From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Mahoney Subject: [patch v3 3/3] reiserfs: locking, release lock around quota operations Date: Wed, 07 Aug 2013 12:35:18 -0400 Message-ID: <20130807163550.684219995@suse.com> References: <20130807163515.986450231@suse.com> Return-path: Content-Disposition: inline; filename=reiserfs/reiserfs-locking-release-lock-around-quota-operations Sender: reiserfs-devel-owner@vger.kernel.org List-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: reiserfs-devel@vger.kernel.org Cc: jack@suse.cz 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 --- 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;