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authorAlex Elder <elder@dreamhost.com>2012-01-12 05:41:01 +0400
committerSage Weil <sage@newdream.net>2012-01-12 23:00:51 +0400
commit83eb26af0db71f2dfe551405c55d982288fa6178 (patch)
treec7bc62a810483e328cbe2b931416e58ec655ab9b /fs/ceph
parent0e805a1d857799352e51e8697c0b1a30aec16913 (diff)
downloadlinux-83eb26af0db71f2dfe551405c55d982288fa6178.tar.xz
ceph: ensure prealloc_blob is in place when removing xattr
In __ceph_build_xattrs_blob(), if a ceph inode's extended attributes are marked dirty, all attributes recorded in its rb_tree index are formatted into a "blob" buffer. The target buffer is recorded in ceph_inode->i_xattrs.prealloc_blob, and it is expected to exist and be of sufficient size to hold the attributes. The extended attributes are marked dirty in two cases: when a new attribute is added to the inode; or when one is removed. In the former case work is done to ensure the prealloc_blob buffer is properly set up, but in the latter it is not. Change the logic in ceph_removexattr() so it matches what is done in ceph_setxattr(). Note that this is done in a way that keeps the two blocks of code nearly identical, in anticipation of a subsequent patch that encapsulates some of this logic into one or more helper routines. Signed-off-by: Alex Elder <elder@dreamhost.com> Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph')
-rw-r--r--fs/ceph/xattr.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c
index a5e36e4488a7..857214ae8c08 100644
--- a/fs/ceph/xattr.c
+++ b/fs/ceph/xattr.c
@@ -818,6 +818,7 @@ int ceph_removexattr(struct dentry *dentry, const char *name)
struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
int issued;
int err;
+ int required_blob_size;
int dirty;
if (ceph_snap(inode) != CEPH_NOSNAP)
@@ -833,14 +834,34 @@ int ceph_removexattr(struct dentry *dentry, const char *name)
return -EOPNOTSUPP;
}
+ err = -ENOMEM;
spin_lock(&ci->i_ceph_lock);
__build_xattrs(inode);
+retry:
issued = __ceph_caps_issued(ci, NULL);
dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
if (!(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
+ required_blob_size = __get_required_blob_size(ci, 0, 0);
+
+ if (!ci->i_xattrs.prealloc_blob ||
+ required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
+ struct ceph_buffer *blob;
+
+ spin_unlock(&ci->i_ceph_lock);
+ dout(" preaallocating new blob size=%d\n", required_blob_size);
+ blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
+ if (!blob)
+ goto out;
+ spin_lock(&ci->i_ceph_lock);
+ if (ci->i_xattrs.prealloc_blob)
+ ceph_buffer_put(ci->i_xattrs.prealloc_blob);
+ ci->i_xattrs.prealloc_blob = blob;
+ goto retry;
+ }
+
err = __remove_xattr_by_name(ceph_inode(inode), name);
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
ci->i_xattrs.dirty = true;
@@ -853,6 +874,7 @@ int ceph_removexattr(struct dentry *dentry, const char *name)
do_sync:
spin_unlock(&ci->i_ceph_lock);
err = ceph_send_removexattr(dentry, name);
+out:
return err;
}