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Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6

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Pull CIFS fixes from Steve French:
 "Misc small cifs fixes"

* 'for-next' of git://git.samba.org/sfrench/cifs-2.6:
  CIFS: Don't let read only caching for mandatory byte-range locked files
  CIFS: Fix write after setting a read lock for read oplock files
  Revert "CIFS: Fix write after setting a read lock for read oplock files"
  cifs: adjust sequence number downward after signing NT_CANCEL request
  cifs: move check for NULL socket into smb_send_rqst
This commit is contained in:
Linus Torvalds 2013-01-07 13:21:55 -08:00
commit 127aa93066
6 changed files with 90 additions and 70 deletions
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1
fs/cifs/cifsfs.c
View File

@ -228,7 +228,6 @@ cifs_alloc_inode(struct super_block *sb)
cifs_set_oplock_level(cifs_inode, 0);
cifs_inode->delete_pending = false;
cifs_inode->invalid_mapping = false;
cifs_inode->leave_pages_clean = false;
cifs_inode->vfs_inode.i_blkbits = 14; /* 2**14 = CIFS_MAX_MSGSIZE */
cifs_inode->server_eof = 0;
cifs_inode->uniqueid = 0;

2
fs/cifs/cifsglob.h
View File

@ -386,6 +386,7 @@ struct smb_version_values {
unsigned int cap_unix;
unsigned int cap_nt_find;
unsigned int cap_large_files;
unsigned int oplock_read;
};
#define HEADER_SIZE(server) (server->vals->header_size)
@ -1030,7 +1031,6 @@ struct cifsInodeInfo {
bool clientCanCacheAll; /* read and writebehind oplock */
bool delete_pending; /* DELETE_ON_CLOSE is set */
bool invalid_mapping; /* pagecache is invalid */
bool leave_pages_clean; /* protected by i_mutex, not set pages dirty */
unsigned long time; /* jiffies of last update of inode */
u64 server_eof; /* current file size on server -- protected by i_lock */
u64 uniqueid; /* server inode number */

141
fs/cifs/file.c
View File

@ -238,6 +238,23 @@ cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
return rc;
}
static bool
cifs_has_mand_locks(struct cifsInodeInfo *cinode)
{
struct cifs_fid_locks *cur;
bool has_locks = false;
down_read(&cinode->lock_sem);
list_for_each_entry(cur, &cinode->llist, llist) {
if (!list_empty(&cur->locks)) {
has_locks = true;
break;
}
}
up_read(&cinode->lock_sem);
return has_locks;
}
struct cifsFileInfo *
cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
struct tcon_link *tlink, __u32 oplock)
@ -248,6 +265,7 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
struct cifsFileInfo *cfile;
struct cifs_fid_locks *fdlocks;
struct cifs_tcon *tcon = tlink_tcon(tlink);
struct TCP_Server_Info *server = tcon->ses->server;
cfile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
if (cfile == NULL)
@ -276,12 +294,22 @@ cifs_new_fileinfo(struct cifs_fid *fid, struct file *file,
INIT_WORK(&cfile->oplock_break, cifs_oplock_break);
mutex_init(&cfile->fh_mutex);
/*
* If the server returned a read oplock and we have mandatory brlocks,
* set oplock level to None.
*/
if (oplock == server->vals->oplock_read &&
cifs_has_mand_locks(cinode)) {
cFYI(1, "Reset oplock val from read to None due to mand locks");
oplock = 0;
}
spin_lock(&cifs_file_list_lock);
if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE)
if (fid->pending_open->oplock != CIFS_OPLOCK_NO_CHANGE && oplock)
oplock = fid->pending_open->oplock;
list_del(&fid->pending_open->olist);
tlink_tcon(tlink)->ses->server->ops->set_fid(cfile, fid, oplock);
server->ops->set_fid(cfile, fid, oplock);
list_add(&cfile->tlist, &tcon->openFileList);
/* if readable file instance put first in list*/
@ -1422,6 +1450,7 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
struct inode *inode = cfile->dentry->d_inode;
if (posix_lck) {
int posix_lock_type;
@ -1459,6 +1488,21 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
if (!rc)
goto out;
/*
* Windows 7 server can delay breaking lease from read to None
* if we set a byte-range lock on a file - break it explicitly
* before sending the lock to the server to be sure the next
* read won't conflict with non-overlapted locks due to
* pagereading.
*/
if (!CIFS_I(inode)->clientCanCacheAll &&
CIFS_I(inode)->clientCanCacheRead) {
cifs_invalidate_mapping(inode);
cFYI(1, "Set no oplock for inode=%p due to mand locks",
inode);
CIFS_I(inode)->clientCanCacheRead = false;
}
rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
type, 1, 0, wait_flag);
if (rc) {
@ -2103,15 +2147,7 @@ static int cifs_write_end(struct file *file, struct address_space *mapping,
} else {
rc = copied;
pos += copied;
/*
* When we use strict cache mode and cifs_strict_writev was run
* with level II oplock (indicated by leave_pages_clean field of
* CIFS_I(inode)), we can leave pages clean - cifs_strict_writev
* sent the data to the server itself.
*/
if (!CIFS_I(inode)->leave_pages_clean ||
!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO))
set_page_dirty(page);
set_page_dirty(page);
}
if (rc > 0) {
@ -2462,8 +2498,8 @@ ssize_t cifs_user_writev(struct kiocb *iocb, const struct iovec *iov,
}
static ssize_t
cifs_pagecache_writev(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos, bool cache_ex)
cifs_writev(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct file *file = iocb->ki_filp;
struct cifsFileInfo *cfile = (struct cifsFileInfo *)file->private_data;
@ -2485,12 +2521,8 @@ cifs_pagecache_writev(struct kiocb *iocb, const struct iovec *iov,
server->vals->exclusive_lock_type, NULL,
CIFS_WRITE_OP)) {
mutex_lock(&inode->i_mutex);
if (!cache_ex)
cinode->leave_pages_clean = true;
rc = __generic_file_aio_write(iocb, iov, nr_segs,
&iocb->ki_pos);
if (!cache_ex)
cinode->leave_pages_clean = false;
&iocb->ki_pos);
mutex_unlock(&inode->i_mutex);
}
@ -2517,60 +2549,32 @@ cifs_strict_writev(struct kiocb *iocb, const struct iovec *iov,
struct cifsFileInfo *cfile = (struct cifsFileInfo *)
iocb->ki_filp->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
ssize_t written, written2;
/*
* We need to store clientCanCacheAll here to prevent race
* conditions - this value can be changed during an execution
* of generic_file_aio_write. For CIFS it can be changed from
* true to false only, but for SMB2 it can be changed both from
* true to false and vice versa. So, we can end up with a data
* stored in the cache, not marked dirty and not sent to the
* server if this value changes its state from false to true
* after cifs_write_end.
*/
bool cache_ex = cinode->clientCanCacheAll;
bool cache_read = cinode->clientCanCacheRead;
int rc;
loff_t saved_pos;
ssize_t written;
if (cache_ex) {
if (cinode->clientCanCacheAll) {
if (cap_unix(tcon->ses) &&
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) &&
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(
tcon->fsUnixInfo.Capability)))
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(tcon->fsUnixInfo.Capability))
&& ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0))
return generic_file_aio_write(iocb, iov, nr_segs, pos);
return cifs_pagecache_writev(iocb, iov, nr_segs, pos, cache_ex);
return cifs_writev(iocb, iov, nr_segs, pos);
}
/*
* For files without exclusive oplock in strict cache mode we need to
* write the data to the server exactly from the pos to pos+len-1 rather
* than flush all affected pages because it may cause a error with
* mandatory locks on these pages but not on the region from pos to
* ppos+len-1.
* For non-oplocked files in strict cache mode we need to write the data
* to the server exactly from the pos to pos+len-1 rather than flush all
* affected pages because it may cause a error with mandatory locks on
* these pages but not on the region from pos to ppos+len-1.
*/
written = cifs_user_writev(iocb, iov, nr_segs, pos);
if (!cache_read || written <= 0)
return written;
saved_pos = iocb->ki_pos;
iocb->ki_pos = pos;
/* we have a read oplock - need to store a data in the page cache */
if (cap_unix(tcon->ses) &&
((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NOPOSIXBRL) == 0) &&
(CIFS_UNIX_FCNTL_CAP & le64_to_cpu(
tcon->fsUnixInfo.Capability)))
written2 = generic_file_aio_write(iocb, iov, nr_segs, pos);
else
written2 = cifs_pagecache_writev(iocb, iov, nr_segs, pos,
cache_ex);
/* errors occured during writing - invalidate the page cache */
if (written2 < 0) {
rc = cifs_invalidate_mapping(inode);
if (rc)
written = (ssize_t)rc;
else
iocb->ki_pos = saved_pos;
if (written > 0 && cinode->clientCanCacheRead) {
/*
* Windows 7 server can delay breaking level2 oplock if a write
* request comes - break it on the client to prevent reading
* an old data.
*/
cifs_invalidate_mapping(inode);
cFYI(1, "Set no oplock for inode=%p after a write operation",
inode);
cinode->clientCanCacheRead = false;
}
return written;
}
@ -3577,6 +3581,13 @@ void cifs_oplock_break(struct work_struct *work)
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
int rc = 0;
if (!cinode->clientCanCacheAll && cinode->clientCanCacheRead &&
cifs_has_mand_locks(cinode)) {
cFYI(1, "Reset oplock to None for inode=%p due to mand locks",
inode);
cinode->clientCanCacheRead = false;
}
if (inode && S_ISREG(inode->i_mode)) {
if (cinode->clientCanCacheRead)
break_lease(inode, O_RDONLY);

8
fs/cifs/smb1ops.c
View File

@ -53,6 +53,13 @@ send_nt_cancel(struct TCP_Server_Info *server, void *buf,
mutex_unlock(&server->srv_mutex);
return rc;
}
/*
* The response to this call was already factored into the sequence
* number when the call went out, so we must adjust it back downward
* after signing here.
*/
--server->sequence_number;
rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));
mutex_unlock(&server->srv_mutex);
@ -952,4 +959,5 @@ struct smb_version_values smb1_values = {
.cap_unix = CAP_UNIX,
.cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,
.cap_large_files = CAP_LARGE_FILES,
.oplock_read = OPLOCK_READ,
};

2
fs/cifs/smb2ops.c
View File

@ -708,6 +708,7 @@ struct smb_version_values smb20_values = {
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
.cap_large_files = SMB2_LARGE_FILES,
.oplock_read = SMB2_OPLOCK_LEVEL_II,
};
struct smb_version_values smb21_values = {
@ -725,6 +726,7 @@ struct smb_version_values smb21_values = {
.cap_unix = 0,
.cap_nt_find = SMB2_NT_FIND,
.cap_large_files = SMB2_LARGE_FILES,
.oplock_read = SMB2_OPLOCK_LEVEL_II,
};
struct smb_version_values smb30_values = {

6
fs/cifs/transport.c
View File

@ -144,9 +144,6 @@ smb_send_kvec(struct TCP_Server_Info *server, struct kvec *iov, size_t n_vec,
*sent = 0;
if (ssocket == NULL)
return -ENOTSOCK; /* BB eventually add reconnect code here */
smb_msg.msg_name = (struct sockaddr *) &server->dstaddr;
smb_msg.msg_namelen = sizeof(struct sockaddr);
smb_msg.msg_control = NULL;
@ -291,6 +288,9 @@ smb_send_rqst(struct TCP_Server_Info *server, struct smb_rqst *rqst)
struct socket *ssocket = server->ssocket;
int val = 1;
if (ssocket == NULL)
return -ENOTSOCK;
cFYI(1, "Sending smb: smb_len=%u", smb_buf_length);
dump_smb(iov[0].iov_base, iov[0].iov_len);