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| author | Alan Jenkins <alan-jenkins@tuffmail.co.uk> | 2009-07-29 21:07:55 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rjw@sisk.pl> | 2009-07-29 21:07:55 +0200 |
| commit | dddac6a7b445de95515f64fdf82fe5dc36c02f26 (patch) | |
| tree | 39651610292d6b0c17f210f253a0dd16b022727d /include | |
| parent | ec79be26875f6c1468784876cb99192b7f41c7a5 (diff) | |
| download | linux-dddac6a7b445de95515f64fdf82fe5dc36c02f26.tar.gz linux-dddac6a7b445de95515f64fdf82fe5dc36c02f26.tar.bz2 linux-dddac6a7b445de95515f64fdf82fe5dc36c02f26.zip | |
PM / Hibernate: Replace bdget call with simple atomic_inc of i_count
Create bdgrab(). This function copies an existing reference to a
block_device. It is safe to call from any context.
Hibernation code wishes to copy a reference to the active swap device.
Right now it calls bdget() under a spinlock, but this is wrong because
bdget() can sleep. It doesn't need a full bdget() because we already
hold a reference to active swap devices (and the spinlock protects
against swapoff).
Fixes http://bugzilla.kernel.org/show_bug.cgi?id=13827
Signed-off-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/fs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h index 0872372184fe..a36ffa5a77a4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -1946,6 +1946,7 @@ extern void putname(const char *name); extern int register_blkdev(unsigned int, const char *); extern void unregister_blkdev(unsigned int, const char *); extern struct block_device *bdget(dev_t); +extern struct block_device *bdgrab(struct block_device *bdev); extern void bd_set_size(struct block_device *, loff_t size); extern void bd_forget(struct inode *inode); extern void bdput(struct block_device *); |