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GFS2: Fall back to vmalloc if kmalloc fails for dir hash tables

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This version has one more correction: the vmalloc calls are replaced
by __vmalloc calls to preserve the GFP_NOFS flag.

When GFS2's directory management code allocates buffers for a
directory hash table, if it can't get the memory it needs, it
currently gives a bad return code. Rather than giving an error,
this patch allows it to use virtual memory rather than kernel
memory for the hash table. This should make it possible for
directories to function properly, even when kernel memory becomes
very fragmented.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Bob Peterson 2013-05-30 09:48:56 -04:00 committed by Steven Whitehouse
parent 2b3dcf3581
commit e8830d8856
1 changed files with 33 additions and 10 deletions
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43
fs/gfs2/dir.c
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@ -354,22 +354,31 @@ static __be64 *gfs2_dir_get_hash_table(struct gfs2_inode *ip)
return ERR_PTR(-EIO);
}
hc = kmalloc(hsize, GFP_NOFS);
ret = -ENOMEM;
hc = kmalloc(hsize, GFP_NOFS | __GFP_NOWARN);
if (hc == NULL)
hc = __vmalloc(hsize, GFP_NOFS, PAGE_KERNEL);
if (hc == NULL)
return ERR_PTR(-ENOMEM);
ret = gfs2_dir_read_data(ip, hc, hsize);
if (ret < 0) {
kfree(hc);
if (is_vmalloc_addr(hc))
vfree(hc);
else
kfree(hc);
return ERR_PTR(ret);
}
spin_lock(&inode->i_lock);
if (ip->i_hash_cache)
kfree(hc);
else
if (ip->i_hash_cache) {
if (is_vmalloc_addr(hc))
vfree(hc);
else
kfree(hc);
} else {
ip->i_hash_cache = hc;
}
spin_unlock(&inode->i_lock);
return ip->i_hash_cache;
@ -385,7 +394,10 @@ void gfs2_dir_hash_inval(struct gfs2_inode *ip)
{
__be64 *hc = ip->i_hash_cache;
ip->i_hash_cache = NULL;
kfree(hc);
if (is_vmalloc_addr(hc))
vfree(hc);
else
kfree(hc);
}
static inline int gfs2_dirent_sentinel(const struct gfs2_dirent *dent)
@ -1113,7 +1125,10 @@ static int dir_double_exhash(struct gfs2_inode *dip)
if (IS_ERR(hc))
return PTR_ERR(hc);
h = hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS);
h = hc2 = kmalloc(hsize_bytes * 2, GFP_NOFS | __GFP_NOWARN);
if (hc2 == NULL)
hc2 = __vmalloc(hsize_bytes * 2, GFP_NOFS, PAGE_KERNEL);
if (!hc2)
return -ENOMEM;
@ -1145,7 +1160,10 @@ static int dir_double_exhash(struct gfs2_inode *dip)
gfs2_dinode_out(dip, dibh->b_data);
brelse(dibh);
out_kfree:
kfree(hc2);
if (is_vmalloc_addr(hc2))
vfree(hc2);
else
kfree(hc2);
return error;
}
@ -1846,6 +1864,8 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
memset(&rlist, 0, sizeof(struct gfs2_rgrp_list));
ht = kzalloc(size, GFP_NOFS);
if (ht == NULL)
ht = vzalloc(size);
if (!ht)
return -ENOMEM;
@ -1933,7 +1953,10 @@ static int leaf_dealloc(struct gfs2_inode *dip, u32 index, u32 len,
gfs2_rlist_free(&rlist);
gfs2_quota_unhold(dip);
out:
kfree(ht);
if (is_vmalloc_addr(ht))
vfree(ht);
else
kfree(ht);
return error;
}