313 lines
9.0 KiB
C
313 lines
9.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* fs/ internal definitions
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*
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* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*/
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struct super_block;
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struct file_system_type;
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struct iomap;
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struct iomap_ops;
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struct linux_binprm;
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struct path;
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struct mount;
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struct shrink_control;
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struct fs_context;
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struct pipe_inode_info;
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struct iov_iter;
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struct mnt_idmap;
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/*
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* block/bdev.c
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*/
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#ifdef CONFIG_BLOCK
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extern void __init bdev_cache_init(void);
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#else
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static inline void bdev_cache_init(void)
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{
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}
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#endif /* CONFIG_BLOCK */
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/*
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* buffer.c
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*/
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int __block_write_begin_int(struct folio *folio, loff_t pos, unsigned len,
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get_block_t *get_block, const struct iomap *iomap);
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/*
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* char_dev.c
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*/
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extern void __init chrdev_init(void);
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/*
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* fs_context.c
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*/
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extern const struct fs_context_operations legacy_fs_context_ops;
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extern int parse_monolithic_mount_data(struct fs_context *, void *);
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extern void vfs_clean_context(struct fs_context *fc);
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extern int finish_clean_context(struct fs_context *fc);
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/*
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* namei.c
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*/
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extern int filename_lookup(int dfd, struct filename *name, unsigned flags,
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struct path *path, struct path *root);
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int do_rmdir(int dfd, struct filename *name);
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int do_unlinkat(int dfd, struct filename *name);
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int may_linkat(struct mnt_idmap *idmap, const struct path *link);
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int do_renameat2(int olddfd, struct filename *oldname, int newdfd,
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struct filename *newname, unsigned int flags);
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int do_mkdirat(int dfd, struct filename *name, umode_t mode);
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int do_symlinkat(struct filename *from, int newdfd, struct filename *to);
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int do_linkat(int olddfd, struct filename *old, int newdfd,
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struct filename *new, int flags);
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/*
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* namespace.c
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*/
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extern struct vfsmount *lookup_mnt(const struct path *);
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extern int finish_automount(struct vfsmount *, const struct path *);
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extern int sb_prepare_remount_readonly(struct super_block *);
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extern void __init mnt_init(void);
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int mnt_get_write_access_file(struct file *file);
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void mnt_put_write_access_file(struct file *file);
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extern void dissolve_on_fput(struct vfsmount *);
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extern bool may_mount(void);
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int path_mount(const char *dev_name, struct path *path,
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const char *type_page, unsigned long flags, void *data_page);
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int path_umount(struct path *path, int flags);
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int show_path(struct seq_file *m, struct dentry *root);
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/*
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* fs_struct.c
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*/
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extern void chroot_fs_refs(const struct path *, const struct path *);
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/*
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* file_table.c
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*/
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struct file *alloc_empty_file(int flags, const struct cred *cred);
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struct file *alloc_empty_file_noaccount(int flags, const struct cred *cred);
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struct file *alloc_empty_backing_file(int flags, const struct cred *cred);
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static inline void file_put_write_access(struct file *file)
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{
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put_write_access(file->f_inode);
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mnt_put_write_access(file->f_path.mnt);
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if (unlikely(file->f_mode & FMODE_BACKING))
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mnt_put_write_access(backing_file_user_path(file)->mnt);
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}
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static inline void put_file_access(struct file *file)
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{
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if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) {
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i_readcount_dec(file->f_inode);
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} else if (file->f_mode & FMODE_WRITER) {
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file_put_write_access(file);
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}
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}
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/*
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* super.c
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*/
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extern int reconfigure_super(struct fs_context *);
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extern bool super_trylock_shared(struct super_block *sb);
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struct super_block *user_get_super(dev_t, bool excl);
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void put_super(struct super_block *sb);
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extern bool mount_capable(struct fs_context *);
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int sb_init_dio_done_wq(struct super_block *sb);
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/*
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* Prepare superblock for changing its read-only state (i.e., either remount
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* read-write superblock read-only or vice versa). After this function returns
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* mnt_is_readonly() will return true for any mount of the superblock if its
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* caller is able to observe any changes done by the remount. This holds until
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* sb_end_ro_state_change() is called.
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*/
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static inline void sb_start_ro_state_change(struct super_block *sb)
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{
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WRITE_ONCE(sb->s_readonly_remount, 1);
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/*
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* For RO->RW transition, the barrier pairs with the barrier in
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* mnt_is_readonly() making sure if mnt_is_readonly() sees SB_RDONLY
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* cleared, it will see s_readonly_remount set.
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* For RW->RO transition, the barrier pairs with the barrier in
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* mnt_get_write_access() before the mnt_is_readonly() check.
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* The barrier makes sure if mnt_get_write_access() sees MNT_WRITE_HOLD
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* already cleared, it will see s_readonly_remount set.
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*/
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smp_wmb();
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}
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/*
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* Ends section changing read-only state of the superblock. After this function
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* returns if mnt_is_readonly() returns false, the caller will be able to
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* observe all the changes remount did to the superblock.
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*/
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static inline void sb_end_ro_state_change(struct super_block *sb)
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{
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/*
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* This barrier provides release semantics that pairs with
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* the smp_rmb() acquire semantics in mnt_is_readonly().
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* This barrier pair ensure that when mnt_is_readonly() sees
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* 0 for sb->s_readonly_remount, it will also see all the
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* preceding flag changes that were made during the RO state
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* change.
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*/
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smp_wmb();
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WRITE_ONCE(sb->s_readonly_remount, 0);
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}
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/*
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* open.c
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*/
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struct open_flags {
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int open_flag;
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umode_t mode;
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int acc_mode;
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int intent;
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int lookup_flags;
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};
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extern struct file *do_filp_open(int dfd, struct filename *pathname,
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const struct open_flags *op);
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extern struct file *do_file_open_root(const struct path *,
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const char *, const struct open_flags *);
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extern struct open_how build_open_how(int flags, umode_t mode);
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extern int build_open_flags(const struct open_how *how, struct open_flags *op);
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struct file *file_close_fd_locked(struct files_struct *files, unsigned fd);
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long do_sys_ftruncate(unsigned int fd, loff_t length, int small);
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int chmod_common(const struct path *path, umode_t mode);
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int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
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int flag);
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int chown_common(const struct path *path, uid_t user, gid_t group);
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extern int vfs_open(const struct path *, struct file *);
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/*
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* inode.c
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*/
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extern long prune_icache_sb(struct super_block *sb, struct shrink_control *sc);
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int dentry_needs_remove_privs(struct mnt_idmap *, struct dentry *dentry);
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bool in_group_or_capable(struct mnt_idmap *idmap,
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const struct inode *inode, vfsgid_t vfsgid);
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/*
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* fs-writeback.c
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*/
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extern long get_nr_dirty_inodes(void);
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void invalidate_inodes(struct super_block *sb);
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/*
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* dcache.c
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*/
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extern int d_set_mounted(struct dentry *dentry);
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extern long prune_dcache_sb(struct super_block *sb, struct shrink_control *sc);
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extern struct dentry *d_alloc_cursor(struct dentry *);
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extern struct dentry * d_alloc_pseudo(struct super_block *, const struct qstr *);
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extern char *simple_dname(struct dentry *, char *, int);
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extern void dput_to_list(struct dentry *, struct list_head *);
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extern void shrink_dentry_list(struct list_head *);
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extern void shrink_dcache_for_umount(struct super_block *);
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extern struct dentry *__d_lookup(const struct dentry *, const struct qstr *);
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extern struct dentry *__d_lookup_rcu(const struct dentry *parent,
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const struct qstr *name, unsigned *seq);
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extern void d_genocide(struct dentry *);
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/*
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* pipe.c
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*/
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extern const struct file_operations pipefifo_fops;
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/*
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* fs_pin.c
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*/
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extern void group_pin_kill(struct hlist_head *p);
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extern void mnt_pin_kill(struct mount *m);
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/*
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* fs/nsfs.c
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*/
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extern const struct dentry_operations ns_dentry_operations;
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/*
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* fs/stat.c:
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*/
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int getname_statx_lookup_flags(int flags);
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int do_statx(int dfd, struct filename *filename, unsigned int flags,
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unsigned int mask, struct statx __user *buffer);
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/*
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* fs/splice.c:
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*/
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ssize_t splice_file_to_pipe(struct file *in,
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struct pipe_inode_info *opipe,
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loff_t *offset,
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size_t len, unsigned int flags);
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/*
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* fs/xattr.c:
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*/
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struct xattr_name {
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char name[XATTR_NAME_MAX + 1];
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};
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struct xattr_ctx {
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/* Value of attribute */
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union {
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const void __user *cvalue;
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void __user *value;
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};
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void *kvalue;
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size_t size;
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/* Attribute name */
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struct xattr_name *kname;
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unsigned int flags;
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};
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ssize_t do_getxattr(struct mnt_idmap *idmap,
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struct dentry *d,
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struct xattr_ctx *ctx);
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int setxattr_copy(const char __user *name, struct xattr_ctx *ctx);
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int do_setxattr(struct mnt_idmap *idmap, struct dentry *dentry,
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struct xattr_ctx *ctx);
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int may_write_xattr(struct mnt_idmap *idmap, struct inode *inode);
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#ifdef CONFIG_FS_POSIX_ACL
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int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
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const char *acl_name, const void *kvalue, size_t size);
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ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
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const char *acl_name, void *kvalue, size_t size);
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#else
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static inline int do_set_acl(struct mnt_idmap *idmap,
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struct dentry *dentry, const char *acl_name,
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const void *kvalue, size_t size)
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{
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return -EOPNOTSUPP;
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}
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static inline ssize_t do_get_acl(struct mnt_idmap *idmap,
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struct dentry *dentry, const char *acl_name,
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void *kvalue, size_t size)
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{
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return -EOPNOTSUPP;
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}
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#endif
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ssize_t __kernel_write_iter(struct file *file, struct iov_iter *from, loff_t *pos);
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/*
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* fs/attr.c
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*/
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struct mnt_idmap *alloc_mnt_idmap(struct user_namespace *mnt_userns);
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struct mnt_idmap *mnt_idmap_get(struct mnt_idmap *idmap);
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void mnt_idmap_put(struct mnt_idmap *idmap);
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