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Btrfs: fix deadlocks with trylock on tree nodes 

The Btrfs tree trylock function is poorly named.  It always takes
the spinlock and backs off if the blocking lock is held.  This
can lead to surprising lockups because people expect it to really be a
trylock.

This commit makes it a pure trylock, both for the spinlock and the
blocking lock.  It also reworks the nested lock handling slightly to
avoid taking the read lock while a spinning write lock might be held.

Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Chris Mason 2014-06-19 14:16:52 -07:00
parent 47a306a748
commit ea4ebde02e
1 changed files with 46 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

80
fs/btrfs/locking.c
View File

@ -33,14 +33,14 @@ static void btrfs_assert_tree_read_locked(struct extent_buffer *eb);
*/
void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw)
{
if (eb->lock_nested) {
read_lock(&eb->lock);
if (eb->lock_nested && current->pid == eb->lock_owner) {
read_unlock(&eb->lock);
return;
}
read_unlock(&eb->lock);
}
/*
* no lock is required. The lock owner may change if
* we have a read lock, but it won't change to or away
* from us. If we have the write lock, we are the owner
* and it'll never change.
*/
if (eb->lock_nested && current->pid == eb->lock_owner)
return;
if (rw == BTRFS_WRITE_LOCK) {
if (atomic_read(&eb->blocking_writers) == 0) {
WARN_ON(atomic_read(&eb->spinning_writers) != 1);
@ -65,14 +65,15 @@ void btrfs_set_lock_blocking_rw(struct extent_buffer *eb, int rw)
*/
void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw)
{
if (eb->lock_nested) {
read_lock(&eb->lock);
if (eb->lock_nested && current->pid == eb->lock_owner) {
read_unlock(&eb->lock);
return;
}
read_unlock(&eb->lock);
}
/*
* no lock is required. The lock owner may change if
* we have a read lock, but it won't change to or away
* from us. If we have the write lock, we are the owner
* and it'll never change.
*/
if (eb->lock_nested && current->pid == eb->lock_owner)
return;
if (rw == BTRFS_WRITE_LOCK_BLOCKING) {
BUG_ON(atomic_read(&eb->blocking_writers) != 1);
write_lock(&eb->lock);
@ -99,6 +100,9 @@ void btrfs_clear_lock_blocking_rw(struct extent_buffer *eb, int rw)
void btrfs_tree_read_lock(struct extent_buffer *eb)
{
again:
BUG_ON(!atomic_read(&eb->blocking_writers) &&
current->pid == eb->lock_owner);
read_lock(&eb->lock);
if (atomic_read(&eb->blocking_writers) &&
current->pid == eb->lock_owner) {
@ -132,7 +136,9 @@ int btrfs_try_tree_read_lock(struct extent_buffer *eb)
if (atomic_read(&eb->blocking_writers))
return 0;
read_lock(&eb->lock);
if (!read_trylock(&eb->lock))
return 0;
if (atomic_read(&eb->blocking_writers)) {
read_unlock(&eb->lock);
return 0;
@ -151,7 +157,10 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
if (atomic_read(&eb->blocking_writers) ||
atomic_read(&eb->blocking_readers))
return 0;
write_lock(&eb->lock);
if (!write_trylock(&eb->lock))
return 0;
if (atomic_read(&eb->blocking_writers) ||
atomic_read(&eb->blocking_readers)) {
write_unlock(&eb->lock);
@ -168,14 +177,15 @@ int btrfs_try_tree_write_lock(struct extent_buffer *eb)
*/
void btrfs_tree_read_unlock(struct extent_buffer *eb)
{
if (eb->lock_nested) {
read_lock(&eb->lock);
if (eb->lock_nested && current->pid == eb->lock_owner) {
eb->lock_nested = 0;
read_unlock(&eb->lock);
return;
}
read_unlock(&eb->lock);
/*
* if we're nested, we have the write lock. No new locking
* is needed as long as we are the lock owner.
* The write unlock will do a barrier for us, and the lock_nested
* field only matters to the lock owner.
*/
if (eb->lock_nested && current->pid == eb->lock_owner) {
eb->lock_nested = 0;
return;
}
btrfs_assert_tree_read_locked(eb);
WARN_ON(atomic_read(&eb->spinning_readers) == 0);
@ -189,14 +199,15 @@ void btrfs_tree_read_unlock(struct extent_buffer *eb)
*/
void btrfs_tree_read_unlock_blocking(struct extent_buffer *eb)
{
if (eb->lock_nested) {
read_lock(&eb->lock);
if (eb->lock_nested && current->pid == eb->lock_owner) {
eb->lock_nested = 0;
read_unlock(&eb->lock);
return;
}
read_unlock(&eb->lock);
/*
* if we're nested, we have the write lock. No new locking
* is needed as long as we are the lock owner.
* The write unlock will do a barrier for us, and the lock_nested
* field only matters to the lock owner.
*/
if (eb->lock_nested && current->pid == eb->lock_owner) {
eb->lock_nested = 0;
return;
}
btrfs_assert_tree_read_locked(eb);
WARN_ON(atomic_read(&eb->blocking_readers) == 0);
@ -244,6 +255,7 @@ void btrfs_tree_unlock(struct extent_buffer *eb)
BUG_ON(blockers > 1);
btrfs_assert_tree_locked(eb);
eb->lock_owner = 0;
atomic_dec(&eb->write_locks);
if (blockers) {