#include "dlmglue.h"
#include "file.h"
#include "inode.h"
+#include "super.h"
static int ocfs2_dentry_revalidate(struct dentry *dentry,
goto bail;
}
+ /*
+ * If the last lookup failed to create dentry lock, let us
+ * redo it.
+ */
+ if (!dentry->d_fsdata) {
+ mlog(0, "Inode %llu doesn't have dentry lock, "
+ "returning false\n",
+ (unsigned long long)OCFS2_I(inode)->ip_blkno);
+ goto bail;
+ }
+
ret = 1;
bail:
/*
* Walk the inode alias list, and find a dentry which has a given
* parent. ocfs2_dentry_attach_lock() wants to find _any_ alias as it
- * is looking for a dentry_lock reference. The vote thread is looking
- * to unhash aliases, so we allow it to skip any that already have
- * that property.
+ * is looking for a dentry_lock reference. The downconvert thread is
+ * looking to unhash aliases, so we allow it to skip any that already
+ * have that property.
*/
struct dentry *ocfs2_find_local_alias(struct inode *inode,
u64 parent_blkno,
* 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.
*/
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.
* 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",
dl->dl_count = 0;
/*
* Does this have to happen below, for all attaches, in case
- * the struct inode gets blown away by votes?
+ * the struct inode gets blown away by the downconvert thread?
*/
dl->dl_inode = igrab(inode);
dl->dl_parent_blkno = parent_blkno;
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;
+
+ /*
+ * In case of error, manually free the allocation and do the iput().
+ * We need to do this because error here means no d_instantiate(),
+ * which means iput() will not be called during dput(dentry).
+ */
+ if (ret < 0 && !alias) {
+ ocfs2_lock_res_free(&dl->dl_lockres);
+ BUG_ON(dl->dl_count != 1);
+ spin_lock(&dentry_attach_lock);
+ dentry->d_fsdata = NULL;
+ spin_unlock(&dentry_attach_lock);
+ kfree(dl);
+ iput(inode);
}
- ocfs2_dentry_unlock(dentry, 0);
-out:
dput(alias);
return ret;
}
+DEFINE_SPINLOCK(dentry_list_lock);
+
+/* We limit the number of dentry locks to drop in one go. We have
+ * this limit so that we don't starve other users of ocfs2_wq. */
+#define DL_INODE_DROP_COUNT 64
+
+/* Drop inode references from dentry locks */
+static void __ocfs2_drop_dl_inodes(struct ocfs2_super *osb, int drop_count)
+{
+ struct ocfs2_dentry_lock *dl;
+
+ spin_lock(&dentry_list_lock);
+ while (osb->dentry_lock_list && (drop_count < 0 || drop_count--)) {
+ dl = osb->dentry_lock_list;
+ osb->dentry_lock_list = dl->dl_next;
+ spin_unlock(&dentry_list_lock);
+ iput(dl->dl_inode);
+ kfree(dl);
+ spin_lock(&dentry_list_lock);
+ }
+ spin_unlock(&dentry_list_lock);
+}
+
+void ocfs2_drop_dl_inodes(struct work_struct *work)
+{
+ struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
+ dentry_lock_work);
+
+ __ocfs2_drop_dl_inodes(osb, DL_INODE_DROP_COUNT);
+ /*
+ * Don't queue dropping if umount is in progress. We flush the
+ * list in ocfs2_dismount_volume
+ */
+ spin_lock(&dentry_list_lock);
+ if (osb->dentry_lock_list &&
+ !ocfs2_test_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED))
+ queue_work(ocfs2_wq, &osb->dentry_lock_work);
+ spin_unlock(&dentry_list_lock);
+}
+
+/* Flush the whole work queue */
+void ocfs2_drop_all_dl_inodes(struct ocfs2_super *osb)
+{
+ __ocfs2_drop_dl_inodes(osb, -1);
+}
+
/*
* ocfs2_dentry_iput() and friends.
*
{
ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
ocfs2_lock_res_free(&dl->dl_lockres);
- iput(dl->dl_inode);
- kfree(dl);
+
+ /* We leave dropping of inode reference to ocfs2_wq as that can
+ * possibly lead to inode deletion which gets tricky */
+ spin_lock(&dentry_list_lock);
+ if (!osb->dentry_lock_list &&
+ !ocfs2_test_osb_flag(osb, OCFS2_OSB_DROP_DENTRY_LOCK_IMMED))
+ queue_work(ocfs2_wq, &osb->dentry_lock_work);
+ dl->dl_next = osb->dentry_lock_list;
+ osb->dentry_lock_list = dl;
+ spin_unlock(&dentry_list_lock);
}
void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
struct ocfs2_dentry_lock *dl)
{
- int unlock = 0;
+ int unlock;
BUG_ON(dl->dl_count == 0);
{
struct ocfs2_dentry_lock *dl = dentry->d_fsdata;
- mlog_bug_on_msg(!dl && !(dentry->d_flags & DCACHE_DISCONNECTED),
- "dentry: %.*s\n", dentry->d_name.len,
- dentry->d_name.name);
+ if (!dl) {
+ /*
+ * No dentry lock is ok if we're disconnected or
+ * unhashed.
+ */
+ if (!(dentry->d_flags & DCACHE_DISCONNECTED) &&
+ !d_unhashed(dentry)) {
+ unsigned long long ino = 0ULL;
+ if (inode)
+ ino = (unsigned long long)OCFS2_I(inode)->ip_blkno;
+ mlog(ML_ERROR, "Dentry is missing cluster lock. "
+ "inode: %llu, d_flags: 0x%x, d_name: %.*s\n",
+ ino, dentry->d_flags, dentry->d_name.len,
+ dentry->d_name.name);
+ }
- if (!dl)
goto out;
+ }
mlog_bug_on_msg(dl->dl_count == 0, "dentry: %.*s, count: %u\n",
dentry->d_name.len, dentry->d_name.name,
* directory locks. The dentries have already been deleted on other
* nodes via ocfs2_remote_dentry_delete().
*
- * Normally, the VFS handles the d_move() for the file sytem, after
+ * Normally, the VFS handles the d_move() for the file system, after
* the ->rename() callback. OCFS2 wants to handle this internally, so
* the new lock can be created atomically with respect to the cluster.
*/
* XXX: Is there any advantage to dropping the lock here?
*/
if (old_dir == new_dir)
- return;
+ goto out_move;
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);
+
+out_move:
+ d_move(dentry, target);
}
-struct dentry_operations ocfs2_dentry_ops = {
+const struct dentry_operations ocfs2_dentry_ops = {
.d_revalidate = ocfs2_dentry_revalidate,
.d_iput = ocfs2_dentry_iput,
};
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff