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btrfs: Drop EXTENT_UPTODATE check in hole punching and direct locking

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In these instances, we are trying to determine if a page has been accessed
since we began the operation for the sake of retry.  This is easily
accomplished by doing a gang lookup in the page mapping radix tree, and it
saves us the dependency on the flag (so that we might eventually delete
it).

btrfs_page_exists_in_range borrows heavily from find_get_page, replacing
the radix tree look up with a gang lookup of 1, so that we can find the
next highest page >= index and see if it falls into our lock range.

Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Alex Gartrell <agartrell@fb.com>
This commit is contained in:
Alex Gartrell
2014-05-20 13:07:56 -07:00
committed by Chris Mason
parent 0e378df15c
commit fc4adbff82
3 changed files with 71 additions and 7 deletions
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fs/btrfs/btrfs_inode.h
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@@ -284,4 +284,6 @@ static inline void btrfs_inode_resume_unlocked_dio(struct inode *inode)
&BTRFS_I(inode)->runtime_flags);
}
bool btrfs_page_exists_in_range(struct inode *inode, loff_t start, loff_t end);
#endif