Commit 6793f1c4 authored by Martin Brandenburg's avatar Martin Brandenburg Committed by Linus Torvalds

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=2Signed-off-by: default avatarMartin 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: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 6e20630e
...@@ -452,7 +452,7 @@ ssize_t orangefs_inode_read(struct inode *inode, ...@@ -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) static ssize_t orangefs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
{ {
struct file *file = iocb->ki_filp; struct file *file = iocb->ki_filp;
loff_t pos = *(&iocb->ki_pos); loff_t pos = iocb->ki_pos;
ssize_t rc = 0; ssize_t rc = 0;
BUG_ON(iocb->private); BUG_ON(iocb->private);
...@@ -492,9 +492,6 @@ static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *ite ...@@ -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); rc = generic_write_checks(iocb, iter);
if (rc <= 0) { if (rc <= 0) {
...@@ -508,7 +505,7 @@ static ssize_t orangefs_file_write_iter(struct kiocb *iocb, struct iov_iter *ite ...@@ -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 to the end of the file, so we will wait till now to set
* pos... * pos...
*/ */
pos = *(&iocb->ki_pos); pos = iocb->ki_pos;
rc = do_readv_writev(ORANGEFS_IO_WRITE, rc = do_readv_writev(ORANGEFS_IO_WRITE,
file, file,
......
...@@ -533,17 +533,6 @@ do { \ ...@@ -533,17 +533,6 @@ do { \
sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE; \ sys_attr.mask = ORANGEFS_ATTR_SYS_ALL_SETABLE; \
} while (0) } 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) static inline void orangefs_set_timeout(struct dentry *dentry)
{ {
unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000; unsigned long time = jiffies + orangefs_dcache_timeout_msecs*HZ/1000;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment