Commit 7d82db83 authored Jan 11, 2013 by Jaegeuk Kim

f2fs: add f2fs_balance_fs in several interfaces



The f2fs_balance_fs() is to check the number of free sections and decide whether
it needs to conduct cleaning or not. If there are not enough free sections, the
cleaning job should be started.

In order to control an amount of free sections even under high utilization, f2fs
should call f2fs_balance_fs at all the VFS interfaces that are able to produce
dirty pages.
This patch adds the function calls in the missing interfaces as follows.

1. f2fs_setxattr()
The f2fs_setxattr() produces dirty node pages so that we should call
f2fs_balance_fs() either likewise doing in other VFS interfaces such as
f2fs_lookup(), f2fs_mkdir(), and so on.

2. f2fs_sync_file()
We should guarantee serving free sections for syncing metadata during fsync.
Previously, there is no space check before triggering checkpoint and
sync_node_pages.
Therefore, if a bunch of fsync calls are triggered under 100% of FS utilization,
f2fs is able to be faced with no free sections, resulting in BUG_ON().

3. f2fs_sync_fs()
Before calling write_checkpoint(), we should guarantee that there are minimum
free sections.

4. f2fs_write_inode()
f2fs_write_inode() is also able to produce dirty node pages.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

parent 408e9375

fs/f2fs/file.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -137,6 +137,9 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
		if (ret)
		return ret;

		/* guarantee free sections for fsync */
		f2fs_balance_fs(sbi);

		mutex_lock(&inode->i_mutex);

		if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))

fs/f2fs/inode.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -217,6 +217,9 @@ int f2fs_write_inode(struct inode inode, struct writeback_control wbc)
		inode->i_ino == F2FS_META_INO(sbi))
		return 0;

		if (wbc)
		f2fs_balance_fs(sbi);

		node_page = get_node_page(sbi, inode->i_ino);
		if (IS_ERR(node_page))
		return PTR_ERR(node_page);

fs/f2fs/super.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -137,6 +137,8 @@ int f2fs_sync_fs(struct super_block *sb, int sync)

		if (sync)
		write_checkpoint(sbi, false, false);
		else
		f2fs_balance_fs(sbi);

		return 0;
		}

fs/f2fs/xattr.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -318,6 +318,8 @@ int f2fs_setxattr(struct inode inode, int name_index, const char name,
		if (name_len > 255 \|\| value_len > MAX_VALUE_LEN)
		return -ERANGE;

		f2fs_balance_fs(sbi);

		mutex_lock_op(sbi, NODE_NEW);
		if (!fi->i_xattr_nid) {
		/* Allocate new attribute block */

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