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| author | hujianyang <hujianyang@huawei.com> | 2015-01-06 16:10:01 +0800 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2015-01-08 14:47:20 +0100 |
| commit | a425c037f3dd8a56469158ab5f37beb46402d958 (patch) | |
| tree | b412f83087392ee4b96c6be8437c782ad53a775b /fs/overlayfs | |
| parent | 2f83fd8c2849a388082f30d755a75c1e67c4643b (diff) | |
| download | linux-a425c037f3dd8a56469158ab5f37beb46402d958.tar.gz linux-a425c037f3dd8a56469158ab5f37beb46402d958.tar.bz2 linux-a425c037f3dd8a56469158ab5f37beb46402d958.zip | |
ovl: Fix opaque regression in ovl_lookup
Current multi-layer support overlayfs has a regression in
.lookup(). If there is a directory in upperdir and a regular
file has same name in lowerdir in a merged directory, lower
file is hidden and upper directory is set to opaque in former
case. But it is changed in present code.
In lowerdir lookup path, if a found inode is not directory,
the type checking of previous inode is missing. This inode
will be copied to the lowerstack of ovl_entry directly.
That will lead to several wrong conditions, for example,
the reading of the directory in upperdir may return an error
like:
ls: reading directory .: Not a directory
This patch makes the lowerdir lookup path check the opaque
for non-directory file too.
Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/super.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c index 6ca8ea8cb9b2..9e94f4acef1a 100644 --- a/fs/overlayfs/super.c +++ b/fs/overlayfs/super.c @@ -372,7 +372,6 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, bool opaque = false; struct path lowerpath = poe->lowerstack[i]; - opaque = false; this = ovl_lookup_real(lowerpath.dentry, &dentry->d_name); err = PTR_ERR(this); if (IS_ERR(this)) { @@ -395,20 +394,24 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, */ if (i < poe->numlower - 1 && ovl_is_opaquedir(this)) opaque = true; - /* - * If this is a non-directory then stop here. - * - * FIXME: check for opaqueness maybe better done in remove code. - */ - if (!S_ISDIR(this->d_inode->i_mode)) { - opaque = true; - } else if (prev && (!S_ISDIR(prev->d_inode->i_mode) || - !S_ISDIR(this->d_inode->i_mode))) { + + if (prev && (!S_ISDIR(prev->d_inode->i_mode) || + !S_ISDIR(this->d_inode->i_mode))) { + /* + * FIXME: check for upper-opaqueness maybe better done + * in remove code. + */ if (prev == upperdentry) upperopaque = true; dput(this); break; } + /* + * If this is a non-directory then stop here. + */ + if (!S_ISDIR(this->d_inode->i_mode)) + opaque = true; + stack[ctr].dentry = this; stack[ctr].mnt = lowerpath.mnt; ctr++; |