Linux Driver Development Record

Inode:

Include/linux/fs.h

1 /*2 * Keep mostly read-only and often accessed (especially for3 * The RCU path lookup and ' stat ' data) fields at the beginning4 * of the ' struct Inode '5  */6 structInode {7 umode_t I_mode;8Unsigned Shorti_opflags;9 kuid_t I_uid;Ten kgid_t I_gid; OneUnsignedinti_flags; A  - #ifdef CONFIG_FS_POSIX_ACL -     structPosix_acl *I_acl; the     structPosix_acl *I_default_acl; - #endif -  -     Const structInode_operations *I_op; +     structSuper_block *I_SB; -     structAddress_space *i_mapping; +  A #ifdef config_security at     void*i_security; - #endif -  -     /*Stat data, not accessed from path walking*/ -UnsignedLongI_ino; -     /* in * filesystems may only read I_nlink directly. They shall use the - * Following functions for modification: to      * + * (set|clear|inc|drop) _nlink - * Inode_ (INC|DEC) _link_count the      */ * Union { $         ConstUnsignedintI_nlink;Panax NotoginsengUnsignedint__i_nlink; -     }; the dev_t I_rdev; + loff_t i_size; A     structTimespec i_atime; the     structTimespec i_mtime; +     structTimespec i_ctime; -spinlock_t I_lock;/*I_blocks, I_bytes, maybe I_size*/ $Unsigned Shorti_bytes; $Unsignedinti_blkbits; - blkcnt_t i_blocks; -  the #ifdef __need_i_size_ordered - seqcount_t I_size_seqcount;Wuyi #endif the  -     /*Misc*/ WuUnsignedLongi_state; -     structMutex I_mutex; About  $UnsignedLongDirtied_when;/*jiffies of First dirtying*/ -  -     structHlist_node I_hash; -     structList_head i_wb_list;/*backing Dev IO list*/ A     structList_head I_lru;/*inode LRU List*/ +     structList_head i_sb_list; the Union { -         structHlist_head i_dentry; $         structRcu_head I_rcu; the     }; the U64 i_version; the atomic_t I_count; the atomic_t I_dio_count; - atomic_t I_writecount; in #ifdef Config_ima theatomic_t I_readcount;/*struct files open RO*/ the #endif About     Const structFile_operations *i_fop;/*former->i_op->default_file_ops*/ the     structFile_lock_context *I_flctx; the     structaddress_space I_data; the     structList_head i_devices; + Union { -         structPipe_inode_info *I_pipe; the         structBlock_device *I_bdev;Bayi        struct cdev *i_cdev;  the     }; the  - __u32 i_generation; -  the #ifdef config_fsnotify the__u32 I_fsnotify_mask;/*All Events This inode cares about*/ the     structHlist_head I_fsnotify_marks; the #endif -  the     void*i_private;/*FS or device private pointer*/ the};

File

Include/linux/fs.h

1 structfile {2 Union {3         structLlist_node fu_llist;4         structRcu_head Fu_rcuhead;5 } F_u;6     structpath F_path;7      struct inode *f_inode; /* Cached Value */8      const struct file_operations *f_op; 9 Ten     /* One * Protects F_ep_links, f_flags. A * must not being taken from IRQ context. -      */ - spinlock_t F_lock; the atomic_long_t F_count; -Unsignedintf_flags; - fmode_t F_mode; -     structMutex F_pos_lock; + loff_t F_pos; -     structfown_struct F_owner; +     Const structCred *f_cred; A     structfile_ra_state F_ra; at  - U64 f_version; - #ifdef config_security -     void*f_security; - #endif -     /*needed for TTY driver, and maybe others*/ in      void *private_data;  -  to #ifdef Config_epoll +     /*used by fs/eventpoll.c to link all the hooks to this file*/ -     structList_head f_ep_links; the     structList_head F_tfile_llink; * #endif/* #ifdef Config_epoll */ $     structAddress_space *f_mapping;Panax Notoginseng} __attribute__ ((Aligned (4)));/*lest something weird decides that 2 is OK*/

Cdev

Include/linux/cdev.h

1  structCdev {2   -         structKobject kobj;3   -         structModule *owner;4   the         Const structFile_operations *ops;5   -         structlist_head list;6   -dev_t Dev;7   -Unsignedintcount;8   +};

Linux Driver Development Record