LDD和scull相关各种结构体的故事(学习笔记 不定期更新)

LDD和各种结构体的故事

struct scull_dev     位置：scull/scull.h

struct scull_dev {struct scull_qset *data;  /* Pointer to first quantum set */int quantum;              /* the current quantum size */int qset;                 /* the current array size */unsigned long size;       /* amount of data stored here */unsigned int access_key;  /* used by sculluid and scullpriv */struct mutex mutex;     /* mutual exclusion semaphore     */struct cdev cdev;  /* Char device structure*/};

struct mutex       位置：/usr/src/linux-source/include/linux/

struct mutex {        /* 1: unlocked, 0: locked, negative: locked, possible waiters */        atomic_t                count;        spinlock_t              wait_lock;        struct list_head        wait_list;#if defined(CONFIG_DEBUG_MUTEXES) || defined(CONFIG_SMP)        struct task_struct      *owner;#endif#ifdef CONFIG_DEBUG_MUTEXES        const char              *name;        void                    *magic;#endif#ifdef CONFIG_DEBUG_LOCK_ALLOC        struct lockdep_map      dep_map;#endif};

这个有点点长哇。。。

struct inode    位置：/usr/src/linux-source/include/linux/fs.h

/* * Keep mostly read-only and often accessed (especially for * the RCU path lookup and 'stat' data) fields at the beginning * of the 'struct inode' */struct inode {        umode_t                 i_mode;        unsigned short          i_opflags;        kuid_t                  i_uid;        kgid_t                  i_gid;        unsigned int            i_flags;#ifdef CONFIG_FS_POSIX_ACL        struct posix_acl        *i_acl;        struct posix_acl        *i_default_acl;#endif        const struct inode_operations   *i_op;        struct super_block      *i_sb;        struct address_space    *i_mapping;#ifdef CONFIG_SECURITY        void                    *i_security;#endif        /* Stat data, not accessed from path walking */        unsigned long           i_ino;        /*         * Filesystems may only read i_nlink directly.  They shall use the         * following functions for modification:         *         *    (set|clear|inc|drop)_nlink         *    inode_(inc|dec)_link_count         */        union {                const unsigned int i_nlink;                unsigned int __i_nlink;        };        dev_t                   i_rdev;        loff_t                  i_size;        struct timespec         i_atime;        struct timespec         i_mtime;        struct timespec         i_ctime;        spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */        unsigned short          i_bytes;        unsigned int            i_blkbits;        blkcnt_t                i_blocks;#ifdef __NEED_I_SIZE_ORDERED        seqcount_t              i_size_seqcount;#endif        /* Misc */        unsigned long           i_state;        struct mutex            i_mutex;        unsigned long           dirtied_when;   /* jiffies of first dirtying */        struct hlist_node       i_hash;        struct list_head        i_wb_list;      /* backing dev IO list */        struct list_head        i_lru;          /* inode LRU list */        struct list_head        i_sb_list;        union {                struct hlist_head       i_dentry;                struct rcu_head         i_rcu;        };        u64                     i_version;        atomic_t                i_count;        atomic_t                i_dio_count;        atomic_t                i_writecount;        const struct file_operations    *i_fop; /* former ->i_op->default_file_ops */        struct file_lock        *i_flock;        struct address_space    i_data;#ifdef CONFIG_QUOTA        struct dquot            *i_dquot[MAXQUOTAS];#endif        struct list_head        i_devices;        union {                struct pipe_inode_info  *i_pipe;                struct block_device     *i_bdev;                struct cdev             *i_cdev;        };        __u32                   i_generation;#ifdef CONFIG_FSNOTIFY        __u32                   i_fsnotify_mask; /* all events this inode cares about */        struct hlist_head       i_fsnotify_marks;#endif#ifdef CONFIG_IMA        atomic_t                i_readcount; /* struct files open RO */#endif        void                    *i_private; /* fs or device private pointer */};

struct file      位置：/usr/src/linux-source/include/linux/fs.h

struct file {        /*         * fu_list becomes invalid after file_free is called and queued via         * fu_rcuhead for RCU freeing         */        union {                struct list_head        fu_list;                struct rcu_head         fu_rcuhead;        } f_u;        struct path             f_path;#define f_dentry        f_path.dentry#define f_vfsmnt        f_path.mnt        const struct file_operations    *f_op;        /*         * Protects f_ep_links, f_flags, f_pos vs i_size in lseek SEEK_CUR.         * Must not be taken from IRQ context.         */        spinlock_t              f_lock;#ifdef CONFIG_SMP        int                     f_sb_list_cpu;#endif        atomic_long_t           f_count;        unsigned int            f_flags;        fmode_t                 f_mode;        loff_t                  f_pos;        struct fown_struct      f_owner;        const struct cred       *f_cred;        struct file_ra_state    f_ra;        u64                     f_version;#ifdef CONFIG_SECURITY        void                    *f_security;#endif        /* needed for tty driver, and maybe others */        void                    *private_data;#ifdef CONFIG_EPOLL        /* Used by fs/eventpoll.c to link all the hooks to this file */        struct list_head        f_ep_links;        struct list_head        f_tfile_llink;#endif /* #ifdef CONFIG_EPOLL */        struct address_space    *f_mapping;#ifdef CONFIG_DEBUG_WRITECOUNT        unsigned long f_mnt_write_state;#endif};

struct cdev      位置：/usr/src/linux-source/include/linux/cdev.h

struct cdev {        struct kobject kobj;        struct module *owner;        const struct file_operations *ops;        struct list_head list;        dev_t dev;        unsigned int count;};

 

struct scull_qset                             位置：scull/scull.h

struct scull_qset {void **data;struct scull_qset *next;};

struct seq_file       位置：/usr/src/linux-source/include/linux/sqe_file.h

struct seq_file {        char *buf;        size_t size;        size_t from;        size_t count;        loff_t index;        loff_t read_pos;        u64 version;        struct mutex lock;        const struct seq_operations *op;        int poll_event;#ifdef CONFIG_USER_NS        struct user_namespace *user_ns;#endif        void *private;};

kmem_cache 

位置：/usr/src/linux-source/include/linux/slab.h

struct kmem_cache {unsigned int object_size;/* The original size of the object */unsigned int size;/* The aligned/padded/added on size  */unsigned int align;/* Alignment as calculated */unsigned long flags;/* Active flags on the slab */const char *name;/* Slab name for sysfs */int refcount;/* Use counter */void (*ctor)(void *);/* Called on object slot creation */struct list_head list;/* List of all slab caches on the system */};

poll_table

位置：/usr/src/linux-source/include/linux/poll.h

typedef struct poll_table_struct {poll_queue_proc _qproc;unsigned long _key;} poll_table;

work_struct

位置：/usr/src/linux-source/include/linux/workqueue.h

struct work_struct {atomic_long_t data;struct list_head entry;work_func_t func;#ifdef CONFIG_LOCKDEPstruct lockdep_map lockdep_map;#endif};

"也哭也笑，平凡着"

—— 平凡之路