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ceph: request xattrs if xattr_version is zero

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Following sequence of events can happen.
  - Client releases an inode, queues cap release message.
  - A 'lookup' reply brings the same inode back, but the reply
    doesn't contain xattrs because MDS didn't receive the cap release
    message and thought client already has up-to-data xattrs.

The fix is force sending a getattr request to MDS if xattrs_version
is 0. The getattr mask is set to CEPH_STAT_CAP_XATTR, so MDS knows client
does not have xattr.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2014-09-16 21:46:17 +08:00
committed by Ilya Dryomov
parent b76f82398c
commit 508b32d866
5 changed files with 20 additions and 30 deletions
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10
fs/ceph/inode.c
View File

@@ -766,7 +766,7 @@ static int fill_inode(struct inode *inode,
/* xattrs */
/* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */
if ((issued & CEPH_CAP_XATTR_EXCL) == 0 &&
if ((ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL)) &&
le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) {
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
@@ -1907,7 +1907,7 @@ out_put:
* 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, int mask)
int ceph_do_getattr(struct inode *inode, int mask, bool force)
{
struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb);
struct ceph_mds_client *mdsc = fsc->mdsc;
@@ -1920,7 +1920,7 @@ int ceph_do_getattr(struct inode *inode, int mask)
}
dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode);
if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
if (!force && ceph_caps_issued_mask(ceph_inode(inode), mask, 1))
return 0;
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS);
@@ -1948,7 +1948,7 @@ int ceph_permission(struct inode *inode, int mask)
if (mask & MAY_NOT_BLOCK)
return -ECHILD;
err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED);
err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED, false);
if (!err)
err = generic_permission(inode, mask);
@@ -1966,7 +1966,7 @@ int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct ceph_inode_info *ci = ceph_inode(inode);
int err;
err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL);
err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL, false);
if (!err) {
generic_fillattr(inode, stat);
stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino);