Commit dba898b0 authored by Steven Whitehouse's avatar Steven Whitehouse
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GFS2: Clean up fsync() 



This patch is designed to clean up GFS2's fsync
implementation and ensure that it really does get everything on
disk. Since ->write_inode() has been updated, we can call that
via the vfs library function sync_inode_metadata() and the only
remaining thing that has to be done is to ensure that we get
any revoke records in the log after the inode has been written back.

Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
parent efc1a9c2

fs/gfs2/file.c

+13 −23
Original line number Diff line number Diff line
@@ -545,18 +545,10 @@ static int gfs2_close(struct inode *inode, struct file *file) 
/**

 * gfs2_fsync - sync the dirty data for a file (across the cluster)

 * @file: the file that points to the dentry (we ignore this)

 * @dentry: the dentry that points to the inode to sync

 * @datasync: set if we can ignore timestamp changes

 *

 * The VFS will flush "normal" data for us. We only need to worry

 * about metadata here. For journaled data, we just do a log flush

 * as we can't avoid it. Otherwise we can just bale out if datasync

 * is set. For stuffed inodes we must flush the log in order to

 * ensure that all data is on disk.

 *

 * The call to write_inode_now() is there to write back metadata and

 * the inode itself. It does also try and write the data, but thats

 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()

 * for us.

 * The VFS will flush data for us. We only need to worry

 * about metadata here.

 *

 * Returns: errno

 */
@@ -565,22 +557,20 @@ static int gfs2_fsync(struct file *file, int datasync) 
{

	struct inode *inode = file->f_mapping->host;

	int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);

	int ret = 0;



	if (gfs2_is_jdata(GFS2_I(inode))) {

		gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);

		return 0;

	}

	struct gfs2_inode *ip = GFS2_I(inode);

	int ret;



	if (sync_state != 0) {

		if (!datasync)

			ret = write_inode_now(inode, 0);

	if (datasync)

		sync_state &= ~I_DIRTY_SYNC;



		if (gfs2_is_stuffed(GFS2_I(inode)))

			gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);

	if (sync_state) {

		ret = sync_inode_metadata(inode, 1);

		if (ret)

			return ret;

		gfs2_ail_flush(ip->i_gl);

	}



	return ret;

	return 0;

}



/**

fs/gfs2/glops.c

+42 −17
Original line number Diff line number Diff line
@@ -28,33 +28,18 @@ 
#include "trans.h"



/**

 * ail_empty_gl - remove all buffers for a given lock from the AIL

 * __gfs2_ail_flush - remove all buffers for a given lock from the AIL

 * @gl: the glock

 *

 * None of the buffers should be dirty, locked, or pinned.

 */



static void gfs2_ail_empty_gl(struct gfs2_glock *gl)

static void __gfs2_ail_flush(struct gfs2_glock *gl)

{

	struct gfs2_sbd *sdp = gl->gl_sbd;

	struct list_head *head = &gl->gl_ail_list;

	struct gfs2_bufdata *bd;

	struct buffer_head *bh;

	struct gfs2_trans tr;



	memset(&tr, 0, sizeof(tr));

	tr.tr_revokes = atomic_read(&gl->gl_ail_count);



	if (!tr.tr_revokes)

		return;



	/* A shortened, inline version of gfs2_trans_begin() */

	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));

	tr.tr_ip = (unsigned long)__builtin_return_address(0);

	INIT_LIST_HEAD(&tr.tr_list_buf);

	gfs2_log_reserve(sdp, tr.tr_reserved);

	BUG_ON(current->journal_info);

	current->journal_info = &tr;



	spin_lock(&sdp->sd_ail_lock);

	while (!list_empty(head)) {
@@ -76,7 +61,47 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl) 
	}

	gfs2_assert_withdraw(sdp, !atomic_read(&gl->gl_ail_count));

	spin_unlock(&sdp->sd_ail_lock);

}





static void gfs2_ail_empty_gl(struct gfs2_glock *gl)

{

	struct gfs2_sbd *sdp = gl->gl_sbd;

	struct gfs2_trans tr;



	memset(&tr, 0, sizeof(tr));

	tr.tr_revokes = atomic_read(&gl->gl_ail_count);



	if (!tr.tr_revokes)

		return;



	/* A shortened, inline version of gfs2_trans_begin() */

	tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));

	tr.tr_ip = (unsigned long)__builtin_return_address(0);

	INIT_LIST_HEAD(&tr.tr_list_buf);

	gfs2_log_reserve(sdp, tr.tr_reserved);

	BUG_ON(current->journal_info);

	current->journal_info = &tr;



	__gfs2_ail_flush(gl);



	gfs2_trans_end(sdp);

	gfs2_log_flush(sdp, NULL);

}



void gfs2_ail_flush(struct gfs2_glock *gl)

{

	struct gfs2_sbd *sdp = gl->gl_sbd;

	unsigned int revokes = atomic_read(&gl->gl_ail_count);

	int ret;



	if (!revokes)

		return;



	ret = gfs2_trans_begin(sdp, 0, revokes);

	if (ret)

		return;

	__gfs2_ail_flush(gl);

	gfs2_trans_end(sdp);

	gfs2_log_flush(sdp, NULL);

}

fs/gfs2/glops.h

+2 −0
Original line number Diff line number Diff line
@@ -23,4 +23,6 @@ extern const struct gfs2_glock_operations gfs2_quota_glops; 
extern const struct gfs2_glock_operations gfs2_journal_glops;

extern const struct gfs2_glock_operations *gfs2_glops_list[];



extern void gfs2_ail_flush(struct gfs2_glock *gl);



#endif /* __GLOPS_DOT_H__ */

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