diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2010-05-10 11:59:37 +0200 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2010-05-10 14:20:42 +0200 |
commit | dbb6be6d5e974c42bbecd183effaa0df69e1dd8b (patch) | |
tree | 5735cb47e70853d057a9881dd0ce44b83e88fa63 /mm/backing-dev.c | |
parent | 6a867a395558a7f882d041783e4cdea6744ca2bf (diff) | |
parent | b57f95a38233a2e73b679bea4a5453a1cc2a1cc9 (diff) |
Merge branch 'linus' into timers/core
Reason: Further posix_cpu_timer patches depend on mainline changes
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r-- | mm/backing-dev.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 0e8ca0347707..707d0dc6da0f 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; /* @@ -227,6 +234,9 @@ static struct device_attribute bdi_dev_attrs[] = { static __init int bdi_class_init(void) { bdi_class = class_create(THIS_MODULE, "bdi"); + if (IS_ERR(bdi_class)) + return PTR_ERR(bdi_class); + bdi_class->dev_attrs = bdi_dev_attrs; bdi_debug_init(); return 0; @@ -712,6 +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]) |