orangefs: fix deadlock; do not write i_size in read_iter

After do_readv_writev, the inode cache is invalidated anyway, so i_size
will never be read.  It will be fetched from the server which will also
know about updates from other machines.

Fixes deadlock on 32-bit SMP.

See https://marc.info/?l=linux-fsdevel&m=151268557427760&w=2

Signed-off-by: Martin Brandenburg <martin@omnibond.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Mike Marshall <hubcap@omnibond.com>
Cc: stable@vger.kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 2 insertions, 16 deletions

diff --git a/fs/orangefs/file.c b/fs/orangefs/file.c
index 1668fd645c45..0d228cd087e6 100644
--- a/fs/orangefs/file.c
+++ b/fs/orangefs/file.c
@@ -452,7 +452,7 @@ ssize_t orangefs_inode_read(struct inode *inode,
 static ssize_t orangefs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
 {
         struct file *file = iocb->ki_filp;
-        loff_t pos = *(&iocb->ki_pos);
+        loff_t pos = iocb->ki_pos;
         ssize_t rc = 0;
 
         BUG_ON(iocb->private);
@@ -492,9 +492,6 @@ static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *ite
                 }
         }
 
-        if (file->f_pos > i_size_read(file->f_mapping->host))
-                orangefs_i_size_write(file->f_mapping->host, file->f_pos);
-
         rc = generic_write_checks(iocb, iter);
 
         if (rc <= 0) {
@@ -508,7 +505,7 @@ static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *ite
          * pos to the end of the file, so we will wait till now to set
          * pos...
          */
-        pos = *(&iocb->ki_pos);
+        pos = iocb->ki_pos;
 
         rc = do_readv_writev(ORANGEFS_IO_WRITE,
                              file,
diff --git a/fs/orangefs/orangefs-kernel.h b/fs/orangefs/orangefs-kernel.h
index 97adf7d100b5..2595453fe737 100644
--- a/fs/orangefs/orangefs-kernel.h
+++ b/fs/orangefs/orangefs-kernel.h
@@ -533,17 +533,6 @@ do {									\
         sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE;                  \
 } while (0)
 
-static inline void orangefs_i_size_write(struct inode *inode, loff_t i_size)
-{
-#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
-        inode_lock(inode);
-#endif
-        i_size_write(inode, i_size);
-#if BITS_PER_LONG == 32 && defined(CONFIG_SMP)
-        inode_unlock(inode);
-#endif
-}
-
 static inline void orangefs_set_timeout(struct dentry *dentry)
 {
         unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;