cifs: have cifsFileInfo hold a reference to a tlink rather than tcon pointer
cifsFileInfo needs a pointer to a tcon, but it doesn't currently hold a
reference to it. Change it to keep a pointer to a tcon_link instead and
hold a reference to it.
That will keep the tcon from being freed until the file is closed.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 1e375abc..24332d4 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -283,7 +283,7 @@
pCifsFile = cifs_new_fileinfo(inode, netfid, file,
file->f_path.mnt,
- tcon, oflags, oplock);
+ tlink, oflags, oplock);
if (pCifsFile == NULL) {
CIFSSMBClose(xid, tcon, netfid);
rc = -ENOMEM;
@@ -376,7 +376,7 @@
goto out;
pCifsFile = cifs_new_fileinfo(inode, netfid, file, file->f_path.mnt,
- tcon, file->f_flags, oplock);
+ tlink, file->f_flags, oplock);
if (pCifsFile == NULL) {
rc = -ENOMEM;
goto out;
@@ -468,7 +468,7 @@
}
cifs_sb = CIFS_SB(inode->i_sb);
- tcon = pCifsFile->tcon;
+ tcon = tlink_tcon(pCifsFile->tlink);
/* can not grab rename sem here because various ops, including
those that already have the rename sem can end up causing writepage
@@ -582,7 +582,7 @@
xid = GetXid();
cifs_sb = CIFS_SB(inode->i_sb);
- pTcon = pSMBFile->tcon;
+ pTcon = tlink_tcon(pSMBFile->tlink);
if (pSMBFile) {
struct cifsLockInfo *li, *tmp;
write_lock(&GlobalSMBSeslock);
@@ -660,7 +660,7 @@
xid = GetXid();
if (pCFileStruct) {
- struct cifsTconInfo *pTcon = pCFileStruct->tcon;
+ struct cifsTconInfo *pTcon = tlink_tcon(pCFileStruct->tlink);
cFYI(1, "Freeing private data in close dir");
write_lock(&GlobalSMBSeslock);
@@ -684,6 +684,7 @@
else
cifs_buf_release(ptmp);
}
+ cifs_put_tlink(pCFileStruct->tlink);
kfree(file->private_data);
file->private_data = NULL;
}
@@ -770,7 +771,7 @@
cFYI(1, "Unknown type of lock");
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
- tcon = ((struct cifsFileInfo *)file->private_data)->tcon;
+ tcon = tlink_tcon(((struct cifsFileInfo *)file->private_data)->tlink);
if (file->private_data == NULL) {
rc = -EBADF;
@@ -970,7 +971,7 @@
return -EBADF;
open_file = file->private_data;
- pTcon = open_file->tcon;
+ pTcon = tlink_tcon(open_file->tlink);
rc = generic_write_checks(file, poffset, &write_size, 0);
if (rc)
@@ -1071,7 +1072,7 @@
if (file->private_data == NULL)
return -EBADF;
open_file = file->private_data;
- pTcon = open_file->tcon;
+ pTcon = tlink_tcon(open_file->tlink);
xid = GetXid();
@@ -1393,7 +1394,7 @@
return generic_writepages(mapping, wbc);
}
- tcon = open_file->tcon;
+ tcon = tlink_tcon(open_file->tlink);
if (!experimEnabled && tcon->ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
cifsFileInfo_put(open_file);
@@ -1672,7 +1673,7 @@
if (rc == 0) {
rc = CIFS_I(inode)->write_behind_rc;
CIFS_I(inode)->write_behind_rc = 0;
- tcon = smbfile->tcon;
+ tcon = tlink_tcon(smbfile->tlink);
if (!rc && tcon && smbfile &&
!(CIFS_SB(inode->i_sb)->mnt_cifs_flags & CIFS_MOUNT_NOSSYNC))
rc = CIFSSMBFlush(xid, tcon, smbfile->netfid);
@@ -1764,7 +1765,7 @@
return rc;
}
open_file = file->private_data;
- pTcon = open_file->tcon;
+ pTcon = tlink_tcon(open_file->tlink);
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
cFYI(1, "attempting read on write only file instance");
@@ -1845,7 +1846,7 @@
return rc;
}
open_file = file->private_data;
- pTcon = open_file->tcon;
+ pTcon = tlink_tcon(open_file->tlink);
if ((file->f_flags & O_ACCMODE) == O_WRONLY)
cFYI(1, "attempting read on write only file instance");
@@ -1981,7 +1982,7 @@
}
open_file = file->private_data;
cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
- pTcon = open_file->tcon;
+ pTcon = tlink_tcon(open_file->tlink);
/*
* Reads as many pages as possible from fscache. Returns -ENOBUFS
@@ -2345,8 +2346,8 @@
* disconnected since oplock already released by the server
*/
if (!cfile->closePend && !cfile->oplock_break_cancelled) {
- rc = CIFSSMBLock(0, cfile->tcon, cfile->netfid, 0, 0, 0, 0,
- LOCKING_ANDX_OPLOCK_RELEASE, false);
+ rc = CIFSSMBLock(0, tlink_tcon(cfile->tlink), cfile->netfid, 0,
+ 0, 0, 0, LOCKING_ANDX_OPLOCK_RELEASE, false);
cFYI(1, "Oplock release rc = %d", rc);
}