WebSVN – HelenOS – Diff – /branches/dynload/uspace/srv/fs/fat/fat_idx.c



 
#include "fat.h"
#include "../../vfs/vfs.h"
#include <errno.h>
#include <string.h>
#include <adt/hash_table.h>
#include <adt/list.h>
#include <assert.h>
#include <fibril_sync.h>
 
/** Each instance of this type describes one interval of freed VFS indices. */
typedef struct {
    link_t      link;
    fs_index_t  first;

 
    /** Sorted list of intervals of freed indices. */
    link_t      freed_head;
} unused_t;
 
/** Mutex protecting the list of unused structures. */
static FIBRIL_MUTEX_INITIALIZE(unused_lock);
 
/** List of unused structures. */
static LIST_INITIALIZE(unused_head);
 
static void unused_initialize(unused_t *u, dev_handle_t dev_handle)

{
    unused_t *u;
    link_t *l;
 
    if (lock)
        fibril_mutex_lock(&unused_lock);
    for (l = unused_head.next; l != &unused_head; l = l->next) {
        u = list_get_instance(l, unused_t, link);
        if (u->dev_handle == dev_handle)
            return u;
    }
    if (lock)
        fibril_mutex_unlock(&unused_lock);
    return NULL;
}
 
/** Mutex protecting the up_hash and ui_hash. */
static FIBRIL_MUTEX_INITIALIZE(used_lock);
 
/**
 * Global hash table of all used fat_idx_t structures.
 * The index structures are hashed by the dev_handle, parent node's first
 * cluster and index within the parent directory.

             * There are no freed indices, allocate one directly
             * from the counter.
             */
            *index = u->next++;
            --u->remaining;
            fibril_mutex_unlock(&unused_lock);
            return true;
        }
    } else {
        /* There are some freed indices which we can reuse. */
        freed_t *f = list_get_instance(u->freed_head.next, freed_t,

        if (f->first++ == f->last) {
            /* Destroy the interval. */
            list_remove(&f->link);
            free(f);
        }
        fibril_mutex_unlock(&unused_lock);
        return true;
    }
    /*
     * We ran out of indices, which is extremely unlikely with FAT16, but
     * theoretically still possible (e.g. too many open unlinked nodes or
     * too many zero-sized nodes).
     */
    fibril_mutex_unlock(&unused_lock);
    return false;
}
 
/** If possible, coalesce two intervals of freed indices. */
static void try_coalesce_intervals(link_t *l, link_t *r, link_t *cur)

            if (f->first == index + 1) {
                f->first--;
                if (lnk->prev != &u->freed_head)
                    try_coalesce_intervals(lnk->prev, lnk,
                        lnk);
                fibril_mutex_unlock(&unused_lock);
                return;
            }
            if (f->last == index - 1) {
                f->last++;
                if (lnk->next != &u->freed_head)
                    try_coalesce_intervals(lnk, lnk->next,
                        lnk);
                fibril_mutex_unlock(&unused_lock);
                return;
            }
            if (index > f->first) {
                n = malloc(sizeof(freed_t));
                /* TODO: sleep until allocation succeeds */
                assert(n);
                link_initialize(&n->link);
                n->first = index;
                n->last = index;
                list_insert_before(&n->link, lnk);
                fibril_mutex_unlock(&unused_lock);
                return;
            }
 
        }
        /* The index will form the last interval. */

        link_initialize(&n->link);
        n->first = index;
        n->last = index;
        list_append(&n->link, &u->freed_head);
    }
    fibril_mutex_unlock(&unused_lock);
}
 
static fat_idx_t *fat_idx_create(dev_handle_t dev_handle)
{
    fat_idx_t *fidx;

        return NULL;
    }
       
    link_initialize(&fidx->uph_link);
    link_initialize(&fidx->uih_link);
    fibril_mutex_initialize(&fidx->lock);
    fidx->dev_handle = dev_handle;
    fidx->pfc = FAT_CLST_RES0;  /* no parent yet */
    fidx->pdi = 0;
    fidx->nodep = NULL;
 

 
fat_idx_t *fat_idx_get_new(dev_handle_t dev_handle)
{
    fat_idx_t *fidx;
 
    fibril_mutex_lock(&used_lock);
    fidx = fat_idx_create(dev_handle);
    if (!fidx) {
        fibril_mutex_unlock(&used_lock);
        return NULL;
    }
       
    unsigned long ikey[] = {
        [UIH_DH_KEY] = dev_handle,
        [UIH_INDEX_KEY] = fidx->index,
    };
   
    hash_table_insert(&ui_hash, ikey, &fidx->uih_link);
    fibril_mutex_lock(&fidx->lock);
    fibril_mutex_unlock(&used_lock);
 
    return fidx;
}
 
fat_idx_t *

        [UPH_DH_KEY] = dev_handle,
        [UPH_PFC_KEY] = pfc,
        [UPH_PDI_KEY] = pdi,
    };
 
    fibril_mutex_lock(&used_lock);
    l = hash_table_find(&up_hash, pkey);
    if (l) {
        fidx = hash_table_get_instance(l, fat_idx_t, uph_link);
    } else {
        fidx = fat_idx_create(dev_handle);
        if (!fidx) {
            fibril_mutex_unlock(&used_lock);
            return NULL;
        }
       
        unsigned long ikey[] = {
            [UIH_DH_KEY] = dev_handle,

        fidx->pdi = pdi;
 
        hash_table_insert(&up_hash, pkey, &fidx->uph_link);
        hash_table_insert(&ui_hash, ikey, &fidx->uih_link);
    }
    fibril_mutex_lock(&fidx->lock);
    fibril_mutex_unlock(&used_lock);
 
    return fidx;
}
 
void fat_idx_hashin(fat_idx_t *idx)

        [UPH_DH_KEY] = idx->dev_handle,
        [UPH_PFC_KEY] = idx->pfc,
        [UPH_PDI_KEY] = idx->pdi,
    };
 
    fibril_mutex_lock(&used_lock);
    hash_table_insert(&up_hash, pkey, &idx->uph_link);
    fibril_mutex_unlock(&used_lock);
}
 
void fat_idx_hashout(fat_idx_t *idx)
{
    unsigned long pkey[] = {
        [UPH_DH_KEY] = idx->dev_handle,
        [UPH_PFC_KEY] = idx->pfc,
        [UPH_PDI_KEY] = idx->pdi,
    };
 
    fibril_mutex_lock(&used_lock);
    hash_table_remove(&up_hash, pkey, 3);
    fibril_mutex_unlock(&used_lock);
}
 
fat_idx_t *
fat_idx_get_by_index(dev_handle_t dev_handle, fs_index_t index)
{

    unsigned long ikey[] = {
        [UIH_DH_KEY] = dev_handle,
        [UIH_INDEX_KEY] = index,
    };
 
    fibril_mutex_lock(&used_lock);
    l = hash_table_find(&ui_hash, ikey);
    if (l) {
        fidx = hash_table_get_instance(l, fat_idx_t, uih_link);
        fibril_mutex_lock(&fidx->lock);
    }
    fibril_mutex_unlock(&used_lock);
 
    return fidx;
}
 
/** Destroy the index structure.

        [UIH_INDEX_KEY] = idx->index,
    };
 
    assert(idx->pfc == FAT_CLST_RES0);
 
    fibril_mutex_lock(&used_lock);
    /*
     * Since we can only free unlinked nodes, the index structure is not
     * present in the position hash (uph). We therefore hash it out from
     * the index hash only.
     */
    hash_table_remove(&ui_hash, ikey, 2);
    fibril_mutex_unlock(&used_lock);
    /* Release the VFS index. */
    fat_index_free(idx->dev_handle, idx->index);
    /* Deallocate the structure. */
    free(idx);
}

 
    u = (unused_t *) malloc(sizeof(unused_t));
    if (!u)
        return ENOMEM;
    unused_initialize(u, dev_handle);
    fibril_mutex_lock(&unused_lock);
    if (!unused_find(dev_handle, false))
        list_append(&u->link, &unused_head);
    else
        rc = EEXIST;
    fibril_mutex_unlock(&unused_lock);
    return rc;
}
 
void fat_idx_fini_by_dev_handle(dev_handle_t dev_handle)
{
    unused_t *u;
 
    u = unused_find(dev_handle, true);
    assert(u);
    list_remove(&u->link);
    fibril_mutex_unlock(&unused_lock);
 
    while (!list_empty(&u->freed_head)) {
        freed_t *f;
        f = list_get_instance(u->freed_head.next, freed_t, link);
        list_remove(&f->link);

Rev 3674	Rev 4691
Line 37...	Line 37...
37		37
38	#include "fat.h"	38	#include "fat.h"
39	#include "../../vfs/vfs.h"	39	#include "../../vfs/vfs.h"
40	#include <errno.h>	40	#include <errno.h>
41	#include <string.h>	41	#include <string.h>
42	#include <libadt/hash_table.h>	42	#include <adt/hash_table.h>
43	#include <libadt/list.h>	43	#include <adt/list.h>
44	#include <assert.h>	44	#include <assert.h>
45	#include <futex.h>	45	#include <fibril_sync.h>
46		46
47	/** Each instance of this type describes one interval of freed VFS indices. */	47	/** Each instance of this type describes one interval of freed VFS indices. */
48	typedef struct {	48	typedef struct {
49	link_t link;	49	link_t link;
50	fs_index_t first;	50	fs_index_t first;
Line 66...	Line 66...
66		66
67	/** Sorted list of intervals of freed indices. */	67	/** Sorted list of intervals of freed indices. */
68	link_t freed_head;	68	link_t freed_head;
69	} unused_t;	69	} unused_t;
70		70
71	/** Futex protecting the list of unused structures. */	71	/** Mutex protecting the list of unused structures. */
72	static futex_t unused_futex = FUTEX_INITIALIZER;	72	static FIBRIL_MUTEX_INITIALIZE(unused_lock);
73		73
74	/** List of unused structures. */	74	/** List of unused structures. */
75	static LIST_INITIALIZE(unused_head);	75	static LIST_INITIALIZE(unused_head);
76		76
77	static void unused_initialize(unused_t *u, dev_handle_t dev_handle)	77	static void unused_initialize(unused_t *u, dev_handle_t dev_handle)
Line 87...	Line 87...
87	{	87	{
88	unused_t *u;	88	unused_t *u;
89	link_t *l;	89	link_t *l;
90		90
91	if (lock)	91	if (lock)
92	futex_down(&unused_futex);	92	fibril_mutex_lock(&unused_lock);
93	for (l = unused_head.next; l != &unused_head; l = l->next) {	93	for (l = unused_head.next; l != &unused_head; l = l->next) {
94	u = list_get_instance(l, unused_t, link);	94	u = list_get_instance(l, unused_t, link);
95	if (u->dev_handle == dev_handle)	95	if (u->dev_handle == dev_handle)
96	return u;	96	return u;
97	}	97	}
98	if (lock)	98	if (lock)
99	futex_up(&unused_futex);	99	fibril_mutex_unlock(&unused_lock);
100	return NULL;	100	return NULL;
101	}	101	}
102		102
103	/** Futex protecting the up_hash and ui_hash. */	103	/** Mutex protecting the up_hash and ui_hash. */
104	static futex_t used_futex = FUTEX_INITIALIZER;	104	static FIBRIL_MUTEX_INITIALIZE(used_lock);
105		105
106	/**	106	/**
107	* Global hash table of all used fat_idx_t structures.	107	* Global hash table of all used fat_idx_t structures.
108	* The index structures are hashed by the dev_handle, parent node's first	108	* The index structures are hashed by the dev_handle, parent node's first
109	* cluster and index within the parent directory.	109	* cluster and index within the parent directory.
Line 229...	Line 229...
229	* There are no freed indices, allocate one directly	229	* There are no freed indices, allocate one directly
230	* from the counter.	230	* from the counter.
231	*/	231	*/
232	*index = u->next++;	232	*index = u->next++;
233	--u->remaining;	233	--u->remaining;
234	futex_up(&unused_futex);	234	fibril_mutex_unlock(&unused_lock);
235	return true;	235	return true;
236	}	236	}
237	} else {	237	} else {
238	/* There are some freed indices which we can reuse. */	238	/* There are some freed indices which we can reuse. */
239	freed_t *f = list_get_instance(u->freed_head.next, freed_t,	239	freed_t *f = list_get_instance(u->freed_head.next, freed_t,
Line 242...	Line 242...
242	if (f->first++ == f->last) {	242	if (f->first++ == f->last) {
243	/* Destroy the interval. */	243	/* Destroy the interval. */
244	list_remove(&f->link);	244	list_remove(&f->link);
245	free(f);	245	free(f);
246	}	246	}
247	futex_up(&unused_futex);	247	fibril_mutex_unlock(&unused_lock);
248	return true;	248	return true;
249	}	249	}
250	/*	250	/*
251	* We ran out of indices, which is extremely unlikely with FAT16, but	251	* We ran out of indices, which is extremely unlikely with FAT16, but
252	* theoretically still possible (e.g. too many open unlinked nodes or	252	* theoretically still possible (e.g. too many open unlinked nodes or
253	* too many zero-sized nodes).	253	* too many zero-sized nodes).
254	*/	254	*/
255	futex_up(&unused_futex);	255	fibril_mutex_unlock(&unused_lock);
256	return false;	256	return false;
257	}	257	}
258		258
259	/** If possible, coalesce two intervals of freed indices. */	259	/** If possible, coalesce two intervals of freed indices. */
260	static void try_coalesce_intervals(link_t l, link_t r, link_t *cur)	260	static void try_coalesce_intervals(link_t l, link_t r, link_t *cur)
Line 300...	Line 300...
300	if (f->first == index + 1) {	300	if (f->first == index + 1) {
301	f->first--;	301	f->first--;
302	if (lnk->prev != &u->freed_head)	302	if (lnk->prev != &u->freed_head)
303	try_coalesce_intervals(lnk->prev, lnk,	303	try_coalesce_intervals(lnk->prev, lnk,
304	lnk);	304	lnk);
305	futex_up(&unused_futex);	305	fibril_mutex_unlock(&unused_lock);
306	return;	306	return;
307	}	307	}
308	if (f->last == index - 1) {	308	if (f->last == index - 1) {
309	f->last++;	309	f->last++;
310	if (lnk->next != &u->freed_head)	310	if (lnk->next != &u->freed_head)
311	try_coalesce_intervals(lnk, lnk->next,	311	try_coalesce_intervals(lnk, lnk->next,
312	lnk);	312	lnk);
313	futex_up(&unused_futex);	313	fibril_mutex_unlock(&unused_lock);
314	return;	314	return;
315	}	315	}
316	if (index > f->first) {	316	if (index > f->first) {
317	n = malloc(sizeof(freed_t));	317	n = malloc(sizeof(freed_t));
318	/* TODO: sleep until allocation succeeds */	318	/* TODO: sleep until allocation succeeds */
319	assert(n);	319	assert(n);
320	link_initialize(&n->link);	320	link_initialize(&n->link);
321	n->first = index;	321	n->first = index;
322	n->last = index;	322	n->last = index;
323	list_insert_before(&n->link, lnk);	323	list_insert_before(&n->link, lnk);
324	futex_up(&unused_futex);	324	fibril_mutex_unlock(&unused_lock);
325	return;	325	return;
326	}	326	}
327		327
328	}	328	}
329	/* The index will form the last interval. */	329	/* The index will form the last interval. */
Line 333...	Line 333...
333	link_initialize(&n->link);	333	link_initialize(&n->link);
334	n->first = index;	334	n->first = index;
335	n->last = index;	335	n->last = index;
336	list_append(&n->link, &u->freed_head);	336	list_append(&n->link, &u->freed_head);
337	}	337	}
338	futex_up(&unused_futex);	338	fibril_mutex_unlock(&unused_lock);
339	}	339	}
340		340
341	static fat_idx_t *fat_idx_create(dev_handle_t dev_handle)	341	static fat_idx_t *fat_idx_create(dev_handle_t dev_handle)
342	{	342	{
343	fat_idx_t *fidx;	343	fat_idx_t *fidx;
Line 350...	Line 350...
350	return NULL;	350	return NULL;
351	}	351	}
352		352
353	link_initialize(&fidx->uph_link);	353	link_initialize(&fidx->uph_link);
354	link_initialize(&fidx->uih_link);	354	link_initialize(&fidx->uih_link);
355	futex_initialize(&fidx->lock, 1);	355	fibril_mutex_initialize(&fidx->lock);
356	fidx->dev_handle = dev_handle;	356	fidx->dev_handle = dev_handle;
357	fidx->pfc = FAT_CLST_RES0; /* no parent yet */	357	fidx->pfc = FAT_CLST_RES0; /* no parent yet */
358	fidx->pdi = 0;	358	fidx->pdi = 0;
359	fidx->nodep = NULL;	359	fidx->nodep = NULL;
360		360
Line 363...	Line 363...
363		363
364	fat_idx_t *fat_idx_get_new(dev_handle_t dev_handle)	364	fat_idx_t *fat_idx_get_new(dev_handle_t dev_handle)
365	{	365	{
366	fat_idx_t *fidx;	366	fat_idx_t *fidx;
367		367
368	futex_down(&used_futex);	368	fibril_mutex_lock(&used_lock);
369	fidx = fat_idx_create(dev_handle);	369	fidx = fat_idx_create(dev_handle);
370	if (!fidx) {	370	if (!fidx) {
371	futex_up(&used_futex);	371	fibril_mutex_unlock(&used_lock);
372	return NULL;	372	return NULL;
373	}	373	}
374		374
375	unsigned long ikey[] = {	375	unsigned long ikey[] = {
376	[UIH_DH_KEY] = dev_handle,	376	[UIH_DH_KEY] = dev_handle,
377	[UIH_INDEX_KEY] = fidx->index,	377	[UIH_INDEX_KEY] = fidx->index,
378	};	378	};
379		379
380	hash_table_insert(&ui_hash, ikey, &fidx->uih_link);	380	hash_table_insert(&ui_hash, ikey, &fidx->uih_link);
381	futex_down(&fidx->lock);	381	fibril_mutex_lock(&fidx->lock);
382	futex_up(&used_futex);	382	fibril_mutex_unlock(&used_lock);
383		383
384	return fidx;	384	return fidx;
385	}	385	}
386		386
387	fat_idx_t *	387	fat_idx_t *
Line 393...	Line 393...
393	[UPH_DH_KEY] = dev_handle,	393	[UPH_DH_KEY] = dev_handle,
394	[UPH_PFC_KEY] = pfc,	394	[UPH_PFC_KEY] = pfc,
395	[UPH_PDI_KEY] = pdi,	395	[UPH_PDI_KEY] = pdi,
396	};	396	};
397		397
398	futex_down(&used_futex);	398	fibril_mutex_lock(&used_lock);
399	l = hash_table_find(&up_hash, pkey);	399	l = hash_table_find(&up_hash, pkey);
400	if (l) {	400	if (l) {
401	fidx = hash_table_get_instance(l, fat_idx_t, uph_link);	401	fidx = hash_table_get_instance(l, fat_idx_t, uph_link);
402	} else {	402	} else {
403	fidx = fat_idx_create(dev_handle);	403	fidx = fat_idx_create(dev_handle);
404	if (!fidx) {	404	if (!fidx) {
405	futex_up(&used_futex);	405	fibril_mutex_unlock(&used_lock);
406	return NULL;	406	return NULL;
407	}	407	}
408		408
409	unsigned long ikey[] = {	409	unsigned long ikey[] = {
410	[UIH_DH_KEY] = dev_handle,	410	[UIH_DH_KEY] = dev_handle,
Line 415...	Line 415...
415	fidx->pdi = pdi;	415	fidx->pdi = pdi;
416		416
417	hash_table_insert(&up_hash, pkey, &fidx->uph_link);	417	hash_table_insert(&up_hash, pkey, &fidx->uph_link);
418	hash_table_insert(&ui_hash, ikey, &fidx->uih_link);	418	hash_table_insert(&ui_hash, ikey, &fidx->uih_link);
419	}	419	}
420	futex_down(&fidx->lock);	420	fibril_mutex_lock(&fidx->lock);
421	futex_up(&used_futex);	421	fibril_mutex_unlock(&used_lock);
422		422
423	return fidx;	423	return fidx;
424	}	424	}
425		425
426	void fat_idx_hashin(fat_idx_t *idx)	426	void fat_idx_hashin(fat_idx_t *idx)
Line 429...	Line 429...
429	[UPH_DH_KEY] = idx->dev_handle,	429	[UPH_DH_KEY] = idx->dev_handle,
430	[UPH_PFC_KEY] = idx->pfc,	430	[UPH_PFC_KEY] = idx->pfc,
431	[UPH_PDI_KEY] = idx->pdi,	431	[UPH_PDI_KEY] = idx->pdi,
432	};	432	};
433		433
434	futex_down(&used_futex);	434	fibril_mutex_lock(&used_lock);
435	hash_table_insert(&up_hash, pkey, &idx->uph_link);	435	hash_table_insert(&up_hash, pkey, &idx->uph_link);
436	futex_up(&used_futex);	436	fibril_mutex_unlock(&used_lock);
437	}	437	}
438		438
439	void fat_idx_hashout(fat_idx_t *idx)	439	void fat_idx_hashout(fat_idx_t *idx)
440	{	440	{
441	unsigned long pkey[] = {	441	unsigned long pkey[] = {
442	[UPH_DH_KEY] = idx->dev_handle,	442	[UPH_DH_KEY] = idx->dev_handle,
443	[UPH_PFC_KEY] = idx->pfc,	443	[UPH_PFC_KEY] = idx->pfc,
444	[UPH_PDI_KEY] = idx->pdi,	444	[UPH_PDI_KEY] = idx->pdi,
445	};	445	};
446		446
447	futex_down(&used_futex);	447	fibril_mutex_lock(&used_lock);
448	hash_table_remove(&up_hash, pkey, 3);	448	hash_table_remove(&up_hash, pkey, 3);
449	futex_up(&used_futex);	449	fibril_mutex_unlock(&used_lock);
450	}	450	}
451		451
452	fat_idx_t *	452	fat_idx_t *
453	fat_idx_get_by_index(dev_handle_t dev_handle, fs_index_t index)	453	fat_idx_get_by_index(dev_handle_t dev_handle, fs_index_t index)
454	{	454	{
Line 457...	Line 457...
457	unsigned long ikey[] = {	457	unsigned long ikey[] = {
458	[UIH_DH_KEY] = dev_handle,	458	[UIH_DH_KEY] = dev_handle,
459	[UIH_INDEX_KEY] = index,	459	[UIH_INDEX_KEY] = index,
460	};	460	};
461		461
462	futex_down(&used_futex);	462	fibril_mutex_lock(&used_lock);
463	l = hash_table_find(&ui_hash, ikey);	463	l = hash_table_find(&ui_hash, ikey);
464	if (l) {	464	if (l) {
465	fidx = hash_table_get_instance(l, fat_idx_t, uih_link);	465	fidx = hash_table_get_instance(l, fat_idx_t, uih_link);
466	futex_down(&fidx->lock);	466	fibril_mutex_lock(&fidx->lock);
467	}	467	}
468	futex_up(&used_futex);	468	fibril_mutex_unlock(&used_lock);
469		469
470	return fidx;	470	return fidx;
471	}	471	}
472		472
473	/** Destroy the index structure.	473	/** Destroy the index structure.
Line 481...	Line 481...
481	[UIH_INDEX_KEY] = idx->index,	481	[UIH_INDEX_KEY] = idx->index,
482	};	482	};
483		483
484	assert(idx->pfc == FAT_CLST_RES0);	484	assert(idx->pfc == FAT_CLST_RES0);
485		485
486	futex_down(&used_futex);	486	fibril_mutex_lock(&used_lock);
487	/*	487	/*
488	* Since we can only free unlinked nodes, the index structure is not	488	* Since we can only free unlinked nodes, the index structure is not
489	* present in the position hash (uph). We therefore hash it out from	489	* present in the position hash (uph). We therefore hash it out from
490	* the index hash only.	490	* the index hash only.
491	*/	491	*/
492	hash_table_remove(&ui_hash, ikey, 2);	492	hash_table_remove(&ui_hash, ikey, 2);
493	futex_up(&used_futex);	493	fibril_mutex_unlock(&used_lock);
494	/* Release the VFS index. */	494	/* Release the VFS index. */
495	fat_index_free(idx->dev_handle, idx->index);	495	fat_index_free(idx->dev_handle, idx->index);
496	/* Deallocate the structure. */	496	/* Deallocate the structure. */
497	free(idx);	497	free(idx);
498	}	498	}
Line 522...	Line 522...
522		522
523	u = (unused_t *) malloc(sizeof(unused_t));	523	u = (unused_t *) malloc(sizeof(unused_t));
524	if (!u)	524	if (!u)
525	return ENOMEM;	525	return ENOMEM;
526	unused_initialize(u, dev_handle);	526	unused_initialize(u, dev_handle);
527	futex_down(&unused_futex);	527	fibril_mutex_lock(&unused_lock);
528	if (!unused_find(dev_handle, false))	528	if (!unused_find(dev_handle, false))
529	list_append(&u->link, &unused_head);	529	list_append(&u->link, &unused_head);
530	else	530	else
531	rc = EEXIST;	531	rc = EEXIST;
532	futex_up(&unused_futex);	532	fibril_mutex_unlock(&unused_lock);
533	return rc;	533	return rc;
534	}	534	}
535		535
536	void fat_idx_fini_by_dev_handle(dev_handle_t dev_handle)	536	void fat_idx_fini_by_dev_handle(dev_handle_t dev_handle)
537	{	537	{
538	unused_t *u;	538	unused_t *u;
539		539
540	u = unused_find(dev_handle, true);	540	u = unused_find(dev_handle, true);
541	assert(u);	541	assert(u);
542	list_remove(&u->link);	542	list_remove(&u->link);
543	futex_up(&unused_futex);	543	fibril_mutex_unlock(&unused_lock);
544		544
545	while (!list_empty(&u->freed_head)) {	545	while (!list_empty(&u->freed_head)) {
546	freed_t *f;	546	freed_t *f;
547	f = list_get_instance(u->freed_head.next, freed_t, link);	547	f = list_get_instance(u->freed_head.next, freed_t, link);
548	list_remove(&f->link);	548	list_remove(&f->link);

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(root)/branches/dynload/uspace/srv/fs/fat/fat_idx.c @ 3771 – Rev 3674 → 4691