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Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2 

* 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mfasheh/ocfs2:
  ocfs2: add quota call to ocfs2_remove_btree_range()
  ocfs2: Wakeup the downconvert thread after a successful cancel convert
  ocfs2: Access the xattr bucket only before modifying it.
  configfs: Silence lockdep on mkdir(), rmdir() and configfs_depend_item()
  ocfs2: Fix possible deadlock in ocfs2_write_dquot()
  ocfs2: Push out dropping of dentry lock to ocfs2_wq
This commit is contained in:
Linus Torvalds 2009-02-03 16:50:20 -08:00
parent b987e8e5a9 fd4ef23196
commit 3e1c400513
9 changed files with 133 additions and 14 deletions
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59
fs/configfs/dir.c
View File

@ -553,12 +553,24 @@ static void detach_groups(struct config_group *group)
child = sd->s_dentry;
/*
* Note: we hide this from lockdep since we have no way
* to teach lockdep about recursive
* I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
* in an inode tree, which are valid as soon as
* I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
* parent inode to one of its children.
*/
lockdep_off();
mutex_lock(&child->d_inode->i_mutex);
lockdep_on();
configfs_detach_group(sd->s_element);
child->d_inode->i_flags |= S_DEAD;
lockdep_off();
mutex_unlock(&child->d_inode->i_mutex);
lockdep_on();
d_delete(child);
dput(child);
@ -748,11 +760,22 @@ static int configfs_attach_item(struct config_item *parent_item,
* We are going to remove an inode and its dentry but
* the VFS may already have hit and used them. Thus,
* we must lock them as rmdir() would.
*
* Note: we hide this from lockdep since we have no way
* to teach lockdep about recursive
* I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
* in an inode tree, which are valid as soon as
* I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
* parent inode to one of its children.
*/
lockdep_off();
mutex_lock(&dentry->d_inode->i_mutex);
lockdep_on();
configfs_remove_dir(item);
dentry->d_inode->i_flags |= S_DEAD;
lockdep_off();
mutex_unlock(&dentry->d_inode->i_mutex);
lockdep_on();
d_delete(dentry);
}
}
@ -787,14 +810,25 @@ static int configfs_attach_group(struct config_item *parent_item,
*
* We must also lock the inode to remove it safely in case of
* error, as rmdir() would.
*
* Note: we hide this from lockdep since we have no way
* to teach lockdep about recursive
* I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
* in an inode tree, which are valid as soon as
* I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
* parent inode to one of its children.
*/
lockdep_off();
mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD);
lockdep_on();
ret = populate_groups(to_config_group(item));
if (ret) {
configfs_detach_item(item);
dentry->d_inode->i_flags |= S_DEAD;
}
lockdep_off();
mutex_unlock(&dentry->d_inode->i_mutex);
lockdep_on();
if (ret)
d_delete(dentry);
}
@ -956,7 +990,17 @@ static int configfs_depend_prep(struct dentry *origin,
BUG_ON(!origin || !sd);
/* Lock this guy on the way down */
/*
* Note: we hide this from lockdep since we have no way
* to teach lockdep about recursive
* I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
* in an inode tree, which are valid as soon as
* I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
* parent inode to one of its children.
*/
lockdep_off();
mutex_lock(&sd->s_dentry->d_inode->i_mutex);
lockdep_on();
if (sd->s_element == target) /* Boo-yah */
goto out;
@ -970,7 +1014,9 @@ static int configfs_depend_prep(struct dentry *origin,
}
/* We looped all our children and didn't find target */
lockdep_off();
mutex_unlock(&sd->s_dentry->d_inode->i_mutex);
lockdep_on();
ret = -ENOENT;
out:
@ -990,11 +1036,16 @@ static void configfs_depend_rollback(struct dentry *origin,
struct dentry *dentry = item->ci_dentry;
while (dentry != origin) {
/* See comments in configfs_depend_prep() */
lockdep_off();
mutex_unlock(&dentry->d_inode->i_mutex);
lockdep_on();
dentry = dentry->d_parent;
}
lockdep_off();
mutex_unlock(&origin->d_inode->i_mutex);
lockdep_on();
}
int configfs_depend_item(struct configfs_subsystem *subsys,
@ -1329,8 +1380,16 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
}
/* Wait until the racing operation terminates */
/*
* Note: we hide this from lockdep since we are locked
* with subclass I_MUTEX_NORMAL from vfs_rmdir() (why
* not I_MUTEX_CHILD?), and I_MUTEX_XATTR or
* I_MUTEX_QUOTA are not relevant for the locked inode.
*/
lockdep_off();
mutex_lock(wait_mutex);
mutex_unlock(wait_mutex);
lockdep_on();
}
} while (ret == -EAGAIN);

3
fs/ocfs2/alloc.c
View File

@ -5390,6 +5390,9 @@ int ocfs2_remove_btree_range(struct inode *inode,
goto out;
}
vfs_dq_free_space_nodirty(inode,
ocfs2_clusters_to_bytes(inode->i_sb, len));
ret = ocfs2_remove_extent(inode, et, cpos, len, handle, meta_ac,
dealloc);
if (ret) {

42
fs/ocfs2/dcache.c
View File

@ -38,6 +38,7 @@
#include "dlmglue.h"
#include "file.h"
#include "inode.h"
#include "super.h"
static int ocfs2_dentry_revalidate(struct dentry *dentry,
@ -294,6 +295,34 @@ out_attach:
return ret;
}
static 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 */
void ocfs2_drop_dl_inodes(struct work_struct *work)
{
struct ocfs2_super *osb = container_of(work, struct ocfs2_super,
dentry_lock_work);
struct ocfs2_dentry_lock *dl;
int drop_count = DL_INODE_DROP_COUNT;
spin_lock(&dentry_list_lock);
while (osb->dentry_lock_list && 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);
}
if (osb->dentry_lock_list)
queue_work(ocfs2_wq, &osb->dentry_lock_work);
spin_unlock(&dentry_list_lock);
}
/*
* ocfs2_dentry_iput() and friends.
*
@ -318,16 +347,23 @@ out_attach:
static void ocfs2_drop_dentry_lock(struct ocfs2_super *osb,
struct ocfs2_dentry_lock *dl)
{
iput(dl->dl_inode);
ocfs2_simple_drop_lockres(osb, &dl->dl_lockres);
ocfs2_lock_res_free(&dl->dl_lockres);
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)
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);

9
fs/ocfs2/dcache.h
View File

@ -29,8 +29,13 @@
extern struct dentry_operations ocfs2_dentry_ops;
struct ocfs2_dentry_lock {
/* Use count of dentry lock */
unsigned int dl_count;
u64 dl_parent_blkno;
union {
/* Linked list of dentry locks to release */
struct ocfs2_dentry_lock *dl_next;
u64 dl_parent_blkno;
};
/*
* The ocfs2_dentry_lock keeps an inode reference until
@ -47,6 +52,8 @@ int ocfs2_dentry_attach_lock(struct dentry *dentry, struct inode *inode,
void ocfs2_dentry_lock_put(struct ocfs2_super *osb,
struct ocfs2_dentry_lock *dl);
void ocfs2_drop_dl_inodes(struct work_struct *work);
struct dentry *ocfs2_find_local_alias(struct inode *inode, u64 parent_blkno,
int skip_unhashed);

4
fs/ocfs2/dlmglue.c
View File

@ -2860,6 +2860,10 @@ static void ocfs2_unlock_ast(void *opaque, int error)
case OCFS2_UNLOCK_CANCEL_CONVERT:
mlog(0, "Cancel convert success for %s\n", lockres->l_name);
lockres->l_action = OCFS2_AST_INVALID;
/* Downconvert thread may have requeued this lock, we
* need to wake it. */
if (lockres->l_flags & OCFS2_LOCK_BLOCKED)
ocfs2_wake_downconvert_thread(ocfs2_get_lockres_osb(lockres));
break;
case OCFS2_UNLOCK_DROP_LOCK:
lockres->l_level = DLM_LOCK_IV;

6
fs/ocfs2/ocfs2.h
View File

@ -210,6 +210,7 @@ struct ocfs2_journal;
struct ocfs2_slot_info;
struct ocfs2_recovery_map;
struct ocfs2_quota_recovery;
struct ocfs2_dentry_lock;
struct ocfs2_super
{
struct task_struct *commit_task;
@ -325,6 +326,11 @@ struct ocfs2_super
struct list_head blocked_lock_list;
unsigned long blocked_lock_count;
/* List of dentry locks to release. Anyone can add locks to
* the list, ocfs2_wq processes the list */
struct ocfs2_dentry_lock *dentry_lock_list;
struct work_struct dentry_lock_work;
wait_queue_head_t osb_mount_event;
/* Truncate log info */

4
fs/ocfs2/quota_global.c
View File

@ -754,7 +754,9 @@ static int ocfs2_mark_dquot_dirty(struct dquot *dquot)
if (dquot->dq_flags & mask)
sync = 1;
spin_unlock(&dq_data_lock);
if (!sync) {
/* This is a slight hack but we can't afford getting global quota
* lock if we already have a transaction started. */
if (!sync || journal_current_handle()) {
status = ocfs2_write_dquot(dquot);
goto out;
}

3
fs/ocfs2/super.c
View File

@ -1887,6 +1887,9 @@ static int ocfs2_initialize_super(struct super_block *sb,
INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
journal->j_state = OCFS2_JOURNAL_FREE;
INIT_WORK(&osb->dentry_lock_work, ocfs2_drop_dl_inodes);
osb->dentry_lock_list = NULL;
/* get some pseudo constants for clustersize bits */
osb->s_clustersize_bits =
le32_to_cpu(di->id2.i_super.s_clustersize_bits);

17
fs/ocfs2/xattr.c
View File

@ -4729,13 +4729,6 @@ static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
vb.vb_xv = (struct ocfs2_xattr_value_root *)
(vb.vb_bh->b_data + offset % blocksize);
ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
/*
* From here on out we have to dirty the bucket. The generic
* value calls only modify one of the bucket's bhs, but we need
@ -4748,12 +4741,18 @@ static int ocfs2_xattr_bucket_value_truncate(struct inode *inode,
ret = ocfs2_xattr_value_truncate(inode, &vb, len, ctxt);
if (ret) {
mlog_errno(ret);
goto out_dirty;
goto out;
}
ret = ocfs2_xattr_bucket_journal_access(ctxt->handle, bucket,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret) {
mlog_errno(ret);
goto out;
}
xe->xe_value_size = cpu_to_le64(len);
out_dirty:
ocfs2_xattr_bucket_journal_dirty(ctxt->handle, bucket);
out: