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| author | Hunter Adrian <adrian.hunter@nokia.com> | 2009-05-14 00:32:30 -0400 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2009-05-19 04:01:31 -0400 |
| commit | 8b3884a841f398f6e0a0411d6929d8d9381bb265 (patch) | |
| tree | 01bbbaad779c43b14ea3e809c5fc9271eca257d4 /Documentation/tomoyo.txt | |
| parent | 6d6cb0d688d0f262cb4fd5771648b0ac01d4f82c (diff) | |
UBIFS: return error if link and unlink race
Consider a scenario when 'vfs_link(dirA/fileA)' and
'vfs_unlink(dirA/fileA, dirB/fileB)' race. 'vfs_link()' does not
lock 'dirA->i_mutex', so this is possible. Both of the functions
lock 'fileA->i_mutex' though. Suppose 'vfs_unlink()' wins, and takes
'fileA->i_mutex' mutex first. Suppose 'fileA->i_nlink' is 1. In this
case 'ubifs_unlink()' will drop the last reference, and put 'inodeA'
to the list of orphans. After this, 'vfs_link()' will link
'dirB/fileB' to 'inodeA'. Thir is a problem because, for example,
the subsequent 'vfs_unlink(dirB/fileB)' will add the same inode
to the list of orphans.
This problem was reported by J. R. Okajima <hooanon05@yahoo.co.jp>
[Artem: add more comments, amended commit message]
Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'Documentation/tomoyo.txt')
0 files changed, 0 insertions, 0 deletions