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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>
This commit is contained in:
Jeff Layton 2010-09-29 19:51:11 -04:00 committed by Steve French
parent 7ffec37245
commit 13cfb7334e
9 changed files with 41 additions and 33 deletions
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3
fs/cifs/cifsfs.c
View File

@ -595,7 +595,8 @@ static int cifs_setlease(struct file *file, long arg, struct file_lock **lease)
((arg == F_WRLCK) &&
(CIFS_I(inode)->clientCanCacheAll)))
return generic_setlease(file, arg, lease);
else if (cfile->tcon->local_lease && !CIFS_I(inode)->clientCanCacheRead)
else if (tlink_tcon(cfile->tlink)->local_lease &&
!CIFS_I(inode)->clientCanCacheRead)
/* If the server claims to support oplock on this
file, then we still need to check oplock even
if the local_lease mount option is set, but there

9
fs/cifs/cifsglob.h
View File

@ -341,6 +341,12 @@ cifs_put_tlink(struct tcon_link *tlink)
return;
}
static inline struct tcon_link *
cifs_get_tlink(struct tcon_link *tlink)
{
return tlink;
}
/* This function is always expected to succeed */
static inline struct cifsTconInfo *
cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
@ -389,7 +395,7 @@ struct cifsFileInfo {
struct file *pfile; /* needed for writepage */
struct inode *pInode; /* needed for oplock break */
struct vfsmount *mnt;
struct cifsTconInfo *tcon;
struct tcon_link *tlink;
struct mutex lock_mutex;
struct list_head llist; /* list of byte range locks we have. */
bool closePend:1; /* file is marked to close */
@ -411,6 +417,7 @@ static inline void cifsFileInfo_get(struct cifsFileInfo *cifs_file)
static inline void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
{
if (atomic_dec_and_test(&cifs_file->count)) {
cifs_put_tlink(cifs_file->tlink);
iput(cifs_file->pInode);
kfree(cifs_file);
}

2
fs/cifs/cifsproto.h
View File

@ -107,7 +107,7 @@ extern struct timespec cnvrtDosUnixTm(__le16 le_date, __le16 le_time,
extern struct cifsFileInfo *cifs_new_fileinfo(struct inode *newinode,
__u16 fileHandle, struct file *file,
struct vfsmount *mnt, struct cifsTconInfo *tcon,
struct vfsmount *mnt, struct tcon_link *tlink,
unsigned int oflags, __u32 oplock);
extern int cifs_posix_open(char *full_path, struct inode **pinode,
struct super_block *sb,

10
fs/cifs/dir.c
View File

@ -132,7 +132,7 @@ cifs_bp_rename_retry:
struct cifsFileInfo *
cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file,
struct vfsmount *mnt, struct cifsTconInfo *tcon,
struct vfsmount *mnt, struct tcon_link *tlink,
unsigned int oflags, __u32 oplock)
{
struct cifsFileInfo *pCifsFile;
@ -149,7 +149,7 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file,
pCifsFile->pfile = file;
pCifsFile->invalidHandle = false;
pCifsFile->closePend = false;
pCifsFile->tcon = tcon;
pCifsFile->tlink = cifs_get_tlink(tlink);
mutex_init(&pCifsFile->fh_mutex);
mutex_init(&pCifsFile->lock_mutex);
INIT_LIST_HEAD(&pCifsFile->llist);
@ -157,7 +157,7 @@ cifs_new_fileinfo(struct inode *newinode, __u16 fileHandle, struct file *file,
INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
write_lock(&GlobalSMBSeslock);
list_add(&pCifsFile->tlist, &tcon->openFileList);
list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
pCifsInode = CIFS_I(newinode);
if (pCifsInode) {
/* if readable file instance put first in list*/
@ -483,7 +483,7 @@ cifs_create_set_dentry:
}
pfile_info = cifs_new_fileinfo(newinode, fileHandle, filp,
nd->path.mnt, tcon, oflags,
nd->path.mnt, tlink, oflags,
oplock);
if (pfile_info == NULL) {
fput(filp);
@ -758,7 +758,7 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
}
cfile = cifs_new_fileinfo(newInode, fileHandle, filp,
nd->path.mnt, pTcon,
nd->path.mnt, tlink,
nd->intent.open.flags,
oplock);
if (cfile == NULL) {

31
fs/cifs/file.c
View File

@ -283,7 +283,7 @@ int cifs_open(struct inode *inode, struct file *file)
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 @@ int cifs_open(struct inode *inode, struct file *file)
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 @@ static int cifs_reopen_file(struct file *file, bool can_flush)
}
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 @@ int cifs_close(struct inode *inode, struct file *file)
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 @@ int cifs_closedir(struct inode *inode, struct file *file)
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 @@ int cifs_closedir(struct inode *inode, struct file *file)
else
cifs_buf_release(ptmp);
}
cifs_put_tlink(pCFileStruct->tlink);
kfree(file->private_data);
file->private_data = NULL;
}
@ -770,7 +771,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
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 @@ ssize_t cifs_user_write(struct file *file, const char __user *write_data,
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 @@ static ssize_t cifs_write(struct file *file, const char *write_data,
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 @@ static int cifs_writepages(struct address_space *mapping,
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 @@ int cifs_fsync(struct file *file, int datasync)
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 @@ ssize_t cifs_user_read(struct file *file, char __user *read_data,
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 @@ static ssize_t cifs_read(struct file *file, char *read_data, size_t read_size,
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 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
}
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 @@ void cifs_oplock_break(struct work_struct *work)
* 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);
}

12
fs/cifs/inode.c
View File

@ -289,7 +289,7 @@ int cifs_get_file_info_unix(struct file *filp)
struct inode *inode = filp->f_path.dentry->d_inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsFileInfo *cfile = filp->private_data;
struct cifsTconInfo *tcon = cfile->tcon;
struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
xid = GetXid();
rc = CIFSSMBUnixQFileInfo(xid, tcon, cfile->netfid, &find_data);
@ -546,7 +546,7 @@ int cifs_get_file_info(struct file *filp)
struct inode *inode = filp->f_path.dentry->d_inode;
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsFileInfo *cfile = filp->private_data;
struct cifsTconInfo *tcon = cfile->tcon;
struct cifsTconInfo *tcon = tlink_tcon(cfile->tlink);
xid = GetXid();
rc = CIFSSMBQFileInfo(xid, tcon, cfile->netfid, &find_data);
@ -967,7 +967,7 @@ cifs_set_file_info(struct inode *inode, struct iattr *attrs, int xid,
if (open_file) {
netfid = open_file->netfid;
netpid = open_file->pid;
pTcon = open_file->tcon;
pTcon = tlink_tcon(open_file->tlink);
goto set_via_filehandle;
}
@ -1696,7 +1696,7 @@ int cifs_revalidate_file(struct file *filp)
if (!cifs_inode_needs_reval(inode))
goto check_inval;
if (cfile->tcon->unix_ext)
if (tlink_tcon(cfile->tlink)->unix_ext)
rc = cifs_get_file_info_unix(filp);
else
rc = cifs_get_file_info(filp);
@ -1817,7 +1817,7 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
if (open_file) {
__u16 nfid = open_file->netfid;
__u32 npid = open_file->pid;
pTcon = open_file->tcon;
pTcon = tlink_tcon(open_file->tlink);
rc = CIFSSMBSetFileSize(xid, pTcon, attrs->ia_size, nfid,
npid, false);
cifsFileInfo_put(open_file);
@ -1982,7 +1982,7 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
if (open_file) {
u16 nfid = open_file->netfid;
u32 npid = open_file->pid;
pTcon = open_file->tcon;
pTcon = tlink_tcon(open_file->tlink);
rc = CIFSSMBUnixSetFileInfo(xid, pTcon, args, nfid, npid);
cifsFileInfo_put(open_file);
} else {

2
fs/cifs/ioctl.c
View File

@ -38,7 +38,7 @@ long cifs_ioctl(struct file *filep, unsigned int command, unsigned long arg)
struct cifs_sb_info *cifs_sb;
#ifdef CONFIG_CIFS_POSIX
struct cifsFileInfo *pSMBFile = filep->private_data;
struct cifsTconInfo *tcon = pSMBFile->tcon;
struct cifsTconInfo *tcon = tlink_tcon(pSMBFile->tlink);
__u64 ExtAttrBits = 0;
__u64 ExtAttrMask = 0;
__u64 caps = le64_to_cpu(tcon->fsUnixInfo.Capability);

1
fs/cifs/link.c
View File

@ -346,7 +346,6 @@ cifs_hardlink(struct dentry *old_file, struct inode *inode,
goto cifs_hl_exit;
}
/* if (cifs_sb_target->tcon->ses->capabilities & CAP_UNIX)*/
if (pTcon->unix_ext)
rc = CIFSUnixCreateHardLink(xid, pTcon, fromName, toName,
cifs_sb->local_nls,

4
fs/cifs/readdir.c
View File

@ -245,7 +245,7 @@ static int initiate_cifs_search(const int xid, struct file *file)
cifsFile = file->private_data;
cifsFile->invalidHandle = true;
cifsFile->srch_inf.endOfSearch = false;
cifsFile->tcon = pTcon;
cifsFile->tlink = cifs_get_tlink(tlink);
full_path = build_path_from_dentry(file->f_path.dentry);
if (full_path == NULL) {
@ -838,7 +838,7 @@ int cifs_readdir(struct file *file, void *direntry, filldir_t filldir)
CIFSFindClose(xid, pTcon, cifsFile->netfid);
} */
pTcon = cifsFile->tcon;
pTcon = tlink_tcon(cifsFile->tlink);
rc = find_cifs_entry(xid, pTcon, file,
&current_entry, &num_to_fill);
if (rc) {