1c82ee6d3SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 290586523SEric Paris /* 390586523SEric Paris * Copyright (C) 2008 Red Hat, Inc., Eric Paris <eparis@redhat.com> 490586523SEric Paris */ 590586523SEric Paris 690586523SEric Paris #include <linux/dcache.h> 790586523SEric Paris #include <linux/fs.h> 85a0e3ad6STejun Heo #include <linux/gfp.h> 990586523SEric Paris #include <linux/init.h> 1090586523SEric Paris #include <linux/module.h> 117131485aSEric Paris #include <linux/mount.h> 1290586523SEric Paris #include <linux/srcu.h> 1390586523SEric Paris 1490586523SEric Paris #include <linux/fsnotify_backend.h> 1590586523SEric Paris #include "fsnotify.h" 1690586523SEric Paris 1790586523SEric Paris /* 183be25f49SEric Paris * Clear all of the marks on an inode when it is being evicted from core 193be25f49SEric Paris */ 203be25f49SEric Paris void __fsnotify_inode_delete(struct inode *inode) 213be25f49SEric Paris { 223be25f49SEric Paris fsnotify_clear_marks_by_inode(inode); 233be25f49SEric Paris } 243be25f49SEric Paris EXPORT_SYMBOL_GPL(__fsnotify_inode_delete); 253be25f49SEric Paris 26ca9c726eSAndreas Gruenbacher void __fsnotify_vfsmount_delete(struct vfsmount *mnt) 27ca9c726eSAndreas Gruenbacher { 28ca9c726eSAndreas Gruenbacher fsnotify_clear_marks_by_mount(mnt); 29ca9c726eSAndreas Gruenbacher } 30ca9c726eSAndreas Gruenbacher 31ebb3b47eSJan Kara /** 32ebb3b47eSJan Kara * fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes. 33ebb3b47eSJan Kara * @sb: superblock being unmounted. 34ebb3b47eSJan Kara * 35ebb3b47eSJan Kara * Called during unmount with no locks held, so needs to be safe against 36ebb3b47eSJan Kara * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block. 37ebb3b47eSJan Kara */ 381e6cb723SAmir Goldstein static void fsnotify_unmount_inodes(struct super_block *sb) 39ebb3b47eSJan Kara { 40ebb3b47eSJan Kara struct inode *inode, *iput_inode = NULL; 41ebb3b47eSJan Kara 42ebb3b47eSJan Kara spin_lock(&sb->s_inode_list_lock); 43ebb3b47eSJan Kara list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { 44ebb3b47eSJan Kara /* 45ebb3b47eSJan Kara * We cannot __iget() an inode in state I_FREEING, 46ebb3b47eSJan Kara * I_WILL_FREE, or I_NEW which is fine because by that point 47ebb3b47eSJan Kara * the inode cannot have any associated watches. 48ebb3b47eSJan Kara */ 49ebb3b47eSJan Kara spin_lock(&inode->i_lock); 50ebb3b47eSJan Kara if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) { 51ebb3b47eSJan Kara spin_unlock(&inode->i_lock); 52ebb3b47eSJan Kara continue; 53ebb3b47eSJan Kara } 54ebb3b47eSJan Kara 55ebb3b47eSJan Kara /* 56ebb3b47eSJan Kara * If i_count is zero, the inode cannot have any watches and 571751e8a6SLinus Torvalds * doing an __iget/iput with SB_ACTIVE clear would actually 58ebb3b47eSJan Kara * evict all inodes with zero i_count from icache which is 59ebb3b47eSJan Kara * unnecessarily violent and may in fact be illegal to do. 60ebb3b47eSJan Kara */ 61ebb3b47eSJan Kara if (!atomic_read(&inode->i_count)) { 62ebb3b47eSJan Kara spin_unlock(&inode->i_lock); 63ebb3b47eSJan Kara continue; 64ebb3b47eSJan Kara } 65ebb3b47eSJan Kara 66ebb3b47eSJan Kara __iget(inode); 67ebb3b47eSJan Kara spin_unlock(&inode->i_lock); 68ebb3b47eSJan Kara spin_unlock(&sb->s_inode_list_lock); 69ebb3b47eSJan Kara 70ebb3b47eSJan Kara if (iput_inode) 71ebb3b47eSJan Kara iput(iput_inode); 72ebb3b47eSJan Kara 73ebb3b47eSJan Kara /* for each watch, send FS_UNMOUNT and then remove it */ 74ebb3b47eSJan Kara fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0); 75ebb3b47eSJan Kara 76ebb3b47eSJan Kara fsnotify_inode_delete(inode); 77ebb3b47eSJan Kara 78ebb3b47eSJan Kara iput_inode = inode; 79ebb3b47eSJan Kara 8004646aebSEric Sandeen cond_resched(); 81ebb3b47eSJan Kara spin_lock(&sb->s_inode_list_lock); 82ebb3b47eSJan Kara } 83ebb3b47eSJan Kara spin_unlock(&sb->s_inode_list_lock); 84ebb3b47eSJan Kara 85ebb3b47eSJan Kara if (iput_inode) 86ebb3b47eSJan Kara iput(iput_inode); 87721fb6fbSJan Kara /* Wait for outstanding inode references from connectors */ 88721fb6fbSJan Kara wait_var_event(&sb->s_fsnotify_inode_refs, 89721fb6fbSJan Kara !atomic_long_read(&sb->s_fsnotify_inode_refs)); 90ebb3b47eSJan Kara } 91ebb3b47eSJan Kara 921e6cb723SAmir Goldstein void fsnotify_sb_delete(struct super_block *sb) 931e6cb723SAmir Goldstein { 941e6cb723SAmir Goldstein fsnotify_unmount_inodes(sb); 951e6cb723SAmir Goldstein fsnotify_clear_marks_by_sb(sb); 961e6cb723SAmir Goldstein } 971e6cb723SAmir Goldstein 983be25f49SEric Paris /* 99c28f7e56SEric Paris * Given an inode, first check if we care what happens to our children. Inotify 100c28f7e56SEric Paris * and dnotify both tell their parents about events. If we care about any event 101c28f7e56SEric Paris * on a child we run all of our children and set a dentry flag saying that the 102c28f7e56SEric Paris * parent cares. Thus when an event happens on a child it can quickly tell if 103c28f7e56SEric Paris * if there is a need to find a parent and send the event to the parent. 104c28f7e56SEric Paris */ 105c28f7e56SEric Paris void __fsnotify_update_child_dentry_flags(struct inode *inode) 106c28f7e56SEric Paris { 107c28f7e56SEric Paris struct dentry *alias; 108c28f7e56SEric Paris int watched; 109c28f7e56SEric Paris 110c28f7e56SEric Paris if (!S_ISDIR(inode->i_mode)) 111c28f7e56SEric Paris return; 112c28f7e56SEric Paris 113c28f7e56SEric Paris /* determine if the children should tell inode about their events */ 114c28f7e56SEric Paris watched = fsnotify_inode_watches_children(inode); 115c28f7e56SEric Paris 116873feea0SNick Piggin spin_lock(&inode->i_lock); 117c28f7e56SEric Paris /* run all of the dentries associated with this inode. Since this is a 118c28f7e56SEric Paris * directory, there damn well better only be one item on this list */ 119946e51f2SAl Viro hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { 120c28f7e56SEric Paris struct dentry *child; 121c28f7e56SEric Paris 122c28f7e56SEric Paris /* run all of the children of the original inode and fix their 123c28f7e56SEric Paris * d_flags to indicate parental interest (their parent is the 124c28f7e56SEric Paris * original inode) */ 1252fd6b7f5SNick Piggin spin_lock(&alias->d_lock); 126946e51f2SAl Viro list_for_each_entry(child, &alias->d_subdirs, d_child) { 127c28f7e56SEric Paris if (!child->d_inode) 128c28f7e56SEric Paris continue; 129c28f7e56SEric Paris 1302fd6b7f5SNick Piggin spin_lock_nested(&child->d_lock, DENTRY_D_LOCK_NESTED); 131c28f7e56SEric Paris if (watched) 132c28f7e56SEric Paris child->d_flags |= DCACHE_FSNOTIFY_PARENT_WATCHED; 133c28f7e56SEric Paris else 134c28f7e56SEric Paris child->d_flags &= ~DCACHE_FSNOTIFY_PARENT_WATCHED; 135c28f7e56SEric Paris spin_unlock(&child->d_lock); 136c28f7e56SEric Paris } 1372fd6b7f5SNick Piggin spin_unlock(&alias->d_lock); 138c28f7e56SEric Paris } 139873feea0SNick Piggin spin_unlock(&inode->i_lock); 140c28f7e56SEric Paris } 141c28f7e56SEric Paris 142c28f7e56SEric Paris /* Notify this dentry's parent about a child's events. */ 14312c7f9dcSAl Viro int __fsnotify_parent(const struct path *path, struct dentry *dentry, __u32 mask) 144c28f7e56SEric Paris { 145c28f7e56SEric Paris struct dentry *parent; 146c28f7e56SEric Paris struct inode *p_inode; 14752420392SEric Paris int ret = 0; 148c28f7e56SEric Paris 14972acc854SAndreas Gruenbacher if (!dentry) 1502069601bSLinus Torvalds dentry = path->dentry; 15128c60e37SEric Paris 152c28f7e56SEric Paris if (!(dentry->d_flags & DCACHE_FSNOTIFY_PARENT_WATCHED)) 15352420392SEric Paris return 0; 154c28f7e56SEric Paris 1554d4eb366SChristoph Hellwig parent = dget_parent(dentry); 156c28f7e56SEric Paris p_inode = parent->d_inode; 157c28f7e56SEric Paris 158b469e7e4SAmir Goldstein if (unlikely(!fsnotify_inode_watches_children(p_inode))) { 1594d4eb366SChristoph Hellwig __fsnotify_update_child_dentry_flags(p_inode); 160b469e7e4SAmir Goldstein } else if (p_inode->i_fsnotify_mask & mask & ALL_FSNOTIFY_EVENTS) { 16149d31c2fSAl Viro struct name_snapshot name; 16249d31c2fSAl Viro 163c28f7e56SEric Paris /* we are notifying a parent so come up with the new mask which 164c28f7e56SEric Paris * specifies these are events which came from a child. */ 165c28f7e56SEric Paris mask |= FS_EVENT_ON_CHILD; 166c28f7e56SEric Paris 16749d31c2fSAl Viro take_dentry_name_snapshot(&name, dentry); 1682069601bSLinus Torvalds if (path) 16952420392SEric Paris ret = fsnotify(p_inode, mask, path, FSNOTIFY_EVENT_PATH, 17025b229dfSAl Viro &name.name, 0); 17128c60e37SEric Paris else 17252420392SEric Paris ret = fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE, 17325b229dfSAl Viro &name.name, 0); 17449d31c2fSAl Viro release_dentry_name_snapshot(&name); 175c28f7e56SEric Paris } 176c28f7e56SEric Paris 177c28f7e56SEric Paris dput(parent); 17852420392SEric Paris 17952420392SEric Paris return ret; 180c28f7e56SEric Paris } 181c28f7e56SEric Paris EXPORT_SYMBOL_GPL(__fsnotify_parent); 182c28f7e56SEric Paris 183fd657170SDan Carpenter static int send_to_group(struct inode *to_tell, 184e637835eSAl Viro __u32 mask, const void *data, 185613a807fSEric Paris int data_is, u32 cookie, 186e43e9c33SAl Viro const struct qstr *file_name, 1879385a84dSJan Kara struct fsnotify_iter_info *iter_info) 1887131485aSEric Paris { 189faa9560aSEric Paris struct fsnotify_group *group = NULL; 190007d1e83SAmir Goldstein __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); 19192183a42SAmir Goldstein __u32 marks_mask = 0; 19292183a42SAmir Goldstein __u32 marks_ignored_mask = 0; 1933dca1a74SAmir Goldstein struct fsnotify_mark *mark; 1943dca1a74SAmir Goldstein int type; 195613a807fSEric Paris 1965b0457adSAmir Goldstein if (WARN_ON(!iter_info->report_mask)) 197faa9560aSEric Paris return 0; 1985ba08e2eSEric Paris 199ce8f76fbSEric Paris /* clear ignored on inode modification */ 200ce8f76fbSEric Paris if (mask & FS_MODIFY) { 2013dca1a74SAmir Goldstein fsnotify_foreach_obj_type(type) { 2023dca1a74SAmir Goldstein if (!fsnotify_iter_should_report_type(iter_info, type)) 2033dca1a74SAmir Goldstein continue; 2043dca1a74SAmir Goldstein mark = iter_info->marks[type]; 2053dca1a74SAmir Goldstein if (mark && 2063dca1a74SAmir Goldstein !(mark->flags & FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY)) 2073dca1a74SAmir Goldstein mark->ignored_mask = 0; 2083dca1a74SAmir Goldstein } 209ce8f76fbSEric Paris } 210613a807fSEric Paris 2113dca1a74SAmir Goldstein fsnotify_foreach_obj_type(type) { 2123dca1a74SAmir Goldstein if (!fsnotify_iter_should_report_type(iter_info, type)) 2133dca1a74SAmir Goldstein continue; 2143dca1a74SAmir Goldstein mark = iter_info->marks[type]; 2153dca1a74SAmir Goldstein /* does the object mark tell us to do something? */ 2163dca1a74SAmir Goldstein if (mark) { 2173dca1a74SAmir Goldstein group = mark->group; 2183dca1a74SAmir Goldstein marks_mask |= mark->mask; 2193dca1a74SAmir Goldstein marks_ignored_mask |= mark->ignored_mask; 2203dca1a74SAmir Goldstein } 221ce8f76fbSEric Paris } 222ce8f76fbSEric Paris 2233dca1a74SAmir Goldstein pr_debug("%s: group=%p to_tell=%p mask=%x marks_mask=%x marks_ignored_mask=%x" 2247053aee2SJan Kara " data=%p data_is=%d cookie=%d\n", 2253dca1a74SAmir Goldstein __func__, group, to_tell, mask, marks_mask, marks_ignored_mask, 2263dca1a74SAmir Goldstein data, data_is, cookie); 227faa9560aSEric Paris 22892183a42SAmir Goldstein if (!(test_mask & marks_mask & ~marks_ignored_mask)) 229613a807fSEric Paris return 0; 230613a807fSEric Paris 2315b0457adSAmir Goldstein return group->ops->handle_event(group, to_tell, mask, data, data_is, 2329385a84dSJan Kara file_name, cookie, iter_info); 2337131485aSEric Paris } 2347131485aSEric Paris 2353427ce71SMiklos Szeredi static struct fsnotify_mark *fsnotify_first_mark(struct fsnotify_mark_connector **connp) 2363427ce71SMiklos Szeredi { 2373427ce71SMiklos Szeredi struct fsnotify_mark_connector *conn; 2383427ce71SMiklos Szeredi struct hlist_node *node = NULL; 2393427ce71SMiklos Szeredi 2403427ce71SMiklos Szeredi conn = srcu_dereference(*connp, &fsnotify_mark_srcu); 2413427ce71SMiklos Szeredi if (conn) 2423427ce71SMiklos Szeredi node = srcu_dereference(conn->list.first, &fsnotify_mark_srcu); 2433427ce71SMiklos Szeredi 2443427ce71SMiklos Szeredi return hlist_entry_safe(node, struct fsnotify_mark, obj_list); 2453427ce71SMiklos Szeredi } 2463427ce71SMiklos Szeredi 2473427ce71SMiklos Szeredi static struct fsnotify_mark *fsnotify_next_mark(struct fsnotify_mark *mark) 2483427ce71SMiklos Szeredi { 2493427ce71SMiklos Szeredi struct hlist_node *node = NULL; 2503427ce71SMiklos Szeredi 2513427ce71SMiklos Szeredi if (mark) 2523427ce71SMiklos Szeredi node = srcu_dereference(mark->obj_list.next, 2533427ce71SMiklos Szeredi &fsnotify_mark_srcu); 2543427ce71SMiklos Szeredi 2553427ce71SMiklos Szeredi return hlist_entry_safe(node, struct fsnotify_mark, obj_list); 2563427ce71SMiklos Szeredi } 2573427ce71SMiklos Szeredi 258c28f7e56SEric Paris /* 259d9a6f30bSAmir Goldstein * iter_info is a multi head priority queue of marks. 260d9a6f30bSAmir Goldstein * Pick a subset of marks from queue heads, all with the 261d9a6f30bSAmir Goldstein * same group and set the report_mask for selected subset. 262d9a6f30bSAmir Goldstein * Returns the report_mask of the selected subset. 263d9a6f30bSAmir Goldstein */ 264d9a6f30bSAmir Goldstein static unsigned int fsnotify_iter_select_report_types( 265d9a6f30bSAmir Goldstein struct fsnotify_iter_info *iter_info) 266d9a6f30bSAmir Goldstein { 26747d9c7ccSAmir Goldstein struct fsnotify_group *max_prio_group = NULL; 26847d9c7ccSAmir Goldstein struct fsnotify_mark *mark; 26947d9c7ccSAmir Goldstein int type; 270d9a6f30bSAmir Goldstein 27147d9c7ccSAmir Goldstein /* Choose max prio group among groups of all queue heads */ 27247d9c7ccSAmir Goldstein fsnotify_foreach_obj_type(type) { 27347d9c7ccSAmir Goldstein mark = iter_info->marks[type]; 27447d9c7ccSAmir Goldstein if (mark && 27547d9c7ccSAmir Goldstein fsnotify_compare_groups(max_prio_group, mark->group) > 0) 27647d9c7ccSAmir Goldstein max_prio_group = mark->group; 277d9a6f30bSAmir Goldstein } 278d9a6f30bSAmir Goldstein 27947d9c7ccSAmir Goldstein if (!max_prio_group) 28047d9c7ccSAmir Goldstein return 0; 28147d9c7ccSAmir Goldstein 28247d9c7ccSAmir Goldstein /* Set the report mask for marks from same group as max prio group */ 283d9a6f30bSAmir Goldstein iter_info->report_mask = 0; 28447d9c7ccSAmir Goldstein fsnotify_foreach_obj_type(type) { 28547d9c7ccSAmir Goldstein mark = iter_info->marks[type]; 28647d9c7ccSAmir Goldstein if (mark && 28747d9c7ccSAmir Goldstein fsnotify_compare_groups(max_prio_group, mark->group) == 0) 28847d9c7ccSAmir Goldstein fsnotify_iter_set_report_type(iter_info, type); 28947d9c7ccSAmir Goldstein } 290d9a6f30bSAmir Goldstein 291d9a6f30bSAmir Goldstein return iter_info->report_mask; 292d9a6f30bSAmir Goldstein } 293d9a6f30bSAmir Goldstein 294d9a6f30bSAmir Goldstein /* 295d9a6f30bSAmir Goldstein * Pop from iter_info multi head queue, the marks that were iterated in the 296d9a6f30bSAmir Goldstein * current iteration step. 297d9a6f30bSAmir Goldstein */ 298d9a6f30bSAmir Goldstein static void fsnotify_iter_next(struct fsnotify_iter_info *iter_info) 299d9a6f30bSAmir Goldstein { 30047d9c7ccSAmir Goldstein int type; 301d9a6f30bSAmir Goldstein 30247d9c7ccSAmir Goldstein fsnotify_foreach_obj_type(type) { 30347d9c7ccSAmir Goldstein if (fsnotify_iter_should_report_type(iter_info, type)) 30447d9c7ccSAmir Goldstein iter_info->marks[type] = 30547d9c7ccSAmir Goldstein fsnotify_next_mark(iter_info->marks[type]); 30647d9c7ccSAmir Goldstein } 307d9a6f30bSAmir Goldstein } 308d9a6f30bSAmir Goldstein 309d9a6f30bSAmir Goldstein /* 31090586523SEric Paris * This is the main call to fsnotify. The VFS calls into hook specific functions 31190586523SEric Paris * in linux/fsnotify.h. Those functions then in turn call here. Here will call 31290586523SEric Paris * out to all of the registered fsnotify_group. Those groups can then use the 31390586523SEric Paris * notification event in whatever means they feel necessary. 31490586523SEric Paris */ 315e637835eSAl Viro int fsnotify(struct inode *to_tell, __u32 mask, const void *data, int data_is, 31625b229dfSAl Viro const struct qstr *file_name, u32 cookie) 31790586523SEric Paris { 3183427ce71SMiklos Szeredi struct fsnotify_iter_info iter_info = {}; 31945a9fb37SAmir Goldstein struct super_block *sb = to_tell->i_sb; 32060f7ed8cSAmir Goldstein struct mount *mnt = NULL; 32145a9fb37SAmir Goldstein __u32 mnt_or_sb_mask = sb->s_fsnotify_mask; 3229385a84dSJan Kara int ret = 0; 323007d1e83SAmir Goldstein __u32 test_mask = (mask & ALL_FSNOTIFY_EVENTS); 32490586523SEric Paris 32560f7ed8cSAmir Goldstein if (data_is == FSNOTIFY_EVENT_PATH) { 326e637835eSAl Viro mnt = real_mount(((const struct path *)data)->mnt); 32745a9fb37SAmir Goldstein mnt_or_sb_mask |= mnt->mnt_fsnotify_mask; 32860f7ed8cSAmir Goldstein } 329b469e7e4SAmir Goldstein /* An event "on child" is not intended for a mount/sb mark */ 330b469e7e4SAmir Goldstein if (mask & FS_EVENT_ON_CHILD) 331b469e7e4SAmir Goldstein mnt_or_sb_mask = 0; 332613a807fSEric Paris 333613a807fSEric Paris /* 3347c49b861SDave Hansen * Optimization: srcu_read_lock() has a memory barrier which can 3357c49b861SDave Hansen * be expensive. It protects walking the *_fsnotify_marks lists. 3367c49b861SDave Hansen * However, if we do not walk the lists, we do not have to do 3377c49b861SDave Hansen * SRCU because we have no references to any objects and do not 3387c49b861SDave Hansen * need SRCU to keep them "alive". 3397c49b861SDave Hansen */ 34045a9fb37SAmir Goldstein if (!to_tell->i_fsnotify_marks && !sb->s_fsnotify_marks && 34145a9fb37SAmir Goldstein (!mnt || !mnt->mnt_fsnotify_marks)) 3427c49b861SDave Hansen return 0; 3437c49b861SDave Hansen /* 344613a807fSEric Paris * if this is a modify event we may need to clear the ignored masks 34560f7ed8cSAmir Goldstein * otherwise return if neither the inode nor the vfsmount/sb care about 346613a807fSEric Paris * this type of event. 347613a807fSEric Paris */ 348613a807fSEric Paris if (!(mask & FS_MODIFY) && 34960f7ed8cSAmir Goldstein !(test_mask & (to_tell->i_fsnotify_mask | mnt_or_sb_mask))) 350613a807fSEric Paris return 0; 3513a9fb89fSEric Paris 3529385a84dSJan Kara iter_info.srcu_idx = srcu_read_lock(&fsnotify_mark_srcu); 3537131485aSEric Paris 35447d9c7ccSAmir Goldstein iter_info.marks[FSNOTIFY_OBJ_TYPE_INODE] = 3553427ce71SMiklos Szeredi fsnotify_first_mark(&to_tell->i_fsnotify_marks); 35645a9fb37SAmir Goldstein iter_info.marks[FSNOTIFY_OBJ_TYPE_SB] = 35745a9fb37SAmir Goldstein fsnotify_first_mark(&sb->s_fsnotify_marks); 3589bdda4e9SAmir Goldstein if (mnt) { 35947d9c7ccSAmir Goldstein iter_info.marks[FSNOTIFY_OBJ_TYPE_VFSMOUNT] = 3603427ce71SMiklos Szeredi fsnotify_first_mark(&mnt->mnt_fsnotify_marks); 3617131485aSEric Paris } 36275c1be48SEric Paris 3638edc6e16SJan Kara /* 36460f7ed8cSAmir Goldstein * We need to merge inode/vfsmount/sb mark lists so that e.g. inode mark 36560f7ed8cSAmir Goldstein * ignore masks are properly reflected for mount/sb mark notifications. 3668edc6e16SJan Kara * That's why this traversal is so complicated... 3678edc6e16SJan Kara */ 368d9a6f30bSAmir Goldstein while (fsnotify_iter_select_report_types(&iter_info)) { 3695b0457adSAmir Goldstein ret = send_to_group(to_tell, mask, data, data_is, cookie, 370e43e9c33SAl Viro file_name, &iter_info); 37184a5b68eSEric Paris 372ff8bcbd0SEric Paris if (ret && (mask & ALL_FSNOTIFY_PERM_EVENTS)) 373ff8bcbd0SEric Paris goto out; 374ff8bcbd0SEric Paris 375d9a6f30bSAmir Goldstein fsnotify_iter_next(&iter_info); 3767131485aSEric Paris } 377ff8bcbd0SEric Paris ret = 0; 378ff8bcbd0SEric Paris out: 3799385a84dSJan Kara srcu_read_unlock(&fsnotify_mark_srcu, iter_info.srcu_idx); 380c4ec54b4SEric Paris 38198b5c10dSJean-Christophe Dubois return ret; 38290586523SEric Paris } 38390586523SEric Paris EXPORT_SYMBOL_GPL(fsnotify); 38490586523SEric Paris 38590586523SEric Paris static __init int fsnotify_init(void) 38690586523SEric Paris { 38775c1be48SEric Paris int ret; 38875c1be48SEric Paris 38966917a31SMatthew Bobrowski BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 25); 39020dee624SEric Paris 39175c1be48SEric Paris ret = init_srcu_struct(&fsnotify_mark_srcu); 39275c1be48SEric Paris if (ret) 39375c1be48SEric Paris panic("initializing fsnotify_mark_srcu"); 39475c1be48SEric Paris 3959dd813c1SJan Kara fsnotify_mark_connector_cachep = KMEM_CACHE(fsnotify_mark_connector, 3969dd813c1SJan Kara SLAB_PANIC); 3979dd813c1SJan Kara 39875c1be48SEric Paris return 0; 39990586523SEric Paris } 40075c1be48SEric Paris core_initcall(fsnotify_init); 401