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-rw-r--r--fs/overlayfs/Kconfig1
-rw-r--r--fs/overlayfs/copy_up.c51
-rw-r--r--fs/overlayfs/dir.c4
-rw-r--r--fs/overlayfs/export.c27
-rw-r--r--fs/overlayfs/file.c247
-rw-r--r--fs/overlayfs/namei.c4
-rw-r--r--fs/overlayfs/overlayfs.h8
-rw-r--r--fs/overlayfs/ovl_entry.h5
-rw-r--r--fs/overlayfs/params.c2
-rw-r--r--fs/overlayfs/readdir.c2
-rw-r--r--fs/overlayfs/super.c37
-rw-r--r--fs/overlayfs/util.c9
12 files changed, 114 insertions, 283 deletions
diff --git a/fs/overlayfs/Kconfig b/fs/overlayfs/Kconfig
index fec5020c34..2ac67e04a6 100644
--- a/fs/overlayfs/Kconfig
+++ b/fs/overlayfs/Kconfig
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0-only
config OVERLAY_FS
tristate "Overlay filesystem support"
+ select FS_STACK
select EXPORTFS
help
An overlay filesystem combines two filesystems - an 'upper' filesystem
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 8bea66c973..0762575a1e 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -230,6 +230,19 @@ static int ovl_copy_fileattr(struct inode *inode, const struct path *old,
return ovl_real_fileattr_set(new, &newfa);
}
+static int ovl_verify_area(loff_t pos, loff_t pos2, loff_t len, loff_t totlen)
+{
+ loff_t tmp;
+
+ if (pos != pos2)
+ return -EIO;
+ if (pos < 0 || len < 0 || totlen < 0)
+ return -EIO;
+ if (check_add_overflow(pos, len, &tmp))
+ return -EIO;
+ return 0;
+}
+
static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
struct file *new_file, loff_t len)
{
@@ -244,7 +257,8 @@ static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
int error = 0;
ovl_path_lowerdata(dentry, &datapath);
- if (WARN_ON(datapath.dentry == NULL))
+ if (WARN_ON_ONCE(datapath.dentry == NULL) ||
+ WARN_ON_ONCE(len < 0))
return -EIO;
old_file = ovl_path_open(&datapath, O_LARGEFILE | O_RDONLY);
@@ -252,12 +266,16 @@ static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
return PTR_ERR(old_file);
/* Try to use clone_file_range to clone up within the same fs */
- ovl_start_write(dentry);
- cloned = do_clone_file_range(old_file, 0, new_file, 0, len, 0);
- ovl_end_write(dentry);
+ cloned = vfs_clone_file_range(old_file, 0, new_file, 0, len, 0);
if (cloned == len)
goto out_fput;
+
/* Couldn't clone, so now we try to copy the data */
+ error = rw_verify_area(READ, old_file, &old_pos, len);
+ if (!error)
+ error = rw_verify_area(WRITE, new_file, &new_pos, len);
+ if (error)
+ goto out_fput;
/* Check if lower fs supports seek operation */
if (old_file->f_mode & FMODE_LSEEK)
@@ -265,7 +283,7 @@ static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
while (len) {
size_t this_len = OVL_COPY_UP_CHUNK_SIZE;
- long bytes;
+ ssize_t bytes;
if (len < this_len)
this_len = len;
@@ -309,11 +327,13 @@ static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
}
}
- ovl_start_write(dentry);
+ error = ovl_verify_area(old_pos, new_pos, this_len, len);
+ if (error)
+ break;
+
bytes = do_splice_direct(old_file, &old_pos,
new_file, &new_pos,
this_len, SPLICE_F_MOVE);
- ovl_end_write(dentry);
if (bytes <= 0) {
error = bytes;
break;
@@ -722,7 +742,7 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
struct inode *inode;
struct inode *udir = d_inode(c->destdir), *wdir = d_inode(c->workdir);
struct path path = { .mnt = ovl_upper_mnt(ofs) };
- struct dentry *temp, *upper;
+ struct dentry *temp, *upper, *trap;
struct ovl_cu_creds cc;
int err;
struct ovl_cattr cattr = {
@@ -759,11 +779,13 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
* temp wasn't moved before copy up completion or cleanup.
*/
ovl_start_write(c->dentry);
- if (lock_rename(c->workdir, c->destdir) != NULL ||
- temp->d_parent != c->workdir) {
+ trap = lock_rename(c->workdir, c->destdir);
+ if (trap || temp->d_parent != c->workdir) {
/* temp or workdir moved underneath us? abort without cleanup */
dput(temp);
err = -EIO;
+ if (IS_ERR(trap))
+ goto out;
goto unlock;
} else if (err) {
goto cleanup;
@@ -804,6 +826,7 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
ovl_set_flag(OVL_WHITEOUTS, inode);
unlock:
unlock_rename(c->workdir, c->destdir);
+out:
ovl_end_write(c->dentry);
return err;
@@ -931,6 +954,13 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
goto out_free_fh;
} else {
/*
+ * c->dentry->d_name is stabilzed by ovl_copy_up_start(),
+ * because if we got here, it means that c->dentry has no upper
+ * alias and changing ->d_name means going through ovl_rename()
+ * that will call ovl_copy_up() on source and target dentry.
+ */
+ c->destname = c->dentry->d_name;
+ /*
* Mark parent "impure" because it may now contain non-pure
* upper
*/
@@ -1110,7 +1140,6 @@ static int ovl_copy_up_one(struct dentry *parent, struct dentry *dentry,
if (parent) {
ovl_path_upper(parent, &parentpath);
ctx.destdir = parentpath.dentry;
- ctx.destname = dentry->d_name;
err = vfs_getattr(&parentpath, &ctx.pstat,
STATX_ATIME | STATX_MTIME,
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index aab3f5d935..0f8b4a7192 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -1180,6 +1180,10 @@ static int ovl_rename(struct mnt_idmap *idmap, struct inode *olddir,
}
trap = lock_rename(new_upperdir, old_upperdir);
+ if (IS_ERR(trap)) {
+ err = PTR_ERR(trap);
+ goto out_revert_creds;
+ }
olddentry = ovl_lookup_upper(ofs, old->d_name.name, old_upperdir,
old->d_name.len);
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
index 7e16bbcad9..063409069f 100644
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -289,7 +289,6 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb,
{
struct dentry *lower = lowerpath ? lowerpath->dentry : NULL;
struct dentry *upper = upper_alias ?: index;
- struct dentry *dentry;
struct inode *inode = NULL;
struct ovl_entry *oe;
struct ovl_inode_params oip = {
@@ -320,27 +319,7 @@ static struct dentry *ovl_obtain_alias(struct super_block *sb,
if (upper)
ovl_set_flag(OVL_UPPERDATA, inode);
- dentry = d_find_any_alias(inode);
- if (dentry)
- goto out_iput;
-
- dentry = d_alloc_anon(inode->i_sb);
- if (unlikely(!dentry))
- goto nomem;
-
- if (upper_alias)
- ovl_dentry_set_upper_alias(dentry);
-
- ovl_dentry_init_reval(dentry, upper, OVL_I_E(inode));
-
- return d_instantiate_anon(dentry, inode);
-
-nomem:
- dput(dentry);
- dentry = ERR_PTR(-ENOMEM);
-out_iput:
- iput(inode);
- return dentry;
+ return d_obtain_alias(inode);
}
/* Get the upper or lower dentry in stack whose on layer @idx */
@@ -460,7 +439,7 @@ static struct dentry *ovl_lookup_real_inode(struct super_block *sb,
* For decoded lower dir file handle, lookup index by origin to check
* if lower dir was copied up and and/or removed.
*/
- if (!this && layer->idx && ofs->indexdir && !WARN_ON(!d_is_dir(real))) {
+ if (!this && layer->idx && ovl_indexdir(sb) && !WARN_ON(!d_is_dir(real))) {
index = ovl_lookup_index(ofs, NULL, real, false);
if (IS_ERR(index))
return index;
@@ -733,7 +712,7 @@ static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,
}
/* Then lookup indexed upper/whiteout by origin fh */
- if (ofs->indexdir) {
+ if (ovl_indexdir(sb)) {
index = ovl_get_index_fh(ofs, fh);
err = PTR_ERR(index);
if (IS_ERR(index)) {
diff --git a/fs/overlayfs/file.c b/fs/overlayfs/file.c
index 131621daeb..05536964d3 100644
--- a/fs/overlayfs/file.c
+++ b/fs/overlayfs/file.c
@@ -9,25 +9,11 @@
#include <linux/xattr.h>
#include <linux/uio.h>
#include <linux/uaccess.h>
-#include <linux/splice.h>
#include <linux/security.h>
-#include <linux/mm.h>
#include <linux/fs.h>
+#include <linux/backing-file.h>
#include "overlayfs.h"
-#include "../internal.h" /* for sb_init_dio_done_wq */
-
-struct ovl_aio_req {
- struct kiocb iocb;
- refcount_t ref;
- struct kiocb *orig_iocb;
- /* used for aio completion */
- struct work_struct work;
- long res;
-};
-
-static struct kmem_cache *ovl_aio_request_cachep;
-
static char ovl_whatisit(struct inode *inode, struct inode *realinode)
{
if (realinode != ovl_inode_upper(inode))
@@ -274,83 +260,16 @@ static void ovl_file_accessed(struct file *file)
touch_atime(&file->f_path);
}
-#define OVL_IOCB_MASK \
- (IOCB_NOWAIT | IOCB_HIPRI | IOCB_DSYNC | IOCB_SYNC | IOCB_APPEND)
-
-static rwf_t iocb_to_rw_flags(int flags)
-{
- return (__force rwf_t)(flags & OVL_IOCB_MASK);
-}
-
-static inline void ovl_aio_put(struct ovl_aio_req *aio_req)
-{
- if (refcount_dec_and_test(&aio_req->ref)) {
- fput(aio_req->iocb.ki_filp);
- kmem_cache_free(ovl_aio_request_cachep, aio_req);
- }
-}
-
-static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req)
-{
- struct kiocb *iocb = &aio_req->iocb;
- struct kiocb *orig_iocb = aio_req->orig_iocb;
-
- if (iocb->ki_flags & IOCB_WRITE) {
- kiocb_end_write(iocb);
- ovl_file_modified(orig_iocb->ki_filp);
- }
-
- orig_iocb->ki_pos = iocb->ki_pos;
- ovl_aio_put(aio_req);
-}
-
-static void ovl_aio_rw_complete(struct kiocb *iocb, long res)
-{
- struct ovl_aio_req *aio_req = container_of(iocb,
- struct ovl_aio_req, iocb);
- struct kiocb *orig_iocb = aio_req->orig_iocb;
-
- ovl_aio_cleanup_handler(aio_req);
- orig_iocb->ki_complete(orig_iocb, res);
-}
-
-static void ovl_aio_complete_work(struct work_struct *work)
-{
- struct ovl_aio_req *aio_req = container_of(work,
- struct ovl_aio_req, work);
-
- ovl_aio_rw_complete(&aio_req->iocb, aio_req->res);
-}
-
-static void ovl_aio_queue_completion(struct kiocb *iocb, long res)
-{
- struct ovl_aio_req *aio_req = container_of(iocb,
- struct ovl_aio_req, iocb);
- struct kiocb *orig_iocb = aio_req->orig_iocb;
-
- /*
- * Punt to a work queue to serialize updates of mtime/size.
- */
- aio_req->res = res;
- INIT_WORK(&aio_req->work, ovl_aio_complete_work);
- queue_work(file_inode(orig_iocb->ki_filp)->i_sb->s_dio_done_wq,
- &aio_req->work);
-}
-
-static int ovl_init_aio_done_wq(struct super_block *sb)
-{
- if (sb->s_dio_done_wq)
- return 0;
-
- return sb_init_dio_done_wq(sb);
-}
-
static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct fd real;
- const struct cred *old_cred;
ssize_t ret;
+ struct backing_file_ctx ctx = {
+ .cred = ovl_creds(file_inode(file)->i_sb),
+ .user_file = file,
+ .accessed = ovl_file_accessed,
+ };
if (!iov_iter_count(iter))
return 0;
@@ -359,37 +278,8 @@ static ssize_t ovl_read_iter(struct kiocb *iocb, struct iov_iter *iter)
if (ret)
return ret;
- ret = -EINVAL;
- if (iocb->ki_flags & IOCB_DIRECT &&
- !(real.file->f_mode & FMODE_CAN_ODIRECT))
- goto out_fdput;
-
- old_cred = ovl_override_creds(file_inode(file)->i_sb);
- if (is_sync_kiocb(iocb)) {
- rwf_t rwf = iocb_to_rw_flags(iocb->ki_flags);
-
- ret = vfs_iter_read(real.file, iter, &iocb->ki_pos, rwf);
- } else {
- struct ovl_aio_req *aio_req;
-
- ret = -ENOMEM;
- aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL);
- if (!aio_req)
- goto out;
-
- aio_req->orig_iocb = iocb;
- kiocb_clone(&aio_req->iocb, iocb, get_file(real.file));
- aio_req->iocb.ki_complete = ovl_aio_rw_complete;
- refcount_set(&aio_req->ref, 2);
- ret = vfs_iocb_iter_read(real.file, &aio_req->iocb, iter);
- ovl_aio_put(aio_req);
- if (ret != -EIOCBQUEUED)
- ovl_aio_cleanup_handler(aio_req);
- }
-out:
- revert_creds(old_cred);
- ovl_file_accessed(file);
-out_fdput:
+ ret = backing_file_read_iter(real.file, iter, iocb, iocb->ki_flags,
+ &ctx);
fdput(real);
return ret;
@@ -400,9 +290,13 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct fd real;
- const struct cred *old_cred;
ssize_t ret;
int ifl = iocb->ki_flags;
+ struct backing_file_ctx ctx = {
+ .cred = ovl_creds(inode->i_sb),
+ .user_file = file,
+ .end_write = ovl_file_modified,
+ };
if (!iov_iter_count(iter))
return 0;
@@ -410,19 +304,11 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
inode_lock(inode);
/* Update mode */
ovl_copyattr(inode);
- ret = file_remove_privs(file);
- if (ret)
- goto out_unlock;
ret = ovl_real_fdget(file, &real);
if (ret)
goto out_unlock;
- ret = -EINVAL;
- if (iocb->ki_flags & IOCB_DIRECT &&
- !(real.file->f_mode & FMODE_CAN_ODIRECT))
- goto out_fdput;
-
if (!ovl_should_sync(OVL_FS(inode->i_sb)))
ifl &= ~(IOCB_DSYNC | IOCB_SYNC);
@@ -431,42 +317,7 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
* this property in case it is set by the issuer.
*/
ifl &= ~IOCB_DIO_CALLER_COMP;
-
- old_cred = ovl_override_creds(file_inode(file)->i_sb);
- if (is_sync_kiocb(iocb)) {
- rwf_t rwf = iocb_to_rw_flags(ifl);
-
- file_start_write(real.file);
- ret = vfs_iter_write(real.file, iter, &iocb->ki_pos, rwf);
- file_end_write(real.file);
- /* Update size */
- ovl_file_modified(file);
- } else {
- struct ovl_aio_req *aio_req;
-
- ret = ovl_init_aio_done_wq(inode->i_sb);
- if (ret)
- goto out;
-
- ret = -ENOMEM;
- aio_req = kmem_cache_zalloc(ovl_aio_request_cachep, GFP_KERNEL);
- if (!aio_req)
- goto out;
-
- aio_req->orig_iocb = iocb;
- kiocb_clone(&aio_req->iocb, iocb, get_file(real.file));
- aio_req->iocb.ki_flags = ifl;
- aio_req->iocb.ki_complete = ovl_aio_queue_completion;
- refcount_set(&aio_req->ref, 2);
- kiocb_start_write(&aio_req->iocb);
- ret = vfs_iocb_iter_write(real.file, &aio_req->iocb, iter);
- ovl_aio_put(aio_req);
- if (ret != -EIOCBQUEUED)
- ovl_aio_cleanup_handler(aio_req);
- }
-out:
- revert_creds(old_cred);
-out_fdput:
+ ret = backing_file_write_iter(real.file, iter, iocb, ifl, &ctx);
fdput(real);
out_unlock:
@@ -479,20 +330,21 @@ static ssize_t ovl_splice_read(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
- const struct cred *old_cred;
struct fd real;
ssize_t ret;
+ struct backing_file_ctx ctx = {
+ .cred = ovl_creds(file_inode(in)->i_sb),
+ .user_file = in,
+ .accessed = ovl_file_accessed,
+ };
ret = ovl_real_fdget(in, &real);
if (ret)
return ret;
- old_cred = ovl_override_creds(file_inode(in)->i_sb);
- ret = vfs_splice_read(real.file, ppos, pipe, len, flags);
- revert_creds(old_cred);
- ovl_file_accessed(in);
-
+ ret = backing_file_splice_read(real.file, ppos, pipe, len, flags, &ctx);
fdput(real);
+
return ret;
}
@@ -508,30 +360,23 @@ static ssize_t ovl_splice_write(struct pipe_inode_info *pipe, struct file *out,
loff_t *ppos, size_t len, unsigned int flags)
{
struct fd real;
- const struct cred *old_cred;
struct inode *inode = file_inode(out);
ssize_t ret;
+ struct backing_file_ctx ctx = {
+ .cred = ovl_creds(inode->i_sb),
+ .user_file = out,
+ .end_write = ovl_file_modified,
+ };
inode_lock(inode);
/* Update mode */
ovl_copyattr(inode);
- ret = file_remove_privs(out);
- if (ret)
- goto out_unlock;
ret = ovl_real_fdget(out, &real);
if (ret)
goto out_unlock;
- old_cred = ovl_override_creds(inode->i_sb);
- file_start_write(real.file);
-
- ret = iter_file_splice_write(pipe, real.file, ppos, len, flags);
-
- file_end_write(real.file);
- /* Update size */
- ovl_file_modified(out);
- revert_creds(old_cred);
+ ret = backing_file_splice_write(pipe, real.file, ppos, len, flags, &ctx);
fdput(real);
out_unlock:
@@ -569,23 +414,13 @@ static int ovl_fsync(struct file *file, loff_t start, loff_t end, int datasync)
static int ovl_mmap(struct file *file, struct vm_area_struct *vma)
{
struct file *realfile = file->private_data;
- const struct cred *old_cred;
- int ret;
-
- if (!realfile->f_op->mmap)
- return -ENODEV;
+ struct backing_file_ctx ctx = {
+ .cred = ovl_creds(file_inode(file)->i_sb),
+ .user_file = file,
+ .accessed = ovl_file_accessed,
+ };
- if (WARN_ON(file != vma->vm_file))
- return -EIO;
-
- vma_set_file(vma, realfile);
-
- old_cred = ovl_override_creds(file_inode(file)->i_sb);
- ret = call_mmap(vma->vm_file, vma);
- revert_creds(old_cred);
- ovl_file_accessed(file);
-
- return ret;
+ return backing_file_mmap(realfile, vma, &ctx);
}
static long ovl_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
@@ -778,19 +613,3 @@ const struct file_operations ovl_file_operations = {
.copy_file_range = ovl_copy_file_range,
.remap_file_range = ovl_remap_file_range,
};
-
-int __init ovl_aio_request_cache_init(void)
-{
- ovl_aio_request_cachep = kmem_cache_create("ovl_aio_req",
- sizeof(struct ovl_aio_req),
- 0, SLAB_HWCACHE_ALIGN, NULL);
- if (!ovl_aio_request_cachep)
- return -ENOMEM;
-
- return 0;
-}
-
-void ovl_aio_request_cache_destroy(void)
-{
- kmem_cache_destroy(ovl_aio_request_cachep);
-}
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index 22c29e540e..5764f91d28 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -759,7 +759,7 @@ struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh)
if (err)
return ERR_PTR(err);
- index = lookup_positive_unlocked(name.name, ofs->indexdir, name.len);
+ index = lookup_positive_unlocked(name.name, ofs->workdir, name.len);
kfree(name.name);
if (IS_ERR(index)) {
if (PTR_ERR(index) == -ENOENT)
@@ -792,7 +792,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
return ERR_PTR(err);
index = lookup_one_positive_unlocked(ovl_upper_mnt_idmap(ofs), name.name,
- ofs->indexdir, name.len);
+ ofs->workdir, name.len);
if (IS_ERR(index)) {
err = PTR_ERR(index);
if (err == -ENOENT) {
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 18132ab04e..ee949f3e7c 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -426,6 +426,12 @@ int ovl_want_write(struct dentry *dentry);
void ovl_drop_write(struct dentry *dentry);
struct dentry *ovl_workdir(struct dentry *dentry);
const struct cred *ovl_override_creds(struct super_block *sb);
+
+static inline const struct cred *ovl_creds(struct super_block *sb)
+{
+ return OVL_FS(sb)->creator_cred;
+}
+
int ovl_can_decode_fh(struct super_block *sb);
struct dentry *ovl_indexdir(struct super_block *sb);
bool ovl_index_all(struct super_block *sb);
@@ -848,8 +854,6 @@ struct dentry *ovl_create_temp(struct ovl_fs *ofs, struct dentry *workdir,
/* file.c */
extern const struct file_operations ovl_file_operations;
-int __init ovl_aio_request_cache_init(void);
-void ovl_aio_request_cache_destroy(void);
int ovl_real_fileattr_get(const struct path *realpath, struct fileattr *fa);
int ovl_real_fileattr_set(const struct path *realpath, struct fileattr *fa);
int ovl_fileattr_get(struct dentry *dentry, struct fileattr *fa);
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index f02c4bf231..cb449ab310 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -65,10 +65,8 @@ struct ovl_fs {
struct ovl_sb *fs;
/* workbasedir is the path at workdir= mount option */
struct dentry *workbasedir;
- /* workdir is the 'work' directory under workbasedir */
+ /* workdir is the 'work' or 'index' directory under workbasedir */
struct dentry *workdir;
- /* index directory listing overlay inodes by origin file handle */
- struct dentry *indexdir;
long namelen;
/* pathnames of lower and upper dirs, for show_options */
struct ovl_config config;
@@ -83,7 +81,6 @@ struct ovl_fs {
/* Traps in ovl inode cache */
struct inode *workbasedir_trap;
struct inode *workdir_trap;
- struct inode *indexdir_trap;
/* -1: disabled, 0: same fs, 1..32: number of unused ino bits */
int xino_mode;
/* For allocation of non-persistent inode numbers */
diff --git a/fs/overlayfs/params.c b/fs/overlayfs/params.c
index 488f920f79..36dcc530ac 100644
--- a/fs/overlayfs/params.c
+++ b/fs/overlayfs/params.c
@@ -751,10 +751,8 @@ void ovl_free_fs(struct ovl_fs *ofs)
unsigned i;
iput(ofs->workbasedir_trap);
- iput(ofs->indexdir_trap);
iput(ofs->workdir_trap);
dput(ofs->whiteout);
- dput(ofs->indexdir);
dput(ofs->workdir);
if (ofs->workdir_locked)
ovl_inuse_unlock(ofs->workbasedir);
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index 8e8545bc27..0ca8af060b 100644
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -1170,7 +1170,7 @@ int ovl_workdir_cleanup(struct ovl_fs *ofs, struct inode *dir,
int ovl_indexdir_cleanup(struct ovl_fs *ofs)
{
int err;
- struct dentry *indexdir = ofs->indexdir;
+ struct dentry *indexdir = ofs->workdir;
struct dentry *index = NULL;
struct inode *dir = indexdir->d_inode;
struct path path = { .mnt = ovl_upper_mnt(ofs), .dentry = indexdir };
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 36543e9ffd..2eef6c70b2 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -439,8 +439,10 @@ static bool ovl_workdir_ok(struct dentry *workdir, struct dentry *upperdir)
bool ok = false;
if (workdir != upperdir) {
- ok = (lock_rename(workdir, upperdir) == NULL);
- unlock_rename(workdir, upperdir);
+ struct dentry *trap = lock_rename(workdir, upperdir);
+ if (!IS_ERR(trap))
+ unlock_rename(workdir, upperdir);
+ ok = (trap == NULL);
}
return ok;
}
@@ -853,10 +855,8 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
if (IS_ERR(indexdir)) {
err = PTR_ERR(indexdir);
} else if (indexdir) {
- ofs->indexdir = indexdir;
- ofs->workdir = dget(indexdir);
-
- err = ovl_setup_trap(sb, ofs->indexdir, &ofs->indexdir_trap,
+ ofs->workdir = indexdir;
+ err = ovl_setup_trap(sb, indexdir, &ofs->workdir_trap,
"indexdir");
if (err)
goto out;
@@ -869,16 +869,15 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
* ".overlay.upper" to indicate that index may have
* directory entries.
*/
- if (ovl_check_origin_xattr(ofs, ofs->indexdir)) {
- err = ovl_verify_origin_xattr(ofs, ofs->indexdir,
+ if (ovl_check_origin_xattr(ofs, indexdir)) {
+ err = ovl_verify_origin_xattr(ofs, indexdir,
OVL_XATTR_ORIGIN,
upperpath->dentry, true,
false);
if (err)
pr_err("failed to verify index dir 'origin' xattr\n");
}
- err = ovl_verify_upper(ofs, ofs->indexdir, upperpath->dentry,
- true);
+ err = ovl_verify_upper(ofs, indexdir, upperpath->dentry, true);
if (err)
pr_err("failed to verify index dir 'upper' xattr\n");
@@ -886,7 +885,7 @@ static int ovl_get_indexdir(struct super_block *sb, struct ovl_fs *ofs,
if (!err)
err = ovl_indexdir_cleanup(ofs);
}
- if (err || !ofs->indexdir)
+ if (err || !indexdir)
pr_warn("try deleting index dir or mounting with '-o index=off' to disable inodes index.\n");
out:
@@ -1421,7 +1420,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
goto out_free_oe;
/* Force r/o mount with no index dir */
- if (!ofs->indexdir)
+ if (!ofs->workdir)
sb->s_flags |= SB_RDONLY;
}
@@ -1430,7 +1429,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
goto out_free_oe;
/* Show index=off in /proc/mounts for forced r/o mount */
- if (!ofs->indexdir) {
+ if (!ofs->workdir) {
ofs->config.index = false;
if (ovl_upper_mnt(ofs) && ofs->config.nfs_export) {
pr_warn("NFS export requires an index dir, falling back to nfs_export=off.\n");
@@ -1469,6 +1468,7 @@ int ovl_fill_super(struct super_block *sb, struct fs_context *fc)
* lead to unexpected results.
*/
sb->s_iflags |= SB_I_NOUMASK;
+ sb->s_iflags |= SB_I_EVM_UNSUPPORTED;
err = -ENOMEM;
root_dentry = ovl_get_root(sb, ctx->upper.dentry, oe);
@@ -1516,14 +1516,10 @@ static int __init ovl_init(void)
if (ovl_inode_cachep == NULL)
return -ENOMEM;
- err = ovl_aio_request_cache_init();
- if (!err) {
- err = register_filesystem(&ovl_fs_type);
- if (!err)
- return 0;
+ err = register_filesystem(&ovl_fs_type);
+ if (!err)
+ return 0;
- ovl_aio_request_cache_destroy();
- }
kmem_cache_destroy(ovl_inode_cachep);
return err;
@@ -1539,7 +1535,6 @@ static void __exit ovl_exit(void)
*/
rcu_barrier();
kmem_cache_destroy(ovl_inode_cachep);
- ovl_aio_request_cache_destroy();
}
module_init(ovl_init);
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index cd0722309e..a8e17f14d7 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -91,7 +91,7 @@ struct dentry *ovl_indexdir(struct super_block *sb)
{
struct ovl_fs *ofs = OVL_FS(sb);
- return ofs->indexdir;
+ return ofs->config.index ? ofs->workdir : NULL;
}
/* Index all files on copy up. For now only enabled for NFS export */
@@ -1207,12 +1207,17 @@ void ovl_nlink_end(struct dentry *dentry)
int ovl_lock_rename_workdir(struct dentry *workdir, struct dentry *upperdir)
{
+ struct dentry *trap;
+
/* Workdir should not be the same as upperdir */
if (workdir == upperdir)
goto err;
/* Workdir should not be subdir of upperdir and vice versa */
- if (lock_rename(workdir, upperdir) != NULL)
+ trap = lock_rename(workdir, upperdir);
+ if (IS_ERR(trap))
+ goto err;
+ if (trap)
goto err_unlock;
return 0;