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| author | Mark Fasheh | 2007-06-18 19:48:04 +0200 |
|---|---|---|
| committer | Mark Fasheh | 2007-07-11 02:32:00 +0200 |
| commit | 328d5752e1259dfb29b7e65f6c2d145fddbaa750 (patch) | |
| tree | 08198271a0382cafcc4c0de2fc1efcf35cb400af /fs/ocfs2/ocfs2.h | |
| parent | ocfs2: abstract btree growing calls (diff) | |
| download | kernel-qcow2-linux-328d5752e1259dfb29b7e65f6c2d145fddbaa750.tar.gz kernel-qcow2-linux-328d5752e1259dfb29b7e65f6c2d145fddbaa750.tar.xz kernel-qcow2-linux-328d5752e1259dfb29b7e65f6c2d145fddbaa750.zip | |
ocfs2: btree changes for unwritten extents
Writes to a region marked as unwritten might result in a record split or
merge. We can support splits by making minor changes to the existing insert
code. Merges require left rotations which mostly re-use right rotation
support functions.
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2/ocfs2.h')
| -rw-r--r-- | fs/ocfs2/ocfs2.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/fs/ocfs2/ocfs2.h b/fs/ocfs2/ocfs2.h index 648ef8e45eaa..5cc90a40b3c5 100644 --- a/fs/ocfs2/ocfs2.h +++ b/fs/ocfs2/ocfs2.h @@ -306,6 +306,19 @@ static inline int ocfs2_sparse_alloc(struct ocfs2_super *osb) return 0; } +static inline int ocfs2_writes_unwritten_extents(struct ocfs2_super *osb) +{ + /* + * Support for sparse files is a pre-requisite + */ + if (!ocfs2_sparse_alloc(osb)) + return 0; + + if (osb->s_feature_ro_compat & OCFS2_FEATURE_RO_COMPAT_UNWRITTEN) + return 1; + return 0; +} + /* set / clear functions because cluster events can make these happen * in parallel so we want the transitions to be atomic. this also * means that any future flags osb_flags must be protected by spinlock |