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authorLinus Torvalds <torvalds@linux-foundation.org>2014-10-18 22:53:51 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-10-18 22:53:51 +0400
commitd3dc366bbaf07c125561e90d6da4bb147741101a (patch)
tree6eb7e79a8ec9df1fa705393c6d15ccea3d104661 /fs/block_dev.c
parent511c41d9e6665a07aca94eb00983cf6d77dd87ff (diff)
parente19a8a0ad2d255316830ead05b59c5a704434cbb (diff)
downloadlinux-d3dc366bbaf07c125561e90d6da4bb147741101a.tar.xz
Merge branch 'for-3.18/core' of git://git.kernel.dk/linux-block
Pull core block layer changes from Jens Axboe: "This is the core block IO pull request for 3.18. Apart from the new and improved flush machinery for blk-mq, this is all mostly bug fixes and cleanups. - blk-mq timeout updates and fixes from Christoph. - Removal of REQ_END, also from Christoph. We pass it through the ->queue_rq() hook for blk-mq instead, freeing up one of the request bits. The space was overly tight on 32-bit, so Martin also killed REQ_KERNEL since it's no longer used. - blk integrity updates and fixes from Martin and Gu Zheng. - Update to the flush machinery for blk-mq from Ming Lei. Now we have a per hardware context flush request, which both cleans up the code should scale better for flush intensive workloads on blk-mq. - Improve the error printing, from Rob Elliott. - Backing device improvements and cleanups from Tejun. - Fixup of a misplaced rq_complete() tracepoint from Hannes. - Make blk_get_request() return error pointers, fixing up issues where we NULL deref when a device goes bad or missing. From Joe Lawrence. - Prep work for drastically reducing the memory consumption of dm devices from Junichi Nomura. This allows creating clone bio sets without preallocating a lot of memory. - Fix a blk-mq hang on certain combinations of queue depths and hardware queues from me. - Limit memory consumption for blk-mq devices for crash dump scenarios and drivers that use crazy high depths (certain SCSI shared tag setups). We now just use a single queue and limited depth for that" * 'for-3.18/core' of git://git.kernel.dk/linux-block: (58 commits) block: Remove REQ_KERNEL blk-mq: allocate cpumask on the home node bio-integrity: remove the needless fail handle of bip_slab creating block: include func name in __get_request prints block: make blk_update_request print prefix match ratelimited prefix blk-merge: don't compute bi_phys_segments from bi_vcnt for cloned bio block: fix alignment_offset math that assumes io_min is a power-of-2 blk-mq: Make bt_clear_tag() easier to read blk-mq: fix potential hang if rolling wakeup depth is too high block: add bioset_create_nobvec() block: use bio_clone_fast() in blk_rq_prep_clone() block: misplaced rq_complete tracepoint sd: Honor block layer integrity handling flags block: Replace strnicmp with strncasecmp block: Add T10 Protection Information functions block: Don't merge requests if integrity flags differ block: Integrity checksum flag block: Relocate bio integrity flags block: Add a disk flag to block integrity profile block: Add prefix to block integrity profile flags ...
Diffstat (limited to 'fs/block_dev.c')
-rw-r--r--fs/block_dev.c34
1 files changed, 11 insertions, 23 deletions
diff --git a/fs/block_dev.c b/fs/block_dev.c
index e2f3ad0879ce..cc9d4114cda0 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -50,32 +50,22 @@ inline struct block_device *I_BDEV(struct inode *inode)
EXPORT_SYMBOL(I_BDEV);
/*
- * Move the inode from its current bdi to a new bdi. If the inode is dirty we
- * need to move it onto the dirty list of @dst so that the inode is always on
- * the right list.
+ * Move the inode from its current bdi to a new bdi. Make sure the inode
+ * is clean before moving so that it doesn't linger on the old bdi.
*/
static void bdev_inode_switch_bdi(struct inode *inode,
struct backing_dev_info *dst)
{
- struct backing_dev_info *old = inode->i_data.backing_dev_info;
- bool wakeup_bdi = false;
-
- if (unlikely(dst == old)) /* deadlock avoidance */
- return;
- bdi_lock_two(&old->wb, &dst->wb);
- spin_lock(&inode->i_lock);
- inode->i_data.backing_dev_info = dst;
- if (inode->i_state & I_DIRTY) {
- if (bdi_cap_writeback_dirty(dst) && !wb_has_dirty_io(&dst->wb))
- wakeup_bdi = true;
- list_move(&inode->i_wb_list, &dst->wb.b_dirty);
+ while (true) {
+ spin_lock(&inode->i_lock);
+ if (!(inode->i_state & I_DIRTY)) {
+ inode->i_data.backing_dev_info = dst;
+ spin_unlock(&inode->i_lock);
+ return;
+ }
+ spin_unlock(&inode->i_lock);
+ WARN_ON_ONCE(write_inode_now(inode, true));
}
- spin_unlock(&inode->i_lock);
- spin_unlock(&old->wb.list_lock);
- spin_unlock(&dst->wb.list_lock);
-
- if (wakeup_bdi)
- bdi_wakeup_thread_delayed(dst);
}
/* Kill _all_ buffers and pagecache , dirty or not.. */
@@ -1179,8 +1169,6 @@ static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part)
if (!ret) {
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9);
bdi = blk_get_backing_dev_info(bdev);
- if (bdi == NULL)
- bdi = &default_backing_dev_info;
bdev_inode_switch_bdi(bdev->bd_inode, bdi);
}