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ceph: trim deleted inode

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The MDS uses caps message to notify clients about deleted inode.
when receiving a such message, invalidate any alias of the inode.
This makes the kernel release the inode ASAP.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>
Reviewed-by: Sage Weil <sage@inktank.com>
This commit is contained in:
Yan, Zheng 2013-07-21 10:07:51 +08:00 committed by Sage Weil
parent 85ce127a9a
commit ca20c99191
1 changed files with 40 additions and 1 deletions
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41
fs/ceph/caps.c
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@ -2333,6 +2333,38 @@ void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr,
iput(inode);
}
/*
* Invalidate unlinked inode's aliases, so we can drop the inode ASAP.
*/
static void invalidate_aliases(struct inode *inode)
{
struct dentry *dn, *prev = NULL;
dout("invalidate_aliases inode %p\n", inode);
d_prune_aliases(inode);
/*
* For non-directory inode, d_find_alias() only returns
* connected dentry. After calling d_delete(), the dentry
* become disconnected.
*
* For directory inode, d_find_alias() only can return
* disconnected dentry. But directory inode should have
* one alias at most.
*/
while ((dn = d_find_alias(inode))) {
if (dn == prev) {
dput(dn);
break;
}
d_delete(dn);
if (prev)
dput(prev);
prev = dn;
}
if (prev)
dput(prev);
}
/*
* Handle a cap GRANT message from the MDS. (Note that a GRANT may
* actually be a revocation if it specifies a smaller cap set.)
@ -2363,6 +2395,7 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
int writeback = 0;
int revoked_rdcache = 0;
int queue_invalidate = 0;
int deleted_inode = 0;
dout("handle_cap_grant inode %p cap %p mds%d seq %d %s\n",
inode, cap, mds, seq, ceph_cap_string(newcaps));
@ -2407,8 +2440,12 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
from_kgid(&init_user_ns, inode->i_gid));
}
if ((issued & CEPH_CAP_LINK_EXCL) == 0)
if ((issued & CEPH_CAP_LINK_EXCL) == 0) {
set_nlink(inode, le32_to_cpu(grant->nlink));
if (inode->i_nlink == 0 &&
(newcaps & (CEPH_CAP_LINK_SHARED | CEPH_CAP_LINK_EXCL)))
deleted_inode = 1;
}
if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && grant->xattr_len) {
int len = le32_to_cpu(grant->xattr_len);
@ -2517,6 +2554,8 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
ceph_queue_writeback(inode);
if (queue_invalidate)
ceph_queue_invalidate(inode);
if (deleted_inode)
invalidate_aliases(inode);
if (wake)
wake_up_all(&ci->i_cap_wq);