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fuse: update mtime on open(O_TRUNC) in atomic_o_trunc mode 

In case of fc->atomic_o_trunc is set, fuse does nothing in
fuse_do_setattr() while handling open(O_TRUNC). Hence, i_mtime must be
updated explicitly in fuse_finish_open(). The patch also adds extra locking
encompassing open(O_TRUNC) operation to avoid races between the truncation
and updating i_mtime.

Signed-off-by: Maxim Patlasov <MPatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Maxim Patlasov 2014-04-28 14:19:22 +02:00 committed by Miklos Szeredi
parent 009dd694e8
commit 75caeecdf9
1 changed files with 14 additions and 4 deletions
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18
fs/fuse/file.c
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@ -223,6 +223,8 @@ void fuse_finish_open(struct inode *inode, struct file *file)
i_size_write(inode, 0);
spin_unlock(&fc->lock);
fuse_invalidate_attr(inode);
if (fc->writeback_cache)
file_update_time(file);
}
if ((file->f_mode & FMODE_WRITE) && fc->writeback_cache)
fuse_link_write_file(file);
@ -232,18 +234,26 @@ int fuse_open_common(struct inode *inode, struct file *file, bool isdir)
{
struct fuse_conn *fc = get_fuse_conn(inode);
int err;
bool lock_inode = (file->f_flags & O_TRUNC) &&
fc->atomic_o_trunc &&
fc->writeback_cache;
err = generic_file_open(inode, file);
if (err)
return err;
if (lock_inode)
mutex_lock(&inode->i_mutex);
err = fuse_do_open(fc, get_node_id(inode), file, isdir);
if (err)
return err;
fuse_finish_open(inode, file);
if (!err)
fuse_finish_open(inode, file);
return 0;
if (lock_inode)
mutex_unlock(&inode->i_mutex);
return err;
}
static void fuse_prepare_release(struct fuse_file *ff, int flags, int opcode)