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file.c
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/*
* fs/cifs/file.c
*
* vfs operations that deal with files
*
* Copyright (C) International Business Machines Corp., 2002,2010
* Author(s): Steve French (sfrench@us.ibm.com)
* Jeremy Allison (jra@samba.org)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/backing-dev.h>
#include <linux/stat.h>
#include <linux/fcntl.h>
#include <linux/pagemap.h>
#include <linux/pagevec.h>
#include <linux/writeback.h>
#include <linux/task_io_accounting_ops.h>
#include <linux/delay.h>
#include <linux/mount.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "fscache.h"
static inline int cifs_convert_flags(unsigned int flags)
{
if ((flags & O_ACCMODE) == O_RDONLY)
return GENERIC_READ;
else if ((flags & O_ACCMODE) == O_WRONLY)
return GENERIC_WRITE;
else if ((flags & O_ACCMODE) == O_RDWR) {
/* GENERIC_ALL is too much permission to request
can cause unnecessary access denied on create */
/* return GENERIC_ALL; */
return (GENERIC_READ | GENERIC_WRITE);
}
return (READ_CONTROL | FILE_WRITE_ATTRIBUTES | FILE_READ_ATTRIBUTES |
FILE_WRITE_EA | FILE_APPEND_DATA | FILE_WRITE_DATA |
FILE_READ_DATA);
}
static u32 cifs_posix_convert_flags(unsigned int flags)
{
u32 posix_flags = 0;
if ((flags & O_ACCMODE) == O_RDONLY)
posix_flags = SMB_O_RDONLY;
else if ((flags & O_ACCMODE) == O_WRONLY)
posix_flags = SMB_O_WRONLY;
else if ((flags & O_ACCMODE) == O_RDWR)
posix_flags = SMB_O_RDWR;
if (flags & O_CREAT)
posix_flags |= SMB_O_CREAT;
if (flags & O_EXCL)
posix_flags |= SMB_O_EXCL;
if (flags & O_TRUNC)
posix_flags |= SMB_O_TRUNC;
/* be safe and imply O_SYNC for O_DSYNC */
if (flags & O_DSYNC)
posix_flags |= SMB_O_SYNC;
if (flags & O_DIRECTORY)
posix_flags |= SMB_O_DIRECTORY;
if (flags & O_NOFOLLOW)
posix_flags |= SMB_O_NOFOLLOW;
if (flags & O_DIRECT)
posix_flags |= SMB_O_DIRECT;
return posix_flags;
}
static inline int cifs_get_disposition(unsigned int flags)
{
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
return FILE_CREATE;
else if ((flags & (O_CREAT | O_TRUNC)) == (O_CREAT | O_TRUNC))
return FILE_OVERWRITE_IF;
else if ((flags & O_CREAT) == O_CREAT)
return FILE_OPEN_IF;
else if ((flags & O_TRUNC) == O_TRUNC)
return FILE_OVERWRITE;
else
return FILE_OPEN;
}
int cifs_posix_open(char *full_path, struct inode **pinode,
struct super_block *sb, int mode, unsigned int f_flags,
__u32 *poplock, __u16 *pnetfid, int xid)
{
int rc;
FILE_UNIX_BASIC_INFO *presp_data;
__u32 posix_flags = 0;
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_fattr fattr;
struct tcon_link *tlink;
struct cifs_tcon *tcon;
cFYI(1, "posix open %s", full_path);
presp_data = kzalloc(sizeof(FILE_UNIX_BASIC_INFO), GFP_KERNEL);
if (presp_data == NULL)
return -ENOMEM;
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
rc = PTR_ERR(tlink);
goto posix_open_ret;
}
tcon = tlink_tcon(tlink);
mode &= ~current_umask();
posix_flags = cifs_posix_convert_flags(f_flags);
rc = CIFSPOSIXCreate(xid, tcon, posix_flags, mode, pnetfid, presp_data,
poplock, full_path, cifs_sb->local_nls,
cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
cifs_put_tlink(tlink);
if (rc)
goto posix_open_ret;
if (presp_data->Type == cpu_to_le32(-1))
goto posix_open_ret; /* open ok, caller does qpathinfo */
if (!pinode)
goto posix_open_ret; /* caller does not need info */
cifs_unix_basic_to_fattr(&fattr, presp_data, cifs_sb);
/* get new inode and set it up */
if (*pinode == NULL) {
cifs_fill_uniqueid(sb, &fattr);
*pinode = cifs_iget(sb, &fattr);
if (!*pinode) {
rc = -ENOMEM;
goto posix_open_ret;
}
} else {
cifs_fattr_to_inode(*pinode, &fattr);
}
posix_open_ret:
kfree(presp_data);
return rc;
}
static int
cifs_nt_open(char *full_path, struct inode *inode, struct cifs_sb_info *cifs_sb,
struct cifs_tcon *tcon, unsigned int f_flags, __u32 *poplock,
__u16 *pnetfid, int xid)
{
int rc;
int desiredAccess;
int disposition;
int create_options = CREATE_NOT_DIR;
FILE_ALL_INFO *buf;
desiredAccess = cifs_convert_flags(f_flags);
/*********************************************************************
* open flag mapping table:
*
* POSIX Flag CIFS Disposition
* ---------- ----------------
* O_CREAT FILE_OPEN_IF
* O_CREAT | O_EXCL FILE_CREATE
* O_CREAT | O_TRUNC FILE_OVERWRITE_IF
* O_TRUNC FILE_OVERWRITE
* none of the above FILE_OPEN
*
* Note that there is not a direct match between disposition
* FILE_SUPERSEDE (ie create whether or not file exists although
* O_CREAT | O_TRUNC is similar but truncates the existing
* file rather than creating a new file as FILE_SUPERSEDE does
* (which uses the attributes / metadata passed in on open call)
*?
*? O_SYNC is a reasonable match to CIFS writethrough flag
*? and the read write flags match reasonably. O_LARGEFILE
*? is irrelevant because largefile support is always used
*? by this client. Flags O_APPEND, O_DIRECT, O_DIRECTORY,
* O_FASYNC, O_NOFOLLOW, O_NONBLOCK need further investigation
*********************************************************************/
disposition = cifs_get_disposition(f_flags);
/* BB pass O_SYNC flag through on file attributes .. BB */
buf = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);
if (!buf)
return -ENOMEM;
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
if (tcon->ses->capabilities & CAP_NT_SMBS)
rc = CIFSSMBOpen(xid, tcon, full_path, disposition,
desiredAccess, create_options, pnetfid, poplock, buf,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR);
else
rc = SMBLegacyOpen(xid, tcon, full_path, disposition,
desiredAccess, CREATE_NOT_DIR, pnetfid, poplock, buf,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags
& CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc)
goto out;
if (tcon->unix_ext)
rc = cifs_get_inode_info_unix(&inode, full_path, inode->i_sb,
xid);
else
rc = cifs_get_inode_info(&inode, full_path, buf, inode->i_sb,
xid, pnetfid);
out:
kfree(buf);
return rc;
}
struct cifsFileInfo *
cifs_new_fileinfo(__u16 fileHandle, struct file *file,
struct tcon_link *tlink, __u32 oplock)
{
struct dentry *dentry = file->f_path.dentry;
struct inode *inode = dentry->d_inode;
struct cifsInodeInfo *pCifsInode = CIFS_I(inode);
struct cifsFileInfo *pCifsFile;
pCifsFile = kzalloc(sizeof(struct cifsFileInfo), GFP_KERNEL);
if (pCifsFile == NULL)
return pCifsFile;
pCifsFile->count = 1;
pCifsFile->netfid = fileHandle;
pCifsFile->pid = current->tgid;
pCifsFile->uid = current_fsuid();
pCifsFile->dentry = dget(dentry);
pCifsFile->f_flags = file->f_flags;
pCifsFile->invalidHandle = false;
pCifsFile->tlink = cifs_get_tlink(tlink);
mutex_init(&pCifsFile->fh_mutex);
INIT_WORK(&pCifsFile->oplock_break, cifs_oplock_break);
spin_lock(&cifs_file_list_lock);
list_add(&pCifsFile->tlist, &(tlink_tcon(tlink)->openFileList));
/* if readable file instance put first in list*/
if (file->f_mode & FMODE_READ)
list_add(&pCifsFile->flist, &pCifsInode->openFileList);
else
list_add_tail(&pCifsFile->flist, &pCifsInode->openFileList);
spin_unlock(&cifs_file_list_lock);
cifs_set_oplock_level(pCifsInode, oplock);
pCifsInode->can_cache_brlcks = pCifsInode->clientCanCacheAll;
file->private_data = pCifsFile;
return pCifsFile;
}
static void cifs_del_lock_waiters(struct cifsLockInfo *lock);
/*
* Release a reference on the file private data. This may involve closing
* the filehandle out on the server. Must be called without holding
* cifs_file_list_lock.
*/
void cifsFileInfo_put(struct cifsFileInfo *cifs_file)
{
struct inode *inode = cifs_file->dentry->d_inode;
struct cifs_tcon *tcon = tlink_tcon(cifs_file->tlink);
struct cifsInodeInfo *cifsi = CIFS_I(inode);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsLockInfo *li, *tmp;
spin_lock(&cifs_file_list_lock);
if (--cifs_file->count > 0) {
spin_unlock(&cifs_file_list_lock);
return;
}
/* remove it from the lists */
list_del(&cifs_file->flist);
list_del(&cifs_file->tlist);
if (list_empty(&cifsi->openFileList)) {
cFYI(1, "closing last open instance for inode %p",
cifs_file->dentry->d_inode);
/* in strict cache mode we need invalidate mapping on the last
close because it may cause a error when we open this file
again and get at least level II oplock */
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_STRICT_IO)
CIFS_I(inode)->invalid_mapping = true;
cifs_set_oplock_level(cifsi, 0);
}
spin_unlock(&cifs_file_list_lock);
cancel_work_sync(&cifs_file->oplock_break);
if (!tcon->need_reconnect && !cifs_file->invalidHandle) {
int xid, rc;
xid = GetXid();
rc = CIFSSMBClose(xid, tcon, cifs_file->netfid);
FreeXid(xid);
}
/* Delete any outstanding lock records. We'll lose them when the file
* is closed anyway.
*/
mutex_lock(&cifsi->lock_mutex);
list_for_each_entry_safe(li, tmp, &cifsi->llist, llist) {
if (li->netfid != cifs_file->netfid)
continue;
list_del(&li->llist);
cifs_del_lock_waiters(li);
kfree(li);
}
mutex_unlock(&cifsi->lock_mutex);
cifs_put_tlink(cifs_file->tlink);
dput(cifs_file->dentry);
kfree(cifs_file);
}
int cifs_open(struct inode *inode, struct file *file)
{
int rc = -EACCES;
int xid;
__u32 oplock;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *tcon;
struct tcon_link *tlink;
struct cifsFileInfo *pCifsFile = NULL;
char *full_path = NULL;
bool posix_open_ok = false;
__u16 netfid;
xid = GetXid();
cifs_sb = CIFS_SB(inode->i_sb);
tlink = cifs_sb_tlink(cifs_sb);
if (IS_ERR(tlink)) {
FreeXid(xid);
return PTR_ERR(tlink);
}
tcon = tlink_tcon(tlink);
full_path = build_path_from_dentry(file->f_path.dentry);
if (full_path == NULL) {
rc = -ENOMEM;
goto out;
}
cFYI(1, "inode = 0x%p file flags are 0x%x for %s",
inode, file->f_flags, full_path);
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;
if (!tcon->broken_posix_open && tcon->unix_ext &&
(tcon->ses->capabilities & CAP_UNIX) &&
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
/* can not refresh inode info since size could be stale */
rc = cifs_posix_open(full_path, &inode, inode->i_sb,
cifs_sb->mnt_file_mode /* ignored */,
file->f_flags, &oplock, &netfid, xid);
if (rc == 0) {
cFYI(1, "posix open succeeded");
posix_open_ok = true;
} else if ((rc == -EINVAL) || (rc == -EOPNOTSUPP)) {
if (tcon->ses->serverNOS)
cERROR(1, "server %s of type %s returned"
" unexpected error on SMB posix open"
", disabling posix open support."
" Check if server update available.",
tcon->ses->serverName,
tcon->ses->serverNOS);
tcon->broken_posix_open = true;
} else if ((rc != -EIO) && (rc != -EREMOTE) &&
(rc != -EOPNOTSUPP)) /* path not found or net err */
goto out;
/* else fallthrough to retry open the old way on network i/o
or DFS errors */
}
if (!posix_open_ok) {
rc = cifs_nt_open(full_path, inode, cifs_sb, tcon,
file->f_flags, &oplock, &netfid, xid);
if (rc)
goto out;
}
pCifsFile = cifs_new_fileinfo(netfid, file, tlink, oplock);
if (pCifsFile == NULL) {
CIFSSMBClose(xid, tcon, netfid);
rc = -ENOMEM;
goto out;
}
cifs_fscache_set_inode_cookie(inode, file);
if ((oplock & CIFS_CREATE_ACTION) && !posix_open_ok && tcon->unix_ext) {
/* time to set mode which we can not set earlier due to
problems creating new read-only files */
struct cifs_unix_set_info_args args = {
.mode = inode->i_mode,
.uid = NO_CHANGE_64,
.gid = NO_CHANGE_64,
.ctime = NO_CHANGE_64,
.atime = NO_CHANGE_64,
.mtime = NO_CHANGE_64,
.device = 0,
};
CIFSSMBUnixSetFileInfo(xid, tcon, &args, netfid,
pCifsFile->pid);
}
out:
kfree(full_path);
FreeXid(xid);
cifs_put_tlink(tlink);
return rc;
}
/* Try to reacquire byte range locks that were released when session */
/* to server was lost */
static int cifs_relock_file(struct cifsFileInfo *cifsFile)
{
int rc = 0;
/* BB list all locks open on this file and relock */
return rc;
}
static int cifs_reopen_file(struct cifsFileInfo *pCifsFile, bool can_flush)
{
int rc = -EACCES;
int xid;
__u32 oplock;
struct cifs_sb_info *cifs_sb;
struct cifs_tcon *tcon;
struct cifsInodeInfo *pCifsInode;
struct inode *inode;
char *full_path = NULL;
int desiredAccess;
int disposition = FILE_OPEN;
int create_options = CREATE_NOT_DIR;
__u16 netfid;
xid = GetXid();
mutex_lock(&pCifsFile->fh_mutex);
if (!pCifsFile->invalidHandle) {
mutex_unlock(&pCifsFile->fh_mutex);
rc = 0;
FreeXid(xid);
return rc;
}
inode = pCifsFile->dentry->d_inode;
cifs_sb = CIFS_SB(inode->i_sb);
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
to get called and if the server was down that means we end up here,
and we can never tell if the caller already has the rename_sem */
full_path = build_path_from_dentry(pCifsFile->dentry);
if (full_path == NULL) {
rc = -ENOMEM;
mutex_unlock(&pCifsFile->fh_mutex);
FreeXid(xid);
return rc;
}
cFYI(1, "inode = 0x%p file flags 0x%x for %s",
inode, pCifsFile->f_flags, full_path);
if (tcon->ses->server->oplocks)
oplock = REQ_OPLOCK;
else
oplock = 0;
if (tcon->unix_ext && (tcon->ses->capabilities & CAP_UNIX) &&
(CIFS_UNIX_POSIX_PATH_OPS_CAP &
le64_to_cpu(tcon->fsUnixInfo.Capability))) {
/*
* O_CREAT, O_EXCL and O_TRUNC already had their effect on the
* original open. Must mask them off for a reopen.
*/
unsigned int oflags = pCifsFile->f_flags &
~(O_CREAT | O_EXCL | O_TRUNC);
rc = cifs_posix_open(full_path, NULL, inode->i_sb,
cifs_sb->mnt_file_mode /* ignored */,
oflags, &oplock, &netfid, xid);
if (rc == 0) {
cFYI(1, "posix reopen succeeded");
goto reopen_success;
}
/* fallthrough to retry open the old way on errors, especially
in the reconnect path it is important to retry hard */
}
desiredAccess = cifs_convert_flags(pCifsFile->f_flags);
if (backup_cred(cifs_sb))
create_options |= CREATE_OPEN_BACKUP_INTENT;
/* Can not refresh inode by passing in file_info buf to be returned
by SMBOpen and then calling get_inode_info with returned buf
since file might have write behind data that needs to be flushed
and server version of file size can be stale. If we knew for sure
that inode was not dirty locally we could do this */
rc = CIFSSMBOpen(xid, tcon, full_path, disposition, desiredAccess,
create_options, &netfid, &oplock, NULL,
cifs_sb->local_nls, cifs_sb->mnt_cifs_flags &
CIFS_MOUNT_MAP_SPECIAL_CHR);
if (rc) {
mutex_unlock(&pCifsFile->fh_mutex);
cFYI(1, "cifs_open returned 0x%x", rc);
cFYI(1, "oplock: %d", oplock);
goto reopen_error_exit;
}
reopen_success:
pCifsFile->netfid = netfid;
pCifsFile->invalidHandle = false;
mutex_unlock(&pCifsFile->fh_mutex);
pCifsInode = CIFS_I(inode);
if (can_flush) {
rc = filemap_write_and_wait(inode->i_mapping);
mapping_set_error(inode->i_mapping, rc);
if (tcon->unix_ext)
rc = cifs_get_inode_info_unix(&inode,
full_path, inode->i_sb, xid);
else
rc = cifs_get_inode_info(&inode,
full_path, NULL, inode->i_sb,
xid, NULL);
} /* else we are writing out data to server already
and could deadlock if we tried to flush data, and
since we do not know if we have data that would
invalidate the current end of file on the server
we can not go to the server to get the new inod
info */
cifs_set_oplock_level(pCifsInode, oplock);
cifs_relock_file(pCifsFile);
reopen_error_exit:
kfree(full_path);
FreeXid(xid);
return rc;
}
int cifs_close(struct inode *inode, struct file *file)
{
if (file->private_data != NULL) {
cifsFileInfo_put(file->private_data);
file->private_data = NULL;
}
/* return code from the ->release op is always ignored */
return 0;
}
int cifs_closedir(struct inode *inode, struct file *file)
{
int rc = 0;
int xid;
struct cifsFileInfo *pCFileStruct = file->private_data;
char *ptmp;
cFYI(1, "Closedir inode = 0x%p", inode);
xid = GetXid();
if (pCFileStruct) {
struct cifs_tcon *pTcon = tlink_tcon(pCFileStruct->tlink);
cFYI(1, "Freeing private data in close dir");
spin_lock(&cifs_file_list_lock);
if (!pCFileStruct->srch_inf.endOfSearch &&
!pCFileStruct->invalidHandle) {
pCFileStruct->invalidHandle = true;
spin_unlock(&cifs_file_list_lock);
rc = CIFSFindClose(xid, pTcon, pCFileStruct->netfid);
cFYI(1, "Closing uncompleted readdir with rc %d",
rc);
/* not much we can do if it fails anyway, ignore rc */
rc = 0;
} else
spin_unlock(&cifs_file_list_lock);
ptmp = pCFileStruct->srch_inf.ntwrk_buf_start;
if (ptmp) {
cFYI(1, "closedir free smb buf in srch struct");
pCFileStruct->srch_inf.ntwrk_buf_start = NULL;
if (pCFileStruct->srch_inf.smallBuf)
cifs_small_buf_release(ptmp);
else
cifs_buf_release(ptmp);
}
cifs_put_tlink(pCFileStruct->tlink);
kfree(file->private_data);
file->private_data = NULL;
}
/* BB can we lock the filestruct while this is going on? */
FreeXid(xid);
return rc;
}
static struct cifsLockInfo *
cifs_lock_init(__u64 offset, __u64 length, __u8 type, __u16 netfid)
{
struct cifsLockInfo *lock =
kmalloc(sizeof(struct cifsLockInfo), GFP_KERNEL);
if (!lock)
return lock;
lock->offset = offset;
lock->length = length;
lock->type = type;
lock->netfid = netfid;
lock->pid = current->tgid;
INIT_LIST_HEAD(&lock->blist);
init_waitqueue_head(&lock->block_q);
return lock;
}
static void
cifs_del_lock_waiters(struct cifsLockInfo *lock)
{
struct cifsLockInfo *li, *tmp;
list_for_each_entry_safe(li, tmp, &lock->blist, blist) {
list_del_init(&li->blist);
wake_up(&li->block_q);
}
}
static bool
__cifs_find_lock_conflict(struct cifsInodeInfo *cinode, __u64 offset,
__u64 length, __u8 type, __u16 netfid,
struct cifsLockInfo **conf_lock)
{
struct cifsLockInfo *li, *tmp;
list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
if (offset + length <= li->offset ||
offset >= li->offset + li->length)
continue;
else if ((type & LOCKING_ANDX_SHARED_LOCK) &&
((netfid == li->netfid && current->tgid == li->pid) ||
type == li->type))
continue;
else {
*conf_lock = li;
return true;
}
}
return false;
}
static bool
cifs_find_lock_conflict(struct cifsInodeInfo *cinode, struct cifsLockInfo *lock,
struct cifsLockInfo **conf_lock)
{
return __cifs_find_lock_conflict(cinode, lock->offset, lock->length,
lock->type, lock->netfid, conf_lock);
}
/*
* Check if there is another lock that prevents us to set the lock (mandatory
* style). If such a lock exists, update the flock structure with its
* properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
* or leave it the same if we can't. Returns 0 if we don't need to request to
* the server or 1 otherwise.
*/
static int
cifs_lock_test(struct cifsInodeInfo *cinode, __u64 offset, __u64 length,
__u8 type, __u16 netfid, struct file_lock *flock)
{
int rc = 0;
struct cifsLockInfo *conf_lock;
bool exist;
mutex_lock(&cinode->lock_mutex);
exist = __cifs_find_lock_conflict(cinode, offset, length, type, netfid,
&conf_lock);
if (exist) {
flock->fl_start = conf_lock->offset;
flock->fl_end = conf_lock->offset + conf_lock->length - 1;
flock->fl_pid = conf_lock->pid;
if (conf_lock->type & LOCKING_ANDX_SHARED_LOCK)
flock->fl_type = F_RDLCK;
else
flock->fl_type = F_WRLCK;
} else if (!cinode->can_cache_brlcks)
rc = 1;
else
flock->fl_type = F_UNLCK;
mutex_unlock(&cinode->lock_mutex);
return rc;
}
static void
cifs_lock_add(struct cifsInodeInfo *cinode, struct cifsLockInfo *lock)
{
mutex_lock(&cinode->lock_mutex);
list_add_tail(&lock->llist, &cinode->llist);
mutex_unlock(&cinode->lock_mutex);
}
/*
* Set the byte-range lock (mandatory style). Returns:
* 1) 0, if we set the lock and don't need to request to the server;
* 2) 1, if no locks prevent us but we need to request to the server;
* 3) -EACCESS, if there is a lock that prevents us and wait is false.
*/
static int
cifs_lock_add_if(struct cifsInodeInfo *cinode, struct cifsLockInfo *lock,
bool wait)
{
struct cifsLockInfo *conf_lock;
bool exist;
int rc = 0;
try_again:
exist = false;
mutex_lock(&cinode->lock_mutex);
exist = cifs_find_lock_conflict(cinode, lock, &conf_lock);
if (!exist && cinode->can_cache_brlcks) {
list_add_tail(&lock->llist, &cinode->llist);
mutex_unlock(&cinode->lock_mutex);
return rc;
}
if (!exist)
rc = 1;
else if (!wait)
rc = -EACCES;
else {
list_add_tail(&lock->blist, &conf_lock->blist);
mutex_unlock(&cinode->lock_mutex);
rc = wait_event_interruptible(lock->block_q,
(lock->blist.prev == &lock->blist) &&
(lock->blist.next == &lock->blist));
if (!rc)
goto try_again;
mutex_lock(&cinode->lock_mutex);
list_del_init(&lock->blist);
}
mutex_unlock(&cinode->lock_mutex);
return rc;
}
/*
* Check if there is another lock that prevents us to set the lock (posix
* style). If such a lock exists, update the flock structure with its
* properties. Otherwise, set the flock type to F_UNLCK if we can cache brlocks
* or leave it the same if we can't. Returns 0 if we don't need to request to
* the server or 1 otherwise.
*/
static int
cifs_posix_lock_test(struct file *file, struct file_lock *flock)
{
int rc = 0;
struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
unsigned char saved_type = flock->fl_type;
if ((flock->fl_flags & FL_POSIX) == 0)
return 1;
mutex_lock(&cinode->lock_mutex);
posix_test_lock(file, flock);
if (flock->fl_type == F_UNLCK && !cinode->can_cache_brlcks) {
flock->fl_type = saved_type;
rc = 1;
}
mutex_unlock(&cinode->lock_mutex);
return rc;
}
/*
* Set the byte-range lock (posix style). Returns:
* 1) 0, if we set the lock and don't need to request to the server;
* 2) 1, if we need to request to the server;
* 3) <0, if the error occurs while setting the lock.
*/
static int
cifs_posix_lock_set(struct file *file, struct file_lock *flock)
{
struct cifsInodeInfo *cinode = CIFS_I(file->f_path.dentry->d_inode);
int rc = 1;
if ((flock->fl_flags & FL_POSIX) == 0)
return rc;
mutex_lock(&cinode->lock_mutex);
if (!cinode->can_cache_brlcks) {
mutex_unlock(&cinode->lock_mutex);
return rc;
}
rc = posix_lock_file_wait(file, flock);
mutex_unlock(&cinode->lock_mutex);
return rc;
}
static int
cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
{
int xid, rc = 0, stored_rc;
struct cifsLockInfo *li, *tmp;
struct cifs_tcon *tcon;
struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
unsigned int num, max_num;
LOCKING_ANDX_RANGE *buf, *cur;
int types[] = {LOCKING_ANDX_LARGE_FILES,
LOCKING_ANDX_SHARED_LOCK | LOCKING_ANDX_LARGE_FILES};
int i;
xid = GetXid();
tcon = tlink_tcon(cfile->tlink);
mutex_lock(&cinode->lock_mutex);
if (!cinode->can_cache_brlcks) {
mutex_unlock(&cinode->lock_mutex);
FreeXid(xid);
return rc;
}
max_num = (tcon->ses->server->maxBuf - sizeof(struct smb_hdr)) /
sizeof(LOCKING_ANDX_RANGE);
buf = kzalloc(max_num * sizeof(LOCKING_ANDX_RANGE), GFP_KERNEL);
if (!buf) {
mutex_unlock(&cinode->lock_mutex);
FreeXid(xid);
return rc;
}
for (i = 0; i < 2; i++) {
cur = buf;
num = 0;
list_for_each_entry_safe(li, tmp, &cinode->llist, llist) {
if (li->type != types[i])
continue;
cur->Pid = cpu_to_le16(li->pid);
cur->LengthLow = cpu_to_le32((u32)li->length);
cur->LengthHigh = cpu_to_le32((u32)(li->length>>32));
cur->OffsetLow = cpu_to_le32((u32)li->offset);
cur->OffsetHigh = cpu_to_le32((u32)(li->offset>>32));
if (++num == max_num) {
stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
li->type, 0, num, buf);
if (stored_rc)
rc = stored_rc;
cur = buf;
num = 0;
} else
cur++;
}
if (num) {
stored_rc = cifs_lockv(xid, tcon, cfile->netfid,
types[i], 0, num, buf);
if (stored_rc)
rc = stored_rc;
}
}
cinode->can_cache_brlcks = false;
mutex_unlock(&cinode->lock_mutex);
kfree(buf);
FreeXid(xid);
return rc;
}
/* copied from fs/locks.c with a name change */
#define cifs_for_each_lock(inode, lockp) \
for (lockp = &inode->i_flock; *lockp != NULL; \
lockp = &(*lockp)->fl_next)
struct lock_to_push {
struct list_head llist;
__u64 offset;
__u64 length;
__u32 pid;
__u16 netfid;
__u8 type;
};
static int
cifs_push_posix_locks(struct cifsFileInfo *cfile)
{
struct cifsInodeInfo *cinode = CIFS_I(cfile->dentry->d_inode);
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct file_lock *flock, **before;
unsigned int count = 0, i = 0;
int rc = 0, xid, type;
struct list_head locks_to_send, *el;
struct lock_to_push *lck, *tmp;
__u64 length;
xid = GetXid();
mutex_lock(&cinode->lock_mutex);
if (!cinode->can_cache_brlcks) {
mutex_unlock(&cinode->lock_mutex);
FreeXid(xid);
return rc;
}
lock_flocks();
cifs_for_each_lock(cfile->dentry->d_inode, before) {
if ((*before)->fl_flags & FL_POSIX)
count++;
}
unlock_flocks();
INIT_LIST_HEAD(&locks_to_send);
/*
* Allocating count locks is enough because no FL_POSIX locks can be
* added to the list while we are holding cinode->lock_mutex that
* protects locking operations of this inode.
*/
for (; i < count; i++) {
lck = kmalloc(sizeof(struct lock_to_push), GFP_KERNEL);
if (!lck) {
rc = -ENOMEM;
goto err_out;
}
list_add_tail(&lck->llist, &locks_to_send);
}
el = locks_to_send.next;
lock_flocks();
cifs_for_each_lock(cfile->dentry->d_inode, before) {
flock = *before;
if ((flock->fl_flags & FL_POSIX) == 0)
continue;
if (el == &locks_to_send) {
/*
* The list ended. We don't have enough allocated
* structures - something is really wrong.
*/
cERROR(1, "Can't push all brlocks!");
break;
}
length = 1 + flock->fl_end - flock->fl_start;
if (flock->fl_type == F_RDLCK || flock->fl_type == F_SHLCK)
type = CIFS_RDLCK;
else
type = CIFS_WRLCK;
lck = list_entry(el, struct lock_to_push, llist);
lck->pid = flock->fl_pid;
lck->netfid = cfile->netfid;
lck->length = length;
lck->type = type;
lck->offset = flock->fl_start;