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[XFS] sanitize xlog_in_core_t definition

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Move all fields from xlog_iclog_fields_t into xlog_in_core_t instead of having
them in a substructure and the using #defines to make it look like they were
directly in xlog_in_core_t.  Also document that xlog_in_core_2_t is grossly
misnamed, and make all references to it typesafe.

(First sent on Semptember 15th)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
This commit is contained in:
Christoph Hellwig
2008-11-28 14:23:38 +11:00
committed by Niv Sardi
parent 4805621a37
commit b28708d6a0
3 changed files with 19 additions and 46 deletions
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46
fs/xfs/xfs_log_priv.h
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@ -310,6 +310,16 @@ typedef struct xlog_rec_ext_header {
} xlog_rec_ext_header_t;
#ifdef __KERNEL__
/*
* Quite misnamed, because this union lays out the actual on-disk log buffer.
*/
typedef union xlog_in_core2 {
xlog_rec_header_t hic_header;
xlog_rec_ext_header_t hic_xheader;
char hic_sector[XLOG_HEADER_SIZE];
} xlog_in_core_2_t;
/*
* - A log record header is 512 bytes. There is plenty of room to grow the
* xlog_rec_header_t into the reserved space.
@ -339,7 +349,7 @@ typedef struct xlog_rec_ext_header {
* We'll put all the read-only and l_icloglock fields in the first cacheline,
* and move everything else out to subsequent cachelines.
*/
typedef struct xlog_iclog_fields {
typedef struct xlog_in_core {
sv_t ic_force_wait;
sv_t ic_write_wait;
struct xlog_in_core *ic_next;
@ -362,40 +372,10 @@ typedef struct xlog_iclog_fields {
/* reference counts need their own cacheline */
atomic_t ic_refcnt ____cacheline_aligned_in_smp;
} xlog_iclog_fields_t;
typedef union xlog_in_core2 {
xlog_rec_header_t hic_header;
xlog_rec_ext_header_t hic_xheader;
char hic_sector[XLOG_HEADER_SIZE];
} xlog_in_core_2_t;
typedef struct xlog_in_core {
xlog_iclog_fields_t hic_fields;
xlog_in_core_2_t *hic_data;
xlog_in_core_2_t *ic_data;
#define ic_header ic_data->hic_header
} xlog_in_core_t;
/*
* Defines to save our code from this glop.
*/
#define ic_force_wait hic_fields.ic_force_wait
#define ic_write_wait hic_fields.ic_write_wait
#define ic_next hic_fields.ic_next
#define ic_prev hic_fields.ic_prev
#define ic_bp hic_fields.ic_bp
#define ic_log hic_fields.ic_log
#define ic_callback hic_fields.ic_callback
#define ic_callback_lock hic_fields.ic_callback_lock
#define ic_callback_tail hic_fields.ic_callback_tail
#define ic_trace hic_fields.ic_trace
#define ic_size hic_fields.ic_size
#define ic_offset hic_fields.ic_offset
#define ic_refcnt hic_fields.ic_refcnt
#define ic_bwritecnt hic_fields.ic_bwritecnt
#define ic_state hic_fields.ic_state
#define ic_datap hic_fields.ic_datap
#define ic_header hic_data->hic_header
/*
* The reservation head lsn is not made up of a cycle number and block number.
* Instead, it uses a cycle number and byte number. Logs don't expect to