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| author | Jeff Layton <jlayton@poochiereds.net> | 2014-05-23 06:50:21 -0400 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2014-06-19 13:34:04 -0500 |
| commit | 08bc03539d38508eff3fd470a82ea422ce279f6e (patch) | |
| tree | 8ccfdec6410f15e33ed4e42b748ed773aaa55632 /fs/cifs/cifsfs.c | |
| parent | a1d0b84c308d7fdfb67eb76498116a6c2fdda507 (diff) | |
| download | linux-08bc03539d38508eff3fd470a82ea422ce279f6e.tar.gz linux-08bc03539d38508eff3fd470a82ea422ce279f6e.tar.bz2 linux-08bc03539d38508eff3fd470a82ea422ce279f6e.zip | |
cifs: revalidate mapping prior to satisfying read_iter request with cache=loose
Before satisfying a read with cache=loose, we should always check
that the pagecache is valid before allowing a read to be satisfied
out of it.
Reported-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Jeff Layton <jlayton@poochiereds.net>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/cifsfs.c')
| -rw-r--r-- | fs/cifs/cifsfs.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index 2c90d07c0b3a..888398067420 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -725,6 +725,19 @@ out_nls: goto out; } +static ssize_t +cifs_loose_read_iter(struct kiocb *iocb, struct iov_iter *iter) +{ + ssize_t rc; + struct inode *inode = file_inode(iocb->ki_filp); + + rc = cifs_revalidate_mapping(inode); + if (rc) + return rc; + + return generic_file_read_iter(iocb, iter); +} + static ssize_t cifs_file_write_iter(struct kiocb *iocb, struct iov_iter *from) { struct inode *inode = file_inode(iocb->ki_filp); @@ -881,7 +894,7 @@ const struct inode_operations cifs_symlink_inode_ops = { const struct file_operations cifs_file_ops = { .read = new_sync_read, .write = new_sync_write, - .read_iter = generic_file_read_iter, + .read_iter = cifs_loose_read_iter, .write_iter = cifs_file_write_iter, .open = cifs_open, .release = cifs_close, @@ -939,7 +952,7 @@ const struct file_operations cifs_file_direct_ops = { const struct file_operations cifs_file_nobrl_ops = { .read = new_sync_read, .write = new_sync_write, - .read_iter = generic_file_read_iter, + .read_iter = cifs_loose_read_iter, .write_iter = cifs_file_write_iter, .open = cifs_open, .release = cifs_close, |