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Btrfs: Improve FL_KEEP_SIZE handling in fallocate 

- 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>
hifive-unleashed-5.1
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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9
fs/btrfs/file.c
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@ -2682,9 +2682,12 @@ static long btrfs_fallocate(struct file *file, int mode,
return ret;
inode_lock(inode);
ret = inode_newsize_ok(inode, alloc_end);
if (ret)
goto out;
if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size) {
ret = inode_newsize_ok(inode, offset + len);
if (ret)
goto out;
}
/*
* TODO: Move these two operations after we have checked