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| author | David S. Miller <davem@davemloft.net> | 2016-10-14 10:00:27 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-10-14 10:00:27 -0400 |
| commit | 8eed1cd4cd0c6f41d40c345265f20dc7688ffcca (patch) | |
| tree | 5adaacccdc1e519e3861b8f7333f39350205a472 /include/uapi/linux/falloc.h | |
| parent | 687d911466774808ed4926edadb20cc4f0153bed (diff) | |
| parent | 29fbff8698fc0ac1a1d74584b258e0bf18b469f9 (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'include/uapi/linux/falloc.h')
| -rw-r--r-- | include/uapi/linux/falloc.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/uapi/linux/falloc.h b/include/uapi/linux/falloc.h index 3e445a760f14..b075f601919b 100644 --- a/include/uapi/linux/falloc.h +++ b/include/uapi/linux/falloc.h @@ -58,4 +58,22 @@ */ #define FALLOC_FL_INSERT_RANGE 0x20 +/* + * FALLOC_FL_UNSHARE_RANGE is used to unshare shared blocks within the + * file size without overwriting any existing data. The purpose of this + * call is to preemptively reallocate any blocks that are subject to + * copy-on-write. + * + * 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. + * + * This flag can only be used with allocate-mode fallocate, which is + * to say that it cannot be used with the punch, zero, collapse, or + * insert range modes. + */ +#define FALLOC_FL_UNSHARE_RANGE 0x40 + #endif /* _UAPI_FALLOC_H_ */ |