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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
Download Patch File Download Diff File Expand all files Collapse all files

29
fs/ceph/xattr.c
View File

@@ -736,24 +736,20 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
goto get_xattr;
} else {
if (ci->i_xattrs.version == 0 ||
!__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
spin_unlock(&ci->i_ceph_lock);
/* get xattrs from mds (if we don't already have them) */
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
if (err)
return err;
spin_lock(&ci->i_ceph_lock);
}
spin_lock(&ci->i_ceph_lock);
err = __build_xattrs(inode);
if (err < 0)
goto out;
get_xattr:
err = -ENODATA; /* == ENOATTR */
xattr = __get_xattr(ci, name);
if (!xattr)
@@ -798,23 +794,18 @@ ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
ci->i_xattrs.version, ci->i_xattrs.index_version);
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
goto list_xattr;
} else {
if (ci->i_xattrs.version == 0 ||
!__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
spin_unlock(&ci->i_ceph_lock);
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
if (err)
return err;
spin_lock(&ci->i_ceph_lock);
}
spin_lock(&ci->i_ceph_lock);
err = __build_xattrs(inode);
if (err < 0)
goto out;
list_xattr:
/*
* Start with virtual dir xattr names (if any) (including
* terminating '\0' characters for each).
@@ -968,7 +959,7 @@ int __ceph_setxattr(struct dentry *dentry, const char *name,
retry:
issued = __ceph_caps_issued(ci, NULL);
dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
if (!(issued & CEPH_CAP_XATTR_EXCL))
if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
__build_xattrs(inode);
@@ -1077,7 +1068,7 @@ retry:
issued = __ceph_caps_issued(ci, NULL);
dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
if (!(issued & CEPH_CAP_XATTR_EXCL))
if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
__build_xattrs(inode);