLOC_FL_INSERT_RANGE | FALLOC_FL_UNSHARE_RANGE) STATIC long xfs_file_fallocate( @@ -938,9 +938,15 @@ xfs_file_fallocate( if (mode & FALLOC_FL_ZERO_RANGE) error = xfs_zero_file_space(ip, offset, len); - else + else { + if (mode & FALLOC_FL_UNSHARE_RANGE) { + error = xfs_reflink_unshare(ip, offset, len); + if (error) + goto out_unlock; + } error = xfs_alloc_file_space(ip, offset, len, XFS_BMAPI_PREALLOC); + } if (error) goto out_unlock; } |