From: Sage Weil <sage@newdream.net>
Date: Tue, 4 May 2010 05:08:02 +0000 (-0700)
Subject: ceph: set dn offset when spliced
X-Git-Tag: firefly_0821_release~9833^2~1630^2~37
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1cd3935bedccf592d44343890251452a6dd74fc4;p=firefly-linux-kernel-4.4.55.git
ceph: set dn offset when spliced
We want to assign an offset when the dentry goes from null to linked, which
is always done by splice_dentry(). Notably, we should NOT assign an
offset when a dentry is first created and is still null.
BUG if we try to splice a non-null dentry (we shouldn't).
Signed-off-by: Sage Weil <sage@newdream.net>
---
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 0b0a39d05ca6..d3bb8132a1aa 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -128,7 +128,8 @@ more:
dentry = list_entry(p, struct dentry, d_u.d_child);
di = ceph_dentry(dentry);
while (1) {
- dout(" p %p/%p d_subdirs %p/%p\n", p->prev, p->next,
+ dout(" p %p/%p %s d_subdirs %p/%p\n", p->prev, p->next,
+ d_unhashed(dentry) ? "!hashed" : "hashed",
parent->d_subdirs.prev, parent->d_subdirs.next);
if (p == &parent->d_subdirs) {
fi->at_end = 1;
@@ -571,7 +572,6 @@ static struct dentry *ceph_lookup(struct inode *dir, struct dentry *dentry,
!is_root_ceph_dentry(dir, dentry) &&
(ci->i_ceph_flags & CEPH_I_COMPLETE) &&
(__ceph_caps_issued_mask(ci, CEPH_CAP_FILE_SHARED, 1))) {
- di->offset = ci->i_max_offset++;
spin_unlock(&dir->i_lock);
dout(" dir %p complete, -ENOENT\n", dir);
d_add(dentry, NULL);
@@ -984,8 +984,9 @@ static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct inode *dir = dentry->d_parent->d_inode;
- dout("d_revalidate %p '%.*s' inode %p\n", dentry,
- dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
+ dout("d_revalidate %p '%.*s' inode %p offset %lld\n", dentry,
+ dentry->d_name.len, dentry->d_name.name, dentry->d_inode,
+ ceph_dentry(dentry)->offset);
/* always trust cached snapped dentries, snapdir dentry */
if (ceph_snap(dir) != CEPH_NOSNAP) {
@@ -1177,8 +1178,8 @@ void ceph_dentry_lru_touch(struct dentry *dn)
struct ceph_dentry_info *di = ceph_dentry(dn);
struct ceph_mds_client *mdsc;
- dout("dentry_lru_touch %p %p '%.*s'\n", di, dn,
- dn->d_name.len, dn->d_name.name);
+ dout("dentry_lru_touch %p %p '%.*s' (offset %lld)\n", di, dn,
+ dn->d_name.len, dn->d_name.name, di->offset);
if (di) {
mdsc = &ceph_sb_to_client(dn->d_sb)->mdsc;
spin_lock(&mdsc->dentry_lru_lock);
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index aa22a0bce52f..1bcf98bd0255 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -803,6 +803,37 @@ out_unlock:
return;
}
+/*
+ * Set dentry's directory position based on the current dir's max, and
+ * order it in d_subdirs, so that dcache_readdir behaves.
+ */
+static void ceph_set_dentry_offset(struct dentry *dn)
+{
+ struct dentry *dir = dn->d_parent;
+ struct inode *inode = dn->d_parent->d_inode;
+ struct ceph_dentry_info *di;
+
+ BUG_ON(!inode);
+
+ di = ceph_dentry(dn);
+
+ spin_lock(&inode->i_lock);
+ if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
+ spin_unlock(&inode->i_lock);
+ return;
+ }
+ di->offset = ceph_inode(inode)->i_max_offset++;
+ spin_unlock(&inode->i_lock);
+
+ spin_lock(&dcache_lock);
+ spin_lock(&dn->d_lock);
+ list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);
+ dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
+ dn->d_u.d_child.prev, dn->d_u.d_child.next);
+ spin_unlock(&dn->d_lock);
+ spin_unlock(&dcache_lock);
+}
+
/*
* splice a dentry to an inode.
* caller must hold directory i_mutex for this to be safe.
@@ -816,6 +847,8 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
{
struct dentry *realdn;
+ BUG_ON(dn->d_inode);
+
/* dn must be unhashed */
if (!d_unhashed(dn))
d_drop(dn);
@@ -837,47 +870,16 @@ static struct dentry *splice_dentry(struct dentry *dn, struct inode *in,
dn = realdn;
} else {
BUG_ON(!ceph_dentry(dn));
-
dout("dn %p attached to %p ino %llx.%llx\n",
dn, dn->d_inode, ceph_vinop(dn->d_inode));
}
if ((!prehash || *prehash) && d_unhashed(dn))
d_rehash(dn);
+ ceph_set_dentry_offset(dn);
out:
return dn;
}
-/*
- * Set dentry's directory position based on the current dir's max, and
- * order it in d_subdirs, so that dcache_readdir behaves.
- */
-static void ceph_set_dentry_offset(struct dentry *dn)
-{
- struct dentry *dir = dn->d_parent;
- struct inode *inode = dn->d_parent->d_inode;
- struct ceph_dentry_info *di;
-
- BUG_ON(!inode);
-
- di = ceph_dentry(dn);
-
- spin_lock(&inode->i_lock);
- if ((ceph_inode(inode)->i_ceph_flags & CEPH_I_COMPLETE) == 0) {
- spin_unlock(&inode->i_lock);
- return;
- }
- di->offset = ceph_inode(inode)->i_max_offset++;
- spin_unlock(&inode->i_lock);
-
- spin_lock(&dcache_lock);
- spin_lock(&dn->d_lock);
- list_move_tail(&dir->d_subdirs, &dn->d_u.d_child);
- dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset,
- dn->d_u.d_child.prev, dn->d_u.d_child.next);
- spin_unlock(&dn->d_lock);
- spin_unlock(&dcache_lock);
-}
-
/*
* Incorporate results into the local cache. This is either just
* one inode, or a directory, dentry, and possibly linked-to inode (e.g.,
@@ -1030,6 +1032,9 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
ceph_invalidate_dentry_lease(dn);
/* take overwritten dentry's readdir offset */
+ dout("dn %p gets %p offset %lld (old offset %lld)\n",
+ req->r_old_dentry, dn, ceph_dentry(dn)->offset,
+ ceph_dentry(req->r_old_dentry)->offset);
ceph_dentry(req->r_old_dentry)->offset =
ceph_dentry(dn)->offset;
@@ -1074,7 +1079,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
goto done;
}
req->r_dentry = dn; /* may have spliced */
- ceph_set_dentry_offset(dn);
igrab(in);
} else if (ceph_ino(in) == vino.ino &&
ceph_snap(in) == vino.snap) {
@@ -1117,7 +1121,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
err = PTR_ERR(dn);
goto done;
}
- ceph_set_dentry_offset(dn);
req->r_dentry = dn; /* may have spliced */
igrab(in);
rinfo->head->is_dentry = 1; /* fool notrace handlers */