Re: [patch 7/7] fs, notify: Add procfs fdinfo helper v6

[Pavel Emelyanov]

> 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.
> 
> Signed-off-by: Cyrill Gorcunov <gorcunov@xxxxxxxxxx>
> CC: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
> CC: Oleg Nesterov <oleg@xxxxxxxxxx>
> CC: Andrey Vagin <avagin@xxxxxxxxxx>
> CC: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> CC: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> CC: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> CC: James Bottomley <jbottomley@xxxxxxxxxxxxx>
> CC: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> CC: Alexey Dobriyan <adobriyan@xxxxxxxxx>
> CC: Matthew Helsley <matt.helsley@xxxxxxxxx>
> CC: "J. Bruce Fields" <bfields@xxxxxxxxxxxx>
> CC: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> CC: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxx>

Acked-by: Pavel Emelyanov <xemul@xxxxxxxxxxxxx>
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