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Subject[PATCH 1/8] writeback: get rid of generic_sync_sb_inodes() export
Date
This adds two new exported functions:

- sync_inodes_sb(), which writes out dirty inodes on a super_block, and
- sync_inodes_sb_wait(), which does the same but also waits for IO
completion.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
---
drivers/staging/pohmelfs/inode.c | 9 +----
fs/fs-writeback.c | 68 ++++++++++++++++++++++---------------
fs/sync.c | 8 +++--
fs/ubifs/budget.c | 16 +--------
fs/ubifs/super.c | 8 +----
include/linux/fs.h | 2 -
include/linux/writeback.h | 3 +-
7 files changed, 51 insertions(+), 63 deletions(-)
diff --git a/drivers/staging/pohmelfs/inode.c b/drivers/staging/pohmelfs/inode.c
index 7b60579..bb6db36 100644
--- a/drivers/staging/pohmelfs/inode.c
+++ b/drivers/staging/pohmelfs/inode.c
@@ -1950,14 +1950,7 @@ static int pohmelfs_get_sb(struct file_system_type *fs_type,
*/
static void pohmelfs_kill_super(struct super_block *sb)
{
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_ALL,
- .range_start = 0,
- .range_end = LLONG_MAX,
- .nr_to_write = LONG_MAX,
- };
- generic_sync_sb_inodes(sb, &wbc);
-
+ sync_sb_inodes_wait(sb);
kill_anon_super(sb);
}

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index c54226b..382b15c 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -458,8 +458,8 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc)
* on the writer throttling path, and we get decent balancing between many
* throttled threads: we don't want them all piling up on inode_sync_wait.
*/
-void generic_sync_sb_inodes(struct super_block *sb,
- struct writeback_control *wbc)
+static void generic_sync_sb_inodes(struct super_block *sb,
+ struct writeback_control *wbc)
{
const unsigned long start = jiffies; /* livelock avoidance */
int sync = wbc->sync_mode == WB_SYNC_ALL;
@@ -593,13 +593,6 @@ void generic_sync_sb_inodes(struct super_block *sb,

return; /* Leave any unwritten inodes on s_io */
}
-EXPORT_SYMBOL_GPL(generic_sync_sb_inodes);
-
-static void sync_sb_inodes(struct super_block *sb,
- struct writeback_control *wbc)
-{
- generic_sync_sb_inodes(sb, wbc);
-}

/*
* Start writeback of dirty pagecache data against all unlocked inodes.
@@ -640,7 +633,7 @@ restart:
*/
if (down_read_trylock(&sb->s_umount)) {
if (sb->s_root)
- sync_sb_inodes(sb, wbc);
+ generic_sync_sb_inodes(sb, wbc);
up_read(&sb->s_umount);
}
spin_lock(&sb_lock);
@@ -653,35 +646,54 @@ restart:
spin_unlock(&sb_lock);
}

-/*
- * writeback and wait upon the filesystem's dirty inodes. The caller will
- * do this in two passes - one to write, and one to wait.
- *
- * A finite limit is set on the number of pages which will be written.
- * To prevent infinite livelock of sys_sync().
+/**
+ * sync_inodes_sb - sync sb inode pages
+ * @sb: the superblock
*
- * We add in the number of potentially dirty inodes, because each inode write
- * can dirty pagecache in the underlying blockdev.
+ * This function writes dirty inodes belonging to this super_block. It does
+ * not wait for completion of IO.
*/
-void sync_inodes_sb(struct super_block *sb, int wait)
+long sync_inodes_sb(struct super_block *sb)
{
struct writeback_control wbc = {
- .sync_mode = wait ? WB_SYNC_ALL : WB_SYNC_NONE,
+ .sync_mode = WB_SYNC_NONE,
.range_start = 0,
.range_end = LLONG_MAX,
};
+ unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
+ unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
+ long nr_to_write;

- if (!wait) {
- unsigned long nr_dirty = global_page_state(NR_FILE_DIRTY);
- unsigned long nr_unstable = global_page_state(NR_UNSTABLE_NFS);
-
- wbc.nr_to_write = nr_dirty + nr_unstable +
+ nr_to_write = nr_dirty + nr_unstable +
(inodes_stat.nr_inodes - inodes_stat.nr_unused);
- } else
- wbc.nr_to_write = LONG_MAX; /* doesn't actually matter */

- sync_sb_inodes(sb, &wbc);
+ wbc.nr_to_write = nr_to_write;
+ generic_sync_sb_inodes(sb, &wbc);
+ return nr_to_write - wbc.nr_to_write;
+}
+EXPORT_SYMBOL(sync_inodes_sb);
+
+/**
+ * sync_inodes_sb_wait - sync sb inode pages
+ * @sb: the superblock
+ *
+ * This function writes and waits on any dirty inode belonging to this
+ * super_block.
+ */
+long sync_inodes_sb_wait(struct super_block *sb)
+{
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_ALL,
+ .range_start = 0,
+ .range_end = LLONG_MAX,
+ };
+ long nr_to_write = LLONG_MAX; /* doesn't actually matter */
+
+ wbc.nr_to_write = nr_to_write;
+ generic_sync_sb_inodes(sb, &wbc);
+ return nr_to_write - wbc.nr_to_write;
}
+EXPORT_SYMBOL(sync_inodes_sb_wait);

/**
* write_inode_now - write an inode to disk
diff --git a/fs/sync.c b/fs/sync.c
index 3422ba6..431dba2 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -28,11 +28,13 @@
static int __sync_filesystem(struct super_block *sb, int wait)
{
/* Avoid doing twice syncing and cache pruning for quota sync */
- if (!wait)
+ if (!wait) {
writeout_quota_sb(sb, -1);
- else
+ sync_inodes_sb(sb);
+ } else {
sync_quota_sb(sb, -1);
- sync_inodes_sb(sb, wait);
+ sync_inodes_sb_wait(sb);
+ }
if (sb->s_op->sync_fs)
sb->s_op->sync_fs(sb, wait);
return __sync_blockdev(sb->s_bdev, wait);
diff --git a/fs/ubifs/budget.c b/fs/ubifs/budget.c
index eaf6d89..341edd1 100644
--- a/fs/ubifs/budget.c
+++ b/fs/ubifs/budget.c
@@ -65,26 +65,14 @@
static int shrink_liability(struct ubifs_info *c, int nr_to_write)
{
int nr_written;
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_NONE,
- .range_end = LLONG_MAX,
- .nr_to_write = nr_to_write,
- };
-
- generic_sync_sb_inodes(c->vfs_sb, &wbc);
- nr_written = nr_to_write - wbc.nr_to_write;

+ nr_written = sync_inodes_sb(c->vfs_sb);
if (!nr_written) {
/*
* Re-try again but wait on pages/inodes which are being
* written-back concurrently (e.g., by pdflush).
*/
- memset(&wbc, 0, sizeof(struct writeback_control));
- wbc.sync_mode = WB_SYNC_ALL;
- wbc.range_end = LLONG_MAX;
- wbc.nr_to_write = nr_to_write;
- generic_sync_sb_inodes(c->vfs_sb, &wbc);
- nr_written = nr_to_write - wbc.nr_to_write;
+ nr_written = sync_inodes_sb_wait(c->vfs_sb);
}

dbg_budg("%d pages were written back", nr_written);
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 26d2e0d..0caa3f1 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -438,12 +438,6 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
{
int i, err;
struct ubifs_info *c = sb->s_fs_info;
- struct writeback_control wbc = {
- .sync_mode = WB_SYNC_ALL,
- .range_start = 0,
- .range_end = LLONG_MAX,
- .nr_to_write = LONG_MAX,
- };

/*
* Zero @wait is just an advisory thing to help the file system shove
@@ -462,7 +456,7 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
* the user be able to get more accurate results of 'statfs()' after
* they synchronize the file system.
*/
- generic_sync_sb_inodes(sb, &wbc);
+ sync_inodes_sb_wait(sb);

/*
* Synchronize write buffers, because 'ubifs_run_commit()' does not
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 73e9b64..07b0f66 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2070,8 +2070,6 @@ static inline void invalidate_remote_inode(struct inode *inode)
extern int invalidate_inode_pages2(struct address_space *mapping);
extern int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
-extern void generic_sync_sb_inodes(struct super_block *sb,
- struct writeback_control *wbc);
extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index 3224820..f26a60b 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -78,7 +78,8 @@ struct writeback_control {
*/
void writeback_inodes(struct writeback_control *wbc);
int inode_wait(void *);
-void sync_inodes_sb(struct super_block *, int wait);
+long sync_inodes_sb(struct super_block *);
+long sync_inodes_sb_wait(struct super_block *);

/* writeback.h requires fs.h; it, too, is not included from here. */
static inline void wait_on_inode(struct inode *inode)
--
1.6.4.1.207.g68ea


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