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author | Dave Chinner <david@fromorbit.com> | 2014-03-13 19:11:06 +1100 |
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committer | Dave Chinner <david@fromorbit.com> | 2014-03-13 19:11:06 +1100 |
commit | b6db0551fddfc8826bc07fc99d64d830530b2d77 (patch) | |
tree | adcd5566fc810e29888622208b5afe8c566d0f89 /include | |
parent | 027f185e66eb24e2ea291ff3b93c1e4bd07b85b4 (diff) | |
parent | 376ba313147b4172f3e8cf620b9fb591f3e8cdfa (diff) | |
download | linux-b6db0551fddfc8826bc07fc99d64d830530b2d77.tar.gz |
Merge branch 'xfs-collapse-range' into for-next
Diffstat (limited to 'include')
-rw-r--r-- | include/uapi/linux/falloc.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h index 990c4ccf8b61..d1197ae3723c 100644 --- a/include/uapi/linux/falloc.h +++ b/include/uapi/linux/falloc.h @@ -5,5 +5,40 @@ #define FALLOC_FL_PUNCH_HOLE 0x02 /* de-allocates range */ #define FALLOC_FL_NO_HIDE_STALE 0x04 /* reserved codepoint */ +/* + * FALLOC_FL_COLLAPSE_RANGE is used to remove a range of a file + * without leaving a hole in the file. The contents of the file beyond + * the range being removed is appended to the start offset of the range + * being removed (i.e. the hole that was punched is "collapsed"), + * resulting in a file layout that looks like the range that was + * removed never existed. As such collapsing a range of a file changes + * the size of the file, reducing it by the same length of the range + * that has been removed by the operation. + * + * Different filesystems may implement different limitations on the + * granularity of the operation. Most will limit operations to + * filesystem block size boundaries, but this boundary may be larger or + * smaller depending on the filesystem and/or the configuration of the + * filesystem or file. + * + * Attempting to collapse a range that crosses the end of the file is + * considered an illegal operation - just use ftruncate(2) if you need + * to collapse a range that crosses EOF. + */ +#define FALLOC_FL_COLLAPSE_RANGE 0x08 + +/* + * FALLOC_FL_ZERO_RANGE is used to convert a range of file to zeros preferably + * without issuing data IO. Blocks should be preallocated for the regions that + * span holes in the file, and the entire range is preferable converted to + * unwritten extents - even though file system may choose to zero out the + * extent or do whatever which will result in reading zeros from the range + * while the range remains allocated for the file. + * + * This can be also used to preallocate blocks past EOF in the same way as + * with fallocate. Flag FALLOC_FL_KEEP_SIZE should cause the inode + * size to remain the same. + */ +#define FALLOC_FL_ZERO_RANGE 0x10 #endif /* _UAPI_FALLOC_H_ */ |