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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 12:48:00 +0300 |
| commit | f3a1568582cc207663a4d5e37da790334372855b (patch) | |
| tree | 00f5b95a4ef417098629a7f16493beb194e5c60c /fs/overlayfs/super.c | |
| parent | ee1d6d37b6b884383b501089be93ce94f2153028 (diff) | |
| download | linux-f3a1568582cc207663a4d5e37da790334372855b.tar.xz | |
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/super.c')
| -rw-r--r-- | fs/overlayfs/super.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index f1647626a882..4882ffb37bae 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -974,7 +974,10 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent) path_put(&workpath); kfree(lowertmp); - oe->__upperdentry = upperpath.dentry; + if (upperpath.dentry) { + oe->__upperdentry = upperpath.dentry; + oe->impure = ovl_is_impuredir(upperpath.dentry); + } for (i = 0; i < numlower; i++) { oe->lowerstack[i].dentry = stack[i].dentry; oe->lowerstack[i].mnt = ufs->lower_mnt[i]; |