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authorAmir Goldstein <amir73il@gmail.com>2023-08-16 12:42:18 +0300
committerAmir Goldstein <amir73il@gmail.com>2023-10-31 00:12:57 +0200
commitc63e56a4a6523fcb1358e1878607d77a40b534bb (patch)
tree2c8b9e0f4c23495df940722abfb6eaf1133ad482 /fs/overlayfs
parent162d06444070c12827d604a2cb6b6bd98d48cbb0 (diff)
ovl: do not open/llseek lower file with upper sb_writers held
overlayfs file open (ovl_maybe_lookup_lowerdata) and overlay file llseek take the ovl_inode_lock, without holding upper sb_writers. In case of nested lower overlay that uses same upper fs as this overlay, lockdep will warn about (possibly false positive) circular lock dependency when doing open/llseek of lower ovl file during copy up with our upper sb_writers held, because the locking ordering seems reverse to the locking order in ovl_copy_up_start(): - lower ovl_inode_lock - upper sb_writers Let the copy up "transaction" keeps an elevated mnt write count on upper mnt, but leaves taking upper sb_writers to lower level helpers only when they actually need it. This allows to avoid holding upper sb_writers during lower file open/llseek and prevents the lockdep warning. Minimizing the scope of upper sb_writers during copy up is also needed for fixing another possible deadlocks by a following patch. Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'fs/overlayfs')
-rw-r--r--fs/overlayfs/copy_up.c76
-rw-r--r--fs/overlayfs/util.c8
2 files changed, 61 insertions, 23 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index a999ae207e74..cabf4752dc3d 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -252,7 +252,9 @@ 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);
if (cloned == len)
goto out_fput;
/* Couldn't clone, so now we try to copy the data */
@@ -287,8 +289,12 @@ static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
* it may not recognize all kind of holes and sometimes
* only skips partial of hole area. However, it will be
* enough for most of the use cases.
+ *
+ * We do not hold upper sb_writers throughout the loop to avert
+ * lockdep warning with llseek of lower file in nested overlay:
+ * - upper sb_writers
+ * -- lower ovl_inode_lock (ovl_llseek)
*/
-
if (skip_hole && data_pos < old_pos) {
data_pos = vfs_llseek(old_file, old_pos, SEEK_DATA);
if (data_pos > old_pos) {
@@ -303,9 +309,11 @@ static int ovl_copy_up_file(struct ovl_fs *ofs, struct dentry *dentry,
}
}
+ ovl_start_write(dentry);
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;
@@ -555,14 +563,16 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
struct ovl_fs *ofs = OVL_FS(c->dentry->d_sb);
struct inode *udir = d_inode(upperdir);
+ ovl_start_write(c->dentry);
+
/* Mark parent "impure" because it may now contain non-pure upper */
err = ovl_set_impure(c->parent, upperdir);
if (err)
- return err;
+ goto out;
err = ovl_set_nlink_lower(c->dentry);
if (err)
- return err;
+ goto out;
inode_lock_nested(udir, I_MUTEX_PARENT);
upper = ovl_lookup_upper(ofs, c->dentry->d_name.name, upperdir,
@@ -581,10 +591,12 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
}
inode_unlock(udir);
if (err)
- return err;
+ goto out;
err = ovl_set_nlink_upper(c->dentry);
+out:
+ ovl_end_write(c->dentry);
return err;
}
@@ -719,21 +731,19 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
.link = c->link
};
- /* workdir and destdir could be the same when copying up to indexdir */
- err = -EIO;
- if (lock_rename(c->workdir, c->destdir) != NULL)
- goto unlock;
-
err = ovl_prep_cu_creds(c->dentry, &cc);
if (err)
- goto unlock;
+ return err;
+ ovl_start_write(c->dentry);
+ inode_lock(wdir);
temp = ovl_create_temp(ofs, c->workdir, &cattr);
+ inode_unlock(wdir);
+ ovl_end_write(c->dentry);
ovl_revert_cu_creds(&cc);
- err = PTR_ERR(temp);
if (IS_ERR(temp))
- goto unlock;
+ return PTR_ERR(temp);
/*
* Copy up data first and then xattrs. Writing data after
@@ -741,8 +751,21 @@ static int ovl_copy_up_workdir(struct ovl_copy_up_ctx *c)
*/
path.dentry = temp;
err = ovl_copy_up_data(c, &path);
- if (err)
+ /*
+ * We cannot hold lock_rename() throughout this helper, because or
+ * lock ordering with sb_writers, which shouldn't be held when calling
+ * ovl_copy_up_data(), so lock workdir and destdir and make sure that
+ * temp wasn't moved before copy up completion or cleanup.
+ * If temp was moved, abort without the cleanup.
+ */
+ ovl_start_write(c->dentry);
+ if (lock_rename(c->workdir, c->destdir) != NULL ||
+ temp->d_parent != c->workdir) {
+ err = -EIO;
+ goto unlock;
+ } else if (err) {
goto cleanup;
+ }
err = ovl_copy_up_metadata(c, temp);
if (err)
@@ -779,6 +802,7 @@ 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);
+ ovl_end_write(c->dentry);
return err;
@@ -802,9 +826,10 @@ static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c)
if (err)
return err;
+ ovl_start_write(c->dentry);
tmpfile = ovl_do_tmpfile(ofs, c->workdir, c->stat.mode);
+ ovl_end_write(c->dentry);
ovl_revert_cu_creds(&cc);
-
if (IS_ERR(tmpfile))
return PTR_ERR(tmpfile);
@@ -815,9 +840,11 @@ static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c)
goto out_fput;
}
+ ovl_start_write(c->dentry);
+
err = ovl_copy_up_metadata(c, temp);
if (err)
- goto out_fput;
+ goto out;
inode_lock_nested(udir, I_MUTEX_PARENT);
@@ -831,7 +858,7 @@ static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c)
inode_unlock(udir);
if (err)
- goto out_fput;
+ goto out;
if (c->metacopy_digest)
ovl_set_flag(OVL_HAS_DIGEST, d_inode(c->dentry));
@@ -843,6 +870,8 @@ static int ovl_copy_up_tmpfile(struct ovl_copy_up_ctx *c)
ovl_set_upperdata(d_inode(c->dentry));
ovl_inode_update(d_inode(c->dentry), dget(temp));
+out:
+ ovl_end_write(c->dentry);
out_fput:
fput(tmpfile);
return err;
@@ -893,7 +922,9 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
* Mark parent "impure" because it may now contain non-pure
* upper
*/
+ ovl_start_write(c->dentry);
err = ovl_set_impure(c->parent, c->destdir);
+ ovl_end_write(c->dentry);
if (err)
return err;
}
@@ -909,6 +940,7 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
if (c->indexed)
ovl_set_flag(OVL_INDEX, d_inode(c->dentry));
+ ovl_start_write(c->dentry);
if (to_index) {
/* Initialize nlink for copy up of disconnected dentry */
err = ovl_set_nlink_upper(c->dentry);
@@ -923,6 +955,7 @@ static int ovl_do_copy_up(struct ovl_copy_up_ctx *c)
ovl_dentry_set_upper_alias(c->dentry);
ovl_dentry_update_reval(c->dentry, ovl_dentry_upper(c->dentry));
}
+ ovl_end_write(c->dentry);
out:
if (to_index)
@@ -1011,15 +1044,16 @@ static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c)
* Writing to upper file will clear security.capability xattr. We
* don't want that to happen for normal copy-up operation.
*/
+ ovl_start_write(c->dentry);
if (capability) {
err = ovl_do_setxattr(ofs, upperpath.dentry, XATTR_NAME_CAPS,
capability, cap_size, 0);
- if (err)
- goto out_free;
}
-
-
- err = ovl_removexattr(ofs, upperpath.dentry, OVL_XATTR_METACOPY);
+ if (!err) {
+ err = ovl_removexattr(ofs, upperpath.dentry,
+ OVL_XATTR_METACOPY);
+ }
+ ovl_end_write(c->dentry);
if (err)
goto out_free;
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index af11c83b7a25..12156e2091ad 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -670,6 +670,10 @@ bool ovl_already_copied_up(struct dentry *dentry, int flags)
return false;
}
+/*
+ * The copy up "transaction" keeps an elevated mnt write count on upper mnt,
+ * but leaves taking freeze protection on upper sb to lower level helpers.
+ */
int ovl_copy_up_start(struct dentry *dentry, int flags)
{
struct inode *inode = d_inode(dentry);
@@ -682,7 +686,7 @@ int ovl_copy_up_start(struct dentry *dentry, int flags)
if (ovl_already_copied_up_locked(dentry, flags))
err = 1; /* Already copied up */
else
- err = ovl_want_write(dentry);
+ err = ovl_get_write_access(dentry);
if (err)
goto out_unlock;
@@ -695,7 +699,7 @@ out_unlock:
void ovl_copy_up_end(struct dentry *dentry)
{
- ovl_drop_write(dentry);
+ ovl_put_write_access(dentry);
ovl_inode_unlock(d_inode(dentry));
}