aboutsummaryrefslogtreecommitdiffstats
path: root/fs/fs-writeback.c
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2010-10-30 09:05:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-10-30 09:05:48 -0700
commit925d169f5b86fe57e2f5264ea574cce9a89b719d (patch)
tree241d3156b427c6398bd3fc5efa9108635d0e189b /fs/fs-writeback.c
parentcdf01dd5443d0befc8c6a32cb2e3d2f568fd2558 (diff)
parent6418c96107a2b399848bb8cfc6e29f11ca74fb94 (diff)
downloadmrst-s0i3-test-925d169f5b86fe57e2f5264ea574cce9a89b719d.tar.gz
mrst-s0i3-test-925d169f5b86fe57e2f5264ea574cce9a89b719d.tar.xz
mrst-s0i3-test-925d169f5b86fe57e2f5264ea574cce9a89b719d.zip
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable: (39 commits) Btrfs: deal with errors from updating the tree log Btrfs: allow subvol deletion by unprivileged user with -o user_subvol_rm_allowed Btrfs: make SNAP_DESTROY async Btrfs: add SNAP_CREATE_ASYNC ioctl Btrfs: add START_SYNC, WAIT_SYNC ioctls Btrfs: async transaction commit Btrfs: fix deadlock in btrfs_commit_transaction Btrfs: fix lockdep warning on clone ioctl Btrfs: fix clone ioctl where range is adjacent to extent Btrfs: fix delalloc checks in clone ioctl Btrfs: drop unused variable in block_alloc_rsv Btrfs: cleanup warnings from gcc 4.6 (nonbugs) Btrfs: Fix variables set but not read (bugs found by gcc 4.6) Btrfs: Use ERR_CAST helpers Btrfs: use memdup_user helpers Btrfs: fix raid code for removing missing drives Btrfs: Switch the extent buffer rbtree into a radix tree Btrfs: restructure try_release_extent_buffer() Btrfs: use the flusher threads for delalloc throttling Btrfs: tune the chunk allocation to 5% of the FS as metadata ... Fix up trivial conflicts in fs/btrfs/super.c and fs/fs-writeback.c, and remove use of INIT_RCU_HEAD in fs/btrfs/extent_io.c (that init macro was useless and removed in commit 5e8067adfdba: "rcu head remove init")
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c47
1 files changed, 40 insertions, 7 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index f027382b54b..3d06ccc953a 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1081,30 +1081,42 @@ static void wait_sb_inodes(struct super_block *sb)
}
/**
- * writeback_inodes_sb - writeback dirty inodes from given super_block
+ * writeback_inodes_sb_nr - writeback dirty inodes from given super_block
* @sb: the superblock
+ * @nr: the number of pages to write
*
* Start writeback on some inodes on this super_block. No guarantees are made
* on how many (if any) will be written, and this function does not wait
- * for IO completion of submitted IO. The number of pages submitted is
- * returned.
+ * for IO completion of submitted IO.
*/
-void writeback_inodes_sb(struct super_block *sb)
+void writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr)
{
DECLARE_COMPLETION_ONSTACK(done);
struct wb_writeback_work work = {
.sb = sb,
.sync_mode = WB_SYNC_NONE,
.done = &done,
+ .nr_pages = nr,
};
WARN_ON(!rwsem_is_locked(&sb->s_umount));
-
- work.nr_pages = get_nr_dirty_pages();
-
bdi_queue_work(sb->s_bdi, &work);
wait_for_completion(&done);
}
+EXPORT_SYMBOL(writeback_inodes_sb_nr);
+
+/**
+ * writeback_inodes_sb - writeback dirty inodes from given super_block
+ * @sb: the superblock
+ *
+ * Start writeback on some inodes on this super_block. No guarantees are made
+ * on how many (if any) will be written, and this function does not wait
+ * for IO completion of submitted IO.
+ */
+void writeback_inodes_sb(struct super_block *sb)
+{
+ return writeback_inodes_sb_nr(sb, get_nr_dirty_pages());
+}
EXPORT_SYMBOL(writeback_inodes_sb);
/**
@@ -1127,6 +1139,27 @@ int writeback_inodes_sb_if_idle(struct super_block *sb)
EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
/**
+ * writeback_inodes_sb_if_idle - start writeback if none underway
+ * @sb: the superblock
+ * @nr: the number of pages to write
+ *
+ * Invoke writeback_inodes_sb if no writeback is currently underway.
+ * Returns 1 if writeback was started, 0 if not.
+ */
+int writeback_inodes_sb_nr_if_idle(struct super_block *sb,
+ unsigned long nr)
+{
+ if (!writeback_in_progress(sb->s_bdi)) {
+ down_read(&sb->s_umount);
+ writeback_inodes_sb_nr(sb, nr);
+ up_read(&sb->s_umount);
+ return 1;
+ } else
+ return 0;
+}
+EXPORT_SYMBOL(writeback_inodes_sb_nr_if_idle);
+
+/**
* sync_inodes_sb - sync sb inode pages
* @sb: the superblock
*