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ext4: handle the rest of ext4_mb_load_buddy() ENOMEM errors 

I've got another report about breaking ext4 by ENOMEM error returned from
ext4_mb_load_buddy() caused by memory shortage in memory cgroup.
This time inside ext4_discard_preallocations().

This patch replaces ext4_error() with ext4_warning() where errors returned
from ext4_mb_load_buddy() are not fatal and handled by caller:
* ext4_mb_discard_group_preallocations() - called before generating ENOSPC,
  we'll try to discard other group or return ENOSPC into user-space.
* ext4_trim_all_free() - just stop trimming and return ENOMEM from ioctl.

Some callers cannot handle errors, thus __GFP_NOFAIL is used for them:
* ext4_discard_preallocations()
* ext4_mb_discard_lg_preallocations()

Fixes: adb7ef600c ("ext4: use __GFP_NOFAIL in ext4_free_blocks()")
Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Konstantin Khlebnikov 2017-05-21 22:35:23 -04:00 committed by Theodore Ts'o
parent 3f1d5bad3f
commit 9651e6b2e2
1 changed files with 14 additions and 9 deletions
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23
fs/ext4/mballoc.c
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@ -3887,7 +3887,8 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
err = ext4_mb_load_buddy(sb, group, &e4b);
if (err) {
ext4_error(sb, "Error loading buddy information for %u", group);
ext4_warning(sb, "Error %d loading buddy information for %u",
err, group);
put_bh(bitmap_bh);
return 0;
}
@ -4044,10 +4045,11 @@ repeat:
BUG_ON(pa->pa_type != MB_INODE_PA);
group = ext4_get_group_number(sb, pa->pa_pstart);
err = ext4_mb_load_buddy(sb, group, &e4b);
err = ext4_mb_load_buddy_gfp(sb, group, &e4b,
GFP_NOFS|__GFP_NOFAIL);
if (err) {
ext4_error(sb, "Error loading buddy information for %u",
group);
ext4_error(sb, "Error %d loading buddy information for %u",
err, group);
continue;
}
@ -4303,11 +4305,14 @@ ext4_mb_discard_lg_preallocations(struct super_block *sb,
spin_unlock(&lg->lg_prealloc_lock);
list_for_each_entry_safe(pa, tmp, &discard_list, u.pa_tmp_list) {
int err;
group = ext4_get_group_number(sb, pa->pa_pstart);
if (ext4_mb_load_buddy(sb, group, &e4b)) {
ext4_error(sb, "Error loading buddy information for %u",
group);
err = ext4_mb_load_buddy_gfp(sb, group, &e4b,
GFP_NOFS|__GFP_NOFAIL);
if (err) {
ext4_error(sb, "Error %d loading buddy information for %u",
err, group);
continue;
}
ext4_lock_group(sb, group);
@ -5127,8 +5132,8 @@ ext4_trim_all_free(struct super_block *sb, ext4_group_t group,
ret = ext4_mb_load_buddy(sb, group, &e4b);
if (ret) {
ext4_error(sb, "Error in loading buddy "
"information for %u", group);
ext4_warning(sb, "Error %d loading buddy information for %u",
ret, group);
return ret;
}
bitmap = e4b.bd_bitmap;