Commit c83617db authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Theodore Ts'o
Browse files

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: [<c01cf665>] ext4_release_file+0x23/0x66
Pid: 2426, comm: vi Not tainted 2.6.25-rc7 #24
[<c011a3dc>] __might_sleep+0xbe/0xc5
[<c01620c9>] kmem_cache_alloc+0x22/0xa6
[<c01e382a>] ext4_mb_release_inode_pa+0x73/0x1b3
[<c01e6adf>] ext4_mb_discard_inode_preallocations+0x22d/0x2d4
[<c013000a>] ? param_set_ushort+0x32/0x39
[<c01ceba1>] ext4_discard_reservation+0x27/0x6a
[<c01cf66c>] ext4_release_file+0x2a/0x66
[<c0165bd6>] __fput+0xae/0x155
[<c0165e46>] fput+0x17/0x19
[<c0163756>] filp_close+0x50/0x5a
[<c01647c0>] sys_close+0x71/0xad
[<c0104aba>] sysenter_past_esp+0x5f/0xa5

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatarMingming Cao <cmm@us.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 3dcf5451

fs/ext4/mballoc.c

+15 −14
Original line number Diff line number Diff line
@@ -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);

}



/*

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