diff options
| -rw-r--r-- | fs/gfs2/glock.c | 314 | ||||
| -rw-r--r-- | fs/gfs2/glock.h | 4 | ||||
| -rw-r--r-- | fs/gfs2/incore.h | 1 | ||||
| -rw-r--r-- | fs/gfs2/main.c | 3 | ||||
| -rw-r--r-- | fs/gfs2/ops_fstype.c | 3 |
5 files changed, 262 insertions, 63 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c index 12accb08fe02..9f203ef4da61 100644 --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -23,6 +23,8 @@ #include <linux/module.h> #include <linux/rwsem.h> #include <asm/uaccess.h> +#include <linux/seq_file.h> +#include <linux/debugfs.h> #include "gfs2.h" #include "incore.h" @@ -40,14 +42,22 @@ struct gfs2_gl_hash_bucket { struct hlist_head hb_list; }; +struct glock_iter { + int hash; /* hash bucket index */ + struct gfs2_sbd *sdp; /* incore superblock */ + struct gfs2_glock *gl; /* current glock struct */ + struct hlist_head *hb_list; /* current hash bucket ptr */ + struct seq_file *seq; /* sequence file for debugfs */ + char string[512]; /* scratch space */ +}; + typedef void (*glock_examiner) (struct gfs2_glock * gl); static int gfs2_dump_lockstate(struct gfs2_sbd *sdp); -static int dump_glock(struct gfs2_glock *gl); -static int dump_inode(struct gfs2_inode *ip); static void gfs2_glock_xmote_th(struct gfs2_holder *gh); static void gfs2_glock_drop_th(struct gfs2_glock *gl); static DECLARE_RWSEM(gfs2_umount_flush_sem); +static struct dentry *gfs2_root; #define GFS2_GL_HASH_SHIFT 15 #define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT) @@ -1109,6 +1119,20 @@ find_holder_by_owner(struct list_head *head, struct task_struct *owner) return NULL; } +static void print_dbg(struct glock_iter *gi, const char *fmt, ...) +{ + va_list args; + + va_start(args, fmt); + if (gi) { + vsprintf(gi->string, fmt, args); + seq_printf(gi->seq, gi->string); + } + else + vprintk(fmt, args); + va_end(args); +} + /** * add_to_queue - Add a holder to the wait queue (but look for recursion) * @gh: the holder structure to add @@ -1849,31 +1873,32 @@ void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait) * Returns: 0 on success, -ENOBUFS when we run out of space */ -static int dump_holder(char *str, struct gfs2_holder *gh) +static int dump_holder(struct glock_iter *gi, char *str, + struct gfs2_holder *gh) { unsigned int x; - int error = -ENOBUFS; - printk(KERN_INFO " %s\n", str); - printk(KERN_INFO " owner = %ld\n", + print_dbg(gi, " %s\n", str); + print_dbg(gi, " owner = %ld\n", (gh->gh_owner) ? (long)gh->gh_owner->pid : -1); - printk(KERN_INFO " gh_state = %u\n", gh->gh_state); - printk(KERN_INFO " gh_flags ="); + print_dbg(gi, " gh_state = %u\n", gh->gh_state); + print_dbg(gi, " gh_flags ="); for (x = 0; x < 32; x++) if (gh->gh_flags & (1 << x)) - printk(" %u", x); - printk(" \n"); - printk(KERN_INFO " error = %d\n", gh->gh_error); - printk(KERN_INFO " gh_iflags ="); + print_dbg(gi, " %u", x); + print_dbg(gi, " \n"); + print_dbg(gi, " error = %d\n", gh->gh_error); + print_dbg(gi, " gh_iflags ="); for (x = 0; x < 32; x++) if (test_bit(x, &gh->gh_iflags)) - printk(" %u", x); - printk(" \n"); - print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); - - error = 0; + print_dbg(gi, " %u", x); + print_dbg(gi, " \n"); + if (gi) + print_dbg(gi, " initialized at: 0x%x\n", gh->gh_ip); + else + print_symbol(KERN_INFO " initialized at: %s\n", gh->gh_ip); - return error; + return 0; } /** @@ -1883,25 +1908,20 @@ static int dump_holder(char *str, struct gfs2_holder *gh) * Returns: 0 on success, -ENOBUFS when we run out of space */ -static int dump_inode(struct gfs2_inode *ip) +static int dump_inode(struct glock_iter *gi, struct gfs2_inode *ip) { unsigned int x; - int error = -ENOBUFS; - printk(KERN_INFO " Inode:\n"); - printk(KERN_INFO " num = %llu %llu\n", - (unsigned long long)ip->i_num.no_formal_ino, - (unsigned long long)ip->i_num.no_addr); - printk(KERN_INFO " type = %u\n", IF2DT(ip->i_inode.i_mode)); - printk(KERN_INFO " i_flags ="); + print_dbg(gi, " Inode:\n"); + print_dbg(gi, " num = %llu/%llu\n", + ip->i_num.no_formal_ino, ip->i_num.no_addr); + print_dbg(gi, " type = %u\n", IF2DT(ip->i_inode.i_mode)); + print_dbg(gi, " i_flags ="); for (x = 0; x < 32; x++) if (test_bit(x, &ip->i_flags)) - printk(" %u", x); - printk(" \n"); - - error = 0; - - return error; + print_dbg(gi, " %u", x); + print_dbg(gi, " \n"); + return 0; } /** @@ -1912,7 +1932,7 @@ static int dump_inode(struct gfs2_inode *ip) * Returns: 0 on success, -ENOBUFS when we run out of space */ -static int dump_glock(struct gfs2_glock *gl) +static int dump_glock(struct glock_iter *gi, struct gfs2_glock *gl) { struct gfs2_holder *gh; unsigned int x; @@ -1920,66 +1940,66 @@ static int dump_glock(struct gfs2_glock *gl) spin_lock(&gl->gl_spin); - printk(KERN_INFO "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type, - (unsigned long long)gl->gl_name.ln_number); - printk(KERN_INFO " gl_flags ="); + print_dbg(gi, "Glock 0x%p (%u, %llu)\n", gl, gl->gl_name.ln_type, + (unsigned long long)gl->gl_name.ln_number); + print_dbg(gi, " gl_flags ="); for (x = 0; x < 32; x++) { if (test_bit(x, &gl->gl_flags)) - printk(" %u", x); - } - printk(" \n"); - printk(KERN_INFO " gl_ref = %d\n", atomic_read(&gl->gl_ref)); - printk(KERN_INFO " gl_state = %u\n", gl->gl_state); - printk(KERN_INFO " gl_owner = %s\n", gl->gl_owner->comm); - print_symbol(KERN_INFO " gl_ip = %s\n", gl->gl_ip); - printk(KERN_INFO " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); - printk(KERN_INFO " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); - printk(KERN_INFO " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); - printk(KERN_INFO " object = %s\n", (gl->gl_object) ? "yes" : "no"); - printk(KERN_INFO " le = %s\n", + print_dbg(gi, " %u", x); + } + print_dbg(gi, " \n"); + print_dbg(gi, " gl_ref = %d\n", atomic_read(&gl->gl_ref)); + print_dbg(gi, " gl_state = %u\n", gl->gl_state); + print_dbg(gi, " gl_owner = %s\n", gl->gl_owner->comm); + print_dbg(gi, " gl_ip = %lu\n", gl->gl_ip); + print_dbg(gi, " req_gh = %s\n", (gl->gl_req_gh) ? "yes" : "no"); + print_dbg(gi, " req_bh = %s\n", (gl->gl_req_bh) ? "yes" : "no"); + print_dbg(gi, " lvb_count = %d\n", atomic_read(&gl->gl_lvb_count)); + print_dbg(gi, " object = %s\n", (gl->gl_object) ? "yes" : "no"); + print_dbg(gi, " le = %s\n", (list_empty(&gl->gl_le.le_list)) ? "no" : "yes"); - printk(KERN_INFO " reclaim = %s\n", - (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); + print_dbg(gi, " reclaim = %s\n", + (list_empty(&gl->gl_reclaim)) ? "no" : "yes"); if (gl->gl_aspace) - printk(KERN_INFO " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace, - gl->gl_aspace->i_mapping->nrpages); + print_dbg(gi, " aspace = 0x%p nrpages = %lu\n", gl->gl_aspace, + gl->gl_aspace->i_mapping->nrpages); else - printk(KERN_INFO " aspace = no\n"); - printk(KERN_INFO " ail = %d\n", atomic_read(&gl->gl_ail_count)); + print_dbg(gi, " aspace = no\n"); + print_dbg(gi, " ail = %d\n", atomic_read(&gl->gl_ail_count)); if (gl->gl_req_gh) { - error = dump_holder("Request", gl->gl_req_gh); + error = dump_holder(gi, "Request", gl->gl_req_gh); if (error) goto out; } list_for_each_entry(gh, &gl->gl_holders, gh_list) { - error = dump_holder("Holder", gh); + error = dump_holder(gi, "Holder", gh); if (error) goto out; } list_for_each_entry(gh, &gl->gl_waiters1, gh_list) { - error = dump_holder("Waiter1", gh); + error = dump_holder(gi, "Waiter1", gh); if (error) goto out; } list_for_each_entry(gh, &gl->gl_waiters2, gh_list) { - error = dump_holder("Waiter2", gh); + error = dump_holder(gi, "Waiter2", gh); if (error) goto out; } list_for_each_entry(gh, &gl->gl_waiters3, gh_list) { - error = dump_holder("Waiter3", gh); + error = dump_holder(gi, "Waiter3", gh); if (error) goto out; } if (gl->gl_ops == &gfs2_inode_glops && gl->gl_object) { if (!test_bit(GLF_LOCK, &gl->gl_flags) && - list_empty(&gl->gl_holders)) { - error = dump_inode(gl->gl_object); + list_empty(&gl->gl_holders)) { + error = dump_inode(gi, gl->gl_object); if (error) goto out; } else { error = -ENOBUFS; - printk(KERN_INFO " Inode: busy\n"); + print_dbg(gi, " Inode: busy\n"); } } @@ -2014,7 +2034,7 @@ static int gfs2_dump_lockstate(struct gfs2_sbd *sdp) if (gl->gl_sbd != sdp) continue; - error = dump_glock(gl); + error = dump_glock(NULL, gl); if (error) break; } @@ -2043,3 +2063,171 @@ int __init gfs2_glock_init(void) return 0; } +static int gfs2_glock_iter_next(struct glock_iter *gi) +{ + while (1) { + if (!gi->hb_list) { /* If we don't have a hash bucket yet */ + gi->hb_list = &gl_hash_table[gi->hash].hb_list; + if (hlist_empty(gi->hb_list)) { + gi->hash++; + gi->hb_list = NULL; + if (gi->hash >= GFS2_GL_HASH_SIZE) + return 1; + else + continue; + } + if (!hlist_empty(gi->hb_list)) { + gi->gl = list_entry(gi->hb_list->first, + struct gfs2_glock, + gl_list); + } + } else { + if (gi->gl->gl_list.next == NULL) { + gi->hash++; + gi->hb_list = NULL; + continue; + } + gi->gl = list_entry(gi->gl->gl_list.next, + struct gfs2_glock, gl_list); + } + if (gi->gl) + break; + } + return 0; +} + +static void gfs2_glock_iter_free(struct glock_iter *gi) +{ + kfree(gi); +} + +static struct glock_iter *gfs2_glock_iter_init(struct gfs2_sbd *sdp) +{ + struct glock_iter *gi; + + gi = kmalloc(sizeof (*gi), GFP_KERNEL); + if (!gi) + return NULL; + + gi->sdp = sdp; + gi->hash = 0; + gi->gl = NULL; + gi->hb_list = NULL; + gi->seq = NULL; + memset(gi->string, 0, sizeof(gi->string)); + + if (gfs2_glock_iter_next(gi)) { + gfs2_glock_iter_free(gi); + return NULL; + } + + return gi; +} + +static void *gfs2_glock_seq_start(struct seq_file *file, loff_t *pos) +{ + struct glock_iter *gi; + loff_t n = *pos; + + gi = gfs2_glock_iter_init(file->private); + if (!gi) + return NULL; + + while (n--) { + if (gfs2_glock_iter_next(gi)) { + gfs2_glock_iter_free(gi); + return NULL; + } + } + + return gi; +} + +static void *gfs2_glock_seq_next(struct seq_file *file, void *iter_ptr, + loff_t *pos) +{ + struct glock_iter *gi = iter_ptr; + + (*pos)++; + + if (gfs2_glock_iter_next(gi)) { + gfs2_glock_iter_free(gi); + return NULL; + } + + return gi; +} + +static void gfs2_glock_seq_stop(struct seq_file *file, void *iter_ptr) +{ + /* nothing for now */ +} + +static int gfs2_glock_seq_show(struct seq_file *file, void *iter_ptr) +{ + struct glock_iter *gi = iter_ptr; + + gi->seq = file; + dump_glock(gi, gi->gl); + + return 0; +} + +static struct seq_operations gfs2_glock_seq_ops = { + .start = gfs2_glock_seq_start, + .next = gfs2_glock_seq_next, + .stop = gfs2_glock_seq_stop, + .show = gfs2_glock_seq_show, +}; + +static int gfs2_debugfs_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int ret; + + ret = seq_open(file, &gfs2_glock_seq_ops); + if (ret) + return ret; + + seq = file->private_data; + seq->private = inode->i_private; + + return 0; +} + +static const struct file_operations gfs2_debug_fops = { + .owner = THIS_MODULE, + .open = gfs2_debugfs_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release +}; + +int gfs2_create_debugfs_file(struct gfs2_sbd *sdp) +{ + sdp->debugfs_dentry = debugfs_create_file(sdp->sd_table_name, + S_IFREG | S_IRUGO, + gfs2_root, sdp, + &gfs2_debug_fops); + if (!sdp->debugfs_dentry) + return -ENOMEM; + + return 0; +} + +void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp) +{ + if (sdp->debugfs_dentry) + debugfs_remove(sdp->debugfs_dentry); +} + +int gfs2_register_debugfs(void) +{ + gfs2_root = debugfs_create_dir("gfs2", NULL); + return gfs2_root ? 0 : -ENOMEM; +} + +void gfs2_unregister_debugfs(void) +{ + debugfs_remove(gfs2_root); +} diff --git a/fs/gfs2/glock.h b/fs/gfs2/glock.h index f50e40ceca43..d7cef7408728 100644 --- a/fs/gfs2/glock.h +++ b/fs/gfs2/glock.h @@ -135,5 +135,9 @@ void gfs2_scand_internal(struct gfs2_sbd *sdp); void gfs2_gl_hash_clear(struct gfs2_sbd *sdp, int wait); int __init gfs2_glock_init(void); +int gfs2_create_debugfs_file(struct gfs2_sbd *sdp); +void gfs2_delete_debugfs_file(struct gfs2_sbd *sdp); +int gfs2_register_debugfs(void); +void gfs2_unregister_debugfs(void); #endif /* __GLOCK_DOT_H__ */ diff --git a/fs/gfs2/incore.h b/fs/gfs2/incore.h index 49f0dbf40d86..7555261d911f 100644 --- a/fs/gfs2/incore.h +++ b/fs/gfs2/incore.h @@ -611,6 +611,7 @@ struct gfs2_sbd { unsigned long sd_last_warning; struct vfsmount *sd_gfs2mnt; + struct dentry *debugfs_dentry; /* for debugfs */ }; #endif /* __INCORE_DOT_H__ */ diff --git a/fs/gfs2/main.c b/fs/gfs2/main.c index 6e8a59809abf..218395371dbe 100644 --- a/fs/gfs2/main.c +++ b/fs/gfs2/main.c @@ -103,6 +103,8 @@ static int __init init_gfs2_fs(void) if (error) goto fail_unregister; + gfs2_register_debugfs(); + printk("GFS2 (built %s %s) installed\n", __DATE__, __TIME__); return 0; @@ -130,6 +132,7 @@ fail: static void __exit exit_gfs2_fs(void) { + gfs2_unregister_debugfs(); unregister_filesystem(&gfs2_fs_type); unregister_filesystem(&gfs2meta_fs_type); diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c index ee54cb667083..ecb8b18de0ee 100644 --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -690,6 +690,8 @@ static int fill_super(struct super_block *sb, void *data, int silent) if (error) goto fail; + gfs2_create_debugfs_file(sdp); + error = gfs2_sys_fs_add(sdp); if (error) goto fail; @@ -896,6 +898,7 @@ error: static void gfs2_kill_sb(struct super_block *sb) { + gfs2_delete_debugfs_file(sb->s_fs_info); kill_block_super(sb); } |