// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <[email protected]>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/filelock.h>
#include <linux/uaccess.h>
#include <linux/backing-dev.h>
#include <linux/writeback.h>
#include <linux/xattr.h>
#include <linux/falloc.h>
#include <linux/fsnotify.h>
#include <linux/dcache.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/sched/xacct.h>
#include <linux/crc32c.h>
#include <linux/namei.h>
#include "glob.h"
#include "oplock.h"
#include "connection.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "smbacl.h"
#include "ndr.h"
#include "auth.h"
#include "misc.h"
#include "smb_common.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/user_config.h"
static void ksmbd_vfs_inherit_owner(struct ksmbd_work *work,
struct inode *parent_inode,
struct inode *inode)
{
if (!test_share_config_flag(work->tcon->share_conf,
KSMBD_SHARE_FLAG_INHERIT_OWNER))
return;
i_uid_write(inode, i_uid_read(parent_inode));
}
/**
* ksmbd_vfs_lock_parent() - lock parent dentry if it is stable
* @parent: parent dentry
* @child: child dentry
*
* Returns: %0 on success, %-ENOENT if the parent dentry is not stable
*/
int ksmbd_vfs_lock_parent(struct dentry *parent, struct dentry *child)
{
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
if (child->d_parent != parent) {
inode_unlock(d_inode(parent));
return -ENOENT;
}
return 0;
}
static int ksmbd_vfs_path_lookup_locked(struct ksmbd_share_config *share_conf,
char *pathname, unsigned int flags,
struct path *parent_path,
struct path *path)
{
struct qstr last;
struct filename *filename;
struct path *root_share_path = &share_conf->vfs_path;
int err, type;
struct dentry *d;
if (pathname[0] == '\0') {
pathname = share_conf->path;
root_share_path = NULL;
} else {
flags |= LOOKUP_BENEATH;
}
filename = getname_kernel(pathname);
if (IS_ERR(filename))
return PTR_ERR(filename);
err = vfs_path_parent_lookup(filename, flags,
parent_path, &last, &type,
root_share_path);
if (err) {
putname(filename);
return err;
}
if (unlikely(type != LAST_NORM)) {
path_put(parent_path);
putname(filename);
return -ENOENT;
}
err = mnt_want_write(parent_path->mnt);
if (err) {
path_put(parent_path);
putname(filename);
return -ENOENT;
}
inode_lock_nested(parent_path->dentry->d_inode, I_MUTEX_PARENT);
d = lookup_one_qstr_excl(&last, parent_path->dentry, 0);
if (IS_ERR(d))
goto err_out;
if (d_is_negative(d)) {
dput(d);
goto err_out;
}
path->dentry = d;
path->mnt = mntget(parent_path->mnt);
if (test_share_config_flag(share_conf, KSMBD_SHARE_FLAG_CROSSMNT)) {
err = follow_down(path, 0);
if (err < 0) {
path_put(path);
goto err_out;
}
}
putname(filename);
return 0;
err_out:
inode_unlock(d_inode(parent_path->dentry));
mnt_drop_write(parent_path->mnt);
path_put(parent_path);
putname(filename);
return -ENOENT;
}
void ksmbd_vfs_query_maximal_access(struct mnt_idmap *idmap,
struct dentry *dentry, __le32 *daccess)
{
*daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL);
if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_WRITE))
*daccess |= cpu_to_le32(WRITE_DAC | WRITE_OWNER | SYNCHRONIZE |
FILE_WRITE_DATA | FILE_APPEND_DATA |
FILE_WRITE_EA | FILE_WRITE_ATTRIBUTES |
FILE_DELETE_CHILD);
if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_READ))
*daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE;
if (!inode_permission(idmap, d_inode(dentry), MAY_OPEN | MAY_EXEC))
*daccess |= FILE_EXECUTE_LE;
if (!inode_permission(idmap, d_inode(dentry->d_parent), MAY_EXEC | MAY_WRITE))
*daccess |= FILE_DELETE_LE;
}
/**
* ksmbd_vfs_create() - vfs helper for smb create file
* @work: work
* @name: file name that is relative to share
* @mode: file create mode
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode)
{
struct path path;
struct dentry *dentry;
int err;
dentry = ksmbd_vfs_kern_path_create(work, name,
LOOKUP_NO_SYMLINKS, &path);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
if (err != -ENOENT)
pr_err("path create failed for %s, err %d\n",
name, err);
return err;
}
mode |= S_IFREG;
err = vfs_create(mnt_idmap(path.mnt), d_inode(path.dentry),
dentry, mode, true);
if (!err) {
ksmbd_vfs_inherit_owner(work, d_inode(path.dentry),
d_inode(dentry));
} else {
pr_err("File(%s): creation failed (err:%d)\n", name, err);
}
done_path_create(&path, dentry);
return err;
}
/**
* ksmbd_vfs_mkdir() - vfs helper for smb create directory
* @work: work
* @name: directory name that is relative to share
* @mode: directory create mode
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode)
{
struct mnt_idmap *idmap;
struct path path;
struct dentry *dentry;
int err;
dentry = ksmbd_vfs_kern_path_create(work, name,
LOOKUP_NO_SYMLINKS | LOOKUP_DIRECTORY,
&path);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
if (err != -EEXIST)
ksmbd_debug(VFS, "path create failed for %s, err %d\n",
name, err);
return err;
}
idmap = mnt_idmap(path.mnt);
mode |= S_IFDIR;
err = vfs_mkdir(idmap, d_inode(path.dentry), dentry, mode);
if (!err && d_unhashed(dentry)) {
struct dentry *d;
d = lookup_one(idmap, dentry->d_name.name, dentry->d_parent,
dentry->d_name.len);
if (IS_ERR(d)) {
err = PTR_ERR(d);
goto out_err;
}
if (unlikely(d_is_negative(d))) {
dput(d);
err = -ENOENT;
goto out_err;
}
ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), d_inode(d));
dput(d);
}
out_err:
done_path_create(&path, dentry);
if (err)
pr_err("mkdir(%s): creation failed (err:%d)\n", name, err);
return err;
}
static ssize_t ksmbd_vfs_getcasexattr(struct mnt_idmap *idmap,
struct dentry *dentry, char *attr_name,
int attr_name_len, char **attr_value)
{
char *name, *xattr_list = NULL;
ssize_t value_len = -ENOENT, xattr_list_len;
xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
if (xattr_list_len <= 0)
goto out;
for (name = xattr_list; name - xattr_list < xattr_list_len;
name += strlen(name) + 1) {
ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
if (strncasecmp(attr_name, name, attr_name_len))
continue;
value_len = ksmbd_vfs_getxattr(idmap,
dentry,
name,
attr_value);
if (value_len < 0)
pr_err("failed to get xattr in file\n");
break;
}
out:
kvfree(xattr_list);
return value_len;
}
static int ksmbd_vfs_stream_read(struct ksmbd_file *fp, char *buf, loff_t *pos,
size_t count)
{
ssize_t v_len;
char *stream_buf = NULL;
ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n",
*pos, count);
v_len = ksmbd_vfs_getcasexattr(file_mnt_idmap(fp->filp),
fp->filp->f_path.dentry,
fp->stream.name,
fp->stream.size,
&stream_buf);
if ((int)v_len <= 0)
return (int)v_len;
if (v_len <= *pos) {
count = -EINVAL;
goto free_buf;
}
if (v_len - *pos < count)
count = v_len - *pos;
memcpy(buf, &stream_buf[*pos], count);
free_buf:
kvfree(stream_buf);
return count;
}
/**
* check_lock_range() - vfs helper for smb byte range file locking
* @filp: the file to apply the lock to
* @start: lock start byte offset
* @end: lock end byte offset
* @type: byte range type read/write
*
* Return: 0 on success, otherwise error
*/
static int check_lock_range(struct file *filp, loff_t start, loff_t end,
unsigned char type)
{
struct file_lock *flock;
struct file_lock_context *ctx = locks_inode_context(file_inode(filp));
int error = 0;
if (!ctx || list_empty_careful(&ctx->flc_posix))
return 0;
spin_lock(&ctx->flc_lock);
for_each_file_lock(flock, &ctx->flc_posix) {
/* check conflict locks */
if (flock->fl_end >= start && end >= flock->fl_start) {
if (lock_is_read(flock)) {
if (type == WRITE) {
pr_err("not allow write by shared lock\n");
error = 1;
goto out;
}
} else if (lock_is_write(flock)) {
/* check owner in lock */
if (flock->c.flc_file != filp) {
error = 1;
pr_err("not allow rw access by exclusive lock from other opens\n");
goto out;
}
}
}
}
out:
spin_unlock(&ctx->flc_lock);
return error;
}
/**
* ksmbd_vfs_read() - vfs helper for smb file read
* @work: smb work
* @fp: ksmbd file pointer
* @count: read byte count
* @pos: file pos
* @rbuf: read data buffer
*
* Return: number of read bytes on success, otherwise error
*/
int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, size_t count,
loff_t *pos, char *rbuf)
{
struct file *filp = fp->filp;
ssize_t nbytes = 0;
struct inode *inode = file_inode(filp);
if (S_ISDIR(inode->i_mode))
return -EISDIR;
if (unlikely(count == 0))
return 0;
if (work->conn->connection_type) {
if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
pr_err("no right to read(%pD)\n", fp->filp);
return -EACCES;
}
}
if (ksmbd_stream_fd(fp))
return ksmbd_vfs_stream_read(fp, rbuf, pos, count);
if (!work->tcon->posix_extensions) {
int ret;
ret = check_lock_range(filp, *pos, *pos + count - 1, READ);
if (ret) {
pr_err("unable to read due to lock\n");
return -EAGAIN;
}
}
nbytes = kernel_read(filp, rbuf, count, pos);
if (nbytes < 0) {
pr_err("smb read failed, err = %zd\n", nbytes);
return nbytes;
}
filp->f_pos = *pos;
return nbytes;
}
static int ksmbd_vfs_stream_write(struct ksmbd_file *fp, char *buf, loff_t *pos,
size_t count)
{
char *stream_buf = NULL, *wbuf;
struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
size_t size;
ssize_t v_len;
int err = 0;
ksmbd_debug(VFS, "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 = ksmbd_vfs_getcasexattr(idmap,
fp->filp->f_path.dentry,
fp->stream.name,
fp->stream.size,
&stream_buf);
if (v_len < 0) {
pr_err("not found stream in xattr : %zd\n", v_len);
err = v_len;
goto out;
}
if (v_len < size) {
wbuf = kvzalloc(size, GFP_KERNEL);
if (!wbuf) {
err = -ENOMEM;
goto out;
}
if (v_len > 0)
memcpy(wbuf, stream_buf, v_len);
kvfree(stream_buf);
stream_buf = wbuf;
}
memcpy(&stream_buf[*pos], buf, count);
err = ksmbd_vfs_setxattr(idmap,
&fp->filp->f_path,
fp->stream.name,
(void *)stream_buf,
size,
0,
true);
if (err < 0)
goto out;
fp->filp->f_pos = *pos;
err = 0;
out:
kvfree(stream_buf);
return err;
}
/**
* ksmbd_vfs_write() - vfs helper for smb file write
* @work: work
* @fp: ksmbd file pointer
* @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 ksmbd_vfs_write(struct ksmbd_work *work, struct ksmbd_file *fp,
char *buf, size_t count, loff_t *pos, bool sync,
ssize_t *written)
{
struct file *filp;
loff_t offset = *pos;
int err = 0;
if (work->conn->connection_type) {
if (!(fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
pr_err("no right to write(%pD)\n", fp->filp);
err = -EACCES;
goto out;
}
}
filp = fp->filp;
if (ksmbd_stream_fd(fp)) {
err = ksmbd_vfs_stream_write(fp, buf, pos, count);
if (!err)
*written = count;
goto out;
}
if (!work->tcon->posix_extensions) {
err = check_lock_range(filp, *pos, *pos + count - 1, WRITE);
if (err) {
pr_err("unable to write due to lock\n");
err = -EAGAIN;
goto out;
}
}
/* Reserve lease break for parent dir at closing time */
fp->reserve_lease_break = true;
/* Do we need to break any of a levelII oplock? */
smb_break_all_levII_oplock(work, fp, 1);
err = kernel_write(filp, buf, count, pos);
if (err < 0) {
ksmbd_debug(VFS, "smb write failed, err = %d\n", err);
goto out;
}
filp->f_pos = *pos;
*written = err;
err = 0;
if (sync) {
err = vfs_fsync_range(filp, offset, offset + *written, 0);
if (err < 0)
pr_err("fsync failed for filename = %pD, err = %d\n",
fp->filp, err);
}
out:
return err;
}
/**
* ksmbd_vfs_getattr() - vfs helper for smb getattr
* @path: path of dentry
* @stat: pointer to returned kernel stat structure
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_getattr(const struct path *path, struct kstat *stat)
{
int err;
err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT);
if (err)
pr_err("getattr failed, err %d\n", err);
return err;
}
/**
* ksmbd_vfs_fsync() - vfs helper for smb fsync
* @work: work
* @fid: file id of open file
* @p_id: persistent file id
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_fsync(struct ksmbd_work *work, u64 fid, u64 p_id)
{
struct ksmbd_file *fp;
int err;
fp = ksmbd_lookup_fd_slow(work, fid, p_id);
if (!fp) {
pr_err("failed to get filp for fid %llu\n", fid);
return -ENOENT;
}
err = vfs_fsync(fp->filp, 0);
if (err < 0)
pr_err("smb fsync failed, err = %d\n", err);
ksmbd_fd_put(work, fp);
return err;
}
/**
* ksmbd_vfs_remove_file() - vfs helper for smb rmdir or unlink
* @work: work
* @path: path of dentry
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_remove_file(struct ksmbd_work *work, const struct path *path)
{
struct mnt_idmap *idmap;
struct dentry *parent = path->dentry->d_parent;
int err;
if (ksmbd_override_fsids(work))
return -ENOMEM;
if (!d_inode(path->dentry)->i_nlink) {
err = -ENOENT;
goto out_err;
}
idmap = mnt_idmap(path->mnt);
if (S_ISDIR(d_inode(path->dentry)->i_mode)) {
err = vfs_rmdir(idmap, d_inode(parent), path->dentry);
if (err && err != -ENOTEMPTY)
ksmbd_debug(VFS, "rmdir failed, err %d\n", err);
} else {
err = vfs_unlink(idmap, d_inode(parent), path->dentry, NULL);
if (err)
ksmbd_debug(VFS, "unlink failed, err %d\n", err);
}
out_err:
ksmbd_revert_fsids(work);
return err;
}
/**
* ksmbd_vfs_link() - vfs helper for creating smb hardlink
* @work: work
* @oldname: source file name
* @newname: hardlink name that is relative to share
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_link(struct ksmbd_work *work, const char *oldname,
const char *newname)
{
struct path oldpath, newpath;
struct dentry *dentry;
int err;
if (ksmbd_override_fsids(work))
return -ENOMEM;
err = kern_path(oldname, LOOKUP_NO_SYMLINKS, &oldpath);
if (err) {
pr_err("cannot get linux path for %s, err = %d\n",
oldname, err);
goto out1;
}
dentry = ksmbd_vfs_kern_path_create(work, newname,
LOOKUP_NO_SYMLINKS | LOOKUP_REVAL,
&newpath);
if (IS_ERR(dentry)) {
err = PTR_ERR(dentry);
pr_err("path create err for %s, err %d\n", newname, err);
goto out2;
}
err = -EXDEV;
if (oldpath.mnt != newpath.mnt) {
pr_err("vfs_link failed err %d\n", err);
goto out3;
}
err = vfs_link(oldpath.dentry, mnt_idmap(newpath.mnt),
d_inode(newpath.dentry),
dentry, NULL);
if (err)
ksmbd_debug(VFS, "vfs_link failed err %d\n", err);
out3:
done_path_create(&newpath, dentry);
out2:
path_put(&oldpath);
out1:
ksmbd_revert_fsids(work);
return err;
}
int ksmbd_vfs_rename(struct ksmbd_work *work, const struct path *old_path,
char *newname, int flags)
{
struct dentry *old_parent, *new_dentry, *trap;
struct dentry *old_child = old_path->dentry;
struct path new_path;
struct qstr new_last;
struct renamedata rd;
struct filename *to;
struct ksmbd_share_config *share_conf = work->tcon->share_conf;
struct ksmbd_file *parent_fp;
int new_type;
int err, lookup_flags = LOOKUP_NO_SYMLINKS;
if (ksmbd_override_fsids(work))
return -ENOMEM;
to = getname_kernel(newname);
if (IS_ERR(to)) {
err = PTR_ERR(to);
goto revert_fsids;
}
retry:
err = vfs_path_parent_lookup(to, lookup_flags | LOOKUP_BENEATH,
&new_path, &new_last, &new_type,
&share_conf->vfs_path);
if (err)
goto out1;
if (old_path->mnt != new_path.mnt) {
err = -EXDEV;
goto out2;
}
err = mnt_want_write(old_path->mnt);
if (err)
goto out2;
trap = lock_rename_child(old_child, new_path.dentry);
if (IS_ERR(trap)) {
err = PTR_ERR(trap);
goto out_drop_write;
}
old_parent = dget(old_child->d_parent);
if (d_unhashed(old_child)) {
err = -EINVAL;
goto out3;
}
parent_fp = ksmbd_lookup_fd_inode(old_child->d_parent);
if (parent_fp) {
if (parent_fp->daccess & FILE_DELETE_LE) {
pr_err("parent dir is opened with delete access\n");
err = -ESHARE;
ksmbd_fd_put(work, parent_fp);
goto out3;
}
ksmbd_fd_put(work, parent_fp);
}
new_dentry = lookup_one_qstr_excl(&new_last, new_path.dentry,
lookup_flags | LOOKUP_RENAME_TARGET);
if (IS_ERR(new_dentry)) {
err = PTR_ERR(new_dentry);
goto out3;
}
if (d_is_symlink(new_dentry)) {
err = -EACCES;
goto out4;
}
/*
* explicitly handle file overwrite case, for compatibility with
* filesystems that may not support rename flags (e.g: fuse)
*/
if ((flags & RENAME_NOREPLACE) && d_is_positive(new_dentry)) {
err = -EEXIST;
goto out4;
}
flags &= ~(RENAME_NOREPLACE);
if (old_child == trap) {
err = -EINVAL;
goto out4;
}
if (new_dentry == trap) {
err = -ENOTEMPTY;
goto out4;
}
rd.old_mnt_idmap = mnt_idmap(old_path->mnt),
rd.old_dir = d_inode(old_parent),
rd.old_dentry = old_child,
rd.new_mnt_idmap = mnt_idmap(new_path.mnt),
rd.new_dir = new_path.dentry->d_inode,
rd.new_dentry = new_dentry,
rd.flags = flags,
rd.delegated_inode = NULL,
err = vfs_rename(&rd);
if (err)
ksmbd_debug(VFS, "vfs_rename failed err %d\n", err);
out4:
dput(new_dentry);
out3:
dput(old_parent);
unlock_rename(old_parent, new_path.dentry);
out_drop_write:
mnt_drop_write(old_path->mnt);
out2:
path_put(&new_path);
if (retry_estale(err, lookup_flags)) {
lookup_flags |= LOOKUP_REVAL;
goto retry;
}
out1:
putname(to);
revert_fsids:
ksmbd_revert_fsids(work);
return err;
}
/**
* ksmbd_vfs_truncate() - vfs helper for smb file truncate
* @work: work
* @fp: ksmbd file pointer
* @size: truncate to given size
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_truncate(struct ksmbd_work *work,
struct ksmbd_file *fp, loff_t size)
{
int err = 0;
struct file *filp;
filp = fp->filp;
/* Do we need to break any of a levelII oplock? */
smb_break_all_levII_oplock(work, fp, 1);
if (!work->tcon->posix_extensions) {
struct inode *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) {
pr_err("failed due to lock\n");
return -EAGAIN;
}
}
err = vfs_truncate(&filp->f_path, size);
if (err)
pr_err("truncate failed, err %d\n", err);
return err;
}
/**
* ksmbd_vfs_listxattr() - vfs helper for smb list extended attributes
* @dentry: dentry of file for listing xattrs
* @list: destination buffer
*
* Return: xattr list length on success, otherwise error
*/
ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list)
{
ssize_t size;
char *vlist = NULL;
size = vfs_listxattr(dentry, NULL, 0);
if (size <= 0)
return size;
vlist = kvzalloc(size, GFP_KERNEL);
if (!vlist)
return -ENOMEM;
*list = vlist;
size = vfs_listxattr(dentry, vlist, size);
if (size < 0) {
ksmbd_debug(VFS, "listxattr failed\n");
kvfree(vlist);
*list = NULL;
}
return size;
}
static ssize_t ksmbd_vfs_xattr_len(struct mnt_idmap *idmap,
struct dentry *dentry, char *xattr_name)
{
return vfs_getxattr(idmap, dentry, xattr_name, NULL, 0);
}
/**
* ksmbd_vfs_getxattr() - vfs helper for smb get extended attributes value
* @idmap: idmap
* @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 ksmbd_vfs_getxattr(struct mnt_idmap *idmap,
struct dentry *dentry,
char *xattr_name, char **xattr_buf)
{
ssize_t xattr_len;
char *buf;
*xattr_buf = NULL;
xattr_len = ksmbd_vfs_xattr_len(idmap, dentry, xattr_name);
if (xattr_len < 0)
return xattr_len;
buf = kmalloc(xattr_len + 1, GFP_KERNEL);
if (!buf)
return -ENOMEM;
xattr_len = vfs_getxattr(idmap, dentry, xattr_name,
(void *)buf, xattr_len);
if (xattr_len > 0)
*xattr_buf = buf;
else
kfree(buf);
return xattr_len;
}
/**
* ksmbd_vfs_setxattr() - vfs helper for smb set extended attributes value
* @idmap: idmap of the relevant mount
* @path: path of dentry to set XATTR at
* @attr_name: xattr name for setxattr
* @attr_value: xattr value to set
* @attr_size: size of xattr value
* @flags: destination buffer length
* @get_write: get write access to a mount
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_setxattr(struct mnt_idmap *idmap,
const struct path *path, const char *attr_name,
void *attr_value, size_t attr_size, int flags,
bool get_write)
{
int err;
if (get_write == true) {
err = mnt_want_write(path->mnt);
if (err)
return err;
}
err = vfs_setxattr(idmap,
path->dentry,
attr_name,
attr_value,
attr_size,
flags);
if (err)
ksmbd_debug(VFS, "setxattr failed, err %d\n", err);
if (get_write == true)
mnt_drop_write(path->mnt);
return err;
}
/**
* ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options
* @filp: file pointer for IO
* @option: smb IO options
*/
void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option)
{
struct address_space *mapping;
mapping = filp->f_mapping;
if (!option || !mapping)
return;
if (option & FILE_WRITE_THROUGH_LE) {
filp->f_flags |= O_SYNC;
} else if (option & FILE_SEQUENTIAL_ONLY_LE) {
filp->f_ra.ra_pages = inode_to_bdi(mapping->host)->ra_pages * 2;
spin_lock(&filp->f_lock);
filp->f_mode &= ~FMODE_RANDOM;
spin_unlock(&filp->f_lock);
} else if (option & FILE_RANDOM_ACCESS_LE) {
spin_lock(&filp->f_lock);
filp->f_mode |= FMODE_RANDOM;
spin_unlock(&filp->f_lock);
}
}
int ksmbd_vfs_zero_data(struct ksmbd_work *work, struct ksmbd_file *fp,
loff_t off, loff_t len)
{
smb_break_all_levII_oplock(work, fp, 1);
if (fp->f_ci->m_fattr & FILE_ATTRIBUTE_SPARSE_FILE_LE)
return vfs_fallocate(fp->filp,
FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE,
off, len);
return vfs_fallocate(fp->filp,
FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE,
off, len);
}
int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length,
struct file_allocated_range_buffer *ranges,
unsigned int in_count, unsigned int *out_count)
{
struct file *f = fp->filp;
struct inode *inode = file_inode(fp->filp);
loff_t maxbytes = (u64)inode->i_sb->s_maxbytes, end;
loff_t extent_start, extent_end;
int ret = 0;
if (start > maxbytes)
return -EFBIG;
if (!in_count)
return 0;
/*
* Shrink request scope to what the fs can actually handle.
*/
if (length > maxbytes || (maxbytes - length) < start)
length = maxbytes - start;
if (start + length > inode->i_size)
length = inode->i_size - start;
*out_count = 0;
end = start + length;
while (start < end && *out_count < in_count) {
extent_start = vfs_llseek(f, start, SEEK_DATA);
if (extent_start < 0) {
if (extent_start != -ENXIO)
ret = (int)extent_start;
break;
}
if (extent_start >= end)
break;
extent_end = vfs_llseek(f, extent_start, SEEK_HOLE);
if (extent_end < 0) {
if (extent_end != -ENXIO)
ret = (int)extent_end;
break;
} else if (extent_start >= extent_end) {
break;
}
ranges[*out_count].file_offset = cpu_to_le64(extent_start);
ranges[(*out_count)++].length =
cpu_to_le64(min(extent_end, end) - extent_start);
start = extent_end;
}
return ret;
}
int ksmbd_vfs_remove_xattr(struct mnt_idmap *idmap,
const struct path *path, char *attr_name,
bool get_write)
{
int err;
if (get_write == true) {
err = mnt_want_write(path->mnt);
if (err)
return err;
}
err = vfs_removexattr(idmap, path->dentry, attr_name);
if (get_write == true)
mnt_drop_write(path->mnt);
return err;
}
int ksmbd_vfs_unlink(struct file *filp)
{
int err = 0;
struct dentry *dir, *dentry = filp->f_path.dentry;
struct mnt_idmap *idmap = file_mnt_idmap(filp);
err = mnt_want_write(filp->f_path.mnt);
if (err)
return err;
dir = dget_parent(dentry);
err = ksmbd_vfs_lock_parent(dir, dentry);
if (err)
goto out;
dget(dentry);
if (S_ISDIR(d_inode(dentry)->i_mode))
err = vfs_rmdir(idmap, d_inode(dir), dentry);
else
err = vfs_unlink(idmap, d_inode(dir), dentry, NULL);
dput(dentry);
inode_unlock(d_inode(dir));
if (err)
ksmbd_debug(VFS, "failed to delete, err %d\n", err);
out:
dput(dir);
mnt_drop_write(filp->f_path.mnt);
return err;
}
static bool __dir_empty(struct dir_context *ctx, const char *name, int namlen,
loff_t offset, u64 ino, unsigned int d_type)
{
struct ksmbd_readdir_data *buf;
buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
if (!is_dot_dotdot(name, namlen))
buf->dirent_count++;
return !buf->dirent_count;
}
/**
* ksmbd_vfs_empty_dir() - check for empty directory
* @fp: ksmbd file pointer
*
* Return: true if directory empty, otherwise false
*/
int ksmbd_vfs_empty_dir(struct ksmbd_file *fp)
{
int err;
struct ksmbd_readdir_data readdir_data;
memset(&readdir_data, 0, sizeof(struct ksmbd_readdir_data));
set_ctx_actor(&readdir_data.ctx, __dir_empty);
readdir_data.dirent_count = 0;
err = iterate_dir(fp->filp, &readdir_data.ctx);
if (readdir_data.dirent_count)
err = -ENOTEMPTY;
else
err = 0;
return err;
}
static bool __caseless_lookup(struct dir_context *ctx, const char *name,
int namlen, loff_t offset, u64 ino,
unsigned int d_type)
{
struct ksmbd_readdir_data *buf;
int cmp = -EINVAL;
buf = container_of(ctx, struct ksmbd_readdir_data, ctx);
if (buf->used != namlen)
return true;
if (IS_ENABLED(CONFIG_UNICODE) && buf->um) {
const struct qstr q_buf = {.name = buf->private,
.len = buf->used};
const struct qstr q_name = {.name = name,
.len = namlen};
cmp = utf8_strncasecmp(buf->um, &q_buf, &q_name);
}
if (cmp < 0)
cmp = strncasecmp((char *)buf->private, name, namlen);
if (!cmp) {
memcpy((char *)buf->private, name, buf->used);
buf->dirent_count = 1;
return false;
}
return true;
}
/**
* ksmbd_vfs_lookup_in_dir() - lookup a file in a directory
* @dir: path info
* @name: filename to lookup
* @namelen: filename length
* @um: &struct unicode_map to use
*
* Return: 0 on success, otherwise error
*/
static int ksmbd_vfs_lookup_in_dir(const struct path *dir, char *name,
size_t namelen, struct unicode_map *um)
{
int ret;
struct file *dfilp;
int flags = O_RDONLY | O_LARGEFILE;
struct ksmbd_readdir_data readdir_data = {
.ctx.actor = __caseless_lookup,
.private = name,
.used = namelen,
.dirent_count = 0,
.um = um,
};
dfilp = dentry_open(dir, flags, current_cred());
if (IS_ERR(dfilp))
return PTR_ERR(dfilp);
ret = iterate_dir(dfilp, &readdir_data.ctx);
if (readdir_data.dirent_count > 0)
ret = 0;
fput(dfilp);
return ret;
}
/**
* ksmbd_vfs_kern_path_locked() - lookup a file and get path info
* @work: work
* @name: file path that is relative to share
* @flags: lookup flags
* @parent_path: if lookup succeed, return parent_path info
* @path: if lookup succeed, return path info
* @caseless: caseless filename lookup
*
* Return: 0 on success, otherwise error
*/
int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
unsigned int flags, struct path *parent_path,
struct path *path, bool caseless)
{
struct ksmbd_share_config *share_conf = work->tcon->share_conf;
int err;
err = ksmbd_vfs_path_lookup_locked(share_conf, name, flags, parent_path,
path);
if (!err)
return 0;
if (caseless) {
char *filepath;
size_t path_len, remain_len;
filepath = name;
path_len = strlen(filepath);
remain_len = path_len;
*parent_path = share_conf->vfs_path;
path_get(parent_path);
while (d_can_lookup(parent_path->dentry)) {
char *filename = filepath + path_len - remain_len;
char *next = strchrnul(filename, '/');
size_t filename_len = next - filename;
bool is_last = !next[0];
if (filename_len == 0)
break;
err = ksmbd_vfs_lookup_in_dir(parent_path, filename,
filename_len,
work->conn->um);
if (err)
goto out2;
next[0] = '\0';
err = vfs_path_lookup(share_conf->vfs_path.dentry,
share_conf->vfs_path.mnt,
filepath,
flags,
path);
if (err)
goto out2;
else if (is_last)
goto out1;
path_put(parent_path);
*parent_path = *path;
next[0] = '/';
remain_len -= filename_len + 1;
}
err = -EINVAL;
out2:
path_put(parent_path);
}
out1:
if (!err) {
err = mnt_want_write(parent_path->mnt);
if (err) {
path_put(path);
path_put(parent_path);
return err;
}
err = ksmbd_vfs_lock_parent(parent_path->dentry, path->dentry);
if (err) {
path_put(path);
path_put(parent_path);
}
}
return err;
}
void ksmbd_vfs_kern_path_unlock(struct path *parent_path, struct path *path)
{
inode_unlock(d_inode(parent_path->dentry));
mnt_drop_write(parent_path->mnt);
path_put(path);
path_put(parent_path);
}
struct dentry *ksmbd_vfs_kern_path_create(struct ksmbd_work *work,
const char *name,
unsigned int flags,
struct path *path)
{
char *abs_name;
struct dentry *dent;
abs_name = convert_to_unix_name(work->tcon->share_conf, name);
if (!abs_name)
return ERR_PTR(-ENOMEM);
dent = kern_path_create(AT_FDCWD, abs_name, path, flags);
kfree(abs_name);
return dent;
}
int ksmbd_vfs_remove_acl_xattrs(struct mnt_idmap *idmap,
const struct path *path)
{
char *name, *xattr_list = NULL;
ssize_t xattr_list_len;
int err = 0;
xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
if (xattr_list_len < 0) {
goto out;
} else if (!xattr_list_len) {
ksmbd_debug(SMB, "empty xattr in the file\n");
goto out;
}
err = mnt_want_write(path->mnt);
if (err)
goto out;
for (name = xattr_list; name - xattr_list < xattr_list_len;
name += strlen(name) + 1) {
ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
if (!strncmp(name, XATTR_NAME_POSIX_ACL_ACCESS,
sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1) ||
!strncmp(name, XATTR_NAME_POSIX_ACL_DEFAULT,
sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) - 1)) {
err = vfs_remove_acl(idmap, path->dentry, name);
if (err)
ksmbd_debug(SMB,
"remove acl xattr failed : %s\n", name);
}
}
mnt_drop_write(path->mnt);
out:
kvfree(xattr_list);
return err;
}
int ksmbd_vfs_remove_sd_xattrs(struct mnt_idmap *idmap, const struct path *path)
{
char *name, *xattr_list = NULL;
ssize_t xattr_list_len;
int err = 0;
xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
if (xattr_list_len < 0) {
goto out;
} else if (!xattr_list_len) {
ksmbd_debug(SMB, "empty xattr in the file\n");
goto out;
}
for (name = xattr_list; name - xattr_list < xattr_list_len;
name += strlen(name) + 1) {
ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
if (!strncmp(name, XATTR_NAME_SD, XATTR_NAME_SD_LEN)) {
err = ksmbd_vfs_remove_xattr(idmap, path, name, true);
if (err)
ksmbd_debug(SMB, "remove xattr failed : %s\n", name);
}
}
out:
kvfree(xattr_list);
return err;
}
static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(struct mnt_idmap *idmap,
struct inode *inode,
int acl_type)
{
struct xattr_smb_acl *smb_acl = NULL;
struct posix_acl *posix_acls;
struct posix_acl_entry *pa_entry;
struct xattr_acl_entry *xa_entry;
int i;
if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
return NULL;
posix_acls = get_inode_acl(inode, acl_type);
if (IS_ERR_OR_NULL(posix_acls))
return NULL;
smb_acl = kzalloc(sizeof(struct xattr_smb_acl) +
sizeof(struct xattr_acl_entry) * posix_acls->a_count,
GFP_KERNEL);
if (!smb_acl)
goto out;
smb_acl->count = posix_acls->a_count;
pa_entry = posix_acls->a_entries;
xa_entry = smb_acl->entries;
for (i = 0; i < posix_acls->a_count; i++, pa_entry++, xa_entry++) {
switch (pa_entry->e_tag) {
case ACL_USER:
xa_entry->type = SMB_ACL_USER;
xa_entry->uid = posix_acl_uid_translate(idmap, pa_entry);
break;
case ACL_USER_OBJ:
xa_entry->type = SMB_ACL_USER_OBJ;
break;
case ACL_GROUP:
xa_entry->type = SMB_ACL_GROUP;
xa_entry->gid = posix_acl_gid_translate(idmap, pa_entry);
break;
case ACL_GROUP_OBJ:
xa_entry->type = SMB_ACL_GROUP_OBJ;
break;
case ACL_OTHER:
xa_entry->type = SMB_ACL_OTHER;
break;
case ACL_MASK:
xa_entry->type = SMB_ACL_MASK;
break;
default:
pr_err("unknown type : 0x%x\n", pa_entry->e_tag);
goto out;
}
if (pa_entry->e_perm & ACL_READ)
xa_entry->perm |= SMB_ACL_READ;
if (pa_entry->e_perm & ACL_WRITE)
xa_entry->perm |= SMB_ACL_WRITE;
if (pa_entry->e_perm & ACL_EXECUTE)
xa_entry->perm |= SMB_ACL_EXECUTE;
}
out:
posix_acl_release(posix_acls);
return smb_acl;
}
int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn,
struct mnt_idmap *idmap,
const struct path *path,
struct smb_ntsd *pntsd, int len,
bool get_write)
{
int rc;
struct ndr sd_ndr = {0}, acl_ndr = {0};
struct xattr_ntacl acl = {0};
struct xattr_smb_acl *smb_acl, *def_smb_acl = NULL;
struct dentry *dentry = path->dentry;
struct inode *inode = d_inode(dentry);
acl.version = 4;
acl.hash_type = XATTR_SD_HASH_TYPE_SHA256;
acl.current_time = ksmbd_UnixTimeToNT(current_time(inode));
memcpy(acl.desc, "posix_acl", 9);
acl.desc_len = 10;
pntsd->osidoffset =
cpu_to_le32(le32_to_cpu(pntsd->osidoffset) + NDR_NTSD_OFFSETOF);
pntsd->gsidoffset =
cpu_to_le32(le32_to_cpu(pntsd->gsidoffset) + NDR_NTSD_OFFSETOF);
pntsd->dacloffset =
cpu_to_le32(le32_to_cpu(pntsd->dacloffset) + NDR_NTSD_OFFSETOF);
acl.sd_buf = (char *)pntsd;
acl.sd_size = len;
rc = ksmbd_gen_sd_hash(conn, acl.sd_buf, acl.sd_size, acl.hash);
if (rc) {
pr_err("failed to generate hash for ndr acl\n");
return rc;
}
smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
ACL_TYPE_ACCESS);
if (S_ISDIR(inode->i_mode))
def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
ACL_TYPE_DEFAULT);
rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode,
smb_acl, def_smb_acl);
if (rc) {
pr_err("failed to encode ndr to posix acl\n");
goto out;
}
rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset,
acl.posix_acl_hash);
if (rc) {
pr_err("failed to generate hash for ndr acl\n");
goto out;
}
rc = ndr_encode_v4_ntacl(&sd_ndr, &acl);
if (rc) {
pr_err("failed to encode ndr to posix acl\n");
goto out;
}
rc = ksmbd_vfs_setxattr(idmap, path,
XATTR_NAME_SD, sd_ndr.data,
sd_ndr.offset, 0, get_write);
if (rc < 0)
pr_err("Failed to store XATTR ntacl :%d\n", rc);
kfree(sd_ndr.data);
out:
kfree(acl_ndr.data);
kfree(smb_acl);
kfree(def_smb_acl);
return rc;
}
int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn,
struct mnt_idmap *idmap,
struct dentry *dentry,
struct smb_ntsd **pntsd)
{
int rc;
struct ndr n;
struct inode *inode = d_inode(dentry);
struct ndr acl_ndr = {0};
struct xattr_ntacl acl;
struct xattr_smb_acl *smb_acl = NULL, *def_smb_acl = NULL;
__u8 cmp_hash[XATTR_SD_HASH_SIZE] = {0};
rc = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_SD, &n.data);
if (rc <= 0)
return rc;
n.length = rc;
rc = ndr_decode_v4_ntacl(&n, &acl);
if (rc)
goto free_n_data;
smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
ACL_TYPE_ACCESS);
if (S_ISDIR(inode->i_mode))
def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(idmap, inode,
ACL_TYPE_DEFAULT);
rc = ndr_encode_posix_acl(&acl_ndr, idmap, inode, smb_acl,
def_smb_acl);
if (rc) {
pr_err("failed to encode ndr to posix acl\n");
goto out_free;
}
rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, cmp_hash);
if (rc) {
pr_err("failed to generate hash for ndr acl\n");
goto out_free;
}
if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) {
pr_err("hash value diff\n");
rc = -EINVAL;
goto out_free;
}
*pntsd = acl.sd_buf;
if (acl.sd_size < sizeof(struct smb_ntsd)) {
pr_err("sd size is invalid\n");
goto out_free;
}
(*pntsd)->osidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->osidoffset) -
NDR_NTSD_OFFSETOF);
(*pntsd)->gsidoffset = cpu_to_le32(le32_to_cpu((*pntsd)->gsidoffset) -
NDR_NTSD_OFFSETOF);
(*pntsd)->dacloffset = cpu_to_le32(le32_to_cpu((*pntsd)->dacloffset) -
NDR_NTSD_OFFSETOF);
rc = acl.sd_size;
out_free:
kfree(acl_ndr.data);
kfree(smb_acl);
kfree(def_smb_acl);
if (rc < 0) {
kfree(acl.sd_buf);
*pntsd = NULL;
}
free_n_data:
kfree(n.data);
return rc;
}
int ksmbd_vfs_set_dos_attrib_xattr(struct mnt_idmap *idmap,
const struct path *path,
struct xattr_dos_attrib *da,
bool get_write)
{
struct ndr n;
int err;
err = ndr_encode_dos_attr(&n, da);
if (err)
return err;
err = ksmbd_vfs_setxattr(idmap, path, XATTR_NAME_DOS_ATTRIBUTE,
(void *)n.data, n.offset, 0, get_write);
if (err)
ksmbd_debug(SMB, "failed to store dos attribute in xattr\n");
kfree(n.data);
return err;
}
int ksmbd_vfs_get_dos_attrib_xattr(struct mnt_idmap *idmap,
struct dentry *dentry,
struct xattr_dos_attrib *da)
{
struct ndr n;
int err;
err = ksmbd_vfs_getxattr(idmap, dentry, XATTR_NAME_DOS_ATTRIBUTE,
(char **)&n.data);
if (err > 0) {
n.length = err;
if (ndr_decode_dos_attr(&n, da))
err = -EINVAL;
kfree(n.data);
} else {
ksmbd_debug(SMB, "failed to load dos attribute in xattr\n");
}
return err;
}
/**
* ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format
* @p: destination buffer
* @ksmbd_kstat: ksmbd kstat wrapper
*
* Returns: pointer to the converted &struct file_directory_info
*/
void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat)
{
struct file_directory_info *info = (struct file_directory_info *)(*p);
struct kstat *kstat = ksmbd_kstat->kstat;
u64 time;
info->FileIndex = 0;
info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
time = ksmbd_UnixTimeToNT(kstat->atime);
info->LastAccessTime = cpu_to_le64(time);
time = ksmbd_UnixTimeToNT(kstat->mtime);
info->LastWriteTime = cpu_to_le64(time);
time = ksmbd_UnixTimeToNT(kstat->ctime);
info->ChangeTime = cpu_to_le64(time);
if (ksmbd_kstat->file_attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
info->EndOfFile = 0;
info->AllocationSize = 0;
} else {
info->EndOfFile = cpu_to_le64(kstat->size);
info->AllocationSize = cpu_to_le64(kstat->blocks << 9);
}
info->ExtFileAttributes = ksmbd_kstat->file_attributes;
return info;
}
int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work,
struct mnt_idmap *idmap,
struct dentry *dentry,
struct ksmbd_kstat *ksmbd_kstat)
{
struct ksmbd_share_config *share_conf = work->tcon->share_conf;
u64 time;
int rc;
struct path path = {
.mnt = share_conf->vfs_path.mnt,
.dentry = dentry,
};
rc = vfs_getattr(&path, ksmbd_kstat->kstat,
STATX_BASIC_STATS | STATX_BTIME,
AT_STATX_SYNC_AS_STAT);
if (rc)
return rc;
time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
ksmbd_kstat->create_time = time;
/*
* set default value for the case that store dos attributes is not yes
* or that acl is disable in server's filesystem and the config is yes.
*/
if (S_ISDIR(ksmbd_kstat->kstat->mode))
ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_DIRECTORY_LE;
else
ksmbd_kstat->file_attributes = FILE_ATTRIBUTE_ARCHIVE_LE;
if (test_share_config_flag(work->tcon->share_conf,
KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
struct xattr_dos_attrib da;
rc = ksmbd_vfs_get_dos_attrib_xattr(idmap, dentry, &da);
if (rc > 0) {
ksmbd_kstat->file_attributes = cpu_to_le32(da.attr);
ksmbd_kstat->create_time = da.create_time;
} else {
ksmbd_debug(VFS, "fail to load dos attribute.\n");
}
}
return 0;
}
ssize_t ksmbd_vfs_casexattr_len(struct mnt_idmap *idmap,
struct dentry *dentry, char *attr_name,
int attr_name_len)
{
char *name, *xattr_list = NULL;
ssize_t value_len = -ENOENT, xattr_list_len;
xattr_list_len = ksmbd_vfs_listxattr(dentry, &xattr_list);
if (xattr_list_len <= 0)
goto out;
for (name = xattr_list; name - xattr_list < xattr_list_len;
name += strlen(name) + 1) {
ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name));
if (strncasecmp(attr_name, name, attr_name_len))
continue;
value_len = ksmbd_vfs_xattr_len(idmap, dentry, name);
break;
}
out:
kvfree(xattr_list);
return value_len;
}
int ksmbd_vfs_xattr_stream_name(char *stream_name, char **xattr_stream_name,
size_t *xattr_stream_name_size, int s_type)
{
char *type, *buf;
if (s_type == DIR_STREAM)
type = ":$INDEX_ALLOCATION";
else
type = ":$DATA";
buf = kasprintf(GFP_KERNEL, "%s%s%s",
XATTR_NAME_STREAM, stream_name, type);
if (!buf)
return -ENOMEM;
*xattr_stream_name = buf;
*xattr_stream_name_size = strlen(buf) + 1;
return 0;
}
int ksmbd_vfs_copy_file_ranges(struct ksmbd_work *work,
struct ksmbd_file *src_fp,
struct ksmbd_file *dst_fp,
struct srv_copychunk *chunks,
unsigned int chunk_count,
unsigned int *chunk_count_written,
unsigned int *chunk_size_written,
loff_t *total_size_written)
{
unsigned int i;
loff_t src_off, dst_off, src_file_size;
size_t len;
int ret;
*chunk_count_written = 0;
*chunk_size_written = 0;
*total_size_written = 0;
if (!(src_fp->daccess & (FILE_READ_DATA_LE | FILE_EXECUTE_LE))) {
pr_err("no right to read(%pD)\n", src_fp->filp);
return -EACCES;
}
if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) {
pr_err("no right to write(%pD)\n", dst_fp->filp);
return -EACCES;
}
if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp))
return -EBADF;
smb_break_all_levII_oplock(work, dst_fp, 1);
if (!work->tcon->posix_extensions) {
for (i = 0; i < chunk_count; i++) {
src_off = le64_to_cpu(chunks[i].SourceOffset);
dst_off = le64_to_cpu(chunks[i].TargetOffset);
len = le32_to_cpu(chunks[i].Length);
if (check_lock_range(src_fp->filp, src_off,
src_off + len - 1, READ))
return -EAGAIN;
if (check_lock_range(dst_fp->filp, dst_off,
dst_off + len - 1, WRITE))
return -EAGAIN;
}
}
src_file_size = i_size_read(file_inode(src_fp->filp));
for (i = 0; i < chunk_count; i++) {
src_off = le64_to_cpu(chunks[i].SourceOffset);
dst_off = le64_to_cpu(chunks[i].TargetOffset);
len = le32_to_cpu(chunks[i].Length);
if (src_off + len > src_file_size)
return -E2BIG;
ret = vfs_copy_file_range(src_fp->filp, src_off,
dst_fp->filp, dst_off, len, 0);
if (ret == -EOPNOTSUPP || ret == -EXDEV)
ret = vfs_copy_file_range(src_fp->filp, src_off,
dst_fp->filp, dst_off, len,
COPY_FILE_SPLICE);
if (ret < 0)
return ret;
*chunk_count_written += 1;
*total_size_written += ret;
}
return 0;
}
void ksmbd_vfs_posix_lock_wait(struct file_lock *flock)
{
wait_event(flock->c.flc_wait, !flock->c.flc_blocker);
}
int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout)
{
return wait_event_interruptible_timeout(flock->c.flc_wait,
!flock->c.flc_blocker,
timeout);
}
void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock)
{
locks_delete_block(flock);
}
int ksmbd_vfs_set_init_posix_acl(struct mnt_idmap *idmap,
struct path *path)
{
struct posix_acl_state acl_state;
struct posix_acl *acls;
struct dentry *dentry = path->dentry;
struct inode *inode = d_inode(dentry);
int rc;
if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
return -EOPNOTSUPP;
ksmbd_debug(SMB, "Set posix acls\n");
rc = init_acl_state(&acl_state, 1);
if (rc)
return rc;
/* Set default owner group */
acl_state.owner.allow = (inode->i_mode & 0700) >> 6;
acl_state.group.allow = (inode->i_mode & 0070) >> 3;
acl_state.other.allow = inode->i_mode & 0007;
acl_state.users->aces[acl_state.users->n].uid = inode->i_uid;
acl_state.users->aces[acl_state.users->n++].perms.allow =
acl_state.owner.allow;
acl_state.groups->aces[acl_state.groups->n].gid = inode->i_gid;
acl_state.groups->aces[acl_state.groups->n++].perms.allow =
acl_state.group.allow;
acl_state.mask.allow = 0x07;
acls = posix_acl_alloc(6, GFP_KERNEL);
if (!acls) {
free_acl_state(&acl_state);
return -ENOMEM;
}
posix_state_to_acl(&acl_state, acls->a_entries);
rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
if (rc < 0)
ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
rc);
else if (S_ISDIR(inode->i_mode)) {
posix_state_to_acl(&acl_state, acls->a_entries);
rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT, acls);
if (rc < 0)
ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
rc);
}
free_acl_state(&acl_state);
posix_acl_release(acls);
return rc;
}
int ksmbd_vfs_inherit_posix_acl(struct mnt_idmap *idmap,
struct path *path, struct inode *parent_inode)
{
struct posix_acl *acls;
struct posix_acl_entry *pace;
struct dentry *dentry = path->dentry;
struct inode *inode = d_inode(dentry);
int rc, i;
if (!IS_ENABLED(CONFIG_FS_POSIX_ACL))
return -EOPNOTSUPP;
acls = get_inode_acl(parent_inode, ACL_TYPE_DEFAULT);
if (IS_ERR_OR_NULL(acls))
return -ENOENT;
pace = acls->a_entries;
for (i = 0; i < acls->a_count; i++, pace++) {
if (pace->e_tag == ACL_MASK) {
pace->e_perm = 0x07;
break;
}
}
rc = set_posix_acl(idmap, dentry, ACL_TYPE_ACCESS, acls);
if (rc < 0)
ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_ACCESS) failed, rc : %d\n",
rc);
if (S_ISDIR(inode->i_mode)) {
rc = set_posix_acl(idmap, dentry, ACL_TYPE_DEFAULT,
acls);
if (rc < 0)
ksmbd_debug(SMB, "Set posix acl(ACL_TYPE_DEFAULT) failed, rc : %d\n",
rc);
}
posix_acl_release(acls);
return rc;
}
Codebase Browser
linux