udf_i.h

Go to the documentation of this file.

#ifndef _UDF_I_H
#define _UDF_I_H

/*
 * The i_data_sem and i_mutex serve for protection of allocation information
 * of a regular files and symlinks. This includes all extents belonging to
 * the file/symlink, a fact whether data are in-inode or in external data
 * blocks, preallocation, goal block information... When extents are read,
 * i_mutex or i_data_sem must be held (for reading is enough in case of
 * i_data_sem). When extents are changed, i_data_sem must be held for writing
 * and also i_mutex must be held.
 *
 * For directories i_mutex is used for all the necessary protection.
 */

struct udf_inode_info {
    struct timespec     i_crtime;
    /* Physical address of inode */
    struct kernel_lb_addr       i_location;
    __u64           i_unique;
    __u32           i_lenEAttr;
    __u32           i_lenAlloc;
    __u64           i_lenExtents;
    __u32           i_next_alloc_block;
    __u32           i_next_alloc_goal;
    __u32           i_checkpoint;
    unsigned        i_alloc_type : 3;
    unsigned        i_efe : 1;  /* extendedFileEntry */
    unsigned        i_use : 1;  /* unallocSpaceEntry */
    unsigned        i_strat4096 : 1;
    unsigned        reserved : 26;
    union {
        struct short_ad *i_sad;
        struct long_ad      *i_lad;
        __u8        *i_data;
    } i_ext;
    struct rw_semaphore i_data_sem;
    struct inode vfs_inode;
};

static inline struct udf_inode_info *UDF_I(struct inode *inode)
{
    return list_entry(inode, struct udf_inode_info, vfs_inode);
}

#endif /* _UDF_I_H) */