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4b901256a7
linux/fs/nilfs2/nilfs.h
Ryusuke Konishi 4b901256a7 nilfs2: add support for FS_IOC_GETFSLABEL 
Implement support for FS_IOC_GETFSLABEL ioctl to read filesystem label.

Link: https://lkml.kernel.org/r/20240815074408.5550-4-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-09-01 20:43:34 -07:00

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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* NILFS local header file.
*
* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
*
* Written by Koji Sato and Ryusuke Konishi.
*/
#ifndef _NILFS_H
#define _NILFS_H
#include <linux/kernel.h>
#include <linux/buffer_head.h>
#include <linux/spinlock.h>
#include <linux/blkdev.h>
#include <linux/nilfs2_api.h>
#include <linux/nilfs2_ondisk.h>
#include "the_nilfs.h"
#include "bmap.h"
/**
* struct nilfs_inode_info - nilfs inode data in memory
* @i_flags: inode flags
* @i_state: dynamic state flags
* @i_bmap: pointer on i_bmap_data
* @i_bmap_data: raw block mapping
* @i_xattr: <TODO>
* @i_dir_start_lookup: page index of last successful search
* @i_cno: checkpoint number for GC inode
* @i_assoc_inode: associated inode (B-tree node cache holder or back pointer)
* @i_dirty: list for connecting dirty files
* @xattr_sem: semaphore for extended attributes processing
* @i_bh: buffer contains disk inode
* @i_root: root object of the current filesystem tree
* @vfs_inode: VFS inode object
*/
struct nilfs_inode_info {
__u32 i_flags;
unsigned long i_state; /* Dynamic state flags */
struct nilfs_bmap *i_bmap;
struct nilfs_bmap i_bmap_data;
__u64 i_xattr; /* sector_t ??? */
__u32 i_dir_start_lookup;
__u64 i_cno; /* check point number for GC inode */
struct inode *i_assoc_inode;
struct list_head i_dirty; /* List for connecting dirty files */
#ifdef CONFIG_NILFS_XATTR
/*
* Extended attributes can be read independently of the main file
* data. Taking i_sem even when reading would cause contention
* between readers of EAs and writers of regular file data, so
* instead we synchronize on xattr_sem when reading or changing
* EAs.
*/
struct rw_semaphore xattr_sem;
#endif
struct buffer_head *i_bh; /*
* i_bh contains a new or dirty
* disk inode.
*/
struct nilfs_root *i_root;
struct inode vfs_inode;
};
static inline struct nilfs_inode_info *NILFS_I(const struct inode *inode)
{
return container_of(inode, struct nilfs_inode_info, vfs_inode);
}
static inline struct nilfs_inode_info *
NILFS_BMAP_I(const struct nilfs_bmap *bmap)
{
return container_of(bmap, struct nilfs_inode_info, i_bmap_data);
}
/*
* Dynamic state flags of NILFS on-memory inode (i_state)
*/
enum {
NILFS_I_NEW = 0, /* Inode is newly created */
NILFS_I_DIRTY, /* The file is dirty */
NILFS_I_QUEUED, /* inode is in dirty_files list */
NILFS_I_BUSY, /*
* Inode is grabbed by a segment
* constructor
*/
NILFS_I_COLLECTED, /* All dirty blocks are collected */
NILFS_I_UPDATED, /* The file has been written back */
NILFS_I_INODE_SYNC, /* dsync is not allowed for inode */
NILFS_I_BMAP, /* has bmap and btnode_cache */
NILFS_I_GCINODE, /* inode for GC, on memory only */
NILFS_I_BTNC, /* inode for btree node cache */
NILFS_I_SHADOW, /* inode for shadowed page cache */
};
/*
* commit flags for nilfs_commit_super and nilfs_sync_super
*/
enum {
NILFS_SB_COMMIT = 0, /* Commit a super block alternately */
NILFS_SB_COMMIT_ALL /* Commit both super blocks */
};
/**
* define NILFS_MAX_VOLUME_NAME - maximum number of characters (bytes) in a
* file system volume name
*
* Defined by the size of the volume name field in the on-disk superblocks.
* This volume name does not include the terminating NULL byte if the string
* length matches the field size, so use (NILFS_MAX_VOLUME_NAME + 1) for the
* size of the buffer that requires a NULL byte termination.
*/
#define NILFS_MAX_VOLUME_NAME \
sizeof_field(struct nilfs_super_block, s_volume_name)
/*
* Macros to check inode numbers
*/
#define NILFS_MDT_INO_BITS \
(BIT(NILFS_DAT_INO) | BIT(NILFS_CPFILE_INO) | \
BIT(NILFS_SUFILE_INO) | BIT(NILFS_IFILE_INO) | \
BIT(NILFS_ATIME_INO) | BIT(NILFS_SKETCH_INO))
#define NILFS_SYS_INO_BITS (BIT(NILFS_ROOT_INO) | NILFS_MDT_INO_BITS)
#define NILFS_FIRST_INO(sb) (((struct the_nilfs *)sb->s_fs_info)->ns_first_ino)
#define NILFS_MDT_INODE(sb, ino) \
((ino) < NILFS_USER_INO && (NILFS_MDT_INO_BITS & BIT(ino)))
#define NILFS_VALID_INODE(sb, ino) \
((ino) >= NILFS_FIRST_INO(sb) || \
((ino) < NILFS_USER_INO && (NILFS_SYS_INO_BITS & BIT(ino))))
#define NILFS_PRIVATE_INODE(ino) ({ \
ino_t __ino = (ino); \
((__ino) < NILFS_USER_INO && (__ino) != NILFS_ROOT_INO && \
(__ino) != NILFS_SKETCH_INO); })
/**
* struct nilfs_transaction_info: context information for synchronization
* @ti_magic: Magic number
* @ti_save: Backup of journal_info field of task_struct
* @ti_flags: Flags
* @ti_count: Nest level
*/
struct nilfs_transaction_info {
u32 ti_magic;
void *ti_save;
/*
* This should never be used. If it happens,
* one of other filesystems has a bug.
*/
unsigned short ti_flags;
unsigned short ti_count;
};
/* ti_magic */
#define NILFS_TI_MAGIC 0xd9e392fb
/* ti_flags */
#define NILFS_TI_DYNAMIC_ALLOC 0x0001 /* Allocated from slab */
#define NILFS_TI_SYNC 0x0002 /*
* Force to construct segment at the
* end of transaction.
*/
#define NILFS_TI_GC 0x0004 /* GC context */
#define NILFS_TI_COMMIT 0x0008 /* Change happened or not */
#define NILFS_TI_WRITER 0x0010 /* Constructor context */
int nilfs_transaction_begin(struct super_block *,
struct nilfs_transaction_info *, int);
int nilfs_transaction_commit(struct super_block *);
void nilfs_transaction_abort(struct super_block *);
static inline void nilfs_set_transaction_flag(unsigned int flag)
{
struct nilfs_transaction_info *ti = current->journal_info;
ti->ti_flags |= flag;
}
static inline int nilfs_test_transaction_flag(unsigned int flag)
{
struct nilfs_transaction_info *ti = current->journal_info;
if (ti == NULL || ti->ti_magic != NILFS_TI_MAGIC)
return 0;
return !!(ti->ti_flags & flag);
}
static inline int nilfs_doing_gc(void)
{
return nilfs_test_transaction_flag(NILFS_TI_GC);
}
static inline int nilfs_doing_construction(void)
{
return nilfs_test_transaction_flag(NILFS_TI_WRITER);
}
/*
* function prototype
*/
#ifdef CONFIG_NILFS_POSIX_ACL
#error "NILFS: not yet supported POSIX ACL"
extern int nilfs_acl_chmod(struct inode *);
extern int nilfs_init_acl(struct inode *, struct inode *);
#else
static inline int nilfs_acl_chmod(struct inode *inode)
{
return 0;
}
static inline int nilfs_init_acl(struct inode *inode, struct inode *dir)
{
if (S_ISLNK(inode->i_mode))
return 0;
inode->i_mode &= ~current_umask();
return 0;
}
#endif
#define NILFS_ATIME_DISABLE
/* Flags that should be inherited by new inodes from their parent. */
#define NILFS_FL_INHERITED \
(FS_SECRM_FL | FS_UNRM_FL | FS_COMPR_FL | FS_SYNC_FL | \
FS_IMMUTABLE_FL | FS_APPEND_FL | FS_NODUMP_FL | FS_NOATIME_FL |\
FS_COMPRBLK_FL | FS_NOCOMP_FL | FS_NOTAIL_FL | FS_DIRSYNC_FL)
/* Mask out flags that are inappropriate for the given type of inode. */
static inline __u32 nilfs_mask_flags(umode_t mode, __u32 flags)
{
if (S_ISDIR(mode))
return flags;
else if (S_ISREG(mode))
return flags & ~(FS_DIRSYNC_FL | FS_TOPDIR_FL);
else
return flags & (FS_NODUMP_FL | FS_NOATIME_FL);
}
/* dir.c */
int nilfs_add_link(struct dentry *, struct inode *);
ino_t nilfs_inode_by_name(struct inode *, const struct qstr *);
int nilfs_make_empty(struct inode *, struct inode *);
struct nilfs_dir_entry *nilfs_find_entry(struct inode *, const struct qstr *,
struct folio **);
int nilfs_delete_entry(struct nilfs_dir_entry *, struct folio *);
int nilfs_empty_dir(struct inode *);
struct nilfs_dir_entry *nilfs_dotdot(struct inode *, struct folio **);
void nilfs_set_link(struct inode *, struct nilfs_dir_entry *,
struct folio *, struct inode *);
/* file.c */
extern int nilfs_sync_file(struct file *, loff_t, loff_t, int);
/* ioctl.c */
int nilfs_fileattr_get(struct dentry *dentry, struct fileattr *m);
int nilfs_fileattr_set(struct mnt_idmap *idmap,
struct dentry *dentry, struct fileattr *fa);
long nilfs_ioctl(struct file *, unsigned int, unsigned long);
long nilfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
int nilfs_ioctl_prepare_clean_segments(struct the_nilfs *, struct nilfs_argv *,
void **);
/* inode.c */
void nilfs_inode_add_blocks(struct inode *inode, int n);
void nilfs_inode_sub_blocks(struct inode *inode, int n);
extern struct inode *nilfs_new_inode(struct inode *, umode_t);
extern int nilfs_get_block(struct inode *, sector_t, struct buffer_head *, int);
extern void nilfs_set_inode_flags(struct inode *);
extern int nilfs_read_inode_common(struct inode *, struct nilfs_inode *);
void nilfs_write_inode_common(struct inode *inode,
struct nilfs_inode *raw_inode);
struct inode *nilfs_ilookup(struct super_block *sb, struct nilfs_root *root,
unsigned long ino);
struct inode *nilfs_iget_locked(struct super_block *sb, struct nilfs_root *root,
unsigned long ino);
struct inode *nilfs_iget(struct super_block *sb, struct nilfs_root *root,
unsigned long ino);
extern struct inode *nilfs_iget_for_gc(struct super_block *sb,
unsigned long ino, __u64 cno);
int nilfs_attach_btree_node_cache(struct inode *inode);
void nilfs_detach_btree_node_cache(struct inode *inode);
struct inode *nilfs_iget_for_shadow(struct inode *inode);
extern void nilfs_update_inode(struct inode *, struct buffer_head *, int);
extern void nilfs_truncate(struct inode *);
extern void nilfs_evict_inode(struct inode *);
extern int nilfs_setattr(struct mnt_idmap *, struct dentry *,
struct iattr *);
extern void nilfs_write_failed(struct address_space *mapping, loff_t to);
int nilfs_permission(struct mnt_idmap *idmap, struct inode *inode,
int mask);
int nilfs_load_inode_block(struct inode *inode, struct buffer_head **pbh);
extern int nilfs_inode_dirty(struct inode *);
int nilfs_set_file_dirty(struct inode *inode, unsigned int nr_dirty);
extern int __nilfs_mark_inode_dirty(struct inode *, int);
extern void nilfs_dirty_inode(struct inode *, int flags);
int nilfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len);
static inline int nilfs_mark_inode_dirty(struct inode *inode)
{
return __nilfs_mark_inode_dirty(inode, I_DIRTY);
}
static inline int nilfs_mark_inode_dirty_sync(struct inode *inode)
{
return __nilfs_mark_inode_dirty(inode, I_DIRTY_SYNC);
}
/* super.c */
extern struct inode *nilfs_alloc_inode(struct super_block *);
__printf(2, 3)
void __nilfs_msg(struct super_block *sb, const char *fmt, ...);
extern __printf(3, 4)
void __nilfs_error(struct super_block *sb, const char *function,
const char *fmt, ...);
#ifdef CONFIG_PRINTK
#define nilfs_msg(sb, level, fmt, ...) \
__nilfs_msg(sb, level fmt, ##__VA_ARGS__)
#define nilfs_error(sb, fmt, ...) \
__nilfs_error(sb, __func__, fmt, ##__VA_ARGS__)
#else
#define nilfs_msg(sb, level, fmt, ...) \
do { \
no_printk(level fmt, ##__VA_ARGS__); \
(void)(sb); \
} while (0)
#define nilfs_error(sb, fmt, ...) \
do { \
no_printk(fmt, ##__VA_ARGS__); \
__nilfs_error(sb, "", " "); \
} while (0)
#endif /* CONFIG_PRINTK */
#define nilfs_crit(sb, fmt, ...) \
nilfs_msg(sb, KERN_CRIT, fmt, ##__VA_ARGS__)
#define nilfs_err(sb, fmt, ...) \
nilfs_msg(sb, KERN_ERR, fmt, ##__VA_ARGS__)
#define nilfs_warn(sb, fmt, ...) \
nilfs_msg(sb, KERN_WARNING, fmt, ##__VA_ARGS__)
#define nilfs_info(sb, fmt, ...) \
nilfs_msg(sb, KERN_INFO, fmt, ##__VA_ARGS__)
extern struct nilfs_super_block *
nilfs_read_super_block(struct super_block *, u64, int, struct buffer_head **);
extern int nilfs_store_magic(struct super_block *sb,
struct nilfs_super_block *sbp);
extern int nilfs_check_feature_compatibility(struct super_block *,
struct nilfs_super_block *);
extern void nilfs_set_log_cursor(struct nilfs_super_block *,
struct the_nilfs *);
struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
int flip);
int nilfs_commit_super(struct super_block *sb, int flag);
int nilfs_cleanup_super(struct super_block *sb);
int nilfs_resize_fs(struct super_block *sb, __u64 newsize);
int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
struct nilfs_root **root);
int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno);
/* gcinode.c */
int nilfs_gccache_submit_read_data(struct inode *, sector_t, sector_t, __u64,
struct buffer_head **);
int nilfs_gccache_submit_read_node(struct inode *, sector_t, __u64,
struct buffer_head **);
int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *);
int nilfs_init_gcinode(struct inode *inode);
void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs);
/* sysfs.c */
int __init nilfs_sysfs_init(void);
void nilfs_sysfs_exit(void);
int nilfs_sysfs_create_device_group(struct super_block *);
void nilfs_sysfs_delete_device_group(struct the_nilfs *);
int nilfs_sysfs_create_snapshot_group(struct nilfs_root *);
void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *);
/*
* Inodes and files operations
*/
extern const struct file_operations nilfs_dir_operations;
extern const struct inode_operations nilfs_file_inode_operations;
extern const struct file_operations nilfs_file_operations;
extern const struct address_space_operations nilfs_aops;
extern const struct inode_operations nilfs_dir_inode_operations;
extern const struct inode_operations nilfs_special_inode_operations;
extern const struct inode_operations nilfs_symlink_inode_operations;
/*
* filesystem type
*/
extern struct file_system_type nilfs_fs_type;
#endif /* _NILFS_H */
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