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  • Cyrill Gorcunov's avatar
    fs, notify: add procfs fdinfo helper · be77196b
    Cyrill Gorcunov authored
    
    
    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:	04002
     | fanotify flags:10 event-flags:0
     | fanotify mnt_id:12 mask:3b ignored_mask:0
     | fanotify ino:50205 sdev:800013 mask:3b ignored_mask:40000000 fhandle-bytes:8 fhandle-type:1 f_handle:05020500fb1d47e7
    
    To minimize impact on general fsnotify code the new functionality
    is gathered in fs/notify/fdinfo.c file.
    
    Signed-off-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
    Acked-by: default avatarPavel Emelyanov <xemul@parallels.com>
    Cc: Oleg Nesterov <oleg@redhat.com>
    Cc: Andrey Vagin <avagin@openvz.org>
    Cc: Al Viro <viro@ZenIV.linux.org.uk>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: James Bottomley <jbottomley@parallels.com>
    Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: Matthew Helsley <matt.helsley@gmail.com>
    Cc: "J. Bruce Fields" <bfields@fieldses.org>
    Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
    Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    be77196b