b1d068470b
isofs now uses an in-memory directory listing built on-the-fly instead of parsing the ISO 9660 data structures over and over for almost every request. This yields huge performance improvements. The directory listing is allocated dynamically, but Minix servers aren't normally supposed to do that because critical servers would crash if the system runs out of memory. isofs is quite frugal, won't allocate memory after having the whole directory tree cached and is not that critical (its most important job is to serve as a root file system during installation). The benefits and elegance of this scheme far outweights this small problem in practice. Change-Id: I13d070388c07d274cbee0645cbc50295c447c5b6
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
#include "const.h"
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#include <sys/stat.h>
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struct iso9660_dir_record {
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/*
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* ISO standard directory record.
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*/
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u8_t length; /* The length of the record */
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u8_t ext_attr_rec_length;
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u32_t loc_extent_l; /* The same data (in this case loc_extent)is */
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u32_t loc_extent_m; /* saved in two ways. The first puts the le- */
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u32_t data_length_l; /* ast significant byte first, the second */
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u32_t data_length_m; /* does the opposite */
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u8_t rec_date[7]; /* => recording date */
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u8_t file_flags; /* => flags of the file */
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u8_t file_unit_size; /* set of blocks in interleave mode */
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u8_t inter_gap_size; /* gap between file units in interleave mode */
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u32_t vol_seq_number; /* volume sequence number: not used */
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u8_t length_file_id; /* Length name file */
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char file_id[ISO9660_MAX_FILE_ID_LEN]; /* file name */
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} __attribute__((packed));
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struct rrii_dir_record {
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/*
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* Rock Ridge directory record extensions.
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*/
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u8_t mtime[7]; /* stat.st_mtime */
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u8_t atime[7]; /* stat.st_atime */
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u8_t ctime[7]; /* stat.st_ctime */
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u8_t birthtime[7]; /* stat.st_birthtime */
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mode_t d_mode; /* file mode */
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uid_t uid; /* user ID of the file's owner */
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gid_t gid; /* group ID of the file's group */
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dev_t rdev; /* device major/minor */
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char file_id_rrip[ISO9660_RRIP_MAX_FILE_ID_LEN]; /* file name */
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char slink_rrip[ISO9660_RRIP_MAX_FILE_ID_LEN]; /* symbolic link */
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struct inode *reparented_inode;
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} ;
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struct dir_extent {
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/*
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* Extent (contiguous array of logical sectors).
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*/
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u32_t location;
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u32_t length;
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struct dir_extent *next;
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} ;
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struct inode_dir_entry {
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struct inode *i_node;
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char *name; /* Pointer to real name */
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char i_name[ISO9660_MAX_FILE_ID_LEN+1]; /* ISO 9660 name */
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char *r_name; /* Rock Ridge name */
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} ;
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struct inode {
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int i_count; /* usage counter of this inode */
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int i_refcount; /* reference counter of this inode */
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int i_mountpoint; /* flag for inode being used as a mount point */
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struct stat i_stat; /* inode properties */
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struct dir_extent extent; /* first extent of file */
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struct inode_dir_entry *dir_contents; /* contents of directory */
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size_t dir_size; /* number of inodes in this directory */
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char *s_name; /* Rock Ridge symbolic link */
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int skip; /* skip inode because of reparenting */
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} ;
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struct opt {
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/*
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* Global mount options.
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*/
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int norock; /* Bool: dont use Rock Ridge */
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} ;
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#define D_DIRECTORY 0x2
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#define D_NOT_LAST_EXTENT 0x80
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#define D_TYPE 0x8E
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