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    Subject[PATCH 08/10] writeback: add name to backing_dev_info
    Date
    This enables us to track who does what and print info. Its main use
    is catching dirty inodes on the default_backing_dev_info, so we can
    fix that up.

    Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
    ---
    block/blk-core.c | 1 +
    drivers/block/aoe/aoeblk.c | 1 +
    drivers/char/mem.c | 1 +
    fs/btrfs/disk-io.c | 1 +
    fs/char_dev.c | 1 +
    fs/configfs/inode.c | 1 +
    fs/fuse/inode.c | 1 +
    fs/hugetlbfs/inode.c | 1 +
    fs/nfs/client.c | 1 +
    fs/ocfs2/dlm/dlmfs.c | 1 +
    fs/ramfs/inode.c | 1 +
    fs/sysfs/inode.c | 1 +
    fs/ubifs/super.c | 1 +
    include/linux/backing-dev.h | 2 ++
    kernel/cgroup.c | 1 +
    mm/backing-dev.c | 1 +
    mm/swap_state.c | 1 +
    17 files changed, 18 insertions(+), 0 deletions(-)

    diff --git a/block/blk-core.c b/block/blk-core.c
    index e3299a7..e695634 100644
    --- a/block/blk-core.c
    +++ b/block/blk-core.c
    @@ -501,6 +501,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
    (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
    q->backing_dev_info.state = 0;
    q->backing_dev_info.capabilities = BDI_CAP_MAP_COPY;
    + q->backing_dev_info.name = "block";

    err = bdi_init(&q->backing_dev_info);
    if (err) {
    diff --git a/drivers/block/aoe/aoeblk.c b/drivers/block/aoe/aoeblk.c
    index 2307a27..0efb8fc 100644
    --- a/drivers/block/aoe/aoeblk.c
    +++ b/drivers/block/aoe/aoeblk.c
    @@ -265,6 +265,7 @@ aoeblk_gdalloc(void *vp)
    }

    blk_queue_make_request(&d->blkq, aoeblk_make_request);
    + d->blkq.backing_dev_info.name = "aoe";
    if (bdi_init(&d->blkq.backing_dev_info))
    goto err_mempool;
    spin_lock_irqsave(&d->lock, flags);
    diff --git a/drivers/char/mem.c b/drivers/char/mem.c
    index afa8813..645237b 100644
    --- a/drivers/char/mem.c
    +++ b/drivers/char/mem.c
    @@ -822,6 +822,7 @@ static const struct file_operations zero_fops = {
    * - permits private mappings, "copies" are taken of the source of zeros
    */
    static struct backing_dev_info zero_bdi = {
    + .name = "char/mem",
    .capabilities = BDI_CAP_MAP_COPY,
    };

    diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
    index e83be2e..15831d5 100644
    --- a/fs/btrfs/disk-io.c
    +++ b/fs/btrfs/disk-io.c
    @@ -1352,6 +1352,7 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
    {
    int err;

    + bdi->name = "btrfs";
    bdi->capabilities = BDI_CAP_MAP_COPY;
    err = bdi_init(bdi);
    if (err)
    diff --git a/fs/char_dev.c b/fs/char_dev.c
    index a173551..7c27a8e 100644
    --- a/fs/char_dev.c
    +++ b/fs/char_dev.c
    @@ -31,6 +31,7 @@
    * - no readahead or I/O queue unplugging required
    */
    struct backing_dev_info directly_mappable_cdev_bdi = {
    + .name = "char",
    .capabilities = (
    #ifdef CONFIG_MMU
    /* permit private copies of the data to be taken */
    diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
    index 4921e74..a2f7460 100644
    --- a/fs/configfs/inode.c
    +++ b/fs/configfs/inode.c
    @@ -51,6 +51,7 @@ static const struct address_space_operations configfs_aops = {
    };

    static struct backing_dev_info configfs_backing_dev_info = {
    + .name = "configfs",
    .ra_pages = 0, /* No readahead */
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
    };
    diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
    index f91ccc4..4567db6 100644
    --- a/fs/fuse/inode.c
    +++ b/fs/fuse/inode.c
    @@ -801,6 +801,7 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
    {
    int err;

    + fc->bdi.name = "fuse";
    fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
    fc->bdi.unplug_io_fn = default_unplug_io_fn;
    /* fuse does it's own writeback accounting */
    diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
    index cb88dac..a93b885 100644
    --- a/fs/hugetlbfs/inode.c
    +++ b/fs/hugetlbfs/inode.c
    @@ -44,6 +44,7 @@ static const struct inode_operations hugetlbfs_dir_inode_operations;
    static const struct inode_operations hugetlbfs_inode_operations;

    static struct backing_dev_info hugetlbfs_backing_dev_info = {
    + .name = "hugetlbfs",
    .ra_pages = 0, /* No readahead */
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
    };
    diff --git a/fs/nfs/client.c b/fs/nfs/client.c
    index 8d25ccb..c6be84a 100644
    --- a/fs/nfs/client.c
    +++ b/fs/nfs/client.c
    @@ -879,6 +879,7 @@ static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *
    server->rsize = NFS_MAX_FILE_IO_SIZE;
    server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

    + server->backing_dev_info.name = "nfs";
    server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;

    if (server->wsize > max_rpc_payload)
    diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c
    index 1c9efb4..02bf178 100644
    --- a/fs/ocfs2/dlm/dlmfs.c
    +++ b/fs/ocfs2/dlm/dlmfs.c
    @@ -325,6 +325,7 @@ clear_fields:
    }

    static struct backing_dev_info dlmfs_backing_dev_info = {
    + .name = "ocfs2-dlmfs",
    .ra_pages = 0, /* No readahead */
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
    };
    diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
    index 0ff7566..a7f0110 100644
    --- a/fs/ramfs/inode.c
    +++ b/fs/ramfs/inode.c
    @@ -46,6 +46,7 @@ static const struct super_operations ramfs_ops;
    static const struct inode_operations ramfs_dir_inode_operations;

    static struct backing_dev_info ramfs_backing_dev_info = {
    + .name = "ramfs",
    .ra_pages = 0, /* No readahead */
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK |
    BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
    diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
    index 555f0ff..e57f98e 100644
    --- a/fs/sysfs/inode.c
    +++ b/fs/sysfs/inode.c
    @@ -29,6 +29,7 @@ static const struct address_space_operations sysfs_aops = {
    };

    static struct backing_dev_info sysfs_backing_dev_info = {
    + .name = "sysfs",
    .ra_pages = 0, /* No readahead */
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
    };
    diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
    index 26d2e0d..3e2bae7 100644
    --- a/fs/ubifs/super.c
    +++ b/fs/ubifs/super.c
    @@ -1971,6 +1971,7 @@ static int ubifs_fill_super(struct super_block *sb, void *data, int silent)
    *
    * Read-ahead will be disabled because @c->bdi.ra_pages is 0.
    */
    + c->bdi.name = "ubifs",
    c->bdi.capabilities = BDI_CAP_MAP_COPY;
    c->bdi.unplug_io_fn = default_unplug_io_fn;
    err = bdi_init(&c->bdi);
    diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
    index 7a23f2f..3e52c98 100644
    --- a/include/linux/backing-dev.h
    +++ b/include/linux/backing-dev.h
    @@ -69,6 +69,8 @@ struct backing_dev_info {
    void (*unplug_io_fn)(struct backing_dev_info *, struct page *);
    void *unplug_io_data;

    + char *name;
    +
    struct percpu_counter bdi_stat[NR_BDI_STAT_ITEMS];

    struct prop_local_percpu completions;
    diff --git a/kernel/cgroup.c b/kernel/cgroup.c
    index b6eadfe..c7ece8f 100644
    --- a/kernel/cgroup.c
    +++ b/kernel/cgroup.c
    @@ -600,6 +600,7 @@ static struct inode_operations cgroup_dir_inode_operations;
    static struct file_operations proc_cgroupstats_operations;

    static struct backing_dev_info cgroup_backing_dev_info = {
    + .name = "cgroup",
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
    };

    diff --git a/mm/backing-dev.c b/mm/backing-dev.c
    index dbaf866..c6a62f4 100644
    --- a/mm/backing-dev.c
    +++ b/mm/backing-dev.c
    @@ -17,6 +17,7 @@ void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page)
    EXPORT_SYMBOL(default_unplug_io_fn);

    struct backing_dev_info default_backing_dev_info = {
    + .name = "default",
    .ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_CACHE_SIZE,
    .state = 0,
    .capabilities = BDI_CAP_MAP_COPY,
    diff --git a/mm/swap_state.c b/mm/swap_state.c
    index 42cd38e..5ae6b8b 100644
    --- a/mm/swap_state.c
    +++ b/mm/swap_state.c
    @@ -34,6 +34,7 @@ static const struct address_space_operations swap_aops = {
    };

    static struct backing_dev_info swap_backing_dev_info = {
    + .name = "swap",
    .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | BDI_CAP_SWAP_BACKED,
    .unplug_io_fn = swap_unplug_io_fn,
    };
    --
    1.6.4.1.207.g68ea


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