linux/fs/smb/client/inode.c

// SPDX-License-Identifier: LGPL-2.1
/*
 *
 *   Copyright (C) International Business Machines  Corp., 2002,2010
 *   Author(s): Steve French ([email protected])
 *
 */
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/freezer.h>
#include <linux/sched/signal.h>
#include <linux/wait_bit.h>
#include <linux/fiemap.h>
#include <asm/div64.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "cifs_unicode.h"
#include "fscache.h"
#include "fs_context.h"
#include "cifs_ioctl.h"
#include "cached_dir.h"
#include "reparse.h"

/*
 * Set parameters for the netfs library
 */
static void cifs_set_netfs_context(struct inode *inode)
{ … }

static void cifs_set_ops(struct inode *inode)
{ … }

/* check inode attributes against fattr. If they don't match, tag the
 * inode for cache invalidation
 */
static void
cifs_revalidate_cache(struct inode *inode, struct cifs_fattr *fattr)
{ … }

/*
 * copy nlink to the inode, unless it wasn't provided.  Provide
 * sane values if we don't have an existing one and none was provided
 */
static void
cifs_nlink_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
{ … }

/* populate an inode with info from a cifs_fattr struct */
int
cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr,
		    bool from_readdir)
{ … }

void
cifs_fill_uniqueid(struct super_block *sb, struct cifs_fattr *fattr)
{ … }

/* Fill a cifs_fattr struct with info from FILE_UNIX_BASIC_INFO. */
void
cifs_unix_basic_to_fattr(struct cifs_fattr *fattr, FILE_UNIX_BASIC_INFO *info,
			 struct cifs_sb_info *cifs_sb)
{ … }

/*
 * Fill a cifs_fattr struct with fake inode info.
 *
 * Needed to setup cifs_fattr data for the directory which is the
 * junction to the new submount (ie to setup the fake directory
 * which represents a DFS referral or reparse mount point).
 */
static void cifs_create_junction_fattr(struct cifs_fattr *fattr,
				       struct super_block *sb)
{ … }

/* Update inode with final fattr data */
static int update_inode_info(struct super_block *sb,
			     struct cifs_fattr *fattr,
			     struct inode **inode)
{ … }

#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
static int
cifs_get_file_info_unix(struct file *filp)
{ … }

static int cifs_get_unix_fattr(const unsigned char *full_path,
			       struct super_block *sb,
			       struct cifs_fattr *fattr,
			       struct inode **pinode,
			       const unsigned int xid)
{ … }

int cifs_get_inode_info_unix(struct inode **pinode,
			     const unsigned char *full_path,
			     struct super_block *sb, unsigned int xid)
{ … }
#else
static inline int cifs_get_unix_fattr(const unsigned char *full_path,
				      struct super_block *sb,
				      struct cifs_fattr *fattr,
				      struct inode **pinode,
				      const unsigned int xid)
{
	return -EOPNOTSUPP;
}

int cifs_get_inode_info_unix(struct inode **pinode,
			     const unsigned char *full_path,
			     struct super_block *sb, unsigned int xid)
{
	return -EOPNOTSUPP;
}
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */

static int
cifs_sfu_type(struct cifs_fattr *fattr, const char *path,
	      struct cifs_sb_info *cifs_sb, unsigned int xid)
{ … }

#define SFBITS_MASK …

/*
 * Fetch mode bits as provided by SFU.
 *
 * FIXME: Doesn't this clobber the type bit we got from cifs_sfu_type ?
 */
static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
			 struct cifs_sb_info *cifs_sb, unsigned int xid)
{ … }

/* Fill a cifs_fattr struct with info from POSIX info struct */
static void smb311_posix_info_to_fattr(struct cifs_fattr *fattr,
				       struct cifs_open_info_data *data,
				       struct super_block *sb)
{ … }

static void cifs_open_info_to_fattr(struct cifs_fattr *fattr,
				    struct cifs_open_info_data *data,
				    struct super_block *sb)
{ … }

static int
cifs_get_file_info(struct file *filp)
{ … }

/* Simple function to return a 64 bit hash of string.  Rarely called */
static __u64 simple_hashstr(const char *str)
{ … }

#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
/**
 * cifs_backup_query_path_info - SMB1 fallback code to get ino
 *
 * Fallback code to get file metadata when we don't have access to
 * full_path (EACCES) and have backup creds.
 *
 * @xid:	transaction id used to identify original request in logs
 * @tcon:	information about the server share we have mounted
 * @sb:	the superblock stores info such as disk space available
 * @full_path:	name of the file we are getting the metadata for
 * @resp_buf:	will be set to cifs resp buf and needs to be freed with
 * 		cifs_buf_release() when done with @data
 * @data:	will be set to search info result buffer
 */
static int
cifs_backup_query_path_info(int xid,
			    struct cifs_tcon *tcon,
			    struct super_block *sb,
			    const char *full_path,
			    void **resp_buf,
			    FILE_ALL_INFO **data)
{ … }
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */

static void cifs_set_fattr_ino(int xid, struct cifs_tcon *tcon, struct super_block *sb,
			       struct inode **inode, const char *full_path,
			       struct cifs_open_info_data *data, struct cifs_fattr *fattr)
{ … }

static inline bool is_inode_cache_good(struct inode *ino)
{ … }

static int reparse_info_to_fattr(struct cifs_open_info_data *data,
				 struct super_block *sb,
				 const unsigned int xid,
				 struct cifs_tcon *tcon,
				 const char *full_path,
				 struct cifs_fattr *fattr)
{ … }

static int cifs_get_fattr(struct cifs_open_info_data *data,
			  struct super_block *sb, int xid,
			  const struct cifs_fid *fid,
			  struct cifs_fattr *fattr,
			  struct inode **inode,
			  const char *full_path)
{ … }

int cifs_get_inode_info(struct inode **inode,
			const char *full_path,
			struct cifs_open_info_data *data,
			struct super_block *sb, int xid,
			const struct cifs_fid *fid)
{ … }

static int smb311_posix_get_fattr(struct cifs_open_info_data *data,
				  struct cifs_fattr *fattr,
				  const char *full_path,
				  struct super_block *sb,
				  const unsigned int xid)
{ … }

int smb311_posix_get_inode_info(struct inode **inode,
				const char *full_path,
				struct cifs_open_info_data *data,
				struct super_block *sb,
				const unsigned int xid)
{ … }

static const struct inode_operations cifs_ipc_inode_ops = …;

static int
cifs_find_inode(struct inode *inode, void *opaque)
{ … }

static int
cifs_init_inode(struct inode *inode, void *opaque)
{ … }

/*
 * walk dentry list for an inode and report whether it has aliases that
 * are hashed. We use this to determine if a directory inode can actually
 * be used.
 */
static bool
inode_has_hashed_dentries(struct inode *inode)
{ … }

/* Given fattrs, get a corresponding inode */
struct inode *
cifs_iget(struct super_block *sb, struct cifs_fattr *fattr)
{ … }

/* gets root inode */
struct inode *cifs_root_iget(struct super_block *sb)
{ … }

int
cifs_set_file_info(struct inode *inode, struct iattr *attrs, unsigned int xid,
		   const char *full_path, __u32 dosattr)
{ … }

#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
/*
 * Open the given file (if it isn't already), set the DELETE_ON_CLOSE bit
 * and rename it to a random name that hopefully won't conflict with
 * anything else.
 */
int
cifs_rename_pending_delete(const char *full_path, struct dentry *dentry,
			   const unsigned int xid)
{ … }
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */

/* copied from fs/nfs/dir.c with small changes */
static void
cifs_drop_nlink(struct inode *inode)
{ … }

/*
 * If d_inode(dentry) is null (usually meaning the cached dentry
 * is a negative dentry) then we would attempt a standard SMB delete, but
 * if that fails we can not attempt the fall back mechanisms on EACCES
 * but will return the EACCES to the caller. Note that the VFS does not call
 * unlink on negative dentries currently.
 */
int cifs_unlink(struct inode *dir, struct dentry *dentry)
{ … }

static int
cifs_mkdir_qinfo(struct inode *parent, struct dentry *dentry, umode_t mode,
		 const char *full_path, struct cifs_sb_info *cifs_sb,
		 struct cifs_tcon *tcon, const unsigned int xid)
{ … }

#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
static int
cifs_posix_mkdir(struct inode *inode, struct dentry *dentry, umode_t mode,
		 const char *full_path, struct cifs_sb_info *cifs_sb,
		 struct cifs_tcon *tcon, const unsigned int xid)
{ … }
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */

int cifs_mkdir(struct mnt_idmap *idmap, struct inode *inode,
	       struct dentry *direntry, umode_t mode)
{ … }

int cifs_rmdir(struct inode *inode, struct dentry *direntry)
{ … }

static int
cifs_do_rename(const unsigned int xid, struct dentry *from_dentry,
	       const char *from_path, struct dentry *to_dentry,
	       const char *to_path)
{ … }

int
cifs_rename2(struct mnt_idmap *idmap, struct inode *source_dir,
	     struct dentry *source_dentry, struct inode *target_dir,
	     struct dentry *target_dentry, unsigned int flags)
{ … }

static bool
cifs_dentry_needs_reval(struct dentry *dentry)
{ … }

/**
 * cifs_wait_bit_killable - helper for functions that are sleeping on bit locks
 *
 * @key:	currently unused
 * @mode:	the task state to sleep in
 */
static int
cifs_wait_bit_killable(struct wait_bit_key *key, int mode)
{ … }

int
cifs_revalidate_mapping(struct inode *inode)
{ … }

int
cifs_zap_mapping(struct inode *inode)
{ … }

int cifs_revalidate_file_attr(struct file *filp)
{ … }

int cifs_revalidate_dentry_attr(struct dentry *dentry)
{ … }

int cifs_revalidate_file(struct file *filp)
{ … }

/* revalidate a dentry's inode attributes */
int cifs_revalidate_dentry(struct dentry *dentry)
{ … }

int cifs_getattr(struct mnt_idmap *idmap, const struct path *path,
		 struct kstat *stat, u32 request_mask, unsigned int flags)
{ … }

int cifs_fiemap(struct inode *inode, struct fiemap_extent_info *fei, u64 start,
		u64 len)
{ … }

int cifs_truncate_page(struct address_space *mapping, loff_t from)
{ … }

void cifs_setsize(struct inode *inode, loff_t offset)
{ … }

static int
cifs_set_file_size(struct inode *inode, struct iattr *attrs,
		   unsigned int xid, const char *full_path, struct dentry *dentry)
{ … }

#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
static int
cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
{ … }
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */

static int
cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
{ … }

int
cifs_setattr(struct mnt_idmap *idmap, struct dentry *direntry,
	     struct iattr *attrs)
{ … }