From c83617db76353ff30e825874be2c15c185b95759 Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" Date: Tue, 29 Apr 2008 22:00:47 -0400 Subject: [PATCH] ext4: Don't do GFP_NOFS allocations after taking ext4_lock_group We can't do GFP_NOFS allocation after taking ext4_lock_group BUG: sleeping function called from invalid context at mm/slab.c:3054 in_atomic():1, irqs_disabled():0 1 lock held by vi/2426: #0: (&ei->i_data_sem){----}, at: [] ext4_release_file+0x23/0x66 Pid: 2426, comm: vi Not tainted 2.6.25-rc7 #24 [] __might_sleep+0xbe/0xc5 [] kmem_cache_alloc+0x22/0xa6 [] ext4_mb_release_inode_pa+0x73/0x1b3 [] ext4_mb_discard_inode_preallocations+0x22d/0x2d4 [] ? param_set_ushort+0x32/0x39 [] ext4_discard_reservation+0x27/0x6a [] ext4_release_file+0x2a/0x66 [] __fput+0xae/0x155 [] fput+0x17/0x19 [] filp_close+0x50/0x5a [] sys_close+0x71/0xad [] sysenter_past_esp+0x5f/0xa5 Signed-off-by: Aneesh Kumar K.V Signed-off-by: Mingming Cao Signed-off-by: "Theodore Ts'o" --- fs/ext4/mballoc.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-) diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index f87471de3af7..d2f0b9661fb9 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -3730,9 +3730,9 @@ static int ext4_mb_new_preallocation(struct ext4_allocation_context *ac) */ static noinline_for_stack int ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh, - struct ext4_prealloc_space *pa) + struct ext4_prealloc_space *pa, + struct ext4_allocation_context *ac) { - struct ext4_allocation_context *ac; struct super_block *sb = e4b->bd_sb; struct ext4_sb_info *sbi = EXT4_SB(sb); unsigned long end; @@ -3748,8 +3748,6 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh, BUG_ON(group != e4b->bd_group && pa->pa_len != 0); end = bit + pa->pa_len; - ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS); - if (ac) { ac->ac_sb = sb; ac->ac_inode = pa->pa_inode; @@ -3794,23 +3792,19 @@ ext4_mb_release_inode_pa(struct ext4_buddy *e4b, struct buffer_head *bitmap_bh, */ } atomic_add(free, &sbi->s_mb_discarded); - if (ac) - kmem_cache_free(ext4_ac_cachep, ac); return err; } static noinline_for_stack int ext4_mb_release_group_pa(struct ext4_buddy *e4b, - struct ext4_prealloc_space *pa) + struct ext4_prealloc_space *pa, + struct ext4_allocation_context *ac) { - struct ext4_allocation_context *ac; struct super_block *sb = e4b->bd_sb; ext4_group_t group; ext4_grpblk_t bit; - ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS); - if (ac) ac->ac_op = EXT4_MB_HISTORY_DISCARD; @@ -3828,7 +3822,6 @@ ext4_mb_release_group_pa(struct ext4_buddy *e4b, ac->ac_b_ex.fe_len = pa->pa_len; ac->ac_b_ex.fe_logical = 0; ext4_mb_store_history(ac); - kmem_cache_free(ext4_ac_cachep, ac); } return 0; @@ -3850,6 +3843,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb, struct ext4_group_info *grp = ext4_get_group_info(sb, group); struct buffer_head *bitmap_bh = NULL; struct ext4_prealloc_space *pa, *tmp; + struct ext4_allocation_context *ac; struct list_head list; struct ext4_buddy e4b; int err; @@ -3877,6 +3871,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb, grp = ext4_get_group_info(sb, group); INIT_LIST_HEAD(&list); + ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS); repeat: ext4_lock_group(sb, group); list_for_each_entry_safe(pa, tmp, @@ -3931,9 +3926,9 @@ repeat: spin_unlock(pa->pa_obj_lock); if (pa->pa_linear) - ext4_mb_release_group_pa(&e4b, pa); + ext4_mb_release_group_pa(&e4b, pa, ac); else - ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); + ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa, ac); list_del(&pa->u.pa_tmp_list); call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); @@ -3941,6 +3936,8 @@ repeat: out: ext4_unlock_group(sb, group); + if (ac) + kmem_cache_free(ext4_ac_cachep, ac); ext4_mb_release_desc(&e4b); put_bh(bitmap_bh); return free; @@ -3961,6 +3958,7 @@ void ext4_mb_discard_inode_preallocations(struct inode *inode) struct super_block *sb = inode->i_sb; struct buffer_head *bitmap_bh = NULL; struct ext4_prealloc_space *pa, *tmp; + struct ext4_allocation_context *ac; ext4_group_t group = 0; struct list_head list; struct ext4_buddy e4b; @@ -3975,6 +3973,7 @@ void ext4_mb_discard_inode_preallocations(struct inode *inode) INIT_LIST_HEAD(&list); + ac = kmem_cache_alloc(ext4_ac_cachep, GFP_NOFS); repeat: /* first, collect all pa's in the inode */ spin_lock(&ei->i_prealloc_lock); @@ -4039,7 +4038,7 @@ repeat: ext4_lock_group(sb, group); list_del(&pa->pa_group_list); - ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa); + ext4_mb_release_inode_pa(&e4b, bitmap_bh, pa, ac); ext4_unlock_group(sb, group); ext4_mb_release_desc(&e4b); @@ -4048,6 +4047,8 @@ repeat: list_del(&pa->u.pa_tmp_list); call_rcu(&(pa)->u.pa_rcu, ext4_mb_pa_callback); } + if (ac) + kmem_cache_free(ext4_ac_cachep, ac); } /* -- 2.20.1