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Subject[PATCH 10/13] reiser4: use zero_user_page
Use zero_user_page() instead of open-coding it.  Also replace the (mostly)
redundant zero_page() function.

Signed-off-by: Nate Diller <nate.diller@gmail.com>

---
diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/reiser4/plugin/file/cryptcompress.c linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/file/cryptcompress.c
--- linux-2.6.21-rc6-mm1/fs/reiser4/plugin/file/cryptcompress.c 2007-04-10 17:15:04.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/file/cryptcompress.c 2007-04-10 18:35:44.000000000 -0700
@@ -1897,7 +1897,6 @@ static int
write_hole(struct inode *inode, reiser4_cluster_t * clust, loff_t file_off,
loff_t to_file)
{
- char *data;
int result = 0;
unsigned cl_off, cl_count = 0;
unsigned to_pg, pg_off;
@@ -1934,10 +1933,7 @@ write_hole(struct inode *inode, reiser4_

to_pg = min_count(PAGE_CACHE_SIZE - pg_off, cl_count);
lock_page(page);
- data = kmap_atomic(page, KM_USER0);
- memset(data + pg_off, 0, to_pg);
- flush_dcache_page(page);
- kunmap_atomic(data, KM_USER0);
+ zero_user_page(page, pg_off, to_pg);
SetPageUptodate(page);
unlock_page(page);

@@ -2167,7 +2163,6 @@ read_some_cluster_pages(struct inode *in

if (clust->nr_pages) {
int off;
- char *data;
struct page * pg;
assert("edward-1419", clust->pages != NULL);
pg = clust->pages[clust->nr_pages - 1];
@@ -2175,10 +2170,7 @@ read_some_cluster_pages(struct inode *in
off = off_to_pgoff(win->off+win->count+win->delta);
if (off) {
lock_page(pg);
- data = kmap_atomic(pg, KM_USER0);
- memset(data + off, 0, PAGE_CACHE_SIZE - off);
- flush_dcache_page(pg);
- kunmap_atomic(data, KM_USER0);
+ zero_user_page(pg, off, PAGE_CACHE_SIZE - off);
unlock_page(pg);
}
}
@@ -2217,20 +2209,15 @@ read_some_cluster_pages(struct inode *in
(count_to_nrpages(inode->i_size) <= pg->index)) {
/* .. and appended,
so set zeroes to the rest */
- char *data;
int offset;
lock_page(pg);
- data = kmap_atomic(pg, KM_USER0);
-
assert("edward-1260",
count_to_nrpages(win->off + win->count +
win->delta) - 1 == i);

offset =
off_to_pgoff(win->off + win->count + win->delta);
- memset(data + offset, 0, PAGE_CACHE_SIZE - offset);
- flush_dcache_page(pg);
- kunmap_atomic(data, KM_USER0);
+ zero_user_page(pg, offset, PAGE_CACHE_SIZE - offset);
unlock_page(pg);
/* still not uptodate */
break;
diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/reiser4/plugin/file/file.c linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/file/file.c
--- linux-2.6.21-rc6-mm1/fs/reiser4/plugin/file/file.c 2007-04-10 17:15:04.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/file/file.c 2007-04-10 18:35:44.000000000 -0700
@@ -433,7 +433,6 @@ static int shorten_file(struct inode *in
struct page *page;
int padd_from;
unsigned long index;
- char *kaddr;
unix_file_info_t *uf_info;

/*
@@ -523,10 +522,7 @@ static int shorten_file(struct inode *in

lock_page(page);
assert("vs-1066", PageLocked(page));
- kaddr = kmap_atomic(page, KM_USER0);
- memset(kaddr + padd_from, 0, PAGE_CACHE_SIZE - padd_from);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_page(page, padd_from, PAGE_CACHE_SIZE - padd_from);
unlock_page(page);
page_cache_release(page);
/* the below does up(sbinfo->delete_mutex). Do not get confused */
diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/reiser4/plugin/item/ctail.c linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/item/ctail.c
--- linux-2.6.21-rc6-mm1/fs/reiser4/plugin/item/ctail.c 2007-04-10 17:15:04.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/item/ctail.c 2007-04-10 18:35:44.000000000 -0700
@@ -627,11 +627,7 @@ int do_readpage_ctail(struct inode * ino
#endif
case FAKE_DISK_CLUSTER:
/* fill the page by zeroes */
- data = kmap_atomic(page, KM_USER0);
-
- memset(data, 0, PAGE_CACHE_SIZE);
- flush_dcache_page(page);
- kunmap_atomic(data, KM_USER0);
+ zero_user_page(page, 0, PAGE_CACHE_SIZE);
SetPageUptodate(page);
break;
case PREP_DISK_CLUSTER:
diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/reiser4/plugin/item/extent_file_ops.c linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/item/extent_file_ops.c
--- linux-2.6.21-rc6-mm1/fs/reiser4/plugin/item/extent_file_ops.c 2007-04-10 18:05:52.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/item/extent_file_ops.c 2007-04-10 18:35:44.000000000 -0700
@@ -1083,17 +1083,6 @@ ssize_t reiser4_write_extent(struct file
return (count - left) ? (count - left) : -EFAULT;
}

-static inline void zero_page(struct page *page)
-{
- char *kaddr = kmap_atomic(page, KM_USER0);
-
- memset(kaddr, 0, PAGE_CACHE_SIZE);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- SetPageUptodate(page);
- unlock_page(page);
-}
-
int reiser4_do_readpage_extent(reiser4_extent * ext, reiser4_block_nr pos,
struct page *page)
{
@@ -1115,7 +1104,9 @@ int reiser4_do_readpage_extent(reiser4_e
*/
j = jfind(mapping, index);
if (j == NULL) {
- zero_page(page);
+ zero_user_page(page, 0, PAGE_CACHE_SIZE);
+ SetPageUptodate(page);
+ unlock_page(page);
return 0;
}
spin_lock_jnode(j);
@@ -1128,7 +1119,9 @@ int reiser4_do_readpage_extent(reiser4_e
block = *jnode_get_io_block(j);
spin_unlock_jnode(j);
if (block == 0) {
- zero_page(page);
+ zero_user_page(page, 0, PAGE_CACHE_SIZE);
+ SetPageUptodate(page);
+ unlock_page(page);
jput(j);
return 0;
}
diff -urpN -X dontdiff linux-2.6.21-rc6-mm1/fs/reiser4/plugin/item/tail.c linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/item/tail.c
--- linux-2.6.21-rc6-mm1/fs/reiser4/plugin/item/tail.c 2007-04-10 17:15:04.000000000 -0700
+++ linux-2.6.21-rc6-mm1-test/fs/reiser4/plugin/item/tail.c 2007-04-10 18:35:44.000000000 -0700
@@ -391,12 +391,8 @@ static int do_readpage_tail(uf_coord_t *
}

done:
- if (mapped != PAGE_CACHE_SIZE) {
- pagedata = kmap_atomic(page, KM_USER0);
- memset(pagedata + mapped, 0, PAGE_CACHE_SIZE - mapped);
- flush_dcache_page(page);
- kunmap_atomic(pagedata, KM_USER0);
- }
+ if (mapped != PAGE_CACHE_SIZE)
+ zero_user_page(page, mapped, PAGE_CACHE_SIZE - mapped);
SetPageUptodate(page);
out_unlock_page:
unlock_page(page);
-
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