// SPDX-License-Identifier: GPL-2.0-only /* * linux/fs/isofs/inode.c * * (C) 1991 Linus Torvalds - minix filesystem * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. * 1994 Eberhard Mönkeberg - multi session handling. * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs. * 1997 Gordon Chaffee - Joliet CDs * 1998 Eric Lammerts - ISO 9660 Level 3 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB * 2004 Paul Serice - NFS Export Operations */ #include <linux/init.h> #include <linux/module.h> #include <linux/slab.h> #include <linux/cred.h> #include <linux/nls.h> #include <linux/ctype.h> #include <linux/statfs.h> #include <linux/cdrom.h> #include <linux/mpage.h> #include <linux/user_namespace.h> #include <linux/seq_file.h> #include <linux/blkdev.h> #include <linux/fs_context.h> #include <linux/fs_parser.h> #include "isofs.h" #include "zisofs.h" /* max tz offset is 13 hours */ #define MAX_TZ_OFFSET … #define BEQUIET static int isofs_hashi(const struct dentry *parent, struct qstr *qstr); static int isofs_dentry_cmpi(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name); #ifdef CONFIG_JOLIET static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr); static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr); static int isofs_dentry_cmpi_ms(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name); static int isofs_dentry_cmp_ms(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name); #endif static void isofs_put_super(struct super_block *sb) { … } static int isofs_read_inode(struct inode *, int relocated); static int isofs_statfs (struct dentry *, struct kstatfs *); static int isofs_show_options(struct seq_file *, struct dentry *); static struct kmem_cache *isofs_inode_cachep; static struct inode *isofs_alloc_inode(struct super_block *sb) { … } static void isofs_free_inode(struct inode *inode) { … } static void init_once(void *foo) { … } static int __init init_inodecache(void) { … } static void destroy_inodecache(void) { … } static int isofs_reconfigure(struct fs_context *fc) { … } static const struct super_operations isofs_sops = …; static const struct dentry_operations isofs_dentry_ops[] = …; struct isofs_options{ … }; /* * Compute the hash for the isofs name corresponding to the dentry. */ static int isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms) { … } /* * Compare of two isofs names. */ static int isofs_dentry_cmp_common( unsigned int len, const char *str, const struct qstr *name, int ms, int ci) { … } static int isofs_hashi(const struct dentry *dentry, struct qstr *qstr) { … } static int isofs_dentry_cmpi(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { … } #ifdef CONFIG_JOLIET /* * Compute the hash for the isofs name corresponding to the dentry. */ static int isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms) { … } static int isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr) { … } static int isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr) { … } static int isofs_dentry_cmp_ms(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { … } static int isofs_dentry_cmpi_ms(const struct dentry *dentry, unsigned int len, const char *str, const struct qstr *name) { … } #endif enum { … }; static const struct constant_table isofs_param_map[] = …; static const struct constant_table isofs_param_check[] = …; static const struct fs_parameter_spec isofs_param_spec[] = …; static int isofs_parse_param(struct fs_context *fc, struct fs_parameter *param) { … } /* * Display the mount options in /proc/mounts. */ static int isofs_show_options(struct seq_file *m, struct dentry *root) { … } /* * look if the driver can tell the multi session redirection value * * don't change this if you don't know what you do, please! * Multisession is legal only with XA disks. * A non-XA disk with more than one volume descriptor may do it right, but * usually is written in a nowhere standardized "multi-partition" manner. * Multisession uses absolute addressing (solely the first frame of the whole * track is #0), multi-partition uses relative addressing (each first frame of * each track is #0), and a track is not a session. * * A broken CDwriter software or drive firmware does not set new standards, * at least not if conflicting with the existing ones. * * [email protected] */ #define WE_OBEY_THE_WRITTEN_STANDARDS … static unsigned int isofs_get_last_session(struct super_block *sb, s32 session) { … } /* * Check if root directory is empty (has less than 3 files). * * Used to detect broken CDs where ISO root directory is empty but Joliet root * directory is OK. If such CD has Rock Ridge extensions, they will be disabled * (and Joliet used instead) or else no files would be visible. */ static bool rootdir_empty(struct super_block *sb, unsigned long block) { … } /* * Initialize the superblock and read the root inode. */ static int isofs_fill_super(struct super_block *s, struct fs_context *fc) { … } static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf) { … } /* * Get a set of blocks; filling in buffer_heads if already allocated * or getblk() if they are not. Returns the number of blocks inserted * (-ve == error.) */ int isofs_get_blocks(struct inode *inode, sector_t iblock, struct buffer_head **bh, unsigned long nblocks) { … } /* * Used by the standard interfaces. */ static int isofs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) { … } static int isofs_bmap(struct inode *inode, sector_t block) { … } struct buffer_head *isofs_bread(struct inode *inode, sector_t block) { … } static int isofs_read_folio(struct file *file, struct folio *folio) { … } static void isofs_readahead(struct readahead_control *rac) { … } static sector_t _isofs_bmap(struct address_space *mapping, sector_t block) { … } static const struct address_space_operations isofs_aops = …; static int isofs_read_level3_size(struct inode *inode) { … } static int isofs_read_inode(struct inode *inode, int relocated) { … } struct isofs_iget5_callback_data { … }; static int isofs_iget5_test(struct inode *ino, void *data) { … } static int isofs_iget5_set(struct inode *ino, void *data) { … } /* Store, in the inode's containing structure, the block and block * offset that point to the underlying meta-data for the inode. The * code below is otherwise similar to the iget() code in * include/linux/fs.h */ struct inode *__isofs_iget(struct super_block *sb, unsigned long block, unsigned long offset, int relocated) { … } static int isofs_get_tree(struct fs_context *fc) { … } static void isofs_free_fc(struct fs_context *fc) { … } static const struct fs_context_operations isofs_context_ops = …; static int isofs_init_fs_context(struct fs_context *fc) { … } static struct file_system_type iso9660_fs_type = …; MODULE_ALIAS_FS(…) …; MODULE_ALIAS(…) …; static int __init init_iso9660_fs(void) { … } static void __exit exit_iso9660_fs(void) { … } module_init(…) … module_exit(…) MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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