Btrfs: Improve FL_KEEP_SIZE handling in fallocate

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- We call inode_size_ok() only if FL_KEEP_SIZE isn't specified.
- As an optimisation we can skip the call if (off + len)
  isn't greater than the current size of the file. This operation
  is called under the lock so the less work we do, the better.
- If we call inode_size_ok() pass to it the correct value rather
  than a more conservative estimation.

Signed-off-by: Davide Italiano <dccitaliano@gmail.com>
Reviewed-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Davide Italiano 2015-04-06 22:09:15 -07:00 • committed by David Sterba

parent 232cad8413

commit 2a162ce932

1 changed files with 6 additions and 3 deletions

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fs/btrfs/file.c

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