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linux/fs/jffs2/os-linux.h
Christian Brauner c1632a0f11
fs: port ->setattr() to pass mnt_idmap 
Convert to struct mnt_idmap.

Last cycle we merged the necessary infrastructure in
256c8aed2b ("fs: introduce dedicated idmap type for mounts").
This is just the conversion to struct mnt_idmap.

Currently we still pass around the plain namespace that was attached to a
mount. This is in general pretty convenient but it makes it easy to
conflate namespaces that are relevant on the filesystem with namespaces
that are relevent on the mount level. Especially for non-vfs developers
without detailed knowledge in this area this can be a potential source for
bugs.

Once the conversion to struct mnt_idmap is done all helpers down to the
really low-level helpers will take a struct mnt_idmap argument instead of
two namespace arguments. This way it becomes impossible to conflate the two
eliminating the possibility of any bugs. All of the vfs and all filesystems
only operate on struct mnt_idmap.

Acked-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
2023-01-19 09:24:02 +01:00

198 lines
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C
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/*
* JFFS2 -- Journalling Flash File System, Version 2.
*
* Copyright © 2001-2007 Red Hat, Inc.
*
* Created by David Woodhouse <dwmw2@infradead.org>
*
* For licensing information, see the file 'LICENCE' in this directory.
*
*/
#ifndef __JFFS2_OS_LINUX_H__
#define __JFFS2_OS_LINUX_H__
/* JFFS2 uses Linux mode bits natively -- no need for conversion */
#define os_to_jffs2_mode(x) (x)
#define jffs2_to_os_mode(x) (x)
struct kstatfs;
struct kvec;
#define JFFS2_INODE_INFO(i) (container_of(i, struct jffs2_inode_info, vfs_inode))
#define OFNI_EDONI_2SFFJ(f) (&(f)->vfs_inode)
#define JFFS2_SB_INFO(sb) (sb->s_fs_info)
#define OFNI_BS_2SFFJ(c) ((struct super_block *)c->os_priv)
#define JFFS2_F_I_SIZE(f) (OFNI_EDONI_2SFFJ(f)->i_size)
#define JFFS2_F_I_MODE(f) (OFNI_EDONI_2SFFJ(f)->i_mode)
#define JFFS2_F_I_UID(f) (i_uid_read(OFNI_EDONI_2SFFJ(f)))
#define JFFS2_F_I_GID(f) (i_gid_read(OFNI_EDONI_2SFFJ(f)))
#define JFFS2_F_I_RDEV(f) (OFNI_EDONI_2SFFJ(f)->i_rdev)
#define JFFS2_CLAMP_TIME(t) ((uint32_t)clamp_t(time64_t, (t), 0, U32_MAX))
#define ITIME(sec) ((struct timespec64){sec, 0})
#define JFFS2_NOW() JFFS2_CLAMP_TIME(ktime_get_real_seconds())
#define I_SEC(tv) JFFS2_CLAMP_TIME((tv).tv_sec)
#define JFFS2_F_I_CTIME(f) I_SEC(OFNI_EDONI_2SFFJ(f)->i_ctime)
#define JFFS2_F_I_MTIME(f) I_SEC(OFNI_EDONI_2SFFJ(f)->i_mtime)
#define JFFS2_F_I_ATIME(f) I_SEC(OFNI_EDONI_2SFFJ(f)->i_atime)
#define sleep_on_spinunlock(wq, s) \
do { \
DECLARE_WAITQUEUE(__wait, current); \
add_wait_queue((wq), &__wait); \
set_current_state(TASK_UNINTERRUPTIBLE); \
spin_unlock(s); \
schedule(); \
remove_wait_queue((wq), &__wait); \
} while(0)
static inline void jffs2_init_inode_info(struct jffs2_inode_info *f)
{
f->highest_version = 0;
f->fragtree = RB_ROOT;
f->metadata = NULL;
f->dents = NULL;
f->target = NULL;
f->flags = 0;
f->usercompr = 0;
}
#define jffs2_is_readonly(c) (OFNI_BS_2SFFJ(c)->s_flags & SB_RDONLY)
#define SECTOR_ADDR(x) ( (((unsigned long)(x) / c->sector_size) * c->sector_size) )
#ifndef CONFIG_JFFS2_FS_WRITEBUFFER
#ifdef CONFIG_JFFS2_SUMMARY
#define jffs2_can_mark_obsolete(c) (0)
#else
#define jffs2_can_mark_obsolete(c) (1)
#endif
#define jffs2_is_writebuffered(c) (0)
#define jffs2_cleanmarker_oob(c) (0)
#define jffs2_write_nand_cleanmarker(c,jeb) (-EIO)
#define jffs2_flash_write(c, ofs, len, retlen, buf) jffs2_flash_direct_write(c, ofs, len, retlen, buf)
#define jffs2_flash_read(c, ofs, len, retlen, buf) (mtd_read((c)->mtd, ofs, len, retlen, buf))
#define jffs2_flush_wbuf_pad(c) ({ do{} while(0); (void)(c), 0; })
#define jffs2_flush_wbuf_gc(c, i) ({ do{} while(0); (void)(c), (void) i, 0; })
#define jffs2_write_nand_badblock(c,jeb,bad_offset) (1)
#define jffs2_nand_flash_setup(c) (0)
#define jffs2_nand_flash_cleanup(c) do {} while(0)
#define jffs2_wbuf_dirty(c) (0)
#define jffs2_flash_writev(a,b,c,d,e,f) jffs2_flash_direct_writev(a,b,c,d,e)
#define jffs2_wbuf_timeout NULL
#define jffs2_wbuf_process NULL
#define jffs2_dataflash(c) (0)
#define jffs2_dataflash_setup(c) (0)
#define jffs2_dataflash_cleanup(c) do {} while (0)
#define jffs2_nor_wbuf_flash(c) (0)
#define jffs2_nor_wbuf_flash_setup(c) (0)
#define jffs2_nor_wbuf_flash_cleanup(c) do {} while (0)
#define jffs2_ubivol(c) (0)
#define jffs2_ubivol_setup(c) (0)
#define jffs2_ubivol_cleanup(c) do {} while (0)
#define jffs2_dirty_trigger(c) do {} while (0)
#else /* NAND and/or ECC'd NOR support present */
#define jffs2_is_writebuffered(c) (c->wbuf != NULL)
#ifdef CONFIG_JFFS2_SUMMARY
#define jffs2_can_mark_obsolete(c) (0)
#else
#define jffs2_can_mark_obsolete(c) (c->mtd->flags & (MTD_BIT_WRITEABLE))
#endif
#define jffs2_cleanmarker_oob(c) (c->mtd->type == MTD_NANDFLASH)
#define jffs2_wbuf_dirty(c) (!!(c)->wbuf_len)
/* wbuf.c */
int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *vecs, unsigned long count, loff_t to, size_t *retlen, uint32_t ino);
int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, const u_char *buf);
int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf);
int jffs2_check_oob_empty(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,int mode);
int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb);
int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset);
void jffs2_wbuf_timeout(unsigned long data);
void jffs2_wbuf_process(void *data);
int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino);
int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c);
int jffs2_nand_flash_setup(struct jffs2_sb_info *c);
void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c);
#define jffs2_dataflash(c) (c->mtd->type == MTD_DATAFLASH)
int jffs2_dataflash_setup(struct jffs2_sb_info *c);
void jffs2_dataflash_cleanup(struct jffs2_sb_info *c);
#define jffs2_ubivol(c) (c->mtd->type == MTD_UBIVOLUME)
int jffs2_ubivol_setup(struct jffs2_sb_info *c);
void jffs2_ubivol_cleanup(struct jffs2_sb_info *c);
#define jffs2_nor_wbuf_flash(c) (c->mtd->type == MTD_NORFLASH && ! (c->mtd->flags & MTD_BIT_WRITEABLE))
int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c);
void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c);
void jffs2_dirty_trigger(struct jffs2_sb_info *c);
#endif /* WRITEBUFFER */
/* background.c */
int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c);
void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c);
void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c);
/* dir.c */
extern const struct file_operations jffs2_dir_operations;
extern const struct inode_operations jffs2_dir_inode_operations;
/* file.c */
extern const struct file_operations jffs2_file_operations;
extern const struct inode_operations jffs2_file_inode_operations;
extern const struct address_space_operations jffs2_file_address_operations;
int jffs2_fsync(struct file *, loff_t, loff_t, int);
int __jffs2_read_folio(struct file *file, struct folio *folio);
/* ioctl.c */
long jffs2_ioctl(struct file *, unsigned int, unsigned long);
/* symlink.c */
extern const struct inode_operations jffs2_symlink_inode_operations;
/* fs.c */
int jffs2_setattr (struct mnt_idmap *, struct dentry *, struct iattr *);
int jffs2_do_setattr (struct inode *, struct iattr *);
struct inode *jffs2_iget(struct super_block *, unsigned long);
void jffs2_evict_inode (struct inode *);
void jffs2_dirty_inode(struct inode *inode, int flags);
struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode,
struct jffs2_raw_inode *ri);
int jffs2_statfs (struct dentry *, struct kstatfs *);
int jffs2_do_remount_fs(struct super_block *sb, struct fs_context *fc);
int jffs2_do_fill_super(struct super_block *sb, struct fs_context *fc);
void jffs2_gc_release_inode(struct jffs2_sb_info *c,
struct jffs2_inode_info *f);
struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
int inum, int unlinked);
unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
struct jffs2_inode_info *f,
unsigned long offset,
unsigned long *priv);
void jffs2_flash_cleanup(struct jffs2_sb_info *c);
/* writev.c */
int jffs2_flash_direct_writev(struct jffs2_sb_info *c, const struct kvec *vecs,
unsigned long count, loff_t to, size_t *retlen);
int jffs2_flash_direct_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
size_t *retlen, const u_char *buf);
#endif /* __JFFS2_OS_LINUX_H__ */
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