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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 37/76] cachefiles: trace: Log coherency checks From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet Cc: dhowells@redhat.com, Jeff Layton , Matthew Wilcox , Alexander Viro , linux-cachefs@redhat.com, linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Fri, 20 Nov 2020 15:10:38 +0000 Message-ID: <160588503886.3465195.6396776488623638977.stgit@warthog.procyon.org.uk> In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> References: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Add a cachefiles tracepoint that logs the result of coherency management when the coherency data on a file in the cache is checked or committed. Signed-off-by: David Howells --- fs/cachefiles/xattr.c | 45 ++++++++++++++++++++++-------- include/trace/events/cachefiles.h | 56 +++++++++++++++++++++++++++++++++++++ 2 files changed, 89 insertions(+), 12 deletions(-) diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c index 75a2a6b70e4a..19db19b7d7db 100644 --- a/fs/cachefiles/xattr.c +++ b/fs/cachefiles/xattr.c @@ -125,12 +125,21 @@ int cachefiles_set_object_xattr(struct cachefiles_object *object, ret = vfs_setxattr(dentry, cachefiles_xattr_cache, buf, sizeof(struct cachefiles_xattr) + len, xattr_flags); - kfree(buf); - if (ret < 0 && ret != -ENOMEM) - cachefiles_io_error_obj( - object, - "Failed to set xattr with error %d", ret); + if (ret < 0) { + trace_cachefiles_coherency(object, d_inode(dentry)->i_ino, + 0, + cachefiles_coherency_set_fail); + if (ret != -ENOMEM) + cachefiles_io_error_obj( + object, + "Failed to set xattr with error %d", ret); + } else { + trace_cachefiles_coherency(object, d_inode(dentry)->i_ino, + 0, + cachefiles_coherency_set_ok); + } + kfree(buf); _leave(" = %d", ret); return ret; } @@ -144,7 +153,9 @@ int cachefiles_check_auxdata(struct cachefiles_object *object) struct dentry *dentry = object->dentry; unsigned int len = object->fscache.cookie->aux_len, tlen; const void *p = fscache_get_aux(object->fscache.cookie); - ssize_t ret; + enum cachefiles_coherency_trace why; + ssize_t xlen; + int ret = -ESTALE; ASSERT(dentry); ASSERT(d_backing_inode(dentry)); @@ -154,14 +165,24 @@ int cachefiles_check_auxdata(struct cachefiles_object *object) if (!buf) return -ENOMEM; - ret = vfs_getxattr(dentry, cachefiles_xattr_cache, buf, tlen); - if (ret == tlen && - buf->type == object->fscache.cookie->type && - memcmp(buf->data, p, len) == 0) + xlen = vfs_getxattr(dentry, cachefiles_xattr_cache, buf, tlen); + if (xlen != tlen) { + if (xlen == -EIO) + cachefiles_io_error_obj( + object, + "Failed to read aux with error %zd", xlen); + why = cachefiles_coherency_check_xattr; + } else if (buf->type != object->fscache.cookie->type) { + why = cachefiles_coherency_check_type; + } else if (memcmp(buf->data, p, len) != 0) { + why = cachefiles_coherency_check_aux; + } else { + why = cachefiles_coherency_check_ok; ret = 0; - else - ret = -ESTALE; + } + trace_cachefiles_coherency(object, d_inode(dentry)->i_ino, + 0, why); kfree(buf); return ret; } diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h index 0aa3f3126f6e..bf588c3f4a07 100644 --- a/include/trace/events/cachefiles.h +++ b/include/trace/events/cachefiles.h @@ -24,6 +24,19 @@ enum cachefiles_obj_ref_trace { cachefiles_obj_ref__nr_traces }; +enum cachefiles_coherency_trace { + cachefiles_coherency_check_aux, + cachefiles_coherency_check_content, + cachefiles_coherency_check_dirty, + cachefiles_coherency_check_len, + cachefiles_coherency_check_objsize, + cachefiles_coherency_check_ok, + cachefiles_coherency_check_type, + cachefiles_coherency_check_xattr, + cachefiles_coherency_set_fail, + cachefiles_coherency_set_ok, +}; + #endif /* @@ -56,6 +69,18 @@ enum cachefiles_obj_ref_trace { EM(cachefiles_obj_put_wait_retry, "PUT wait_retry") \ E_(cachefiles_obj_put_wait_timeo, "PUT wait_timeo") +#define cachefiles_coherency_traces \ + EM(cachefiles_coherency_check_aux, "BAD aux ") \ + EM(cachefiles_coherency_check_content, "BAD cont") \ + EM(cachefiles_coherency_check_dirty, "BAD dirt") \ + EM(cachefiles_coherency_check_len, "BAD len ") \ + EM(cachefiles_coherency_check_objsize, "BAD osiz") \ + EM(cachefiles_coherency_check_ok, "OK ") \ + EM(cachefiles_coherency_check_type, "BAD type") \ + EM(cachefiles_coherency_check_xattr, "BAD xatt") \ + EM(cachefiles_coherency_set_fail, "SET fail") \ + E_(cachefiles_coherency_set_ok, "SET ok ") + /* * Export enum symbols via userspace. */ @@ -66,6 +91,7 @@ enum cachefiles_obj_ref_trace { cachefiles_obj_kill_traces; cachefiles_obj_ref_traces; +cachefiles_coherency_traces; /* * Now redefine the EM() and E_() macros to map the enums to the strings that @@ -295,6 +321,36 @@ TRACE_EVENT(cachefiles_mark_buried, __print_symbolic(__entry->why, cachefiles_obj_kill_traces)) ); +TRACE_EVENT(cachefiles_coherency, + TP_PROTO(struct cachefiles_object *obj, + ino_t ino, + int content, + enum cachefiles_coherency_trace why), + + TP_ARGS(obj, ino, content, why), + + /* Note that obj may be NULL */ + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(enum cachefiles_coherency_trace, why ) + __field(int, content ) + __field(u64, ino ) + ), + + TP_fast_assign( + __entry->obj = obj->fscache.debug_id; + __entry->why = why; + __entry->content = content; + __entry->ino = ino; + ), + + TP_printk("o=%08x %s i=%llx c=%u", + __entry->obj, + __print_symbolic(__entry->why, cachefiles_coherency_traces), + __entry->ino, + __entry->content) + ); + #endif /* _TRACE_CACHEFILES_H */ /* This part must be outside protection */