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smtp.kernel.org (Postfix) with ESMTPSA id 8CB23C433C7; Wed, 13 Dec 2023 15:59:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702483170; bh=NVRL/fDht99d/3/hGQWgSHztLyoyEkuj97VDxS89bQY=; h=Subject:From:To:Cc:Date:In-Reply-To:References:From; b=adtVZGglHLMeDHL4qn+WLkrh394serfA83EWwlLUdSOiiD+OkGu/MnOsKc35dCQSF YAPJ+H8smQLB09oTs/fyb4+cUCnc7Be3kyNu7CsEtsnayIWnlVFBy5VYlEmZOEj/wa 8A9Y8NUgz7rxtsXwSmnjhaj9l3CNXG/GW8sIrfh9h9ikgWTNH3RpyPSa6rWmWUdvd9 YaTfQV5UAdbhN/ice7Rcf62QNj5Hdk4Jwb9NArsn1i/hzdKXGmrOAjnaeH7FY7ciSe DP7xcCtKpaNlsgblFKCxZYQSzZYPaIjI+X8o7OhcyJMrqrh+GwC99jiysVmR51mIfI u81zI6NKdFlEQ== Message-ID: <66ca4a047eb24a5bd28c36f68202bb6509131a71.camel@kernel.org> Subject: Re: [PATCH v4 06/39] netfs: Add a procfile to list in-progress requests From: Jeff Layton To: David Howells , Steve French Cc: Matthew Wilcox , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Dominique Martinet , Eric Van Hensbergen , Ilya Dryomov , Christian 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 R7kzeWNd tvSEZa3+hqCiy0GgB3aBU6otZZhiscjadL4Sp1hxgf9E2+ECUsxBUr+gvU/tGBW+NoG+s3Iv3tkUQE23y606181K9ZNX1xZ8Y6G6dwQRpGNaDqEh4MBRsVXFusK+Ngv260fLiaTnCXBaaenhQfK2KB0U/aoFv95aTnI2vHOjh1EXHA0C6JCsdn7JSL4PqIdZLM3quLGIBEBvBsuH/odMTNc2xCMBoSFr1nsMCqsNMqfO16URkuSasJHDiUxLKBeYSN8/GuETg7YUdaORrqBtpTCYVun6L5n3bNmq95+F7rnxBc7JDMjThMyOEXJ0z/T/FfkGiXq9yu6nq8f0= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, 2023-12-13 at 15:23 +0000, David Howells wrote: > Add a procfile, /proc/fs/netfs/requests, to list in-progress netfslib I/O > requests. >=20 This should probably be in debugfs. I could see us wanting to improve this interface over time. That's harder with procfs but with debugfs we'd have carte blanche to do so. > Signed-off-by: David Howells > cc: Jeff Layton > cc: linux-cachefs@redhat.com > cc: linux-fsdevel@vger.kernel.org > cc: linux-mm@kvack.org > --- > fs/netfs/internal.h | 22 ++++++++++++++ > fs/netfs/main.c | 69 ++++++++++++++++++++++++++++++++++++++++++- > fs/netfs/objects.c | 4 ++- > include/linux/netfs.h | 6 +++- > 4 files changed, 98 insertions(+), 3 deletions(-) >=20 > diff --git a/fs/netfs/internal.h b/fs/netfs/internal.h > index a15fe67e1db7..937d9a22f178 100644 > --- a/fs/netfs/internal.h > +++ b/fs/netfs/internal.h > @@ -33,6 +33,28 @@ int netfs_begin_read(struct netfs_io_request *rreq, bo= ol sync); > * main.c > */ > extern unsigned int netfs_debug; > +extern struct list_head netfs_io_requests; > +extern spinlock_t netfs_proc_lock; > + > +#ifdef CONFIG_PROC_FS > +static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq) > +{ > + spin_lock(&netfs_proc_lock); > + list_add_tail_rcu(&rreq->proc_link, &netfs_io_requests); > + spin_unlock(&netfs_proc_lock); > +} > +static inline void netfs_proc_del_rreq(struct netfs_io_request *rreq) > +{ > + if (!list_empty(&rreq->proc_link)) { > + spin_lock(&netfs_proc_lock); > + list_del_rcu(&rreq->proc_link); > + spin_unlock(&netfs_proc_lock); > + } > +} > +#else > +static inline void netfs_proc_add_rreq(struct netfs_io_request *rreq) {} > +static inline void netfs_proc_del_rreq(struct netfs_io_request *rreq) {} > +#endif > =20 > /* > * objects.c > diff --git a/fs/netfs/main.c b/fs/netfs/main.c > index c9af6e0896d3..97ce1436615b 100644 > --- a/fs/netfs/main.c > +++ b/fs/netfs/main.c > @@ -21,13 +21,80 @@ unsigned netfs_debug; > module_param_named(debug, netfs_debug, uint, S_IWUSR | S_IRUGO); > MODULE_PARM_DESC(netfs_debug, "Netfs support debugging mask"); > =20 > +#ifdef CONFIG_PROC_FS > +LIST_HEAD(netfs_io_requests); > +DEFINE_SPINLOCK(netfs_proc_lock); > + > +static const char *netfs_origins[] =3D { > + [NETFS_READAHEAD] =3D "RA", > + [NETFS_READPAGE] =3D "RP", > + [NETFS_READ_FOR_WRITE] =3D "RW", > +}; > + > +/* > + * Generate a list of I/O requests in /proc/fs/netfs/requests > + */ > +static int netfs_requests_seq_show(struct seq_file *m, void *v) > +{ > + struct netfs_io_request *rreq; > + > + if (v =3D=3D &netfs_io_requests) { > + seq_puts(m, > + "REQUEST OR REF FL ERR OPS COVERAGE\n" > + "=3D=3D=3D=3D=3D=3D=3D=3D =3D=3D =3D=3D=3D =3D=3D =3D=3D=3D=3D =3D= =3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D\n" > + ); > + return 0; > + } > + > + rreq =3D list_entry(v, struct netfs_io_request, proc_link); > + seq_printf(m, > + "%08x %s %3d %2lx %4d %3d @%04llx %zx/%zx", > + rreq->debug_id, > + netfs_origins[rreq->origin], > + refcount_read(&rreq->ref), > + rreq->flags, > + rreq->error, > + atomic_read(&rreq->nr_outstanding), > + rreq->start, rreq->submitted, rreq->len); > + seq_putc(m, '\n'); > + return 0; > +} > + > +static void *netfs_requests_seq_start(struct seq_file *m, loff_t *_pos) > + __acquires(rcu) > +{ > + rcu_read_lock(); > + return seq_list_start_head(&netfs_io_requests, *_pos); > +} > + > +static void *netfs_requests_seq_next(struct seq_file *m, void *v, loff_t= *_pos) > +{ > + return seq_list_next(v, &netfs_io_requests, _pos); > +} > + > +static void netfs_requests_seq_stop(struct seq_file *m, void *v) > + __releases(rcu) > +{ > + rcu_read_unlock(); > +} > + > +static const struct seq_operations netfs_requests_seq_ops =3D { > + .start =3D netfs_requests_seq_start, > + .next =3D netfs_requests_seq_next, > + .stop =3D netfs_requests_seq_stop, > + .show =3D netfs_requests_seq_show, > +}; > +#endif /* CONFIG_PROC_FS */ > + > static int __init netfs_init(void) > { > int ret =3D -ENOMEM; > =20 > if (!proc_mkdir("fs/netfs", NULL)) > goto error; > - > + if (!proc_create_seq("fs/netfs/requests", S_IFREG | 0444, NULL, > + &netfs_requests_seq_ops)) > + goto error_proc; > #ifdef CONFIG_FSCACHE_STATS > if (!proc_create_single("fs/netfs/stats", S_IFREG | 0444, NULL, > netfs_stats_show)) > diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c > index e17cdf53f6a7..85f428fc52e6 100644 > --- a/fs/netfs/objects.c > +++ b/fs/netfs/objects.c > @@ -45,6 +45,7 @@ struct netfs_io_request *netfs_alloc_request(struct add= ress_space *mapping, > } > } > =20 > + netfs_proc_add_rreq(rreq); > netfs_stat(&netfs_n_rh_rreq); > return rreq; > } > @@ -76,12 +77,13 @@ static void netfs_free_request(struct work_struct *wo= rk) > container_of(work, struct netfs_io_request, work); > =20 > trace_netfs_rreq(rreq, netfs_rreq_trace_free); > + netfs_proc_del_rreq(rreq); > netfs_clear_subrequests(rreq, false); > if (rreq->netfs_ops->free_request) > rreq->netfs_ops->free_request(rreq); > if (rreq->cache_resources.ops) > rreq->cache_resources.ops->end_operation(&rreq->cache_resources); > - kfree(rreq); > + kfree_rcu(rreq, rcu); > netfs_stat_d(&netfs_n_rh_rreq); > } > =20 > diff --git a/include/linux/netfs.h b/include/linux/netfs.h > index 32faf6c89702..7244ddebd974 100644 > --- a/include/linux/netfs.h > +++ b/include/linux/netfs.h > @@ -175,10 +175,14 @@ enum netfs_io_origin { > * operations to a variety of data stores and then stitch the result tog= ether. > */ > struct netfs_io_request { > - struct work_struct work; > + union { > + struct work_struct work; > + struct rcu_head rcu; > + }; > struct inode *inode; /* The file being accessed */ > struct address_space *mapping; /* The mapping being accessed */ > struct netfs_cache_resources cache_resources; > + struct list_head proc_link; /* Link in netfs_iorequests */ > struct list_head subrequests; /* Contributory I/O operations */ > void *netfs_priv; /* Private data for the netfs */ > unsigned int debug_id; >=20 --=20 Jeff Layton