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authorAihua Zhang <zhangaihua1@huawei.com>2016-07-07 15:37:53 +0800
committerMiklos Szeredi <mszeredi@redhat.com>2016-09-16 12:44:20 +0200
commitf3fbbb079263bd29ae592478de6808db7e708267 (patch)
treeb34bc4b61e6993806773e4fa57ca26c2db63d9dc /fs/namespace.c
parent598e3c8f72f5b77c84d2cb26cfd936ffb3cfdbaa (diff)
fsnotify: support overlayfs
When an event occurs direct it to the overlay inode instead of the real underlying inode. This will work even if the file was first on the lower layer and then copied up, while the watch is there. This is because the watch is on the overlay inode, which stays the same through the copy-up. For filesystems other than overlayfs this is a no-op, except for the performance impact of an extra pointer dereferece. Verified to work correctly with the inotify/fanotify tests in LTP. Signed-off-by: Aihua Zhang <zhangaihua1@huawei.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs/namespace.c')
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