/**
* create fld cache.
*/
-struct fld_cache *fld_cache_init(const char *name,
- int cache_size, int cache_threshold)
+struct fld_cache *fld_cache_init(const char *name, int cache_size,
+ int cache_threshold)
{
- struct fld_cache *cache;
- ENTRY;
+ struct fld_cache *cache;
- LASSERT(name != NULL);
- LASSERT(cache_threshold < cache_size);
+ ENTRY;
+
+ LASSERT(name != NULL);
+ LASSERT(cache_threshold < cache_size);
- OBD_ALLOC_PTR(cache);
- if (cache == NULL)
- RETURN(ERR_PTR(-ENOMEM));
+ OBD_ALLOC_PTR(cache);
+ if (cache == NULL)
+ RETURN(ERR_PTR(-ENOMEM));
INIT_LIST_HEAD(&cache->fci_entries_head);
INIT_LIST_HEAD(&cache->fci_lru);
- cache->fci_cache_count = 0;
+ cache->fci_cache_count = 0;
rwlock_init(&cache->fci_lock);
- strlcpy(cache->fci_name, name,
- sizeof(cache->fci_name));
+ strlcpy(cache->fci_name, name, sizeof(cache->fci_name));
- cache->fci_cache_size = cache_size;
- cache->fci_threshold = cache_threshold;
+ cache->fci_cache_size = cache_size;
+ cache->fci_threshold = cache_threshold;
- /* Init fld cache info. */
- memset(&cache->fci_stat, 0, sizeof(cache->fci_stat));
+ /* Init fld cache info. */
+ memset(&cache->fci_stat, 0, sizeof(cache->fci_stat));
- CDEBUG(D_INFO, "%s: FLD cache - Size: %d, Threshold: %d\n",
- cache->fci_name, cache_size, cache_threshold);
+ CDEBUG(D_INFO, "%s: FLD cache - Size: %d, Threshold: %d\n",
+ cache->fci_name, cache_size, cache_threshold);
- RETURN(cache);
+ RETURN(cache);
}
/**
*/
static void fld_fix_new_list(struct fld_cache *cache)
{
- struct fld_cache_entry *f_curr;
- struct fld_cache_entry *f_next;
- struct lu_seq_range *c_range;
- struct lu_seq_range *n_range;
+ struct fld_cache_entry *f_curr;
+ struct fld_cache_entry *f_next;
+ struct lu_seq_range *c_range;
+ struct lu_seq_range *n_range;
struct list_head *head = &cache->fci_entries_head;
- ENTRY;
+
+ ENTRY;
restart_fixup:
if (c_range->lsr_flags != n_range->lsr_flags)
continue;
- LASSERTF(c_range->lsr_start <= n_range->lsr_start,
- "cur lsr_start "DRANGE" next lsr_start "DRANGE"\n",
- PRANGE(c_range), PRANGE(n_range));
-
- /* check merge possibility with next range */
- if (c_range->lsr_end == n_range->lsr_start) {
- if (c_range->lsr_index != n_range->lsr_index)
- continue;
- n_range->lsr_start = c_range->lsr_start;
- fld_cache_entry_delete(cache, f_curr);
- continue;
- }
-
- /* check if current range overlaps with next range. */
- if (n_range->lsr_start < c_range->lsr_end) {
- if (c_range->lsr_index == n_range->lsr_index) {
- n_range->lsr_start = c_range->lsr_start;
- n_range->lsr_end = max(c_range->lsr_end,
- n_range->lsr_end);
- fld_cache_entry_delete(cache, f_curr);
- } else {
- if (n_range->lsr_end <= c_range->lsr_end) {
- *n_range = *c_range;
- fld_cache_entry_delete(cache, f_curr);
- } else
- n_range->lsr_start = c_range->lsr_end;
- }
-
- /* we could have overlap over next
- * range too. better restart. */
- goto restart_fixup;
- }
-
- /* kill duplicates */
+ LASSERTF(c_range->lsr_start <= n_range->lsr_start,
+ "cur lsr_start "DRANGE" next lsr_start "DRANGE"\n",
+ PRANGE(c_range), PRANGE(n_range));
+
+ /* check merge possibility with next range */
+ if (c_range->lsr_end == n_range->lsr_start) {
+ if (c_range->lsr_index != n_range->lsr_index)
+ continue;
+ n_range->lsr_start = c_range->lsr_start;
+ fld_cache_entry_delete(cache, f_curr);
+ continue;
+ }
+
+ /* check if current range overlaps with next range. */
+ if (n_range->lsr_start < c_range->lsr_end) {
+ if (c_range->lsr_index == n_range->lsr_index) {
+ n_range->lsr_start = c_range->lsr_start;
+ n_range->lsr_end = max(c_range->lsr_end,
+ n_range->lsr_end);
+ fld_cache_entry_delete(cache, f_curr);
+ } else {
+ if (n_range->lsr_end <= c_range->lsr_end) {
+ *n_range = *c_range;
+ fld_cache_entry_delete(cache, f_curr);
+ } else
+ n_range->lsr_start = c_range->lsr_end;
+ }
+
+ /* we could have overlap over next
+ * range too. better restart.
+ */
+ goto restart_fixup;
+ }
+
+ /* kill duplicates */
if (c_range->lsr_start == n_range->lsr_start &&
c_range->lsr_end == n_range->lsr_end)
fld_cache_entry_delete(cache, f_curr);
- }
+ }
- EXIT;
+ EXIT;
}
/**
* add node to fld cache
*/
static inline void fld_cache_entry_add(struct fld_cache *cache,
- struct fld_cache_entry *f_new,
+ struct fld_cache_entry *f_new,
struct list_head *pos)
{
list_add(&f_new->fce_list, pos);
num++;
}
- CDEBUG(D_INFO, "%s: FLD cache - Shrunk by "
- "%d entries\n", cache->fci_name, num);
+ CDEBUG(D_INFO, "%s: FLD cache - Shrunk by %d entries\n",
+ cache->fci_name, num);
RETURN(0);
}
struct fld_cache_entry *f_curr,
struct fld_cache_entry *f_new)
{
- const struct lu_seq_range *range = &f_new->fce_range;
+ const struct lu_seq_range *range = &f_new->fce_range;
const u64 new_start = range->lsr_start;
const u64 new_end = range->lsr_end;
- struct fld_cache_entry *fldt;
-
- ENTRY;
- OBD_ALLOC_GFP(fldt, sizeof *fldt, GFP_ATOMIC);
- if (!fldt) {
- OBD_FREE_PTR(f_new);
- EXIT;
- /* overlap is not allowed, so dont mess up list. */
- return;
- }
- /* break f_curr RANGE into three RANGES:
- * f_curr, f_new , fldt
- */
-
- /* f_new = *range */
-
- /* fldt */
- fldt->fce_range.lsr_start = new_end;
- fldt->fce_range.lsr_end = f_curr->fce_range.lsr_end;
- fldt->fce_range.lsr_index = f_curr->fce_range.lsr_index;
-
- /* f_curr */
- f_curr->fce_range.lsr_end = new_start;
-
- /* add these two entries to list */
- fld_cache_entry_add(cache, f_new, &f_curr->fce_list);
- fld_cache_entry_add(cache, fldt, &f_new->fce_list);
-
- /* no need to fixup */
- EXIT;
+ struct fld_cache_entry *fldt;
+
+ ENTRY;
+ OBD_ALLOC_GFP(fldt, sizeof(*fldt), GFP_ATOMIC);
+ if (!fldt) {
+ OBD_FREE_PTR(f_new);
+ EXIT;
+ /* overlap is not allowed, so dont mess up list. */
+ return;
+ }
+ /* break f_curr RANGE into three RANGES:
+ * f_curr, f_new , fldt
+ */
+
+ /* fldt */
+ fldt->fce_range.lsr_start = new_end;
+ fldt->fce_range.lsr_end = f_curr->fce_range.lsr_end;
+ fldt->fce_range.lsr_index = f_curr->fce_range.lsr_index;
+
+ /* f_curr */
+ f_curr->fce_range.lsr_end = new_start;
+
+ /* add these two entries to list */
+ fld_cache_entry_add(cache, f_new, &f_curr->fce_list);
+ fld_cache_entry_add(cache, fldt, &f_new->fce_list);
+
+ /* no need to fixup */
+ EXIT;
}
/**
const u64 new_end = range->lsr_end;
const u32 mdt = range->lsr_index;
- /* this is overlap case, these case are checking overlapping with
- * prev range only. fixup will handle overlaping with next range. */
+ /* this is overlap case, these case are checking overlapping with
+ * prev range only. fixup will handle overlaping with next range.
+ */
- if (f_curr->fce_range.lsr_index == mdt) {
- f_curr->fce_range.lsr_start = min(f_curr->fce_range.lsr_start,
- new_start);
+ if (f_curr->fce_range.lsr_index == mdt) {
+ f_curr->fce_range.lsr_start = min(f_curr->fce_range.lsr_start,
+ new_start);
- f_curr->fce_range.lsr_end = max(f_curr->fce_range.lsr_end,
- new_end);
+ f_curr->fce_range.lsr_end = max(f_curr->fce_range.lsr_end,
+ new_end);
- OBD_FREE_PTR(f_new);
- fld_fix_new_list(cache);
+ OBD_FREE_PTR(f_new);
+ fld_fix_new_list(cache);
- } else if (new_start <= f_curr->fce_range.lsr_start &&
- f_curr->fce_range.lsr_end <= new_end) {
- /* case 1: new range completely overshadowed existing range.
- * e.g. whole range migrated. update fld cache entry */
+ } else if (new_start <= f_curr->fce_range.lsr_start &&
+ f_curr->fce_range.lsr_end <= new_end) {
+ /* case 1: new range completely overshadowed existing range.
+ * e.g. whole range migrated. update fld cache entry
+ */
- f_curr->fce_range = *range;
- OBD_FREE_PTR(f_new);
- fld_fix_new_list(cache);
+ f_curr->fce_range = *range;
+ OBD_FREE_PTR(f_new);
+ fld_fix_new_list(cache);
- } else if (f_curr->fce_range.lsr_start < new_start &&
- new_end < f_curr->fce_range.lsr_end) {
- /* case 2: new range fit within existing range. */
+ } else if (f_curr->fce_range.lsr_start < new_start &&
+ new_end < f_curr->fce_range.lsr_end) {
+ /* case 2: new range fit within existing range. */
- fld_cache_punch_hole(cache, f_curr, f_new);
+ fld_cache_punch_hole(cache, f_curr, f_new);
- } else if (new_end <= f_curr->fce_range.lsr_end) {
- /* case 3: overlap:
- * [new_start [c_start new_end) c_end)
- */
+ } else if (new_end <= f_curr->fce_range.lsr_end) {
+ /* case 3: overlap:
+ * [new_start [c_start new_end) c_end)
+ */
- LASSERT(new_start <= f_curr->fce_range.lsr_start);
+ LASSERT(new_start <= f_curr->fce_range.lsr_start);
- f_curr->fce_range.lsr_start = new_end;
- fld_cache_entry_add(cache, f_new, f_curr->fce_list.prev);
+ f_curr->fce_range.lsr_start = new_end;
+ fld_cache_entry_add(cache, f_new, f_curr->fce_list.prev);
- } else if (f_curr->fce_range.lsr_start <= new_start) {
- /* case 4: overlap:
- * [c_start [new_start c_end) new_end)
- */
+ } else if (f_curr->fce_range.lsr_start <= new_start) {
+ /* case 4: overlap:
+ * [c_start [new_start c_end) new_end)
+ */
- LASSERT(f_curr->fce_range.lsr_end <= new_end);
+ LASSERT(f_curr->fce_range.lsr_end <= new_end);
- f_curr->fce_range.lsr_end = new_start;
- fld_cache_entry_add(cache, f_new, &f_curr->fce_list);
- } else
- CERROR("NEW range ="DRANGE" curr = "DRANGE"\n",
- PRANGE(range),PRANGE(&f_curr->fce_range));
+ f_curr->fce_range.lsr_end = new_start;
+ fld_cache_entry_add(cache, f_new, &f_curr->fce_list);
+ } else
+ CERROR("NEW range ="DRANGE" curr = "DRANGE"\n",
+ PRANGE(range), PRANGE(&f_curr->fce_range));
}
struct fld_cache_entry
const u64 new_start = f_new->fce_range.lsr_start;
const u64 new_end = f_new->fce_range.lsr_end;
__u32 new_flags = f_new->fce_range.lsr_flags;
+
ENTRY;
/*
struct fld_cache_entry *flde;
struct fld_cache_entry *prev = NULL;
struct list_head *head;
+
ENTRY;
read_lock(&cache->fci_lock);
git://git.whamcloud.com / fs / lustre-release.git / blobdiff