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| author | Lukas Czerner <lczerner@redhat.com> | 2014-03-18 18:05:35 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2014-03-18 18:05:35 -0400 |
| commit | b8a8684502a0fc852afa0056c6bb2a9273f6fcc0 (patch) | |
| tree | 3b7c2058c86f5247a31e02e1a04182c40775e268 /fs/ext4/ext4.h | |
| parent | 0e8b6879f3c234036181526683be2b0231892ae4 (diff) | |
| download | lwn-b8a8684502a0fc852afa0056c6bb2a9273f6fcc0.tar.gz lwn-b8a8684502a0fc852afa0056c6bb2a9273f6fcc0.zip | |
ext4: Introduce FALLOC_FL_ZERO_RANGE flag for fallocate
Introduce new FALLOC_FL_ZERO_RANGE flag for fallocate. This has the same
functionality as xfs ioctl XFS_IOC_ZERO_RANGE.
It can be 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
This can be also used to preallocate blocks past EOF in the same way as
with fallocate. Flag FALLOC_FL_KEEP_SIZE which should cause the inode
size to remain the same.
Also add appropriate tracepoints.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/ext4.h')
| -rw-r--r-- | fs/ext4/ext4.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index beec42750a8c..1b3cbf8cacf9 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -568,6 +568,8 @@ enum { #define EXT4_GET_BLOCKS_NO_LOCK 0x0100 /* Do not put hole in extent cache */ #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200 + /* Convert written extents to unwritten */ +#define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400 /* * The bit position of these flags must not overlap with any of the |