diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/cifsd/buffer_pool.c | 292 | ||||
| -rw-r--r-- | fs/cifsd/buffer_pool.h | 28 | ||||
| -rw-r--r-- | fs/cifsd/vfs.c | 1989 | ||||
| -rw-r--r-- | fs/cifsd/vfs.h | 314 | ||||
| -rw-r--r-- | fs/cifsd/vfs_cache.c | 855 | ||||
| -rw-r--r-- | fs/cifsd/vfs_cache.h | 213 |
6 files changed, 3691 insertions, 0 deletions
diff --git a/fs/cifsd/buffer_pool.c b/fs/cifsd/buffer_pool.c new file mode 100644 index 000000000000..864fea547c68 --- /dev/null +++ b/fs/cifsd/buffer_pool.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#include <linux/kernel.h> +#include <linux/wait.h> +#include <linux/sched.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/rwlock.h> + +#include "glob.h" +#include "buffer_pool.h" +#include "connection.h" +#include "mgmt/ksmbd_ida.h" + +static struct kmem_cache *filp_cache; + +struct wm { + struct list_head list; + unsigned int sz; + char buffer[0]; +}; + +struct wm_list { + struct list_head list; + unsigned int sz; + + spinlock_t wm_lock; + int avail_wm; + struct list_head idle_wm; + wait_queue_head_t wm_wait; +}; + +static LIST_HEAD(wm_lists); +static DEFINE_RWLOCK(wm_lists_lock); + +void *ksmbd_alloc(size_t size) +{ + return kvmalloc(size, GFP_KERNEL | __GFP_ZERO); +} + +void ksmbd_free(void *ptr) +{ + kvfree(ptr); +} + +static struct wm *wm_alloc(size_t sz, gfp_t flags) +{ + struct wm *wm; + size_t alloc_sz = sz + sizeof(struct wm); + + wm = kvmalloc(alloc_sz, flags); + if (!wm) + return NULL; + wm->sz = sz; + return wm; +} + +static int register_wm_size_class(size_t sz) +{ + struct wm_list *l, *nl; + + nl = kvmalloc(sizeof(struct wm_list), GFP_KERNEL); + if (!nl) + return -ENOMEM; + + nl->sz = sz; + spin_lock_init(&nl->wm_lock); + INIT_LIST_HEAD(&nl->idle_wm); + INIT_LIST_HEAD(&nl->list); + init_waitqueue_head(&nl->wm_wait); + nl->avail_wm = 0; + + write_lock(&wm_lists_lock); + list_for_each_entry(l, &wm_lists, list) { + if (l->sz == sz) { + write_unlock(&wm_lists_lock); + kvfree(nl); + return 0; + } + } + + list_add(&nl->list, &wm_lists); + write_unlock(&wm_lists_lock); + return 0; +} + +static struct wm_list *match_wm_list(size_t size) +{ + struct wm_list *l, *rl = NULL; + + read_lock(&wm_lists_lock); + list_for_each_entry(l, &wm_lists, list) { + if (l->sz == size) { + rl = l; + break; + } + } + read_unlock(&wm_lists_lock); + return rl; +} + +static struct wm *find_wm(size_t size) +{ + struct wm_list *wm_list; + struct wm *wm; + + wm_list = match_wm_list(size); + if (!wm_list) { + if (register_wm_size_class(size)) + return NULL; + wm_list = match_wm_list(size); + } + + if (!wm_list) + return NULL; + + while (1) { + spin_lock(&wm_list->wm_lock); + if (!list_empty(&wm_list->idle_wm)) { + wm = list_entry(wm_list->idle_wm.next, + struct wm, + list); + list_del(&wm->list); + spin_unlock(&wm_list->wm_lock); + return wm; + } + + if (wm_list->avail_wm > num_online_cpus()) { + spin_unlock(&wm_list->wm_lock); + wait_event(wm_list->wm_wait, + !list_empty(&wm_list->idle_wm)); + continue; + } + + wm_list->avail_wm++; + spin_unlock(&wm_list->wm_lock); + + wm = wm_alloc(size, GFP_KERNEL); + if (!wm) { + spin_lock(&wm_list->wm_lock); + wm_list->avail_wm--; + spin_unlock(&wm_list->wm_lock); + wait_event(wm_list->wm_wait, + !list_empty(&wm_list->idle_wm)); + continue; + } + break; + } + + return wm; +} + +static void release_wm(struct wm *wm, struct wm_list *wm_list) +{ + if (!wm) + return; + + spin_lock(&wm_list->wm_lock); + if (wm_list->avail_wm <= num_online_cpus()) { + list_add(&wm->list, &wm_list->idle_wm); + spin_unlock(&wm_list->wm_lock); + wake_up(&wm_list->wm_wait); + return; + } + + wm_list->avail_wm--; + spin_unlock(&wm_list->wm_lock); + ksmbd_free(wm); +} + +static void wm_list_free(struct wm_list *l) +{ + struct wm *wm; + + while (!list_empty(&l->idle_wm)) { + wm = list_entry(l->idle_wm.next, struct wm, list); + list_del(&wm->list); + kvfree(wm); + } + kvfree(l); +} + +static void wm_lists_destroy(void) +{ + struct wm_list *l; + + while (!list_empty(&wm_lists)) { + l = list_entry(wm_lists.next, struct wm_list, list); + list_del(&l->list); + wm_list_free(l); + } +} + +void ksmbd_free_request(void *addr) +{ + kvfree(addr); +} + +void *ksmbd_alloc_request(size_t size) +{ + return kvmalloc(size, GFP_KERNEL); +} + +void ksmbd_free_response(void *buffer) +{ + kvfree(buffer); +} + +void *ksmbd_alloc_response(size_t size) +{ + return kvmalloc(size, GFP_KERNEL | __GFP_ZERO); +} + +void *ksmbd_find_buffer(size_t size) +{ + struct wm *wm; + + wm = find_wm(size); + + WARN_ON(!wm); + if (wm) + return wm->buffer; + return NULL; +} + +void ksmbd_release_buffer(void *buffer) +{ + struct wm_list *wm_list; + struct wm *wm; + + if (!buffer) + return; + + wm = container_of(buffer, struct wm, buffer); + wm_list = match_wm_list(wm->sz); + WARN_ON(!wm_list); + if (wm_list) + release_wm(wm, wm_list); +} + +void *ksmbd_realloc_response(void *ptr, size_t old_sz, size_t new_sz) +{ + size_t sz = min(old_sz, new_sz); + void *nptr; + + nptr = ksmbd_alloc_response(new_sz); + if (!nptr) + return ptr; + memcpy(nptr, ptr, sz); + ksmbd_free_response(ptr); + return nptr; +} + +void ksmbd_free_file_struct(void *filp) +{ + kmem_cache_free(filp_cache, filp); +} + +void *ksmbd_alloc_file_struct(void) +{ + return kmem_cache_zalloc(filp_cache, GFP_KERNEL); +} + +void ksmbd_destroy_buffer_pools(void) +{ + wm_lists_destroy(); + ksmbd_work_pool_destroy(); + kmem_cache_destroy(filp_cache); +} + +int ksmbd_init_buffer_pools(void) +{ + if (ksmbd_work_pool_init()) + goto out; + + filp_cache = kmem_cache_create("ksmbd_file_cache", + sizeof(struct ksmbd_file), 0, + SLAB_HWCACHE_ALIGN, NULL); + if (!filp_cache) + goto out; + + return 0; + +out: + ksmbd_err("failed to allocate memory\n"); + ksmbd_destroy_buffer_pools(); + return -ENOMEM; +} diff --git a/fs/cifsd/buffer_pool.h b/fs/cifsd/buffer_pool.h new file mode 100644 index 000000000000..2b3d03afcf27 --- /dev/null +++ b/fs/cifsd/buffer_pool.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_BUFFER_POOL_H__ +#define __KSMBD_BUFFER_POOL_H__ + +void *ksmbd_find_buffer(size_t size); +void ksmbd_release_buffer(void *buffer); + +void *ksmbd_alloc(size_t size); +void ksmbd_free(void *ptr); + +void ksmbd_free_request(void *addr); +void *ksmbd_alloc_request(size_t size); +void ksmbd_free_response(void *buffer); +void *ksmbd_alloc_response(size_t size); + +void *ksmbd_realloc_response(void *ptr, size_t old_sz, size_t new_sz); + +void ksmbd_free_file_struct(void *filp); +void *ksmbd_alloc_file_struct(void); + +void ksmbd_destroy_buffer_pools(void); +int ksmbd_init_buffer_pools(void); + +#endif /* __KSMBD_BUFFER_POOL_H__ */ diff --git a/fs/cifsd/vfs.c b/fs/cifsd/vfs.c new file mode 100644 index 000000000000..00f80ca45690 --- /dev/null +++ b/fs/cifsd/vfs.c @@ -0,0 +1,1989 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#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> +#include <linux/xattr.h> +#include <linux/falloc.h> +#include <linux/genhd.h> +#include <linux/blkdev.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 "glob.h" +#include "oplock.h" +#include "connection.h" +#include "buffer_pool.h" +#include "vfs.h" +#include "vfs_cache.h" +#include "smbacl.h" +#include "ndr.h" +#include "auth.h" + +#include "time_wrappers.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 char *extract_last_component(char *path) +{ + char *p = strrchr(path, '/'); + + if (p && p[1] != '\0') { + *p = '\0'; + p++; + } else { + p = NULL; + ksmbd_err("Invalid path %s\n", path); + } + return p; +} + +static void rollback_path_modification(char *filename) +{ + if (filename) { + filename--; + *filename = '/'; + } +} + +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)); +} + +static void ksmbd_vfs_inherit_smack(struct ksmbd_work *work, + struct dentry *dir_dentry, + struct dentry *dentry) +{ + char *name, *xattr_list = NULL, *smack_buf; + int value_len, xattr_list_len; + + if (!test_share_config_flag(work->tcon->share_conf, + KSMBD_SHARE_FLAG_INHERIT_SMACK)) + return; + + xattr_list_len = ksmbd_vfs_listxattr(dir_dentry, &xattr_list); + if (xattr_list_len < 0) { + goto out; + } else if (!xattr_list_len) { + ksmbd_err("no ea data in the file\n"); + return; + } + + for (name = xattr_list; name - xattr_list < xattr_list_len; + name += strlen(name) + 1) { + int rc; + + ksmbd_debug(VFS, "%s, len %zd\n", name, strlen(name)); + if (strcmp(name, XATTR_NAME_SMACK)) + continue; + + value_len = ksmbd_vfs_getxattr(dir_dentry, name, &smack_buf); + if (value_len <= 0) + continue; + + rc = ksmbd_vfs_setxattr(dentry, XATTR_NAME_SMACK, smack_buf, + value_len, 0); + ksmbd_free(smack_buf); + if (rc < 0) + ksmbd_err("ksmbd_vfs_setxattr() failed: %d\n", rc); + } +out: + ksmbd_vfs_xattr_free(xattr_list); +} + +int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode, bool delete) +{ + int mask; + + mask = 0; + acc_mode &= O_ACCMODE; + + if (acc_mode == O_RDONLY) + mask = MAY_READ; + else if (acc_mode == O_WRONLY) + mask = MAY_WRITE; + else if (acc_mode == O_RDWR) + mask = MAY_READ | MAY_WRITE; + + if (inode_permission(&init_user_ns, d_inode(dentry), mask | MAY_OPEN)) + return -EACCES; + + if (delete) { + struct dentry *parent; + + parent = dget_parent(dentry); + if (!parent) + return -EINVAL; + + if (inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE)) { + dput(parent); + return -EACCES; + } + dput(parent); + } + return 0; +} + +int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32 *daccess) +{ + struct dentry *parent; + + *daccess = cpu_to_le32(FILE_READ_ATTRIBUTES | READ_CONTROL); + + if (!inode_permission(&init_user_ns, 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(&init_user_ns, d_inode(dentry), MAY_OPEN | MAY_READ)) + *daccess |= FILE_READ_DATA_LE | FILE_READ_EA_LE; + + if (!inode_permission(&init_user_ns, d_inode(dentry), MAY_OPEN | MAY_EXEC)) + *daccess |= FILE_EXECUTE_LE; + + parent = dget_parent(dentry); + if (!parent) + return 0; + + if (!inode_permission(&init_user_ns, d_inode(parent), MAY_EXEC | MAY_WRITE)) + *daccess |= FILE_DELETE_LE; + dput(parent); + return 0; +} + + +/** + * ksmbd_vfs_create() - vfs helper for smb create file + * @work: work + * @name: file name + * @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 = kern_path_create(AT_FDCWD, name, &path, 0); + if (IS_ERR(dentry)) { + err = PTR_ERR(dentry); + if (err != -ENOENT) + ksmbd_err("path create failed for %s, err %d\n", + name, err); + return err; + } + + mode |= S_IFREG; + err = vfs_create(&init_user_ns, d_inode(path.dentry), dentry, mode, true); + if (!err) { + ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), + d_inode(dentry)); + ksmbd_vfs_inherit_smack(work, path.dentry, dentry); + } else { + ksmbd_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 + * @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 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) + ksmbd_debug(VFS, "path create failed for %s, err %d\n", + name, err); + return err; + } + + mode |= S_IFDIR; + err = vfs_mkdir(&init_user_ns, d_inode(path.dentry), dentry, mode); + if (!err) { + ksmbd_vfs_inherit_owner(work, d_inode(path.dentry), + d_inode(dentry)); + ksmbd_vfs_inherit_smack(work, path.dentry, dentry); + } else + ksmbd_err("mkdir(%s): creation failed (err:%d)\n", name, err); + + done_path_create(&path, dentry); + return err; +} + +static ssize_t ksmbd_vfs_getcasexattr(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(dentry, + name, + attr_value); + if (value_len < 0) + ksmbd_err("failed to get xattr in file\n"); + break; + } + +out: + ksmbd_vfs_xattr_free(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; + int err; + + ksmbd_debug(VFS, "read stream data pos : %llu, count : %zd\n", + *pos, count); + + v_len = ksmbd_vfs_getcasexattr(fp->filp->f_path.dentry, + fp->stream.name, + fp->stream.size, + &stream_buf); + if (v_len == -ENOENT) { + ksmbd_err("not found stream in xattr : %zd\n", v_len); + err = -ENOENT; + return err; + } + + memcpy(buf, &stream_buf[*pos], count); + return v_len > count ? count : v_len; +} + +/** + * 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 = file_inode(filp)->i_flctx; + int error = 0; + + if (!ctx || list_empty_careful(&ctx->flc_posix)) + return 0; + + spin_lock(&ctx->flc_lock); + list_for_each_entry(flock, &ctx->flc_posix, fl_list) { + /* check conflict locks */ + if (flock->fl_end >= start && end >= flock->fl_start) { + if (flock->fl_type == F_RDLCK) { + if (type == WRITE) { + ksmbd_err("not allow write by shared lock\n"); + error = 1; + goto out; + } + } else if (flock->fl_type == F_WRLCK) { + /* check owner in lock */ + if (flock->fl_file != filp) { + error = 1; + ksmbd_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 + * @fid: file id of open file + * @count: read byte count + * @pos: file pos + * + * 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) +{ + struct file *filp; + ssize_t nbytes = 0; + char *rbuf, *name; + struct inode *inode; + char namebuf[NAME_MAX]; + int ret; + + rbuf = AUX_PAYLOAD(work); + filp = fp->filp; + inode = d_inode(filp->f_path.dentry); + 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))) { + ksmbd_err("no right to read(%s)\n", FP_FILENAME(fp)); + return -EACCES; + } + } + + if (ksmbd_stream_fd(fp)) + return ksmbd_vfs_stream_read(fp, rbuf, pos, count); + + ret = check_lock_range(filp, *pos, *pos + count - 1, + READ); + if (ret) { + ksmbd_err("unable to read due to lock\n"); + return -EAGAIN; + } + + nbytes = kernel_read(filp, rbuf, count, pos); + if (nbytes < 0) { + name = d_path(&filp->f_path, namebuf, sizeof(namebuf)); + if (IS_ERR(name)) + name = "(error)"; + ksmbd_err("smb read failed for (%s), err = %zd\n", + name, 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; + size_t size, 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(fp->filp->f_path.dentry, + fp->stream.name, + fp->stream.size, + &stream_buf); + if (v_len == -ENOENT) { + ksmbd_err("not found stream in xattr : %zd\n", v_len); + err = -ENOENT; + goto out; + } + + if (v_len < size) { + wbuf = ksmbd_alloc(size); + if (!wbuf) { + err = -ENOMEM; + goto out; + } + + if (v_len > 0) + memcpy(wbuf, stream_buf, v_len); + stream_buf = wbuf; + } + + memcpy(&stream_buf[*pos], buf, count); + + err = ksmbd_vfs_setxattr(fp->filp->f_path.dentry, + fp->stream.name, + (void *)stream_buf, + size, + 0); + if (err < 0) + goto out; + + fp->filp->f_pos = *pos; + err = 0; +out: + ksmbd_free(stream_buf); + return err; +} + +/** + * ksmbd_vfs_write() - vfs helper for smb file write + * @work: work + * @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 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 ksmbd_session *sess = work->sess; + struct file *filp; + loff_t offset = *pos; + int err = 0; + + if (sess->conn->connection_type) { + if (!(fp->daccess & FILE_WRITE_DATA_LE)) { + ksmbd_err("no right to write(%s)\n", FP_FILENAME(fp)); + 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; + } + + err = check_lock_range(filp, *pos, *pos + count - 1, WRITE); + if (err) { + ksmbd_err("unable to write due to lock\n"); + err = -EAGAIN; + goto out; + } + + /* 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) + ksmbd_err("fsync failed for filename = %s, err = %d\n", + FP_FILENAME(fp), err); + } + +out: + return err; +} + +/** + * ksmbd_vfs_getattr() - vfs helper for smb getattr + * @work: work + * @fid: file id of open file + * @attrs: inode attributes + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_getattr(struct path *path, struct kstat *stat) +{ + int err; + + err = vfs_getattr(path, stat, STATX_BTIME, AT_STATX_SYNC_AS_STAT); + if (err) + ksmbd_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 + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t p_id) +{ + struct ksmbd_file *fp; + int err; + + fp = ksmbd_lookup_fd_slow(work, fid, p_id); + if (!fp) { + ksmbd_err("failed to get filp for fid %llu\n", fid); + return -ENOENT; + } + err = vfs_fsync(fp->filp, 0); + if (err < 0) + ksmbd_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 + * @name: absolute directory or file name + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name) +{ + struct path parent; + struct dentry *dir, *dentry; + char *last; + int err = -ENOENT; + + last = extract_last_component(name); + if (!last) + return -ENOENT; + + if (ksmbd_override_fsids(work)) + return -ENOMEM; + + err = kern_path(name, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &parent); + if (err) { + ksmbd_debug(VFS, "can't get %s, err %d\n", name, err); + ksmbd_revert_fsids(work); + rollback_path_modification(last); + return err; + } + + dir = parent.dentry; + if (!d_inode(dir)) + goto out; + + inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); + dentry = lookup_one_len(last, dir, strlen(last)); + if (IS_ERR(dentry)) { + err = PTR_ERR(dentry); + ksmbd_debug(VFS, "%s: lookup failed, err %d\n", last, err); + goto out_err; + } + + if (!d_inode(dentry) || !d_inode(dentry)->i_nlink) { + dput(dentry); + err = -ENOENT; + goto out_err; + } + + if (S_ISDIR(d_inode(dentry)->i_mode)) { + err = vfs_rmdir(&init_user_ns, d_inode(dir), dentry); + if (err && err != -ENOTEMPTY) + ksmbd_debug(VFS, "%s: rmdir failed, err %d\n", name, + err); + } else { + err = vfs_unlink(&init_user_ns, d_inode(dir), dentry, NULL); + if (err) + ksmbd_debug(VFS, "%s: unlink failed, err %d\n", name, + err); + } + + dput(dentry); +out_err: + inode_unlock(d_inode(dir)); +out: + rollback_path_modification(last); + path_put(&parent); + ksmbd_revert_fsids(work); + return err; +} + +/** + * ksmbd_vfs_link() - vfs helper for creating smb hardlink + * @oldname: source file name + * @newname: hardlink name + * + * 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_FOLLOW, &oldpath); + if (err) { + ksmbd_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); + ksmbd_err("path create err for %s, err %d\n", newname, err); + goto out2; + } + + err = -EXDEV; + if (oldpath.mnt != newpath.mnt) { + ksmbd_err("vfs_link failed err %d\n", err); + goto out3; + } + + err = vfs_link(oldpath.dentry, &init_user_ns, 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; +} + +static int __ksmbd_vfs_rename(struct ksmbd_work *work, + struct dentry *src_dent_parent, + struct dentry *src_dent, + struct dentry *dst_dent_parent, + struct dentry *trap_dent, + char *dst_name) +{ + struct dentry *dst_dent; + int err; + + spin_lock(&src_dent->d_lock); + list_for_each_entry(dst_dent, &src_dent->d_subdirs, d_child) { + struct ksmbd_file *child_fp; + + if (d_really_is_negative(dst_dent)) + continue; + + child_fp = ksmbd_lookup_fd_inode(d_inode(dst_dent)); + if (child_fp) { + spin_unlock(&src_dent->d_lock); + ksmbd_debug(VFS, "Forbid rename, sub file/dir is in use\n"); + return -EACCES; + } + } + spin_unlock(&src_dent->d_lock); + + if (d_really_is_negative(src_dent_parent)) + return -ENOENT; + if (d_really_is_negative(dst_dent_parent)) + return -ENOENT; + if (d_really_is_negative(src_dent)) + return -ENOENT; + if (src_dent == trap_dent) + return -EINVAL; + + if (ksmbd_override_fsids(work)) + return -ENOMEM; + + dst_dent = lookup_one_len(dst_name, dst_dent_parent, strlen(dst_name)); + err = PTR_ERR(dst_dent); + if (IS_ERR(dst_dent)) { + ksmbd_err("lookup failed %s [%d]\n", dst_name, err); + goto out; + } + + err = -ENOTEMPTY; + if (dst_dent != trap_dent && !d_really_is_positive(dst_dent)) { + struct renamedata rd = { + .old_mnt_userns = &init_user_ns, + .old_dir = d_inode(src_dent_parent), + .old_dentry = src_dent, + .new_mnt_userns = &init_user_ns, + .new_dir = d_inode(dst_dent_parent), + .new_dentry = dst_dent, + }; + err = vfs_rename(&rd); + } + if (err) + ksmbd_err("vfs_rename failed err %d\n", err); + if (dst_dent) + dput(dst_dent); +out: + ksmbd_revert_fsids(work); + return err; +} + +int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp, + char *newname) +{ + struct path dst_path; + struct dentry *src_dent_parent, *dst_dent_parent; + struct dentry *src_dent, *trap_dent; + char *dst_name; + int err; + + dst_name = extract_last_component(newname); + if (!dst_name) + return -EINVAL; + + src_dent_parent = dget_parent(fp->filp->f_path.dentry); + if (!src_dent_parent) + return -EINVAL; + + src_dent = fp->filp->f_path.dentry; + dget(src_dent); + + err = kern_path(newname, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &dst_path); + if (err) { + ksmbd_debug(VFS, "Cannot get path for %s [%d]\n", newname, err); + goto out; + } + dst_dent_parent = dst_path.dentry; + dget(dst_dent_parent); + + trap_dent = lock_rename(src_dent_parent, dst_dent_parent); + err = __ksmbd_vfs_rename(work, + src_dent_parent, + src_dent, + dst_dent_parent, + trap_dent, + dst_name); + unlock_rename(src_dent_parent, dst_dent_parent); + dput(dst_dent_parent); + path_put(&dst_path); +out: + dput(src_dent); + dput(src_dent_parent); + return err; +} + +/** + * ksmbd_vfs_truncate() - vfs helper for smb file truncate + * @work: work + * @name: old filename + * @fid: file id of old file + * @size: truncate to given size + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name, + struct ksmbd_file *fp, loff_t size) +{ + struct path path; + int err = 0; + struct inode *inode; + + if (name) { + err = kern_path(name, 0, &path); + if (err) { + ksmbd_err("cannot get linux path for %s, err %d\n", + name, err); + return err; + } + err = vfs_truncate(&path, size); + if (err) + ksmbd_err("truncate failed for %s err %d\n", + name, err); + path_put(&path); + } else { + struct file *filp; + + filp = fp->filp; + + /* Do we need to break any of a levelII oplock? */ + smb_break_all_levII_oplock(work, fp, 1); + + 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) { + ksmbd_err("failed due to lock\n"); + return -EAGAIN; + } + + err = vfs_truncate(&filp->f_path, size); + if (err) + ksmbd_err("truncate failed for filename : %s err %d\n", + fp->filename, err); + } + + return err; +} + +/** + * ksmbd_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 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 = ksmbd_alloc(size); + if (!vlist) + return -ENOMEM; + + *list = vlist; + size = vfs_listxattr(dentry, vlist, size); + if (size < 0) { + ksmbd_debug(VFS, "listxattr failed\n"); + ksmbd_vfs_xattr_free(vlist); + *list = NULL; + } + + return size; +} + +static ssize_t ksmbd_vfs_xattr_len(struct dentry *dentry, + char *xattr_name) +{ + return vfs_getxattr(&init_user_ns, dentry, xattr_name, NULL, 0); +} + +/** + * ksmbd_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 ksmbd_vfs_getxattr(struct dentry *dentry, + char *xattr_name, + char **xattr_buf) +{ + ssize_t xattr_len; + char *buf; + + *xattr_buf = NULL; + xattr_len = ksmbd_vfs_xattr_len(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(&init_user_ns, 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 + * @dentry: dentry to set XATTR at + * @name: xattr name for setxattr + * @value: xattr value to set + * @size: size of xattr value + * @flags: destination buffer length + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_setxattr(struct dentry *dentry, + const char *attr_name, + const void *attr_value, + size_t attr_size, + int flags) +{ + int err; + + err = vfs_setxattr(&init_user_ns, dentry, + attr_name, + attr_value, + attr_size, + flags); + if (err) + ksmbd_debug(VFS, "setxattr failed, err %d\n", err); + return err; +} + +/** + * ksmbd_vfs_set_fadvise() - convert smb IO caching options to linux options + * @filp: file pointer for IO + * @options: 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); + } +} + +/** + * ksmbd_vfs_lock() - vfs helper for smb file locking + * @filp: the file to apply the lock to + * @cmd: type of locking operation (F_SETLK, F_GETLK, etc.) + * @flock: The lock to be applied + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_lock(struct file *filp, int cmd, + struct file_lock *flock) +{ + ksmbd_debug(VFS, "calling vfs_lock_file\n"); + return vfs_lock_file(filp, cmd, flock, NULL); +} + +int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata) +{ + return iterate_dir(file, &rdata->ctx); +} + +int ksmbd_vfs_alloc_size(struct ksmbd_work *work, + struct ksmbd_file *fp, + loff_t len) +{ + smb_break_all_levII_oplock(work, fp, 1); + return vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0, len); +} + +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 & ATTR_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, off, len); +} + +int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, + struct file_allocated_range_buffer *ranges, + int in_count, int *out_count) +{ + struct file *f = fp->filp; + struct inode *inode = FP_INODE(fp); + 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 = f->f_op->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 = f->f_op->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 dentry *dentry, char *attr_name) +{ + return vfs_removexattr(&init_user_ns, dentry, attr_name); +} + +void ksmbd_vfs_xattr_free(char *xattr) +{ + ksmbd_free(xattr); +} + +int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry) +{ + int err = 0; + + dget(dentry); + inode_lock_nested(d_inode(dir), I_MUTEX_PARENT); + if (!d_inode(dentry) || !d_inode(dentry)->i_nlink) { + err = -ENOENT; + goto out; + } + + if (S_ISDIR(d_inode(dentry)->i_mode)) + err = vfs_rmdir(&init_user_ns, d_inode(dir), dentry); + else + err = vfs_unlink(&init_user_ns, d_inode(dir), dentry, NULL); + +out: + inode_unlock(d_inode(dir)); + dput(dentry); + if (err) + ksmbd_debug(VFS, "failed to delete, err %d\n", err); + + return err; +} + +/* + * ksmbd_vfs_get_logical_sector_size() - get logical sector size from inode + * @inode: inode + * + * Return: logical sector size + */ +unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode) +{ + struct request_queue *q; + unsigned short ret_val = 512; + + if (!inode->i_sb->s_bdev) + return ret_val; + + q = inode->i_sb->s_bdev->bd_disk->queue; + + if (q && q->limits.logical_block_size) + ret_val = q->limits.logical_block_size; + + return ret_val; +} + +/* + * ksmbd_vfs_get_smb2_sector_size() - get fs sector sizes + * @inode: inode + * @fs_ss: fs sector size struct + */ +void ksmbd_vfs_smb2_sector_size(struct inode *inode, + struct ksmbd_fs_sector_size *fs_ss) +{ + struct request_queue *q; + + fs_ss->logical_sector_size = 512; + fs_ss->physical_sector_size = 512; + fs_ss->optimal_io_size = 512; + + if (!inode->i_sb->s_bdev) + return; + + q = inode->i_sb->s_bdev->bd_disk->queue; + + if (q) { + if (q->limits.logical_block_size) + fs_ss->logical_sector_size = + q->limits.logical_block_size; + if (q->limits.physical_block_size) + fs_ss->physical_sector_size = + q->limits.physical_block_size; + if (q->limits.io_opt) + fs_ss->optimal_io_size = q->limits.io_opt; + } +} + +static int __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); + buf->dirent_count++; + + if (buf->dirent_count > 2) + return -ENOTEMPTY; + return 0; +} + +/** + * 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 = ksmbd_vfs_readdir(fp->filp, &readdir_data); + if (readdir_data.dirent_count > 2) + err = -ENOTEMPTY; + else + err = 0; + return err; +} + +static int __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; + + buf = container_of(ctx, struct ksmbd_readdir_data, ctx); + + if (buf->used != namlen) + return 0; + if (!strncasecmp((char *)buf->private, name, namlen)) { + memcpy((char *)buf->private, name, namlen); + buf->dirent_count = 1; + return -EEXIST; + } + return 0; +} + +/** + * ksmbd_vfs_lookup_in_dir() - lookup a file in a directory + * @dirname: directory name + * @filename: filename to lookup + * + * Return: 0 on success, otherwise error + */ +static int ksmbd_vfs_lookup_in_dir(char *dirname, char *filename) +{ + struct path dir_path; + int ret; + struct file *dfilp; + int flags = O_RDONLY|O_LARGEFILE; + int dirnamelen = strlen(dirname); + struct ksmbd_readdir_data readdir_data = { + .ctx.actor = __caseless_lookup, + .private = filename, + .used = strlen(filename), + }; + + ret = ksmbd_vfs_kern_path(dirname, 0, &dir_path, true); + if (ret) + goto error; + + dfilp = dentry_open(&dir_path, flags, current_cred()); + if (IS_ERR(dfilp)) { + path_put(&dir_path); + ksmbd_err("cannot open directory %s\n", dirname); + ret = -EINVAL; + goto error; + } + + ret = ksmbd_vfs_readdir(dfilp, &readdir_data); + if (readdir_data.dirent_count > 0) + ret = 0; + + fput(dfilp); + path_put(&dir_path); +error: + dirname[dirnamelen] = '/'; + return ret; +} + +/** + * ksmbd_vfs_kern_path() - lookup a file and get path info + * @name: name of file for lookup + * @flags: lookup flags + * @path: if lookup succeed, return path info + * @caseless: caseless filename lookup + * + * Return: 0 on success, otherwise error + */ +int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path *path, + bool caseless) +{ + char *filename = NULL; + int err; + + err = kern_path(name, flags, path); + if (!err) + return err; + + if (caseless) { + filename = extract_last_component(name); + if (!filename) + goto out; + + /* root reached */ + if (strlen(name) == 0) + goto out; + + err = ksmbd_vfs_lookup_in_dir(name, filename); + if (err) + goto out; + err = kern_path(name, flags, path); + } + +out: + rollback_path_modification(filename); + return err; +} + +int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry) +{ + char *name, *xattr_list = NULL; + ssize_t xattr_list_len; + int err = 0; + + xattr_list_len = ksmbd_vfs_listxattr(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_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 = ksmbd_vfs_remove_xattr(dentry, name); + if (err) + ksmbd_debug(SMB, + "remove acl xattr failed : %s\n", name); + } + } +out: + ksmbd_vfs_xattr_free(xattr_list); + return err; +} + +int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry) +{ + char *name, *xattr_list = NULL; + ssize_t xattr_list_len; + int err = 0; + + xattr_list_len = ksmbd_vfs_listxattr(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(dentry, name); + if (err) + ksmbd_debug(SMB, "remove xattr failed : %s\n", name); + } + } +out: + ksmbd_vfs_xattr_free(xattr_list); + return err; +} + +static struct xattr_smb_acl *ksmbd_vfs_make_xattr_posix_acl(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; + + posix_acls = ksmbd_vfs_get_acl(inode, acl_type); + if (!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 = from_kuid(&init_user_ns, pa_entry->e_uid); + 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 = from_kgid(&init_user_ns, pa_entry->e_gid); + 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: + ksmbd_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 dentry *dentry, + struct smb_ntsd *pntsd, int len) +{ + 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 inode *inode = dentry->d_inode; + + acl.version = 4; + acl.hash_type = XATTR_SD_HASH_TYPE_SHA256; + acl.current_time = ksmbd_UnixTimeToNT(current_time(dentry->d_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) { + ksmbd_err("failed to generate hash for ndr acl\n"); + return rc; + } + + smb_acl = ksmbd_vfs_make_xattr_posix_acl(dentry->d_inode, ACL_TYPE_ACCESS); + if (S_ISDIR(inode->i_mode)) + def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(dentry->d_inode, + ACL_TYPE_DEFAULT); + + rc = ndr_encode_posix_acl(&acl_ndr, inode, smb_acl, def_smb_acl); + if (rc) { + ksmbd_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) { + ksmbd_err("failed to generate hash for ndr acl\n"); + goto out; + } + + rc = ndr_encode_v4_ntacl(&sd_ndr, &acl); + if (rc) { + ksmbd_err("failed to encode ndr to posix acl\n"); + goto out; + } + + rc = ksmbd_vfs_setxattr(dentry, XATTR_NAME_SD, sd_ndr.data, + sd_ndr.offset, 0); + if (rc < 0) + ksmbd_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 dentry *dentry, + struct smb_ntsd **pntsd) +{ + int rc; + struct ndr n; + + rc = ksmbd_vfs_getxattr(dentry, XATTR_NAME_SD, &n.data); + if (rc > 0) { + struct inode *inode = dentry->d_inode; + 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}; + + n.length = rc; + rc = ndr_decode_v4_ntacl(&n, &acl); + if (rc) + return rc; + + smb_acl = ksmbd_vfs_make_xattr_posix_acl(inode, + ACL_TYPE_ACCESS); + if (S_ISDIR(inode->i_mode)) + def_smb_acl = ksmbd_vfs_make_xattr_posix_acl(inode, + ACL_TYPE_DEFAULT); + + rc = ndr_encode_posix_acl(&acl_ndr, inode, smb_acl, def_smb_acl); + if (rc) { + ksmbd_err("failed to encode ndr to posix acl\n"); + goto out; + } + + rc = ksmbd_gen_sd_hash(conn, acl_ndr.data, acl_ndr.offset, + cmp_hash); + if (rc) { + ksmbd_err("failed to generate hash for ndr acl\n"); + goto out; + } + + if (memcmp(cmp_hash, acl.posix_acl_hash, XATTR_SD_HASH_SIZE)) { + ksmbd_err("hash value diff\n"); + rc = -EINVAL; + goto out; + } + + *pntsd = acl.sd_buf; + (*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: + kfree(n.data); + kfree(acl_ndr.data); + kfree(smb_acl); + kfree(def_smb_acl); + } + + return rc; +} + +int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry, + struct xattr_dos_attrib *da) +{ + struct ndr n; + int err; + + err = ndr_encode_dos_attr(&n, da); + if (err) + return err; + + err = ksmbd_vfs_setxattr(dentry, + XATTR_NAME_DOS_ATTRIBUTE, + (void *)n.data, + n.offset, + 0); + 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 dentry *dentry, + struct xattr_dos_attrib *da) +{ + struct ndr n; + int err; + + err = ksmbd_vfs_getxattr(dentry, + XATTR_NAME_DOS_ATTRIBUTE, + (char **)&n.data); + if (err > 0) { + n.length = err; + if (ndr_decode_dos_attr(&n, da)) + err = -EINVAL; + ksmbd_free(n.data); + } else + ksmbd_debug(SMB, "failed to load dos attribute in xattr\n"); + + return err; +} + +struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags) +{ +#if IS_ENABLED(CONFIG_FS_POSIX_ACL) + return posix_acl_alloc(count, flags); +#else + return NULL; +#endif +} + +struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type) +{ +#if IS_ENABLED(CONFIG_FS_POSIX_ACL) + return get_acl(inode, type); +#else + return NULL; +#endif +} + +int ksmbd_vfs_set_posix_acl(struct inode *inode, int type, + struct posix_acl *acl) +{ +#if IS_ENABLED(CONFIG_FS_POSIX_ACL) + return set_posix_acl(&init_user_ns, inode, type, acl); +#else + return -EOPNOTSUPP; +#endif +} + +/** + * ksmbd_vfs_init_kstat() - convert unix stat information to smb stat format + * @p: destination buffer + * @ksmbd_kstat: ksmbd kstat wrapper + */ +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 & ATTR_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 dentry *dentry, + struct ksmbd_kstat *ksmbd_kstat) +{ + u64 time; + int rc; + + generic_fillattr(&init_user_ns, d_inode(dentry), ksmbd_kstat->kstat); + + 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 = ATTR_DIRECTORY_LE; + else + ksmbd_kstat->file_attributes = ATTR_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(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 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(dentry, name); + break; + } + +out: + ksmbd_vfs_xattr_free(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) +{ + int stream_name_size; + char *xattr_stream_name_buf; + char *type; + int type_len; + + if (s_type == DIR_STREAM) + type = ":$INDEX_ALLOCATION"; + else + type = ":$DATA"; + + type_len = strlen(type); + stream_name_size = strlen(stream_name); + *xattr_stream_name_size = stream_name_size + XATTR_NAME_STREAM_LEN + 1; + xattr_stream_name_buf = kmalloc(*xattr_stream_name_size + type_len, + GFP_KERNEL); + if (!xattr_stream_name_buf) + return -ENOMEM; + + memcpy(xattr_stream_name_buf, + XATTR_NAME_STREAM, + XATTR_NAME_STREAM_LEN); + + if (stream_name_size) { + memcpy(&xattr_stream_name_buf[XATTR_NAME_STREAM_LEN], + stream_name, + stream_name_size); + } + memcpy(&xattr_stream_name_buf[*xattr_stream_name_size - 1], type, type_len); + *xattr_stream_name_size += type_len; + + xattr_stream_name_buf[*xattr_stream_name_size - 1] = '\0'; + *xattr_stream_name = xattr_stream_name_buf; + + return 0; +} + +static int ksmbd_vfs_copy_file_range(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + size_t len) +{ + struct inode *inode_in = file_inode(file_in); + struct inode *inode_out = file_inode(file_out); + int ret; + + ret = vfs_copy_file_range(file_in, pos_in, file_out, pos_out, len, 0); + /* do splice for the copy between different file systems */ + if (ret != -EXDEV) + return ret; + + if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode)) + return -EISDIR; + if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode)) + return -EINVAL; + + if (!(file_in->f_mode & FMODE_READ) || + !(file_out->f_mode & FMODE_WRITE)) + return -EBADF; + + if (len == 0) + return 0; + + file_start_write(file_out); + + /* + * skip the verification of the range of data. it will be done + * in do_splice_direct + */ + ret = do_splice_direct(file_in, &pos_in, file_out, &pos_out, + len > MAX_RW_COUNT ? MAX_RW_COUNT : len, 0); + if (ret > 0) { + fsnotify_access(file_in); + add_rchar(current, ret); + fsnotify_modify(file_out); + add_wchar(current, ret); + } + + inc_syscr(current); + inc_syscw(current); + + file_end_write(file_out); + return ret; +} + +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))) { + ksmbd_err("no right to read(%s)\n", FP_FILENAME(src_fp)); + return -EACCES; + } + if (!(dst_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE))) { + ksmbd_err("no right to write(%s)\n", FP_FILENAME(dst_fp)); + return -EACCES; + } + + if (ksmbd_stream_fd(src_fp) || ksmbd_stream_fd(dst_fp)) + return -EBADF; + + smb_break_all_levII_oplock(work, dst_fp, 1); + + 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 = ksmbd_vfs_copy_file_range(src_fp->filp, src_off, + dst_fp->filp, dst_off, len); + if (ret < 0) + return ret; + + *chunk_count_written += 1; + *total_size_written += ret; + } + return 0; +} + +int ksmbd_vfs_posix_lock_wait(struct file_lock *flock) +{ + return wait_event_interruptible(flock->fl_wait, !flock->fl_blocker); +} + +int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout) +{ + return wait_event_interruptible_timeout(flock->fl_wait, + !flock->fl_blocker, + timeout); +} + +void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock) +{ + locks_delete_block(flock); +} + +int ksmbd_vfs_set_init_posix_acl(struct inode *inode) +{ + struct posix_acl_state acl_state; + struct posix_acl *acls; + int rc; + + 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 = ksmbd_vfs_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 = ksmbd_vfs_set_posix_acl(inode, 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 = ksmbd_vfs_set_posix_acl(inode, 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 inode *inode, struct inode *parent_inode) +{ + struct posix_acl *acls; + struct posix_acl_entry *pace; + int rc, i; + + acls = ksmbd_vfs_get_acl(parent_inode, ACL_TYPE_DEFAULT); + if (!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 = ksmbd_vfs_set_posix_acl(inode, 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 = ksmbd_vfs_set_posix_acl(inode, 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; +} diff --git a/fs/cifsd/vfs.h b/fs/cifsd/vfs.h new file mode 100644 index 000000000000..bbef5c20c146 --- /dev/null +++ b/fs/cifsd/vfs.h @@ -0,0 +1,314 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> + * Copyright (C) 2018 Samsung Electronics Co., Ltd. + */ + +#ifndef __KSMBD_VFS_H__ +#define __KSMBD_VFS_H__ + +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/namei.h> +#include <uapi/linux/xattr.h> +#include <linux/posix_acl.h> + +#include "smbacl.h" + +/* STREAM XATTR PREFIX */ +#define STREAM_PREFIX "DosStream." +#define STREAM_PREFIX_LEN (sizeof(STREAM_PREFIX) - 1) +#define XATTR_NAME_STREAM (XATTR_USER_PREFIX STREAM_PREFIX) +#define XATTR_NAME_STREAM_LEN (sizeof(XATTR_NAME_STREAM) - 1) + +enum { + XATTR_DOSINFO_ATTRIB = 0x00000001, + XATTR_DOSINFO_EA_SIZE = 0x00000002, + XATTR_DOSINFO_SIZE = 0x00000004, + XATTR_DOSINFO_ALLOC_SIZE = 0x00000008, + XATTR_DOSINFO_CREATE_TIME = 0x00000010, + XATTR_DOSINFO_CHANGE_TIME = 0x00000020, + XATTR_DOSINFO_ITIME = 0x00000040 +}; + +struct xattr_dos_attrib { + __u16 version; + __u32 flags; + __u32 attr; + __u32 ea_size; + __u64 size; + __u64 alloc_size; + __u64 create_time; + __u64 change_time; + __u64 itime; +}; + +/* DOS ATTRIBUITE XATTR PREFIX */ +#define DOS_ATTRIBUTE_PREFIX "DOSATTRIB" +#define DOS_ATTRIBUTE_PREFIX_LEN (sizeof(DOS_ATTRIBUTE_PREFIX) - 1) +#define XATTR_NAME_DOS_ATTRIBUTE \ + (XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) +#define XATTR_NAME_DOS_ATTRIBUTE_LEN \ + (sizeof(XATTR_USER_PREFIX DOS_ATTRIBUTE_PREFIX) - 1) + +#define XATTR_SD_HASH_TYPE_SHA256 0x1 +#define XATTR_SD_HASH_SIZE 64 + +#define SMB_ACL_READ 4 +#define SMB_ACL_WRITE 2 +#define SMB_ACL_EXECUTE 1 + +enum { + SMB_ACL_TAG_INVALID = 0, + SMB_ACL_USER, + SMB_ACL_USER_OBJ, + SMB_ACL_GROUP, + SMB_ACL_GROUP_OBJ, + SMB_ACL_OTHER, + SMB_ACL_MASK +}; + +struct xattr_acl_entry { + int type; + uid_t uid; + gid_t gid; + mode_t perm; +}; + +struct xattr_smb_acl { + int count; + int next; + struct xattr_acl_entry entries[0]; +}; + +struct xattr_ntacl { + __u16 version; + void *sd_buf; + __u32 sd_size; + __u16 hash_type; + __u8 desc[10]; + __u16 desc_len; + __u64 current_time; + __u8 hash[XATTR_SD_HASH_SIZE]; + __u8 posix_acl_hash[XATTR_SD_HASH_SIZE]; +}; + +/* SECURITY DESCRIPTOR XATTR PREFIX */ +#define SD_PREFIX "NTACL" +#define SD_PREFIX_LEN (sizeof(SD_PREFIX) - 1) +#define XATTR_NAME_SD \ + (XATTR_SECURITY_PREFIX SD_PREFIX) +#define XATTR_NAME_SD_LEN \ + (sizeof(XATTR_SECURITY_PREFIX SD_PREFIX) - 1) + + +/* CreateOptions */ +/* Flag is set, it must not be a file , valid for directory only */ +#define FILE_DIRECTORY_FILE_LE cpu_to_le32(0x00000001) +#define FILE_WRITE_THROUGH_LE cpu_to_le32(0x00000002) +#define FILE_SEQUENTIAL_ONLY_LE cpu_to_le32(0x00000004) + +/* Should not buffer on server*/ +#define FILE_NO_INTERMEDIATE_BUFFERING_LE cpu_to_le32(0x00000008) +/* MBZ */ +#define FILE_SYNCHRONOUS_IO_ALERT_LE cpu_to_le32(0x00000010) +/* MBZ */ +#define FILE_SYNCHRONOUS_IO_NONALERT_LE cpu_to_le32(0x00000020) + +/* Flaf must not be set for directory */ +#define FILE_NON_DIRECTORY_FILE_LE cpu_to_le32(0x00000040) + +/* Should be zero */ +#define CREATE_TREE_CONNECTION cpu_to_le32(0x00000080) +#define FILE_COMPLETE_IF_OPLOCKED_LE cpu_to_le32(0x00000100) +#define FILE_NO_EA_KNOWLEDGE_LE cpu_to_le32(0x00000200) +#define FILE_OPEN_REMOTE_INSTANCE cpu_to_le32(0x00000400) + +/** + * Doc says this is obsolete "open for recovery" flag should be zero + * in any case. + */ +#define CREATE_OPEN_FOR_RECOVERY cpu_to_le32(0x00000400) +#define FILE_RANDOM_ACCESS_LE cpu_to_le32(0x00000800) +#define FILE_DELETE_ON_CLOSE_LE cpu_to_le32(0x00001000) +#define FILE_OPEN_BY_FILE_ID_LE cpu_to_le32(0x00002000) +#define FILE_OPEN_FOR_BACKUP_INTENT_LE cpu_to_le32(0x00004000) +#define FILE_NO_COMPRESSION_LE cpu_to_le32(0x00008000) + +/* Should be zero*/ +#define FILE_OPEN_REQUIRING_OPLOCK cpu_to_le32(0x00010000) +#define FILE_DISALLOW_EXCLUSIVE cpu_to_le32(0x00020000) +#define FILE_RESERVE_OPFILTER_LE cpu_to_le32(0x00100000) +#define FILE_OPEN_REPARSE_POINT_LE cpu_to_le32(0x00200000) +#define FILE_OPEN_NO_RECALL_LE cpu_to_le32(0x00400000) + +/* Should be zero */ +#define FILE_OPEN_FOR_FREE_SPACE_QUERY_LE cpu_to_le32(0x00800000) +#define CREATE_OPTIONS_MASK cpu_to_le32(0x00FFFFFF) +#define CREATE_OPTION_READONLY 0x10000000 +/* system. NB not sent over wire */ +#define CREATE_OPTION_SPECIAL 0x20000000 + +struct ksmbd_work; +struct ksmbd_file; +struct ksmbd_conn; + +struct ksmbd_dir_info { + const char *name; + char *wptr; + char *rptr; + int name_len; + int out_buf_len; + int num_entry; + int data_count; + int last_entry_offset; + bool hide_dot_file; + int flags; +}; + +struct ksmbd_readdir_data { + struct dir_context ctx; + union { + void *private; + char *dirent; + }; + + unsigned int used; + unsigned int dirent_count; + unsigned int file_attr; +}; + +/* ksmbd kstat wrapper to get valid create time when reading dir entry */ +struct ksmbd_kstat { + struct kstat *kstat; + unsigned long long create_time; + __le32 file_attributes; +}; + +struct ksmbd_fs_sector_size { + unsigned short logical_sector_size; + unsigned int physical_sector_size; + unsigned int optimal_io_size; +}; + +int ksmbd_vfs_inode_permission(struct dentry *dentry, int acc_mode, + bool delete); +int ksmbd_vfs_query_maximal_access(struct dentry *dentry, __le32 *daccess); +int ksmbd_vfs_create(struct ksmbd_work *work, const char *name, umode_t mode); +int ksmbd_vfs_mkdir(struct ksmbd_work *work, const char *name, umode_t mode); +int ksmbd_vfs_read(struct ksmbd_work *work, struct ksmbd_file *fp, + size_t count, loff_t *pos); +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); +int ksmbd_vfs_fsync(struct ksmbd_work *work, uint64_t fid, uint64_t p_id); +int ksmbd_vfs_remove_file(struct ksmbd_work *work, char *name); +int ksmbd_vfs_link(struct ksmbd_work *work, + const char *oldname, const char *newname); +int ksmbd_vfs_getattr(struct path *path, struct kstat *stat); +int ksmbd_vfs_symlink(const char *name, const char *symname); +int ksmbd_vfs_readlink(struct path *path, char *buf, int lenp); + +int ksmbd_vfs_fp_rename(struct ksmbd_work *work, struct ksmbd_file *fp, + char *newname); +int ksmbd_vfs_rename_slowpath(struct ksmbd_work *work, + char *oldname, char *newname); + +int ksmbd_vfs_truncate(struct ksmbd_work *work, const char *name, + struct ksmbd_file *fp, loff_t size); + +struct srv_copychunk; +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); + +struct ksmbd_file *ksmbd_vfs_dentry_open(struct ksmbd_work *work, + const struct path *path, + int flags, + __le32 option, + int fexist); + +ssize_t ksmbd_vfs_listxattr(struct dentry *dentry, char **list); +ssize_t ksmbd_vfs_getxattr(struct dentry *dentry, + char *xattr_name, + char **xattr_buf); + +ssize_t ksmbd_vfs_casexattr_len(struct dentry *dentry, + char *attr_name, + int attr_name_len); + +int ksmbd_vfs_setxattr(struct dentry *dentry, + const char *attr_name, + const void *attr_value, + size_t attr_size, + int flags); + +int ksmbd_vfs_fsetxattr(const char *filename, + const char *attr_name, + const void *attr_value, + size_t attr_size, + int flags); + +int ksmbd_vfs_xattr_stream_name(char *stream_name, + char **xattr_stream_name, + size_t *xattr_stream_name_size, + int s_type); + +int ksmbd_vfs_truncate_xattr(struct dentry *dentry, int wo_streams); +int ksmbd_vfs_remove_xattr(struct dentry *dentry, char *attr_name); +void ksmbd_vfs_xattr_free(char *xattr); + +int ksmbd_vfs_kern_path(char *name, unsigned int flags, struct path *path, + bool caseless); +int ksmbd_vfs_empty_dir(struct ksmbd_file *fp); +void ksmbd_vfs_set_fadvise(struct file *filp, __le32 option); +int ksmbd_vfs_lock(struct file *filp, int cmd, struct file_lock *flock); +int ksmbd_vfs_readdir(struct file *file, struct ksmbd_readdir_data *rdata); +int ksmbd_vfs_alloc_size(struct ksmbd_work *work, + struct ksmbd_file *fp, + loff_t len); +int ksmbd_vfs_zero_data(struct ksmbd_work *work, + struct ksmbd_file *fp, + loff_t off, + loff_t len); + +struct file_allocated_range_buffer; +int ksmbd_vfs_fqar_lseek(struct ksmbd_file *fp, loff_t start, loff_t length, + struct file_allocated_range_buffer *ranges, + int in_count, int *out_count); +int ksmbd_vfs_unlink(struct dentry *dir, struct dentry *dentry); +unsigned short ksmbd_vfs_logical_sector_size(struct inode *inode); +void ksmbd_vfs_smb2_sector_size(struct inode *inode, + struct ksmbd_fs_sector_size *fs_ss); +void *ksmbd_vfs_init_kstat(char **p, struct ksmbd_kstat *ksmbd_kstat); + +int ksmbd_vfs_fill_dentry_attrs(struct ksmbd_work *work, + struct dentry *dentry, + struct ksmbd_kstat *ksmbd_kstat); + +int ksmbd_vfs_posix_lock_wait(struct file_lock *flock); +int ksmbd_vfs_posix_lock_wait_timeout(struct file_lock *flock, long timeout); +void ksmbd_vfs_posix_lock_unblock(struct file_lock *flock); + +int ksmbd_vfs_remove_acl_xattrs(struct dentry *dentry); +int ksmbd_vfs_remove_sd_xattrs(struct dentry *dentry); +int ksmbd_vfs_set_sd_xattr(struct ksmbd_conn *conn, struct dentry *dentry, + struct smb_ntsd *pntsd, int len); +int ksmbd_vfs_get_sd_xattr(struct ksmbd_conn *conn, struct dentry *dentry, + struct smb_ntsd **pntsd); +int ksmbd_vfs_set_dos_attrib_xattr(struct dentry *dentry, + struct xattr_dos_attrib *da); +int ksmbd_vfs_get_dos_attrib_xattr(struct dentry *dentry, + struct xattr_dos_attrib *da); +struct posix_acl *ksmbd_vfs_posix_acl_alloc(int count, gfp_t flags); +struct posix_acl *ksmbd_vfs_get_acl(struct inode *inode, int type); +int ksmbd_vfs_set_posix_acl(struct inode *inode, int type, + struct posix_acl *acl); +int ksmbd_vfs_set_init_posix_acl(struct inode *inode); +int ksmbd_vfs_inherit_posix_acl(struct inode *inode, + struct inode *parent_inode); +#endif /* __KSMBD_VFS_H__ */ diff --git a/fs/cifsd/vfs_cache.c b/fs/cifsd/vfs_cache.c new file mode 100644 index 000000000000..8d8c4e373308 --- /dev/null +++ b/fs/cifsd/vfs_cache.c @@ -0,0 +1,855 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org> + * Copyright (C) 2019 Samsung Electronics Co., Ltd. + */ + +#include <linux/fs.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> + +/* @FIXME */ +#include "glob.h" +#include "vfs_cache.h" +#include "buffer_pool.h" + +#include "oplock.h" +#include "vfs.h" +#include "connection.h" +#include "mgmt/tree_connect.h" +#include "mgmt/user_session.h" + +/* @FIXME */ +#include "smb_common.h" + +#define S_DEL_PENDING 1 +#define S_DEL_ON_CLS 2 +#define S_DEL_ON_CLS_STREAM 8 + +static unsigned int inode_hash_mask __read_mostly; +static unsigned int inode_hash_shift __read_mostly; +static struct hlist_head *inode_hashtable __read_mostly; +static DEFINE_RWLOCK(inode_hash_lock); + +static struct ksmbd_file_table global_ft; +static atomic_long_t fd_limit; + +void ksmbd_set_fd_limit(unsigned long limit) +{ + limit = min(limit, get_max_files()); + atomic_long_set(&fd_limit, limit); +} + +static bool fd_limit_depleted(void) +{ + long v = atomic_long_dec_return(&fd_limit); + + if (v >= 0) + return false; + atomic_long_inc(&fd_limit); + return true; +} + +static void fd_limit_close(void) +{ + atomic_long_inc(&fd_limit); +} + +/* + * INODE hash + */ + +static unsigned long inode_hash(struct super_block *sb, unsigned long hashval) +{ + unsigned long tmp; + + tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / + L1_CACHE_BYTES; + tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> inode_hash_shift); + return tmp & inode_hash_mask; +} + +static struct ksmbd_inode *__ksmbd_inode_lookup(struct inode *inode) +{ + struct hlist_head *head = inode_hashtable + + inode_hash(inode->i_sb, inode->i_ino); + struct ksmbd_inode *ci = NULL, *ret_ci = NULL; + + hlist_for_each_entry(ci, head, m_hash) { + if (ci->m_inode == inode) { + if (atomic_inc_not_zero(&ci->m_count)) + ret_ci = ci; + break; + } + } + return ret_ci; +} + +static struct ksmbd_inode *ksmbd_inode_lookup(struct ksmbd_file *fp) +{ + return __ksmbd_inode_lookup(FP_INODE(fp)); +} + +static struct ksmbd_inode *ksmbd_inode_lookup_by_vfsinode(struct inode *inode) +{ + struct ksmbd_inode *ci; + + read_lock(&inode_hash_lock); + ci = __ksmbd_inode_lookup(inode); + read_unlock(&inode_hash_lock); + return ci; +} + +int ksmbd_query_inode_status(struct inode *inode) +{ + struct ksmbd_inode *ci; + int ret = KSMBD_INODE_STATUS_UNKNOWN; + + read_lock(&inode_hash_lock); + ci = __ksmbd_inode_lookup(inode); + if (ci) { + ret = KSMBD_INODE_STATUS_OK; + if (ci->m_flags & S_DEL_PENDING) + ret = KSMBD_INODE_STATUS_PENDING_DELETE; + atomic_dec(&ci->m_count); + } + read_unlock(&inode_hash_lock); + return ret; +} + +bool ksmbd_inode_pending_delete(struct ksmbd_file *fp) +{ + return (fp->f_ci->m_flags & S_DEL_PENDING); +} + +void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp) +{ + fp->f_ci->m_flags |= S_DEL_PENDING; +} + +void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp) +{ + fp->f_ci->m_flags &= ~S_DEL_PENDING; +} + +void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp, + int file_info) +{ + if (ksmbd_stream_fd(fp)) { + fp->f_ci->m_flags |= S_DEL_ON_CLS_STREAM; + return; + } + + fp->f_ci->m_flags |= S_DEL_ON_CLS; +} + +static void ksmbd_inode_hash(struct ksmbd_inode *ci) +{ + struct hlist_head *b = inode_hashtable + + inode_hash(ci->m_inode->i_sb, ci->m_inode->i_ino); + + hlist_add_head(&ci->m_hash, b); +} + +static void ksmbd_inode_unhash(struct ksmbd_inode *ci) +{ + write_lock(&inode_hash_lock); + hlist_del_init(&ci->m_hash); + write_unlock(&inode_hash_lock); +} + +static int ksmbd_inode_init(struct ksmbd_inode *ci, struct ksmbd_file *fp) +{ + ci->m_inode = FP_INODE(fp); + atomic_set(&ci->m_count, 1); + atomic_set(&ci->op_count, 0); + atomic_set(&ci->sop_count, 0); + ci->m_flags = 0; + ci->m_fattr = 0; + INIT_LIST_HEAD(&ci->m_fp_list); + INIT_LIST_HEAD(&ci->m_op_list); + rwlock_init(&ci->m_lock); + return 0; +} + +static struct ksmbd_inode *ksmbd_inode_get(struct ksmbd_file *fp) +{ + struct ksmbd_inode *ci, *tmpci; + int rc; + + read_lock(&inode_hash_lock); + ci = ksmbd_inode_lookup(fp); + read_unlock(&inode_hash_lock); + if (ci) + return ci; + + ci = kmalloc(sizeof(struct ksmbd_inode), GFP_KERNEL); + if (!ci) + return NULL; + + rc = ksmbd_inode_init(ci, fp); + if (rc) { + ksmbd_err("inode initialized failed\n"); + kfree(ci); + return NULL; + } + + write_lock(&inode_hash_lock); + tmpci = ksmbd_inode_lookup(fp); + if (!tmpci) { + ksmbd_inode_hash(ci); + } else { + kfree(ci); + ci = tmpci; + } + write_unlock(&inode_hash_lock); + return ci; +} + +static void ksmbd_inode_free(struct ksmbd_inode *ci) +{ + ksmbd_inode_unhash(ci); + kfree(ci); +} + +static void ksmbd_inode_put(struct ksmbd_inode *ci) +{ + if (atomic_dec_and_test(&ci->m_count)) + ksmbd_inode_free(ci); +} + +int __init ksmbd_inode_hash_init(void) +{ + unsigned int loop; + unsigned long numentries = 16384; + unsigned long bucketsize = sizeof(struct hlist_head); + unsigned long size; + + inode_hash_shift = ilog2(numentries); + inode_hash_mask = (1 << inode_hash_shift) - 1; + + size = bucketsize << inode_hash_shift; + + /* init master fp hash table */ + inode_hashtable = vmalloc(size); + if (!inode_hashtable) + return -ENOMEM; + + for (loop = 0; loop < (1U << inode_hash_shift); loop++) + INIT_HLIST_HEAD(&inode_hashtable[loop]); + return 0; +} + +void __exit ksmbd_release_inode_hash(void) +{ + vfree(inode_hashtable); +} + +static void __ksmbd_inode_close(struct ksmbd_file *fp) +{ + struct dentry *dir, *dentry; + struct ksmbd_inode *ci = fp->f_ci; + int err; + struct file *filp; + + filp = fp->filp; + if (ksmbd_stream_fd(fp) && (ci->m_flags & S_DEL_ON_CLS_STREAM)) { + ci->m_flags &= ~S_DEL_ON_CLS_STREAM; + err = ksmbd_vfs_remove_xattr(filp->f_path.dentry, + fp->stream.name); + if (err) + ksmbd_err("remove xattr failed : %s\n", + fp->stream.name); + } + + if (atomic_dec_and_test(&ci->m_count)) { + write_lock(&ci->m_lock); + if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) { + dentry = filp->f_path.dentry; + dir = dentry->d_parent; + ci->m_flags &= ~(S_DEL_ON_CLS | S_DEL_PENDING); + write_unlock(&ci->m_lock); + ksmbd_vfs_unlink(dir, dentry); + write_lock(&ci->m_lock); + } + write_unlock(&ci->m_lock); + + ksmbd_inode_free(ci); + } +} + +static void __ksmbd_remove_durable_fd(struct ksmbd_file *fp) +{ + if (!HAS_FILE_ID(fp->persistent_id)) + return; + + write_lock(&global_ft.lock); + idr_remove(global_ft.idr, fp->persistent_id); + write_unlock(&global_ft.lock); +} + +static void __ksmbd_remove_fd(struct ksmbd_file_table *ft, + struct ksmbd_file *fp) +{ + if (!HAS_FILE_ID(fp->volatile_id)) + return; + + write_lock(&fp->f_ci->m_lock); + list_del_init(&fp->node); + write_unlock(&fp->f_ci->m_lock); + + write_lock(&ft->lock); + idr_remove(ft->idr, fp->volatile_id); + write_unlock(&ft->lock); +} + +static void __ksmbd_close_fd(struct ksmbd_file_table *ft, + struct ksmbd_file *fp) +{ + struct file *filp; + + fd_limit_close(); + __ksmbd_remove_durable_fd(fp); + __ksmbd_remove_fd(ft, fp); + + close_id_del_oplock(fp); + filp = fp->filp; + + __ksmbd_inode_close(fp); + if (!IS_ERR_OR_NULL(filp)) + fput(filp); + kfree(fp->filename); + if (ksmbd_stream_fd(fp)) + kfree(fp->stream.name); + ksmbd_free_file_struct(fp); +} + +static struct ksmbd_file *ksmbd_fp_get(struct ksmbd_file *fp) +{ + if (!atomic_inc_not_zero(&fp->refcount)) + return NULL; + return fp; +} + +static struct ksmbd_file *__ksmbd_lookup_fd(struct ksmbd_file_table *ft, + unsigned int id) +{ + bool unclaimed = true; + struct ksmbd_file *fp; + + read_lock(&ft->lock); + fp = idr_find(ft->idr, id); + if (fp) + fp = ksmbd_fp_get(fp); + + if (fp && fp->f_ci) { + read_lock(&fp->f_ci->m_lock); + unclaimed = list_empty(&fp->node); + read_unlock(&fp->f_ci->m_lock); + } + read_unlock(&ft->lock); + + if (fp && unclaimed) { + atomic_dec(&fp->refcount); + return NULL; + } + return fp; +} + +static void __put_fd_final(struct ksmbd_work *work, + struct ksmbd_file *fp) +{ + __ksmbd_close_fd(&work->sess->file_table, fp); + atomic_dec(&work->conn->stats.open_files_count); +} + +static void set_close_state_blocked_works(struct ksmbd_file *fp) +{ + struct ksmbd_work *cancel_work, *ctmp; + + spin_lock(&fp->f_lock); + list_for_each_entry_safe(cancel_work, ctmp, &fp->blocked_works, + fp_entry) { + list_del(&cancel_work->fp_entry); + cancel_work->state = KSMBD_WORK_CLOSED; + cancel_work->cancel_fn(cancel_work->cancel_argv); + } + spin_unlock(&fp->f_lock); +} + +int ksmbd_close_fd(struct ksmbd_work *work, unsigned int id) +{ + struct ksmbd_file *fp; + struct ksmbd_file_table *ft; + + if (!HAS_FILE_ID(id)) + return 0; + + ft = &work->sess->file_table; + read_lock(&ft->lock); + fp = idr_find(ft->idr, id); + if (fp) { + set_close_state_blocked_works(fp); + + if (!atomic_dec_and_test(&fp->refcount)) + fp = NULL; + } + read_unlock(&ft->lock); + + if (!fp) + return -EINVAL; + + __put_fd_final(work, fp); + return 0; +} + +void ksmbd_fd_put(struct ksmbd_work *work, + struct ksmbd_file *fp) +{ + if (!fp) + return; + + if (!atomic_dec_and_test(&fp->refcount)) + return; + __put_fd_final(work, fp); +} + +static bool __sanity_check(struct ksmbd_tree_connect *tcon, + struct ksmbd_file *fp) +{ + if (!fp) + return false; + if (fp->tcon != tcon) + return false; + return true; +} + +struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, + unsigned int id) +{ + return __ksmbd_lookup_fd(&work->sess->file_table, id); +} + +struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work, + unsigned int id) +{ + struct ksmbd_file *fp = __ksmbd_lookup_fd(&work->sess->file_table, id); + + if (__sanity_check(work->tcon, fp)) + return fp; + + ksmbd_fd_put(work, fp); + return NULL; +} + +struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, + unsigned int id, + unsigned int pid) +{ + struct ksmbd_file *fp; + + if (!HAS_FILE_ID(id)) { + id = work->compound_fid; + pid = work->compound_pfid; + } + + if (!HAS_FILE_ID(id)) + return NULL; + + fp = __ksmbd_lookup_fd(&work->sess->file_table, id); + if (!__sanity_check(work->tcon, fp)) { + ksmbd_fd_put(work, fp); + return NULL; + } + if (fp->persistent_id != pid) { + ksmbd_fd_put(work, fp); + return NULL; + } + return fp; +} + +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) +{ + return __ksmbd_lookup_fd(&global_ft, id); +} + +int ksmbd_close_fd_app_id(struct ksmbd_work *work, + char *app_id) +{ + struct ksmbd_file *fp = NULL; + unsigned int id; + + read_lock(&global_ft.lock); + idr_for_each_entry(global_ft.idr, fp, id) { + if (!memcmp(fp->app_instance_id, + app_id, + SMB2_CREATE_GUID_SIZE)) { + if (!atomic_dec_and_test(&fp->refcount)) + fp = NULL; + break; + } + } + read_unlock(&global_ft.lock); + + if (!fp) + return -EINVAL; + + __put_fd_final(work, fp); + return 0; +} + +struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid) +{ + struct ksmbd_file *fp = NULL; + unsigned int id; + + read_lock(&global_ft.lock); + idr_for_each_entry(global_ft.idr, fp, id) { + if (!memcmp(fp->create_guid, + cguid, + SMB2_CREATE_GUID_SIZE)) { + fp = ksmbd_fp_get(fp); + break; + } + } + read_unlock(&global_ft.lock); + + return fp; +} + +struct ksmbd_file *ksmbd_lookup_fd_filename(struct ksmbd_work *work, + char *filename) +{ + struct ksmbd_file *fp = NULL; + unsigned int id; + + read_lock(&work->sess->file_table.lock); + idr_for_each_entry(work->sess->file_table.idr, fp, id) { + if (!strcmp(fp->filename, filename)) { + fp = ksmbd_fp_get(fp); + break; + } + } + read_unlock(&work->sess->file_table.lock); + + return fp; +} + +struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode) +{ + struct ksmbd_file *lfp; + struct ksmbd_inode *ci; + struct list_head *cur; + + ci = ksmbd_inode_lookup_by_vfsinode(inode); + if (!ci) + return NULL; + + read_lock(&ci->m_lock); + list_for_each(cur, &ci->m_fp_list) { + lfp = list_entry(cur, struct ksmbd_file, node); + if (inode == FP_INODE(lfp)) { + atomic_dec(&ci->m_count); + read_unlock(&ci->m_lock); + return lfp; + } + } + atomic_dec(&ci->m_count); + read_unlock(&ci->m_lock); + return NULL; +} + +#define OPEN_ID_TYPE_VOLATILE_ID (0) +#define OPEN_ID_TYPE_PERSISTENT_ID (1) + +static void __open_id_set(struct ksmbd_file *fp, unsigned int id, int type) +{ + if (type == OPEN_ID_TYPE_VOLATILE_ID) + fp->volatile_id = id; + if (type == OPEN_ID_TYPE_PERSISTENT_ID) + fp->persistent_id = id; +} + +static int __open_id(struct ksmbd_file_table *ft, + struct ksmbd_file *fp, + int type) +{ + unsigned int id = 0; + int ret; + + if (type == OPEN_ID_TYPE_VOLATILE_ID && fd_limit_depleted()) { + __open_id_set(fp, KSMBD_NO_FID, type); + return -EMFILE; + } + + idr_preload(GFP_KERNEL); + write_lock(&ft->lock); + ret = idr_alloc_cyclic(ft->idr, fp, 0, INT_MAX, GFP_NOWAIT); + if (ret >= 0) { + id = ret; + ret = 0; + } else { + id = KSMBD_NO_FID; + fd_limit_close(); + } + + __open_id_set(fp, id, type); + write_unlock(&ft->lock); + idr_preload_end(); + return ret; +} + +unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp) +{ + __open_id(&global_ft, fp, OPEN_ID_TYPE_PERSISTENT_ID); + return fp->persistent_id; +} + +struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work, + struct file *filp) +{ + struct ksmbd_file *fp; + int ret; + + fp = ksmbd_alloc_file_struct(); + if (!fp) { + ksmbd_err("Failed to allocate memory\n"); + return ERR_PTR(-ENOMEM); + } + + INIT_LIST_HEAD(&fp->blocked_works); + INIT_LIST_HEAD(&fp->node); + spin_lock_init(&fp->f_lock); + atomic_set(&fp->refcount, 1); + + fp->filp = filp; + fp->conn = work->sess->conn; + fp->tcon = work->tcon; + fp->volatile_id = KSMBD_NO_FID; + fp->persistent_id = KSMBD_NO_FID; + fp->f_ci = ksmbd_inode_get(fp); + + if (!fp->f_ci) { + ksmbd_free_file_struct(fp); + return ERR_PTR(-ENOMEM); + } + + ret = __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); + if (ret) { + ksmbd_inode_put(fp->f_ci); + ksmbd_free_file_struct(fp); + return ERR_PTR(ret); + } + + atomic_inc(&work->conn->stats.open_files_count); + return fp; +} + +static inline bool is_reconnectable(struct ksmbd_file *fp) +{ + struct oplock_info *opinfo = opinfo_get(fp); + bool reconn = false; + + if (!opinfo) + return false; + + if (opinfo->op_state != OPLOCK_STATE_NONE) { + opinfo_put(opinfo); + return false; + } + + if (fp->is_resilient || fp->is_persistent) + reconn = true; + else if (fp->is_durable && opinfo->is_lease && + opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE) + reconn = true; + + else if (fp->is_durable && opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) + reconn = true; + + opinfo_put(opinfo); + return reconn; +} + +static int +__close_file_table_ids(struct ksmbd_file_table *ft, + struct ksmbd_tree_connect *tcon, + bool (*skip)(struct ksmbd_tree_connect *tcon, + struct ksmbd_file *fp)) +{ + unsigned int id; + struct ksmbd_file *fp; + int num = 0; + + idr_for_each_entry(ft->idr, fp, id) { + if (skip(tcon, fp)) + continue; + + set_close_state_blocked_works(fp); + + if (!atomic_dec_and_test(&fp->refcount)) + continue; + __ksmbd_close_fd(ft, fp); + num++; + } + return num; +} + +static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, + struct ksmbd_file *fp) +{ + return fp->tcon != tcon; +} + +static bool session_fd_check(struct ksmbd_tree_connect *tcon, + struct ksmbd_file *fp) +{ + if (!is_reconnectable(fp)) + return false; + + fp->conn = NULL; + fp->tcon = NULL; + fp->volatile_id = KSMBD_NO_FID; + return true; +} + +void ksmbd_close_tree_conn_fds(struct ksmbd_work *work) +{ + int num = __close_file_table_ids(&work->sess->file_table, + work->tcon, + tree_conn_fd_check); + + atomic_sub(num, &work->conn->stats.open_files_count); +} + +void ksmbd_close_session_fds(struct ksmbd_work *work) +{ + int num = __close_file_table_ids(&work->sess->file_table, + work->tcon, + session_fd_check); + + atomic_sub(num, &work->conn->stats.open_files_count); +} + +int ksmbd_init_global_file_table(void) +{ + return ksmbd_init_file_table(&global_ft); +} + +void ksmbd_free_global_file_table(void) +{ + struct ksmbd_file *fp = NULL; + unsigned int id; + + idr_for_each_entry(global_ft.idr, fp, id) { + __ksmbd_remove_durable_fd(fp); + ksmbd_free_file_struct(fp); + } + + ksmbd_destroy_file_table(&global_ft); +} + +int ksmbd_reopen_durable_fd(struct ksmbd_work *work, + struct ksmbd_file *fp) +{ + if (!fp->is_durable || fp->conn || fp->tcon) { + ksmbd_err("Invalid durable fd [%p:%p]\n", + fp->conn, fp->tcon); + return -EBADF; + } + + if (HAS_FILE_ID(fp->volatile_id)) { + ksmbd_err("Still in use durable fd: %u\n", fp->volatile_id); + return -EBADF; + } + + fp->conn = work->sess->conn; + fp->tcon = work->tcon; + + __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); + if (!HAS_FILE_ID(fp->volatile_id)) { + fp->conn = NULL; + fp->tcon = NULL; + return -EBADF; + } + return 0; +} + +static void close_fd_list(struct ksmbd_work *work, struct list_head *head) +{ + while (!list_empty(head)) { + struct ksmbd_file *fp; + + fp = list_first_entry(head, struct ksmbd_file, node); + list_del_init(&fp->node); + + __ksmbd_close_fd(&work->sess->file_table, fp); + } +} + +int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode *inode) +{ + struct ksmbd_inode *ci; + bool unlinked = true; + struct ksmbd_file *fp, *fptmp; + LIST_HEAD(dispose); + + ci = ksmbd_inode_lookup_by_vfsinode(inode); + if (!ci) + return true; + + if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) + unlinked = false; + + write_lock(&ci->m_lock); + list_for_each_entry_safe(fp, fptmp, &ci->m_fp_list, node) { + if (fp->conn) + continue; + + list_del(&fp->node); + list_add(&fp->node, &dispose); + } + atomic_dec(&ci->m_count); + write_unlock(&ci->m_lock); + + close_fd_list(work, &dispose); + return unlinked; +} + +int ksmbd_file_table_flush(struct ksmbd_work *work) +{ + struct ksmbd_file *fp = NULL; + unsigned int id; + int ret; + + read_lock(&work->sess->file_table.lock); + idr_for_each_entry(work->sess->file_table.idr, fp, id) { + ret = ksmbd_vfs_fsync(work, fp->volatile_id, KSMBD_NO_FID); + if (ret) + break; + } + read_unlock(&work->sess->file_table.lock); + return ret; +} + +int ksmbd_init_file_table(struct ksmbd_file_table *ft) +{ + ft->idr = ksmbd_alloc(sizeof(struct idr)); + if (!ft->idr) + return -ENOMEM; + + idr_init(ft->idr); + rwlock_init(&ft->lock); + return 0; +} + +void ksmbd_destroy_file_table(struct ksmbd_file_table *ft) +{ + if (!ft->idr) + return; + + __close_file_table_ids(ft, NULL, session_fd_check); + idr_destroy(ft->idr); + ksmbd_free(ft->idr); + ft->idr = NULL; +} diff --git a/fs/cifsd/vfs_cache.h b/fs/cifsd/vfs_cache.h new file mode 100644 index 000000000000..7d23657c86c6 --- /dev/null +++ b/fs/cifsd/vfs_cache.h @@ -0,0 +1,213 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * Copyright (C) 2019 Samsung Electronics Co., Ltd. + */ + +#ifndef __VFS_CACHE_H__ +#define __VFS_CACHE_H__ + +#include <linux/version.h> +#include <linux/file.h> +#include <linux/fs.h> +#include <linux/rwsem.h> +#include <linux/spinlock.h> +#include <linux/idr.h> +#include <linux/workqueue.h> + +#include "vfs.h" + +/* Windows style file permissions for extended response */ +#define FILE_GENERIC_ALL 0x1F01FF +#define FILE_GENERIC_READ 0x120089 +#define FILE_GENERIC_WRITE 0x120116 +#define FILE_GENERIC_EXECUTE 0X1200a0 + +#define KSMBD_START_FID 0 +#define KSMBD_NO_FID (UINT_MAX) +#define SMB2_NO_FID (0xFFFFFFFFFFFFFFFFULL) + +#define FP_FILENAME(fp) fp->filp->f_path.dentry->d_name.name +#define FP_INODE(fp) fp->filp->f_path.dentry->d_inode +#define PARENT_INODE(fp) fp->filp->f_path.dentry->d_parent->d_inode + +#define ATTR_FP(fp) (fp->attrib_only && \ + (fp->cdoption != FILE_OVERWRITE_IF_LE && \ + fp->cdoption != FILE_OVERWRITE_LE && \ + fp->cdoption != FILE_SUPERSEDE_LE)) + +struct ksmbd_conn; +struct ksmbd_session; + +struct ksmbd_lock { + struct file_lock *fl; + struct list_head glist; + struct list_head llist; + unsigned int flags; + int cmd; + int zero_len; + unsigned long long start; + unsigned long long end; +}; + +struct stream { + char *name; + ssize_t size; +}; + +struct ksmbd_inode { + rwlock_t m_lock; + atomic_t m_count; + atomic_t op_count; + /* opinfo count for streams */ + atomic_t sop_count; + struct inode *m_inode; + unsigned int m_flags; + struct hlist_node m_hash; + struct list_head m_fp_list; + struct list_head m_op_list; + struct oplock_info *m_opinfo; + __le32 m_fattr; +}; + +struct ksmbd_file { + struct file *filp; + char *filename; + unsigned int persistent_id; + unsigned int volatile_id; + + spinlock_t f_lock; + + struct ksmbd_inode *f_ci; + struct ksmbd_inode *f_parent_ci; + struct oplock_info __rcu *f_opinfo; + struct ksmbd_conn *conn; + struct ksmbd_tree_connect *tcon; + + atomic_t refcount; + __le32 daccess; + __le32 saccess; + __le32 coption; + __le32 cdoption; + __u64 create_time; + __u64 itime; + + bool is_durable; + bool is_resilient; + bool is_persistent; + bool is_nt_open; + bool attrib_only; + + char client_guid[16]; + char create_guid[16]; + char app_instance_id[16]; + + struct stream stream; + struct list_head node; + struct list_head blocked_works; + + int durable_timeout; + + /* for SMB1 */ + int pid; + + /* conflict lock fail count for SMB1 */ + unsigned int cflock_cnt; + /* last lock failure start offset for SMB1 */ + unsigned long long llock_fstart; + + int dirent_offset; + + /* if ls is happening on directory, below is valid*/ + struct ksmbd_readdir_data readdir_data; + int dot_dotdot[2]; +}; + +static inline void set_ctx_actor(struct dir_context *ctx, + filldir_t actor) +{ + ctx->actor = actor; +} + +#define KSMBD_NR_OPEN_DEFAULT BITS_PER_LONG + +struct ksmbd_file_table { + rwlock_t lock; + struct idr *idr; +}; + +static inline bool HAS_FILE_ID(unsigned long long req) +{ + unsigned int id = (unsigned int)req; + + return id < KSMBD_NO_FID; +} + +static inline bool ksmbd_stream_fd(struct ksmbd_file *fp) +{ + return fp->stream.name != NULL; +} + +int ksmbd_init_file_table(struct ksmbd_file_table *ft); +void ksmbd_destroy_file_table(struct ksmbd_file_table *ft); + +int ksmbd_close_fd(struct ksmbd_work *work, unsigned int id); + +struct ksmbd_file *ksmbd_lookup_fd_fast(struct ksmbd_work *work, + unsigned int id); +struct ksmbd_file *ksmbd_lookup_foreign_fd(struct ksmbd_work *work, + unsigned int id); +struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, + unsigned int id, + unsigned int pid); + +void ksmbd_fd_put(struct ksmbd_work *work, struct ksmbd_file *fp); + +int ksmbd_close_fd_app_id(struct ksmbd_work *work, char *app_id); +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id); +struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid); +struct ksmbd_file *ksmbd_lookup_fd_filename(struct ksmbd_work *work, + char *filename); +struct ksmbd_file *ksmbd_lookup_fd_inode(struct inode *inode); + +unsigned int ksmbd_open_durable_fd(struct ksmbd_file *fp); + +struct ksmbd_file *ksmbd_open_fd(struct ksmbd_work *work, + struct file *filp); + +void ksmbd_close_tree_conn_fds(struct ksmbd_work *work); +void ksmbd_close_session_fds(struct ksmbd_work *work); + +int ksmbd_close_inode_fds(struct ksmbd_work *work, struct inode *inode); + +int ksmbd_reopen_durable_fd(struct ksmbd_work *work, + struct ksmbd_file *fp); + +int ksmbd_init_global_file_table(void); +void ksmbd_free_global_file_table(void); + +int ksmbd_file_table_flush(struct ksmbd_work *work); + +void ksmbd_set_fd_limit(unsigned long limit); + +/* + * INODE hash + */ + +int __init ksmbd_inode_hash_init(void); +void __exit ksmbd_release_inode_hash(void); + +enum KSMBD_INODE_STATUS { + KSMBD_INODE_STATUS_OK, + KSMBD_INODE_STATUS_UNKNOWN, + KSMBD_INODE_STATUS_PENDING_DELETE, +}; + +int ksmbd_query_inode_status(struct inode *inode); + +bool ksmbd_inode_pending_delete(struct ksmbd_file *fp); +void ksmbd_set_inode_pending_delete(struct ksmbd_file *fp); +void ksmbd_clear_inode_pending_delete(struct ksmbd_file *fp); + +void ksmbd_fd_set_delete_on_close(struct ksmbd_file *fp, + int file_info); +#endif /* __VFS_CACHE_H__ */ |