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34 lines
953 B
34 lines
953 B
6 years ago
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/* lfiballoc.c - lfiballoc */
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#include <xinu.h>
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/*------------------------------------------------------------------------
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* lfiballoc - Allocate a new index block from free list on disk
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* (assumes directory mutex held)
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*------------------------------------------------------------------------
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*/
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ibid32 lfiballoc (void)
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{
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ibid32 ibnum; /* ID of next block on the free list */
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struct lfiblk iblock; /* Buffer to hold an index block */
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/* Get ID of first index block on free list */
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ibnum = Lf_data.lf_dir.lfd_ifree;
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if (ibnum == LF_INULL) { /* Ran out of free index blocks */
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panic("out of index blocks");
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}
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lfibget(Lf_data.lf_dskdev, ibnum, &iblock);
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/* Unlink index block from the directory free list */
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Lf_data.lf_dir.lfd_ifree = iblock.ib_next;
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/* Write a copy of the directory to disk after the change */
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write(Lf_data.lf_dskdev, (char *) &Lf_data.lf_dir, LF_AREA_DIR);
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Lf_data.lf_dirdirty = FALSE;
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return ibnum;
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}
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