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Commit 030e9d81 authored by Steve French's avatar Steve French
Browse files

[CIFS] lseek polling returned stale EOF 



Fixes Samba bug 4362

Discovered by Jeremy Allison

Clipper database polls on EOF via lseek and can get stale EOF
when file is open on different client

Signed-off-by: default avatarJeremy Allison <jra@samba.org>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent 190ff5b3

fs/cifs/cifsfs.c

+9 −1
Original line number Diff line number Diff line
@@ -511,7 +511,15 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int origin) 
{

	/* origin == SEEK_END => we must revalidate the cached file length */

	if (origin == SEEK_END) {

		int retval = cifs_revalidate(file->f_path.dentry);

		int retval;



		/* some applications poll for the file length in this strange

		   way so we must seek to end on non-oplocked files by

		   setting the revalidate time to zero */

		if(file->f_path.dentry->d_inode)		

			CIFS_I(file->f_path.dentry->d_inode)->time = 0;



		retval = cifs_revalidate(file->f_path.dentry);

		if (retval < 0)

			return (loff_t)retval;

	}