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| author | Amir Goldstein | 2018-06-08 02:07:15 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2018-06-08 02:34:36 +0200 |
| commit | 12ba780d64f6c96d40de9c4d1468fb732e64be4c (patch) | |
| tree | e2761c1591c03a7268632f05c04e07568b01e58c /mm/backing-dev.c | |
| parent | mm/ksm: move [set_]page_stable_node from ksm.h to ksm.c (diff) | |
| download | kernel-qcow2-linux-12ba780d64f6c96d40de9c4d1468fb732e64be4c.tar.gz kernel-qcow2-linux-12ba780d64f6c96d40de9c4d1468fb732e64be4c.tar.xz kernel-qcow2-linux-12ba780d64f6c96d40de9c4d1468fb732e64be4c.zip | |
tmpfs: allow decoding a file handle of an unlinked file
tmpfs uses the helper d_find_alias() to find a dentry from a decoded
inode, but d_find_alias() skips unhashed dentries, so unlinked files
cannot be decoded from a file handle.
This can be reproduced using xfstests test program open_by_handle:
$ open_by handle -c /tmp/testdir
$ open_by_handle -dk /tmp/testdir
open_by_handle(/tmp/testdir/file000000) returned 116 incorrectly on an unlinked open file!
To fix this, if d_find_alias() can't find a hashed alias, call
d_find_any_alias() to return an unhashed one.
Link: http://lkml.kernel.org/r/CAOQ4uxg+qSLP0KwdW+h1tcPqOCQd+_pGZVXiePQB1TXCMBMctQ@mail.gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jeff Layton <jlayton@poochiereds.net>
Cc: "J. Bruce Fields" <bfields@fieldses.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/backing-dev.c')
0 files changed, 0 insertions, 0 deletions