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| author | David S. Miller <davem@davemloft.net> | 2010-05-12 09:05:35 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-12 09:05:35 +0200 |
| commit | 278554bd6579206921f5d8a523649a7a57f8850d (patch) | |
| tree | 4e6c527daf0910e455b3aa72e2c96b0479e430be /mm/backing-dev.c | |
| parent | ar9170: fix for driver-core ABI change (diff) | |
| parent | Merge branch 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/g... (diff) | |
| download | linux-278554bd6579206921f5d8a523649a7a57f8850d.tar.xz linux-278554bd6579206921f5d8a523649a7a57f8850d.zip | |
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
Conflicts:
Documentation/feature-removal-schedule.txt
drivers/net/wireless/ath/ar9170/usb.c
drivers/scsi/iscsi_tcp.c
net/ipv4/ipmr.c
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 f13e067e1467..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; /* @@ -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]) |