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scoutfs: add super block format and args

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Add macros which provide printk format and args for a little string
which identifies a specific mount.  This will be used in kernel logs and
trace messages.

Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2019-06-21 15:13:16 -07:00
committed by Zach Brown
parent b147d74967
commit 7acbf4cc8b
1 changed files with 34 additions and 0 deletions
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34
kmod/src/super.h
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@@ -91,6 +91,40 @@ static inline struct scoutfs_sb_info *SCOUTFS_SB(struct super_block *sb)
return sb->s_fs_info;
}
static inline bool SCOUTFS_HAS_SBI(struct super_block *sb)
{
return (sb != NULL) && (SCOUTFS_SB(sb) != NULL);
}
/*
* A small string embedded in messages that's used to identify a
* specific mount. It's the three most significant bytes of the fsid
* and the rid. That gives us a strong chance of avoiding collisions
* with typical numbers of mounts. We give it a bit of structure to
* make it searchable and to be able to identify format changes, should
* we need to. The fsid will be 0 until the super has been read and the
* fsid discovered.
*/
#define SCSBF "f.%.06x.r.%.06x"
#define SCSB_SHIFT (64 - (8 * 3))
#define SCSB_LEFR_ARGS(fsid, rid) \
(int)(le64_to_cpu(fsid) >> SCSB_SHIFT), \
(int)(le64_to_cpu(rid) >> SCSB_SHIFT)
#define SCSB_ARGS(sb) \
(int)(le64_to_cpu(SCOUTFS_SB(sb)->super.hdr.fsid) >> SCSB_SHIFT), \
(int)(SCOUTFS_SB(sb)->rid >> SCSB_SHIFT)
#define SCSB_TRACE_FIELDS \
__field(__u64, fsid) \
__field(__u64, rid)
#define SCSB_TRACE_ASSIGN(sb) \
__entry->fsid = SCOUTFS_HAS_SBI(sb) ? \
le64_to_cpu(SCOUTFS_SB(sb)->super.hdr.fsid) : 0;\
__entry->rid = SCOUTFS_HAS_SBI(sb) ? \
SCOUTFS_SB(sb)->rid : 0;
#define SCSB_TRACE_ARGS \
(int)(__entry->fsid >> SCSB_SHIFT), \
(int)(__entry->rid >> SCSB_SHIFT)
int scoutfs_read_super(struct super_block *sb,
struct scoutfs_super_block *super_res);
void scoutfs_advance_dirty_super(struct super_block *sb);