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CIFS: Fix persistent handles re-opening on reconnect 

openFileList of tcon can be changed while cifs_reopen_file() is called
that can lead to an unexpected behavior when we return to the loop.
Fix this by introducing a temp list for keeping all file handles that
need to be reopen.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2016-10-07 17:26:36 -07:00 committed by Steve French
parent 166cea4dc3
commit f2cca6a7c9
2 changed files with 18 additions and 5 deletions
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1
fs/cifs/cifsglob.h
View File

@ -1065,6 +1065,7 @@ struct cifsFileInfo {
kuid_t uid; /* allows finding which FileInfo structure */
__u32 pid; /* process id who opened file */
struct cifs_fid fid; /* file id from remote */
struct list_head rlist; /* reconnect list */
/* BB add lock scope info here if needed */ ;
/* lock scope id (0 if none) */
struct dentry *dentry;

22
fs/cifs/file.c
View File

@ -763,19 +763,31 @@ int cifs_close(struct inode *inode, struct file *file)
void
cifs_reopen_persistent_handles(struct cifs_tcon *tcon)
{
struct cifsFileInfo *open_file = NULL;
struct cifsFileInfo *open_file;
struct list_head *tmp;
struct list_head *tmp1;
struct list_head tmp_list;
cifs_dbg(FYI, "Reopen persistent handles");
INIT_LIST_HEAD(&tmp_list);
/* list all files open on tree connection, reopen resilient handles */
spin_lock(&tcon->open_file_lock);
list_for_each_safe(tmp, tmp1, &tcon->openFileList) {
list_for_each(tmp, &tcon->openFileList) {
open_file = list_entry(tmp, struct cifsFileInfo, tlist);
spin_unlock(&tcon->open_file_lock);
cifs_reopen_file(open_file, false /* do not flush */);
spin_lock(&tcon->open_file_lock);
if (!open_file->invalidHandle)
continue;
cifsFileInfo_get(open_file);
list_add_tail(&open_file->rlist, &tmp_list);
}
spin_unlock(&tcon->open_file_lock);
list_for_each_safe(tmp, tmp1, &tmp_list) {
open_file = list_entry(tmp, struct cifsFileInfo, rlist);
cifs_reopen_file(open_file, false /* do not flush */);
list_del_init(&open_file->rlist);
cifsFileInfo_put(open_file);
}
}
int cifs_closedir(struct inode *inode, struct file *file)