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| author |   Amir Goldstein <amir73il@gmail.com> | 2017-05-24 15:29:33 +0300 |
|---|---|---|
| committer |   Miklos Szeredi <mszeredi@redhat.com> | 2017-05-29 11:48:00 +0200 |
| commit | f3a1568582cc207663a4d5e37da790334372855b (patch) | |
| tree | 00f5b95a4ef417098629a7f16493beb194e5c60c /fs/overlayfs/copy_up.c | |
| parent | ovl: mark upper dir with type origin entries "impure" (diff) | |
| download | wireguard-linux-f3a1568582cc207663a4d5e37da790334372855b.tar.xz wireguard-linux-f3a1568582cc207663a4d5e37da790334372855b.zip | |
ovl: mark upper merge dir with type origin entries "impure"
An upper dir is marked "impure" to let ovl_iterate() know that this
directory may contain non pure upper entries whose d_ino may need to be
read from the origin inode.
We already mark a non-merge dir "impure" when moving a non-pure child
entry inside it, to let ovl_iterate() know not to iterate the non-merge
dir directly.
Mark also a merge dir "impure" when moving a non-pure child entry inside
it and when copying up a child entry inside it.
This can be used to optimize ovl_iterate() to perform a "pure merge" of
upper and lower directories, merging the content of the directories,
without having to read d_ino from origin inodes.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/copy_up.c')
| -rw-r--r-- | fs/overlayfs/copy_up.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c index 843ed2a2d7db..7a44533f4bbf 100644 --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -459,6 +459,11 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry, ovl_path_upper(parent, &parentpath); upperdir = parentpath.dentry; + /* Mark parent "impure" because it may now contain non-pure upper */ + err = ovl_set_impure(parent, upperdir); + if (err) + return err; + err = vfs_getattr(&parentpath, &pstat, STATX_ATIME | STATX_MTIME, AT_STATX_SYNC_AS_STAT); if (err) |