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afs: Introduce a statistics proc file

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

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells
2018-04-06 14:17:24 +01:00
parent 888b338461
commit d55b4da433
4 changed files with 57 additions and 1 deletions
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37
fs/afs/proc.c
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@@ -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,
};