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Subject[PATCH 14/17] reiserfs: convert reiserfs_get_page to read_kmap_page
Replace reiserfs_get_page() and reiserfs_put_page() using the new
read_kmap_page() and put_kmapped_page() calls and their locking variants.
Also, propagate the gfp_mask() deadlock comment to callsites.

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

---
diff -urpN -X dontdiff linux-2.6.21-rc5-mm4/fs/reiserfs/xattr.c linux-2.6.21-rc5-mm4-test/fs/reiserfs/xattr.c
--- linux-2.6.21-rc5-mm4/fs/reiserfs/xattr.c 2007-04-05 17:14:25.000000000 -0700
+++ linux-2.6.21-rc5-mm4-test/fs/reiserfs/xattr.c 2007-04-06 14:41:34.000000000 -0700
@@ -438,33 +438,6 @@ int xattr_readdir(struct file *file, fil
return res;
}

-/* Internal operations on file data */
-static inline void reiserfs_put_page(struct page *page)
-{
- kunmap(page);
- page_cache_release(page);
-}
-
-static struct page *reiserfs_get_page(struct inode *dir, unsigned long n)
-{
- struct address_space *mapping = dir->i_mapping;
- struct page *page;
- /* We can deadlock if we try to free dentries,
- and an unlink/rmdir has just occured - GFP_NOFS avoids this */
- mapping_set_gfp_mask(mapping, GFP_NOFS);
- page = read_mapping_page(mapping, n, NULL);
- if (!IS_ERR(page)) {
- kmap(page);
- if (PageError(page))
- goto fail;
- }
- return page;
-
- fail:
- reiserfs_put_page(page);
- return ERR_PTR(-EIO);
-}
-
static inline __u32 xattr_hash(const char *msg, int len)
{
return csum_partial(msg, len, 0);
@@ -537,13 +510,15 @@ reiserfs_xattr_set(struct inode *inode,
else
chunk = buffer_size - buffer_pos;

- page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT);
+ /* We can deadlock if we try to free dentries,
+ and an unlink/rmdir has just occured - GFP_NOFS avoids this */
+ mapping_set_gfp_mask(mapping, GFP_NOFS);
+ page = __read_kmap_page(mapping, file_pos >> PAGE_CACHE_SHIFT);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto out_filp;
}

- lock_page(page);
data = page_address(page);

if (file_pos == 0) {
@@ -566,8 +541,7 @@ reiserfs_xattr_set(struct inode *inode,
page_offset + chunk +
skip);
}
- unlock_page(page);
- reiserfs_put_page(page);
+ put_locked_page(page);
buffer_pos += chunk;
file_pos += chunk;
skip = 0;
@@ -646,13 +620,15 @@ reiserfs_xattr_get(const struct inode *i
else
chunk = isize - file_pos;

- page = reiserfs_get_page(xinode, file_pos >> PAGE_CACHE_SHIFT);
+ /* We can deadlock if we try to free dentries,
+ and an unlink/rmdir has just occured - GFP_NOFS avoids this */
+ mapping_set_gfp_mask(xinode->i_mapping, GFP_NOFS);
+ page = __read_kmap_page(xinode->i_mapping, file_pos >> PAGE_CACHE_SHIFT);
if (IS_ERR(page)) {
err = PTR_ERR(page);
goto out_dput;
}

- lock_page(page);
data = page_address(page);
if (file_pos == 0) {
struct reiserfs_xattr_header *rxh =
@@ -661,8 +637,7 @@ reiserfs_xattr_get(const struct inode *i
chunk -= skip;
/* Magic doesn't match up.. */
if (rxh->h_magic != cpu_to_le32(REISERFS_XATTR_MAGIC)) {
- unlock_page(page);
- reiserfs_put_page(page);
+ put_locked_page(page);
reiserfs_warning(inode->i_sb,
"Invalid magic for xattr (%s) "
"associated with %k", name,
@@ -673,8 +648,7 @@ reiserfs_xattr_get(const struct inode *i
hash = le32_to_cpu(rxh->h_hash);
}
memcpy(buffer + buffer_pos, data + skip, chunk);
- unlock_page(page);
- reiserfs_put_page(page);
+ put_locked_page(page);
file_pos += chunk;
buffer_pos += chunk;
skip = 0;
-
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