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ocfs2: Remove special casing for inode creation in ocfs2_dentry_attach_lock() 

We can't use LKM_LOCAL for new dentry locks because an unlink and subsequent
re-create of a name/inode pair may result in the lock still being mastered
somewhere in the cluster.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2006-09-21 16:51:28 -07:00
parent 1ba9da2ffa
commit 0027dd5bc2
3 changed files with 14 additions and 37 deletions
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39
fs/ocfs2/dcache.c
View File

@ -183,9 +183,6 @@ DEFINE_SPINLOCK(dentry_attach_lock);
* The dir cluster lock (held at either PR or EX mode) protects us
* from unlink and rename on other nodes.
*
* The 'create' flag tells us whether we're doing this as a result of
* a file creation.
*
* A dput() can happen asynchronously due to pruning, so we cover
* attaching and detaching the dentry lock with a
* dentry_attach_lock.
@ -199,16 +196,15 @@ DEFINE_SPINLOCK(dentry_attach_lock);
*/
int ocfs2_dentry_attach_lock(struct dentry *dentry,
struct inode *inode,
u64 parent_blkno,
int create)
u64 parent_blkno)
{
int ret;
struct dentry *alias;
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
mlog(0, "Attach \"%.*s\", parent %llu, create %d, fsdata: %p\n",
mlog(0, "Attach \"%.*s\", parent %llu, fsdata: %p\n",
dentry->d_name.len, dentry->d_name.name,
(unsigned long long)parent_blkno, create, dl);
(unsigned long long)parent_blkno, dl);
/*
* Negative dentry. We ignore these for now.
@ -242,10 +238,9 @@ int ocfs2_dentry_attach_lock(struct dentry *dentry,
* since we have it pinned, so our reference is safe.
*/
dl = alias->d_fsdata;
mlog_bug_on_msg(!dl, "parent %llu, ino %llu, create %d\n",
mlog_bug_on_msg(!dl, "parent %llu, ino %llu\n",
(unsigned long long)parent_blkno,
(unsigned long long)OCFS2_I(inode)->ip_blkno,
create);
(unsigned long long)OCFS2_I(inode)->ip_blkno);
mlog_bug_on_msg(dl->dl_parent_blkno != parent_blkno,
" \"%.*s\": old parent: %llu, new: %llu\n",
@ -283,32 +278,17 @@ int ocfs2_dentry_attach_lock(struct dentry *dentry,
dl->dl_count++;
spin_unlock(&dentry_attach_lock);
/*
* Creation of a new file means that nobody can possibly have
* this name in the system, which means that acquiry of those
* locks can easily be optimized.
*/
if (create) {
ret = ocfs2_create_new_lock(OCFS2_SB(inode->i_sb),
&dl->dl_lockres, 0);
if (ret)
mlog_errno(ret);
goto out;
}
/*
* This actually gets us our PRMODE level lock. From now on,
* we'll have a notification if one of these names is
* destroyed on another node.
*/
ret = ocfs2_dentry_lock(dentry, 0);
if (ret) {
if (!ret)
ocfs2_dentry_unlock(dentry, 0);
else
mlog_errno(ret);
goto out;
}
ocfs2_dentry_unlock(dentry, 0);
out:
dput(alias);
return ret;
@ -419,8 +399,7 @@ void ocfs2_dentry_move(struct dentry *dentry, struct dentry *target,
ocfs2_dentry_lock_put(osb, dentry->d_fsdata);
dentry->d_fsdata = NULL;
ret = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(new_dir)->ip_blkno, 0);
ret = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(new_dir)->ip_blkno);
if (ret)
mlog_errno(ret);

2
fs/ocfs2/dcache.h
View File

@ -42,7 +42,7 @@ struct ocfs2_dentry_lock {
};
int ocfs2_dentry_attach_lock(struct dentry *dentry, struct inode *inode,
u64 parent_blkno, int create);
u64 parent_blkno);
void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
struct ocfs2_dentry_lock *dl);

10
fs/ocfs2/namei.c
View File

@ -217,7 +217,7 @@ static struct dentry *ocfs2_lookup(struct inode *dir, struct dentry *dentry,
dentry = ret;
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno, 0);
OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
ret = ERR_PTR(status);
@ -441,7 +441,7 @@ static int ocfs2_mknod(struct inode *dir,
}
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno, 1);
OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto leave;
@ -754,8 +754,7 @@ static int ocfs2_link(struct dentry *old_dentry,
goto bail;
}
err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno,
0);
err = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
if (err) {
mlog_errno(err);
goto bail;
@ -1716,8 +1715,7 @@ static int ocfs2_symlink(struct inode *dir,
goto bail;
}
status = ocfs2_dentry_attach_lock(dentry, inode,
OCFS2_I(dir)->ip_blkno, 1);
status = ocfs2_dentry_attach_lock(dentry, inode, OCFS2_I(dir)->ip_blkno);
if (status) {
mlog_errno(status);
goto bail;