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
81 lines
1.6 KiB
C
81 lines
1.6 KiB
C
#include "inc.h"
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void free_extent(struct dir_extent *e) {
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if (e == NULL)
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return;
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free_extent(e->next);
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free(e);
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}
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/* Free the contents of an inode dir entry, but not the pointer itself. */
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void free_inode_dir_entry(struct inode_dir_entry *e) {
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if (e == NULL)
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return;
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free(e->r_name);
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e->r_name = NULL;
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}
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struct buf* read_extent_block(struct dir_extent *e, size_t block) {
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size_t block_id = get_extent_absolute_block_id(e, block);
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struct buf *bp;
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if (block_id == 0 || block_id >= v_pri.volume_space_size_l)
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return NULL;
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if(lmfs_get_block(&bp, fs_dev, block_id, NORMAL) != OK)
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return NULL;
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return bp;
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}
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size_t get_extent_absolute_block_id(struct dir_extent *e, size_t block) {
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size_t extent_offset = 0;
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block /= v_pri.logical_block_size_l;
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if (e == NULL)
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return 0;
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/* Retrieve the extent on which the block lies. */
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while(block >= extent_offset + e->length) {
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if (e->next == NULL)
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return 0;
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extent_offset += e->length;
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e = e->next;
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}
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return e->location + block - extent_offset;
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}
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time_t date7_to_time_t(const u8_t *date) {
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/*
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* This function converts from the ISO 9660 7-byte time format to a
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* time_t.
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*/
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struct tm ltime;
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signed char time_zone = (signed char)date[6];
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ltime.tm_year = date[0];
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ltime.tm_mon = date[1] - 1;
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ltime.tm_mday = date[2];
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ltime.tm_hour = date[3];
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ltime.tm_min = date[4];
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ltime.tm_sec = date[5];
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ltime.tm_isdst = 0;
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/* Offset from Greenwich Mean Time */
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if (time_zone >= -52 && time_zone <= 52)
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ltime.tm_hour += time_zone;
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return mktime(<ime);
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}
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void* alloc_mem(size_t s) {
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void *ptr = calloc(1, s);
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assert(ptr != NULL);
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return ptr;
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}
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