// SPDX-License-Identifier: GPL-2.0-only /* * linux/fs/vfat/namei.c * * Written 1992,1993 by Werner Almesberger * * Windows95/Windows NT compatible extended MSDOS filesystem * by Gordon Chaffee Copyright (C) 1995. Send bug reports for the * VFAT filesystem to <[email protected]>. Specify * what file operation caused you trouble and if you can duplicate * the problem, send a script that demonstrates it. * * Short name translation 1999, 2001 by Wolfram Pienkoss <[email protected]> * * Support Multibyte characters and cleanup by * OGAWA Hirofumi <[email protected]> */ #include <linux/module.h> #include <linux/ctype.h> #include <linux/slab.h> #include <linux/namei.h> #include <linux/kernel.h> #include <linux/iversion.h> #include "fat.h" static inline unsigned long vfat_d_version(struct dentry *dentry) { … } static inline void vfat_d_version_set(struct dentry *dentry, unsigned long version) { … } /* * If new entry was created in the parent, it could create the 8.3 * alias (the shortname of logname). So, the parent may have the * negative-dentry which matches the created 8.3 alias. * * If it happened, the negative dentry isn't actually negative * anymore. So, drop it. */ static int vfat_revalidate_shortname(struct dentry *dentry) { … } static int vfat_revalidate(struct dentry *dentry, unsigned int flags) { … } static int vfat_revalidate_ci(struct dentry *dentry, unsigned int flags) { … } /* returns the length of a struct qstr, ignoring trailing dots */ static unsigned int __vfat_striptail_len(unsigned int len, const char *name) { … } static unsigned int vfat_striptail_len(const struct qstr *qstr) { … } /* * Compute the hash for the vfat name corresponding to the dentry. * Note: if the name is invalid, we leave the hash code unchanged so * that the existing dentry can be used. The vfat fs routines will * return ENOENT or EINVAL as appropriate. */ static int vfat_hash(const struct dentry *dentry, struct qstr *qstr) { … } /* * Compute the hash for the vfat name corresponding to the dentry. * Note: if the name is invalid, we leave the hash code unchanged so * that the existing dentry can be used. The vfat fs routines will * return ENOENT or EINVAL as appropriate. */ static int vfat_hashi(const struct dentry *dentry, struct qstr *qstr) { … } /* * Case insensitive compare of two vfat names. */ static int vfat_cmpi(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { … } /* * Case sensitive compare of two vfat names. */ static int vfat_cmp(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { … } static const struct dentry_operations vfat_ci_dentry_ops = …; static const struct dentry_operations vfat_dentry_ops = …; /* Characters that are undesirable in an MS-DOS file name */ static inline bool vfat_bad_char(wchar_t w) { … } static inline bool vfat_replace_char(wchar_t w) { … } static wchar_t vfat_skip_char(wchar_t w) { … } static inline int vfat_is_used_badchars(const wchar_t *s, int len) { … } static int vfat_find_form(struct inode *dir, unsigned char *name) { … } /* * 1) Valid characters for the 8.3 format alias are any combination of * letters, uppercase alphabets, digits, any of the * following special characters: * $ % ' ` - @ { } ~ ! # ( ) & _ ^ * In this case Longfilename is not stored in disk. * * WinNT's Extension: * File name and extension name is contain uppercase/lowercase * only. And it is expressed by CASE_LOWER_BASE and CASE_LOWER_EXT. * * 2) File name is 8.3 format, but it contain the uppercase and * lowercase char, muliti bytes char, etc. In this case numtail is not * added, but Longfilename is stored. * * 3) When the one except for the above, or the following special * character are contained: * . [ ] ; , + = * numtail is added, and Longfilename must be stored in disk . */ struct shortname_info { … }; #define INIT_SHORTNAME_INFO(x) … static inline int to_shortname_char(struct nls_table *nls, unsigned char *buf, int buf_size, wchar_t *src, struct shortname_info *info) { … } /* * Given a valid longname, create a unique shortname. Make sure the * shortname does not exist * Returns negative number on error, 0 for a normal * return, and 1 for valid shortname */ static int vfat_create_shortname(struct inode *dir, struct nls_table *nls, wchar_t *uname, int ulen, unsigned char *name_res, unsigned char *lcase) { … } /* Translate a string, including coded sequences into Unicode */ static int xlate_to_uni(const unsigned char *name, int len, unsigned char *outname, int *longlen, int *outlen, int escape, int utf8, struct nls_table *nls) { … } static int vfat_build_slots(struct inode *dir, const unsigned char *name, int len, int is_dir, int cluster, struct timespec64 *ts, struct msdos_dir_slot *slots, int *nr_slots) { … } static int vfat_add_entry(struct inode *dir, const struct qstr *qname, int is_dir, int cluster, struct timespec64 *ts, struct fat_slot_info *sinfo) { … } static int vfat_find(struct inode *dir, const struct qstr *qname, struct fat_slot_info *sinfo) { … } static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags) { … } static int vfat_create(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, umode_t mode, bool excl) { … } static int vfat_rmdir(struct inode *dir, struct dentry *dentry) { … } static int vfat_unlink(struct inode *dir, struct dentry *dentry) { … } static int vfat_mkdir(struct mnt_idmap *idmap, struct inode *dir, struct dentry *dentry, umode_t mode) { … } static int vfat_get_dotdot_de(struct inode *inode, struct buffer_head **bh, struct msdos_dir_entry **de) { … } static int vfat_sync_ipos(struct inode *dir, struct inode *inode) { … } static int vfat_update_dotdot_de(struct inode *dir, struct inode *inode, struct buffer_head *dotdot_bh, struct msdos_dir_entry *dotdot_de) { … } static void vfat_update_dir_metadata(struct inode *dir, struct timespec64 *ts) { … } static int vfat_rename(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { … } static void vfat_exchange_ipos(struct inode *old_inode, struct inode *new_inode, loff_t old_i_pos, loff_t new_i_pos) { … } static void vfat_move_nlink(struct inode *src, struct inode *dst) { … } static int vfat_rename_exchange(struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry) { … } static int vfat_rename2(struct mnt_idmap *idmap, struct inode *old_dir, struct dentry *old_dentry, struct inode *new_dir, struct dentry *new_dentry, unsigned int flags) { … } static const struct inode_operations vfat_dir_inode_operations = …; static void setup(struct super_block *sb) { … } static int vfat_fill_super(struct super_block *sb, struct fs_context *fc) { … } static int vfat_get_tree(struct fs_context *fc) { … } static int vfat_parse_param(struct fs_context *fc, struct fs_parameter *param) { … } static const struct fs_context_operations vfat_context_ops = …; static int vfat_init_fs_context(struct fs_context *fc) { … } static struct file_system_type vfat_fs_type = …; MODULE_ALIAS_FS(…) …; static int __init init_vfat_fs(void) { … } static void __exit exit_vfat_fs(void) { … } MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; module_init(…) … module_exit(…)
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