diff options
Diffstat (limited to 'fs/notify/mark.c')
| -rw-r--r-- | fs/notify/mark.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c index 4a525791a2f3..8e6997e9aebb 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -666,6 +666,56 @@ struct fsnotify_inode_mark_connector { struct list_head conns_list; }; +static struct inode *fsnotify_get_living_inode(struct fsnotify_sb_info *sbinfo) +{ + struct fsnotify_inode_mark_connector *iconn; + struct inode *inode; + + spin_lock(&sbinfo->list_lock); + /* Find the first non-evicting inode */ + list_for_each_entry(iconn, &sbinfo->inode_conn_list, conns_list) { + /* All connectors on the list are still attached to an inode */ + inode = iconn->common.obj; + /* + * For connectors without FSNOTIFY_CONN_FLAG_HAS_IREF + * (evictable marks) corresponding inode may well have 0 + * refcount and can be undergoing eviction. OTOH list_lock + * protects us from the connector getting detached and inode + * freed. So we can poke around the inode safely. + */ + spin_lock(&inode->i_lock); + if (likely( + !(inode_state_read(inode) & (I_FREEING | I_WILL_FREE)))) { + __iget(inode); + spin_unlock(&inode->i_lock); + spin_unlock(&sbinfo->list_lock); + return inode; + } + spin_unlock(&inode->i_lock); + } + spin_unlock(&sbinfo->list_lock); + + return NULL; +} + +/** + * fsnotify_unmount_inodes - an sb is unmounting. Handle any watched inodes. + * @sbinfo: fsnotify info for superblock being unmounted. + * + * Walk all inode connectors for the superblock and free all associated marks. + */ +void fsnotify_unmount_inodes(struct fsnotify_sb_info *sbinfo) +{ + struct inode *inode; + + while ((inode = fsnotify_get_living_inode(sbinfo))) { + fsnotify_inode(inode, FS_UNMOUNT); + fsnotify_clear_marks_by_inode(inode); + iput(inode); + cond_resched(); + } +} + static void fsnotify_init_connector(struct fsnotify_mark_connector *conn, void *obj, unsigned int obj_type) { |