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 /include/uapi/linux/falloc.h | |
| 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 'include/uapi/linux/falloc.h')
| -rw-r--r-- | include/uapi/linux/falloc.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h index 51398fa57f6c..326597f54087 100644 --- a/include/uapi/linux/falloc.h +++ b/include/uapi/linux/falloc.h @@ -2,6 +2,14 @@ #ifndef _UAPI_FALLOC_H_ #define _UAPI_FALLOC_H_ +/* + * FALLOC_FL_MAP_FREE_SPACE maps all the free physical space in the + * filesystem into the file at the same offsets. This flag requires + * CAP_SYS_ADMIN, and cannot be used with any other flags. It probably + * only works on filesystems that are backed by physical media. + */ +#define FALLOC_FL_MAP_FREE_SPACE 0x8000 + #define FALLOC_FL_KEEP_SIZE 0x01 /* default is extend size */ #define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */ #define FALLOC_FL_NO_HIDE_STALE 0x04 /* reserved codepoint */ |