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cachefiles: Trace active-mark failure 

Add a tracepoint to log failure to apply an active mark to a file in
addition to tracing successfully setting and unsetting the mark.

Also include the backing file inode number in the message logged to dmesg.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/164251404666.3435901.17331742792401482190.stgit@warthog.procyon.org.uk/ # v1
This commit is contained in:
David Howells 2022-01-14 11:05:13 +00:00
parent 8c39b8bc82
commit b64a331498
2 changed files with 24 additions and 1 deletions
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4
fs/cachefiles/namei.c
View File

@ -25,7 +25,9 @@ static bool __cachefiles_mark_inode_in_use(struct cachefiles_object *object,
trace_cachefiles_mark_active(object, inode);
can_use = true;
} else {
pr_notice("cachefiles: Inode already in use: %pd\n", dentry);
trace_cachefiles_mark_failed(object, inode);
pr_notice("cachefiles: Inode already in use: %pd (B=%lx)\n",
dentry, inode->i_ino);
}
return can_use;

21
include/trace/events/cachefiles.h
View File

@ -573,6 +573,27 @@ TRACE_EVENT(cachefiles_mark_active,
__entry->obj, __entry->inode)
);
TRACE_EVENT(cachefiles_mark_failed,
TP_PROTO(struct cachefiles_object *obj,
struct inode *inode),
TP_ARGS(obj, inode),
/* Note that obj may be NULL */
TP_STRUCT__entry(
__field(unsigned int, obj )
__field(ino_t, inode )
),
TP_fast_assign(
__entry->obj = obj ? obj->debug_id : 0;
__entry->inode = inode->i_ino;
),
TP_printk("o=%08x B=%lx",
__entry->obj, __entry->inode)
);
TRACE_EVENT(cachefiles_mark_inactive,
TP_PROTO(struct cachefiles_object *obj,
struct inode *inode),