diff options
Diffstat (limited to 'fs/kernfs')
-rw-r--r-- | fs/kernfs/dir.c | 1 | ||||
-rw-r--r-- | fs/kernfs/file.c | 41 | ||||
-rw-r--r-- | fs/kernfs/kernfs-internal.h | 5 | ||||
-rw-r--r-- | fs/kernfs/mount.c | 11 |
4 files changed, 52 insertions, 6 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c index ac127cd..a693f5b 100644 --- a/fs/kernfs/dir.c +++ b/fs/kernfs/dir.c @@ -714,6 +714,7 @@ struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops, return ERR_PTR(-ENOMEM); ida_init(&root->ino_ida); + INIT_LIST_HEAD(&root->supers); kn = __kernfs_new_node(root, "", S_IFDIR | S_IRUGO | S_IXUGO, KERNFS_DIR); diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c index 5e9a80c..e3d37f6 100644 --- a/fs/kernfs/file.c +++ b/fs/kernfs/file.c @@ -14,6 +14,7 @@ #include <linux/poll.h> #include <linux/pagemap.h> #include <linux/sched.h> +#include <linux/fsnotify.h> #include "kernfs-internal.h" @@ -790,20 +791,48 @@ static unsigned int kernfs_fop_poll(struct file *filp, poll_table *wait) */ void kernfs_notify(struct kernfs_node *kn) { + struct kernfs_root *root = kernfs_root(kn); struct kernfs_open_node *on; + struct kernfs_super_info *info; unsigned long flags; + if (WARN_ON(kernfs_type(kn) != KERNFS_FILE)) + return; + + /* kick poll */ spin_lock_irqsave(&kernfs_open_node_lock, flags); - if (!WARN_ON(kernfs_type(kn) != KERNFS_FILE)) { - on = kn->attr.open; - if (on) { - atomic_inc(&on->event); - wake_up_interruptible(&on->poll); - } + on = kn->attr.open; + if (on) { + atomic_inc(&on->event); + wake_up_interruptible(&on->poll); } spin_unlock_irqrestore(&kernfs_open_node_lock, flags); + + /* kick fsnotify */ + mutex_lock(&kernfs_mutex); + + list_for_each_entry(info, &root->supers, node) { + struct inode *inode; + struct dentry *dentry; + + inode = ilookup(info->sb, kn->ino); + if (!inode) + continue; + + dentry = d_find_any_alias(inode); + if (dentry) { + fsnotify_parent(NULL, dentry, FS_MODIFY); + fsnotify(inode, FS_MODIFY, inode, FSNOTIFY_EVENT_INODE, + NULL, 0); + dput(dentry); + } + + iput(inode); + } + + mutex_unlock(&kernfs_mutex); } EXPORT_SYMBOL_GPL(kernfs_notify); diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h index 8be13b2..dc84a3e 100644 --- a/fs/kernfs/kernfs-internal.h +++ b/fs/kernfs/kernfs-internal.h @@ -49,6 +49,8 @@ static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn) * mount.c */ struct kernfs_super_info { + struct super_block *sb; + /* * The root associated with this super_block. Each super_block is * identified by the root and ns it's associated with. @@ -62,6 +64,9 @@ struct kernfs_super_info { * an array and compare kernfs_node tag against every entry. */ const void *ns; + + /* anchored at kernfs_root->supers, protected by kernfs_mutex */ + struct list_head node; }; #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info)) diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index 6a5f04a..f25a7c0 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -68,6 +68,7 @@ static int kernfs_fill_super(struct super_block *sb) struct inode *inode; struct dentry *root; + info->sb = sb; sb->s_blocksize = PAGE_CACHE_SIZE; sb->s_blocksize_bits = PAGE_CACHE_SHIFT; sb->s_magic = SYSFS_MAGIC; @@ -166,12 +167,18 @@ struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, *new_sb_created = !sb->s_root; if (!sb->s_root) { + struct kernfs_super_info *info = kernfs_info(sb); + error = kernfs_fill_super(sb); if (error) { deactivate_locked_super(sb); return ERR_PTR(error); } sb->s_flags |= MS_ACTIVE; + + mutex_lock(&kernfs_mutex); + list_add(&info->node, &root->supers); + mutex_unlock(&kernfs_mutex); } return dget(sb->s_root); @@ -190,6 +197,10 @@ void kernfs_kill_sb(struct super_block *sb) struct kernfs_super_info *info = kernfs_info(sb); struct kernfs_node *root_kn = sb->s_root->d_fsdata; + mutex_lock(&kernfs_mutex); + list_del(&info->node); + mutex_unlock(&kernfs_mutex); + /* * Remove the superblock from fs_supers/s_instances * so we can't find it, before freeing kernfs_super_info. |