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-   -   GFS2: Review bug traps in glops.c (http://www.linux-archive.org/cluster-development/709330-gfs2-review-bug-traps-glops-c.html)

Steven Whitehouse 10-03-2012 01:43 PM

GFS2: Review bug traps in glops.c
 
Two of the bug traps here could really be warnings. The others are
converted from BUG() to GLOCK_BUG_ON() since we'll most likely
need to know the glock state in order to debug any issues which
arise. As a result of this, __dump_glock has to be renamed and
is no longer static.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index e6c2fd5..e543871 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -55,8 +55,6 @@ struct gfs2_glock_iter {

typedef void (*glock_examiner) (struct gfs2_glock * gl);

-static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl);
-#define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { __dump_glock(NULL, gl); BUG(); } } while(0)
static void do_xmote(struct gfs2_glock *gl, struct gfs2_holder *gh, unsigned int target);

static struct dentry *gfs2_root;
@@ -1013,7 +1011,7 @@ trap_recursive:
printk(KERN_ERR "pid: %d
", pid_nr(gh->gh_owner_pid));
printk(KERN_ERR "lock type: %d req lock state : %d
",
gh->gh_gl->gl_name.ln_type, gh->gh_state);
- __dump_glock(NULL, gl);
+ gfs2_dump_glock(NULL, gl);
BUG();
}

@@ -1508,7 +1506,7 @@ static int dump_glock(struct seq_file *seq, struct gfs2_glock *gl)
{
int ret;
spin_lock(&gl->gl_spin);
- ret = __dump_glock(seq, gl);
+ ret = gfs2_dump_glock(seq, gl);
spin_unlock(&gl->gl_spin);
return ret;
}
@@ -1655,7 +1653,7 @@ static const char *gflags2str(char *buf, const struct gfs2_glock *gl)
}

/**
- * __dump_glock - print information about a glock
+ * gfs2_dump_glock - print information about a glock
* @seq: The seq_file struct
* @gl: the glock
*
@@ -1672,7 +1670,7 @@ static const char *gflags2str(char *buf, const struct gfs2_glock *gl)
* Returns: 0 on success, -ENOBUFS when we run out of space
*/

-static int __dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
+int gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl)
{
const struct gfs2_glock_operations *glops = gl->gl_ops;
unsigned long long dtime;
diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h
index 307ac31..fd580b7 100644
--- a/fs/gfs2/glock.h
+++ b/fs/gfs2/glock.h
@@ -178,33 +178,33 @@ static inline struct address_space *gfs2_glock2aspace(struct gfs2_glock *gl)
return NULL;
}

-int gfs2_glock_get(struct gfs2_sbd *sdp,
- u64 number, const struct gfs2_glock_operations *glops,
- int create, struct gfs2_glock **glp);
-void gfs2_glock_hold(struct gfs2_glock *gl);
-void gfs2_glock_put_nolock(struct gfs2_glock *gl);
-void gfs2_glock_put(struct gfs2_glock *gl);
-void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state, unsigned flags,
- struct gfs2_holder *gh);
-void gfs2_holder_reinit(unsigned int state, unsigned flags,
- struct gfs2_holder *gh);
-void gfs2_holder_uninit(struct gfs2_holder *gh);
-int gfs2_glock_nq(struct gfs2_holder *gh);
-int gfs2_glock_poll(struct gfs2_holder *gh);
-int gfs2_glock_wait(struct gfs2_holder *gh);
-void gfs2_glock_dq(struct gfs2_holder *gh);
-void gfs2_glock_dq_wait(struct gfs2_holder *gh);
-
-void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
-int gfs2_glock_nq_num(struct gfs2_sbd *sdp,
- u64 number, const struct gfs2_glock_operations *glops,
- unsigned int state, int flags, struct gfs2_holder *gh);
-
-int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
-void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
-void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
-
-__printf(2, 3)
+extern int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
+ const struct gfs2_glock_operations *glops,
+ int create, struct gfs2_glock **glp);
+extern void gfs2_glock_hold(struct gfs2_glock *gl);
+extern void gfs2_glock_put_nolock(struct gfs2_glock *gl);
+extern void gfs2_glock_put(struct gfs2_glock *gl);
+extern void gfs2_holder_init(struct gfs2_glock *gl, unsigned int state,
+ unsigned flags, struct gfs2_holder *gh);
+extern void gfs2_holder_reinit(unsigned int state, unsigned flags,
+ struct gfs2_holder *gh);
+extern void gfs2_holder_uninit(struct gfs2_holder *gh);
+extern int gfs2_glock_nq(struct gfs2_holder *gh);
+extern int gfs2_glock_poll(struct gfs2_holder *gh);
+extern int gfs2_glock_wait(struct gfs2_holder *gh);
+extern void gfs2_glock_dq(struct gfs2_holder *gh);
+extern void gfs2_glock_dq_wait(struct gfs2_holder *gh);
+extern void gfs2_glock_dq_uninit(struct gfs2_holder *gh);
+extern int gfs2_glock_nq_num(struct gfs2_sbd *sdp, u64 number,
+ const struct gfs2_glock_operations *glops,
+ unsigned int state, int flags,
+ struct gfs2_holder *gh);
+extern int gfs2_glock_nq_m(unsigned int num_gh, struct gfs2_holder *ghs);
+extern void gfs2_glock_dq_m(unsigned int num_gh, struct gfs2_holder *ghs);
+extern void gfs2_glock_dq_uninit_m(unsigned int num_gh, struct gfs2_holder *ghs);
+extern int gfs2_dump_glock(struct seq_file *seq, const struct gfs2_glock *gl);
+#define GLOCK_BUG_ON(gl,x) do { if (unlikely(x)) { gfs2_dump_glock(NULL, gl); BUG(); } } while(0)
+extern __printf(2, 3)
void gfs2_print_dbg(struct seq_file *seq, const char *fmt, ...);

/**
diff --git a/fs/gfs2/glops.c b/fs/gfs2/glops.c
index 32cc4fd..0a3e7c7 100644
--- a/fs/gfs2/glops.c
+++ b/fs/gfs2/glops.c
@@ -74,7 +74,7 @@ static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)

gfs2_trans_add_revoke(sdp, bd);
}
- BUG_ON(!fsync && atomic_read(&gl->gl_ail_count));
+ GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
spin_unlock(&sdp->sd_ail_lock);
gfs2_log_unlock(sdp);
}
@@ -96,7 +96,7 @@ static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
tr.tr_ip = (unsigned long)__builtin_return_address(0);
sb_start_intwrite(sdp->sd_vfs);
gfs2_log_reserve(sdp, tr.tr_reserved);
- BUG_ON(current->journal_info);
+ WARN_ON_ONCE(current->journal_info);
current->journal_info = &tr;

__gfs2_ail_flush(gl, 0);
@@ -139,7 +139,7 @@ static void rgrp_go_sync(struct gfs2_glock *gl)

if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
return;
- BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
+ GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);

gfs2_log_flush(gl->gl_sbd, gl);
filemap_fdatawrite(metamapping);
@@ -168,7 +168,7 @@ static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
{
struct address_space *mapping = gfs2_glock2aspace(gl);

- BUG_ON(!(flags & DIO_METADATA));
+ WARN_ON_ONCE(!(flags & DIO_METADATA));
gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
truncate_inode_pages(mapping, 0);

@@ -197,7 +197,7 @@ static void inode_go_sync(struct gfs2_glock *gl)
if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
return;

- BUG_ON(gl->gl_state != LM_ST_EXCLUSIVE);
+ GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);

gfs2_log_flush(gl->gl_sbd, gl);
filemap_fdatawrite(metamapping);


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