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Subject[patch 5/8] fs, notify: Add procfs fdinfo helper v3
This allow us to print out fsnotify details such as
watchee inode, device, mask and file handle.

For example for inotify objects the output is

| pos: 0
| flags: 02000000
| inotify wd: 3 ino: 9e7e sdev: 800013 mask: 800afce ignored_mask: 0 fhandle-bytes: 8 fhandle-type: 1 f_handle: 7e9e0000640d1b6d
| inotify wd: 2 ino: a111 sdev: 800013 mask: 800afce ignored_mask: 0 fhandle-bytes: 8 fhandle-type: 1 f_handle: 11a1000020542153
| inotify wd: 1 ino: 6b149 sdev: 800013 mask: 800afce ignored_mask: 0 fhandle-bytes: 8 fhandle-type: 1 f_handle: 49b1060023552153

For fanotify it is like

| pos: 0
| flags: 02
| fanotify ino: 68f71 sdev: 800013 mask: 1 ignored_mask: 40000000 fhandle-bytes: 8 fhandle-type: 1 f_handle: 718f0600b9f42053
| fanotify mnt_id: 13 mask: 1 ignored_mask: 40000000

To minimize impact on general fsnotify code the new functionality
is gathered in fs/notify/fdinfo.c file.

v2:
- append missing colons to terms
v3:
- continue from pervious position in list on ->next

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: Pavel Emelyanov <xemul@parallels.com>
CC: Al Viro <viro@ZenIV.linux.org.uk>
CC: Alexey Dobriyan <adobriyan@gmail.com>
CC: Andrew Morton <akpm@linux-foundation.org>
CC: James Bottomley <jbottomley@parallels.com>
---
fs/notify/Makefile | 2
fs/notify/fanotify/fanotify_user.c | 4
fs/notify/fdinfo.c | 167 +++++++++++++++++++++++++++++++++++++
fs/notify/fdinfo.h | 22 ++++
fs/notify/inotify/inotify_user.c | 4
5 files changed, 198 insertions(+), 1 deletion(-)

Index: linux-2.6.git/fs/notify/Makefile
===================================================================
--- linux-2.6.git.orig/fs/notify/Makefile
+++ linux-2.6.git/fs/notify/Makefile
@@ -1,5 +1,5 @@
obj-$(CONFIG_FSNOTIFY) += fsnotify.o notification.o group.o inode_mark.o \
- mark.o vfsmount_mark.o
+ mark.o vfsmount_mark.o fdinfo.o

obj-y += dnotify/
obj-y += inotify/
Index: linux-2.6.git/fs/notify/fanotify/fanotify_user.c
===================================================================
--- linux-2.6.git.orig/fs/notify/fanotify/fanotify_user.c
+++ linux-2.6.git/fs/notify/fanotify/fanotify_user.c
@@ -17,6 +17,7 @@
#include <asm/ioctls.h>

#include "../../mount.h"
+#include "../fdinfo.h"

#define FANOTIFY_DEFAULT_MAX_EVENTS 16384
#define FANOTIFY_DEFAULT_MAX_MARKS 8192
@@ -446,6 +447,9 @@ static long fanotify_ioctl(struct file *
}

static const struct file_operations fanotify_fops = {
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = fanotify_show_fdinfo,
+#endif
.poll = fanotify_poll,
.read = fanotify_read,
.write = fanotify_write,
Index: linux-2.6.git/fs/notify/fdinfo.c
===================================================================
--- /dev/null
+++ linux-2.6.git/fs/notify/fdinfo.c
@@ -0,0 +1,167 @@
+#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/kernel.h>
+#include <linux/namei.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/seq_file.h>
+#include <linux/exportfs.h>
+#include <linux/proc_fs.h>
+
+#include "inotify/inotify.h"
+#include "../fs/mount.h"
+
+struct inode_file_handle {
+ struct file_handle h;
+ struct fid fid;
+} __packed;
+
+#if defined(CONFIG_PROC_FS)
+
+#if defined(CONFIG_INOTIFY_USER) || defined(CONFIG_FANOTIFY)
+
+#ifdef CONFIG_EXPORTFS
+static int inotify_encode_target(struct inode *inode, struct inode_file_handle *fhandle)
+{
+ int ret, size;
+
+ size = sizeof(fhandle->fid) >> 2;
+ ret = export_encode_inode_fh(inode, &fhandle->fid, &size);
+ BUG_ON(ret != FILEID_INO32_GEN);
+
+ fhandle->h.handle_type = FILEID_INO32_GEN;
+ fhandle->h.handle_bytes = size * sizeof(u32);
+
+ return 0;
+}
+#else
+static int inotify_encode_target(struct inode *inode, struct inode_file_handle *fhandle)
+{
+ fhandle->h.handle_type = FILEID_ROOT;
+ fhandle->h.handle_bytes = 0;
+ return 0;
+}
+#endif /* CONFIG_EXPORTFS */
+
+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;
+}
+
+#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) {
+ struct inode_file_handle fhandle;
+ int i;
+
+ inotify_encode_target(inode, &fhandle);
+
+ ret = seq_printf(m, "inotify wd: %8d ino: %16lx sdev: %8x "
+ "mask: %8x ignored_mask: %8x "
+ "fhandle-bytes: %8x fhandle-type: %8x f_handle: ",
+ inode_mark->wd, inode->i_ino,
+ inode->i_sb->s_dev,
+ mark->mask,
+ mark->ignored_mask,
+ fhandle.h.handle_bytes,
+ fhandle.h.handle_type);
+ for (i = 0; i < fhandle.h.handle_bytes; i++) {
+ ret |= seq_printf(m, "%02x",
+ (int)(unsigned char)fhandle.h.f_handle[i]);
+ }
+ 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) {
+ struct inode_file_handle fhandle;
+ int i;
+
+ inode = igrab(mark->i.inode);
+ if (!inode)
+ goto out;
+ inotify_encode_target(inode, &fhandle);
+
+ ret = seq_printf(m, "fanotify ino: %16lx sdev: %8x "
+ "mask: %8x ignored_mask: %8x "
+ "fhandle-bytes: %8x fhandle-type: %8x f_handle: ",
+ inode->i_ino,
+ inode->i_sb->s_dev,
+ mark->mask,
+ mark->ignored_mask,
+ fhandle.h.handle_bytes,
+ fhandle.h.handle_type);
+
+ for (i = 0; i < fhandle.h.handle_bytes; i++) {
+ ret |= seq_printf(m, "%02x",
+ (int)(unsigned char)fhandle.h.f_handle[i]);
+ }
+ 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: %8x mask: %8x ignored_mask: %8x\n",
+ mnt->mnt_id, mark->mask, mark->ignored_mask);
+ }
+out:
+ return ret;
+}
+
+int fanotify_show_fdinfo(struct seq_file *m, struct file *f)
+{
+ return show_fdinfo(m, f, fanotify_fdinfo);
+}
+
+#endif /* CONFIG_FANOTIFY */
+
+#endif /* CONFIG_INOTIFY_USER || CONFIG_FANOTIFY */
+
+#endif /* CONFIG_PROC_FS */
Index: linux-2.6.git/fs/notify/fdinfo.h
===================================================================
--- /dev/null
+++ linux-2.6.git/fs/notify/fdinfo.h
@@ -0,0 +1,22 @@
+#ifndef __FSNOTIFY_FDINFO_H__
+#define __FSNOTIFY_FDINFO_H__
+
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+
+struct seq_file;
+struct file;
+
+#ifdef CONFIG_PROC_FS
+
+#ifdef CONFIG_INOTIFY_USER
+extern int inotify_show_fdinfo(struct seq_file *m, struct file *f);
+#endif
+
+#ifdef CONFIG_FANOTIFY
+extern int fanotify_show_fdinfo(struct seq_file *m, struct file *f);
+#endif
+
+#endif /* CONFIG_PROC_FS */
+
+#endif /* __FSNOTIFY_FDINFO_H__ */
Index: linux-2.6.git/fs/notify/inotify/inotify_user.c
===================================================================
--- linux-2.6.git.orig/fs/notify/inotify/inotify_user.c
+++ linux-2.6.git/fs/notify/inotify/inotify_user.c
@@ -40,6 +40,7 @@
#include <linux/wait.h>

#include "inotify.h"
+#include "../fdinfo.h"

#include <asm/ioctls.h>

@@ -335,6 +336,9 @@ static long inotify_ioctl(struct file *f
}

static const struct file_operations inotify_fops = {
+#ifdef CONFIG_PROC_FS
+ .show_fdinfo = inotify_show_fdinfo,
+#endif
.poll = inotify_poll,
.read = inotify_read,
.fasync = inotify_fasync,


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