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authorChristoph Hellwig <hch@infradead.org>2008-10-30 16:56:32 +1100
committerLachlan McIlroy <lachlan@sgi.com>2008-10-30 16:56:32 +1100
commit278d0ca14e889c3932a05d1a68675252a12b3466 (patch)
treea228d171d4aded60b27639e30eca1bf58ed7daa6 /fs/xfs/xfs_alloc.c
parent38bb74237d2d94c1aced2ec626d7d0f317e360da (diff)
downloadop-kernel-dev-278d0ca14e889c3932a05d1a68675252a12b3466.zip
op-kernel-dev-278d0ca14e889c3932a05d1a68675252a12b3466.tar.gz
[XFS] implement generic xfs_btree_update
From: Dave Chinner <dgc@sgi.com> The most complicated part here is the lastrec tracking for the alloc btree. Most logic is in the update_lastrec method which has to do some hopefully good enough dirty magic to maintain it. [hch: split out from bigger patch and a rework of the lastrec logic] SGI-PV: 985583 SGI-Modid: xfs-linux-melb:xfs-kern:32194a Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Bill O'Donnell <billodo@sgi.com> Signed-off-by: David Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_alloc.c')
-rw-r--r--fs/xfs/xfs_alloc.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/xfs/xfs_alloc.c b/fs/xfs/xfs_alloc.c
index 6bda0ae..875e1ba 100644
--- a/fs/xfs/xfs_alloc.c
+++ b/fs/xfs/xfs_alloc.c
@@ -136,6 +136,23 @@ xfs_alloc_lookup_le(
return xfs_btree_lookup(cur, XFS_LOOKUP_LE, stat);
}
+/*
+ * Update the record referred to by cur to the value given
+ * by [bno, len].
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+STATIC int /* error */
+xfs_alloc_update(
+ struct xfs_btree_cur *cur, /* btree cursor */
+ xfs_agblock_t bno, /* starting block of extent */
+ xfs_extlen_t len) /* length of extent */
+{
+ union xfs_btree_rec rec;
+
+ rec.alloc.ar_startblock = cpu_to_be32(bno);
+ rec.alloc.ar_blockcount = cpu_to_be32(len);
+ return xfs_btree_update(cur, &rec);
+}
/*
* Compute aligned version of the found extent.
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