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ceph: introduce a new inode flag indicating if cached dentries are ordered

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After creating/deleting/renaming file, offsets of sibling dentries may
change. So we can not use cached dentries to satisfy readdir. But we can
still use the cached dentries to conclude -ENOENT for lookup.

This patch introduces a new inode flag indicating if child dentries are
ordered. The flag is set at the same time marking a directory complete.
After creating/deleting/renaming file, we clear the flag on directory
inode. This prevents ceph_readdir() from using cached dentries to satisfy
readdir syscall.

Signed-off-by: Yan, Zheng <zyan@redhat.com>
This commit is contained in:
Yan, Zheng
2014-10-21 18:09:56 -07:00
committed by Ilya Dryomov
parent 4965fc38c4
commit 70db4f3629
3 changed files with 55 additions and 19 deletions
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13
fs/ceph/inode.c
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@@ -389,6 +389,7 @@ struct inode *ceph_alloc_inode(struct super_block *sb)
ci->i_version = 0;
ci->i_time_warp_seq = 0;
ci->i_ceph_flags = 0;
ci->i_ordered_count = 0;
atomic_set(&ci->i_release_count, 1);
atomic_set(&ci->i_complete_count, 0);
ci->i_symlink = NULL;
@@ -845,7 +846,8 @@ static int fill_inode(struct inode *inode,
(issued & CEPH_CAP_FILE_EXCL) == 0 &&
!__ceph_dir_is_complete(ci)) {
dout(" marking %p complete (empty)\n", inode);
__ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count));
__ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count),
ci->i_ordered_count);
}
/* were we issued a capability? */
@@ -1206,8 +1208,8 @@ retry_lookup:
ceph_invalidate_dentry_lease(dn);
/* d_move screws up sibling dentries' offsets */
ceph_dir_clear_complete(dir);
ceph_dir_clear_complete(olddir);
ceph_dir_clear_ordered(dir);
ceph_dir_clear_ordered(olddir);
dout("dn %p gets new offset %lld\n", req->r_old_dentry,
ceph_dentry(req->r_old_dentry)->offset);
@@ -1219,6 +1221,7 @@ retry_lookup:
if (!rinfo->head->is_target) {
dout("fill_trace null dentry\n");
if (dn->d_inode) {
ceph_dir_clear_ordered(dir);
dout("d_delete %p\n", dn);
d_delete(dn);
} else {
@@ -1235,7 +1238,7 @@ retry_lookup:
/* attach proper inode */
if (!dn->d_inode) {
ceph_dir_clear_complete(dir);
ceph_dir_clear_ordered(dir);
ihold(in);
dn = splice_dentry(dn, in, &have_lease);
if (IS_ERR(dn)) {
@@ -1265,7 +1268,7 @@ retry_lookup:
BUG_ON(!dir);
BUG_ON(ceph_snap(dir) != CEPH_SNAPDIR);
dout(" linking snapped dir %p to dn %p\n", in, dn);
ceph_dir_clear_complete(dir);
ceph_dir_clear_ordered(dir);
ihold(in);
dn = splice_dentry(dn, in, NULL);
if (IS_ERR(dn)) {