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Merge branch 'overlayfs-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs 

Pull two overlayfs fixes from Miklos Szeredi:
 "Overlayfs rmdir() failed to check for emptiness in one case; this was
  introduced in 4.0.  The other bug was there since day one: failure to
  mount if upper fs is full, which bit some OpenWRT folks"

* 'overlayfs-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ovl: mount read-only if workdir can't be created
  ovl: don't remove non-empty opaque directory
wifi-calibration
Linus Torvalds 2015-05-27 09:47:57 -07:00
parent 1b887bf31d cc6f67bcaf
commit 3cfd4ba7d3
3 changed files with 36 additions and 10 deletions
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3
fs/overlayfs/copy_up.c
View File

@ -299,6 +299,9 @@ int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
struct cred *override_cred;
char *link = NULL;
if (WARN_ON(!workdir))
return -EROFS;
ovl_path_upper(parent, &parentpath);
upperdir = parentpath.dentry;

33
fs/overlayfs/dir.c
View File

@ -222,6 +222,9 @@ static struct dentry *ovl_clear_empty(struct dentry *dentry,
struct kstat stat;
int err;
if (WARN_ON(!workdir))
return ERR_PTR(-EROFS);
err = ovl_lock_rename_workdir(workdir, upperdir);
if (err)
goto out;
@ -322,6 +325,9 @@ static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
struct dentry *newdentry;
int err;
if (WARN_ON(!workdir))
return -EROFS;
err = ovl_lock_rename_workdir(workdir, upperdir);
if (err)
goto out;
@ -506,11 +512,28 @@ static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir)
struct dentry *opaquedir = NULL;
int err;
if (is_dir && OVL_TYPE_MERGE_OR_LOWER(ovl_path_type(dentry))) {
opaquedir = ovl_check_empty_and_clear(dentry);
err = PTR_ERR(opaquedir);
if (IS_ERR(opaquedir))
goto out;
if (WARN_ON(!workdir))
return -EROFS;
if (is_dir) {
if (OVL_TYPE_MERGE_OR_LOWER(ovl_path_type(dentry))) {
opaquedir = ovl_check_empty_and_clear(dentry);
err = PTR_ERR(opaquedir);
if (IS_ERR(opaquedir))
goto out;
} else {
LIST_HEAD(list);
/*
* When removing an empty opaque directory, then it
* makes no sense to replace it with an exact replica of
* itself. But emptiness still needs to be checked.
*/
err = ovl_check_empty_dir(dentry, &list);
ovl_cache_free(&list);
if (err)
goto out;
}
}
err = ovl_lock_rename_workdir(workdir, upperdir);

10
fs/overlayfs/super.c
View File

@ -529,7 +529,7 @@ static int ovl_remount(struct super_block *sb, int *flags, char *data)
{
struct ovl_fs *ufs = sb->s_fs_info;
if (!(*flags & MS_RDONLY) && !ufs->upper_mnt)
if (!(*flags & MS_RDONLY) && (!ufs->upper_mnt || !ufs->workdir))
return -EROFS;
return 0;
@ -925,9 +925,10 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
ufs->workdir = ovl_workdir_create(ufs->upper_mnt, workpath.dentry);
err = PTR_ERR(ufs->workdir);
if (IS_ERR(ufs->workdir)) {
pr_err("overlayfs: failed to create directory %s/%s\n",
ufs->config.workdir, OVL_WORKDIR_NAME);
goto out_put_upper_mnt;
pr_warn("overlayfs: failed to create directory %s/%s (errno: %i); mounting read-only\n",
ufs->config.workdir, OVL_WORKDIR_NAME, -err);
sb->s_flags |= MS_RDONLY;
ufs->workdir = NULL;
}
}
@ -997,7 +998,6 @@ out_put_lower_mnt:
kfree(ufs->lower_mnt);
out_put_workdir:
dput(ufs->workdir);
out_put_upper_mnt:
mntput(ufs->upper_mnt);
out_put_lowerpath:
for (i = 0; i < numlower; i++)