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ovl: upper fs should not be R/O

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After importing multi-lower layer support, users could mount a r/o
partition as the left most lowerdir instead of using it as upperdir.
And a r/o upperdir may cause an error like

	overlayfs: failed to create directory ./workdir/work

during mount.

This patch check the *s_flags* of upper fs and return an error if
it is a r/o partition. The checking of *upper_mnt->mnt_sb->s_flags*
can be removed now.

This patch also remove

	/* FIXME: workdir is not needed for a R/O mount */

from ovl_fill_super() because:

1) for upper fs r/o case
Setting a r/o partition as upper is prevented, no need to care about
workdir in this case.

2) for "mount overlay -o ro" with a r/w upper fs case
Users could remount overlayfs to r/w in this case, so workdir should
not be omitted.

Signed-off-by: hujianyang <hujianyang@huawei.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
hujianyang 2015-01-15 13:20:57 +08:00 committed by Miklos Szeredi
parent 6be4506e34
commit 71cbad7e69
1 changed files with 19 additions and 5 deletions
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24
fs/overlayfs/super.c
View file

@ -529,8 +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 || (ufs->upper_mnt->mnt_sb->s_flags & MS_RDONLY)))
if (!(*flags & MS_RDONLY) && !ufs->upper_mnt)
return -EROFS;
return 0;
@ -619,6 +618,15 @@ static int ovl_parse_opt(char *opt, struct ovl_config *config)
return -EINVAL;
}
}
/* Workdir is useless in non-upper mount */
if (!config->upperdir && config->workdir) {
pr_info("overlayfs: option \"workdir=%s\" is useless in a non-upper mount, ignore\n",
config->workdir);
kfree(config->workdir);
config->workdir = NULL;
}
return 0;
}
@ -838,7 +846,6 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_stack_depth = 0;
if (ufs->config.upperdir) {
/* FIXME: workdir is not needed for a R/O mount */
if (!ufs->config.workdir) {
pr_err("overlayfs: missing 'workdir'\n");
goto out_free_config;
@ -848,6 +855,13 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
if (err)
goto out_free_config;
/* Upper fs should not be r/o */
if (upperpath.mnt->mnt_sb->s_flags & MS_RDONLY) {
pr_err("overlayfs: upper fs is r/o, try multi-lower layers mount\n");
err = -EINVAL;
goto out_put_upperpath;
}
err = ovl_mount_dir(ufs->config.workdir, &workpath);
if (err)
goto out_put_upperpath;
@ -939,8 +953,8 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
ufs->numlower++;
}
/* If the upper fs is r/o or nonexistent, we mark overlayfs r/o too */
if (!ufs->upper_mnt || (ufs->upper_mnt->mnt_sb->s_flags & MS_RDONLY))
/* If the upper fs is nonexistent, we mark overlayfs r/o too */
if (!ufs->upper_mnt)
sb->s_flags |= MS_RDONLY;
sb->s_d_op = &ovl_dentry_operations;