fs/affs/file.c: unlock/release page on error

When affs_bread_ino() fails, correctly unlock the page and release the
page cache with proper error value.  All write_end() should
unlock/release the page that was locked by write_beg().

Signed-off-by: Taesoo Kim <tsgatesv@gmail.com>
Cc: Fabian Frederick <fabf@skynet.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/affs/file.c b/fs/affs/file.c
index d2468bf..a91795e 100644 (file)
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -699,8 +699,10 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
        boff = tmp % bsize;
        if (boff) {
                bh = affs_bread_ino(inode, bidx, 0);
-               if (IS_ERR(bh))
-                       return PTR_ERR(bh);
+               if (IS_ERR(bh)) {
+                       written = PTR_ERR(bh);
+                       goto err_first_bh;
+               }
                tmp = min(bsize - boff, to - from);
                BUG_ON(boff + tmp > bsize || tmp > bsize);
                memcpy(AFFS_DATA(bh) + boff, data + from, tmp);
@@ -712,14 +714,16 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
                bidx++;
        } else if (bidx) {
                bh = affs_bread_ino(inode, bidx - 1, 0);
-               if (IS_ERR(bh))
-                       return PTR_ERR(bh);
+               if (IS_ERR(bh)) {
+                       written = PTR_ERR(bh);
+                       goto err_first_bh;
+               }
        }
        while (from + bsize <= to) {
                prev_bh = bh;
                bh = affs_getemptyblk_ino(inode, bidx);
                if (IS_ERR(bh))
-                       goto out;
+                       goto err_bh;
                memcpy(AFFS_DATA(bh), data + from, bsize);
                if (buffer_new(bh)) {
                        AFFS_DATA_HEAD(bh)->ptype = cpu_to_be32(T_DATA);
@@ -751,7 +755,7 @@ static int affs_write_end_ofs(struct file *file, struct address_space *mapping,
                prev_bh = bh;
                bh = affs_bread_ino(inode, bidx, 1);
                if (IS_ERR(bh))
-                       goto out;
+                       goto err_bh;
                tmp = min(bsize, to - from);
                BUG_ON(tmp > bsize);
                memcpy(AFFS_DATA(bh), data + from, tmp);
@@ -790,12 +794,13 @@ done:
        if (tmp > inode->i_size)
                inode->i_size = AFFS_I(inode)->mmu_private = tmp;
 
+err_first_bh:
        unlock_page(page);
        page_cache_release(page);
 
        return written;
 
-out:
+err_bh:
        bh = prev_bh;
        if (!written)
                written = PTR_ERR(bh);