[RFC,43/53] cifs: Replace cifs_readdata with a wrapper around netfs_io_subrequest

Message ID	20231013160423.2218093-44-dhowells@redhat.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-cifs-owner@vger.kernel.org> From: David Howells <dhowells@redhat.com> To: Jeff Layton <jlayton@kernel.org>, Steve French <smfrench@gmail.com> Cc: David Howells <dhowells@redhat.com>, Matthew Wilcox <willy@infradead.org>, Marc Dionne <marc.dionne@auristor.com>, Paulo Alcantara <pc@manguebit.com>, Shyam Prasad N <sprasad@microsoft.com>, Tom Talpey <tom@talpey.com>, Dominique Martinet <asmadeus@codewreck.org>, Ilya Dryomov <idryomov@gmail.com>, Christian Brauner <christian@brauner.io>, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Steve French <sfrench@samba.org>, Shyam Prasad N <nspmangalore@gmail.com>, Rohith Surabattula <rohiths.msft@gmail.com>, linux-cachefs@redhat.com Subject: [RFC PATCH 43/53] cifs: Replace cifs_readdata with a wrapper around netfs_io_subrequest Date: Fri, 13 Oct 2023 17:04:12 +0100 Message-ID: <20231013160423.2218093-44-dhowells@redhat.com> In-Reply-To: <20231013160423.2218093-1-dhowells@redhat.com> References: <20231013160423.2218093-1-dhowells@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	netfs, afs, cifs: Delegate high-level I/O to netfslib \| expand [RFC,00/53] netfs, afs, cifs: Delegate high-level I/O to netfslib [RFC,01/53] netfs: Add a procfile to list in-progress requests [RFC,02/53] netfs: Track the fpos above which the server has no data [RFC,03/53] netfs: Note nonblockingness in the netfs_io_request struct [RFC,04/53] netfs: Allow the netfs to make the io (sub)request alloc larger [RFC,05/53] netfs: Add a ->free_subrequest() op [RFC,06/53] afs: Don't use folio->private to record partial modification [RFC,07/53] netfs: Provide invalidate_folio and release_folio calls [RFC,08/53] netfs: Add rsize to netfs_io_request [RFC,09/53] netfs: Implement unbuffered/DIO vs buffered I/O locking [RFC,10/53] netfs: Add iov_iters to (sub)requests to describe various buffers [RFC,11/53] netfs: Add support for DIO buffering [RFC,12/53] netfs: Provide tools to create a buffer in an xarray [RFC,13/53] netfs: Add bounce buffering support [RFC,14/53] netfs: Add func to calculate pagecount/size-limited span of an iterator [RFC,15/53] netfs: Limit subrequest by size or number of segments [RFC,16/53] netfs: Export netfs_put_subrequest() and some tracepoints [RFC,17/53] netfs: Extend the netfs_io_*request structs to handle writes [RFC,18/53] netfs: Add a hook to allow tell the netfs to update its i_size [RFC,19/53] netfs: Make netfs_put_request() handle a NULL pointer [RFC,20/53] fscache: Add a function to begin an cache op from a netfslib request [RFC,21/53] netfs: Make the refcounting of netfs_begin_read() easier to use [RFC,22/53] netfs: Prep to use folio->private for write grouping and streaming write [RFC,23/53] netfs: Dispatch write requests to process a writeback slice [RFC,24/53] netfs: Provide func to copy data to pagecache for buffered write [RFC,25/53] netfs: Make netfs_read_folio() handle streaming-write pages [RFC,26/53] netfs: Allocate multipage folios in the writepath [RFC,27/53] netfs: Implement support for unbuffered/DIO read [RFC,28/53] netfs: Implement unbuffered/DIO write support [RFC,29/53] netfs: Implement buffered write API [RFC,30/53] netfs: Allow buffered shared-writeable mmap through netfs_page_mkwrite() [RFC,31/53] netfs: Provide netfs_file_read_iter() [RFC,32/53] netfs: Provide a writepages implementation [RFC,33/53] netfs: Provide minimum blocksize parameter [RFC,34/53] netfs: Make netfs_skip_folio_read() take account of blocksize [RFC,35/53] netfs: Perform content encryption [RFC,36/53] netfs: Decrypt encrypted content [RFC,37/53] netfs: Support decryption on ubuffered/DIO read [RFC,38/53] netfs: Support encryption on Unbuffered/DIO write [RFC,39/53] netfs: Provide a launder_folio implementation [RFC,40/53] netfs: Implement a write-through caching option [RFC,41/53] netfs: Rearrange netfs_io_subrequest to put request pointer first [RFC,42/53] afs: Use the netfs write helpers [RFC,43/53] cifs: Replace cifs_readdata with a wrapper around netfs_io_subrequest [RFC,44/53] cifs: Share server EOF pos with netfslib [RFC,45/53] cifs: Replace cifs_writedata with a wrapper around netfs_io_subrequest [RFC,46/53] cifs: Use more fields from netfs_io_subrequest [RFC,47/53] cifs: Make wait_mtu_credits take size_t args [RFC,48/53] cifs: Implement netfslib hooks [RFC,49/53] cifs: Move cifs_loose_read_iter() and cifs_file_write_iter() to file.c [RFC,50/53] cifs: Cut over to using netfslib [RFC,51/53] cifs: Remove some code that's no longer used, part 1 [RFC,52/53] cifs: Remove some code that's no longer used, part 2 [RFC,53/53] cifs: Remove some code that's no longer used, part 3

diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index 02082621d8e0..22fa98428845 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -237,7 +237,7 @@ struct dfs_info3_param; struct cifs_fattr; struct smb3_fs_context; struct cifs_fid; -struct cifs_readdata; +struct cifs_io_subrequest; struct cifs_writedata; struct cifs_io_parms; struct cifs_search_info; @@ -411,7 +411,7 @@ struct smb_version_operations { /* send a flush request to the server */ int (*flush)(const unsigned int, struct cifs_tcon *, struct cifs_fid *); /* async read from the server */ - int (*async_readv)(struct cifs_readdata *); + int (*async_readv)(struct cifs_io_subrequest *); /* async write to the server */ int (*async_writev)(struct cifs_writedata *, void (*release)(struct kref *)); @@ -1423,26 +1423,28 @@ struct cifs_aio_ctx { }; /* asynchronous read support */ -struct cifs_readdata { - struct kref refcount; - struct list_head list; - struct completion done; +struct cifs_io_subrequest { + struct netfs_io_subrequest subreq; struct cifsFileInfo *cfile; struct address_space *mapping; struct cifs_aio_ctx *ctx; - __u64 offset; ssize_t got_bytes; - unsigned int bytes; pid_t pid; int result; - struct work_struct work; - struct iov_iter iter; struct kvec iov[2]; struct TCP_Server_Info *server; #ifdef CONFIG_CIFS_SMB_DIRECT struct smbd_mr *mr; #endif struct cifs_credits credits; + + // TODO: Remove following elements + struct list_head list; + struct completion done; + struct work_struct work; + struct iov_iter iter; + __u64 offset; + unsigned int bytes; }; /* asynchronous write support */ diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h index 0c37eefa18a5..7748fe148fb4 100644 --- a/fs/smb/client/cifsproto.h +++ b/fs/smb/client/cifsproto.h @@ -580,8 +580,13 @@ void __cifs_put_smb_ses(struct cifs_ses *ses); extern struct cifs_ses * cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb3_fs_context *ctx); -void cifs_readdata_release(struct kref *refcount); -int cifs_async_readv(struct cifs_readdata *rdata); +void cifs_readdata_release(struct cifs_io_subrequest *rdata); +static inline void cifs_put_readdata(struct cifs_io_subrequest *rdata) +{ + if (refcount_dec_and_test(&rdata->subreq.ref)) + cifs_readdata_release(rdata); +} +int cifs_async_readv(struct cifs_io_subrequest *rdata); int cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid); int cifs_async_writev(struct cifs_writedata *wdata, diff --git a/fs/smb/client/cifssmb.c b/fs/smb/client/cifssmb.c index 25503f1a4fd2..76005b3d5ffe 100644 --- a/fs/smb/client/cifssmb.c +++ b/fs/smb/client/cifssmb.c @@ -24,6 +24,8 @@ #include <linux/swap.h> #include <linux/task_io_accounting_ops.h> #include <linux/uaccess.h> +#include <linux/netfs.h> +#include <trace/events/netfs.h> #include "cifspdu.h" #include "cifsfs.h" #include "cifsglob.h" @@ -1260,12 +1262,11 @@ CIFS_open(const unsigned int xid, struct cifs_open_parms *oparms, int *oplock, static void cifs_readv_callback(struct mid_q_entry *mid) { - struct cifs_readdata *rdata = mid->callback_data; + struct cifs_io_subrequest *rdata = mid->callback_data; struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); struct TCP_Server_Info *server = tcon->ses->server; struct smb_rqst rqst = { .rq_iov = rdata->iov, .rq_nvec = 2, - .rq_iter_size = iov_iter_count(&rdata->iter), .rq_iter = rdata->iter }; struct cifs_credits credits = { .value = 1, .instance = 0 }; @@ -1310,7 +1311,7 @@ cifs_readv_callback(struct mid_q_entry *mid) /* cifs_async_readv - send an async write, and set up mid to handle result */ int -cifs_async_readv(struct cifs_readdata *rdata) +cifs_async_readv(struct cifs_io_subrequest *rdata) { int rc; READ_REQ *smb = NULL; @@ -1362,15 +1363,11 @@ cifs_async_readv(struct cifs_readdata *rdata) rdata->iov[1].iov_base = (char *)smb + 4; rdata->iov[1].iov_len = get_rfc1002_length(smb); - kref_get(&rdata->refcount); rc = cifs_call_async(tcon->ses->server, &rqst, cifs_readv_receive, cifs_readv_callback, NULL, rdata, 0, NULL); if (rc == 0) cifs_stats_inc(&tcon->stats.cifs_stats.num_reads); - else - kref_put(&rdata->refcount, cifs_readdata_release); - cifs_small_buf_release(smb); return rc; } diff --git a/fs/smb/client/file.c b/fs/smb/client/file.c index 2108b3b40ce9..b4f16ef62115 100644 --- a/fs/smb/client/file.c +++ b/fs/smb/client/file.c @@ -2950,7 +2950,7 @@ static int cifs_writepages_region(struct address_space *mapping, continue; } - folio_batch_release(&fbatch); + folio_batch_release(&fbatch); cond_resched(); } while (wbc->nr_to_write > 0); @@ -3784,13 +3784,13 @@ cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) return written; } -static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete) +static struct cifs_io_subrequest *cifs_readdata_alloc(work_func_t complete) { - struct cifs_readdata *rdata; + struct cifs_io_subrequest *rdata; rdata = kzalloc(sizeof(*rdata), GFP_KERNEL); if (rdata) { - kref_init(&rdata->refcount); + refcount_set(&rdata->subreq.ref, 1); INIT_LIST_HEAD(&rdata->list); init_completion(&rdata->done); INIT_WORK(&rdata->work, complete); @@ -3800,11 +3800,8 @@ static struct cifs_readdata *cifs_readdata_alloc(work_func_t complete) } void -cifs_readdata_release(struct kref *refcount) +cifs_readdata_release(struct cifs_io_subrequest *rdata) { - struct cifs_readdata *rdata = container_of(refcount, - struct cifs_readdata, refcount); - if (rdata->ctx) kref_put(&rdata->ctx->refcount, cifs_aio_ctx_release); #ifdef CONFIG_CIFS_SMB_DIRECT @@ -3824,16 +3821,16 @@ static void collect_uncached_read_data(struct cifs_aio_ctx *ctx); static void cifs_uncached_readv_complete(struct work_struct *work) { - struct cifs_readdata *rdata = container_of(work, - struct cifs_readdata, work); + struct cifs_io_subrequest *rdata = + container_of(work, struct cifs_io_subrequest, work); complete(&rdata->done); collect_uncached_read_data(rdata->ctx); /* the below call can possibly free the last ref to aio ctx */ - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); } -static int cifs_resend_rdata(struct cifs_readdata *rdata, +static int cifs_resend_rdata(struct cifs_io_subrequest *rdata, struct list_head *rdata_list, struct cifs_aio_ctx *ctx) { @@ -3901,7 +3898,7 @@ static int cifs_resend_rdata(struct cifs_readdata *rdata, } while (rc == -EAGAIN); fail: - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); return rc; } @@ -3910,7 +3907,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file, struct cifs_sb_info *cifs_sb, struct list_head *rdata_list, struct cifs_aio_ctx *ctx) { - struct cifs_readdata *rdata; + struct cifs_io_subrequest *rdata; unsigned int rsize, nsegs, max_segs = INT_MAX; struct cifs_credits credits_on_stack; struct cifs_credits *credits = &credits_on_stack; @@ -3978,7 +3975,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file, rdata->ctx = ctx; kref_get(&ctx->refcount); - rdata->iter = ctx->iter; + rdata->iter = ctx->iter; iov_iter_truncate(&rdata->iter, cur_len); rc = adjust_credits(server, &rdata->credits, rdata->bytes); @@ -3992,7 +3989,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file, if (rc) { add_credits_and_wake_if(server, &rdata->credits, 0); - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); if (rc == -EAGAIN) continue; break; @@ -4010,7 +4007,7 @@ cifs_send_async_read(loff_t fpos, size_t len, struct cifsFileInfo *open_file, static void collect_uncached_read_data(struct cifs_aio_ctx *ctx) { - struct cifs_readdata *rdata, *tmp; + struct cifs_io_subrequest *rdata, *tmp; struct cifs_sb_info *cifs_sb; int rc; @@ -4056,8 +4053,7 @@ collect_uncached_read_data(struct cifs_aio_ctx *ctx) rdata->cfile, cifs_sb, &tmp_list, ctx); - kref_put(&rdata->refcount, - cifs_readdata_release); + cifs_put_readdata(rdata); } list_splice(&tmp_list, &ctx->list); @@ -4073,7 +4069,7 @@ collect_uncached_read_data(struct cifs_aio_ctx *ctx) ctx->total_len += rdata->got_bytes; } list_del_init(&rdata->list); - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); } /* mask nodata case */ @@ -4445,8 +4441,8 @@ static void cifs_unlock_folios(struct address_space *mapping, pgoff_t first, pgo static void cifs_readahead_complete(struct work_struct *work) { - struct cifs_readdata *rdata = container_of(work, - struct cifs_readdata, work); + struct cifs_io_subrequest *rdata = container_of(work, + struct cifs_io_subrequest, work); struct folio *folio; pgoff_t last; bool good = rdata->result == 0 || (rdata->result == -EAGAIN && rdata->got_bytes); @@ -4472,7 +4468,7 @@ static void cifs_readahead_complete(struct work_struct *work) } rcu_read_unlock(); - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); } static void cifs_readahead(struct readahead_control *ractl) @@ -4512,7 +4508,7 @@ static void cifs_readahead(struct readahead_control *ractl) */ while ((nr_pages = ra_pages)) { unsigned int i, rsize; - struct cifs_readdata *rdata; + struct cifs_io_subrequest *rdata; struct cifs_credits credits_on_stack; struct cifs_credits *credits = &credits_on_stack; struct folio *folio; @@ -4631,11 +4627,11 @@ static void cifs_readahead(struct readahead_control *ractl) rdata->offset / PAGE_SIZE, (rdata->offset + rdata->bytes - 1) / PAGE_SIZE); /* Fallback to the readpage in error/reconnect cases */ - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); break; } - kref_put(&rdata->refcount, cifs_readdata_release); + cifs_put_readdata(rdata); } free_xid(xid); diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 9aeecee6b91b..dc18130db9b3 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -4584,7 +4584,7 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid, unsigned int cur_off; unsigned int cur_page_idx; unsigned int pad_len; - struct cifs_readdata *rdata = mid->callback_data; + struct cifs_io_subrequest *rdata = mid->callback_data; struct smb2_hdr *shdr = (struct smb2_hdr *)buf; int length; bool use_rdma_mr = false; diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index c75a80bb6d9e..cc3d80a66869 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -23,6 +23,8 @@ #include <linux/uuid.h> #include <linux/pagemap.h> #include <linux/xattr.h> +#include <linux/netfs.h> +#include <trace/events/netfs.h> #include "cifsglob.h" #include "cifsacl.h" #include "cifsproto.h" @@ -4070,7 +4072,7 @@ static inline bool smb3_use_rdma_offload(struct cifs_io_parms *io_parms) */ static int smb2_new_read_req(void **buf, unsigned int *total_len, - struct cifs_io_parms *io_parms, struct cifs_readdata *rdata, + struct cifs_io_parms *io_parms, struct cifs_io_subrequest *rdata, unsigned int remaining_bytes, int request_type) { int rc = -EACCES; @@ -4162,13 +4164,14 @@ smb2_new_read_req(void **buf, unsigned int *total_len, static void smb2_readv_callback(struct mid_q_entry *mid) { - struct cifs_readdata *rdata = mid->callback_data; + struct cifs_io_subrequest *rdata = mid->callback_data; struct cifs_tcon *tcon = tlink_tcon(rdata->cfile->tlink); struct TCP_Server_Info *server = rdata->server; struct smb2_hdr *shdr = (struct smb2_hdr *)rdata->iov[0].iov_base; struct cifs_credits credits = { .value = 0, .instance = 0 }; - struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], .rq_nvec = 1 }; + struct smb_rqst rqst = { .rq_iov = &rdata->iov[1], + .rq_nvec = 1 }; if (rdata->got_bytes) { rqst.rq_iter = rdata->iter; @@ -4249,7 +4252,7 @@ smb2_readv_callback(struct mid_q_entry *mid) /* smb2_async_readv - send an async read, and set up mid to handle result */ int -smb2_async_readv(struct cifs_readdata *rdata) +smb2_async_readv(struct cifs_io_subrequest *rdata) { int rc, flags = 0; char *buf; @@ -4307,13 +4310,11 @@ smb2_async_readv(struct cifs_readdata *rdata) flags |= CIFS_HAS_CREDITS; } - kref_get(&rdata->refcount); rc = cifs_call_async(server, &rqst, cifs_readv_receive, smb2_readv_callback, smb3_handle_read_data, rdata, flags, &rdata->credits); if (rc) { - kref_put(&rdata->refcount, cifs_readdata_release); cifs_stats_fail_inc(io_parms.tcon, SMB2_READ_HE); trace_smb3_read_err(0 /* xid */, io_parms.persistent_fid, io_parms.tcon->tid, diff --git a/fs/smb/client/smb2proto.h b/fs/smb/client/smb2proto.h index 46eff9ec302a..02ffe5ec9b21 100644 --- a/fs/smb/client/smb2proto.h +++ b/fs/smb/client/smb2proto.h @@ -186,7 +186,7 @@ extern int SMB2_query_acl(const unsigned int xid, struct cifs_tcon *tcon, extern int SMB2_get_srv_num(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid, u64 volatile_fid, __le64 *uniqueid); -extern int smb2_async_readv(struct cifs_readdata *rdata); +extern int smb2_async_readv(struct cifs_io_subrequest *rdata); extern int SMB2_read(const unsigned int xid, struct cifs_io_parms *io_parms, unsigned int *nbytes, char **buf, int *buf_type); extern int smb2_async_writev(struct cifs_writedata *wdata, diff --git a/fs/smb/client/transport.c b/fs/smb/client/transport.c index 14710afdc2a3..16d87867ef50 100644 --- a/fs/smb/client/transport.c +++ b/fs/smb/client/transport.c @@ -1686,7 +1686,7 @@ __cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid, static int cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid) { - struct cifs_readdata *rdata = mid->callback_data; + struct cifs_io_subrequest *rdata = mid->callback_data; return __cifs_readv_discard(server, mid, rdata->result); } @@ -1696,7 +1696,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid) { int length, len; unsigned int data_offset, data_len; - struct cifs_readdata *rdata = mid->callback_data; + struct cifs_io_subrequest *rdata = mid->callback_data; char *buf = server->smallbuf; unsigned int buflen = server->pdu_size + HEADER_PREAMBLE_SIZE(server); bool use_rdma_mr = false;

[RFC,43/53] cifs: Replace cifs_readdata with a wrapper around netfs_io_subrequest

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