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Btrfs: add a comment explaining what btrfs_cont_expand does

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Everytime I have to deal with btrfs_cont_expand I stare at it for 20 minutes
trying to remember what exactly it does and why the hell we need it.  So add a
comment to save future-Josef some time.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2011-03-04 15:46:53 -05:00
parent 930f028abe
commit 695a0d0da0
1 changed files with 6 additions and 0 deletions
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6
fs/btrfs/inode.c
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@ -3557,6 +3557,12 @@ out:
return ret; return ret;
} }
/*
* This function puts in dummy file extents for the area we're creating a hole
* for. So if we are truncating this file to a larger size we need to insert
* these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
* the range between oldsize and size
*/
int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
{ {
struct btrfs_trans_handle *trans; struct btrfs_trans_handle *trans;