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gfs2: Get rid of demote_ok checks

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The demote_ok glock operation is only still used to prevent the inode
glocks of the "jindex" and "rindex" directories from getting recycled
while they are still referenced by sdp->sd_jindex and sdp->sd_rindex.
However, the LRU walking code will no longer recycle glocks which are
referenced, so the demote_ok glock operation is obsolete and can be
removed.

Each of a glock's holders in the gl_holders list is holding a reference
on the glock, so when the list of holders isn't empty in demote_ok(),
the existing reference count check will already prevent the glock from
getting released.  This means that demote_ok() is obsolete as well.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2024-03-28 20:46:25 +01:00
parent 3f4475bf24
commit 713f883438
4 changed files with 1 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/filesystems/gfs2-glocks.rst
View File

@ -61,8 +61,6 @@ Field Purpose
go_sync Called before remote state change (e.g. to sync dirty data)
go_xmote_bh Called after remote state change (e.g. to refill cache)
go_inval Called if remote state change requires invalidating the cache
go_demote_ok Returns boolean value of whether its ok to demote a glock
(e.g. checks timeout, and that there is no cached data)
go_instantiate Called when a glock has been acquired
go_held Called every time a glock holder is acquired
go_dump Called to print content of object for debugfs file, or on
@ -95,7 +93,6 @@ Operation GLF_LOCK bit lock held gl_lockref.lock spinlock held
go_sync Yes No
go_xmote_bh Yes No
go_inval Yes No
go_demote_ok Sometimes Yes
go_instantiate No No
go_held No No
go_dump Sometimes Yes

23
fs/gfs2/glock.c
View File

@ -216,27 +216,6 @@ struct gfs2_glock *gfs2_glock_hold(struct gfs2_glock *gl)
return gl;
}
/**
* demote_ok - Check to see if it's ok to unlock a glock
* @gl: the glock
*
* Returns: 1 if it's ok
*/
static int demote_ok(const struct gfs2_glock *gl)
{
const struct gfs2_glock_operations *glops = gl->gl_ops;
if (gl->gl_state == LM_ST_UNLOCKED)
return 0;
if (!list_empty(&gl->gl_holders))
return 0;
if (glops->go_demote_ok)
return glops->go_demote_ok(gl);
return 1;
}
static void gfs2_glock_add_to_lru(struct gfs2_glock *gl)
{
spin_lock(&lru_lock);
@ -2049,7 +2028,7 @@ add_back_to_lru:
clear_bit(GLF_LRU, &gl->gl_flags);
freed++;
gl->gl_lockref.count++;
if (demote_ok(gl))
if (gl->gl_state != LM_ST_UNLOCKED)
request_demote(gl, LM_ST_UNLOCKED, 0, false);
gfs2_glock_queue_work(gl, 0);
spin_unlock(&gl->gl_lockref.lock);

18
fs/gfs2/glops.c
View File

@ -385,23 +385,6 @@ static void inode_go_inval(struct gfs2_glock *gl, int flags)
gfs2_clear_glop_pending(ip);
}
/**
* inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
* @gl: the glock
*
* Returns: 1 if it's ok
*/
static int inode_go_demote_ok(const struct gfs2_glock *gl)
{
struct gfs2_sbd *sdp = gl->gl_name.ln_sbd;
if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
return 0;
return 1;
}
static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
{
struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
@ -722,7 +705,6 @@ const struct gfs2_glock_operations gfs2_meta_glops = {
const struct gfs2_glock_operations gfs2_inode_glops = {
.go_sync = inode_go_sync,
.go_inval = inode_go_inval,
.go_demote_ok = inode_go_demote_ok,
.go_instantiate = inode_go_instantiate,
.go_held = inode_go_held,
.go_dump = inode_go_dump,

1
fs/gfs2/incore.h
View File

@ -218,7 +218,6 @@ struct gfs2_glock_operations {
int (*go_sync) (struct gfs2_glock *gl);
int (*go_xmote_bh)(struct gfs2_glock *gl);
void (*go_inval) (struct gfs2_glock *gl, int flags);
int (*go_demote_ok) (const struct gfs2_glock *gl);
int (*go_instantiate) (struct gfs2_glock *gl);
int (*go_held)(struct gfs2_holder *gh);
void (*go_dump)(struct seq_file *seq, const struct gfs2_glock *gl,