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authorDave Chinner <dchinner@redhat.com>2012-11-14 17:54:40 +1100
committerBen Myers <bpm@sgi.com>2012-11-15 21:35:12 -0600
commit1813dd64057490e7a0678a885c4fe6d02f78bdc1 (patch)
treecaf95e2be7881b771da65561b2f1664d73588401 /fs/xfs/xfs_buf.h
parentb0f539de9fcc543a3ffa40bc22bf51aca6ea6183 (diff)
downloadvexpress-lsk-1813dd64057490e7a0678a885c4fe6d02f78bdc1.tar.gz
xfs: convert buffer verifiers to an ops structure.
To separate the verifiers from iodone functions and associate read and write verifiers at the same time, introduce a buffer verifier operations structure to the xfs_buf. This avoids the need for assigning the write verifier, clearing the iodone function and re-running ioend processing in the read verifier, and gets rid of the nasty "b_pre_io" name for the write verifier function pointer. If we ever need to, it will also be easier to add further content specific callbacks to a buffer with an ops structure in place. We also avoid needing to export verifier functions, instead we can simply export the ops structures for those that are needed outside the function they are defined in. This patch also fixes a directory block readahead verifier issue it exposed. This patch also adds ops callbacks to the inode/alloc btree blocks initialised by growfs. These will need more work before they will work with CRCs. Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Phil White <pwhite@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_buf.h')
-rw-r--r--fs/xfs/xfs_buf.h24
1 files changed, 14 insertions, 10 deletions
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 51bc16a1cd9..23f5642480b 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -111,6 +111,11 @@ struct xfs_buf_map {
#define DEFINE_SINGLE_BUF_MAP(map, blkno, numblk) \
struct xfs_buf_map (map) = { .bm_bn = (blkno), .bm_len = (numblk) };
+struct xfs_buf_ops {
+ void (*verify_read)(struct xfs_buf *);
+ void (*verify_write)(struct xfs_buf *);
+};
+
typedef struct xfs_buf {
/*
* first cacheline holds all the fields needed for an uncontended cache
@@ -154,9 +159,7 @@ typedef struct xfs_buf {
unsigned int b_page_count; /* size of page array */
unsigned int b_offset; /* page offset in first page */
unsigned short b_error; /* error code on I/O */
-
- void (*b_pre_io)(struct xfs_buf *);
- /* pre-io callback function */
+ const struct xfs_buf_ops *b_ops;
#ifdef XFS_BUF_LOCK_TRACKING
int b_last_holder;
@@ -199,10 +202,11 @@ struct xfs_buf *xfs_buf_get_map(struct xfs_buftarg *target,
xfs_buf_flags_t flags);
struct xfs_buf *xfs_buf_read_map(struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps,
- xfs_buf_flags_t flags, xfs_buf_iodone_t verify);
+ xfs_buf_flags_t flags,
+ const struct xfs_buf_ops *ops);
void xfs_buf_readahead_map(struct xfs_buftarg *target,
struct xfs_buf_map *map, int nmaps,
- xfs_buf_iodone_t verify);
+ const struct xfs_buf_ops *ops);
static inline struct xfs_buf *
xfs_buf_get(
@@ -221,10 +225,10 @@ xfs_buf_read(
xfs_daddr_t blkno,
size_t numblks,
xfs_buf_flags_t flags,
- xfs_buf_iodone_t verify)
+ const struct xfs_buf_ops *ops)
{
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
- return xfs_buf_read_map(target, &map, 1, flags, verify);
+ return xfs_buf_read_map(target, &map, 1, flags, ops);
}
static inline void
@@ -232,10 +236,10 @@ xfs_buf_readahead(
struct xfs_buftarg *target,
xfs_daddr_t blkno,
size_t numblks,
- xfs_buf_iodone_t verify)
+ const struct xfs_buf_ops *ops)
{
DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
- return xfs_buf_readahead_map(target, &map, 1, verify);
+ return xfs_buf_readahead_map(target, &map, 1, ops);
}
struct xfs_buf *xfs_buf_get_empty(struct xfs_buftarg *target, size_t numblks);
@@ -246,7 +250,7 @@ struct xfs_buf *xfs_buf_get_uncached(struct xfs_buftarg *target, size_t numblks,
int flags);
struct xfs_buf *xfs_buf_read_uncached(struct xfs_buftarg *target,
xfs_daddr_t daddr, size_t numblks, int flags,
- xfs_buf_iodone_t verify);
+ const struct xfs_buf_ops *ops);
void xfs_buf_hold(struct xfs_buf *bp);
/* Releasing Buffers */