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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 28/67] cachefiles: Trace truncations From: David Howells To: linux-cachefs@redhat.com Cc: dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , 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: Mon, 18 Oct 2021 15:57:42 +0100 Message-ID: <163456906284.2614702.7451773731985568258.stgit@warthog.procyon.org.uk> In-Reply-To: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> References: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org Add a tracepoint to trace truncation operations. Signed-off-by: David Howells --- fs/cachefiles/interface.c | 9 +++++++- include/trace/events/cachefiles.h | 40 +++++++++++++++++++++++++++++++++++++ 2 files changed, 48 insertions(+), 1 deletion(-) diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c index 4edb3a09932a..8f98e5c27d66 100644 --- a/fs/cachefiles/interface.c +++ b/fs/cachefiles/interface.c @@ -341,9 +341,16 @@ static void cachefiles_invalidate_object(struct cachefiles_object *object) ASSERT(d_is_reg(file->f_path.dentry)); cachefiles_begin_secure(cache, &saved_cred); + trace_cachefiles_trunc(object, file_inode(file), + i_size_read(file_inode(file)), 0, + cachefiles_trunc_invalidate); ret = vfs_truncate(&file->f_path, 0); - if (ret == 0) + if (ret == 0) { + trace_cachefiles_trunc(object, file_inode(file), + 0, ni_size, + cachefiles_trunc_set_size); ret = vfs_truncate(&file->f_path, ni_size); + } cachefiles_end_secure(cache, saved_cred); if (ret != 0) { diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h index 6e9f6462833d..09d76c160451 100644 --- a/include/trace/events/cachefiles.h +++ b/include/trace/events/cachefiles.h @@ -37,6 +37,11 @@ enum cachefiles_coherency_trace { cachefiles_coherency_set_ok, }; +enum cachefiles_trunc_trace { + cachefiles_trunc_invalidate, + cachefiles_trunc_set_size, +}; + #endif /* @@ -72,6 +77,10 @@ enum cachefiles_coherency_trace { EM(cachefiles_coherency_set_fail, "SET fail") \ E_(cachefiles_coherency_set_ok, "SET ok ") +#define cachefiles_trunc_traces \ + EM(cachefiles_trunc_invalidate, "INVAL ") \ + E_(cachefiles_trunc_set_size, "SETSIZ") + /* * Export enum symbols via userspace. */ @@ -83,6 +92,7 @@ enum cachefiles_coherency_trace { cachefiles_obj_kill_traces; cachefiles_obj_ref_traces; cachefiles_coherency_traces; +cachefiles_trunc_traces; /* * Now redefine the EM() and E_() macros to map the enums to the strings that @@ -292,6 +302,36 @@ TRACE_EVENT(cachefiles_coherency, __entry->content) ); +TRACE_EVENT(cachefiles_trunc, + TP_PROTO(struct cachefiles_object *obj, struct inode *backer, + loff_t from, loff_t to, enum cachefiles_trunc_trace why), + + TP_ARGS(obj, backer, from, to, why), + + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(unsigned int, backer ) + __field(enum cachefiles_trunc_trace, why ) + __field(loff_t, from ) + __field(loff_t, to ) + ), + + TP_fast_assign( + __entry->obj = obj->debug_id; + __entry->backer = backer->i_ino; + __entry->from = from; + __entry->to = to; + __entry->why = why; + ), + + TP_printk("o=%08x b=%08x %s l=%llx->%llx", + __entry->obj, + __entry->backer, + __print_symbolic(__entry->why, cachefiles_trunc_traces), + __entry->from, + __entry->to) + ); + #endif /* _TRACE_CACHEFILES_H */ /* This part must be outside protection */