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    Subject[PATCH 07/18] [PATCH] BLOCK: Remove dependence on existence of blockdev_superblock [try #4]
    Date
    From: David Howells <dhowells@redhat.com>

    Move blockdev_superblock extern declaration from fs/fs-writeback.c to a
    headerfile and remove the dependence on it by wrapping it in a macro.

    Signed-Off-By: David Howells <dhowells@redhat.com>
    ---

    fs/fs-writeback.c | 6 +++---
    fs/internal.h | 2 ++
    2 files changed, 5 insertions(+), 3 deletions(-)

    diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
    index 0639024..c403b66 100644
    --- a/fs/fs-writeback.c
    +++ b/fs/fs-writeback.c
    @@ -319,7 +319,7 @@ sync_sb_inodes(struct super_block *sb, s

    if (!bdi_cap_writeback_dirty(bdi)) {
    list_move(&inode->i_list, &sb->s_dirty);
    - if (sb == blockdev_superblock) {
    + if (sb_is_blkdev_sb(sb)) {
    /*
    * Dirty memory-backed blockdev: the ramdisk
    * driver does this. Skip just this inode
    @@ -336,14 +336,14 @@ sync_sb_inodes(struct super_block *sb, s

    if (wbc->nonblocking && bdi_write_congested(bdi)) {
    wbc->encountered_congestion = 1;
    - if (sb != blockdev_superblock)
    + if (!sb_is_blkdev_sb(sb))
    break; /* Skip a congested fs */
    list_move(&inode->i_list, &sb->s_dirty);
    continue; /* Skip a congested blockdev */
    }

    if (wbc->bdi && bdi != wbc->bdi) {
    - if (sb != blockdev_superblock)
    + if (!sb_is_blkdev_sb(sb))
    break; /* fs has the wrong queue */
    list_move(&inode->i_list, &sb->s_dirty);
    continue; /* blockdev has wrong queue */
    diff --git a/fs/internal.h b/fs/internal.h
    index c21ecd3..f662b70 100644
    --- a/fs/internal.h
    +++ b/fs/internal.h
    @@ -17,6 +17,8 @@ #include <linux/ioctl32.h>
    extern struct super_block *blockdev_superblock;
    extern void __init bdev_cache_init(void);

    +#define sb_is_blkdev_sb(sb) ((sb) == blockdev_superblock)
    +
    /*
    * char_dev.c
    */
    -
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