From: Jeff Mahoney <jeffm@suse.com>
To: reiserfs-devel@vger.kernel.org
Cc: jack@suse.cz
Subject: [patch v3 3/3] reiserfs: locking, release lock around quota operations
Date: Wed, 07 Aug 2013 12:35:18 -0400 [thread overview]
Message-ID: <20130807163550.684219995@suse.com> (raw)
In-Reply-To: 20130807163515.986450231@suse.com
[-- Attachment #1: reiserfs/reiserfs-locking-release-lock-around-quota-operations --]
[-- Type: text/plain, Size: 12820 bytes --]
Previous commits released the write lock across quota operations but
missed several places. In particular, the free operations can also
call into the file system code and take the write lock, causing
deadlocks.
This patch introduces some more helpers and uses them for quota call
sites. Without this patch applied, reiserfs + quotas runs into deadlocks
under anything more than trivial load.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
---
fs/reiserfs/bitmap.c | 17 +++++++++++++++--
fs/reiserfs/inode.c | 19 +++++++++++--------
fs/reiserfs/stree.c | 28 +++++++++++++++++++++++-----
fs/reiserfs/super.c | 22 ++++++++++++++--------
4 files changed, 63 insertions(+), 23 deletions(-)
--- a/fs/reiserfs/bitmap.c 2013-08-07 10:23:33.885587547 -0400
+++ b/fs/reiserfs/bitmap.c 2013-08-07 10:23:35.761559089 -0400
@@ -423,8 +423,11 @@ static void _reiserfs_free_block(struct
set_sb_free_blocks(rs, sb_free_blocks(rs) + 1);
journal_mark_dirty(th, s, sbh);
- if (for_unformatted)
+ if (for_unformatted) {
+ int depth = reiserfs_write_unlock_nested(s);
dquot_free_block_nodirty(inode, 1);
+ reiserfs_write_lock_nested(s, depth);
+ }
}
void reiserfs_free_block(struct reiserfs_transaction_handle *th,
@@ -1128,6 +1131,7 @@ static inline int blocknrs_and_prealloc_
b_blocknr_t finish = SB_BLOCK_COUNT(s) - 1;
int passno = 0;
int nr_allocated = 0;
+ int depth;
determine_prealloc_size(hint);
if (!hint->formatted_node) {
@@ -1137,10 +1141,13 @@ static inline int blocknrs_and_prealloc_
"reiserquota: allocating %d blocks id=%u",
amount_needed, hint->inode->i_uid);
#endif
+ depth = reiserfs_write_unlock_nested(s);
quota_ret =
dquot_alloc_block_nodirty(hint->inode, amount_needed);
- if (quota_ret) /* Quota exceeded? */
+ if (quota_ret) { /* Quota exceeded? */
+ reiserfs_write_lock_nested(s, depth);
return QUOTA_EXCEEDED;
+ }
if (hint->preallocate && hint->prealloc_size) {
#ifdef REISERQUOTA_DEBUG
reiserfs_debug(s, REISERFS_DEBUG_CODE,
@@ -1153,6 +1160,7 @@ static inline int blocknrs_and_prealloc_
hint->preallocate = hint->prealloc_size = 0;
}
/* for unformatted nodes, force large allocations */
+ reiserfs_write_lock_nested(s, depth);
}
do {
@@ -1181,9 +1189,11 @@ static inline int blocknrs_and_prealloc_
hint->inode->i_uid);
#endif
/* Free not allocated blocks */
+ depth = reiserfs_write_unlock_nested(s);
dquot_free_block_nodirty(hint->inode,
amount_needed + hint->prealloc_size -
nr_allocated);
+ reiserfs_write_lock_nested(s, depth);
}
while (nr_allocated--)
reiserfs_free_block(hint->th, hint->inode,
@@ -1214,10 +1224,13 @@ static inline int blocknrs_and_prealloc_
REISERFS_I(hint->inode)->i_prealloc_count,
hint->inode->i_uid);
#endif
+
+ depth = reiserfs_write_unlock_nested(s);
dquot_free_block_nodirty(hint->inode, amount_needed +
hint->prealloc_size - nr_allocated -
REISERFS_I(hint->inode)->
i_prealloc_count);
+ reiserfs_write_lock_nested(s, depth);
}
return CARRY_ON;
--- a/fs/reiserfs/inode.c 2013-08-07 10:23:33.933586826 -0400
+++ b/fs/reiserfs/inode.c 2013-08-07 10:23:35.781558786 -0400
@@ -57,8 +57,11 @@ void reiserfs_evict_inode(struct inode *
/* Do quota update inside a transaction for journaled quotas. We must do that
* after delete_object so that quota updates go into the same transaction as
* stat data deletion */
- if (!err)
+ if (!err) {
+ int depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_free_inode(inode);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
+ }
if (journal_end(&th, inode->i_sb, jbegin_count))
goto out;
@@ -1768,7 +1771,7 @@ int reiserfs_new_inode(struct reiserfs_t
struct inode *inode,
struct reiserfs_security_handle *security)
{
- struct super_block *sb;
+ struct super_block *sb = dir->i_sb;
struct reiserfs_iget_args args;
INITIALIZE_PATH(path_to_key);
struct cpu_key key;
@@ -1780,9 +1783,9 @@ int reiserfs_new_inode(struct reiserfs_t
BUG_ON(!th->t_trans_id);
- reiserfs_write_unlock(inode->i_sb);
+ depth = reiserfs_write_unlock_nested(sb);
err = dquot_alloc_inode(inode);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(sb, depth);
if (err)
goto out_end_trans;
if (!dir->i_nlink) {
@@ -1790,8 +1793,6 @@ int reiserfs_new_inode(struct reiserfs_t
goto out_bad_inode;
}
- sb = dir->i_sb;
-
/* item head of new item */
ih.ih_key.k_dir_id = reiserfs_choose_packing(dir);
ih.ih_key.k_objectid = cpu_to_le32(reiserfs_get_unused_objectid(th));
@@ -1983,14 +1984,16 @@ int reiserfs_new_inode(struct reiserfs_t
INODE_PKEY(inode)->k_objectid = 0;
/* Quota change must be inside a transaction for journaling */
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_free_inode(inode);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
out_end_trans:
journal_end(th, th->t_super, th->t_blocks_allocated);
- reiserfs_write_unlock(inode->i_sb);
/* Drop can be outside and it needs more credits so it's better to have it outside */
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_drop(inode);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
inode->i_flags |= S_NOQUOTA;
make_bad_inode(inode);
--- a/fs/reiserfs/stree.c 2013-08-07 10:23:34.037585247 -0400
+++ b/fs/reiserfs/stree.c 2013-08-07 10:23:35.793558603 -0400
@@ -1190,6 +1190,7 @@ int reiserfs_delete_item(struct reiserfs
struct item_head *q_ih;
int quota_cut_bytes;
int ret_value, del_size, removed;
+ int depth;
#ifdef CONFIG_REISERFS_CHECK
char mode;
@@ -1299,7 +1300,9 @@ int reiserfs_delete_item(struct reiserfs
"reiserquota delete_item(): freeing %u, id=%u type=%c",
quota_cut_bytes, inode->i_uid, head2type(&s_ih));
#endif
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_free_space_nodirty(inode, quota_cut_bytes);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
/* Return deleted body length */
return ret_value;
@@ -1325,6 +1328,7 @@ int reiserfs_delete_item(struct reiserfs
void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
struct inode *inode, struct reiserfs_key *key)
{
+ struct super_block *sb = th->t_super;
struct tree_balance tb;
INITIALIZE_PATH(path);
int item_len = 0;
@@ -1377,14 +1381,17 @@ void reiserfs_delete_solid_item(struct r
if (retval == CARRY_ON) {
do_balance(&tb, NULL, NULL, M_DELETE);
if (inode) { /* Should we count quota for item? (we don't count quotas for save-links) */
+ int depth;
#ifdef REISERQUOTA_DEBUG
reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
"reiserquota delete_solid_item(): freeing %u id=%u type=%c",
quota_cut_bytes, inode->i_uid,
key2type(key));
#endif
+ depth = reiserfs_write_unlock_nested(sb);
dquot_free_space_nodirty(inode,
quota_cut_bytes);
+ reiserfs_write_lock_nested(sb, depth);
}
break;
}
@@ -1561,6 +1568,7 @@ int reiserfs_cut_from_item(struct reiser
int retval2 = -1;
int quota_cut_bytes;
loff_t tail_pos = 0;
+ int depth;
BUG_ON(!th->t_trans_id);
@@ -1733,7 +1741,9 @@ int reiserfs_cut_from_item(struct reiser
"reiserquota cut_from_item(): freeing %u id=%u type=%c",
quota_cut_bytes, inode->i_uid, '?');
#endif
+ depth = reiserfs_write_unlock_nested(sb);
dquot_free_space_nodirty(inode, quota_cut_bytes);
+ reiserfs_write_lock_nested(sb, depth);
return ret_value;
}
@@ -1953,9 +1963,11 @@ int reiserfs_paste_into_item(struct reis
const char *body, /* Pointer to the bytes to paste. */
int pasted_size)
{ /* Size of pasted bytes. */
+ struct super_block *sb = inode->i_sb;
struct tree_balance s_paste_balance;
int retval;
int fs_gen;
+ int depth;
BUG_ON(!th->t_trans_id);
@@ -1968,9 +1980,9 @@ int reiserfs_paste_into_item(struct reis
key2type(&(key->on_disk_key)));
#endif
- reiserfs_write_unlock(inode->i_sb);
+ depth = reiserfs_write_unlock_nested(sb);
retval = dquot_alloc_space_nodirty(inode, pasted_size);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(sb, depth);
if (retval) {
pathrelse(search_path);
return retval;
@@ -2027,7 +2039,9 @@ int reiserfs_paste_into_item(struct reis
pasted_size, inode->i_uid,
key2type(&(key->on_disk_key)));
#endif
+ depth = reiserfs_write_unlock_nested(sb);
dquot_free_space_nodirty(inode, pasted_size);
+ reiserfs_write_lock_nested(sb, depth);
return retval;
}
@@ -2050,6 +2064,7 @@ int reiserfs_insert_item(struct reiserfs
BUG_ON(!th->t_trans_id);
if (inode) { /* Do we count quotas for item? */
+ int depth;
fs_gen = get_generation(inode->i_sb);
quota_bytes = ih_item_len(ih);
@@ -2063,11 +2078,11 @@ int reiserfs_insert_item(struct reiserfs
"reiserquota insert_item(): allocating %u id=%u type=%c",
quota_bytes, inode->i_uid, head2type(ih));
#endif
- reiserfs_write_unlock(inode->i_sb);
/* We can't dirty inode here. It would be immediately written but
* appropriate stat item isn't inserted yet... */
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
retval = dquot_alloc_space_nodirty(inode, quota_bytes);
- reiserfs_write_lock(inode->i_sb);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
if (retval) {
pathrelse(path);
return retval;
@@ -2118,7 +2133,10 @@ int reiserfs_insert_item(struct reiserfs
"reiserquota insert_item(): freeing %u id=%u type=%c",
quota_bytes, inode->i_uid, head2type(ih));
#endif
- if (inode)
+ if (inode) {
+ int depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_free_space_nodirty(inode, quota_bytes);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
+ }
return retval;
}
--- a/fs/reiserfs/super.c 2013-08-07 10:23:34.049585066 -0400
+++ b/fs/reiserfs/super.c 2013-08-07 10:23:35.805558422 -0400
@@ -243,6 +243,7 @@ static int finish_unfinished(struct supe
done = 0;
REISERFS_SB(s)->s_is_unlinked_ok = 1;
while (!retval) {
+ int depth;
retval = search_item(s, &max_cpu_key, &path);
if (retval != ITEM_NOT_FOUND) {
reiserfs_error(s, "vs-2140",
@@ -298,9 +299,9 @@ static int finish_unfinished(struct supe
retval = remove_save_link_only(s, &save_link_key, 0);
continue;
}
- reiserfs_write_unlock(s);
+ depth = reiserfs_write_unlock_nested(inode->i_sb);
dquot_initialize(inode);
- reiserfs_write_lock(s);
+ reiserfs_write_lock_nested(inode->i_sb, depth);
if (truncate && S_ISDIR(inode->i_mode)) {
/* We got a truncate request for a dir which is impossible.
@@ -356,10 +357,12 @@ static int finish_unfinished(struct supe
#ifdef CONFIG_QUOTA
/* Turn quotas off */
+ reiserfs_write_unlock(s);
for (i = 0; i < MAXQUOTAS; i++) {
if (sb_dqopt(s)->files[i] && quota_enabled[i])
dquot_quota_off(s, i);
}
+ reiserfs_write_lock(s);
if (ms_active_set)
/* Restore the flag back */
s->s_flags &= ~MS_ACTIVE;
@@ -2098,6 +2101,7 @@ static int reiserfs_write_dquot(struct d
{
struct reiserfs_transaction_handle th;
int ret, err;
+ int depth;
reiserfs_write_lock(dquot->dq_sb);
ret =
@@ -2105,9 +2109,9 @@ static int reiserfs_write_dquot(struct d
REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
if (ret)
goto out;
- reiserfs_write_unlock(dquot->dq_sb);
+ depth = reiserfs_write_unlock_nested(dquot->dq_sb);
ret = dquot_commit(dquot);
- reiserfs_write_lock(dquot->dq_sb);
+ reiserfs_write_lock_nested(dquot->dq_sb, depth);
err =
journal_end(&th, dquot->dq_sb,
REISERFS_QUOTA_TRANS_BLOCKS(dquot->dq_sb));
@@ -2122,6 +2126,7 @@ static int reiserfs_acquire_dquot(struct
{
struct reiserfs_transaction_handle th;
int ret, err;
+ int depth;
reiserfs_write_lock(dquot->dq_sb);
ret =
@@ -2129,9 +2134,9 @@ static int reiserfs_acquire_dquot(struct
REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
if (ret)
goto out;
- reiserfs_write_unlock(dquot->dq_sb);
+ depth = reiserfs_write_unlock_nested(dquot->dq_sb);
ret = dquot_acquire(dquot);
- reiserfs_write_lock(dquot->dq_sb);
+ reiserfs_write_lock_nested(dquot->dq_sb, depth);
err =
journal_end(&th, dquot->dq_sb,
REISERFS_QUOTA_INIT_BLOCKS(dquot->dq_sb));
@@ -2184,15 +2189,16 @@ static int reiserfs_write_info(struct su
{
struct reiserfs_transaction_handle th;
int ret, err;
+ int depth;
/* Data block + inode block */
reiserfs_write_lock(sb);
ret = journal_begin(&th, sb, 2);
if (ret)
goto out;
- reiserfs_write_unlock(sb);
+ depth = reiserfs_write_unlock_nested(sb);
ret = dquot_commit_info(sb, type);
- reiserfs_write_lock(sb);
+ reiserfs_write_lock_nested(sb, depth);
err = journal_end(&th, sb, 2);
if (!ret && err)
ret = err;
next prev parent reply other threads:[~2013-08-07 16:35 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-07 16:35 [patch v3 0/3] reiserfs locking patchset v3 Jeff Mahoney
2013-08-07 16:35 ` [patch v3 1/3] reiserfs: locking, push write lock out of xattr code Jeff Mahoney
2013-08-07 20:29 ` Jan Kara
2013-08-07 16:35 ` [patch v3 2/3] reiserfs: locking, handle nested locks properly Jeff Mahoney
2013-08-07 20:25 ` Jan Kara
2013-08-08 21:30 ` Jeff Mahoney
2013-08-07 16:35 ` Jeff Mahoney [this message]
2013-08-07 20:28 ` [patch v3 3/3] reiserfs: locking, release lock around quota operations Jan Kara
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