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CIFS: Respect epoch value from create lease context v2

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that force a client to purge cache pages when a server requests it.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Pavel Shilovsky 2013-09-05 21:30:16 +04:00 committed by Steve French
parent f047390a09
commit 42873b0a28
6 changed files with 71 additions and 17 deletions
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1
fs/cifs/cifsfs.c
View File

@ -255,6 +255,7 @@ cifs_alloc_inode(struct super_block *sb)
cifs_inode->server_eof = 0;
cifs_inode->uniqueid = 0;
cifs_inode->createtime = 0;
cifs_inode->epoch = 0;
#ifdef CONFIG_CIFS_SMB2
get_random_bytes(cifs_inode->lease_key, SMB2_LEASE_KEY_SIZE);
#endif

13
fs/cifs/cifsglob.h
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@ -373,11 +373,12 @@ struct smb_version_operations {
/* if we can do cache read operations */
bool (*is_read_op)(__u32);
/* set oplock level for the inode */
void (*set_oplock_level)(struct cifsInodeInfo *, __u32);
void (*set_oplock_level)(struct cifsInodeInfo *, __u32, unsigned int,
bool *);
/* create lease context buffer for CREATE request */
char * (*create_lease_buf)(u8 *, u8);
/* parse lease context buffer and return oplock info */
__u8 (*parse_lease_buf)(void *);
/* parse lease context buffer and return oplock/epoch info */
__u8 (*parse_lease_buf)(void *, unsigned int *);
};
struct smb_version_values {
@ -940,6 +941,8 @@ struct cifs_fid {
__u8 lease_key[SMB2_LEASE_KEY_SIZE]; /* lease key for smb2 */
#endif
struct cifs_pending_open *pending_open;
unsigned int epoch;
bool purge_cache;
};
struct cifs_fid_locks {
@ -1039,7 +1042,10 @@ void cifsFileInfo_put(struct cifsFileInfo *cifs_file);
#define CIFS_CACHE_READ_FLG 1
#define CIFS_CACHE_HANDLE_FLG 2
#define CIFS_CACHE_RH_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_WRITE_FLG 4
#define CIFS_CACHE_RW_FLG (CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG)
#define CIFS_CACHE_RHW_FLG (CIFS_CACHE_RW_FLG | CIFS_CACHE_HANDLE_FLG)
#define CIFS_CACHE_READ(cinode) (cinode->oplock & CIFS_CACHE_READ_FLG)
#define CIFS_CACHE_HANDLE(cinode) (cinode->oplock & CIFS_CACHE_HANDLE_FLG)
@ -1057,6 +1063,7 @@ struct cifsInodeInfo {
struct list_head openFileList;
__u32 cifsAttrs; /* e.g. DOS archive bit, sparse, compressed, system */
unsigned int oplock; /* oplock/lease level we have */
unsigned int epoch; /* used to track lease state changes */
bool delete_pending; /* DELETE_ON_CLOSE is set */
bool invalid_mapping; /* pagecache is invalid */
unsigned long time; /* jiffies of last update of inode */

4
fs/cifs/file.c
View File

@ -323,6 +323,7 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
oplock = fid->pending_open->oplock;
list_del(&fid->pending_open->olist);
fid->purge_cache = false;
server->ops->set_fid(cfile, fid, oplock);
list_add(&cfile->tlist, &tcon->openFileList);
@ -333,6 +334,9 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
list_add_tail(&cfile->flist, &cinode->openFileList);
spin_unlock(&cifs_file_list_lock);
if (fid->purge_cache)
cifs_invalidate_mapping(inode);
file->private_data = cfile;
return cfile;
}

6
fs/cifs/smb2misc.c
View File

@ -420,6 +420,7 @@ smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
__u8 lease_state;
struct list_head *tmp;
struct cifsFileInfo *cfile;
struct TCP_Server_Info *server = tcon->ses->server;
struct cifs_pending_open *open;
struct cifsInodeInfo *cinode;
int ack_req = le32_to_cpu(rsp->Flags &
@ -439,7 +440,7 @@ smb2_tcon_has_lease(struct cifs_tcon *tcon, struct smb2_lease_break *rsp,
cifs_dbg(FYI, "lease key match, lease break 0x%d\n",
le32_to_cpu(rsp->NewLeaseState));
tcon->ses->server->ops->set_oplock_level(cinode, lease_state);
server->ops->set_oplock_level(cinode, lease_state, 0, NULL);
if (ack_req)
cfile->oplock_break_cancelled = false;
@ -575,7 +576,8 @@ smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
cfile->oplock_break_cancelled = false;
server->ops->set_oplock_level(cinode,
rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0);
rsp->OplockLevel ? SMB2_OPLOCK_LEVEL_II : 0,
0, NULL);
queue_work(cifsiod_wq, &cfile->oplock_break);

57
fs/cifs/smb2ops.c
View File

@ -381,7 +381,8 @@ smb2_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)
cfile->fid.persistent_fid = fid->persistent_fid;
cfile->fid.volatile_fid = fid->volatile_fid;
server->ops->set_oplock_level(cinode, oplock);
server->ops->set_oplock_level(cinode, oplock, fid->epoch,
&fid->purge_cache);
cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);
}
@ -651,18 +652,18 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon,
}
static void
smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
unsigned int epoch, bool *purge_cache)
{
oplock &= 0xFF;
if (oplock == SMB2_OPLOCK_LEVEL_NOCHANGE)
return;
if (oplock == SMB2_OPLOCK_LEVEL_BATCH) {
cinode->oplock = CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG |
CIFS_CACHE_HANDLE_FLG;
cinode->oplock = CIFS_CACHE_RHW_FLG;
cifs_dbg(FYI, "Batch Oplock granted on inode %p\n",
&cinode->vfs_inode);
} else if (oplock == SMB2_OPLOCK_LEVEL_EXCLUSIVE) {
cinode->oplock = CIFS_CACHE_READ_FLG | CIFS_CACHE_WRITE_FLG;
cinode->oplock = CIFS_CACHE_RW_FLG;
cifs_dbg(FYI, "Exclusive Oplock granted on inode %p\n",
&cinode->vfs_inode);
} else if (oplock == SMB2_OPLOCK_LEVEL_II) {
@ -674,7 +675,8 @@ smb2_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
}
static void
smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
unsigned int epoch, bool *purge_cache)
{
char message[5] = {0};
@ -701,6 +703,41 @@ smb21_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock)
&cinode->vfs_inode);
}
static void
smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
unsigned int epoch, bool *purge_cache)
{
unsigned int old_oplock = cinode->oplock;
smb21_set_oplock_level(cinode, oplock, epoch, purge_cache);
if (purge_cache) {
*purge_cache = false;
if (old_oplock == CIFS_CACHE_READ_FLG) {
if (cinode->oplock == CIFS_CACHE_READ_FLG &&
(epoch - cinode->epoch > 0))
*purge_cache = true;
else if (cinode->oplock == CIFS_CACHE_RH_FLG &&
(epoch - cinode->epoch > 1))
*purge_cache = true;
else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
(epoch - cinode->epoch > 1))
*purge_cache = true;
else if (cinode->oplock == 0 &&
(epoch - cinode->epoch > 0))
*purge_cache = true;
} else if (old_oplock == CIFS_CACHE_RH_FLG) {
if (cinode->oplock == CIFS_CACHE_RH_FLG &&
(epoch - cinode->epoch > 0))
*purge_cache = true;
else if (cinode->oplock == CIFS_CACHE_RHW_FLG &&
(epoch - cinode->epoch > 1))
*purge_cache = true;
}
cinode->epoch = epoch;
}
}
static bool
smb2_is_read_op(__u32 oplock)
{
@ -780,20 +817,22 @@ smb3_create_lease_buf(u8 *lease_key, u8 oplock)
}
static __u8
smb2_parse_lease_buf(void *buf)
smb2_parse_lease_buf(void *buf, unsigned int *epoch)
{
struct create_lease *lc = (struct create_lease *)buf;
*epoch = 0; /* not used */
if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
return SMB2_OPLOCK_LEVEL_NOCHANGE;
return le32_to_cpu(lc->lcontext.LeaseState);
}
static __u8
smb3_parse_lease_buf(void *buf)
smb3_parse_lease_buf(void *buf, unsigned int *epoch)
{
struct create_lease_v2 *lc = (struct create_lease_v2 *)buf;
*epoch = le16_to_cpu(lc->lcontext.Epoch);
if (lc->lcontext.LeaseFlags & SMB2_LEASE_FLAG_BREAK_IN_PROGRESS)
return SMB2_OPLOCK_LEVEL_NOCHANGE;
return le32_to_cpu(lc->lcontext.LeaseState);
@ -1009,7 +1048,7 @@ struct smb_version_operations smb30_operations = {
.generate_signingkey = generate_smb3signingkey,
.calc_signature = smb3_calc_signature,
.is_read_op = smb21_is_read_op,
.set_oplock_level = smb21_set_oplock_level,
.set_oplock_level = smb3_set_oplock_level,
.create_lease_buf = smb3_create_lease_buf,
.parse_lease_buf = smb3_parse_lease_buf,
};

7
fs/cifs/smb2pdu.c
View File

@ -903,7 +903,8 @@ create_reconnect_durable_buf(struct cifs_fid *fid)
}
static __u8
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp)
parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp,
unsigned int *epoch)
{
char *data_offset;
struct create_context *cc;
@ -920,7 +921,7 @@ parse_lease_state(struct TCP_Server_Info *server, struct smb2_create_rsp *rsp)
next = le32_to_cpu(cc->Next);
continue;
}
return server->ops->parse_lease_buf(cc);
return server->ops->parse_lease_buf(cc, epoch);
} while (next != 0);
return 0;
@ -1102,7 +1103,7 @@ SMB2_open(const unsigned int xid, struct cifs_open_parms *oparms, __le16 *path,
}
if (rsp->OplockLevel == SMB2_OPLOCK_LEVEL_LEASE)
*oplock = parse_lease_state(server, rsp);
*oplock = parse_lease_state(server, rsp, &oparms->fid->epoch);
else
*oplock = rsp->OplockLevel;
creat_exit: