[linux-block.git] / fs / notify / fdinfo.c

#include <linux/file.h>
#include <linux/fs.h>
#include <linux/fsnotify_backend.h>
#include <linux/idr.h>
#include <linux/init.h>
#include <linux/inotify.h>
#include <linux/fanotify.h>
#include <linux/kernel.h>
#include <linux/namei.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <linux/exportfs.h>

#include "inotify/inotify.h"
#include "../fs/mount.h"

#if defined(CONFIG_PROC_FS)

#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)

static int show_fdinfo(struct seq_file *m, struct file *f,
		       int (*show)(struct seq_file *m, struct fsnotify_mark *mark))
{
	struct fsnotify_group *group = f->private_data;
	struct fsnotify_mark *mark;
	int ret = 0;

	spin_lock(&group->mark_lock);
	list_for_each_entry(mark, &group->marks_list, g_list) {
		ret = show(m, mark);
		if (ret)
			break;
	}
	spin_unlock(&group->mark_lock);
	return ret;
}

#if defined(CONFIG_EXPORTFS)
static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
	struct {
		struct file_handle handle;
		u8 pad[64];
	} f;
	int size, ret, i;

	f.handle.handle_bytes = sizeof(f.pad);
	size = f.handle.handle_bytes >> 2;

	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
	if ((ret == 255) || (ret == -ENOSPC)) {
		WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
		return 0;
	}

	f.handle.handle_type = ret;
	f.handle.handle_bytes = size * sizeof(u32);

	ret = seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
			 f.handle.handle_bytes, f.handle.handle_type);

	for (i = 0; i < f.handle.handle_bytes; i++)
		ret |= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);

	return ret;
}
#else
static int show_mark_fhandle(struct seq_file *m, struct inode *inode)
{
	return 0;
}
#endif

#ifdef CONFIG_INOTIFY_USER

static int inotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
	struct inotify_inode_mark *inode_mark;
	struct inode *inode;
	int ret = 0;

	if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE | FSNOTIFY_MARK_FLAG_INODE)))
		return 0;

	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
	inode = igrab(mark->i.inode);
	if (inode) {
		ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
				 "mask:%x ignored_mask:%x ",
				 inode_mark->wd, inode->i_ino,
				 inode->i_sb->s_dev,
				 mark->mask, mark->ignored_mask);
		ret |= show_mark_fhandle(m, inode);
		ret |= seq_putc(m, '\n');
		iput(inode);
	}

	return ret;
}

int inotify_show_fdinfo(struct seq_file *m, struct file *f)
{
	return show_fdinfo(m, f, inotify_fdinfo);
}

#endif /* CONFIG_INOTIFY_USER */

#ifdef CONFIG_FANOTIFY

static int fanotify_fdinfo(struct seq_file *m, struct fsnotify_mark *mark)
{
	struct inode *inode;
	int ret = 0;

	if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
		return 0;

	if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
		inode = igrab(mark->i.inode);
		if (!inode)
			goto out;
		ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
				 "mask:%x ignored_mask:%x ",
				 inode->i_ino, inode->i_sb->s_dev,
				 mark->mask, mark->ignored_mask);
		ret |= show_mark_fhandle(m, inode);
		ret |= seq_putc(m, '\n');
		iput(inode);
	} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
		struct mount *mnt = real_mount(mark->m.mnt);

		ret = seq_printf(m, "fanotify mnt_id:%x mask:%x "
				 "ignored_mask:%x\n",
				 mnt->mnt_id, mark->mask, mark->ignored_mask);
	}
out:
	return ret;
}

int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
{
	struct fsnotify_group *group = f->private_data;
	unsigned int flags = 0;

	switch (group->priority) {
	case FS_PRIO_0:
		flags |= FAN_CLASS_NOTIF;
		break;
	case FS_PRIO_1:
		flags |= FAN_CLASS_CONTENT;
		break;
	case FS_PRIO_2:
		flags |= FAN_CLASS_PRE_CONTENT;
		break;
	}

	if (group->max_events == UINT_MAX)
		flags |= FAN_UNLIMITED_QUEUE;

	if (group->fanotify_data.max_marks == UINT_MAX)
		flags |= FAN_UNLIMITED_MARKS;

	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
		   flags, group->fanotify_data.f_flags);

	return show_fdinfo(m, f, fanotify_fdinfo);
}

#endif /* CONFIG_FANOTIFY */

#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */

#endif /* CONFIG_PROC_FS */
Commit	Line	Data
be77196b CG	1	#include <linux/file.h>
	2	#include <linux/fs.h>
	3	#include <linux/fsnotify_backend.h>
	4	#include <linux/idr.h>
	5	#include <linux/init.h>
	6	#include <linux/inotify.h>
	7	#include <linux/fanotify.h>
	8	#include <linux/kernel.h>
	9	#include <linux/namei.h>
	10	#include <linux/sched.h>
	11	#include <linux/types.h>
	12	#include <linux/seq_file.h>
	13	#include <linux/proc_fs.h>
	14	#include <linux/exportfs.h>
	15
	16	#include "inotify/inotify.h"
	17	#include "../fs/mount.h"
	18
	19	#if defined(CONFIG_PROC_FS)
	20
	21	#if defined(CONFIG_INOTIFY_USER) \|\| defined(CONFIG_FANOTIFY)
	22
	23	static int show_fdinfo(struct seq_file m, struct file f,
	24	int (show)(struct seq_file m, struct fsnotify_mark *mark))
	25	{
	26	struct fsnotify_group *group = f->private_data;
	27	struct fsnotify_mark *mark;
	28	int ret = 0;
	29
	30	spin_lock(&group->mark_lock);
	31	list_for_each_entry(mark, &group->marks_list, g_list) {
	32	ret = show(m, mark);
	33	if (ret)
	34	break;
	35	}
	36	spin_unlock(&group->mark_lock);
	37	return ret;
	38	}
	39
	40	#if defined(CONFIG_EXPORTFS)
	41	static int show_mark_fhandle(struct seq_file m, struct inode inode)
	42	{
	43	struct {
	44	struct file_handle handle;
	45	u8 pad[64];
	46	} f;
	47	int size, ret, i;
	48
	49	f.handle.handle_bytes = sizeof(f.pad);
	50	size = f.handle.handle_bytes >> 2;
	51
	52	ret = exportfs_encode_inode_fh(inode, (struct fid *)f.handle.f_handle, &size, 0);
	53	if ((ret == 255) \|\| (ret == -ENOSPC)) {
	54	WARN_ONCE(1, "Can't encode file handler for inotify: %d\n", ret);
	55	return 0;
	56	}
	57
	58	f.handle.handle_type = ret;
	59	f.handle.handle_bytes = size * sizeof(u32);
	60
	61	ret = seq_printf(m, "fhandle-bytes:%x fhandle-type:%x f_handle:",
	62	f.handle.handle_bytes, f.handle.handle_type);
	63
	64	for (i = 0; i < f.handle.handle_bytes; i++)
65	ret \|= seq_printf(m, "%02x", (int)f.handle.f_handle[i]);
66
67	return ret;
68	}
69	#else
70	static int show_mark_fhandle(struct seq_file m, struct inode inode)
71	{
72	return 0;
73	}
74	#endif
75
76	#ifdef CONFIG_INOTIFY_USER
77
78	static int inotify_fdinfo(struct seq_file m, struct fsnotify_mark mark)
79	{
80	struct inotify_inode_mark *inode_mark;
81	struct inode *inode;
82	int ret = 0;
83
84	if (!(mark->flags & (FSNOTIFY_MARK_FLAG_ALIVE \| FSNOTIFY_MARK_FLAG_INODE)))
85	return 0;
86
87	inode_mark = container_of(mark, struct inotify_inode_mark, fsn_mark);
88	inode = igrab(mark->i.inode);
89	if (inode) {
90	ret = seq_printf(m, "inotify wd:%x ino:%lx sdev:%x "
91	"mask:%x ignored_mask:%x ",
92	inode_mark->wd, inode->i_ino,
93	inode->i_sb->s_dev,
94	mark->mask, mark->ignored_mask);
95	ret \|= show_mark_fhandle(m, inode);
96	ret \|= seq_putc(m, '\n');
97	iput(inode);
98	}
99
100	return ret;
101	}
102
103	int inotify_show_fdinfo(struct seq_file m, struct file f)
104	{
105	return show_fdinfo(m, f, inotify_fdinfo);
106	}
107
108	#endif /* CONFIG_INOTIFY_USER */
109
110	#ifdef CONFIG_FANOTIFY
111
112	static int fanotify_fdinfo(struct seq_file m, struct fsnotify_mark mark)
113	{
114	struct inode *inode;
115	int ret = 0;
116
117	if (!(mark->flags & FSNOTIFY_MARK_FLAG_ALIVE))
118	return 0;
119
120	if (mark->flags & FSNOTIFY_MARK_FLAG_INODE) {
121	inode = igrab(mark->i.inode);
122	if (!inode)
123	goto out;
124	ret = seq_printf(m, "fanotify ino:%lx sdev:%x "
125	"mask:%x ignored_mask:%x ",
126	inode->i_ino, inode->i_sb->s_dev,
127	mark->mask, mark->ignored_mask);
128	ret \|= show_mark_fhandle(m, inode);
129	ret \|= seq_putc(m, '\n');
130	iput(inode);
131	} else if (mark->flags & FSNOTIFY_MARK_FLAG_VFSMOUNT) {
132	struct mount *mnt = real_mount(mark->m.mnt);
133
134	ret = seq_printf(m, "fanotify mnt_id:%x mask:%x "
135	"ignored_mask:%x\n",
136	mnt->mnt_id, mark->mask, mark->ignored_mask);
137	}
138	out:
139	return ret;
140	}
141
142	int fanotify_show_fdinfo(struct seq_file m, struct file f)
143	{
144	struct fsnotify_group *group = f->private_data;
145	unsigned int flags = 0;
146
147	switch (group->priority) {
148	case FS_PRIO_0:
149	flags \|= FAN_CLASS_NOTIF;
150	break;
151	case FS_PRIO_1:
152	flags \|= FAN_CLASS_CONTENT;
153	break;
154	case FS_PRIO_2:
155	flags \|= FAN_CLASS_PRE_CONTENT;
156	break;
157	}
158
159	if (group->max_events == UINT_MAX)
160	flags \|= FAN_UNLIMITED_QUEUE;
161
162	if (group->fanotify_data.max_marks == UINT_MAX)
163	flags \|= FAN_UNLIMITED_MARKS;
164
165	seq_printf(m, "fanotify flags:%x event-flags:%x\n",
166	flags, group->fanotify_data.f_flags);
167
168	return show_fdinfo(m, f, fanotify_fdinfo);
169	}
170
171	#endif /* CONFIG_FANOTIFY */
172
173	#endif /* CONFIG_INOTIFY_USER \|\| CONFIG_FANOTIFY */
174
175	#endif /* CONFIG_PROC_FS */