inode:
include/linux/fs.h
1 /*
2 * Keep mostly read-only and often accessed (especially for
3 * the RCU path lookup and ‘stat‘ data) fields at the beginning
4 * of the ‘struct inode‘
5 */
6 struct inode {
7 umode_t i_mode;
8 unsigned short i_opflags;
9 kuid_t i_uid;
10 kgid_t i_gid;
11 unsigned int i_flags;
12
13 #ifdef CONFIG_FS_POSIX_ACL
14 struct posix_acl *i_acl;
15 struct posix_acl *i_default_acl;
16 #endif
17
18 const struct inode_operations *i_op;
19 struct super_block *i_sb;
20 struct address_space *i_mapping;
21
22 #ifdef CONFIG_SECURITY
23 void *i_security;
24 #endif
25
26 /* Stat data, not accessed from path walking */
27 unsigned long i_ino;
28 /*
29 * Filesystems may only read i_nlink directly. They shall use the
30 * following functions for modification:
31 *
32 * (set|clear|inc|drop)_nlink
33 * inode_(inc|dec)_link_count
34 */
35 union {
36 const unsigned int i_nlink;
37 unsigned int __i_nlink;
38 };
39 dev_t i_rdev;
40 loff_t i_size;
41 struct timespec i_atime;
42 struct timespec i_mtime;
43 struct timespec i_ctime;
44 spinlock_t i_lock; /* i_blocks, i_bytes, maybe i_size */
45 unsigned short i_bytes;
46 unsigned int i_blkbits;
47 blkcnt_t i_blocks;
48
49 #ifdef __NEED_I_SIZE_ORDERED
50 seqcount_t i_size_seqcount;
51 #endif
52
53 /* Misc */
54 unsigned long i_state;
55 struct mutex i_mutex;
56
57 unsigned long dirtied_when; /* jiffies of first dirtying */
58
59 struct hlist_node i_hash;
60 struct list_head i_wb_list; /* backing dev IO list */
61 struct list_head i_lru; /* inode LRU list */
62 struct list_head i_sb_list;
63 union {
64 struct hlist_head i_dentry;
65 struct rcu_head i_rcu;
66 };
67 u64 i_version;
68 atomic_t i_count;
69 atomic_t i_dio_count;
70 atomic_t i_writecount;
71 #ifdef CONFIG_IMA
72 atomic_t i_readcount; /* struct files open RO */
73 #endif
74 const struct file_operations *i_fop; /* former ->i_op->default_file_ops */
75 struct file_lock_context *i_flctx;
76 struct address_space i_data;
77 struct list_head i_devices;
78 union {
79 struct pipe_inode_info *i_pipe;
80 struct block_device *i_bdev;
81 struct cdev *i_cdev;
82 };
83
84 __u32 i_generation;
85
86 #ifdef CONFIG_FSNOTIFY
87 __u32 i_fsnotify_mask; /* all events this inode cares about */
88 struct hlist_head i_fsnotify_marks;
89 #endif
90
91 void *i_private; /* fs or device private pointer */
92 };
file:
include/linux/fs.h
1 struct file {
2 union {
3 struct llist_node fu_llist;
4 struct rcu_head fu_rcuhead;
5 } f_u;
6 struct path f_path;
7 struct inode *f_inode; /* cached value */
8 const struct file_operations *f_op;
9
10 /*
11 * Protects f_ep_links, f_flags.
12 * Must not be taken from IRQ context.
13 */
14 spinlock_t f_lock;
15 atomic_long_t f_count;
16 unsigned int f_flags;
17 fmode_t f_mode;
18 struct mutex f_pos_lock;
19 loff_t f_pos;
20 struct fown_struct f_owner;
21 const struct cred *f_cred;
22 struct file_ra_state f_ra;
23
24 u64 f_version;
25 #ifdef CONFIG_SECURITY
26 void *f_security;
27 #endif
28 /* needed for tty driver, and maybe others */
29 void *private_data;
30
31 #ifdef CONFIG_EPOLL
32 /* Used by fs/eventpoll.c to link all the hooks to this file */
33 struct list_head f_ep_links;
34 struct list_head f_tfile_llink;
35 #endif /* #ifdef CONFIG_EPOLL */
36 struct address_space *f_mapping;
37 } __attribute__((aligned(4))); /* lest something weird decides that 2 is OK */
cdev
include/linux/cdev.h
1 struct cdev {
2 13 struct kobject kobj;
3 14 struct module *owner;
4 15 const struct file_operations *ops;
5 16 struct list_head list;
6 17 dev_t dev;
7 18 unsigned int count;
8 19 };
时间： 2024-12-16 15:31:12