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| author | Ingo Molnar <mingo@elte.hu> | 2010-04-30 09:56:41 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-04-30 09:56:44 +0200 |
| commit | 3ca50496c2677a2b3fdd3ede86660fd1433beac6 (patch) | |
| tree | 97a76d8479a8d8a96e04ed0694b8dbf89457bfcc /mm/backing-dev.c | |
| parent | 462b04e28a7ec1339c892117c3f20a40e55d0e83 (diff) | |
| parent | 66f41d4c5c8a5deed66fdcc84509376c9a0bf9d8 (diff) | |
| download | kernel_samsung_crespo-3ca50496c2677a2b3fdd3ede86660fd1433beac6.zip kernel_samsung_crespo-3ca50496c2677a2b3fdd3ede86660fd1433beac6.tar.gz kernel_samsung_crespo-3ca50496c2677a2b3fdd3ede86660fd1433beac6.tar.bz2 | |
Merge commit 'v2.6.34-rc6' into perf/core
Merge reason: update to the latest -rc.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index f13e067..707d0dc 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -11,6 +11,8 @@ #include <linux/writeback.h> #include <linux/device.h> +static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); + void default_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) { } @@ -25,6 +27,11 @@ struct backing_dev_info default_backing_dev_info = { }; EXPORT_SYMBOL_GPL(default_backing_dev_info); +struct backing_dev_info noop_backing_dev_info = { + .name = "noop", +}; +EXPORT_SYMBOL_GPL(noop_backing_dev_info); + static struct class *bdi_class; /* @@ -715,6 +722,33 @@ void bdi_destroy(struct backing_dev_info *bdi) } EXPORT_SYMBOL(bdi_destroy); +/* + * For use from filesystems to quickly init and register a bdi associated + * with dirty writeback + */ +int bdi_setup_and_register(struct backing_dev_info *bdi, char *name, + unsigned int cap) +{ + char tmp[32]; + int err; + + bdi->name = name; + bdi->capabilities = cap; + err = bdi_init(bdi); + if (err) + return err; + + sprintf(tmp, "%.28s%s", name, "-%d"); + err = bdi_register(bdi, NULL, tmp, atomic_long_inc_return(&bdi_seq)); + if (err) { + bdi_destroy(bdi); + return err; + } + + return 0; +} +EXPORT_SYMBOL(bdi_setup_and_register); + static wait_queue_head_t congestion_wqh[2] = { __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[0]), __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1]) |