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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: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse 2011-04-14 09:54:02 +01:00
parent efc1a9c2a7
commit dba898b02d
3 changed files with 58 additions and 41 deletions
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38
fs/gfs2/file.c
View File

@ -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;
struct gfs2_inode *ip = GFS2_I(inode);
int ret;
if (gfs2_is_jdata(GFS2_I(inode))) {
gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
return 0;
if (datasync)
sync_state &= ~I_DIRTY_SYNC;
if (sync_state) {
ret = sync_inode_metadata(inode, 1);
if (ret)
return ret;
gfs2_ail_flush(ip->i_gl);
}
if (sync_state != 0) {
if (!datasync)
ret = write_inode_now(inode, 0);
if (gfs2_is_stuffed(GFS2_I(inode)))
gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
}
return ret;
return 0;
}
/**

59
fs/gfs2/glops.c
View File

@ -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);
}

2
fs/gfs2/glops.h
View File

@ -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__ */