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author | Jan Kara <jack@suse.cz> | 2016-12-21 16:40:48 +0100 |
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committer | Jan Kara <jack@suse.cz> | 2017-04-10 17:37:36 +0200 |
commit | ebb3b47e37a4ccef33e6388589a21a5c23d6b40b (patch) | |
tree | 2d6a1d438c8fd28e6ab39e7cd452d696345112d5 /fs/notify/fsnotify.c | |
parent | b1362edfe15b20edd3d116cec521aa420b7afb98 (diff) | |
download | op-kernel-dev-ebb3b47e37a4ccef33e6388589a21a5c23d6b40b.zip op-kernel-dev-ebb3b47e37a4ccef33e6388589a21a5c23d6b40b.tar.gz |
fsnotify: Drop inode_mark.c
inode_mark.c now contains only a single function. Move it to
fs/notify/fsnotify.c and remove inode_mark.c.
Reviewed-by: Miklos Szeredi <mszeredi@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fsnotify.c')
-rw-r--r-- | fs/notify/fsnotify.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c index c4afb6a..01a9f0f 100644 --- a/fs/notify/fsnotify.c +++ b/fs/notify/fsnotify.c @@ -41,6 +41,63 @@ void __fsnotify_vfsmount_delete(struct vfsmount *mnt) fsnotify_clear_marks_by_mount(mnt); } +/** + * fsnotify_unmount_inodes - an sb is unmounting. handle any watched inodes. + * @sb: superblock being unmounted. + * + * Called during unmount with no locks held, so needs to be safe against + * concurrent modifiers. We temporarily drop sb->s_inode_list_lock and CAN block. + */ +void fsnotify_unmount_inodes(struct super_block *sb) +{ + struct inode *inode, *iput_inode = NULL; + + spin_lock(&sb->s_inode_list_lock); + list_for_each_entry(inode, &sb->s_inodes, i_sb_list) { + /* + * We cannot __iget() an inode in state I_FREEING, + * I_WILL_FREE, or I_NEW which is fine because by that point + * the inode cannot have any associated watches. + */ + spin_lock(&inode->i_lock); + if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) { + spin_unlock(&inode->i_lock); + continue; + } + + /* + * If i_count is zero, the inode cannot have any watches and + * doing an __iget/iput with MS_ACTIVE clear would actually + * evict all inodes with zero i_count from icache which is + * unnecessarily violent and may in fact be illegal to do. + */ + if (!atomic_read(&inode->i_count)) { + spin_unlock(&inode->i_lock); + continue; + } + + __iget(inode); + spin_unlock(&inode->i_lock); + spin_unlock(&sb->s_inode_list_lock); + + if (iput_inode) + iput(iput_inode); + + /* for each watch, send FS_UNMOUNT and then remove it */ + fsnotify(inode, FS_UNMOUNT, inode, FSNOTIFY_EVENT_INODE, NULL, 0); + + fsnotify_inode_delete(inode); + + iput_inode = inode; + + spin_lock(&sb->s_inode_list_lock); + } + spin_unlock(&sb->s_inode_list_lock); + + if (iput_inode) + iput(iput_inode); +} + /* * Given an inode, first check if we care what happens to our children. Inotify * and dnotify both tell their parents about events. If we care about any event |