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vfs.c
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/*
* fs/cifsd/vfs.c
*
* Copyright (C) 2015 Samsung Electronics Co., Ltd.
* Copyright (C) 2016 Namjae Jeon <namjae.jeon@protocolfreedom.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/backing-dev.h>
#include <linux/writeback.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 10, 30)
#include <linux/xattr.h>
#endif
#include <linux/falloc.h>
#include <linux/genhd.h>
#include <linux/blkdev.h>
#include "export.h"
#include "glob.h"
#include "oplock.h"
/**
* smb_vfs_create() - vfs helper for smb create file
* @name: file name
* @mode: file create mode
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_create(const char *name, umode_t mode)
{
struct path path;
struct dentry *dentry;
int err;
dentry = kern_path_create(AT_FDCWD, name, &path, 0);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
cifsd_err("path create failed for %s, err %d\n", name, err);
return err;
}
mode |= S_IFREG;
err = vfs_create(path.dentry->d_inode, dentry, mode, true);
if (err)
cifsd_err("File(%s): creation failed (err:%d)\n", name, err);
done_path_create(&path, dentry);
return err;
}
/**
* smb_vfs_mkdir() - vfs helper for smb create directory
* @name: directory name
* @mode: directory create mode
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_mkdir(const char *name, umode_t mode)
{
struct path path;
struct dentry *dentry;
int err;
dentry = kern_path_create(AT_FDCWD, name, &path, LOOKUP_DIRECTORY);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
if (err != -EEXIST)
cifsd_err("path create failed for %s, err %d\n",
name, err);
return err;
}
mode |= S_IFDIR;
err = vfs_mkdir(path.dentry->d_inode, dentry, mode);
if (err)
cifsd_err("mkdir(%s): creation failed (err:%d)\n", name, err);
done_path_create(&path, dentry);
return err;
}
/**
* smb_vfs_read() - vfs helper for smb file read
* @sess: session
* @fid: file id of open file
* @buf: buf containing read data
* @count: read byte count
* @pos: file pos
*
* Return: number of read bytes on success, otherwise error
*/
int smb_vfs_read(struct cifsd_sess *sess, uint64_t fid, uint64_t p_id,
char **buf, size_t count, loff_t *pos)
{
struct file *filp;
ssize_t nbytes;
mm_segment_t old_fs;
struct cifsd_file *fp;
char *rbuf, *name;
struct inode *inode;
char namebuf[NAME_MAX];
int ret;
fp = get_id_from_fidtable(sess, fid);
if (!fp) {
cifsd_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
filp = fp->filp;
inode = filp->f_path.dentry->d_inode;
if (S_ISDIR(inode->i_mode))
return -EISDIR;
if (unlikely(count == 0))
return 0;
#ifdef CONFIG_CIFS_SMB2_SERVER
if (fp->is_durable && fp->persistent_id != p_id) {
cifsd_err("persistent id mismatch : %llu, %llu\n",
fp->persistent_id, p_id);
return -ENOENT;
}
if (sess->conn->connection_type) {
if (!(fp->daccess & (FILE_READ_DATA_LE |
FILE_GENERIC_READ_LE | FILE_MAXIMAL_ACCESS_LE |
FILE_GENERIC_ALL_LE))) {
cifsd_err("no right to read(%llu)\n", fid);
return -EACCES;
}
}
#endif
rbuf = alloc_data_mem(count);
if (!rbuf)
return -ENOMEM;
if (fp->is_stream) {
ssize_t v_len;
char *stream_buf = NULL;
cifsd_debug("read stream data pos : %llu, count : %zd\n",
*pos, count);
v_len = smb_find_cont_xattr(&filp->f_path, fp->stream.name,
fp->stream.size, &stream_buf, 1);
if (v_len == -ENOENT) {
cifsd_err("not found stream in xattr : %zd\n", v_len);
kvfree(rbuf);
return -ENOENT;
}
memcpy(rbuf, &stream_buf[*pos], count);
*buf = rbuf;
return v_len > count ? count : v_len;
}
ret = check_lock_range(filp, *pos, *pos + count - 1,
READ);
if (ret) {
cifsd_err("%s: unable to read due to lock\n",
__func__);
kvfree(rbuf);
return -EAGAIN;
}
old_fs = get_fs();
set_fs(KERNEL_DS);
nbytes = vfs_read(filp, rbuf, count, pos);
set_fs(old_fs);
if (nbytes < 0) {
name = d_path(&filp->f_path, namebuf, sizeof(namebuf));
if (IS_ERR(name))
name = "(error)";
cifsd_err("smb read failed for (%s), err = %zd\n",
name, nbytes);
kvfree(rbuf);
} else {
*buf = rbuf;
filp->f_pos = *pos;
}
return nbytes;
}
/**
* smb_vfs_write() - vfs helper for smb file write
* @sess: session
* @fid: file id of open file
* @buf: buf containing data for writing
* @count: read byte count
* @pos: file pos
* @sync: fsync after write
* @written: number of bytes written
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_write(struct cifsd_sess *sess, uint64_t fid, uint64_t p_id,
char *buf, size_t count, loff_t *pos, bool sync, ssize_t *written)
{
struct file *filp;
loff_t offset = *pos;
mm_segment_t old_fs;
struct cifsd_file *fp;
int err;
fp = get_id_from_fidtable(sess, fid);
if (!fp) {
cifsd_err("failed to get filp for fid %llu session = 0x%p\n",
fid, sess);
return -ENOENT;
}
#ifdef CONFIG_CIFS_SMB2_SERVER
if (fp->is_durable && fp->persistent_id != p_id) {
cifsd_err("persistent id mismatch : %llu, %llu\n",
fp->persistent_id, p_id);
return -ENOENT;
}
if (sess->conn->connection_type) {
if (!(fp->daccess & (FILE_WRITE_DATA_LE |
FILE_GENERIC_WRITE_LE | FILE_MAXIMAL_ACCESS_LE |
FILE_GENERIC_ALL_LE))) {
cifsd_err("no right to write(%llu)\n", fid);
return -EACCES;
}
}
#endif
filp = fp->filp;
if (fp->is_stream) {
char *stream_buf = NULL, *wbuf;
size_t size, v_len;
cifsd_debug("write stream data pos : %llu, count : %zd\n",
*pos, count);
size = *pos + count;
if (size > XATTR_SIZE_MAX) {
size = XATTR_SIZE_MAX;
count = (*pos + count) - XATTR_SIZE_MAX;
}
v_len = smb_find_cont_xattr(&filp->f_path, fp->stream.name,
fp->stream.size, &stream_buf, 1);
if (v_len == -ENOENT) {
cifsd_err("not found stream in xattr : %zd\n", v_len);
kvfree(stream_buf);
return -ENOENT;
}
if (v_len < size) {
wbuf = alloc_data_mem(size);
if (!wbuf) {
kvfree(stream_buf);
return -ENOMEM;
}
if (v_len > 0) {
memcpy(wbuf, stream_buf, v_len);
kvfree(stream_buf);
}
stream_buf = wbuf;
}
memcpy(&stream_buf[*pos], buf, count);
err = smb_store_cont_xattr(&filp->f_path, fp->stream.name,
(void *)stream_buf, size);
if (err < 0)
return err;
kvfree(stream_buf);
filp->f_pos = *pos;
*written = count;
return 0;
}
err = check_lock_range(filp, *pos, *pos + count - 1,
WRITE);
if (err) {
cifsd_err("%s: unable to write due to lock\n",
__func__);
return -EAGAIN;
}
old_fs = get_fs();
set_fs(KERNEL_DS);
if (oplocks_enable) {
/* Do we need to break any of a levelII oplock? */
mutex_lock(&ofile_list_lock);
smb_breakII_oplock(sess->conn, fp, NULL);
mutex_unlock(&ofile_list_lock);
}
err = vfs_write(filp, buf, count, pos);
set_fs(old_fs);
if (err < 0) {
cifsd_debug("smb write failed, err = %d\n", err);
return err;
}
filp->f_pos = *pos;
*written = err;
err = 0;
if (sync) {
err = vfs_fsync_range(filp, offset, offset + *written, 0);
if (err < 0)
cifsd_err("fsync failed for fid %llu, err = %d\n",
fid, err);
}
return err;
}
/**
* smb_check_attrs() - sanitize inode attributes
* @inode: inode
* @attrs: inode attributes
*/
void smb_check_attrs(struct inode *inode, struct iattr *attrs)
{
/* sanitize the mode change */
if (attrs->ia_valid & ATTR_MODE) {
attrs->ia_mode &= S_IALLUGO;
attrs->ia_mode |= (inode->i_mode & ~S_IALLUGO);
}
/* Revoke setuid/setgid on chown */
if (!S_ISDIR(inode->i_mode) &&
(((attrs->ia_valid & ATTR_UID) &&
!uid_eq(attrs->ia_uid, inode->i_uid)) ||
((attrs->ia_valid & ATTR_GID) &&
!gid_eq(attrs->ia_gid, inode->i_gid)))) {
attrs->ia_valid |= ATTR_KILL_PRIV;
if (attrs->ia_valid & ATTR_MODE) {
/* we're setting mode too, just clear the s*id bits */
attrs->ia_mode &= ~S_ISUID;
if (attrs->ia_mode & S_IXGRP)
attrs->ia_mode &= ~S_ISGID;
} else {
/* set ATTR_KILL_* bits and let VFS handle it */
attrs->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
}
}
}
/**
* smb_vfs_setattr() - vfs helper for smb setattr
* @sess: session
* @name: file name
* @fid: file id of open file
* @attrs: inode attributes
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_setattr(struct cifsd_sess *sess, const char *name,
uint64_t fid, struct iattr *attrs)
{
struct file *filp;
struct dentry *dentry;
struct inode *inode;
struct path path;
bool update_size = false;
int err = 0;
struct cifsd_file *fp;
if (name) {
err = kern_path(name, 0, &path);
if (err) {
cifsd_debug("lookup failed for %s, err = %d\n",
name, err);
return -ENOENT;
}
dentry = path.dentry;
inode = dentry->d_inode;
} else {
fp = get_id_from_fidtable(sess, fid);
if (!fp) {
cifsd_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
filp = fp->filp;
dentry = filp->f_path.dentry;
inode = dentry->d_inode;
}
/* no need to update mode of symlink */
if (S_ISLNK(inode->i_mode))
attrs->ia_valid &= ~ATTR_MODE;
/* skip setattr, if nothing to update */
if (!attrs->ia_valid) {
err = 0;
goto out;
}
smb_check_attrs(inode, attrs);
if (attrs->ia_valid & ATTR_SIZE) {
err = get_write_access(inode);
if (err)
goto out;
err = locks_verify_truncate(inode, NULL, attrs->ia_size);
if (err) {
put_write_access(inode);
goto out;
}
update_size = true;
}
attrs->ia_valid |= ATTR_CTIME;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
inode_lock(inode);
err = notify_change(dentry, attrs, NULL);
inode_unlock(inode);
#else
mutex_lock(&inode->i_mutex);
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 13, 0)
err = notify_change(dentry, attrs, NULL);
#else
err = notify_change(dentry, attrs);
#endif
mutex_unlock(&inode->i_mutex);
#endif
if (update_size)
put_write_access(inode);
if (!err) {
sync_inode_metadata(inode, 1);
cifsd_debug("fid %llu, setattr done\n", fid);
}
out:
if (name)
path_put(&path);
return err;
}
/**
* smb_vfs_getattr() - vfs helper for smb getattr
* @sess: session
* @fid: file id of open file
* @attrs: inode attributes
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_getattr(struct cifsd_sess *sess, uint64_t fid,
struct kstat *stat)
{
struct file *filp;
struct cifsd_file *fp;
int err;
fp = get_id_from_fidtable(sess, fid);
if (!fp) {
cifsd_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
filp = fp->filp;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
err = vfs_getattr(&filp->f_path, stat, STATX_BASIC_STATS,
AT_STATX_SYNC_AS_STAT);
#else
err = vfs_getattr(&filp->f_path, stat);
#endif
if (err)
cifsd_err("getattr failed for fid %llu, err %d\n", fid, err);
return err;
}
/**
* smb_vfs_fsync() - vfs helper for smb fsync
* @sess: session
* @fid: file id of open file
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_fsync(struct cifsd_sess *sess, uint64_t fid, uint64_t p_id)
{
struct cifsd_file *fp;
int err;
fp = get_id_from_fidtable(sess, fid);
if (!fp) {
cifsd_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
if (fp->is_durable && fp->persistent_id != p_id) {
cifsd_err("persistent id mismatch : %llu, %llu\n",
fp->persistent_id, p_id);
return -ENOENT;
}
err = vfs_fsync(fp->filp, 0);
if (err < 0)
cifsd_err("smb fsync failed, err = %d\n", err);
return err;
}
/**
* smb_vfs_remove_file() - vfs helper for smb rmdir or unlink
* @name: absolute directory or file name
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_remove_file(char *name)
{
struct path parent;
struct dentry *dir, *dentry;
char *last;
int err = -ENOENT;
last = strrchr(name, '/');
if (last && last[1] != '\0') {
*last = '\0';
last++;
}
else {
cifsd_debug("can't get last component in path %s\n", name);
return -ENOENT;
}
err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &parent);
if (err) {
cifsd_debug("can't get %s, err %d\n", name, err);
return err;
}
dir = parent.dentry;
if (!dir->d_inode)
goto out;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
inode_lock_nested(dir->d_inode, I_MUTEX_PARENT);
#else
mutex_lock_nested(&dir->d_inode->i_mutex, I_MUTEX_PARENT);
#endif
dentry = lookup_one_len(last, dir, strlen(last));
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
cifsd_debug("%s: lookup failed, err %d\n", last, err);
goto out_err;
}
if (!dentry->d_inode || !dentry->d_inode->i_nlink) {
dput(dentry);
err = -ENOENT;
goto out_err;
}
if (S_ISDIR(dentry->d_inode->i_mode)) {
err = vfs_rmdir(dir->d_inode, dentry);
if (err && err != -ENOTEMPTY)
cifsd_debug("%s: rmdir failed, err %d\n", name, err);
} else {
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 10, 30)
err = vfs_unlink(dir->d_inode, dentry, NULL);
#else
err = vfs_unlink(dir->d_inode, dentry);
#endif
if (err)
cifsd_debug("%s: unlink failed, err %d\n", name, err);
}
dput(dentry);
out_err:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)
inode_unlock(dir->d_inode);
#else
mutex_unlock(&dir->d_inode->i_mutex);
#endif
out:
path_put(&parent);
return err;
}
/**
* smb_vfs_link() - vfs helper for creating smb hardlink
* @oldname: source file name
* @newname: hardlink name
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_link(const char *oldname, const char *newname)
{
struct path oldpath, newpath;
struct dentry *dentry;
int err;
err = kern_path(oldname, LOOKUP_FOLLOW, &oldpath);
if (err) {
cifsd_err("cannot get linux path for %s, err = %d\n",
oldname, err);
goto out1;
}
dentry = kern_path_create(AT_FDCWD, newname, &newpath,
LOOKUP_FOLLOW & LOOKUP_REVAL);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
cifsd_err("path create err for %s, err %d\n", newname, err);
goto out2;
}
err = -EXDEV;
if (oldpath.mnt != newpath.mnt) {
cifsd_err("vfs_link failed err %d\n", err);
goto out3;
}
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 10, 30)
err = vfs_link(oldpath.dentry, newpath.dentry->d_inode, dentry, NULL);
#else
err = vfs_link(oldpath.dentry, newpath.dentry->d_inode, dentry);
#endif
if (err)
cifsd_debug("vfs_link failed err %d\n", err);
out3:
done_path_create(&newpath, dentry);
out2:
path_put(&oldpath);
out1:
return err;
}
/**
* smb_vfs_symlink() - vfs helper for creating smb symlink
* @name: source file name
* @symname: symlink name
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_symlink(const char *name, const char *symname)
{
struct path path;
struct dentry *dentry;
int err;
dentry = kern_path_create(AT_FDCWD, symname, &path, 0);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
cifsd_err("path create failed for %s, err %d\n", name, err);
return err;
}
err = vfs_symlink(dentry->d_parent->d_inode, dentry, name);
if (err && (err != -EEXIST || err != -ENOSPC))
cifsd_debug("failed to create symlink, err %d\n", err);
done_path_create(&path, dentry);
return err;
}
/**
* smb_vfs_readlink() - vfs helper for reading value of symlink
* @path: path of symlink
* @buf: destination buffer for symlink value
* @lenp: destination buffer length
*
* Return: symlink value length on success, otherwise error
*/
int smb_vfs_readlink(struct path *path, char *buf, int lenp)
{
struct inode *inode;
mm_segment_t old_fs;
int err;
if (!path)
return -ENOENT;
inode = path->dentry->d_inode;
if (!S_ISLNK(inode->i_mode))
return -EINVAL;
old_fs = get_fs();
set_fs(KERNEL_DS);
err = inode->i_op->readlink(path->dentry, (char __user *)buf, lenp);
set_fs(old_fs);
if (err < 0)
cifsd_err("readlink failed, err = %d\n", err);
return err;
}
/**
* smb_vfs_rename() - vfs helper for smb rename
* @sess: session
* @abs_oldname: old filename
* @abs_newname: new filename
* @oldfid: file id of old file
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_rename(struct cifsd_sess *sess, char *abs_oldname,
char *abs_newname, uint64_t oldfid)
{
struct path oldpath_p, newpath_p;
struct dentry *dold, *dnew, *dold_p, *dnew_p, *trap, *child_de;
char *oldname = NULL, *newname = NULL;
struct file *filp = NULL;
struct cifsd_file *fp = NULL;
int err;
if (abs_oldname) {
/* normal case: rename with source filename */
oldname = strrchr(abs_oldname, '/');
if (oldname && oldname[1] != '\0') {
*oldname = '\0';
oldname++;
}
else {
cifsd_err("can't get last component in path %s\n",
abs_oldname);
return -ENOENT;
}
err = kern_path(abs_oldname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
&oldpath_p);
if (err) {
cifsd_err("cannot get linux path for %s, err %d\n",
abs_oldname, err);
return -ENOENT;
}
dold_p = oldpath_p.dentry;
newname = strrchr(abs_newname, '/');
if (newname && newname[1] != '\0') {
*newname = '\0';
newname++;
}
else {
cifsd_err("can't get last component in path %s\n",
abs_newname);
err = -ENOMEM;
goto out1;
}
err = kern_path(abs_newname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
&newpath_p);
if (err) {
cifsd_err("cannot get linux path for %s, err = %d\n",
abs_newname, err);
goto out1;
}
dnew_p = newpath_p.dentry;
} else {
/* rename by fid of source file instead of source filename */
fp = get_id_from_fidtable(sess, oldfid);
if (!fp) {
cifsd_err("can't find filp for fid %llu\n", oldfid);
return -ENOENT;
}
filp = fp->filp;
dold_p = filp->f_path.dentry->d_parent;
newname = strrchr(abs_newname, '/');
if (newname && newname[1] != '\0') {
*newname = '\0';
newname++;
}
else {
cifsd_err("can't get last component in path %s\n",
abs_newname);
return -ENOMEM;
}
err = kern_path(abs_newname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY,
&newpath_p);
if (err) {
cifsd_err("cannot get linux path for %s, err = %d\n",
abs_newname, err);
return err;
}
dnew_p = newpath_p.dentry;
}
cifsd_debug("oldname %s, newname %s\n", oldname, newname);
trap = lock_rename(dold_p, dnew_p);
if (abs_oldname) {
dold = lookup_one_len(oldname, dold_p, strlen(oldname));
err = PTR_ERR(dold);
if (IS_ERR(dold)) {
cifsd_err("%s lookup failed with error = %d\n",
oldname, err);
goto out2;
}
} else {
dold = filp->f_path.dentry;
dget(dold);
}
spin_lock(&dold->d_lock);
list_for_each_entry(child_de, &dold->d_subdirs, d_child) {
struct cifsd_file *child_fp;
if (!child_de->d_inode)
continue;
child_fp = find_fp_using_inode(child_de->d_inode);
if (child_fp) {
cifsd_debug("not allow to rename dir with opening sub file\n");
err = -ENOTEMPTY;
spin_unlock(&dold->d_lock);
goto out3;
}
}
spin_unlock(&dold->d_lock);
err = -ENOENT;
if (!dold->d_inode)
goto out3;
err = -EINVAL;
if (dold == trap)
goto out3;
dnew = lookup_one_len(newname, dnew_p, strlen(newname));
err = PTR_ERR(dnew);
if (IS_ERR(dnew)) {
cifsd_err("%s lookup failed with error = %d\n",
newname, err);
goto out3;
}
err = -ENOTEMPTY;
if (dnew == trap)
goto out4;
#if LINUX_VERSION_CODE > KERNEL_VERSION(3, 10, 30)
err = vfs_rename(dold_p->d_inode, dold, dnew_p->d_inode, dnew, NULL, 0);
#else
err = vfs_rename(dold_p->d_inode, dold, dnew_p->d_inode, dnew);
#endif
if (err)
cifsd_err("vfs_rename failed err %d\n", err);
out4:
dput(dnew);
out3:
dput(dold);
out2:
unlock_rename(dold_p, dnew_p);
path_put(&newpath_p);
out1:
if (abs_oldname)
path_put(&oldpath_p);
return err;
}
/**
* smb_vfs_truncate() - vfs helper for smb file truncate
* @sess: session
* @name: old filename
* @fid: file id of old file
* @size: truncate to given size
*
* Return: 0 on success, otherwise error
*/
int smb_vfs_truncate(struct cifsd_sess *sess, const char *name,
uint64_t fid, loff_t size)
{
struct path path;
struct file *filp;
int err = 0;
struct cifsd_file *fp;
struct inode *inode;
if (name) {
err = kern_path(name, 0, &path);
if (err) {
cifsd_err("cannot get linux path for %s, err %d\n",
name, err);
return err;
}
err = vfs_truncate(&path, size);
if (err)
cifsd_err("truncate failed for %s err %d\n",
name, err);
path_put(&path);
} else {
fp = get_id_from_fidtable(sess, fid);
if (!fp) {
cifsd_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
filp = fp->filp;
if (oplocks_enable) {
/* Do we need to break any of a levelII oplock? */
mutex_lock(&ofile_list_lock);
smb_breakII_oplock(sess->conn, fp, NULL);
mutex_unlock(&ofile_list_lock);
} else {
inode = file_inode(filp);
if (size < inode->i_size) {
err = check_lock_range(filp, size,
inode->i_size - 1, WRITE);
} else {
err = check_lock_range(filp, inode->i_size,
size - 1, WRITE);
}
if (err) {
cifsd_err("failed due to lock\n");
return -EAGAIN;
}
}
err = vfs_truncate(&filp->f_path, size);
if (err)
cifsd_err("truncate failed for fid %llu err %d\n",
fid, err);
}
return err;
}
/**
* smb_vfs_listxattr() - vfs helper for smb list extended attributes
* @dentry: dentry of file for listing xattrs
* @list: destination buffer
* @size: destination buffer length
*
* Return: xattr list length on success, otherwise error
*/
ssize_t smb_vfs_listxattr(struct dentry *dentry, char **list, int size)
{
ssize_t err;
char *vlist = NULL;
if (size) {
if (size > XATTR_LIST_MAX)
size = XATTR_LIST_MAX;
vlist = vmalloc(size);
if (!vlist)
return -ENOMEM;
}
*list = vlist;
err = vfs_listxattr(dentry, vlist, size);
if (err == -ERANGE) {
/* The file system tried to returned a list bigger
than XATTR_LIST_MAX bytes. Not possible. */
err = -E2BIG;
cifsd_debug("listxattr failed\n");
}
return err;
}
/**
* smb_vfs_getxattr() - vfs helper for smb get extended attributes value
* @dentry: dentry of file for getting xattrs
* @xattr_name: name of xattr name to query
* @xattr_buf: destination buffer xattr value
*
* Return: read xattr value length on success, otherwise error
*/
ssize_t smb_vfs_getxattr(struct dentry *dentry, char *xattr_name,
char **xattr_buf, int flags)
{
ssize_t xattr_len;
char *buf;
xattr_len = vfs_getxattr(dentry, xattr_name, NULL, 0);