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CIFS: Add brlock support for SMB2

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Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru>
This commit is contained in:
Pavel Shilovsky 2012-09-19 06:22:43 -07:00 • committed by Steve French
parent 027e8eec31
commit f7ba7fe685
7 changed files with 210 additions and 5 deletions

4
fs/cifs/cifsproto.h
View file

@ -190,6 +190,10 @@ extern void cifs_dfs_release_automount_timer(void);
void cifs_proc_init(void);
void cifs_proc_clean(void);
extern void cifs_move_llist(struct list_head *source, struct list_head *dest);
extern void cifs_free_llist(struct list_head *llist);
extern void cifs_del_lock_waiters(struct cifsLockInfo *lock);
extern int cifs_negotiate_protocol(const unsigned int xid,
struct cifs_ses *ses);
extern int cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,

8
fs/cifs/file.c
View file

@ -288,8 +288,6 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
return cfile;
}
static void cifs_del_lock_waiters(struct cifsLockInfo *lock);
struct cifsFileInfo *
cifsFileInfo_get(struct cifsFileInfo *cifs_file)
{
@ -696,7 +694,7 @@ cifs_lock_init(__u64 offset, __u64 length, __u8 type)
return lock;
}
static void
void
cifs_del_lock_waiters(struct cifsLockInfo *lock)
{
struct cifsLockInfo *li, *tmp;
@ -1229,7 +1227,7 @@ cifs_getlk(struct file *file, struct file_lock *flock, __u32 type,
return 0;
}
static void
void
cifs_move_llist(struct list_head *source, struct list_head *dest)
{
struct list_head *li, *tmp;
@ -1237,7 +1235,7 @@ cifs_move_llist(struct list_head *source, struct list_head *dest)
list_move(li, dest);
}
static void
void
cifs_free_llist(struct list_head *llist)
{
struct cifsLockInfo *li, *tmp;

97
fs/cifs/smb2file.c
View file

@ -104,3 +104,100 @@ smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon, const char *path,
kfree(smb2_path);
return rc;
}
int
smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
const unsigned int xid)
{
int rc = 0, stored_rc;
unsigned int max_num, num = 0, max_buf;
struct smb2_lock_element *buf, *cur;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
struct cifsLockInfo *li, *tmp;
__u64 length = 1 + flock->fl_end - flock->fl_start;
struct list_head tmp_llist;
INIT_LIST_HEAD(&tmp_llist);
/*
* Accessing maxBuf is racy with cifs_reconnect - need to store value
* and check it for zero before using.
*/
max_buf = tcon->ses->server->maxBuf;
if (!max_buf)
return -EINVAL;
max_num = max_buf / sizeof(struct smb2_lock_element);
buf = kzalloc(max_num * sizeof(struct smb2_lock_element), GFP_KERNEL);
if (!buf)
return -ENOMEM;
cur = buf;
mutex_lock(&cinode->lock_mutex);
list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
if (flock->fl_start > li->offset ||
(flock->fl_start + length) <
(li->offset + li->length))
continue;
if (current->tgid != li->pid)
continue;
if (cinode->can_cache_brlcks) {
/*
* We can cache brlock requests - simply remove a lock
* from the file's list.
*/
list_del(&li->llist);
cifs_del_lock_waiters(li);
kfree(li);
continue;
}
cur->Length = cpu_to_le64(li->length);
cur->Offset = cpu_to_le64(li->offset);
cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
/*
* We need to save a lock here to let us add it again to the
* file's list if the unlock range request fails on the server.
*/
list_move(&li->llist, &tmp_llist);
if (++num == max_num) {
stored_rc = smb2_lockv(xid, tcon,
cfile->fid.persistent_fid,
cfile->fid.volatile_fid,
current->tgid, num, buf);
if (stored_rc) {
/*
* We failed on the unlock range request - add
* all locks from the tmp list to the head of
* the file's list.
*/
cifs_move_llist(&tmp_llist,
&cfile->llist->locks);
rc = stored_rc;
} else
/*
* The unlock range request succeed - free the
* tmp list.
*/
cifs_free_llist(&tmp_llist);
cur = buf;
num = 0;
} else
cur++;
}
if (num) {
stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
cfile->fid.volatile_fid, current->tgid,
num, buf);
if (stored_rc) {
cifs_move_llist(&tmp_llist, &cfile->llist->locks);
rc = stored_rc;
} else
cifs_free_llist(&tmp_llist);
}
mutex_unlock(&cinode->lock_mutex);
kfree(buf);
return rc;
}

13
fs/cifs/smb2ops.c
View file

@ -544,6 +544,17 @@ smb2_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)
ob1->fid.volatile_fid == ob2->fid.volatile_fid;
}
static int
smb2_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,
__u64 length, __u32 type, int lock, int unlock, bool wait)
{
if (unlock && !lock)
type = SMB2_LOCKFLAG_UNLOCK;
return SMB2_lock(xid, tlink_tcon(cfile->tlink),
cfile->fid.persistent_fid, cfile->fid.volatile_fid,
current->tgid, length, offset, type, wait);
}
struct smb_version_operations smb21_operations = {
.compare_fids = smb2_compare_fids,
.setup_request = smb2_setup_request,
@ -602,6 +613,8 @@ struct smb_version_operations smb21_operations = {
.is_status_pending = smb2_is_status_pending,
.oplock_response = smb2_oplock_response,
.queryfs = smb2_queryfs,
.mand_lock = smb2_mand_lock,
.mand_unlock_range = smb2_unlock_range,
};
struct smb_version_values smb21_values = {

59
fs/cifs/smb2pdu.c
View file

@ -2047,3 +2047,62 @@ SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
free_rsp_buf(resp_buftype, iov.iov_base);
return rc;
}
int
smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
const __u32 num_lock, struct smb2_lock_element *buf)
{
int rc = 0;
struct smb2_lock_req *req = NULL;
struct kvec iov[2];
int resp_buf_type;
unsigned int count;
cFYI(1, "smb2_lockv num lock %d", num_lock);
rc = small_smb2_init(SMB2_LOCK, tcon, (void **) &req);
if (rc)
return rc;
req->hdr.ProcessId = cpu_to_le32(pid);
req->LockCount = cpu_to_le16(num_lock);
req->PersistentFileId = persist_fid;
req->VolatileFileId = volatile_fid;
count = num_lock * sizeof(struct smb2_lock_element);
inc_rfc1001_len(req, count - sizeof(struct smb2_lock_element));
iov[0].iov_base = (char *)req;
/* 4 for rfc1002 length field and count for all locks */
iov[0].iov_len = get_rfc1002_length(req) + 4 - count;
iov[1].iov_base = (char *)buf;
iov[1].iov_len = count;
cifs_stats_inc(&tcon->stats.cifs_stats.num_locks);
rc = SendReceive2(xid, tcon->ses, iov, 2, &resp_buf_type, CIFS_NO_RESP);
if (rc) {
cFYI(1, "Send error in smb2_lockv = %d", rc);
cifs_stats_fail_inc(tcon, SMB2_LOCK_HE);
}
return rc;
}
int
SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
const __u64 persist_fid, const __u64 volatile_fid, const __u32 pid,
const __u64 length, const __u64 offset, const __u32 lock_flags,
const bool wait)
{
struct smb2_lock_element lock;
lock.Offset = cpu_to_le64(offset);
lock.Length = cpu_to_le64(length);
lock.Flags = cpu_to_le32(lock_flags);
if (!wait && lock_flags != SMB2_LOCKFLAG_UNLOCK)
lock.Flags |= cpu_to_le32(SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
return smb2_lockv(xid, tcon, persist_fid, volatile_fid, pid, 1, &lock);
}

24
fs/cifs/smb2pdu.h
View file

@ -531,6 +531,30 @@ struct smb2_write_rsp {
#define SMB2_LOCKFLAG_UNLOCK 0x0004
#define SMB2_LOCKFLAG_FAIL_IMMEDIATELY 0x0010
struct smb2_lock_element {
__le64 Offset;
__le64 Length;
__le32 Flags;
__le32 Reserved;
} __packed;
struct smb2_lock_req {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 48 */
__le16 LockCount;
__le32 Reserved;
__u64 PersistentFileId; /* opaque endianness */
__u64 VolatileFileId; /* opaque endianness */
/* Followed by at least one */
struct smb2_lock_element locks[1];
} __packed;
struct smb2_lock_rsp {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 4 */
__le16 Reserved;
} __packed;
struct smb2_echo_req {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 4 */

10
fs/cifs/smb2proto.h
View file

@ -84,6 +84,8 @@ extern int smb2_open_file(const unsigned int xid, struct cifs_tcon *tcon,
struct cifs_fid *fid, __u32 *oplock,
FILE_ALL_INFO *buf, struct cifs_sb_info *cifs_sb);
extern void smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock);
extern int smb2_unlock_range(struct cifsFileInfo *cfile,
struct file_lock *flock, const unsigned int xid);
/*
* SMB2 Worker functions - most of protocol specific implementation details
@ -140,5 +142,13 @@ extern int SMB2_oplock_break(const unsigned int xid, struct cifs_tcon *tcon,
extern int SMB2_QFS_info(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_file_id, u64 volatile_file_id,
struct kstatfs *FSData);
extern int SMB2_lock(const unsigned int xid, struct cifs_tcon *tcon,
const __u64 persist_fid, const __u64 volatile_fid,
const __u32 pid, const __u64 length, const __u64 offset,
const __u32 lockFlags, const bool wait);
extern int smb2_lockv(const unsigned int xid, struct cifs_tcon *tcon,
const __u64 persist_fid, const __u64 volatile_fid,
const __u32 pid, const __u32 num_lock,
struct smb2_lock_element *buf);
#endif /* _SMB2PROTO_H */