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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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3
fs/afs/dir.c
View File

@ -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);

3
fs/afs/inode.c
View File

@ -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

15
fs/afs/internal.h
View File

@ -257,9 +257,15 @@ struct afs_net {
struct mutex lock_manager_mutex;
/* Misc */
struct proc_dir_entry *proc_afs; /* /proc/net/afs directory */
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
*/

37
fs/afs/proc.c
View File

@ -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,
};