static void ovl_free_fs(struct ovl_fs *ofs)
{
+ struct vfsmount **mounts;
unsigned i;
iput(ofs->workbasedir_trap);
iput(ofs->indexdir_trap);
iput(ofs->workdir_trap);
- iput(ofs->upperdir_trap);
dput(ofs->whiteout);
dput(ofs->indexdir);
dput(ofs->workdir);
dput(ofs->workbasedir);
if (ofs->upperdir_locked)
ovl_inuse_unlock(ovl_upper_mnt(ofs)->mnt_root);
- mntput(ofs->upper_mnt);
- for (i = 1; i < ofs->numlayer; i++) {
+
+ /* Hack! Reuse ofs->layers as a vfsmount array before freeing it */
+ mounts = (struct vfsmount **) ofs->layers;
+ for (i = 0; i < ofs->numlayer; i++) {
iput(ofs->layers[i].trap);
- mntput(ofs->layers[i].mnt);
+ mounts[i] = ofs->layers[i].mnt;
}
+ kern_unmount_array(mounts, ofs->numlayer);
kfree(ofs->layers);
for (i = 0; i < ofs->numfs; i++)
free_anon_bdev(ofs->fs[i].pseudo_dev);
err = ovl_mount_dir_noesc(name, path);
if (err)
- goto out;
+ return err;
err = ovl_check_namelen(path, ofs, name);
if (err)
- goto out_put;
+ return err;
*stack_depth = max(*stack_depth, path->mnt->mnt_sb->s_stack_depth);
ofs->xino_mode = -1;
return 0;
-
-out_put:
- path_put_init(path);
-out:
- return err;
}
/* Workdir should not be subdir of upperdir and vice versa */
}
static int ovl_get_upper(struct super_block *sb, struct ovl_fs *ofs,
- struct path *upperpath)
+ struct ovl_layer *upper_layer, struct path *upperpath)
{
struct vfsmount *upper_mnt;
int err;
if (err)
goto out;
- err = ovl_setup_trap(sb, upperpath->dentry, &ofs->upperdir_trap,
+ err = ovl_setup_trap(sb, upperpath->dentry, &upper_layer->trap,
"upperdir");
if (err)
goto out;
/* Don't inherit atime flags */
upper_mnt->mnt_flags &= ~(MNT_NOATIME | MNT_NODIRATIME | MNT_RELATIME);
- ofs->upper_mnt = upper_mnt;
+ upper_layer->mnt = upper_mnt;
+ upper_layer->idx = 0;
+ upper_layer->fsid = 0;
/*
* Inherit SB_NOSEC flag from upperdir.
}
static int ovl_get_layers(struct super_block *sb, struct ovl_fs *ofs,
- struct path *stack, unsigned int numlower)
+ struct path *stack, unsigned int numlower,
+ struct ovl_layer *layers)
{
int err;
unsigned int i;
- struct ovl_layer *layers;
err = -ENOMEM;
- layers = kcalloc(numlower + 1, sizeof(struct ovl_layer), GFP_KERNEL);
- if (!layers)
- goto out;
- ofs->layers = layers;
-
ofs->fs = kcalloc(numlower + 1, sizeof(struct ovl_sb), GFP_KERNEL);
if (ofs->fs == NULL)
goto out;
/* idx/fsid 0 are reserved for upper fs even with lower only overlay */
ofs->numfs++;
- layers[0].mnt = ovl_upper_mnt(ofs);
- layers[0].idx = 0;
- layers[0].fsid = 0;
- ofs->numlayer = 1;
-
/*
* All lower layers that share the same fs as upper layer, use the same
* pseudo_dev as upper layer. Allocate fs[0].pseudo_dev even for lower
}
static struct ovl_entry *ovl_get_lowerstack(struct super_block *sb,
- struct ovl_fs *ofs)
+ const char *lower, unsigned int numlower,
+ struct ovl_fs *ofs, struct ovl_layer *layers)
{
int err;
- char *lowertmp, *lower;
struct path *stack = NULL;
- unsigned int stacklen, numlower = 0, i;
+ unsigned int i;
struct ovl_entry *oe;
- err = -ENOMEM;
- lowertmp = kstrdup(ofs->config.lowerdir, GFP_KERNEL);
- if (!lowertmp)
- goto out_err;
-
- err = -EINVAL;
- stacklen = ovl_split_lowerdirs(lowertmp);
- if (stacklen > OVL_MAX_STACK) {
- pr_err("too many lower directories, limit is %d\n",
- OVL_MAX_STACK);
- goto out_err;
- } else if (!ofs->config.upperdir && stacklen == 1) {
+ if (!ofs->config.upperdir && numlower == 1) {
pr_err("at least 2 lowerdir are needed while upperdir nonexistent\n");
- goto out_err;
+ return ERR_PTR(-EINVAL);
} else if (!ofs->config.upperdir && ofs->config.nfs_export &&
ofs->config.redirect_follow) {
pr_warn("NFS export requires \"redirect_dir=nofollow\" on non-upper mount, falling back to nfs_export=off.\n");
ofs->config.nfs_export = false;
}
- err = -ENOMEM;
- stack = kcalloc(stacklen, sizeof(struct path), GFP_KERNEL);
+ stack = kcalloc(numlower, sizeof(struct path), GFP_KERNEL);
if (!stack)
- goto out_err;
+ return ERR_PTR(-ENOMEM);
err = -EINVAL;
- lower = lowertmp;
- for (numlower = 0; numlower < stacklen; numlower++) {
- err = ovl_lower_dir(lower, &stack[numlower], ofs,
- &sb->s_stack_depth);
+ for (i = 0; i < numlower; i++) {
+ err = ovl_lower_dir(lower, &stack[i], ofs, &sb->s_stack_depth);
if (err)
goto out_err;
goto out_err;
}
- err = ovl_get_layers(sb, ofs, stack, numlower);
+ err = ovl_get_layers(sb, ofs, stack, numlower, layers);
if (err)
goto out_err;
for (i = 0; i < numlower; i++)
path_put(&stack[i]);
kfree(stack);
- kfree(lowertmp);
return oe;
struct dentry *root_dentry;
struct ovl_entry *oe;
struct ovl_fs *ofs;
+ struct ovl_layer *layers;
struct cred *cred;
+ char *splitlower = NULL;
+ unsigned int numlower;
int err;
sb->s_d_op = &ovl_dentry_operations;
goto out_err;
}
+ err = -ENOMEM;
+ splitlower = kstrdup(ofs->config.lowerdir, GFP_KERNEL);
+ if (!splitlower)
+ goto out_err;
+
+ numlower = ovl_split_lowerdirs(splitlower);
+ if (numlower > OVL_MAX_STACK) {
+ pr_err("too many lower directories, limit is %d\n",
+ OVL_MAX_STACK);
+ goto out_err;
+ }
+
+ layers = kcalloc(numlower + 1, sizeof(struct ovl_layer), GFP_KERNEL);
+ if (!layers)
+ goto out_err;
+
+ ofs->layers = layers;
+ /* Layer 0 is reserved for upper even if there's no upper */
+ ofs->numlayer = 1;
+
sb->s_stack_depth = 0;
sb->s_maxbytes = MAX_LFS_FILESIZE;
atomic_long_set(&ofs->last_ino, 1);
goto out_err;
}
- err = ovl_get_upper(sb, ofs, &upperpath);
+ err = ovl_get_upper(sb, ofs, &layers[0], &upperpath);
if (err)
goto out_err;
sb->s_time_gran = ovl_upper_mnt(ofs)->mnt_sb->s_time_gran;
}
- oe = ovl_get_lowerstack(sb, ofs);
+ oe = ovl_get_lowerstack(sb, splitlower, numlower, ofs, layers);
err = PTR_ERR(oe);
if (IS_ERR(oe))
goto out_err;
goto out_free_oe;
mntput(upperpath.mnt);
+ kfree(splitlower);
sb->s_root = root_dentry;
ovl_entry_stack_free(oe);
kfree(oe);
out_err:
+ kfree(splitlower);
path_put(&upperpath);
ovl_free_fs(ofs);
out:
projects / linux-2.6-microblaze.git / blobdiff