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[CIFS] lseek polling returned stale EOF

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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
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@ -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 */ /* origin == SEEK_END => we must revalidate the cached file length */
if (origin == SEEK_END) { 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) if (retval < 0)
return (loff_t)retval; return (loff_t)retval;
} }