ext4: Introduce FALLOC_FL_ZERO_RANGE flag for fallocate

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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>

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Lukas Czerner 2014-03-18 18:05:35 -04:00 • committed by Theodore Ts'o

parent 0e8b6879f3

commit b8a8684502

4 changed files with 307 additions and 53 deletions

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2

fs/ext4/ext4.h

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273

fs/ext4/extents.c

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17

fs/ext4/inode.c

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68

include/trace/events/ext4.h

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