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[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: Jeremy Allison <jra@samba.org>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French 2007-02-01 04:27:59 +00:00
parent 190ff5b3a1
commit 030e9d8147
1 changed files with 9 additions and 1 deletions
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10
fs/cifs/cifsfs.c
View File

@ -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;
}