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[XFS] implement generic xfs_btree_update

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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>
This commit is contained in:
Christoph Hellwig
2008-10-30 16:56:32 +11:00
committed by Lachlan McIlroy
parent 38bb74237d
commit 278d0ca14e
11 changed files with 230 additions and 184 deletions
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14
fs/xfs/xfs_btree.h
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@@ -187,6 +187,12 @@ struct xfs_btree_ops {
/* cursor operations */
struct xfs_btree_cur *(*dup_cursor)(struct xfs_btree_cur *);
/* update last record information */
void (*update_lastrec)(struct xfs_btree_cur *cur,
struct xfs_btree_block *block,
union xfs_btree_rec *rec,
int ptr, int reason);
/* records in block/level */
int (*get_maxrecs)(struct xfs_btree_cur *cur, int level);
@@ -220,6 +226,12 @@ struct xfs_btree_ops {
#endif
};
/*
* Reasons for the update_lastrec method to be called.
*/
#define LASTREC_UPDATE 0
/*
* Btree cursor structure.
* This collects all information needed by the btree code in one place.
@@ -264,6 +276,7 @@ typedef struct xfs_btree_cur
/* cursor flags */
#define XFS_BTREE_LONG_PTRS (1<<0) /* pointers are 64bits long */
#define XFS_BTREE_ROOT_IN_INODE (1<<1) /* root may be variable size */
#define XFS_BTREE_LASTREC_UPDATE (1<<2) /* track last rec externally */
#define XFS_BTREE_NOERROR 0
@@ -519,6 +532,7 @@ int xfs_btree_increment(struct xfs_btree_cur *, int, int *);
int xfs_btree_decrement(struct xfs_btree_cur *, int, int *);
int xfs_btree_lookup(struct xfs_btree_cur *, xfs_lookup_t, int *);
int xfs_btree_updkey(struct xfs_btree_cur *, union xfs_btree_key *, int);
int xfs_btree_update(struct xfs_btree_cur *, union xfs_btree_rec *);
/*
* Helpers.