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cachefiles: Add auxiliary data trace

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Add a display of the first 8 bytes of the downloaded auxiliary data and of
the on-disk stored auxiliary data as these are used in coherency
management.  In the case of afs, this holds the data version number.

Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://lore.kernel.org/r/20241108173236.1382366-19-dhowells@redhat.com
cc: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
David Howells 2024-11-08 17:32:19 +00:00 committed by Christian Brauner
parent 46e6646ae7
commit f2304d8fef
No known key found for this signature in database
GPG Key ID: 91C61BC06578DCA2
2 changed files with 18 additions and 4 deletions
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9
fs/cachefiles/xattr.c
View File

@ -77,6 +77,7 @@ int cachefiles_set_object_xattr(struct cachefiles_object *object)
trace_cachefiles_vfs_error(object, file_inode(file), ret,
cachefiles_trace_setxattr_error);
trace_cachefiles_coherency(object, file_inode(file)->i_ino,
be64_to_cpup((__be64 *)buf->data),
buf->content,
cachefiles_coherency_set_fail);
if (ret != -ENOMEM)
@ -85,6 +86,7 @@ int cachefiles_set_object_xattr(struct cachefiles_object *object)
"Failed to set xattr with error %d", ret);
} else {
trace_cachefiles_coherency(object, file_inode(file)->i_ino,
be64_to_cpup((__be64 *)buf->data),
buf->content,
cachefiles_coherency_set_ok);
}
@ -126,7 +128,10 @@ int cachefiles_check_auxdata(struct cachefiles_object *object, struct file *file
object,
"Failed to read aux with error %zd", xlen);
why = cachefiles_coherency_check_xattr;
} else if (buf->type != CACHEFILES_COOKIE_TYPE_DATA) {
goto out;
}
if (buf->type != CACHEFILES_COOKIE_TYPE_DATA) {
why = cachefiles_coherency_check_type;
} else if (memcmp(buf->data, p, len) != 0) {
why = cachefiles_coherency_check_aux;
@ -141,7 +146,9 @@ int cachefiles_check_auxdata(struct cachefiles_object *object, struct file *file
ret = 0;
}
out:
trace_cachefiles_coherency(object, file_inode(file)->i_ino,
be64_to_cpup((__be64 *)buf->data),
buf->content, why);
kfree(buf);
return ret;

13
include/trace/events/cachefiles.h
View File

@ -380,10 +380,11 @@ TRACE_EVENT(cachefiles_rename,
TRACE_EVENT(cachefiles_coherency,
TP_PROTO(struct cachefiles_object *obj,
ino_t ino,
u64 disk_aux,
enum cachefiles_content content,
enum cachefiles_coherency_trace why),
TP_ARGS(obj, ino, content, why),
TP_ARGS(obj, ino, disk_aux, content, why),
/* Note that obj may be NULL */
TP_STRUCT__entry(
@ -391,6 +392,8 @@ TRACE_EVENT(cachefiles_coherency,
__field(enum cachefiles_coherency_trace, why )
__field(enum cachefiles_content, content )
__field(u64, ino )
__field(u64, aux )
__field(u64, disk_aux)
),
TP_fast_assign(
@ -398,13 +401,17 @@ TRACE_EVENT(cachefiles_coherency,
__entry->why = why;
__entry->content = content;
__entry->ino = ino;
__entry->aux = be64_to_cpup((__be64 *)obj->cookie->inline_aux);
__entry->disk_aux = disk_aux;
),
TP_printk("o=%08x %s B=%llx c=%u",
TP_printk("o=%08x %s B=%llx c=%u aux=%llx dsk=%llx",
__entry->obj,
__print_symbolic(__entry->why, cachefiles_coherency_traces),
__entry->ino,
__entry->content)
__entry->content,
__entry->aux,
__entry->disk_aux)
);
TRACE_EVENT(cachefiles_vol_coherency,