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iomap: trace iomap_appply results

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Add some tracepoints so that we can more easily debug what the
filesystem is returning from ->iomap_begin.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2019-11-21 16:14:49 -08:00
parent e9f930ac88
commit 6334b91e50
2 changed files with 110 additions and 0 deletions
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7
fs/iomap/apply.c
View File

@ -7,6 +7,7 @@
#include <linux/compiler.h>
#include <linux/fs.h>
#include <linux/iomap.h>
#include "trace.h"
/*
* Execute a iomap write on a segment of the mapping that spans a
@ -28,6 +29,8 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
loff_t written = 0, ret;
u64 end;
trace_iomap_apply(inode, pos, length, flags, ops, actor, _RET_IP_);
/*
* Need to map a range from start position for length bytes. This can
* span multiple pages - it is only guaranteed to return a range of a
@ -48,6 +51,10 @@ iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
if (WARN_ON(iomap.length == 0))
return -EIO;
trace_iomap_apply_dstmap(inode, &iomap);
if (srcmap.type != IOMAP_HOLE)
trace_iomap_apply_srcmap(inode, &srcmap);
/*
* Cut down the length to the one actually provided by the filesystem,
* as it might not be able to give us the whole size that we requested.

103
fs/iomap/trace.h
View File

@ -80,6 +80,109 @@ DEFINE_PAGE_EVENT(iomap_writepage);
DEFINE_PAGE_EVENT(iomap_releasepage);
DEFINE_PAGE_EVENT(iomap_invalidatepage);
#define IOMAP_TYPE_STRINGS \
{ IOMAP_HOLE, "HOLE" }, \
{ IOMAP_DELALLOC, "DELALLOC" }, \
{ IOMAP_MAPPED, "MAPPED" }, \
{ IOMAP_UNWRITTEN, "UNWRITTEN" }, \
{ IOMAP_INLINE, "INLINE" }
#define IOMAP_FLAGS_STRINGS \
{ IOMAP_WRITE, "WRITE" }, \
{ IOMAP_ZERO, "ZERO" }, \
{ IOMAP_REPORT, "REPORT" }, \
{ IOMAP_FAULT, "FAULT" }, \
{ IOMAP_DIRECT, "DIRECT" }, \
{ IOMAP_NOWAIT, "NOWAIT" }
#define IOMAP_F_FLAGS_STRINGS \
{ IOMAP_F_NEW, "NEW" }, \
{ IOMAP_F_DIRTY, "DIRTY" }, \
{ IOMAP_F_SHARED, "SHARED" }, \
{ IOMAP_F_MERGED, "MERGED" }, \
{ IOMAP_F_BUFFER_HEAD, "BH" }, \
{ IOMAP_F_SIZE_CHANGED, "SIZE_CHANGED" }
DECLARE_EVENT_CLASS(iomap_class,
TP_PROTO(struct inode *inode, struct iomap *iomap),
TP_ARGS(inode, iomap),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(u64, ino)
__field(u64, addr)
__field(loff_t, offset)
__field(u64, length)
__field(u16, type)
__field(u16, flags)
__field(dev_t, bdev)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->addr = iomap->addr;
__entry->offset = iomap->offset;
__entry->length = iomap->length;
__entry->type = iomap->type;
__entry->flags = iomap->flags;
__entry->bdev = iomap->bdev ? iomap->bdev->bd_dev : 0;
),
TP_printk("dev %d:%d ino 0x%llx bdev %d:%d addr %lld offset %lld "
"length %llu type %s flags %s",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->ino,
MAJOR(__entry->bdev), MINOR(__entry->bdev),
__entry->addr,
__entry->offset,
__entry->length,
__print_symbolic(__entry->type, IOMAP_TYPE_STRINGS),
__print_flags(__entry->flags, "|", IOMAP_F_FLAGS_STRINGS))
)
#define DEFINE_IOMAP_EVENT(name) \
DEFINE_EVENT(iomap_class, name, \
TP_PROTO(struct inode *inode, struct iomap *iomap), \
TP_ARGS(inode, iomap))
DEFINE_IOMAP_EVENT(iomap_apply_dstmap);
DEFINE_IOMAP_EVENT(iomap_apply_srcmap);
TRACE_EVENT(iomap_apply,
TP_PROTO(struct inode *inode, loff_t pos, loff_t length,
unsigned int flags, const void *ops, void *actor,
unsigned long caller),
TP_ARGS(inode, pos, length, flags, ops, actor, caller),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(u64, ino)
__field(loff_t, pos)
__field(loff_t, length)
__field(unsigned int, flags)
__field(const void *, ops)
__field(void *, actor)
__field(unsigned long, caller)
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
__entry->pos = pos;
__entry->length = length;
__entry->flags = flags;
__entry->ops = ops;
__entry->actor = actor;
__entry->caller = caller;
),
TP_printk("dev %d:%d ino 0x%llx pos %lld length %lld flags %s (0x%x) "
"ops %ps caller %pS actor %ps",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->ino,
__entry->pos,
__entry->length,
__print_flags(__entry->flags, "|", IOMAP_FLAGS_STRINGS),
__entry->flags,
__entry->ops,
(void *)__entry->caller,
__entry->actor)
);
#endif /* _IOMAP_TRACE_H */
#undef TRACE_INCLUDE_PATH