Commit d837a49b switches from iop->setxattr from ovl_setxattr to
generic_setxattr, so switch from ovl_removexattr to generic_removexattr
as well. As far as permission checking goes, the same rules should
apply in either case.
While doing that, rename ovl_setxattr to ovl_xattr_set to indicate that
this is not an iop->setxattr implementation and remove the unused inode
argument.
Move ovl_other_xattr_set above ovl_own_xattr_set so that they match the
order of handlers in ovl_xattr_handlers.
Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
fs/overlayfs/dir.c | 2 +-
fs/overlayfs/inode.c | 65 ++++++++++++++++--------------------------------
fs/overlayfs/overlayfs.h | 6 ++---
fs/overlayfs/super.c | 18 +++++++-------
4 files changed, 33 insertions(+), 58 deletions(-)
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 12bcd07..7823480 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -952,7 +952,7 @@ const struct inode_operations ovl_dir_inode_operations = {
.setxattr = generic_setxattr,
.getxattr = ovl_getxattr,
.listxattr = ovl_listxattr,
- .removexattr = ovl_removexattr,
+ .removexattr = generic_removexattr,
.get_acl = ovl_get_acl,
.update_time = ovl_update_time,
};
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 859e42c..4f348ca 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -197,25 +197,38 @@ static bool ovl_is_private_xattr(const char *name)
sizeof(OVL_XATTR_PREFIX) - 1) == 0;
}
-int ovl_setxattr(struct dentry *dentry, struct inode *inode,
- const char *name, const void *value,
- size_t size, int flags)
+int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value,
+ size_t size, int flags)
{
int err;
- struct dentry *upperdentry;
+ struct path realpath;
+ enum ovl_path_type type = ovl_path_real(dentry, &realpath);
const struct cred *old_cred;
err = ovl_want_write(dentry);
if (err)
goto out;
+ if (!value && !OVL_TYPE_UPPER(type)) {
+ err = vfs_getxattr(realpath.dentry, name, NULL, 0);
+ if (err < 0)
+ goto out_drop_write;
+ }
+
err = ovl_copy_up(dentry);
if (err)
goto out_drop_write;
- upperdentry = ovl_dentry_upper(dentry);
+ if (!OVL_TYPE_UPPER(type))
+ ovl_path_upper(dentry, &realpath);
+
old_cred = ovl_override_creds(dentry->d_sb);
- err = vfs_setxattr(upperdentry, name, value, size, flags);
+ if (value)
+ err = vfs_setxattr(realpath.dentry, name, value, size, flags);
+ else {
+ BUG_ON(flags != XATTR_REPLACE);
+ err = vfs_removexattr(realpath.dentry, name);
+ }
revert_creds(old_cred);
out_drop_write:
@@ -271,42 +284,6 @@ ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
return res;
}
-int ovl_removexattr(struct dentry *dentry, const char *name)
-{
- int err;
- struct path realpath;
- enum ovl_path_type type = ovl_path_real(dentry, &realpath);
- const struct cred *old_cred;
-
- err = ovl_want_write(dentry);
- if (err)
- goto out;
-
- err = -ENODATA;
- if (ovl_is_private_xattr(name))
- goto out_drop_write;
-
- if (!OVL_TYPE_UPPER(type)) {
- err = vfs_getxattr(realpath.dentry, name, NULL, 0);
- if (err < 0)
- goto out_drop_write;
-
- err = ovl_copy_up(dentry);
- if (err)
- goto out_drop_write;
-
- ovl_path_upper(dentry, &realpath);
- }
-
- old_cred = ovl_override_creds(dentry->d_sb);
- err = vfs_removexattr(realpath.dentry, name);
- revert_creds(old_cred);
-out_drop_write:
- ovl_drop_write(dentry);
-out:
- return err;
-}
-
struct posix_acl *ovl_get_acl(struct inode *inode, int type)
{
struct inode *realinode = ovl_inode_real(inode, NULL);
@@ -392,7 +369,7 @@ static const struct inode_operations ovl_file_inode_operations = {
.setxattr = generic_setxattr,
.getxattr = ovl_getxattr,
.listxattr = ovl_listxattr,
- .removexattr = ovl_removexattr,
+ .removexattr = generic_removexattr,
.get_acl = ovl_get_acl,
.update_time = ovl_update_time,
};
@@ -405,7 +382,7 @@ static const struct inode_operations ovl_symlink_inode_operations = {
.setxattr = generic_setxattr,
.getxattr = ovl_getxattr,
.listxattr = ovl_listxattr,
- .removexattr = ovl_removexattr,
+ .removexattr = generic_removexattr,
.update_time = ovl_update_time,
};
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index 77fd667..951c8f5 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -183,13 +183,11 @@ int ovl_check_d_type_supported(struct path *realpath);
/* inode.c */
int ovl_setattr(struct dentry *dentry, struct iattr *attr);
int ovl_permission(struct inode *inode, int mask);
-int ovl_setxattr(struct dentry *dentry, struct inode *inode,
- const char *name, const void *value,
- size_t size, int flags);
+int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value,
+ size_t size, int flags);
ssize_t ovl_getxattr(struct dentry *dentry, struct inode *inode,
const char *name, void *value, size_t size);
ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size);
-int ovl_removexattr(struct dentry *dentry, const char *name);
struct posix_acl *ovl_get_acl(struct inode *inode, int type);
int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags);
int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index e2b555d..9eb3f82 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -999,21 +999,13 @@ ovl_posix_acl_xattr_set(const struct xattr_handler *handler,
posix_acl_release(acl);
- return ovl_setxattr(dentry, inode, handler->name, value, size, flags);
+ return ovl_xattr_set(dentry, handler->name, value, size, flags);
out_acl_release:
posix_acl_release(acl);
return err;
}
-static int ovl_other_xattr_set(const struct xattr_handler *handler,
- struct dentry *dentry, struct inode *inode,
- const char *name, const void *value,
- size_t size, int flags)
-{
- return ovl_setxattr(dentry, inode, name, value, size, flags);
-}
-
static int ovl_own_xattr_set(const struct xattr_handler *handler,
struct dentry *dentry, struct inode *inode,
const char *name, const void *value,
@@ -1022,6 +1014,14 @@ static int ovl_own_xattr_set(const struct xattr_handler *handler,
return -EPERM;
}
+static int ovl_other_xattr_set(const struct xattr_handler *handler,
+ struct dentry *dentry, struct inode *inode,
+ const char *name, const void *value,
+ size_t size, int flags)
+{
+ return ovl_xattr_set(dentry, name, value, size, flags);
+}
+
static const struct xattr_handler __maybe_unused
ovl_posix_acl_access_xattr_handler = {
.name = XATTR_NAME_POSIX_ACL_ACCESS,
--
2.7.4
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