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linux-sg2042
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kernfs: kvmalloc xattr value instead of kmalloc 

xattr values have a 64k maximum size. This can result in an order 4
kmalloc request which can be difficult to fulfill. Since xattrs do not
need physically contiguous memory, we can switch to kvmalloc and not
have to worry about higher order allocations failing.

Signed-off-by: Daniel Xu <dxu@dxuuu.xyz>
Acked-by: Chris Down <chris@chrisdown.name>
Reviewed-by: Andreas Dilger <adilger@dilger.ca>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Daniel Xu 2020-03-12 13:03:14 -07:00 committed by Tejun Heo
parent e7b20d9796
commit fdc85222d5
1 changed files with 3 additions and 3 deletions
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6
fs/xattr.c
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@ -817,7 +817,7 @@ struct simple_xattr *simple_xattr_alloc(const void *value, size_t size)
if (len < sizeof(*new_xattr))
return NULL;
new_xattr = kmalloc(len, GFP_KERNEL);
new_xattr = kvmalloc(len, GFP_KERNEL);
if (!new_xattr)
return NULL;
@ -882,7 +882,7 @@ int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
new_xattr->name = kstrdup(name, GFP_KERNEL);
if (!new_xattr->name) {
kfree(new_xattr);
kvfree(new_xattr);
return -ENOMEM;
}
}
@ -912,7 +912,7 @@ out:
spin_unlock(&xattrs->lock);
if (xattr) {
kfree(xattr->name);
kfree(xattr);
kvfree(xattr);
}
return err;