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xfs: fallback to vmalloc for large buffers in xfs_attrlist_by_handle

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Shamelessly copied from dchinner's:
ad650f5b xfs: fallback to vmalloc for large buffers in xfs_attrmulti_attr_get
    
xfsdump uses for a large buffer for extended attributes, which has a
kmalloc'd shadow buffer in the kernel. This can fail after the
system has been running for some time as it is a high order
allocation. Add a fallback to vmalloc so that it doesn't require
contiguous memory and so won't randomly fail while xfsdump is
running.

Signed-off-by: Eric Sandeen <[email protected]>
Reviewed-by: Mark Tinguely <[email protected]>
Signed-off-by: Ben Myers <[email protected]>
This commit is contained in:
Eric Sandeen 2013-04-04 00:05:13 -05:00 • committed by Ben Myers
commit dd700d9452
1 changed files with 10 additions and 4 deletions
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14
fs/xfs/xfs_ioctl.c
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@ -422,9 +422,12 @@ xfs_attrlist_by_handle(
if (IS_ERR(dentry))
return PTR_ERR(dentry);
kbuf = kzalloc(al_hreq.buflen, GFP_KERNEL);
if (!kbuf)
goto out_dput;
kbuf = kmem_zalloc(al_hreq.buflen, KM_SLEEP | KM_MAYFAIL);
if (!kbuf) {
kbuf = kmem_zalloc_large(al_hreq.buflen);
if (!kbuf)
goto out_dput;
}
cursor = (attrlist_cursor_kern_t *)&al_hreq.pos;
error = -xfs_attr_list(XFS_I(dentry->d_inode), kbuf, al_hreq.buflen,
@ -436,7 +439,10 @@ xfs_attrlist_by_handle(
error = -EFAULT;
out_kfree:
kfree(kbuf);
if (is_vmalloc_addr(kbuf))
kmem_free_large(kbuf);
else
kmem_free(kbuf);
out_dput:
dput(dentry);
return error;