| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1225379793-23283-5-git-send-email-jlayton@redhat.com>
Date: Thu, 30 Oct 2008 11:16:33 -0400
From: Jeff Layton <jlayton@...hat.com>
To: smfrench@...il.com
Cc: smfrench@...tin.rr.com, linux-cifs-client@...ts.samba.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] cifs: reinstate sharing of tree connections
Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
fs/cifs/cifs_debug.c | 244 ++++++++++++++++++++++++++++---------------------
fs/cifs/cifsfs.c | 8 +-
fs/cifs/cifsglob.h | 8 +-
fs/cifs/cifssmb.c | 34 +------
fs/cifs/connect.c | 95 ++++++++++++++------
fs/cifs/misc.c | 78 ++++++++--------
6 files changed, 258 insertions(+), 209 deletions(-)
diff --git a/fs/cifs/cifs_debug.c b/fs/cifs/cifs_debug.c
index 81ccc60..0472114 100644
--- a/fs/cifs/cifs_debug.c
+++ b/fs/cifs/cifs_debug.c
@@ -107,12 +107,13 @@ void cifs_dump_mids(struct TCP_Server_Info *server)
#ifdef CONFIG_PROC_FS
static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
{
- struct list_head *tmp, *tmp2, *tmp3;
+ struct list_head *tmp1, *tmp2, *tmp3;
struct mid_q_entry *mid_entry;
struct TCP_Server_Info *server;
struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
- int i;
+ int i, j;
+ __u32 dev_type;
seq_puts(m,
"Display Internal CIFS Data Structures for Debugging\n"
@@ -123,8 +124,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
i = 0;
spin_lock(&cifs_tcp_session_lock);
- list_for_each(tmp, &cifs_tcp_session_list) {
- server = list_entry(tmp, struct TCP_Server_Info,
+ list_for_each(tmp1, &cifs_tcp_session_list) {
+ server = list_entry(tmp1, struct TCP_Server_Info,
tcp_session_list);
i++;
spin_lock(&server->smb_session_lock);
@@ -134,12 +135,12 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
if ((ses->serverDomain == NULL) ||
(ses->serverOS == NULL) ||
(ses->serverNOS == NULL)) {
- seq_printf(m, "\nentry for %s not fully "
- "displayed\n\t", ses->serverName);
+ seq_printf(m, "\n%d) entry for %s not fully "
+ "displayed\n\t", i, ses->serverName);
} else {
seq_printf(m,
- "\n%d) Name: %s Domain: %s Mounts: %d OS:"
- " %s \n\tNOS: %s\tCapability: 0x%x\n\tSMB"
+ "\n%d) Name: %s Domain: %s Uses: %d OS:"
+ " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
" session status: %d\t",
i, ses->serverName, ses->serverDomain,
ses->refcount, ses->serverOS, ses->serverNOS,
@@ -156,14 +157,46 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
atomic_read(&server->num_waiters));
#endif
- seq_puts(m, "\nMIDs:\n");
+ seq_puts(m, "\n\tShares:");
+ j = 0;
+ spin_lock(&ses->tcon_lock);
+ list_for_each(tmp3, &ses->tcon_list) {
+ tcon = list_entry(tmp3, struct cifsTconInfo,
+ tcon_list);
+ ++j;
+ dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
+ seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
+ tcon->treeName, tcon->refcount);
+ if (tcon->nativeFileSystem) {
+ seq_printf(m, "Type: %s ",
+ tcon->nativeFileSystem);
+ }
+ seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
+ "\nPathComponentMax: %d Status: %d",
+ le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
+ le32_to_cpu(tcon->fsAttrInfo.Attributes),
+ le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
+ tcon->tidStatus);
+ if (dev_type == FILE_DEVICE_DISK)
+ seq_puts(m, " type: DISK ");
+ else if (dev_type == FILE_DEVICE_CD_ROM)
+ seq_puts(m, " type: CDROM ");
+ else
+ seq_printf(m, " type: %d ", dev_type);
+
+ if (tcon->tidStatus == CifsNeedReconnect)
+ seq_puts(m, "\tDISCONNECTED ");
+ seq_putc(m, '\n');
+ }
+ spin_unlock(&ses->tcon_lock);
+
+ seq_puts(m, "\n\tMIDs:\n");
spin_lock(&GlobalMid_Lock);
list_for_each(tmp3, &server->pending_mid_q) {
- mid_entry = list_entry(tmp3, struct
- mid_q_entry,
+ mid_entry = list_entry(tmp3, struct mid_q_entry,
qhead);
- seq_printf(m, "State: %d com: %d pid:"
+ seq_printf(m, "\tState: %d com: %d pid:"
" %d tsk: %p mid %d\n",
mid_entry->midState,
(int)mid_entry->command,
@@ -178,40 +211,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
spin_unlock(&cifs_tcp_session_lock);
seq_putc(m, '\n');
- seq_puts(m, "Shares:");
- i = 0;
- read_lock(&GlobalSMBSeslock);
- list_for_each(tmp, &GlobalTreeConnectionList) {
- __u32 dev_type;
- i++;
- tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
- dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
- seq_printf(m, "\n%d) %s Uses: %d ", i,
- tcon->treeName, atomic_read(&tcon->useCount));
- if (tcon->nativeFileSystem) {
- seq_printf(m, "Type: %s ",
- tcon->nativeFileSystem);
- }
- seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
- "\nPathComponentMax: %d Status: %d",
- le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
- le32_to_cpu(tcon->fsAttrInfo.Attributes),
- le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
- tcon->tidStatus);
- if (dev_type == FILE_DEVICE_DISK)
- seq_puts(m, " type: DISK ");
- else if (dev_type == FILE_DEVICE_CD_ROM)
- seq_puts(m, " type: CDROM ");
- else
- seq_printf(m, " type: %d ", dev_type);
-
- if (tcon->tidStatus == CifsNeedReconnect)
- seq_puts(m, "\tDISCONNECTED ");
- }
- read_unlock(&GlobalSMBSeslock);
- seq_putc(m, '\n');
/* BB add code to dump additional info such as TCP session info now */
return 0;
@@ -236,7 +237,9 @@ static ssize_t cifs_stats_proc_write(struct file *file,
{
char c;
int rc;
- struct list_head *tmp;
+ struct list_head *tmp1, *tmp2, *tmp3;
+ struct TCP_Server_Info *server;
+ struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
rc = get_user(c, buffer);
@@ -244,33 +247,46 @@ static ssize_t cifs_stats_proc_write(struct file *file,
return rc;
if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
- read_lock(&GlobalSMBSeslock);
#ifdef CONFIG_CIFS_STATS2
atomic_set(&totBufAllocCount, 0);
atomic_set(&totSmBufAllocCount, 0);
#endif /* CONFIG_CIFS_STATS2 */
- list_for_each(tmp, &GlobalTreeConnectionList) {
- tcon = list_entry(tmp, struct cifsTconInfo,
- cifsConnectionList);
- atomic_set(&tcon->num_smbs_sent, 0);
- atomic_set(&tcon->num_writes, 0);
- atomic_set(&tcon->num_reads, 0);
- atomic_set(&tcon->num_oplock_brks, 0);
- atomic_set(&tcon->num_opens, 0);
- atomic_set(&tcon->num_closes, 0);
- atomic_set(&tcon->num_deletes, 0);
- atomic_set(&tcon->num_mkdirs, 0);
- atomic_set(&tcon->num_rmdirs, 0);
- atomic_set(&tcon->num_renames, 0);
- atomic_set(&tcon->num_t2renames, 0);
- atomic_set(&tcon->num_ffirst, 0);
- atomic_set(&tcon->num_fnext, 0);
- atomic_set(&tcon->num_fclose, 0);
- atomic_set(&tcon->num_hardlinks, 0);
- atomic_set(&tcon->num_symlinks, 0);
- atomic_set(&tcon->num_locks, 0);
+ spin_lock(&cifs_tcp_session_lock);
+ list_for_each(tmp1, &cifs_tcp_session_list) {
+ server = list_entry(tmp1, struct TCP_Server_Info,
+ tcp_session_list);
+ spin_lock(server->smb_session_lock);
+ list_for_each(tmp2, &server->smb_session_list) {
+ ses = list_entry(tmp2, struct cifsSesInfo,
+ smb_session_list);
+ spin_lock(&ses->tcon_lock);
+ list_for_each(tmp3, &ses->tcon_list) {
+ tcon = list_entry(tmp3,
+ struct cifsTconInfo,
+ tcon_list);
+ atomic_set(&tcon->num_smbs_sent, 0);
+ atomic_set(&tcon->num_writes, 0);
+ atomic_set(&tcon->num_reads, 0);
+ atomic_set(&tcon->num_oplock_brks, 0);
+ atomic_set(&tcon->num_opens, 0);
+ atomic_set(&tcon->num_closes, 0);
+ atomic_set(&tcon->num_deletes, 0);
+ atomic_set(&tcon->num_mkdirs, 0);
+ atomic_set(&tcon->num_rmdirs, 0);
+ atomic_set(&tcon->num_renames, 0);
+ atomic_set(&tcon->num_t2renames, 0);
+ atomic_set(&tcon->num_ffirst, 0);
+ atomic_set(&tcon->num_fnext, 0);
+ atomic_set(&tcon->num_fclose, 0);
+ atomic_set(&tcon->num_hardlinks, 0);
+ atomic_set(&tcon->num_symlinks, 0);
+ atomic_set(&tcon->num_locks, 0);
+ }
+ spin_unlock(&ses->tcon_lock);
+ }
+ spin_unlock(&server->smb_session_lock);
}
- read_unlock(&GlobalSMBSeslock);
+ spin_unlock(&cifs_tcp_session_lock);
}
return count;
@@ -279,7 +295,9 @@ static ssize_t cifs_stats_proc_write(struct file *file,
static int cifs_stats_proc_show(struct seq_file *m, void *v)
{
int i;
- struct list_head *tmp;
+ struct list_head *tmp1, *tmp2, *tmp3;
+ struct TCP_Server_Info *server;
+ struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
seq_printf(m,
@@ -308,44 +326,60 @@ static int cifs_stats_proc_show(struct seq_file *m, void *v)
GlobalCurrentXid, GlobalMaxActiveXid);
i = 0;
- read_lock(&GlobalSMBSeslock);
- list_for_each(tmp, &GlobalTreeConnectionList) {
- i++;
- tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
- seq_printf(m, "\n%d) %s", i, tcon->treeName);
- if (tcon->tidStatus == CifsNeedReconnect)
- seq_puts(m, "\tDISCONNECTED ");
- seq_printf(m, "\nSMBs: %d Oplock Breaks: %d",
- atomic_read(&tcon->num_smbs_sent),
- atomic_read(&tcon->num_oplock_brks));
- seq_printf(m, "\nReads: %d Bytes: %lld",
- atomic_read(&tcon->num_reads),
- (long long)(tcon->bytes_read));
- seq_printf(m, "\nWrites: %d Bytes: %lld",
- atomic_read(&tcon->num_writes),
- (long long)(tcon->bytes_written));
- seq_printf(m,
- "\nLocks: %d HardLinks: %d Symlinks: %d",
- atomic_read(&tcon->num_locks),
- atomic_read(&tcon->num_hardlinks),
- atomic_read(&tcon->num_symlinks));
-
- seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",
- atomic_read(&tcon->num_opens),
- atomic_read(&tcon->num_closes),
- atomic_read(&tcon->num_deletes));
- seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
- atomic_read(&tcon->num_mkdirs),
- atomic_read(&tcon->num_rmdirs));
- seq_printf(m, "\nRenames: %d T2 Renames %d",
- atomic_read(&tcon->num_renames),
- atomic_read(&tcon->num_t2renames));
- seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",
- atomic_read(&tcon->num_ffirst),
- atomic_read(&tcon->num_fnext),
- atomic_read(&tcon->num_fclose));
+ spin_lock(&cifs_tcp_session_lock);
+ list_for_each(tmp1, &cifs_tcp_session_list) {
+ server = list_entry(tmp1, struct TCP_Server_Info,
+ tcp_session_list);
+ spin_lock(server->smb_session_lock);
+ list_for_each(tmp2, &server->smb_session_list) {
+ ses = list_entry(tmp2, struct cifsSesInfo,
+ smb_session_list);
+ spin_lock(&ses->tcon_lock);
+ list_for_each(tmp3, &ses->tcon_list) {
+ tcon = list_entry(tmp3,
+ struct cifsTconInfo,
+ tcon_list);
+ i++;
+ seq_printf(m, "\n%d) %s", i, tcon->treeName);
+ if (tcon->tidStatus == CifsNeedReconnect)
+ seq_puts(m, "\tDISCONNECTED ");
+ seq_printf(m, "\nSMBs: %d Oplock Breaks: %d",
+ atomic_read(&tcon->num_smbs_sent),
+ atomic_read(&tcon->num_oplock_brks));
+ seq_printf(m, "\nReads: %d Bytes: %lld",
+ atomic_read(&tcon->num_reads),
+ (long long)(tcon->bytes_read));
+ seq_printf(m, "\nWrites: %d Bytes: %lld",
+ atomic_read(&tcon->num_writes),
+ (long long)(tcon->bytes_written));
+ seq_printf(m, "\nLocks: %d HardLinks: %d "
+ "Symlinks: %d",
+ atomic_read(&tcon->num_locks),
+ atomic_read(&tcon->num_hardlinks),
+ atomic_read(&tcon->num_symlinks));
+
+ seq_printf(m, "\nOpens: %d Closes: %d"
+ "Deletes: %d",
+ atomic_read(&tcon->num_opens),
+ atomic_read(&tcon->num_closes),
+ atomic_read(&tcon->num_deletes));
+ seq_printf(m, "\nMkdirs: %d Rmdirs: %d",
+ atomic_read(&tcon->num_mkdirs),
+ atomic_read(&tcon->num_rmdirs));
+ seq_printf(m, "\nRenames: %d T2 Renames %d",
+ atomic_read(&tcon->num_renames),
+ atomic_read(&tcon->num_t2renames));
+ seq_printf(m, "\nFindFirst: %d FNext %d "
+ "FClose %d",
+ atomic_read(&tcon->num_ffirst),
+ atomic_read(&tcon->num_fnext),
+ atomic_read(&tcon->num_fclose));
+ }
+ spin_unlock(&ses->tcon_lock);
+ }
+ spin_unlock(&server->smb_session_lock);
}
- read_unlock(&GlobalSMBSeslock);
+ spin_unlock(&cifs_tcp_session_lock);
seq_putc(m, '\n');
return 0;
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index a6072b3..ee04ad4 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -520,10 +520,11 @@ static void cifs_umount_begin(struct super_block *sb)
tcon = cifs_sb->tcon;
if (tcon == NULL)
return;
- down(&tcon->tconSem);
- if (atomic_read(&tcon->useCount) == 1)
+ spin_lock(&tcon->ses->tcon_lock);
+ if (tcon->refcount == 1) {
tcon->tidStatus = CifsExiting;
- up(&tcon->tconSem);
+ }
+ spin_unlock(&tcon->ses->tcon_lock);
/* cancel_brl_requests(tcon); */ /* BB mark all brl mids as exiting */
/* cancel_notify_requests(tcon); */
@@ -1066,7 +1067,6 @@ init_cifs(void)
int rc = 0;
cifs_proc_init();
/* INIT_LIST_HEAD(&GlobalServerList);*/ /* BB not implemented yet */
- INIT_LIST_HEAD(&GlobalTreeConnectionList);
INIT_LIST_HEAD(&GlobalOplock_Q);
INIT_LIST_HEAD(&cifs_tcp_session_list);
#ifdef CONFIG_CIFS_EXPERIMENTAL
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 59befef..e5aa4cf 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -190,6 +190,8 @@ struct cifsUidInfo {
*/
struct cifsSesInfo {
struct list_head smb_session_list;
+ struct list_head tcon_list;
+ spinlock_t tcon_lock;
struct semaphore sesSem;
#if 0
struct cifsUidInfo *uidInfo; /* pointer to user info */
@@ -225,16 +227,15 @@ struct cifsSesInfo {
* session
*/
struct cifsTconInfo {
- struct list_head cifsConnectionList;
+ struct list_head tcon_list;
+ int refcount;
struct list_head openFileList;
- struct semaphore tconSem;
struct cifsSesInfo *ses; /* pointer to session associated with */
char treeName[MAX_TREE_SIZE + 1]; /* UNC name of resource in ASCII */
char *nativeFileSystem;
__u16 tid; /* The 2 byte tree id */
__u16 Flags; /* optional support bits */
enum statusEnum tidStatus;
- atomic_t useCount; /* how many explicit/implicit mounts to share */
#ifdef CONFIG_CIFS_STATS
atomic_t num_smbs_sent;
atomic_t num_writes;
@@ -595,7 +596,6 @@ require use of the stronger protocol */
GLOBAL_EXTERN struct smbUidInfo *GlobalUidList[UID_HASH];
/* GLOBAL_EXTERN struct list_head GlobalServerList; BB not implemented yet */
-GLOBAL_EXTERN struct list_head GlobalTreeConnectionList;
GLOBAL_EXTERN rwlock_t GlobalSMBSeslock; /* protects list inserts on 3 above */
extern struct list_head cifs_tcp_session_list;
extern spinlock_t cifs_tcp_session_lock;
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index c9e9243..78131d8 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -740,50 +740,26 @@ CIFSSMBTDis(const int xid, struct cifsTconInfo *tcon)
int rc = 0;
cFYI(1, ("In tree disconnect"));
- /*
- * If last user of the connection and
- * connection alive - disconnect it
- * If this is the last connection on the server session disconnect it
- * (and inside session disconnect we should check if tcp socket needs
- * to be freed and kernel thread woken up).
- */
- if (tcon)
- down(&tcon->tconSem);
- else
- return -EIO;
-
- atomic_dec(&tcon->useCount);
- if (atomic_read(&tcon->useCount) > 0) {
- up(&tcon->tconSem);
- return -EBUSY;
- }
/* No need to return error on this operation if tid invalidated and
closed on server already e.g. due to tcp session crashing */
- if (tcon->tidStatus == CifsNeedReconnect) {
- up(&tcon->tconSem);
+ if (tcon->tidStatus == CifsNeedReconnect)
return 0;
- }
- if ((tcon->ses == NULL) || (tcon->ses->server == NULL)) {
- up(&tcon->tconSem);
+ if ((tcon->ses == NULL) || (tcon->ses->server == NULL))
return -EIO;
- }
+
rc = small_smb_init(SMB_COM_TREE_DISCONNECT, 0, tcon,
(void **)&smb_buffer);
- if (rc) {
- up(&tcon->tconSem);
+ if (rc)
return rc;
- }
rc = SendReceiveNoRsp(xid, tcon->ses, smb_buffer, 0);
if (rc)
cFYI(1, ("Tree disconnect failed %d", rc));
- up(&tcon->tconSem);
-
/* No need to return error on this operation if tid invalidated and
- closed on server already e.g. due to tcp session crashing */
+ closed on server already e.g. due to tcp session crashing */
if (rc == -EAGAIN)
rc = 0;
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 1d7d7c8..608fc3b 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -124,7 +124,7 @@ static int
cifs_reconnect(struct TCP_Server_Info *server)
{
int rc = 0;
- struct list_head *tmp;
+ struct list_head *tmp, *tmp2;
struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
struct mid_q_entry *mid_entry;
@@ -149,13 +149,14 @@ cifs_reconnect(struct TCP_Server_Info *server)
ses = list_entry(tmp, struct cifsSesInfo, smb_session_list);
ses->status = CifsNeedReconnect;
ses->ipc_tid = 0;
- }
- spin_unlock(&server->smb_session_lock);
- list_for_each(tmp, &GlobalTreeConnectionList) {
- tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
- if ((tcon->ses) && (tcon->ses->server == server))
+ spin_lock(&ses->tcon_lock);
+ list_for_each(tmp2, &ses->tcon_list) {
+ tcon = list_entry(tmp2, struct cifsTconInfo, tcon_list);
tcon->tidStatus = CifsNeedReconnect;
+ }
+ spin_unlock(&ses->tcon_lock);
}
+ spin_unlock(&server->smb_session_lock);
/* do not want to be sending data on a socket we are freeing */
down(&server->tcpSem);
if (server->ssocket) {
@@ -1447,6 +1448,50 @@ cifs_put_smb_session(struct cifsSesInfo *ses)
cifs_put_tcp_session(server);
}
+static struct cifsTconInfo *
+cifs_find_tcon(struct cifsSesInfo *ses, const char *unc)
+{
+ struct list_head *tmp;
+ struct cifsTconInfo *tcon;
+
+ spin_lock(&ses->tcon_lock);
+ list_for_each(tmp, &ses->tcon_list) {
+ tcon = list_entry(tmp, struct cifsTconInfo, tcon_list);
+ if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE))
+ continue;
+
+ ++tcon->refcount;
+ spin_unlock(&ses->tcon_lock);
+ return tcon;
+ }
+ spin_unlock(&ses->tcon_lock);
+ return NULL;
+}
+
+static void
+cifs_put_tcon(struct cifsTconInfo *tcon)
+{
+ int xid;
+ struct cifsSesInfo *ses = tcon->ses;
+
+ spin_lock(&ses->tcon_lock);
+ if (--tcon->refcount > 0) {
+ spin_unlock(&ses->tcon_lock);
+ return;
+ }
+
+ list_del_init(&tcon->tcon_list);
+ spin_unlock(&ses->tcon_lock);
+
+ xid = GetXid();
+ CIFSSMBTDis(xid, tcon);
+ _FreeXid(xid);
+
+ DeleteTconOplockQEntries(tcon);
+ tconInfoFree(tcon);
+ cifs_put_smb_session(ses);
+}
+
int
get_dfs_path(int xid, struct cifsSesInfo *pSesInfo, const char *old_path,
const struct nls_table *nls_codepage, unsigned int *pnum_referrals,
@@ -2201,8 +2246,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
cERROR(1, ("mount option dynperm ignored if cifsacl "
"mount option supported"));
+ tcon = cifs_find_tcon(pSesInfo, volume_info.UNC);
if (tcon) {
cFYI(1, ("Found match on UNC path"));
+ /* existing tcon already has a reference */
+ cifs_put_smb_session(pSesInfo);
+
/* we can have only one retry value for a connection
to a share so for resources mounted more than once
to the same server share the last value passed in
@@ -2252,6 +2301,12 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
tcon->retry = volume_info.retry;
tcon->nocase = volume_info.nocase;
tcon->seal = volume_info.seal;
+ tcon->ses = pSesInfo;
+ ++tcon->refcount;
+ spin_lock(&pSesInfo->tcon_lock);
+ list_add(&tcon->tcon_list,
+ &pSesInfo->tcon_list);
+ spin_unlock(&pSesInfo->tcon_lock);
}
}
}
@@ -2271,17 +2326,13 @@ cifs_mount(struct super_block *sb, struct cifs_sb_info *cifs_sb,
/* If find_unc succeeded then rc == 0 so we can not end */
/* up accidently freeing someone elses tcon struct */
if (tcon)
- tconInfoFree(tcon);
-
- /* should also end up putting our tcp session ref if needed */
- if (pSesInfo)
+ cifs_put_tcon(tcon);
+ else if (pSesInfo)
cifs_put_smb_session(pSesInfo);
else
cifs_put_tcp_session(srvTcp);
} else {
- atomic_inc(&tcon->useCount);
cifs_sb->tcon = tcon;
- tcon->ses = pSesInfo;
/* do not care if following two calls succeed - informational */
if (!tcon->ipc) {
@@ -3484,7 +3535,9 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
/* if (rc) rc = map_smb_to_linux_error(smb_buffer_response); */
/* above now done in SendReceive */
if ((rc == 0) && (tcon != NULL)) {
+ spin_lock(&ses->tcon_lock);
tcon->tidStatus = CifsGood;
+ spin_unlock(&ses->tcon_lock);
tcon->tid = smb_buffer_response->Tid;
bcc_ptr = pByteArea(smb_buffer_response);
length = strnlen(bcc_ptr, BCC(smb_buffer_response) - 2);
@@ -3556,23 +3609,10 @@ int
cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
{
int rc = 0;
- int xid;
- struct cifsSesInfo *ses = NULL;
char *tmp;
- xid = GetXid();
-
- if (cifs_sb->tcon) {
- ses = cifs_sb->tcon->ses; /* save ptr to ses before delete tcon!*/
- rc = CIFSSMBTDis(xid, cifs_sb->tcon);
- if (rc == -EBUSY) {
- FreeXid(xid);
- return 0;
- }
- DeleteTconOplockQEntries(cifs_sb->tcon);
- tconInfoFree(cifs_sb->tcon);
- cifs_put_smb_session(ses);
- }
+ if (cifs_sb->tcon)
+ cifs_put_tcon(cifs_sb->tcon);
cifs_sb->tcon = NULL;
tmp = cifs_sb->prepath;
@@ -3580,7 +3620,6 @@ cifs_umount(struct super_block *sb, struct cifs_sb_info *cifs_sb)
cifs_sb->prepath = NULL;
kfree(tmp);
- FreeXid(xid);
return rc;
}
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 4a5c6bd..d5a95c1 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -78,6 +78,8 @@ sesInfoAlloc(void)
atomic_inc(&sesInfoAllocCount);
ret_buf->status = CifsNew;
INIT_LIST_HEAD(&ret_buf->smb_session_list);
+ INIT_LIST_HEAD(&ret_buf->tcon_list);
+ spin_lock_init(&ret_buf->tcon_lock);
init_MUTEX(&ret_buf->sesSem);
}
return ret_buf;
@@ -106,17 +108,13 @@ tconInfoAlloc(void)
struct cifsTconInfo *ret_buf;
ret_buf = kzalloc(sizeof(struct cifsTconInfo), GFP_KERNEL);
if (ret_buf) {
- write_lock(&GlobalSMBSeslock);
atomic_inc(&tconInfoAllocCount);
- list_add(&ret_buf->cifsConnectionList,
- &GlobalTreeConnectionList);
ret_buf->tidStatus = CifsNew;
INIT_LIST_HEAD(&ret_buf->openFileList);
- init_MUTEX(&ret_buf->tconSem);
+ INIT_LIST_HEAD(&ret_buf->tcon_list);
#ifdef CONFIG_CIFS_STATS
spin_lock_init(&ret_buf->stat_lock);
#endif
- write_unlock(&GlobalSMBSeslock);
}
return ret_buf;
}
@@ -128,10 +126,7 @@ tconInfoFree(struct cifsTconInfo *buf_to_free)
cFYI(1, ("Null buffer passed to tconInfoFree"));
return;
}
- write_lock(&GlobalSMBSeslock);
atomic_dec(&tconInfoAllocCount);
- list_del(&buf_to_free->cifsConnectionList);
- write_unlock(&GlobalSMBSeslock);
kfree(buf_to_free->nativeFileSystem);
kfree(buf_to_free);
}
@@ -492,9 +487,10 @@ bool
is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
{
struct smb_com_lock_req *pSMB = (struct smb_com_lock_req *)buf;
- struct list_head *tmp;
- struct list_head *tmp1;
+ struct list_head *tmp, *tmp1, *tmp2;
+ struct cifsSesInfo *ses;
struct cifsTconInfo *tcon;
+ struct cifsInodeInfo *pCifsInode;
struct cifsFileInfo *netfile;
cFYI(1, ("Checking for oplock break or dnotify response"));
@@ -549,42 +545,46 @@ is_valid_oplock_break(struct smb_hdr *buf, struct TCP_Server_Info *srv)
return false;
/* look up tcon based on tid & uid */
- read_lock(&GlobalSMBSeslock);
- list_for_each(tmp, &GlobalTreeConnectionList) {
- tcon = list_entry(tmp, struct cifsTconInfo, cifsConnectionList);
- if ((tcon->tid == buf->Tid) && (srv == tcon->ses->server)) {
+ spin_lock(&srv->smb_session_lock);
+ list_for_each(tmp, &srv->smb_session_list) {
+ ses = list_entry(tmp, struct cifsSesInfo, smb_session_list);
+ spin_lock(&ses->tcon_lock);
+ list_for_each(tmp1, &ses->tcon_list) {
+ tcon = list_entry(tmp1, struct cifsTconInfo, tcon_list);
+ if (tcon->tid != buf->Tid)
+ continue;
+
cifs_stats_inc(&tcon->num_oplock_brks);
- list_for_each(tmp1, &tcon->openFileList) {
- netfile = list_entry(tmp1, struct cifsFileInfo,
+ list_for_each(tmp2, &tcon->openFileList) {
+ netfile = list_entry(tmp2, struct cifsFileInfo,
tlist);
- if (pSMB->Fid == netfile->netfid) {
- struct cifsInodeInfo *pCifsInode;
- read_unlock(&GlobalSMBSeslock);
- cFYI(1,
- ("file id match, oplock break"));
- pCifsInode =
- CIFS_I(netfile->pInode);
- pCifsInode->clientCanCacheAll = false;
- if (pSMB->OplockLevel == 0)
- pCifsInode->clientCanCacheRead
- = false;
- pCifsInode->oplockPending = true;
- AllocOplockQEntry(netfile->pInode,
- netfile->netfid,
- tcon);
- cFYI(1,
- ("about to wake up oplock thread"));
- if (oplockThread)
- wake_up_process(oplockThread);
- return true;
- }
+ if (pSMB->Fid != netfile->netfid)
+ continue;
+
+ spin_unlock(&ses->tcon_lock);
+ spin_unlock(&srv->smb_session_lock);
+ cFYI(1, ("file id match, oplock break"));
+ pCifsInode = CIFS_I(netfile->pInode);
+ pCifsInode->clientCanCacheAll = false;
+ if (pSMB->OplockLevel == 0)
+ pCifsInode->clientCanCacheRead = false;
+ pCifsInode->oplockPending = true;
+ AllocOplockQEntry(netfile->pInode,
+ netfile->netfid, tcon);
+ cFYI(1, ("about to wake up oplock thread"));
+ if (oplockThread)
+ wake_up_process(oplockThread);
+
+ return true;
}
- read_unlock(&GlobalSMBSeslock);
+ spin_unlock(&ses->tcon_lock);
+ spin_unlock(&srv->smb_session_lock);
cFYI(1, ("No matching file for oplock break"));
return true;
}
+ spin_unlock(&ses->tcon_lock);
}
- read_unlock(&GlobalSMBSeslock);
+ spin_unlock(&srv->smb_session_lock);
cFYI(1, ("Can not process oplock break for non-existent connection"));
return true;
}
--
1.5.5.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists