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xfs: introduce new internal log vector structure

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The current log IO vector structure is a flat array and not
extensible. To make it possible to keep separate log IO vectors for
individual log items, we need a method of chaining log IO vectors
together.

Introduce a new log vector type that can be used to wrap the
existing log IO vectors on use that internally to the log. This
means that the existing external interface (xfs_log_write) does not
change and hence no changes to the transaction commit code are
required.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Dave Chinner
2010-03-23 11:43:17 +11:00
committed by Alex Elder
parent 99428ad0f6
commit 55b66332d0
2 changed files with 90 additions and 59 deletions
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6
fs/xfs/xfs_log.h
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@@ -110,6 +110,12 @@ typedef struct xfs_log_iovec {
uint i_type; /* type of region */
} xfs_log_iovec_t;
struct xfs_log_vec {
struct xfs_log_vec *lv_next; /* next lv in build list */
int lv_niovecs; /* number of iovecs in lv */
struct xfs_log_iovec *lv_iovecp; /* iovec array */
};
/*
* Structure used to pass callback function and the function's argument
* to the log manager.