On Mon, 12 Nov 2012 14:14:44 +0400
Cyrill Gorcunov <gorcu...@openvz.org> wrote:
> This allow us to print out fsnotify details such as
> watchee inode, device, mask and optionally a file handle.
>
> For inotify objects if kernel compiled with exportfs support
> the output will be
>
> | 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
>
> If kernel compiled without exportfs support, the file handle
> won't be provided but inode and device only.
>
> | pos: 0
> | flags: 02000000
> | inotify wd: 3 ino: 9e7e sdev: 800013 mask: 800afce
> ignored_mask: 0
> | inotify wd: 2 ino: a111 sdev: 800013 mask: 800afce
> ignored_mask: 0
> | inotify wd: 1 ino: 6b149 sdev: 800013 mask: 800afce
> ignored_mask: 0
>
> For fanotify the output is like
>
> | pos: 0
> | flags: 02
> | fanotify ino: 68f71 sdev: 800013 mask: 1 ignored_mask:
> 40000000
> | 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.
>
>
> ...
>
> --- /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
#else /* CONFIG_PROC_FS */
#define inotify_show_fdinfo NULL
#define fanotify_show_fdinfo NULL
#endif /* CONFIG_PROC_FS */
> +
>
> ...
>
> @@ -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,
> @@ -427,6 +428,9 @@ 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,
Then remove these ifdefs.
That's if you can be bothered. It's a bit of a party trick which
doesn't make things much clearer IMO.
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