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btrfs: fallback to vmalloc in btrfs_compare_tree 

The allocation of node could fail if the memory is too fragmented for a
given node size, practically observed with 64k.

http://article.gmane.org/gmane.comp.file-systems.btrfs/54689

Reported-and-tested-by: Jean-Denis Girard <jd.girard@sysnux.pf>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2016-03-30 16:01:12 +02:00
parent 918c2ee103
commit 8f282f71ea
1 changed files with 8 additions and 4 deletions
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12
fs/btrfs/ctree.c
View File

@ -19,6 +19,7 @@
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/rbtree.h>
#include <linux/vmalloc.h>
#include "ctree.h"
#include "disk-io.h"
#include "transaction.h"
@ -5361,10 +5362,13 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
goto out;
}
tmp_buf = kmalloc(left_root->nodesize, GFP_KERNEL);
tmp_buf = kmalloc(left_root->nodesize, GFP_KERNEL | __GFP_NOWARN);
if (!tmp_buf) {
ret = -ENOMEM;
goto out;
tmp_buf = vmalloc(left_root->nodesize);
if (!tmp_buf) {
ret = -ENOMEM;
goto out;
}
}
left_path->search_commit_root = 1;
@ -5565,7 +5569,7 @@ int btrfs_compare_trees(struct btrfs_root *left_root,
out:
btrfs_free_path(left_path);
btrfs_free_path(right_path);
kfree(tmp_buf);
kvfree(tmp_buf);
return ret;
}