ext4: return ENOMEM rather than EIO when find_###_page() fails

Return ENOMEM rather than EIO when find_get_page() fails in
ext4_mb_get_buddy_page_lock() and find_or_create_page() fails in
ext4_mb_load_buddy().

Signed-off-by: Younger Liu <younger.liucn@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index a888cac..73ccbb3 100644 (file)
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -989,7 +989,7 @@ static int ext4_mb_get_buddy_page_lock(struct super_block *sb,
        poff = block % blocks_per_page;
        page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
        if (!page)
-               return -EIO;
+               return -ENOMEM;
        BUG_ON(page->mapping != inode->i_mapping);
        e4b->bd_bitmap_page = page;
        e4b->bd_bitmap = page_address(page) + (poff * sb->s_blocksize);
@@ -1003,7 +1003,7 @@ static int ext4_mb_get_buddy_page_lock(struct super_block *sb,
        pnum = block / blocks_per_page;
        page = find_or_create_page(inode->i_mapping, pnum, GFP_NOFS);
        if (!page)
-               return -EIO;
+               return -ENOMEM;
        BUG_ON(page->mapping != inode->i_mapping);
        e4b->bd_buddy_page = page;
        return 0;
@@ -1168,7 +1168,11 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
                        unlock_page(page);
                }
        }
-       if (page == NULL || !PageUptodate(page)) {
+       if (page == NULL) {
+               ret = -ENOMEM;
+               goto err;
+       }
+       if (!PageUptodate(page)) {
                ret = -EIO;
                goto err;
        }
@@ -1197,7 +1201,11 @@ ext4_mb_load_buddy(struct super_block *sb, ext4_group_t group,
                        unlock_page(page);
                }
        }
-       if (page == NULL || !PageUptodate(page)) {
+       if (page == NULL) {
+               ret = -ENOMEM;
+               goto err;
+       }
+       if (!PageUptodate(page)) {
                ret = -EIO;
                goto err;
        }