GFS2: Extend the life of the reservations
This patch lengthens the lifespan of the reservations structure for
inodes. Before, they were allocated and deallocated for every write
operation. With this patch, they are allocated when the first write
occurs, and deallocated when the last process closes the file.
It's more efficient to do it this way because it saves GFS2 a lot of
unnecessary allocates and frees. It also gives us more flexibility
for the future: (1) we can now fold the qadata structure back into
the structure and save those alloc/frees, (2) we can use this for
multi-block reservations.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
diff --git a/fs/gfs2/file.c b/fs/gfs2/file.c
index 31b199f..3790617 100644
--- a/fs/gfs2/file.c
+++ b/fs/gfs2/file.c
@@ -376,6 +376,10 @@
*/
vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
+ ret = gfs2_rs_alloc(ip);
+ if (ret)
+ return ret;
+
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
ret = gfs2_glock_nq(&gh);
if (ret)
@@ -569,10 +573,15 @@
{
struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
struct gfs2_file *fp;
+ struct gfs2_inode *ip = GFS2_I(inode);
fp = file->private_data;
file->private_data = NULL;
+ if ((file->f_mode & FMODE_WRITE) && ip->i_res &&
+ (atomic_read(&inode->i_writecount) == 1))
+ gfs2_rs_delete(ip);
+
if (gfs2_assert_warn(sdp, fp))
return -EIO;
@@ -653,12 +662,16 @@
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
+ struct dentry *dentry = file->f_dentry;
+ struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
+ int ret;
+
+ ret = gfs2_rs_alloc(ip);
+ if (ret)
+ return ret;
if (file->f_flags & O_APPEND) {
- struct dentry *dentry = file->f_dentry;
- struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
struct gfs2_holder gh;
- int ret;
ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
if (ret)
@@ -774,6 +787,10 @@
if (bytes == 0)
bytes = sdp->sd_sb.sb_bsize;
+ error = gfs2_rs_alloc(ip);
+ if (error)
+ return error;
+
gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
error = gfs2_glock_nq(&ip->i_gh);
if (unlikely(error))