procfs/dmabuf: add inode number to /proc/*/fdinfo

And 'ino' field to /proc/<pid>/fdinfo/<FD> and
/proc/<pid>/task/<tid>/fdinfo/<FD>.

The inode numbers can be used to uniquely identify DMA buffers in user
space and avoids a dependency on /proc/<pid>/fd/* when accounting
per-process DMA buffer sizes.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Kalesh Singh <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Acked-by: Christian König <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Jeff Vander Stoep <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Suren Baghdasaryan <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Hridya Valsaraju <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Kalesh Singh <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Alexey Gladkov <[email protected]>
Cc: Szabolcs Nagy <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Michel Lespinasse <[email protected]>
Cc: Bernd Edlinger <[email protected]>
Cc: Andrei Vagin <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: James Morris <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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