From patchwork Mon Mar 31 13:33:13 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Zhaolong X-Patchwork-Id: 14033618 Received: from szxga08-in.huawei.com (szxga08-in.huawei.com [45.249.212.255]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E55A1DFE0A; Mon, 31 Mar 2025 13:39:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.255 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743428364; cv=none; b=BoPZ3TqGnP0IPEYgGfYQAO0EVD3oXetXW1fn0puHAgZmCNxV1T6UkbOW3iAQCV83todHYIN3ax1VZrZ4sA7TO4vJTInyuzssZ66e/zjqW1FHKmifwxuEJskAH7CzJVGpThRhkhLxqYT/mygXf6XCvOWepWexWSyqBmNh+2++Tm8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743428364; c=relaxed/simple; bh=dOx95MuekbEMi2IU+RmUOmcI3GSosGWmUni5Knb+IqQ=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=BUFv2ft3lcb5Twc+D7NVfFPW4A2RYb4DhM4ZAOhqY6DbLxnhCvRpZserxH9WUKpChUnXXyiWLMzzagjQ+PGR8TWrUsVsArtWbrR0/UfJc7HdPrcObdVs5lPwu9FvE0edfn4R6LQ0U6Blcyo6M2j0xFTWVIPt00U0iagXajZyIno= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.255 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.105]) by szxga08-in.huawei.com (SkyGuard) with ESMTP id 4ZRBzs4LrNz1d14d; Mon, 31 Mar 2025 21:38:49 +0800 (CST) Received: from kwepemg500010.china.huawei.com (unknown [7.202.181.71]) by mail.maildlp.com (Postfix) with ESMTPS id DAB1B1400DC; Mon, 31 Mar 2025 21:39:18 +0800 (CST) Received: from huawei.com (10.175.104.67) by kwepemg500010.china.huawei.com (7.202.181.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 31 Mar 2025 21:39:17 +0800 From: Wang Zhaolong To: , CC: , , , , , , Subject: [PATCH next 1/3] smb:client: smb: client: Add reverse mapping from tcon to superblocks Date: Mon, 31 Mar 2025 21:33:13 +0800 Message-ID: <20250331133315.117666-2-wangzhaolong1@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250331133315.117666-1-wangzhaolong1@huawei.com> References: <20250331133315.117666-1-wangzhaolong1@huawei.com> Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemg500010.china.huawei.com (7.202.181.71) Currently, when a SMB connection is reset and renegotiated with the server, there's no way to update all related mount points with new negotiated sizes. This is because while superblocks (cifs_sb_info) maintain references to tree connections (tcon) through tcon_link structures, there is no reverse mapping from a tcon back to all the superblocks using it. This patch adds a bidirectional relationship between tcon and cifs_sb_info structures by: 1. Adding a cifs_sb_list to tcon structure with appropriate locking 2. Adding tcon_sb_link to cifs_sb_info to join the list 3. Managing the list entries during mount and umount operations The bidirectional relationship enables future functionality to locate and update all superblocks connected to a specific tree connection, such as: - Updating negotiated parameters after reconnection - Efficiently notifying all affected mounts of capability changes This is the first part of a series to improve connection resilience by keeping all mount parameters in sync with server capabilities after reconnection. Signed-off-by: Wang Zhaolong --- fs/smb/client/cifs_fs_sb.h | 1 + fs/smb/client/cifsglob.h | 3 ++- fs/smb/client/connect.c | 15 +++++++++++++++ fs/smb/client/misc.c | 2 ++ 4 files changed, 20 insertions(+), 1 deletion(-) diff --git a/fs/smb/client/cifs_fs_sb.h b/fs/smb/client/cifs_fs_sb.h index 651759192280..5e8d163cb5f8 100644 --- a/fs/smb/client/cifs_fs_sb.h +++ b/fs/smb/client/cifs_fs_sb.h @@ -47,10 +47,11 @@ #define CIFS_MOUNT_RW_CACHE 0x40000000 /* assumes only client accessing */ #define CIFS_MOUNT_SHUTDOWN 0x80000000 struct cifs_sb_info { struct rb_root tlink_tree; + struct list_head tcon_sb_link; spinlock_t tlink_tree_lock; struct tcon_link *master_tlink; struct nls_table *local_nls; struct smb3_fs_context *ctx; atomic_t active; diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index cddeb2adbf4a..be1760ceca6c 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -1317,11 +1317,12 @@ struct cifs_tcon { struct fscache_volume *fscache; /* cookie for share */ struct mutex fscache_lock; /* Prevent regetting a cookie */ #endif struct list_head pending_opens; /* list of incomplete opens */ struct cached_fids *cfids; - /* BB add field for back pointer to sb struct(s)? */ + struct list_head cifs_sb_list; + spinlock_t sb_list_lock; #ifdef CONFIG_CIFS_DFS_UPCALL struct delayed_work dfs_cache_work; struct list_head dfs_ses_list; #endif struct delayed_work query_interfaces; /* query interfaces workqueue job */ diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 73f93a35eedd..409b4e0dac26 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -3336,10 +3336,11 @@ void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon, int cifs_setup_cifs_sb(struct cifs_sb_info *cifs_sb) { struct smb3_fs_context *ctx = cifs_sb->ctx; INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks); + INIT_LIST_HEAD(&cifs_sb->tcon_sb_link); spin_lock_init(&cifs_sb->tlink_tree_lock); cifs_sb->tlink_tree = RB_ROOT; cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n", @@ -3568,10 +3569,14 @@ static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses, cifs_sb->master_tlink = tlink; spin_lock(&cifs_sb->tlink_tree_lock); tlink_rb_insert(&cifs_sb->tlink_tree, tlink); spin_unlock(&cifs_sb->tlink_tree_lock); + spin_lock(&tcon->sb_list_lock); + list_add(&cifs_sb->tcon_sb_link, &tcon->cifs_sb_list); + spin_unlock(&tcon->sb_list_lock); + queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks, TLINK_IDLE_EXPIRE); return 0; } @@ -3909,13 +3914,23 @@ void cifs_umount(struct cifs_sb_info *cifs_sb) { struct rb_root *root = &cifs_sb->tlink_tree; struct rb_node *node; struct tcon_link *tlink; + struct cifs_tcon *tcon = NULL; cancel_delayed_work_sync(&cifs_sb->prune_tlinks); + if (cifs_sb->master_tlink) { + tcon = cifs_sb->master_tlink->tl_tcon; + if (tcon) { + spin_lock(&tcon->sb_list_lock); + list_del_init(&cifs_sb->tcon_sb_link); + spin_unlock(&tcon->sb_list_lock); + } + } + spin_lock(&cifs_sb->tlink_tree_lock); while ((node = rb_first(root))) { tlink = rb_entry(node, struct tcon_link, tl_rbnode); cifs_get_tlink(tlink); clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); diff --git a/fs/smb/client/misc.c b/fs/smb/client/misc.c index b328dc5c7988..7b6ed9b23e71 100644 --- a/fs/smb/client/misc.c +++ b/fs/smb/client/misc.c @@ -135,12 +135,14 @@ tcon_info_alloc(bool dir_leases_enabled, enum smb3_tcon_ref_trace trace) ret_buf->debug_id = atomic_inc_return(&tcon_debug_id); ret_buf->tc_count = 1; spin_lock_init(&ret_buf->tc_lock); INIT_LIST_HEAD(&ret_buf->openFileList); INIT_LIST_HEAD(&ret_buf->tcon_list); + INIT_LIST_HEAD(&ret_buf->cifs_sb_list); spin_lock_init(&ret_buf->open_file_lock); spin_lock_init(&ret_buf->stat_lock); + spin_lock_init(&ret_buf->sb_list_lock); atomic_set(&ret_buf->num_local_opens, 0); atomic_set(&ret_buf->num_remote_opens, 0); ret_buf->stats_from_time = ktime_get_real_seconds(); #ifdef CONFIG_CIFS_FSCACHE mutex_init(&ret_buf->fscache_lock); From patchwork Mon Mar 31 13:33:14 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Zhaolong X-Patchwork-Id: 14033619 Received: from szxga04-in.huawei.com (szxga04-in.huawei.com [45.249.212.190]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6249B1DED56; Mon, 31 Mar 2025 13:39:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.163.44]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4ZRBtx5dVcz2TS53; Mon, 31 Mar 2025 21:34:33 +0800 (CST) Received: from kwepemg500010.china.huawei.com (unknown [7.202.181.71]) by mail.maildlp.com (Postfix) with ESMTPS id B7B96140156; Mon, 31 Mar 2025 21:39:19 +0800 (CST) Received: from huawei.com (10.175.104.67) by kwepemg500010.china.huawei.com (7.202.181.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 31 Mar 2025 21:39:18 +0800 From: Wang Zhaolong To: , CC: , , , , , , Subject: [PATCH next 2/3] smb: client: Store original IO parameters and prevent zero IO sizes Date: Mon, 31 Mar 2025 21:33:14 +0800 Message-ID: <20250331133315.117666-3-wangzhaolong1@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250331133315.117666-1-wangzhaolong1@huawei.com> References: <20250331133315.117666-1-wangzhaolong1@huawei.com> Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemg500010.china.huawei.com (7.202.181.71) During mount option processing and negotiation with the server, the original user-specified rsize/wsize values were being modified directly. This makes it impossible to recover these values after a connection reset, leading to potential degraded performance after reconnection. The other problem is that When negotiating read and write sizes, there are cases where the negotiated values might calculate to zero, especially during reconnection when server->max_read or server->max_write might be reset. In general, these values come from the negotiation response. According to MS-SMB2 specification, these values should be at least 65536 bytes. This patch improves IO parameter handling: 1. Adds vol_rsize and vol_wsize fields to store the original user-specified values separately from the negotiated values 2. Uses got_rsize/got_wsize flags to determine if values were user-specified rather than checking for non-zero values, which is more reliable 3. Adds a prevent_zero_iosize() helper function to ensure IO sizes are never negotiated down to zero, which could happen in edge cases like when server->max_read/write is zero The changes make the CIFS client more resilient to unusual server responses and reconnection scenarios, preventing potential failures when IO sizes are calculated to be zero. Signed-off-by: Wang Zhaolong --- fs/smb/client/fs_context.c | 2 ++ fs/smb/client/fs_context.h | 3 +++ fs/smb/client/smb1ops.c | 6 +++--- fs/smb/client/smb2ops.c | 27 +++++++++++++++++++-------- fs/smb/common/smb2pdu.h | 3 +++ 5 files changed, 30 insertions(+), 11 deletions(-) diff --git a/fs/smb/client/fs_context.c b/fs/smb/client/fs_context.c index 8c73d4d60d1a..611299bcf6a4 100644 --- a/fs/smb/client/fs_context.c +++ b/fs/smb/client/fs_context.c @@ -1325,10 +1325,11 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, ctx->rasize = result.uint_32; break; case Opt_rsize: ctx->rsize = result.uint_32; ctx->got_rsize = true; + ctx->vol_rsize = ctx->rsize; break; case Opt_wsize: ctx->wsize = result.uint_32; ctx->got_wsize = true; if (ctx->wsize % PAGE_SIZE != 0) { @@ -1340,10 +1341,11 @@ static int smb3_fs_context_parse_param(struct fs_context *fc, cifs_dbg(VFS, "wsize rounded down to %d to multiple of PAGE_SIZE %ld\n", ctx->wsize, PAGE_SIZE); } } + ctx->vol_wsize = ctx->wsize; break; case Opt_acregmax: if (result.uint_32 > CIFS_MAX_ACTIMEO / HZ) { cifs_errorf(fc, "acregmax too large\n"); goto cifs_parse_mount_err; diff --git a/fs/smb/client/fs_context.h b/fs/smb/client/fs_context.h index 881bfc08667e..7516ccdc69c7 100644 --- a/fs/smb/client/fs_context.h +++ b/fs/smb/client/fs_context.h @@ -277,10 +277,13 @@ struct smb3_fs_context { bool rdma:1; bool multichannel:1; bool use_client_guid:1; /* reuse existing guid for multichannel */ u8 client_guid[SMB2_CLIENT_GUID_SIZE]; + /* User-specified original r/wsize value */ + unsigned int vol_rsize; + unsigned int vol_wsize; unsigned int bsize; unsigned int rasize; unsigned int rsize; unsigned int wsize; unsigned int min_offload; diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c index d6e2fb669c40..398f1f4d5edb 100644 --- a/fs/smb/client/smb1ops.c +++ b/fs/smb/client/smb1ops.c @@ -442,12 +442,12 @@ cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); struct TCP_Server_Info *server = tcon->ses->server; unsigned int wsize; /* start with specified wsize, or default */ - if (ctx->wsize) - wsize = ctx->wsize; + if (ctx->got_wsize) + wsize = ctx->vol_wsize; else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) wsize = CIFS_DEFAULT_IOSIZE; else wsize = CIFS_DEFAULT_NON_POSIX_WSIZE; @@ -495,11 +495,11 @@ cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) else if (server->capabilities & CAP_LARGE_READ_X) defsize = CIFS_DEFAULT_NON_POSIX_RSIZE; else defsize = server->maxBuf - sizeof(READ_RSP); - rsize = ctx->rsize ? ctx->rsize : defsize; + rsize = ctx->got_rsize ? ctx->vol_rsize : defsize; /* * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to * the client's MaxBufferSize. */ diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 4dd11eafb69d..4cd1a1f896bb 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -468,33 +468,44 @@ smb2_negotiate(const unsigned int xid, if (rc == -EAGAIN) rc = -EHOSTDOWN; return rc; } +static inline unsigned int +prevent_zero_iosize(unsigned int size, const char *type) +{ + if (size == 0) { + cifs_dbg(VFS, "SMB: Zero %ssize calculated, using minimum value %u\n", + type, CIFS_MIN_DEFAULT_IOSIZE); + return CIFS_MIN_DEFAULT_IOSIZE; + } + return size; +} + static unsigned int smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) { struct TCP_Server_Info *server = tcon->ses->server; unsigned int wsize; /* start with specified wsize, or default */ - wsize = ctx->wsize ? ctx->wsize : CIFS_DEFAULT_IOSIZE; + wsize = ctx->got_wsize ? ctx->vol_wsize : CIFS_DEFAULT_IOSIZE; wsize = min_t(unsigned int, wsize, server->max_write); if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE); - return wsize; + return prevent_zero_iosize(wsize, "w"); } static unsigned int smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) { struct TCP_Server_Info *server = tcon->ses->server; unsigned int wsize; /* start with specified wsize, or default */ - wsize = ctx->wsize ? ctx->wsize : SMB3_DEFAULT_IOSIZE; + wsize = ctx->got_wsize ? ctx->vol_wsize : SMB3_DEFAULT_IOSIZE; wsize = min_t(unsigned int, wsize, server->max_write); #ifdef CONFIG_CIFS_SMB_DIRECT if (server->rdma) { if (server->sign) /* @@ -512,37 +523,37 @@ smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) } #endif if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE); - return wsize; + return prevent_zero_iosize(wsize, "w"); } static unsigned int smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) { struct TCP_Server_Info *server = tcon->ses->server; unsigned int rsize; /* start with specified rsize, or default */ - rsize = ctx->rsize ? ctx->rsize : CIFS_DEFAULT_IOSIZE; + rsize = ctx->got_rsize ? ctx->vol_rsize : CIFS_DEFAULT_IOSIZE; rsize = min_t(unsigned int, rsize, server->max_read); if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE); - return rsize; + return prevent_zero_iosize(rsize, "r"); } static unsigned int smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) { struct TCP_Server_Info *server = tcon->ses->server; unsigned int rsize; /* start with specified rsize, or default */ - rsize = ctx->rsize ? ctx->rsize : SMB3_DEFAULT_IOSIZE; + rsize = ctx->got_rsize ? ctx->vol_rsize : SMB3_DEFAULT_IOSIZE; rsize = min_t(unsigned int, rsize, server->max_read); #ifdef CONFIG_CIFS_SMB_DIRECT if (server->rdma) { if (server->sign) /* @@ -561,11 +572,11 @@ smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) #endif if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU)) rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE); - return rsize; + return prevent_zero_iosize(rsize, "r"); } /* * compare two interfaces a and b * return 0 if everything matches. diff --git a/fs/smb/common/smb2pdu.h b/fs/smb/common/smb2pdu.h index c7a0efda4403..764dca80c15c 100644 --- a/fs/smb/common/smb2pdu.h +++ b/fs/smb/common/smb2pdu.h @@ -93,10 +93,13 @@ * pages in a single call. With PAGE_SIZE == 4k, this means we can * fill a single wsize request with a single call. */ #define SMB3_DEFAULT_IOSIZE (4 * 1024 * 1024) +/* According to MS-SMB2 specification The minimum recommended value is 65536.*/ +#define CIFS_MIN_DEFAULT_IOSIZE (65536) + /* * SMB2 Header Definition * * "MBZ" : Must be Zero * "BB" : BugBug, Something to check/review/analyze later From patchwork Mon Mar 31 13:33:15 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Zhaolong X-Patchwork-Id: 14033620 Received: from szxga07-in.huawei.com (szxga07-in.huawei.com [45.249.212.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 31CCF1E5B67; Mon, 31 Mar 2025 13:39:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.35 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743428365; cv=none; b=Il3kSZeBF4cl6084gJZpdduxFnW2DbnR3WrzaZPQ6qrqfDCS5FSxMTo04v7aAP6FVbJemki1sZF3V4MMzRpYFiB/nGs1Ua0N/wB5qtEHSdGy8BYBTUDP3JZiyQpGttPMwUWGtOH1/25sjjLFHoEITnm8m1hbxWPhwfDnEsPOWU8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1743428365; c=relaxed/simple; bh=hwE5GiKE3zL2s2GG0JF3k9o7qrrnfq/qiZzBJzBHOHI=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=qfgQ8mbq6/uG1JlkbK+I598T1CcvGFIH9almnDsqlKIBKSVVYf6w/tVyKYYL/48EoKBZNuUuNIay58Qz8nejdmX756ilHGqc85afcut8VPJd1Ylh8NzT0/nk82Y8MwEP/S6woo/rVUBAND4JQXQiqsEZ9oK+ClvhOwDMa8vh7/8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.35 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.214]) by szxga07-in.huawei.com (SkyGuard) with ESMTP id 4ZRBty074tz1f1gQ; Mon, 31 Mar 2025 21:34:34 +0800 (CST) Received: from kwepemg500010.china.huawei.com (unknown [7.202.181.71]) by mail.maildlp.com (Postfix) with ESMTPS id 894441A016C; Mon, 31 Mar 2025 21:39:20 +0800 (CST) Received: from huawei.com (10.175.104.67) by kwepemg500010.china.huawei.com (7.202.181.71) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Mon, 31 Mar 2025 21:39:19 +0800 From: Wang Zhaolong To: , CC: , , , , , , Subject: [PATCH next 3/3] smb: client: Update IO sizes after reconnection Date: Mon, 31 Mar 2025 21:33:15 +0800 Message-ID: <20250331133315.117666-4-wangzhaolong1@huawei.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20250331133315.117666-1-wangzhaolong1@huawei.com> References: <20250331133315.117666-1-wangzhaolong1@huawei.com> Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To kwepemg500010.china.huawei.com (7.202.181.71) When a SMB connection is reset and reconnected, the negotiated IO parameters (rsize/wsize) can become out of sync with the server's current capabilities. This can lead to suboptimal performance or even IO failures if the server's limits have changed. This patch implements automatic IO size renegotiation: 1. Adds cifs_renegotiate_iosize() function to update all superblocks associated with a tree connection 2. Updates each mount's rsize/wsize based on current server capabilities 3. Calls this function after successful tree connection reconnection With this change, all mount points will automatically maintain optimal and reliable IO parameters after network disruptions, using the bidirectional mapping added in previous patches. This completes the series improving connection resilience by keeping mount parameters synchronized with server capabilities. Signed-off-by: Wang Zhaolong --- fs/smb/client/smb2pdu.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-) diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index f9c521b3c65e..103319cdce00 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -41,10 +41,11 @@ #ifdef CONFIG_CIFS_DFS_UPCALL #include "dfs_cache.h" #endif #include "cached_dir.h" #include "compress.h" +#include "fs_context.h" /* * The following table defines the expected "StructureSize" of SMB2 requests * in order by SMB2 command. This is similar to "wct" in SMB/CIFS requests. * @@ -4089,10 +4090,28 @@ smb2_echo_callback(struct mid_q_entry *mid) release_mid(mid); add_credits(server, &credits, CIFS_ECHO_OP); } +static void cifs_renegotiate_iosize(struct TCP_Server_Info *server, + struct cifs_tcon *tcon) +{ + struct cifs_sb_info *cifs_sb; + + if (server == NULL || tcon == NULL) + return; + + spin_lock(&tcon->sb_list_lock); + list_for_each_entry(cifs_sb, &tcon->cifs_sb_list, tcon_sb_link) { + cifs_sb->ctx->rsize = + server->ops->negotiate_rsize(tcon, cifs_sb->ctx); + cifs_sb->ctx->wsize = + server->ops->negotiate_wsize(tcon, cifs_sb->ctx); + } + spin_unlock(&tcon->sb_list_lock); +} + void smb2_reconnect_server(struct work_struct *work) { struct TCP_Server_Info *server = container_of(work, struct TCP_Server_Info, reconnect.work); struct TCP_Server_Info *pserver; @@ -4174,13 +4193,14 @@ void smb2_reconnect_server(struct work_struct *work) } spin_unlock(&cifs_tcp_ses_lock); list_for_each_entry_safe(tcon, tcon2, &tmp_list, rlist) { rc = smb2_reconnect(SMB2_INTERNAL_CMD, tcon, server, true); - if (!rc) + if (!rc) { + cifs_renegotiate_iosize(server, tcon); cifs_reopen_persistent_handles(tcon); - else + } else resched = true; list_del_init(&tcon->rlist); if (tcon->ipc) cifs_put_smb_ses(tcon->ses); else