ext4: cleanup GFP flags inside resize path

We must use GFP_NOFS instead GFP_KERNEL inside ext4_mb_add_groupinfo
and ext4_calculate_overhead() because they are called from inside a
journal transaction. Call trace:

ioctl
 ->ext4_group_add
   ->journal_start
   ->ext4_setup_new_descs
     ->ext4_mb_add_groupinfo -> GFP_KERNEL
   ->ext4_flex_group_add
     ->ext4_update_super
       ->ext4_calculate_overhead  -> GFP_KERNEL
   ->journal_stop

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 004d0ff..f1c25f8 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2385,7 +2385,7 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
        if (group % EXT4_DESC_PER_BLOCK(sb) == 0) {
                metalen = sizeof(*meta_group_info) <<
                        EXT4_DESC_PER_BLOCK_BITS(sb);
-               meta_group_info = kmalloc(metalen, GFP_KERNEL);
+               meta_group_info = kmalloc(metalen, GFP_NOFS);
                if (meta_group_info == NULL) {
                        ext4_msg(sb, KERN_ERR, "can't allocate mem "
                                 "for a buddy group");
@@ -2399,7 +2399,7 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
                sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)];
        i = group & (EXT4_DESC_PER_BLOCK(sb) - 1);
 
-       meta_group_info[i] = kmem_cache_zalloc(cachep, GFP_KERNEL);
+       meta_group_info[i] = kmem_cache_zalloc(cachep, GFP_NOFS);
        if (meta_group_info[i] == NULL) {
                ext4_msg(sb, KERN_ERR, "can't allocate buddy mem");
                goto exit_group_info;
@@ -2428,7 +2428,7 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
        {
                struct buffer_head *bh;
                meta_group_info[i]->bb_bitmap =
-                       kmalloc(sb->s_blocksize, GFP_KERNEL);
+                       kmalloc(sb->s_blocksize, GFP_NOFS);
                BUG_ON(meta_group_info[i]->bb_bitmap == NULL);
                bh = ext4_read_block_bitmap(sb, group);
                BUG_ON(bh == NULL);

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 4831849..b643009 100644 (file)
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3300,7 +3300,7 @@ int ext4_calculate_overhead(struct super_block *sb)
        struct ext4_super_block *es = sbi->s_es;
        ext4_group_t i, ngroups = ext4_get_groups_count(sb);
        ext4_fsblk_t overhead = 0;
-       char *buf = (char *) get_zeroed_page(GFP_KERNEL);
+       char *buf = (char *) get_zeroed_page(GFP_NOFS);
 
        if (!buf)
                return -ENOMEM;