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When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child. Suggested-by: Jan Kara Signed-off-by: Amir Goldstein Signed-off-by: Stephen Brennan --- Notes: This is Amir's patch based on Jan's idea, with no changes or alterations from my side. fs/notify/fsnotify.c | 26 ++++++++++++++++++++------ fs/notify/fsnotify.h | 3 ++- fs/notify/mark.c | 32 +++++++++++++++++++++++++++++--- include/linux/fsnotify_backend.h | 8 +++++--- 4 files changed, 56 insertions(+), 13 deletions(-) diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 7974e91ffe13..2c50e9e50d35 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -103,17 +103,13 @@ void fsnotify_sb_delete(struct super_block *sb) * parent cares. Thus when an event happens on a child it can quickly tell * if there is a need to find a parent and send the event to the parent. */ -void __fsnotify_update_child_dentry_flags(struct inode *inode) +void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) { struct dentry *alias; - int watched; if (!S_ISDIR(inode->i_mode)) return; - /* determine if the children should tell inode about their events */ - watched = fsnotify_inode_watches_children(inode); - spin_lock(&inode->i_lock); /* run all of the dentries associated with this inode. Since this is a * directory, there damn well better only be one item on this list */ @@ -140,6 +136,24 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode) spin_unlock(&inode->i_lock); } +/* + * Lazily clear false positive PARENT_WATCHED flag for child whose parent had + * stopped wacthing children. + */ +static void fsnotify_update_child_dentry_flags(struct inode *inode, + struct dentry *dentry) +{ + spin_lock(&dentry->d_lock); + /* + * d_lock is a sufficient barrier to prevent observing a non-watched + * parent state from before the fsnotify_update_children_dentry_flags() + * or fsnotify_update_flags() call that had set PARENT_WATCHED. + */ + if (!fsnotify_inode_watches_children(inode)) + dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; + spin_unlock(&dentry->d_lock); +} + /* Are inode/sb/mount interested in parent and name info with this event? */ static bool fsnotify_event_needs_parent(struct inode *inode, struct mount *mnt, __u32 mask) @@ -208,7 +222,7 @@ int __fsnotify_parent(struct dentry *dentry, __u32 mask, const void *data, p_inode = parent->d_inode; p_mask = fsnotify_inode_watches_children(p_inode); if (unlikely(parent_watched && !p_mask)) - __fsnotify_update_child_dentry_flags(p_inode); + fsnotify_update_child_dentry_flags(p_inode, dentry); /* * Include parent/name in notification either if some notification diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h index fde74eb333cc..bce9be36d06b 100644 --- a/fs/notify/fsnotify.h +++ b/fs/notify/fsnotify.h @@ -74,7 +74,8 @@ static inline void fsnotify_clear_marks_by_sb(struct super_block *sb) * update the dentry->d_flags of all of inode's children to indicate if inode cares * about events that happen to its children. */ -extern void __fsnotify_update_child_dentry_flags(struct inode *inode); +extern void fsnotify_update_children_dentry_flags(struct inode *inode, + bool watched); extern struct kmem_cache *fsnotify_mark_connector_cachep; diff --git a/fs/notify/mark.c b/fs/notify/mark.c index c74ef947447d..6797a2952f87 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -176,6 +176,24 @@ static void *__fsnotify_recalc_mask(struct fsnotify_mark_connector *conn) return fsnotify_update_iref(conn, want_iref); } +static bool fsnotify_conn_watches_children( + struct fsnotify_mark_connector *conn) +{ + if (conn->type != FSNOTIFY_OBJ_TYPE_INODE) + return false; + + return fsnotify_inode_watches_children(fsnotify_conn_inode(conn)); +} + +static void fsnotify_conn_set_children_dentry_flags( + struct fsnotify_mark_connector *conn) +{ + if (conn->type != FSNOTIFY_OBJ_TYPE_INODE) + return; + + fsnotify_update_children_dentry_flags(fsnotify_conn_inode(conn), true); +} + /* * Calculate mask of events for a list of marks. The caller must make sure * connector and connector->obj cannot disappear under us. Callers achieve @@ -184,15 +202,23 @@ static void *__fsnotify_recalc_mask(struct fsnotify_mark_connector *conn) */ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn) { + bool update_children; + if (!conn) return; spin_lock(&conn->lock); + update_children = !fsnotify_conn_watches_children(conn); __fsnotify_recalc_mask(conn); + update_children &= fsnotify_conn_watches_children(conn); spin_unlock(&conn->lock); - if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) - __fsnotify_update_child_dentry_flags( - fsnotify_conn_inode(conn)); + /* + * Set children's PARENT_WATCHED flags only if parent started watching. + * When parent stops watching, we clear false positive PARENT_WATCHED + * flags lazily in __fsnotify_parent(). + */ + if (update_children) + fsnotify_conn_set_children_dentry_flags(conn); } /* Free all connectors queued for freeing once SRCU period ends */ diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index d7d96c806bff..1276de409724 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -563,12 +563,14 @@ static inline __u32 fsnotify_parent_needed_mask(__u32 mask) static inline int fsnotify_inode_watches_children(struct inode *inode) { + __u32 parent_mask = READ_ONCE(inode->i_fsnotify_mask); + /* FS_EVENT_ON_CHILD is set if the inode may care */ - if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD)) + if (!(parent_mask & FS_EVENT_ON_CHILD)) return 0; /* this inode might care about child events, does it care about the * specific set of events that can happen on a child? */ - return inode->i_fsnotify_mask & FS_EVENTS_POSS_ON_CHILD; + return parent_mask & FS_EVENTS_POSS_ON_CHILD; } /* @@ -582,7 +584,7 @@ static inline void fsnotify_update_flags(struct dentry *dentry) /* * Serialisation of setting PARENT_WATCHED on the dentries is provided * by d_lock. If inotify_inode_watched changes after we have taken - * d_lock, the following __fsnotify_update_child_dentry_flags call will + * d_lock, the following fsnotify_update_children_dentry_flags call will * find our entry, so it will spin until we complete here, and update * us with the new state. */ From patchwork Fri Nov 11 22:06:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Brennan X-Patchwork-Id: 19022 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp990949wru; Fri, 11 Nov 2022 14:12:19 -0800 (PST) X-Google-Smtp-Source: AA0mqf45HHQ0y6oXpmXw4eiYqmqMaWIPviQnHxIS3MKMIAqSVV1QX/E4jkPqdmC9dCIZsnmuNcEC X-Received: by 2002:a63:2444:0:b0:46e:d2da:8ea6 with SMTP id k65-20020a632444000000b0046ed2da8ea6mr3314263pgk.208.1668204739063; Fri, 11 Nov 2022 14:12:19 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1668204739; cv=pass; d=google.com; s=arc-20160816; b=dG3pI/zNeyOHCq3DwGVFx0ihkrLhSYgeu8CUbGdt6tLWuGWSopuutC/PxR0vuhd8EN d4xOKPOaQ+oN8z7Wrv3U42DSMn78e7Bmr9qqVLHj2jqJp2ajgiz39sP+BUFwPEmUW9ag +Ikh1NLnu+jxzj9DbrFSveE9qbUooHvl+344pq9deBjQzMhKuaz51n82l4U3q6njYzTm HosrbBIlOQnppFDpq6lZgSwtreFZ6iPwaN9UNE3mNO58VwvvBv+3wmbaBjEKjvjdPsrA OAFI3sxHxJadTof1PATV9vmDuev4403FI3uQYx/BbvfgPbxfNpfPkTNdziRvfVOe0qY8 CKgQ== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:dkim-signature; bh=FtqVkv0iOH1SN8NSSVD9V+dDgHKSvOJG9Pe24Pax1O4=; b=NbQHWFqzO1skJu+xOtg0mth4j04j+5SVlFxiGk1VrQBK4gag5avgLDMyRl9l+OprQ+ nQFNVlWIr2AlzUa1O5N+UC8/1sq9IIrViuSPn/ve/zl7Cbwy0GzYCTamqFiHiZZYzwV1 QFLvAe9zomra8zlKNoaw8xfqWjye3WGQnpWCUbRGgo4ve7EoI/1l8Idt2vYS9SutO/eY 57vgZ0nHwZRelENH6wf46E7aw0oA6mP5O4Ra/y2ZCNPpj8AmRAkJQvY/kQNMoRTdQ21G Q0T/b7M6d8U1vaQvTvciSbL4fBw0EjoMJA+vpAHnnTojOBaokmxUWncGdSCfeAW3ROb2 UHog== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2022-7-12 header.b=qu5Khkgy; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=Btm6Rm7k; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from out1.vger.email (out1.vger.email. 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Use d_find_any_alias() and no longer hold i_lock. Signed-off-by: Stephen Brennan Reviewed-by: Amir Goldstein --- Notes: Changes in v4: - Bail out if d_find_any_alias() returns NULL - Rebase on Amir's patch Changes in v3: - Add newlines in block comment - d_find_any_alias() returns a reference, which I was leaking. Add a dput(alias) at the end. - Add Amir's R-b fs/notify/fsnotify.c | 46 ++++++++++++++++++++++---------------------- 1 file changed, 23 insertions(+), 23 deletions(-) diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 2c50e9e50d35..409d479cbbc6 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -105,35 +105,35 @@ void fsnotify_sb_delete(struct super_block *sb) */ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) { - struct dentry *alias; + struct dentry *alias, *child; if (!S_ISDIR(inode->i_mode)) return; - spin_lock(&inode->i_lock); - /* run all of the dentries associated with this inode. Since this is a - * directory, there damn well better only be one item on this list */ - hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { - struct dentry *child; - - /* run all of the children of the original inode and fix their - * d_flags to indicate parental interest (their parent is the - * original inode) */ - spin_lock(&alias->d_lock); - list_for_each_entry(child, &alias->d_subdirs, d_child) { - if (!child->d_inode) - continue; + /* Since this is a directory, there damn well better only be one child */ + alias = d_find_any_alias(inode); + if (!alias) + return; - spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); - if (watched) - child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; - else - child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; - spin_unlock(&child->d_lock); - } - spin_unlock(&alias->d_lock); + /* + * run all of the children of the original inode and fix their + * d_flags to indicate parental interest (their parent is the + * original inode) + */ + spin_lock(&alias->d_lock); + list_for_each_entry(child, &alias->d_subdirs, d_child) { + if (!child->d_inode) + continue; + + spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); + if (watched) + child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; + else + child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; + spin_unlock(&child->d_lock); } - spin_unlock(&inode->i_lock); + spin_unlock(&alias->d_lock); + dput(alias); } /* From patchwork Fri Nov 11 22:06:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Brennan X-Patchwork-Id: 19021 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp990720wru; Fri, 11 Nov 2022 14:11:45 -0800 (PST) X-Google-Smtp-Source: AA0mqf78F1IhgdiHDarline8GSo554yg/NDkbYI+eHq0OPtkIXTm3r2YQGQrHNRaGDGyV+zFL04g X-Received: by 2002:a63:a5b:0:b0:46e:f67c:c097 with SMTP id z27-20020a630a5b000000b0046ef67cc097mr3273397pgk.623.1668204704747; Fri, 11 Nov 2022 14:11:44 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1668204704; cv=pass; d=google.com; s=arc-20160816; b=jAwBzOA6BGp2twXo91DhAVZ+JJMlH7/lBLh4F7SfvL/x9OFb5uDByXtUUIZR1mhaI3 ElmXi2bLNWHbybw0jo/EL3Ho2IJq0mtsMQgVwcRURTHfDSkewDBPH5sGLqJvJRHzKzl4 td8lyxUlMrzOiNcU2rXlk7r2FWEeaLs3bIQn8sxgc0y1r+YbMtSZX1a/GP+IKkkDEGo9 dmZkAsbpJo6dqQ1QK90t78N8jSLBzb3zYhx5UQj57kLfp8Vkwn3Yg4r8uvtYmE8GfMc9 pyigHINfvwhORlqcrP9NvBc4pkX7slqHZsPkeiBLt+Xuu5DSbIePCUlA5NTKzU5Dqbk2 YOyg== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:dkim-signature; bh=r+JK2xhlQ14b6zZzmCECL5gWzBVH/1UEmZ33S4f1XoI=; b=nPmjgSbmGeXKYc94u8ztlxjbP/1rKK7cyTL1/XknvdRvg+jEWkhx2sgOExja9yHME1 nLJi2hXT9MDo1fyGGlCsHo3NxA06o8H3fZFczuosK1nE/q3W01GTi7WaRxf2jeEFA30z xH7f2K+jopoSKwcTXH19GtEd0JwmyMJlpIPBtBuvFfnxKvF/F0QcCEZbuIEToVxgreR0 snptLrWnxkgBO5oDO/+NfRGmXRP/r0P17XUAVkKH2j+bXSr/TnOhFwZpTJdTrrpsoFKr UXU4UhHIJS44jq3a2/souylRtOZifLMmJr9te9ek3+Mmbo9PncIxsO+9SJs8T59Q4DvH TSjA== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2022-7-12 header.b=tclGVTzx; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=CeFVh9we; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from out1.vger.email (out1.vger.email. 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Signed-off-by: Stephen Brennan Reviewed-by: Amir Goldstein --- fs/notify/dnotify/dnotify.c | 28 +++++++++++++++++++--------- 1 file changed, 19 insertions(+), 9 deletions(-) diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c index 190aa717fa32..a9f05b3cf5ea 100644 --- a/fs/notify/dnotify/dnotify.c +++ b/fs/notify/dnotify/dnotify.c @@ -58,10 +58,10 @@ struct dnotify_mark { * dnotify cares about for that inode may change. This function runs the * list of everything receiving dnotify events about this directory and calculates * the set of all those events. After it updates what dnotify is interested in - * it calls the fsnotify function so it can update the set of all events relevant - * to this inode. + * it returns true if fsnotify_recalc_mask() should be called to update the set + * of all events related to this inode. */ -static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark) +static bool dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark) { __u32 new_mask = 0; struct dnotify_struct *dn; @@ -74,10 +74,9 @@ static void dnotify_recalc_inode_mask(struct fsnotify_mark *fsn_mark) for (dn = dn_mark->dn; dn != NULL; dn = dn->dn_next) new_mask |= (dn->dn_mask & ~FS_DN_MULTISHOT); if (fsn_mark->mask == new_mask) - return; + return false; fsn_mark->mask = new_mask; - - fsnotify_recalc_mask(fsn_mark->connector); + return true; } /* @@ -97,6 +96,7 @@ static int dnotify_handle_event(struct fsnotify_mark *inode_mark, u32 mask, struct dnotify_struct **prev; struct fown_struct *fown; __u32 test_mask = mask & ~FS_EVENT_ON_CHILD; + bool recalc = false; /* not a dir, dnotify doesn't care */ if (!dir && !(mask & FS_ISDIR)) @@ -118,12 +118,15 @@ static int dnotify_handle_event(struct fsnotify_mark *inode_mark, u32 mask, else { *prev = dn->dn_next; kmem_cache_free(dnotify_struct_cache, dn); - dnotify_recalc_inode_mask(inode_mark); + recalc = dnotify_recalc_inode_mask(inode_mark); } } spin_unlock(&inode_mark->lock); + if (recalc) + fsnotify_recalc_mask(inode_mark->connector); + return 0; } @@ -158,6 +161,7 @@ void dnotify_flush(struct file *filp, fl_owner_t id) struct dnotify_struct **prev; struct inode *inode; bool free = false; + bool recalc = false; inode = file_inode(filp); if (!S_ISDIR(inode->i_mode)) @@ -176,7 +180,7 @@ void dnotify_flush(struct file *filp, fl_owner_t id) if ((dn->dn_owner == id) && (dn->dn_filp == filp)) { *prev = dn->dn_next; kmem_cache_free(dnotify_struct_cache, dn); - dnotify_recalc_inode_mask(fsn_mark); + recalc = dnotify_recalc_inode_mask(fsn_mark); break; } prev = &dn->dn_next; @@ -184,6 +188,9 @@ void dnotify_flush(struct file *filp, fl_owner_t id) spin_unlock(&fsn_mark->lock); + if (recalc) + fsnotify_recalc_mask(fsn_mark->connector); + /* nothing else could have found us thanks to the dnotify_groups mark_mutex */ if (dn_mark->dn == NULL) { @@ -268,6 +275,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) struct file *f; int destroy = 0, error = 0; __u32 mask; + bool recalc = false; /* we use these to tell if we need to kfree */ new_fsn_mark = NULL; @@ -377,9 +385,11 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) else if (error == -EEXIST) error = 0; - dnotify_recalc_inode_mask(fsn_mark); + recalc = dnotify_recalc_inode_mask(fsn_mark); out: spin_unlock(&fsn_mark->lock); + if (recalc) + fsnotify_recalc_mask(fsn_mark->connector); if (destroy) fsnotify_detach_mark(fsn_mark); From patchwork Fri Nov 11 22:06:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Brennan X-Patchwork-Id: 19025 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp993452wru; 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Since iteration needs to hold alias->d_lock, this can trigger soft lockups. It would be best to make this iteration sleepable. We can drop alias->d_lock and sleep, by taking a reference to the current child. However, we need to be careful, since it's possible for the child's list pointers to be modified once we drop alias->d_lock. The following are the only cases where the list pointers are modified: 1. dentry_unlist() in fs/dcache.c This is a helper of dentry_kill(). This function is quite careful to check the reference count of the dentry once it has taken the requisite locks, and bail out if a new reference was taken. So we can be safe that, assuming we found the dentry and took a reference before dropping alias->d_lock, any concurrent dentry_kill() should bail out and leave our list pointers untouched. 2. __d_move() in fs/dcache.c If the child was moved to a new parent, then we can detect this by testing d_parent and retrying the iteration. 3. Initialization code in d_alloc() family We are safe from this code, since we cannot encounter a dentry until it has been initialized. 4. Cursor code in fs/libfs.c for dcache_readdir() Dentries with DCACHE_DENTRY_CURSOR should be skipped before sleeping, since we could awaken to find they have skipped over a portion of the child list. Given these considerations, we can carefully write a loop that iterates over d_subdirs and is capable of going to sleep periodically. Signed-off-by: Stephen Brennan --- Notes: v4: - I've updated this patch so it should be safe even without the inode locked, by handling cursors and d_move() races. - Moved comments to lower indentation - I didn't keep Amir's R-b since this was a fair bit of change. v3: - removed if statements around dput() v2: - added a check for child->d_parent != alias and retry logic fs/notify/fsnotify.c | 46 ++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 42 insertions(+), 4 deletions(-) diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 409d479cbbc6..0ba61211456c 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -105,7 +105,7 @@ void fsnotify_sb_delete(struct super_block *sb) */ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) { - struct dentry *alias, *child; + struct dentry *alias, *child, *last_ref = NULL; if (!S_ISDIR(inode->i_mode)) return; @@ -116,12 +116,49 @@ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) return; /* - * run all of the children of the original inode and fix their - * d_flags to indicate parental interest (their parent is the - * original inode) + * These lists can get very long, so we may need to sleep during + * iteration. Normally this would be impossible without a cursor, + * but since we have the inode locked exclusive, we're guaranteed + * that the directory won't be modified, so whichever dentry we + * pick to sleep on won't get moved. So, start a manual iteration + * over d_subdirs which will allow us to sleep. */ spin_lock(&alias->d_lock); +retry: list_for_each_entry(child, &alias->d_subdirs, d_child) { + /* + * We need to hold a reference while we sleep. But we cannot + * sleep holding a reference to a cursor, or we risk skipping + * through the list. + * + * When we wake, dput() could free the dentry, invalidating the + * list pointers. We can't look at the list pointers until we + * re-lock the parent, and we can't dput() once we have the + * parent locked. So the solution is to hold onto our reference + * and free it the *next* time we drop alias->d_lock: either at + * the end of the function, or at the time of the next sleep. + */ + if (child->d_flags & DCACHE_DENTRY_CURSOR) + continue; + if (need_resched()) { + dget(child); + spin_unlock(&alias->d_lock); + dput(last_ref); + last_ref = child; + cond_resched(); + spin_lock(&alias->d_lock); + /* Check for races with __d_move() */ + if (child->d_parent != alias) + goto retry; + } + + /* + * This check is after the cond_resched() for a reason: it is + * safe to sleep holding a negative dentry reference. If the + * directory contained many negative dentries, and we skipped + * them checking need_resched(), we may never end up sleeping + * where necessary, and could trigger a soft lockup. + */ if (!child->d_inode) continue; @@ -133,6 +170,7 @@ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) spin_unlock(&child->d_lock); } spin_unlock(&alias->d_lock); + dput(last_ref); dput(alias); } From patchwork Fri Nov 11 22:06:14 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephen Brennan X-Patchwork-Id: 19024 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:6687:0:0:0:0:0 with SMTP id l7csp993324wru; Fri, 11 Nov 2022 14:18:54 -0800 (PST) X-Google-Smtp-Source: AA0mqf5gFhiw7BC4ttjHZ0NsozpU3GFLeJPCUusWHK/EyzJzMCpb259+l/afD8US0AzRApGtE3Ps X-Received: by 2002:a63:4e16:0:b0:43c:4724:1719 with SMTP id c22-20020a634e16000000b0043c47241719mr3447308pgb.251.1668205134574; Fri, 11 Nov 2022 14:18:54 -0800 (PST) ARC-Seal: i=2; a=rsa-sha256; t=1668205134; cv=pass; d=google.com; s=arc-20160816; b=tOpL3Wk5EZeN0MRfotqqL8Hma/AE3rJAr2ZSMkX1eelS3LbQZNZL2KCnVWrw8Jk5nX 80JjEifgehcwhylUqMOjzpBMDzJbJIIEaqjEc73dhGSap6P86NRj2I5zBDWcMgqBoFpX kehjwa57fLsQg7/mcgz/49jyt3hjn32X9S9kNSPUIYjFUiJlkZIL2AVNzx5Ipz/9A7VQ bUT2i6MXJkCHPOJaC5eGLt8StFA7JClnItEpbta6QHdrg27RNBdGYeHm7kb9qHGRbL9E DFabXFKNHcVhrZXcDz5bVcI+yvUz4cHVGuuZRnPhBhWLIstUvoznVAxKKf58a/kNVu8Z fM7g== ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:mime-version:content-transfer-encoding :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:dkim-signature; bh=grHxMB6fo3nJ+yilwLG4loljxrOwvfJeEPETyErjoHM=; b=M4Tb8Hr3Xy0ZfiA1P1bAF8m/I5hlM80Px+PZGNi0OLzdzJheJWaXdtLlGrV35DGDGA a9qsGbQIPxvvXEEScrHE2eCZU7TtTtGXKsCW6uwdWmd/D9Ku5VNll4ztvIAlKovuhtxn pb45O1dThWr6IgvCjP8OK1hSNHAjn0xC+3yYc4iIHDKeY5M+v7Ebw+q7x3f1LdJrNjCW BNJQG5BwtkS/qOU69ilY+TTEDwgU2hk1dqZ2X6gNVwZbttdy+oKA1+UIjUpfMi0dS+jq NAAl1ZfriEGbM7WViLr3iq+pKQ5nMUe+0O1I8xl30IIxc8bOr3DX6cKmseU6clArLqrz Azhg== ARC-Authentication-Results: i=2; mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2022-7-12 header.b=TFOMD5BR; dkim=pass header.i=@oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=KwofHK8K; arc=pass (i=1 spf=pass spfdomain=oracle.com dkim=pass dkdomain=oracle.com dmarc=pass fromdomain=oracle.com); spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: from out1.vger.email (out1.vger.email. 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Imagine that two CPUs attempt to add a mark to an inode which would require watching the children of that directory: CPU 1: CPU 2: fsnotify_recalc_mask() { spin_lock(); update_children = ... __fsnotify_recalc_mask(); update_children = ... spin_unlock(); // update_children is true! fsnotify_conn_set_children_dentry_flags() { // updating flags ... cond_resched(); fsnotify_recalc_mask() { spin_lock(); update_children = ... __fsnotify_recalc_mask(); update_children = ... spin_unlock(); // update_children is false } // returns to userspace, but // not all children are marked // continue updating flags } } To prevent this situation, hold the directory inode lock. This ensures that any concurrent update to the mask will block until the update is complete, so that we can guarantee that child flags are set prior to returning. Since the directory inode lock is now held during iteration over d_subdirs, we are guaranteed that __d_move() cannot remove the dentry we hold, so we no longer need check whether we should retry iteration. We also are guaranteed that no cursors are moving through the list, since simple_readdir() holds the inode read lock. Simplify the iteration by removing this logic. Signed-off-by: Stephen Brennan --- fs/notify/fsnotify.c | 25 +++++++++---------------- fs/notify/mark.c | 8 ++++++++ 2 files changed, 17 insertions(+), 16 deletions(-) diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 0ba61211456c..b5778775b88d 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -102,6 +102,8 @@ void fsnotify_sb_delete(struct super_block *sb) * on a child we run all of our children and set a dentry flag saying that the * parent cares. Thus when an event happens on a child it can quickly tell * if there is a need to find a parent and send the event to the parent. + * + * Context: inode locked exclusive */ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) { @@ -124,22 +126,16 @@ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) * over d_subdirs which will allow us to sleep. */ spin_lock(&alias->d_lock); -retry: list_for_each_entry(child, &alias->d_subdirs, d_child) { /* - * We need to hold a reference while we sleep. But we cannot - * sleep holding a reference to a cursor, or we risk skipping - * through the list. - * - * When we wake, dput() could free the dentry, invalidating the - * list pointers. We can't look at the list pointers until we - * re-lock the parent, and we can't dput() once we have the - * parent locked. So the solution is to hold onto our reference - * and free it the *next* time we drop alias->d_lock: either at - * the end of the function, or at the time of the next sleep. + * We need to hold a reference while we sleep. When we wake, + * dput() could free the dentry, invalidating the list pointers. + * We can't look at the list pointers until we re-lock the + * parent, and we can't dput() once we have the parent locked. + * So the solution is to hold onto our reference and free it the + * *next* time we drop alias->d_lock: either at the end of the + * function, or at the time of the next sleep. */ - if (child->d_flags & DCACHE_DENTRY_CURSOR) - continue; if (need_resched()) { dget(child); spin_unlock(&alias->d_lock); @@ -147,9 +143,6 @@ void fsnotify_update_children_dentry_flags(struct inode *inode, bool watched) last_ref = child; cond_resched(); spin_lock(&alias->d_lock); - /* Check for races with __d_move() */ - if (child->d_parent != alias) - goto retry; } /* diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 6797a2952f87..f39cd88ad778 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -203,10 +203,15 @@ static void fsnotify_conn_set_children_dentry_flags( void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn) { bool update_children; + struct inode *inode = NULL; if (!conn) return; + if (conn->type == FSNOTIFY_OBJ_TYPE_INODE) { + inode = fsnotify_conn_inode(conn); + inode_lock(inode); + } spin_lock(&conn->lock); update_children = !fsnotify_conn_watches_children(conn); __fsnotify_recalc_mask(conn); @@ -219,6 +224,9 @@ void fsnotify_recalc_mask(struct fsnotify_mark_connector *conn) */ if (update_children) fsnotify_conn_set_children_dentry_flags(conn); + + if (inode) + inode_unlock(inode); } /* Free all connectors queued for freeing once SRCU period ends */