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linprocfs: Add nodes for inotify

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These map directly onto sysctls under vfs.inotify of the same name.

Reviewed by:	olce, des
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D53142
This commit is contained in:
Mark Johnston 2025-10-17 12:55:56 +00:00
parent dfc1041c08
commit 28c0ef7684
1 changed files with 72 additions and 5 deletions
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77
sys/compat/linprocfs/linprocfs.c
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@ -2216,6 +2216,67 @@ linprocfs_dosysvipc_shm(PFS_FILL_ARGS)
return (0);
}
static int
linprocfs_doinotify(const char *sysctl, PFS_FILL_ARGS)
{
size_t size;
int error, val;
if (uio->uio_rw == UIO_READ) {
size = sizeof(val);
error = kernel_sysctlbyname(curthread,
__DECONST(void *, sysctl), &val, &size, NULL, 0, 0, 0);
if (error == 0)
sbuf_printf(sb, "%d\n", val);
} else {
char *endp, *newval;
long vall;
sbuf_trim(sb);
sbuf_finish(sb);
newval = sbuf_data(sb);
vall = strtol(newval, &endp, 10);
if (vall < 0 || vall > INT_MAX || endp == newval ||
*endp != '\0')
return (EINVAL);
val = (int)vall;
error = kernel_sysctlbyname(curthread,
__DECONST(void *, sysctl), NULL, NULL,
&val, sizeof(val), 0, 0);
}
return (error);
}
/*
* Filler function for proc/sys/fs/inotify/max_queued_events
*/
static int
linprocfs_doinotify_max_queued_events(PFS_FILL_ARGS)
{
return (linprocfs_doinotify("vfs.inotify.max_queued_events",
PFS_FILL_ARGNAMES));
}
/*
* Filler function for proc/sys/fs/inotify/max_user_instances
*/
static int
linprocfs_doinotify_max_user_instances(PFS_FILL_ARGS)
{
return (linprocfs_doinotify("vfs.inotify.max_user_instances",
PFS_FILL_ARGNAMES));
}
/*
* Filler function for proc/sys/fs/inotify/max_user_watches
*/
static int
linprocfs_doinotify_max_user_watches(PFS_FILL_ARGS)
{
return (linprocfs_doinotify("vfs.inotify.max_user_watches",
PFS_FILL_ARGNAMES));
}
/*
* Filler function for proc/sys/fs/mqueue/msg_default
*/
@ -2313,9 +2374,7 @@ linprocfs_domqueue_queues_max(PFS_FILL_ARGS)
static int
linprocfs_init(PFS_INIT_ARGS)
{
struct pfs_node *root;
struct pfs_node *dir;
struct pfs_node *sys;
struct pfs_node *dir, *fs, *root, *sys;
root = pi->pi_root;
@ -2466,10 +2525,18 @@ linprocfs_init(PFS_INIT_ARGS)
NULL, PFS_RD);
/* /proc/sys/fs/... */
pfs_create_dir(sys, &dir, "fs", NULL, NULL, NULL, 0);
pfs_create_dir(sys, &fs, "fs", NULL, NULL, NULL, 0);
pfs_create_dir(fs, &dir, "inotify", NULL, NULL, NULL, 0);
pfs_create_file(dir, NULL, "max_queued_events",
&linprocfs_doinotify_max_queued_events, NULL, NULL, NULL, PFS_RDWR);
pfs_create_file(dir, NULL, "max_user_instances",
&linprocfs_doinotify_max_user_instances, NULL, NULL, NULL, PFS_RDWR);
pfs_create_file(dir, NULL, "max_user_watches",
&linprocfs_doinotify_max_user_watches, NULL, NULL, NULL, PFS_RDWR);
/* /proc/sys/fs/mqueue/... */
pfs_create_dir(dir, &dir, "mqueue", NULL, NULL, NULL, 0);
pfs_create_dir(fs, &dir, "mqueue", NULL, NULL, NULL, 0);
pfs_create_file(dir, NULL, "msg_default",
&linprocfs_domqueue_msg_default, NULL, NULL, NULL, PFS_RD);
pfs_create_file(dir, NULL, "msgsize_default",