Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757449Ab0BLVKg (ORCPT ); Fri, 12 Feb 2010 16:10:36 -0500 Received: from fg-out-1718.google.com ([72.14.220.154]:7787 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755644Ab0BLVKe (ORCPT ); Fri, 12 Feb 2010 16:10:34 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=date:from:to:cc:subject:message-id:x-mailer:mime-version :content-type:content-transfer-encoding; b=NNBibIZbxhjtZF+YIJ3lBhKRixZ/K3F8AN4hs+2WrS0CtAHo+9R70J6/JLAuHGxrFQ 7cNLlaGlM+roaevhbHpoy6wPD0hnQVMwT3yEHrGW+GSatgIJeOn55CqS95BKpczGo/zF oymACffv64600NyFr8LqsvsIwruFOlLf0gtc8= Date: Fri, 12 Feb 2010 22:10:22 +0100 From: Joris Dolderer To: linux-kernel@vger.kernel.org Cc: eparis@redhat.com Subject: [PATCH 1/3] fsnotify: tree-watching support Message-ID: <20100212221022.1b9b8544@icecube> X-Mailer: Claws Mail 3.7.5 (GTK+ 2.18.6; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 24968 Lines: 765 Add tree-watching support to fsnotify. Signed-off-by: Joris Dolderer --- diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 274ac86..cc70ecd 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -472,6 +472,7 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, int error; struct dentry *dentry = NULL, *trap; const char *old_name; + int old_len; trap = lock_rename(new_dir, old_dir); /* Source or destination directories don't exist? */ @@ -487,6 +488,7 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, goto exit; old_name = fsnotify_oldname_init(old_dentry->d_name.name); + old_len = old_dentry->d_name.len; error = simple_rename(old_dir->d_inode, old_dentry, new_dir->d_inode, dentry); @@ -495,9 +497,9 @@ struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry, goto exit; } d_move(old_dentry, dentry); - fsnotify_move(old_dir->d_inode, new_dir->d_inode, old_name, - old_dentry->d_name.name, S_ISDIR(old_dentry->d_inode->i_mode), - NULL, old_dentry); + fsnotify_move(old_dir->d_inode, old_name, old_len, + new_dir->d_inode, old_dentry->d_name.name, old_dentry->d_name.len, + S_ISDIR(old_dentry->d_inode->i_mode), NULL, old_dentry); fsnotify_oldname_free(old_name); unlock_rename(new_dir, old_dir); dput(dentry); diff --git a/fs/namei.c b/fs/namei.c index d62fdc8..f220441 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2634,6 +2634,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry, int error; int is_dir = S_ISDIR(old_dentry->d_inode->i_mode); const char *old_name; + int old_len; if (old_dentry->d_inode == new_dentry->d_inode) return 0; @@ -2656,6 +2657,7 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry, vfs_dq_init(new_dir); old_name = fsnotify_oldname_init(old_dentry->d_name.name); + old_len = old_dentry->d_name.len; if (is_dir) error = vfs_rename_dir(old_dir,old_dentry,new_dir,new_dentry); @@ -2663,8 +2665,10 @@ int vfs_rename(struct inode *old_dir, struct dentry *old_dentry, error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry); if (!error) { const char *new_name = old_dentry->d_name.name; - fsnotify_move(old_dir, new_dir, old_name, new_name, is_dir, - new_dentry->d_inode, old_dentry); + int new_len = old_dentry->d_name.len; + fsnotify_move(old_dir, old_name, old_len, + new_dir, new_name, new_len, + is_dir, new_dentry->d_inode, old_dentry); } fsnotify_oldname_free(old_name); diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index 037e878..17cd902 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -76,55 +76,164 @@ void __fsnotify_update_child_dentry_flags(struct inode *inode) spin_unlock(&dcache_lock); } -/* Notify this dentry's parent about a child's events. */ -void __fsnotify_parent(struct dentry *dentry, __u32 mask) +/* + * Does the work when updating descents of a dentry + */ +static void fsnotify_update_descents(struct dentry *dentry, bool watched) { - struct dentry *parent; - struct inode *p_inode; - bool send = false; - bool should_update_children = false; + struct dentry *child; + + list_for_each_entry(child, &dentry->d_subdirs, d_u.d_child) { + if (!child->d_inode) + continue; + + spin_lock(&child->d_lock); + + if (watched) + child->d_flags |= DCACHE_FSNOTIFY_ANCESTOR_WATCHED; + else + child->d_flags &= ~DCACHE_FSNOTIFY_ANCESTOR_WATCHED; + + if (!fsnotify_inode_watches_descents(child->d_inode)) { + fsnotify_update_descents(child, watched); + } + + spin_unlock(&child->d_lock); + } +} - if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED)) +/* do something equivalent to __fsnotify_update_child_dentry_flags, but for a tree watch */ +void __fsnotify_update_descents(struct dentry *dentry, bool lock) +{ + bool should_be = fsnotify_inode_watches_descents(dentry->d_inode) + || (dentry->d_flags & DCACHE_FSNOTIFY_ANCESTOR_WATCHED); + bool is; + + /* any child of this dentry */ + struct dentry *onechild = list_entry(dentry->d_subdirs.next, struct dentry, d_u.d_child); + + if (onechild != dentry) + is = onechild->d_flags & DCACHE_FSNOTIFY_ANCESTOR_WATCHED; + else + return; /* no child dentries here */ + + if (should_be == is) return; - spin_lock(&dentry->d_lock); - parent = dentry->d_parent; - p_inode = parent->d_inode; + if (lock) + spin_lock(&dentry->d_lock); + + fsnotify_update_descents(dentry, should_be); + + if (lock) + spin_unlock(&dentry->d_lock); +} + +/* Notify this dentry's ancestors about a child's events. */ +void __fsnotify_ancestors(struct dentry *dentry, __u32 mask) +{ + if (dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED) { + struct dentry *parent; + struct inode *p_inode; + bool should_update_children = false; + bool send = false; + + spin_lock(&dentry->d_lock); + + parent = dentry->d_parent; + p_inode = parent->d_inode; - if (fsnotify_inode_watches_children(p_inode)) { - if (p_inode->i_fsnotify_mask & mask) { + if (fsnotify_inode_watches_children(p_inode)) { + if (p_inode->i_fsnotify_mask & mask) { + dget(parent); + send = true; + } + } else { + /* + * The parent doesn't care about events on it's children but + * at least one child thought it did. We need to run all the + * children and update their d_flags to let them know p_inode + * doesn't care about them any more. + */ dget(parent); - send = true; + should_update_children = true; } - } else { - /* - * The parent doesn't care about events on it's children but - * at least one child thought it did. We need to run all the - * children and update their d_flags to let them know p_inode - * doesn't care about them any more. - */ - dget(parent); - should_update_children = true; - } - spin_unlock(&dentry->d_lock); + spin_unlock(&dentry->d_lock); - if (send) { - /* we are notifying a parent so come up with the new mask which - * specifies these are events which came from a child. */ - mask |= FS_EVENT_ON_CHILD; + if (send) { + /* we are notifying a parent so come up with the new mask which + * specifies these are events which came from a child. */ + fsnotify(p_inode, mask | FS_EVENT_ON_TREE, dentry->d_inode, + FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); + dput(parent); + } - fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE, - dentry->d_name.name, 0); - dput(parent); + if (unlikely(should_update_children)) { + __fsnotify_update_child_dentry_flags(p_inode); + dput(parent); + } } - if (unlikely(should_update_children)) { - __fsnotify_update_child_dentry_flags(p_inode); - dput(parent); + fsnotify_far_ancestors(dentry->d_parent, dentry->d_name.name, dentry->d_name.len, mask); +} +EXPORT_SYMBOL_GPL(__fsnotify_ancestors); + +/* + * notify tree-watching ancestors + * @dentry: The dentry the walkup should start with + * @file_name: The string that should be appended to this dentries' path + * @file_len: The length of this string + */ +void fsnotify_far_ancestors(struct dentry *dentry, const unsigned char *file_name, int file_len, __u32 mask) +{ + if (dentry->d_flags & DCACHE_FSNOTIFY_ANCESTOR_WATCHED) { + char path[PATH_MAX]; + char *pathptr = path + PATH_MAX - 1 - file_len; + struct dentry *test_dentry, *next_update = NULL; + struct inode *d_inode, *test_inode; + + strcpy(pathptr, file_name); + + spin_lock(&dentry->d_lock); + d_inode = dentry->d_inode; + + test_dentry = dentry; + test_inode = d_inode; + do { + dget(test_dentry); + if (fsnotify_inode_watches_descents(test_inode)) { + if (test_inode->i_fsnotify_mask & mask) { + dget(dentry); + spin_unlock(&dentry->d_lock); + inotify_inode_queue_event(test_inode, mask, 0, pathptr, + d_inode); + fsnotify(test_inode, mask | FS_EVENT_ON_DESCENT, d_inode, + FSNOTIFY_EVENT_INODE, pathptr, 0); + spin_lock(&dentry->d_lock); + dput(dentry); + } + } else { + next_update = test_dentry; + } + + pathptr -= test_dentry->d_name.len + 1; + strcpy(pathptr, test_dentry->d_name.name); + pathptr[test_dentry->d_name.len] = '/'; + dput(test_dentry); + + test_dentry = test_dentry->d_parent; + test_inode = test_dentry->d_inode; + } while (test_dentry->d_flags & DCACHE_FSNOTIFY_ANCESTOR_WATCHED || + fsnotify_inode_watches_descents(test_inode)); + + spin_unlock(&dentry->d_lock); + + if (next_update) + __fsnotify_update_descents(next_update, true); } } -EXPORT_SYMBOL_GPL(__fsnotify_parent); +EXPORT_SYMBOL_GPL(fsnotify_far_ancestors); /* * This is the main call to fsnotify. The VFS calls into hook specific functions @@ -137,8 +246,8 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const struct fsnotify_group *group; struct fsnotify_event *event = NULL; int idx; - /* global tests shouldn't care about events on child only the specific event */ - __u32 test_mask = (mask & ~FS_EVENT_ON_CHILD); + /* global tests shouldn't care about events on child/descent only the specific event */ + __u32 test_mask = mask & ~FS_EVENT_ON_TREE; if (list_empty(&fsnotify_groups)) return; @@ -155,7 +264,10 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const */ idx = srcu_read_lock(&fsnotify_grp_srcu); list_for_each_entry_rcu(group, &fsnotify_groups, group_list) { - if (test_mask & group->mask) { + bool send = test_mask & group->mask; + send = send && (!(mask & FS_EVENT_ON_TREE) || + (mask & group->mask) & FS_EVENT_ON_TREE); + if (send) { if (!group->ops->should_send_event(group, to_tell, mask)) continue; if (!event) { diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h index 4dc2408..7a587a8 100644 --- a/fs/notify/fsnotify.h +++ b/fs/notify/fsnotify.h @@ -26,6 +26,7 @@ extern void fsnotify_clear_marks_by_inode(struct inode *inode); * about events that happen to its children. */ extern void __fsnotify_update_child_dentry_flags(struct inode *inode); +/* same here for tree watches */ /* allocate and destroy and event holder to attach events to notification/access queues */ extern struct fsnotify_event_holder *fsnotify_alloc_event_holder(void); diff --git a/fs/notify/inode_mark.c b/fs/notify/inode_mark.c index 3165d85..67ad9cb 100644 --- a/fs/notify/inode_mark.c +++ b/fs/notify/inode_mark.c @@ -124,16 +124,31 @@ static void fsnotify_recalc_inode_mask_locked(struct inode *inode) } /* + * updates the descents as needed + */ +static void fsnotify_update_descents_as_needed(struct inode *inode, bool tree) +{ + if (tree) { + struct dentry *dentry; + list_for_each_entry(dentry, &inode->i_dentry, d_alias) { + __fsnotify_update_descents(dentry, true); + } + } else { + __fsnotify_update_child_dentry_flags(inode); + } +} + +/* * Recalculate the inode->i_fsnotify_mask, or the mask of all FS_* event types * any notifier is interested in hearing for this inode. */ -void fsnotify_recalc_inode_mask(struct inode *inode) +void fsnotify_recalc_inode_mask(struct inode *inode, bool tree) { spin_lock(&inode->i_lock); fsnotify_recalc_inode_mask_locked(inode); spin_unlock(&inode->i_lock); - __fsnotify_update_child_dentry_flags(inode); + fsnotify_update_descents_as_needed(inode, tree); } /* @@ -180,6 +195,12 @@ void fsnotify_destroy_mark_by_entry(struct fsnotify_mark_entry *entry) * inode->i_fsnotify_mask */ fsnotify_recalc_inode_mask_locked(inode); + if ((entry->mask & ~inode->i_fsnotify_mask) & FS_EVENT_ON_DESCENT) { + struct dentry *dentry; + list_for_each_entry(dentry, &inode->i_dentry, d_alias) { + __fsnotify_update_descents(dentry, true); + } + } spin_unlock(&inode->i_lock); spin_unlock(&group->mark_lock); @@ -195,14 +216,16 @@ void fsnotify_destroy_mark_by_entry(struct fsnotify_mark_entry *entry) /* * __fsnotify_update_child_dentry_flags(inode); + * or __fsnotify_update_descents; * * I really want to call that, but we can't, we have no idea if the inode * still exists the second we drop the entry->lock. * * The next time an event arrive to this inode from one of it's children - * __fsnotify_parent will see that the inode doesn't care about it's - * children and will update all of these flags then. So really this - * is just a lazy update (and could be a perf win...) + * __fsnotify_ancestors resp. fsnotify_far_ancestors will see that the + * inode doesn't care about it's children and will update all of these + * flags then. So really this is just a lazy update (and could be a + * perf win...) */ @@ -336,6 +359,17 @@ int fsnotify_add_mark(struct fsnotify_mark_entry *entry, atomic_inc(&group->num_marks); + if (entry->mask & FS_EVENT_ON_DESCENT) { + struct dentry *dentry; + + /* + * as this is supposed to be a directory, this should only loop once + * but it actually doesn't matter if Mr. Evil gives a file as input + */ + list_for_each_entry(dentry, &inode->i_dentry, d_alias) { + __fsnotify_update_dcache_flags(dentry); + } + } fsnotify_recalc_inode_mask_locked(inode); } @@ -348,7 +382,7 @@ int fsnotify_add_mark(struct fsnotify_mark_entry *entry, iput(inode); fsnotify_put_mark(lentry); } else { - __fsnotify_update_child_dentry_flags(inode); + fsnotify_update_descents_as_needed(inode, entry->mask & FS_EVENT_ON_DESCENT); } return ret; diff --git a/include/linux/dcache.h b/include/linux/dcache.h index 30b93b2..131b8f9 100644 --- a/include/linux/dcache.h +++ b/include/linux/dcache.h @@ -184,7 +184,8 @@ d_iput: no no no yes #define DCACHE_COOKIE 0x0040 /* For use by dcookie subsystem */ -#define DCACHE_FSNOTIFY_PARENT_WATCHED 0x0080 /* Parent inode is watched by some fsnotify listener */ +#define DCACHE_FSNOTIFY_PARENT_WATCHED 0x0080 /* Parent inode is watched by some fsnotify listener */ +#define DCACHE_FSNOTIFY_ANCESTOR_WATCHED 0x0100 /* Ancestor inode is watched by some tree-watching fsnotify listener */ extern spinlock_t dcache_lock; extern seqlock_t rename_lock; diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h index 936f9aa..4946243 100644 --- a/include/linux/fsnotify.h +++ b/include/linux/fsnotify.h @@ -16,6 +16,14 @@ #include #include +/* Wrapper for fsnotify_far_ancestors, getting the dentries' name */ +static inline void fsnotify_far_ancestors_getinfo(struct dentry *dentry, __u32 mask) +{ + const char *name = dentry->d_name.name; + const int len = dentry->d_name.len; + fsnotify_far_ancestors(dentry->d_parent, name, len, mask); +} + /* * fsnotify_d_instantiate - instantiate a dentry for inode * Called with dcache_lock held. @@ -28,10 +36,10 @@ static inline void fsnotify_d_instantiate(struct dentry *entry, inotify_d_instantiate(entry, inode); } -/* Notify this dentry's parent about a child's events. */ -static inline void fsnotify_parent(struct dentry *dentry, __u32 mask) +/* Notify this dentry's ancestors about a child's events. */ +static inline void fsnotify_ancestors(struct dentry *dentry, __u32 mask) { - __fsnotify_parent(dentry, mask); + __fsnotify_ancestors(dentry, mask); inotify_dentry_parent_queue_event(dentry, mask, 0, dentry->d_name.name); } @@ -46,7 +54,8 @@ static inline void fsnotify_d_move(struct dentry *entry) * On move we need to update entry->d_flags to indicate if the new parent * cares about events from this entry. */ - __fsnotify_update_dcache_flags(entry); + __fsnotify_update_dcache_flags(entry); + __fsnotify_update_descents(entry, false); inotify_d_move(entry); } @@ -64,15 +73,16 @@ static inline void fsnotify_link_count(struct inode *inode) /* * fsnotify_move - file old_name at old_dir was moved to new_name at new_dir */ -static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir, - const char *old_name, const char *new_name, +static inline void fsnotify_move(struct inode *old_dir, const char *old_name, int old_len, + struct inode *new_dir, const char *new_name, int new_len, int isdir, struct inode *target, struct dentry *moved) { + struct dentry *alias; struct inode *source = moved->d_inode; u32 in_cookie = inotify_get_cookie(); u32 fs_cookie = fsnotify_get_cookie(); - __u32 old_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_FROM); - __u32 new_dir_mask = (FS_EVENT_ON_CHILD | FS_MOVED_TO); + __u32 old_dir_mask = FS_EVENT_ON_TREE | FS_MOVED_FROM; + __u32 new_dir_mask = FS_EVENT_ON_TREE | FS_MOVED_TO; if (old_dir == new_dir) old_dir_mask |= FS_DN_RENAME; @@ -88,6 +98,14 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir, inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, in_cookie, new_name, source); + list_for_each_entry(alias, &new_dir->i_dentry, d_alias) { + fsnotify_far_ancestors(alias, new_name, new_len, new_dir_mask); + } + + list_for_each_entry(alias, &old_dir->i_dentry, d_alias) { + fsnotify_far_ancestors(alias, old_name, old_len, old_dir_mask); + } + fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name, fs_cookie); fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name, fs_cookie); @@ -124,7 +142,7 @@ static inline void fsnotify_nameremove(struct dentry *dentry, int isdir) if (isdir) mask |= FS_IN_ISDIR; - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); } /* @@ -148,6 +166,7 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) dentry->d_inode); audit_inode_child(dentry->d_name.name, dentry, inode); + fsnotify_far_ancestors_getinfo(dentry, FS_CREATE); fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); } @@ -158,12 +177,13 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry) */ static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct dentry *new_dentry) { + fsnotify_far_ancestors_getinfo(new_dentry, IN_CREATE); + fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); + inotify_inode_queue_event(dir, IN_CREATE, 0, new_dentry->d_name.name, inode); fsnotify_link_count(inode); audit_inode_child(new_dentry->d_name.name, new_dentry, dir); - - fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name, 0); } /* @@ -177,6 +197,7 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry) inotify_inode_queue_event(inode, mask, 0, dentry->d_name.name, d_inode); audit_inode_child(dentry->d_name.name, dentry, inode); + fsnotify_far_ancestors_getinfo(dentry, mask); fsnotify(inode, mask, d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name, 0); } @@ -193,7 +214,7 @@ static inline void fsnotify_access(struct dentry *dentry) inotify_inode_queue_event(inode, mask, 0, NULL, NULL); - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); } @@ -210,7 +231,7 @@ static inline void fsnotify_modify(struct dentry *dentry) inotify_inode_queue_event(inode, mask, 0, NULL, NULL); - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); } @@ -227,7 +248,7 @@ static inline void fsnotify_open(struct dentry *dentry) inotify_inode_queue_event(inode, mask, 0, NULL, NULL); - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); } @@ -246,7 +267,7 @@ static inline void fsnotify_close(struct file *file) inotify_inode_queue_event(inode, mask, 0, NULL, NULL); - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL, 0); } @@ -263,7 +284,7 @@ static inline void fsnotify_xattr(struct dentry *dentry) inotify_inode_queue_event(inode, mask, 0, NULL, NULL); - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); } @@ -299,7 +320,7 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid) mask |= FS_IN_ISDIR; inotify_inode_queue_event(inode, mask, 0, NULL, NULL); - fsnotify_parent(dentry, mask); + fsnotify_ancestors(dentry, mask); fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL, 0); } } diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 4d6f47b..1bea473 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -48,8 +48,12 @@ #define FS_DN_MULTISHOT 0x20000000 /* dnotify multishot */ /* This inode cares about things that happen to its children. Always set for - * dnotify and inotify. */ + * dnotify. */ #define FS_EVENT_ON_CHILD 0x08000000 +/* This inode cares about things that happen to some of its descents. */ +#define FS_EVENT_ON_DESCENT 0x10000000 + +#define FS_EVENT_ON_TREE (FS_EVENT_ON_CHILD|FS_EVENT_ON_DESCENT) /* This is a list of all events that may get sent to a parernt based on fs event * happening to inodes inside that directory */ @@ -254,20 +258,32 @@ struct fsnotify_mark_entry { /* main fsnotify call to send events */ extern void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const char *name, u32 cookie); -extern void __fsnotify_parent(struct dentry *dentry, __u32 mask); +extern void __fsnotify_ancestors(struct dentry *dentry, __u32 mask); +extern void fsnotify_far_ancestors(struct dentry *dentry, const unsigned char *file_name, int file_len, __u32 mask); extern void __fsnotify_inode_delete(struct inode *inode); +extern void __fsnotify_update_descents(struct dentry *dentry, bool lock); extern u32 fsnotify_get_cookie(void); -static inline int fsnotify_inode_watches_children(struct inode *inode) +static inline bool fsnotify_inode_watches_something(struct inode *inode, u32 what) { - /* FS_EVENT_ON_CHILD is set if the inode may care */ - if (!(inode->i_fsnotify_mask & FS_EVENT_ON_CHILD)) + /* what is set if the inode may care */ + if (!(inode->i_fsnotify_mask & what)) 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; } +static inline bool fsnotify_inode_watches_children(struct inode *inode) +{ + return fsnotify_inode_watches_something(inode, FS_EVENT_ON_CHILD); +} + +static inline bool fsnotify_inode_watches_descents(struct inode *inode) +{ + return fsnotify_inode_watches_something(inode, FS_EVENT_ON_DESCENT); +} + /* * Update the dentry with a flag indicating the interest of its parent to receive * filesystem events when those events happens to this dentry->d_inode. @@ -275,15 +291,22 @@ static inline int fsnotify_inode_watches_children(struct inode *inode) static inline void __fsnotify_update_dcache_flags(struct dentry *dentry) { struct dentry *parent; - - assert_spin_locked(&dcache_lock); - assert_spin_locked(&dentry->d_lock); + struct inode *p_inode; parent = dentry->d_parent; - if (parent->d_inode && fsnotify_inode_watches_children(parent->d_inode)) - dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; - else - dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; + p_inode = parent->d_inode; + + if (p_inode) { + if (fsnotify_inode_watches_descents(p_inode) || (parent->d_flags & DCACHE_FSNOTIFY_ANCESTOR_WATCHED)) + dentry->d_flags |= DCACHE_FSNOTIFY_ANCESTOR_WATCHED; + else + dentry->d_flags &= ~DCACHE_FSNOTIFY_ANCESTOR_WATCHED; + + if (fsnotify_inode_watches_children(p_inode)) + dentry->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; + else + dentry->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; + } } /* @@ -335,7 +358,7 @@ extern struct fsnotify_event *fsnotify_remove_notify_event(struct fsnotify_group /* functions used to manipulate the marks attached to inodes */ /* run all marks associated with an inode and update inode->i_fsnotify_mask */ -extern void fsnotify_recalc_inode_mask(struct inode *inode); +extern void fsnotify_recalc_inode_mask(struct inode *inode, bool tree); extern void fsnotify_init_mark(struct fsnotify_mark_entry *entry, void (*free_mark)(struct fsnotify_mark_entry *entry)); /* find (and take a reference) to a mark associated with group and inode */ extern struct fsnotify_mark_entry *fsnotify_find_mark_entry(struct fsnotify_group *group, struct inode *inode); @@ -360,7 +383,7 @@ static inline void fsnotify(struct inode *to_tell, __u32 mask, void *data, int d const char *name, u32 cookie) {} -static inline void __fsnotify_parent(struct dentry *dentry, __u32 mask) +static inline void __fsnotify_ancestors(struct dentry *dentry, __u32 mask) {} static inline void __fsnotify_inode_delete(struct inode *inode) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/