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NFSv4: Fix the acl cache size calculation 

Currently, we do not take into account the size of the 16 byte
struct nfs4_cached_acl header, when deciding whether or not we should
cache the acl data.  Consequently, we will end up allocating an
8k buffer in order to fit a maximum size 4k acl.

This patch adjusts the calculation so that we limit the cache size
to 4k for the acl header+data.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
wifi-calibration
Trond Myklebust 2012-08-14 18:30:41 -04:00
parent 519d3959e3
commit b291f1b1c8
1 changed files with 3 additions and 2 deletions
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5
fs/nfs/nfs4proc.c
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@ -3737,9 +3737,10 @@ out:
static void nfs4_write_cached_acl(struct inode *inode, struct page **pages, size_t pgbase, size_t acl_len)
{
struct nfs4_cached_acl *acl;
size_t buflen = sizeof(*acl) + acl_len;
if (pages && acl_len <= PAGE_SIZE) {
acl = kmalloc(sizeof(*acl) + acl_len, GFP_KERNEL);
if (pages && buflen <= PAGE_SIZE) {
acl = kmalloc(buflen, GFP_KERNEL);
if (acl == NULL)
goto out;
acl->cached = 1;