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Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/direct.c59
1 files changed, 29 insertions, 30 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index b4bbf6d7592..58830429e42 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -59,7 +59,6 @@
#define NFSDBG_FACILITY NFSDBG_VFS
-static void nfs_free_user_pages(struct page **pages, int npages, int do_dirty);
static kmem_cache_t *nfs_direct_cachep;
/*
@@ -121,6 +120,18 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_
return -EINVAL;
}
+static void nfs_free_user_pages(struct page **pages, int npages, int do_dirty)
+{
+ int i;
+ for (i = 0; i < npages; i++) {
+ struct page *page = pages[i];
+ if (do_dirty && !PageCompound(page))
+ set_page_dirty_lock(page);
+ page_cache_release(page);
+ }
+ kfree(pages);
+}
+
static inline int nfs_get_user_pages(int rw, unsigned long user_addr, size_t size, struct page ***pages)
{
int result = -ENOMEM;
@@ -138,31 +149,23 @@ static inline int nfs_get_user_pages(int rw, unsigned long user_addr, size_t siz
page_count, (rw == READ), 0,
*pages, NULL);
up_read(&current->mm->mmap_sem);
- /*
- * If we got fewer pages than expected from get_user_pages(),
- * the user buffer runs off the end of a mapping; return EFAULT.
- */
- if (result >= 0 && result < page_count) {
- nfs_free_user_pages(*pages, result, 0);
+ if (result != page_count) {
+ /*
+ * If we got fewer pages than expected from
+ * get_user_pages(), the user buffer runs off the
+ * end of a mapping; return EFAULT.
+ */
+ if (result >= 0) {
+ nfs_free_user_pages(*pages, result, 0);
+ result = -EFAULT;
+ } else
+ kfree(*pages);
*pages = NULL;
- result = -EFAULT;
}
}
return result;
}
-static void nfs_free_user_pages(struct page **pages, int npages, int do_dirty)
-{
- int i;
- for (i = 0; i < npages; i++) {
- struct page *page = pages[i];
- if (do_dirty && !PageCompound(page))
- set_page_dirty_lock(page);
- page_cache_release(page);
- }
- kfree(pages);
-}
-
static inline struct nfs_direct_req *nfs_direct_req_alloc(void)
{
struct nfs_direct_req *dreq;
@@ -788,13 +791,11 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, char __user *buf, size_t count,
if (retval)
goto out;
- page_count = nfs_get_user_pages(READ, (unsigned long) buf,
+ retval = nfs_get_user_pages(READ, (unsigned long) buf,
count, &pages);
- if (page_count < 0) {
- nfs_free_user_pages(pages, 0, 0);
- retval = page_count;
+ if (retval < 0)
goto out;
- }
+ page_count = retval;
retval = nfs_direct_read(iocb, (unsigned long) buf, count, pos,
pages, page_count);
@@ -862,13 +863,11 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const char __user *buf, size_t
if (retval)
goto out;
- page_count = nfs_get_user_pages(WRITE, (unsigned long) buf,
+ retval = nfs_get_user_pages(WRITE, (unsigned long) buf,
count, &pages);
- if (page_count < 0) {
- nfs_free_user_pages(pages, 0, 0);
- retval = page_count;
+ if (retval < 0)
goto out;
- }
+ page_count = retval;
retval = nfs_direct_write(iocb, (unsigned long) buf, count,
pos, pages, page_count);