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authorLinus Torvalds <torvalds@linux-foundation.org>2010-04-28 07:56:05 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-04-28 07:56:05 -0700
commit970b06485ffee36aa3549dfe4c6b2a2c2118354d (patch)
tree1b0f6f4182e73d19071addf8a209e5fb58483d08 /mm
parent696e65c3606aa3f587eeb181766baf49ea750cfc (diff)
parent33f60e9640b2f60dde6735293d4aa5ecc5b1d5d5 (diff)
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Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block
* 'for-linus' of git://git.kernel.dk/linux-2.6-block: coda: move backing-dev.h kernel include inside __KERNEL__ mtd: ensure that bdi entries are properly initialized and registered Move mtd_bdi_*mappable to mtdcore.c btrfs: convert to using bdi_setup_and_register() Catch filesystems lacking s_bdi drbd: Terminate a connection early if sending the protocol fails drbd: fix memory leak Fix JFFS2 sync silent failure smbfs: add bdi backing to mount session ncpfs: add bdi backing to mount session exofs: add bdi backing to mount session ecryptfs: add bdi backing to mount session coda: add bdi backing to mount session cifs: add bdi backing to mount session afs: add bdi backing to mount session. 9p: add bdi backing to mount session bdi: add helper function for doing init and register of a bdi for a file system block: ensure jiffies wrap is handled correctly in blk_rq_timed_out_timer
Diffstat (limited to 'mm')
-rw-r--r--mm/backing-dev.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index f13e067e146..707d0dc6da0 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])