[PATCH v6 11/15] ceph: pass idmap to ceph_do_getattr

From: Alexander Mikhalitsyn
Date: Fri Jun 09 2023 - 06:10:43 EST

Just pass down the mount's idmapping to *ceph_do_getattr,
everywhere when possible, because we will need it later.

Here we have two cases:
- filemap_fault/read/write/lseek (when idmap is accessible)
- export_ops/list_xattr/get_xattr (when idmap is not accessible)
in this case we pass &nop_mnt_idmap.

So we can meet permission issue when MDS UID/GID-based path
restriction is used.

Cc: Xiubo Li <xiubli@xxxxxxxxxx>
Cc: Jeff Layton <jlayton@xxxxxxxxxx>
Cc: Ilya Dryomov <idryomov@xxxxxxxxx>
Cc: brauner@xxxxxxxxxx
Cc: ceph-devel@xxxxxxxxxxxxxxx
Signed-off-by: Alexander Mikhalitsyn <aleksandr.mikhalitsyn@xxxxxxxxxxxxx>
---
v6:
- fscrypt rebase
---
fs/ceph/addr.c | 3 ++-
fs/ceph/caps.c | 8 +++++---
fs/ceph/export.c | 2 +-
fs/ceph/file.c | 9 ++++++---
fs/ceph/inode.c | 15 +++++++++------
fs/ceph/ioctl.c | 6 ++++--
fs/ceph/quota.c | 2 +-
fs/ceph/super.c | 4 ++--
fs/ceph/super.h | 11 +++++++----
fs/ceph/xattr.c | 6 +++---
10 files changed, 40 insertions(+), 26 deletions(-)

diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index de9b82905f18..0a32475ed034 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -1630,6 +1630,7 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
/* does not support inline data > PAGE_SIZE */
ret = VM_FAULT_SIGBUS;
} else {
+ struct mnt_idmap *idmap = file_mnt_idmap(vma->vm_file);
struct address_space *mapping = inode->i_mapping;
struct page *page;

@@ -1640,7 +1641,7 @@ static vm_fault_t ceph_filemap_fault(struct vm_fault *vmf)
ret = VM_FAULT_OOM;
goto out_inline;
}
- err = __ceph_do_getattr(inode, page,
+ err = __ceph_do_getattr(idmap, inode, page,
CEPH_STAT_CAP_INLINE_DATA, true);
if (err < 0 || off >= i_size_read(inode)) {
unlock_page(page);
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 5498bc36c1e7..b432f29e80dd 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -2958,7 +2958,8 @@ int ceph_try_get_caps(struct inode *inode, int need, int want,
* due to a small max_size, make sure we check_max_size (and possibly
* ask the mds) so we don't get hung up indefinitely.
*/
-int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need,
+int __ceph_get_caps(struct mnt_idmap *idmap, struct inode *inode,
+ struct ceph_file_info *fi, int need,
int want, loff_t endoff, int *got)
{
struct ceph_inode_info *ci = ceph_inode(inode);
@@ -3072,7 +3073,7 @@ int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi, int need,
* getattr request will bring inline data into
* page cache
*/
- ret = __ceph_do_getattr(inode, NULL,
+ ret = __ceph_do_getattr(idmap, inode, NULL,
CEPH_STAT_CAP_INLINE_DATA,
true);
if (ret < 0)
@@ -3089,8 +3090,9 @@ int ceph_get_caps(struct file *filp, int need, int want, loff_t endoff, int *got
{
struct ceph_file_info *fi = filp->private_data;
struct inode *inode = file_inode(filp);
+ struct mnt_idmap *idmap = file_mnt_idmap(filp);

- return __ceph_get_caps(inode, fi, need, want, endoff, got);
+ return __ceph_get_caps(idmap, inode, fi, need, want, endoff, got);
}

/*
diff --git a/fs/ceph/export.c b/fs/ceph/export.c
index 8559990a59a5..4b422070ca2b 100644
--- a/fs/ceph/export.c
+++ b/fs/ceph/export.c
@@ -188,7 +188,7 @@ static struct dentry *__fh_to_dentry(struct super_block *sb, u64 ino)
if (IS_ERR(inode))
return ERR_CAST(inode);
/* We need LINK caps to reliably check i_nlink */
- err = ceph_do_getattr(inode, CEPH_CAP_LINK_SHARED, false);
+ err = ceph_do_getattr(&nop_mnt_idmap, inode, CEPH_CAP_LINK_SHARED, false);
if (err) {
iput(inode);
return ERR_PTR(err);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index 7be172f29c0b..c2bb8f5fd345 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -2009,6 +2009,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
size_t len = iov_iter_count(to);
struct inode *inode = file_inode(filp);
struct ceph_inode_info *ci = ceph_inode(inode);
+ struct mnt_idmap *idmap = file_mnt_idmap(filp);
bool direct_lock = iocb->ki_flags & IOCB_DIRECT;
ssize_t ret;
int want = 0, got = 0;
@@ -2091,7 +2092,7 @@ static ssize_t ceph_read_iter(struct kiocb *iocb, struct iov_iter *to)
return -ENOMEM;
}

- statret = __ceph_do_getattr(inode, page,
+ statret = __ceph_do_getattr(idmap, inode, page,
CEPH_STAT_CAP_INLINE_DATA, !!page);
if (statret < 0) {
if (page)
@@ -2166,6 +2167,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
struct inode *inode = file_inode(file);
struct ceph_inode_info *ci = ceph_inode(inode);
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
+ struct mnt_idmap *idmap = file_mnt_idmap(file);
struct ceph_osd_client *osdc = &fsc->client->osdc;
struct ceph_cap_flush *prealloc_cf;
ssize_t count, written = 0;
@@ -2199,7 +2201,7 @@ static ssize_t ceph_write_iter(struct kiocb *iocb, struct iov_iter *from)
current->backing_dev_info = inode_to_bdi(inode);

if (iocb->ki_flags & IOCB_APPEND) {
- err = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
+ err = ceph_do_getattr(idmap, inode, CEPH_STAT_CAP_SIZE, false);
if (err < 0)
goto out;
}
@@ -2355,9 +2357,10 @@ static loff_t ceph_llseek(struct file *file, loff_t offset, int whence)
{
if (whence == SEEK_END || whence == SEEK_DATA || whence == SEEK_HOLE) {
struct inode *inode = file_inode(file);
+ struct mnt_idmap *idmap = file_mnt_idmap(file);
int ret;

- ret = ceph_do_getattr(inode, CEPH_STAT_CAP_SIZE, false);
+ ret = ceph_do_getattr(idmap, inode, CEPH_STAT_CAP_SIZE, false);
if (ret < 0)
return ret;
}
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 6a8aeb4b8fb8..49ca13c5b9d8 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -2292,7 +2292,8 @@ static const struct inode_operations ceph_encrypted_symlink_iops = {
* We don't support a PAGE_SIZE that is smaller than the
* CEPH_FSCRYPT_BLOCK_SIZE.
*/
-static int fill_fscrypt_truncate(struct inode *inode,
+static int fill_fscrypt_truncate(struct mnt_idmap *idmap,
+ struct inode *inode,
struct ceph_mds_request *req,
struct iattr *attr)
{
@@ -2311,7 +2312,7 @@ static int fill_fscrypt_truncate(struct inode *inode,
int got, ret, issued;
u64 objver;

- ret = __ceph_get_caps(inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
+ ret = __ceph_get_caps(idmap, inode, NULL, CEPH_CAP_FILE_RD, 0, -1, &got);
if (ret < 0)
return ret;

@@ -2706,7 +2707,7 @@ int __ceph_setattr(struct mnt_idmap *idmap, struct inode *inode,
req->r_num_caps = 1;
req->r_stamp = attr->ia_ctime;
if (fill_fscrypt) {
- err = fill_fscrypt_truncate(inode, req, attr);
+ err = fill_fscrypt_truncate(idmap, inode, req, attr);
if (err)
goto out;
}
@@ -2814,7 +2815,8 @@ int ceph_try_to_choose_auth_mds(struct inode *inode, int mask)
* Verify that we have a lease on the given mask. If not,
* do a getattr against an mds.
*/
-int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
+int __ceph_do_getattr(struct mnt_idmap *idmap, struct inode *inode,
+ struct page *locked_page,
int mask, bool force)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
@@ -2839,6 +2841,7 @@ int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
return PTR_ERR(req);
req->r_inode = inode;
ihold(inode);
+ req->r_mnt_idmap = mnt_idmap_get(idmap);
req->r_num_caps = 1;
req->r_args.getattr.mask = cpu_to_le32(mask);
req->r_locked_page = locked_page;
@@ -2925,7 +2928,7 @@ int ceph_permission(struct mnt_idmap *idmap, struct inode *inode,
if (mask & MAY_NOT_BLOCK)
return -ECHILD;

- err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
+ err = ceph_do_getattr(idmap, inode, CEPH_CAP_AUTH_SHARED, false);

if (!err)
err = generic_permission(idmap, inode, mask);
@@ -2978,7 +2981,7 @@ int ceph_getattr(struct mnt_idmap *idmap, const struct path *path,

/* Skip the getattr altogether if we're asked not to sync */
if ((flags & AT_STATX_SYNC_TYPE) != AT_STATX_DONT_SYNC) {
- err = ceph_do_getattr(inode,
+ err = ceph_do_getattr(idmap, inode,
statx_to_caps(request_mask, inode->i_mode),
flags & AT_STATX_FORCE_SYNC);
if (err)
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index 679402bd80ba..6fa021b973e5 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -18,10 +18,11 @@
static long ceph_ioctl_get_layout(struct file *file, void __user *arg)
{
struct ceph_inode_info *ci = ceph_inode(file_inode(file));
+ struct mnt_idmap *idmap = file_mnt_idmap(file);
struct ceph_ioctl_layout l;
int err;

- err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
+ err = ceph_do_getattr(idmap, file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
if (!err) {
l.stripe_unit = ci->i_layout.stripe_unit;
l.stripe_count = ci->i_layout.stripe_count;
@@ -65,6 +66,7 @@ static long __validate_layout(struct ceph_mds_client *mdsc,
static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
{
struct inode *inode = file_inode(file);
+ struct mnt_idmap *idmap = file_mnt_idmap(file);
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
struct ceph_mds_request *req;
struct ceph_ioctl_layout l;
@@ -76,7 +78,7 @@ static long ceph_ioctl_set_layout(struct file *file, void __user *arg)
return -EFAULT;

/* validate changed params against current layout */
- err = ceph_do_getattr(file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
+ err = ceph_do_getattr(idmap, file_inode(file), CEPH_STAT_CAP_LAYOUT, false);
if (err)
return err;

diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
index f7fcf7f08ec6..515423b3ddea 100644
--- a/fs/ceph/quota.c
+++ b/fs/ceph/quota.c
@@ -150,7 +150,7 @@ static struct inode *lookup_quotarealm_inode(struct ceph_mds_client *mdsc,
}
if (qri->inode) {
/* get caps */
- int ret = __ceph_do_getattr(qri->inode, NULL,
+ int ret = __ceph_do_getattr(&nop_mnt_idmap, qri->inode, NULL,
CEPH_STAT_CAP_INODE, true);
if (ret >= 0)
in = qri->inode;
diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 070b3150d267..3d6d0010d638 100644
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -1607,8 +1607,8 @@ int ceph_force_reconnect(struct super_block *sb)
fsc->mount_state = CEPH_MOUNT_MOUNTED;

if (sb->s_root) {
- err = __ceph_do_getattr(d_inode(sb->s_root), NULL,
- CEPH_STAT_CAP_INODE, true);
+ err = __ceph_do_getattr(&nop_mnt_idmap, d_inode(sb->s_root),
+ NULL, CEPH_STAT_CAP_INODE, true);
}
return err;
}
diff --git a/fs/ceph/super.h b/fs/ceph/super.h
index 8516ac571da9..57cbb69a17c8 100644
--- a/fs/ceph/super.h
+++ b/fs/ceph/super.h
@@ -1082,11 +1082,13 @@ static inline void ceph_queue_flush_snaps(struct inode *inode)
}

extern int ceph_try_to_choose_auth_mds(struct inode *inode, int mask);
-extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page,
+extern int __ceph_do_getattr(struct mnt_idmap *idmap, struct inode *inode,
+ struct page *locked_page,
int mask, bool force);
-static inline int ceph_do_getattr(struct inode *inode, int mask, bool force)
+static inline int ceph_do_getattr(struct mnt_idmap *idmap, struct inode *inode,
+ int mask, bool force)
{
- return __ceph_do_getattr(inode, NULL, mask, force);
+ return __ceph_do_getattr(idmap, inode, NULL, mask, force);
}
extern int ceph_permission(struct mnt_idmap *idmap,
struct inode *inode, int mask);
@@ -1271,7 +1273,8 @@ extern int ceph_encode_dentry_release(void **p, struct dentry *dn,
struct inode *dir,
int mds, int drop, int unless);

-extern int __ceph_get_caps(struct inode *inode, struct ceph_file_info *fi,
+extern int __ceph_get_caps(struct mnt_idmap *idmap, struct inode *inode,
+ struct ceph_file_info *fi,
int need, int want, loff_t endoff, int *got);
extern int ceph_get_caps(struct file *filp, int need, int want,
loff_t endoff, int *got);
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index 76680e5c2f82..d11295e0a115 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -978,7 +978,7 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
mask |= CEPH_STAT_RSTAT;
if (vxattr->flags & VXATTR_FLAG_DIRSTAT)
mask |= CEPH_CAP_FILE_SHARED;
- err = ceph_do_getattr(inode, mask, true);
+ err = ceph_do_getattr(&nop_mnt_idmap, inode, mask, true);
if (err)
return err;
err = -ENODATA;
@@ -1015,7 +1015,7 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
}

/* get xattrs from mds (if we don't already have them) */
- err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
+ err = ceph_do_getattr(&nop_mnt_idmap, inode, CEPH_STAT_CAP_XATTR, true);
if (err)
return err;
spin_lock(&ci->i_ceph_lock);
@@ -1064,7 +1064,7 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
if (ci->i_xattrs.version == 0 ||
!__ceph_caps_issued_mask_metric(ci, CEPH_CAP_XATTR_SHARED, 1)) {
spin_unlock(&ci->i_ceph_lock);
- err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
+ err = ceph_do_getattr(&nop_mnt_idmap, inode, CEPH_STAT_CAP_XATTR, true);
if (err)
return err;
spin_lock(&ci->i_ceph_lock);
--
2.34.1