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Subject[PATCH 07/16] vfs: Introduce new helpers for syncing after writing to O_SYNC file or IS_SYNC inode
Date
Introduce new function for generic inode syncing (vfs_fsync_range) and use
it from fsync() path. Introduce also new helper for syncing after a sync
write (generic_write_sync) using the generic function.

Use these new helpers for syncing from generic VFS functions. This makes
O_SYNC writes to block devices acquire i_mutex for syncing. If we really
care about this, we can make block_fsync() drop the i_mutex and reacquire
it before it returns.

CC: Evgeniy Polyakov <zbr@ioremap.net>
CC: ocfs2-devel@oss.oracle.com
CC: Joel Becker <joel.becker@oracle.com>
CC: Felix Blyakher <felixb@sgi.com>
CC: xfs@oss.sgi.com
CC: Anton Altaparmakov <aia21@cantab.net>
CC: linux-ntfs-dev@lists.sourceforge.net
CC: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
CC: linux-ext4@vger.kernel.org
CC: tytso@mit.edu
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/splice.c | 22 +++++---------------
fs/sync.c | 55 +++++++++++++++++++++++++++++++++++++++++++++------
include/linux/fs.h | 3 ++
mm/filemap.c | 18 +++++-----------
4 files changed, 63 insertions(+), 35 deletions(-)
diff --git a/fs/splice.c b/fs/splice.c
index 73766d2..8190237 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -976,25 +976,15 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,

if (ret > 0) {
unsigned long nr_pages;
+ int err;

- *ppos += ret;
nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;

- /*
- * If file or inode is SYNC and we actually wrote some data,
- * sync it.
- */
- if (unlikely((out->f_flags & O_SYNC) || IS_SYNC(inode))) {
- int err;
-
- mutex_lock(&inode->i_mutex);
- err = generic_osync_inode(inode, mapping,
- OSYNC_METADATA|OSYNC_DATA);
- mutex_unlock(&inode->i_mutex);
-
- if (err)
- ret = err;
- }
+ err = generic_write_sync(out, *ppos, ret);
+ if (err)
+ ret = err;
+ else
+ *ppos += ret;
balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
}

diff --git a/fs/sync.c b/fs/sync.c
index 3422ba6..6fe72e6 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -176,19 +176,23 @@ int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
}

/**
- * vfs_fsync - perform a fsync or fdatasync on a file
+ * vfs_fsync_range - helper to sync a range of data & metadata to disk
* @file: file to sync
* @dentry: dentry of @file
- * @data: only perform a fdatasync operation
+ * @start: offset in bytes of the beginning of data range to sync
+ * @end: offset in bytes of the end of data range (inclusive)
+ * @datasync: perform only datasync
*
- * Write back data and metadata for @file to disk. If @datasync is
- * set only metadata needed to access modified file data is written.
+ * Write back data in range @start..@end and metadata for @file to disk. If
+ * @datasync is set only metadata needed to access modified file data is
+ * written.
*
* In case this function is called from nfsd @file may be %NULL and
* only @dentry is set. This can only happen when the filesystem
* implements the export_operations API.
*/
-int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
+int vfs_fsync_range(struct file *file, struct dentry *dentry, loff_t start,
+ loff_t end, int datasync)
{
const struct file_operations *fop;
struct address_space *mapping;
@@ -212,7 +216,7 @@ int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
goto out;
}

- ret = filemap_fdatawrite(mapping);
+ ret = filemap_fdatawrite_range(mapping, start, end);

/*
* We need to protect against concurrent writers, which could cause
@@ -223,12 +227,32 @@ int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
if (!ret)
ret = err;
mutex_unlock(&mapping->host->i_mutex);
- err = filemap_fdatawait(mapping);
+
+ err = filemap_fdatawait_range(mapping, start, end);
if (!ret)
ret = err;
out:
return ret;
}
+EXPORT_SYMBOL(vfs_fsync_range);
+
+/**
+ * vfs_fsync - perform a fsync or fdatasync on a file
+ * @file: file to sync
+ * @dentry: dentry of @file
+ * @datasync: only perform a fdatasync operation
+ *
+ * Write back data and metadata for @file to disk. If @datasync is
+ * set only metadata needed to access modified file data is written.
+ *
+ * In case this function is called from nfsd @file may be %NULL and
+ * only @dentry is set. This can only happen when the filesystem
+ * implements the export_operations API.
+ */
+int vfs_fsync(struct file *file, struct dentry *dentry, int datasync)
+{
+ return vfs_fsync_range(file, dentry, 0, LLONG_MAX, datasync);
+}
EXPORT_SYMBOL(vfs_fsync);

static int do_fsync(unsigned int fd, int datasync)
@@ -254,6 +278,23 @@ SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
return do_fsync(fd, 1);
}

+/**
+ * generic_write_sync - perform syncing after a write if file / inode is sync
+ * @file: file to which the write happened
+ * @pos: offset where the write started
+ * @count: length of the write
+ *
+ * This is just a simple wrapper about our general syncing function.
+ */
+int generic_write_sync(struct file *file, loff_t pos, loff_t count)
+{
+ if (!(file->f_flags & O_SYNC) && !IS_SYNC(file->f_mapping->host))
+ return 0;
+ return vfs_fsync_range(file, file->f_path.dentry, pos,
+ pos + count - 1, 1);
+}
+EXPORT_SYMBOL(generic_write_sync);
+
/*
* sys_sync_file_range() permits finely controlled syncing over a segment of
* a file in the range offset .. (offset+nbytes-1) inclusive. If nbytes is
diff --git a/include/linux/fs.h b/include/linux/fs.h
index bc7f0f1..18acaec 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2088,7 +2088,10 @@ extern int __filemap_fdatawrite_range(struct address_space *mapping,
extern int filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end);

+extern int vfs_fsync_range(struct file *file, struct dentry *dentry,
+ loff_t start, loff_t end, int datasync);
extern int vfs_fsync(struct file *file, struct dentry *dentry, int datasync);
+extern int generic_write_sync(struct file *file, loff_t pos, loff_t count);
extern void sync_supers(void);
extern void emergency_sync(void);
extern void emergency_remount(void);
diff --git a/mm/filemap.c b/mm/filemap.c
index 3955f7e..70988a1 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -39,11 +39,10 @@
/*
* FIXME: remove all knowledge of the buffer layer from the core VM
*/
-#include <linux/buffer_head.h> /* for generic_osync_inode */
+#include <linux/buffer_head.h> /* for try_to_free_buffers */

#include <asm/mman.h>

-
/*
* Shared mappings implemented 30.11.1994. It's not fully working yet,
* though.
@@ -2480,19 +2479,16 @@ ssize_t device_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
- struct address_space *mapping = file->f_mapping;
- struct inode *inode = mapping->host;
ssize_t ret;

BUG_ON(iocb->ki_pos != pos);

ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);

- if ((ret > 0 || ret == -EIOCBQUEUED) &&
- ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
+ if (ret > 0 || ret == -EIOCBQUEUED) {
ssize_t err;

- err = sync_page_range_nolock(inode, mapping, pos, ret);
+ err = generic_write_sync(file, pos, ret);
if (err < 0 && ret > 0)
ret = err;
}
@@ -2515,8 +2511,7 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
- struct address_space *mapping = file->f_mapping;
- struct inode *inode = mapping->host;
+ struct inode *inode = file->f_mapping->host;
ssize_t ret;

BUG_ON(iocb->ki_pos != pos);
@@ -2525,11 +2520,10 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
mutex_unlock(&inode->i_mutex);

- if ((ret > 0 || ret == -EIOCBQUEUED) &&
- ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
+ if (ret > 0 || ret == -EIOCBQUEUED) {
ssize_t err;

- err = sync_page_range(inode, mapping, pos, ret);
+ err = generic_write_sync(file, pos, ret);
if (err < 0 && ret > 0)
ret = err;
}
--
1.6.0.2


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