Commit d55b4da4 authored by David Howells's avatar David Howells
Browse files

afs: Introduce a statistics proc file 



Introduce a proc file that displays a bunch of statistics for the AFS
filesystem in the current network namespace.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
parent 888b3384

fs/afs/dir.c

+3 −0
Original line number Diff line number Diff line
@@ -206,6 +206,7 @@ bool afs_dir_check_page(struct inode *dir, struct page *page) 
	}



checked:

	afs_stat_v(vnode, n_read_dir);

	SetPageChecked(page);

	return true;
@@ -868,6 +869,7 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry, 
	    dentry->d_name.name[dentry->d_name.len - 1] == 's')

		return afs_lookup_atsys(dir, dentry, key);



	afs_stat_v(dvnode, n_lookup);

	inode = afs_do_lookup(dir, dentry, key);

	if (IS_ERR(inode)) {

		ret = PTR_ERR(inode);
@@ -1062,6 +1064,7 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags) 
		goto out_valid; /* the dir contents are unchanged */



	_debug("dir modified");

	afs_stat_v(dir, n_reval);



	/* search the directory for this vnode */

	ret = afs_do_lookup_one(&dir->vfs_inode, dentry, &fid, key);

fs/afs/inode.c

+3 −0
Original line number Diff line number Diff line
@@ -366,6 +366,9 @@ void afs_zap_data(struct afs_vnode *vnode) 
{

	_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);



	if (S_ISDIR(vnode->vfs_inode.i_mode))

		afs_stat_v(vnode, n_inval);



#ifdef CONFIG_AFS_FSCACHE

	fscache_invalidate(vnode->cache);

#endif

fs/afs/internal.h

+14 −1
Original line number Diff line number Diff line
@@ -260,6 +260,12 @@ struct afs_net { 
	struct proc_dir_entry	*proc_afs;	/* /proc/net/afs directory */

	struct afs_sysnames	*sysnames;

	rwlock_t		sysnames_lock;



	/* Statistics counters */

	atomic_t		n_lookup;	/* Number of lookups done */

	atomic_t		n_reval;	/* Number of dentries needing revalidation */

	atomic_t		n_inval;	/* Number of invalidations by the server */

	atomic_t		n_read_dir;	/* Number of directory pages read */

};



extern const char afs_init_sysname[];
@@ -777,6 +783,13 @@ static inline void afs_put_net(struct afs_net *net) 
{

}



static inline void __afs_stat(atomic_t *s)

{

	atomic_inc(s);

}



#define afs_stat_v(vnode, n) __afs_stat(&afs_v2net(vnode)->n)



/*

 * misc.c

 */

fs/afs/proc.c

+37 −0
Original line number Diff line number Diff line
@@ -152,6 +152,8 @@ static const struct file_operations afs_proc_sysname_fops = { 
	.write		= afs_proc_sysname_write,

};



static const struct file_operations afs_proc_stats_fops;



/*

 * initialise the /proc/fs/afs/ directory

 */
@@ -166,6 +168,7 @@ int afs_proc_init(struct afs_net *net) 
	if (!proc_create("cells", 0644, net->proc_afs, &afs_proc_cells_fops) ||

	    !proc_create("rootcell", 0644, net->proc_afs, &afs_proc_rootcell_fops) ||

	    !proc_create("servers", 0644, net->proc_afs, &afs_proc_servers_fops) ||

	    !proc_create("stats", 0644, net->proc_afs, &afs_proc_stats_fops) ||

	    !proc_create("sysname", 0644, net->proc_afs, &afs_proc_sysname_fops))

		goto error_tree;
@@ -897,3 +900,37 @@ static int afs_proc_sysname_show(struct seq_file *m, void *v) 
		seq_printf(m, "%s\n", sysnames->subs[i]);

	return 0;

}



/*

 * Display general per-net namespace statistics

 */

static int afs_proc_stats_show(struct seq_file *m, void *v)

{

	struct afs_net *net = afs_seq2net(m);



	seq_puts(m, "kAFS statistics\n");



	seq_printf(m, "dir-mgmt: look=%u reval=%u inval=%u\n",

		   atomic_read(&net->n_lookup),

		   atomic_read(&net->n_reval),

		   atomic_read(&net->n_inval));



	seq_printf(m, "dir-data: rdpg=%u\n",

		   atomic_read(&net->n_read_dir));

	return 0;

}



/*

 * Open "/proc/fs/afs/stats" to allow reading of the stat counters.

 */

static int afs_proc_stats_open(struct inode *inode, struct file *file)

{

	return single_open(file, afs_proc_stats_show, NULL);

}



static const struct file_operations afs_proc_stats_fops = {

	.open		= afs_proc_stats_open,

	.read		= seq_read,

	.llseek		= seq_lseek,

	.release        = single_release,

};