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| author | Al Viro <viro@zeniv.linux.org.uk> | 2014-09-04 15:38:11 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2014-09-04 21:37:41 +0200 |
| commit | b231509616feb911c2a7a8814d58c0014ef5b17f (patch) | |
| tree | da9d231b09ee58637fb671310291432929c9db56 /fs/fs_struct.c | |
| parent | udf: merge the pieces inserting a new non-directory object into directory (diff) | |
| download | linux-b231509616feb911c2a7a8814d58c0014ef5b17f.tar.xz linux-b231509616feb911c2a7a8814d58c0014ef5b17f.zip | |
udf: fix the udf_iget() vs. udf_new_inode() races
Currently udf_iget() (triggered by NFS) can race with udf_new_inode()
leading to two inode structures with the same inode number:
nfsd: iget_locked() creates inode
nfsd: try to read from disk, block on that.
udf_new_inode(): allocate inode with that inumber
udf_new_inode(): insert it into icache, set it up and dirty
udf_write_inode(): write inode into buffer cache
nfsd: get CPU again, look into buffer cache, see nice and sane on-disk
inode, set the in-core inode from it
Fix the problem by putting inode into icache in locked state (I_NEW set)
and unlocking it only after it's fully set up.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/fs_struct.c')
0 files changed, 0 insertions, 0 deletions