diff options
| author | Darrick J. Wong <djwong@kernel.org> | 2021-09-01 11:25:39 -0700 |
|---|---|---|
| committer | Darrick J. Wong <djwong@kernel.org> | 2021-12-15 17:29:29 -0800 |
| commit | 9ce7cdaa061e17128626e0b880adfed00455931d (patch) | |
| tree | fb53e2ea4d95e13a23e512f19d15dc8f78d77c55 /fs/open.c | |
| parent | b68950039f7467e0f1e439cfa144211b23b9dc61 (diff) | |
xfs: fallocate free space into a file
Add a new fallocate mode to map free physical space into a file, at the
same file offset as if the file were a sparse image of the physical
device backing the filesystem. The intent here is to use this to
prototype a free space defragmentation tool.
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Diffstat (limited to 'fs/open.c')
| -rw-r--r-- | fs/open.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/open.c b/fs/open.c index f732fb94600c..0b56adadb986 100644 --- a/fs/open.c +++ b/fs/open.c @@ -261,6 +261,11 @@ int vfs_fallocate(struct file *file, int mode, loff_t offset, loff_t len) (mode & ~(FALLOC_FL_UNSHARE_RANGE | FALLOC_FL_KEEP_SIZE))) return -EINVAL; + /* Mapping free space should only be used by itself. */ + if ((mode & FALLOC_FL_MAP_FREE_SPACE) && + (mode & ~FALLOC_FL_MAP_FREE_SPACE)) + return -EINVAL; + if (!(file->f_mode & FMODE_WRITE)) return -EBADF; |