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OpenCloudOS-Kernel
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ovl: move ovl_get_workdir() and ovl_get_lower_layers() 

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi 2017-11-10 09:39:15 +01:00
parent 6e88256e19
commit 520d7c867f
1 changed files with 101 additions and 101 deletions
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202
fs/overlayfs/super.c
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@ -864,58 +864,6 @@ out:
return err;
}
static int ovl_get_workpath(struct ovl_fs *ufs, struct path *upperpath,
struct path *workpath)
{
int err;
err = ovl_mount_dir(ufs->config.workdir, workpath);
if (err)
goto out;
err = -EINVAL;
if (upperpath->mnt != workpath->mnt) {
pr_err("overlayfs: workdir and upperdir must reside under the same mount\n");
goto out;
}
if (!ovl_workdir_ok(workpath->dentry, upperpath->dentry)) {
pr_err("overlayfs: workdir and upperdir must be separate subtrees\n");
goto out;
}
err = -EBUSY;
if (ovl_inuse_trylock(workpath->dentry)) {
ufs->workdir_locked = true;
} else if (ufs->config.index) {
pr_err("overlayfs: workdir is in-use by another mount, mount with '-o index=off' to override exclusive workdir protection.\n");
goto out;
} else {
pr_warn("overlayfs: workdir is in-use by another mount, accessing files from both mounts will result in undefined behavior.\n");
}
ufs->workbasedir = dget(workpath->dentry);
err = 0;
out:
return err;
}
static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath)
{
struct vfsmount *upper_mnt;
upper_mnt = clone_private_mount(upperpath);
if (IS_ERR(upper_mnt)) {
pr_err("overlayfs: failed to clone upperpath\n");
return PTR_ERR(upper_mnt);
}
/* Don't inherit atime flags */
upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME);
ufs->upper_mnt = upper_mnt;
return 0;
}
static int ovl_get_workdir(struct ovl_fs *ufs, struct path *workpath)
{
struct dentry *temp;
@ -971,6 +919,58 @@ static int ovl_get_workdir(struct ovl_fs *ufs, struct path *workpath)
return 0;
}
static int ovl_get_workpath(struct ovl_fs *ufs, struct path *upperpath,
struct path *workpath)
{
int err;
err = ovl_mount_dir(ufs->config.workdir, workpath);
if (err)
goto out;
err = -EINVAL;
if (upperpath->mnt != workpath->mnt) {
pr_err("overlayfs: workdir and upperdir must reside under the same mount\n");
goto out;
}
if (!ovl_workdir_ok(workpath->dentry, upperpath->dentry)) {
pr_err("overlayfs: workdir and upperdir must be separate subtrees\n");
goto out;
}
err = -EBUSY;
if (ovl_inuse_trylock(workpath->dentry)) {
ufs->workdir_locked = true;
} else if (ufs->config.index) {
pr_err("overlayfs: workdir is in-use by another mount, mount with '-o index=off' to override exclusive workdir protection.\n");
goto out;
} else {
pr_warn("overlayfs: workdir is in-use by another mount, accessing files from both mounts will result in undefined behavior.\n");
}
ufs->workbasedir = dget(workpath->dentry);
err = 0;
out:
return err;
}
static int ovl_get_upper(struct ovl_fs *ufs, struct path *upperpath)
{
struct vfsmount *upper_mnt;
upper_mnt = clone_private_mount(upperpath);
if (IS_ERR(upper_mnt)) {
pr_err("overlayfs: failed to clone upperpath\n");
return PTR_ERR(upper_mnt);
}
/* Don't inherit atime flags */
upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME);
ufs->upper_mnt = upper_mnt;
return 0;
}
static int ovl_get_indexdir(struct ovl_fs *ufs, struct ovl_entry *oe,
struct path *upperpath)
{
@ -1008,6 +1008,55 @@ out:
return err;
}
static int ovl_get_lower_layers(struct ovl_fs *ufs, struct path *stack,
unsigned int numlower)
{
int err;
unsigned int i;
err = -ENOMEM;
ufs->lower_layers = kcalloc(numlower, sizeof(struct ovl_layer),
GFP_KERNEL);
if (ufs->lower_layers == NULL)
goto out;
for (i = 0; i < numlower; i++) {
struct vfsmount *mnt;
dev_t dev;
err = get_anon_bdev(&dev);
if (err) {
pr_err("overlayfs: failed to get anonymous bdev for lowerpath\n");
goto out;
}
mnt = clone_private_mount(&stack[i]);
err = PTR_ERR(mnt);
if (IS_ERR(mnt)) {
pr_err("overlayfs: failed to clone lowerpath\n");
free_anon_bdev(dev);
goto out;
}
/*
* Make lower layers R/O. That way fchmod/fchown on lower file
* will fail instead of modifying lower fs.
*/
mnt->mnt_flags |= MNT_READONLY | MNT_NOATIME;
ufs->lower_layers[ufs->numlower].mnt = mnt;
ufs->lower_layers[ufs->numlower].pseudo_dev = dev;
ufs->numlower++;
/* Check if all lower layers are on same sb */
if (i == 0)
ufs->same_sb = mnt->mnt_sb;
else if (ufs->same_sb != mnt->mnt_sb)
ufs->same_sb = NULL;
}
err = 0;
out:
return err;
}
static int ovl_get_lowerstack(struct super_block *sb, struct ovl_fs *ufs,
struct path **stackp, unsigned int *stacklenp)
{
@ -1077,55 +1126,6 @@ out_free_stack:
goto out;
}
static int ovl_get_lower_layers(struct ovl_fs *ufs, struct path *stack,
unsigned int numlower)
{
int err;
unsigned int i;
err = -ENOMEM;
ufs->lower_layers = kcalloc(numlower, sizeof(struct ovl_layer),
GFP_KERNEL);
if (ufs->lower_layers == NULL)
goto out;
for (i = 0; i < numlower; i++) {
struct vfsmount *mnt;
dev_t dev;
err = get_anon_bdev(&dev);
if (err) {
pr_err("overlayfs: failed to get anonymous bdev for lowerpath\n");
goto out;
}
mnt = clone_private_mount(&stack[i]);
err = PTR_ERR(mnt);
if (IS_ERR(mnt)) {
pr_err("overlayfs: failed to clone lowerpath\n");
free_anon_bdev(dev);
goto out;
}
/*
* Make lower layers R/O. That way fchmod/fchown on lower file
* will fail instead of modifying lower fs.
*/
mnt->mnt_flags |= MNT_READONLY | MNT_NOATIME;
ufs->lower_layers[ufs->numlower].mnt = mnt;
ufs->lower_layers[ufs->numlower].pseudo_dev = dev;
ufs->numlower++;
/* Check if all lower layers are on same sb */
if (i == 0)
ufs->same_sb = mnt->mnt_sb;
else if (ufs->same_sb != mnt->mnt_sb)
ufs->same_sb = NULL;
}
err = 0;
out:
return err;
}
static int ovl_fill_super(struct super_block *sb, void *data, int silent)
{
struct path upperpath = { };