return NULL;
}
+/*
+ * Inexact rb-tree search, return the next entry if @offset is not found
+ */
+static inline struct rb_node *tree_search(struct extent_io_tree *tree, u64 offset)
+{
+ return tree_search_for_insert(tree, offset, NULL, NULL);
+}
+
+static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
+{
+ btrfs_panic(tree->fs_info, err,
+ "locking error: extent tree was modified by another thread while locked");
+}
+
/*
* Utility function to look for merge candidates inside a given range. Any
* extents with matching state are merged together into a single extent in the
return next;
}
+/*
+ * Clear some bits on a range in the tree. This may require splitting or
+ * inserting elements in the tree, so the gfp mask is used to indicate which
+ * allocations or sleeping are allowed.
+ *
+ * Pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove the given
+ * range from the tree regardless of state (ie for truncate).
+ *
+ * The range [start, end] is inclusive.
+ *
+ * This takes the tree lock, and returns 0 on success and < 0 on error.
+ */
+int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, int wake, int delete,
+ struct extent_state **cached_state,
+ gfp_t mask, struct extent_changeset *changeset)
+{
+ struct extent_state *state;
+ struct extent_state *cached;
+ struct extent_state *prealloc = NULL;
+ struct rb_node *node;
+ u64 last_end;
+ int err;
+ int clear = 0;
+
+ btrfs_debug_check_extent_io_range(tree, start, end);
+ trace_btrfs_clear_extent_bit(tree, start, end - start + 1, bits);
+
+ if (bits & EXTENT_DELALLOC)
+ bits |= EXTENT_NORESERVE;
+
+ if (delete)
+ bits |= ~EXTENT_CTLBITS;
+
+ if (bits & (EXTENT_LOCKED | EXTENT_BOUNDARY))
+ clear = 1;
+again:
+ if (!prealloc && gfpflags_allow_blocking(mask)) {
+ /*
+ * Don't care for allocation failure here because we might end
+ * up not needing the pre-allocated extent state at all, which
+ * is the case if we only have in the tree extent states that
+ * cover our input range and don't cover too any other range.
+ * If we end up needing a new extent state we allocate it later.
+ */
+ prealloc = alloc_extent_state(mask);
+ }
+
+ spin_lock(&tree->lock);
+ if (cached_state) {
+ cached = *cached_state;
+
+ if (clear) {
+ *cached_state = NULL;
+ cached_state = NULL;
+ }
+
+ if (cached && extent_state_in_tree(cached) &&
+ cached->start <= start && cached->end > start) {
+ if (clear)
+ refcount_dec(&cached->refs);
+ state = cached;
+ goto hit_next;
+ }
+ if (clear)
+ free_extent_state(cached);
+ }
+
+ /* This search will find the extents that end after our range starts. */
+ node = tree_search(tree, start);
+ if (!node)
+ goto out;
+ state = rb_entry(node, struct extent_state, rb_node);
+hit_next:
+ if (state->start > end)
+ goto out;
+ WARN_ON(state->end < start);
+ last_end = state->end;
+
+ /* The state doesn't have the wanted bits, go ahead. */
+ if (!(state->state & bits)) {
+ state = next_state(state);
+ goto next;
+ }
+
+ /*
+ * | ---- desired range ---- |
+ * | state | or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip bits on second
+ * half.
+ *
+ * If the extent we found extends past our range, we just split and
+ * search again. It'll get split again the next time though.
+ *
+ * If the extent we found is inside our range, we clear the desired bit
+ * on it.
+ */
+
+ if (state->start < start) {
+ prealloc = alloc_extent_state_atomic(prealloc);
+ BUG_ON(!prealloc);
+ err = split_state(tree, state, prealloc, start);
+ if (err)
+ extent_io_tree_panic(tree, err);
+
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ state = clear_state_bit(tree, state, bits, wake, changeset);
+ goto next;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * We need to split the extent, and clear the bit on the first half.
+ */
+ if (state->start <= end && state->end > end) {
+ prealloc = alloc_extent_state_atomic(prealloc);
+ BUG_ON(!prealloc);
+ err = split_state(tree, state, prealloc, end + 1);
+ if (err)
+ extent_io_tree_panic(tree, err);
+
+ if (wake)
+ wake_up(&state->wq);
+
+ clear_state_bit(tree, prealloc, bits, wake, changeset);
+
+ prealloc = NULL;
+ goto out;
+ }
+
+ state = clear_state_bit(tree, state, bits, wake, changeset);
+next:
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ if (start <= end && state && !need_resched())
+ goto hit_next;
+
+search_again:
+ if (start > end)
+ goto out;
+ spin_unlock(&tree->lock);
+ if (gfpflags_allow_blocking(mask))
+ cond_resched();
+ goto again;
+
+out:
+ spin_unlock(&tree->lock);
+ if (prealloc)
+ free_extent_state(prealloc);
+
+ return 0;
+
+}
+
+static void wait_on_state(struct extent_io_tree *tree,
+ struct extent_state *state)
+ __releases(tree->lock)
+ __acquires(tree->lock)
+{
+ DEFINE_WAIT(wait);
+ prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE);
+ spin_unlock(&tree->lock);
+ schedule();
+ spin_lock(&tree->lock);
+ finish_wait(&state->wq, &wait);
+}
+
+/*
+ * Wait for one or more bits to clear on a range in the state tree.
+ * The range [start, end] is inclusive.
+ * The tree lock is taken by this function
+ */
+void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits)
+{
+ struct extent_state *state;
+ struct rb_node *node;
+
+ btrfs_debug_check_extent_io_range(tree, start, end);
+
+ spin_lock(&tree->lock);
+again:
+ while (1) {
+ /*
+ * This search will find all the extents that end after our
+ * range starts.
+ */
+ node = tree_search(tree, start);
+process_node:
+ if (!node)
+ break;
+
+ state = rb_entry(node, struct extent_state, rb_node);
+
+ if (state->start > end)
+ goto out;
+
+ if (state->state & bits) {
+ start = state->start;
+ refcount_inc(&state->refs);
+ wait_on_state(tree, state);
+ free_extent_state(state);
+ goto again;
+ }
+ start = state->end + 1;
+
+ if (start > end)
+ break;
+
+ if (!cond_resched_lock(&tree->lock)) {
+ node = rb_next(node);
+ goto process_node;
+ }
+ }
+out:
+ spin_unlock(&tree->lock);
+}
+
+static void cache_state_if_flags(struct extent_state *state,
+ struct extent_state **cached_ptr,
+ unsigned flags)
+{
+ if (cached_ptr && !(*cached_ptr)) {
+ if (!flags || (state->state & flags)) {
+ *cached_ptr = state;
+ refcount_inc(&state->refs);
+ }
+ }
+}
+
+static void cache_state(struct extent_state *state,
+ struct extent_state **cached_ptr)
+{
+ return cache_state_if_flags(state, cached_ptr,
+ EXTENT_LOCKED | EXTENT_BOUNDARY);
+}
+
+/*
+ * Find the first state struct with 'bits' set after 'start', and return it.
+ * tree->lock must be held. NULL will returned if nothing was found after
+ * 'start'.
+ */
+static struct extent_state *find_first_extent_bit_state(struct extent_io_tree *tree,
+ u64 start, u32 bits)
+{
+ struct rb_node *node;
+ struct extent_state *state;
+
+ /*
+ * This search will find all the extents that end after our range
+ * starts.
+ */
+ node = tree_search(tree, start);
+ if (!node)
+ goto out;
+
+ while (1) {
+ state = rb_entry(node, struct extent_state, rb_node);
+ if (state->end >= start && (state->state & bits))
+ return state;
+
+ node = rb_next(node);
+ if (!node)
+ break;
+ }
+out:
+ return NULL;
+}
+
+/*
+ * Find the first offset in the io tree with one or more @bits set.
+ *
+ * Note: If there are multiple bits set in @bits, any of them will match.
+ *
+ * Return 0 if we find something, and update @start_ret and @end_ret.
+ * Return 1 if we found nothing.
+ */
+int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, u32 bits,
+ struct extent_state **cached_state)
+{
+ struct extent_state *state;
+ int ret = 1;
+
+ spin_lock(&tree->lock);
+ if (cached_state && *cached_state) {
+ state = *cached_state;
+ if (state->end == start - 1 && extent_state_in_tree(state)) {
+ while ((state = next_state(state)) != NULL) {
+ if (state->state & bits)
+ goto got_it;
+ }
+ free_extent_state(*cached_state);
+ *cached_state = NULL;
+ goto out;
+ }
+ free_extent_state(*cached_state);
+ *cached_state = NULL;
+ }
+
+ state = find_first_extent_bit_state(tree, start, bits);
+got_it:
+ if (state) {
+ cache_state_if_flags(state, cached_state, 0);
+ *start_ret = state->start;
+ *end_ret = state->end;
+ ret = 0;
+ }
+out:
+ spin_unlock(&tree->lock);
+ return ret;
+}
+
+/*
+ * Find a contiguous area of bits
+ *
+ * @tree: io tree to check
+ * @start: offset to start the search from
+ * @start_ret: the first offset we found with the bits set
+ * @end_ret: the final contiguous range of the bits that were set
+ * @bits: bits to look for
+ *
+ * set_extent_bit and clear_extent_bit can temporarily split contiguous ranges
+ * to set bits appropriately, and then merge them again. During this time it
+ * will drop the tree->lock, so use this helper if you want to find the actual
+ * contiguous area for given bits. We will search to the first bit we find, and
+ * then walk down the tree until we find a non-contiguous area. The area
+ * returned will be the full contiguous area with the bits set.
+ */
+int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
+ u64 *start_ret, u64 *end_ret, u32 bits)
+{
+ struct extent_state *state;
+ int ret = 1;
+
+ spin_lock(&tree->lock);
+ state = find_first_extent_bit_state(tree, start, bits);
+ if (state) {
+ *start_ret = state->start;
+ *end_ret = state->end;
+ while ((state = next_state(state)) != NULL) {
+ if (state->start > (*end_ret + 1))
+ break;
+ *end_ret = state->end;
+ }
+ ret = 0;
+ }
+ spin_unlock(&tree->lock);
+ return ret;
+}
+
+/*
+ * Find a contiguous range of bytes in the file marked as delalloc, not more
+ * than 'max_bytes'. start and end are used to return the range,
+ *
+ * True is returned if we find something, false if nothing was in the tree.
+ */
+bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
+ u64 *end, u64 max_bytes,
+ struct extent_state **cached_state)
+{
+ struct rb_node *node;
+ struct extent_state *state;
+ u64 cur_start = *start;
+ bool found = false;
+ u64 total_bytes = 0;
+
+ spin_lock(&tree->lock);
+
+ /*
+ * This search will find all the extents that end after our range
+ * starts.
+ */
+ node = tree_search(tree, cur_start);
+ if (!node) {
+ *end = (u64)-1;
+ goto out;
+ }
+
+ while (1) {
+ state = rb_entry(node, struct extent_state, rb_node);
+ if (found && (state->start != cur_start ||
+ (state->state & EXTENT_BOUNDARY))) {
+ goto out;
+ }
+ if (!(state->state & EXTENT_DELALLOC)) {
+ if (!found)
+ *end = state->end;
+ goto out;
+ }
+ if (!found) {
+ *start = state->start;
+ *cached_state = state;
+ refcount_inc(&state->refs);
+ }
+ found = true;
+ *end = state->end;
+ cur_start = state->end + 1;
+ node = rb_next(node);
+ total_bytes += state->end - state->start + 1;
+ if (total_bytes >= max_bytes)
+ break;
+ if (!node)
+ break;
+ }
+out:
+ spin_unlock(&tree->lock);
+ return found;
+}
+
+/*
+ * Set some bits on a range in the tree. This may require allocations or
+ * sleeping, so the gfp mask is used to indicate what is allowed.
+ *
+ * If any of the exclusive bits are set, this will fail with -EEXIST if some
+ * part of the range already has the desired bits set. The start of the
+ * existing range is returned in failed_start in this case.
+ *
+ * [start, end] is inclusive This takes the tree lock.
+ */
+int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
+ u32 exclusive_bits, u64 *failed_start,
+ struct extent_state **cached_state, gfp_t mask,
+ struct extent_changeset *changeset)
+{
+ struct extent_state *state;
+ struct extent_state *prealloc = NULL;
+ struct rb_node *node;
+ struct rb_node **p;
+ struct rb_node *parent;
+ int err = 0;
+ u64 last_start;
+ u64 last_end;
+
+ btrfs_debug_check_extent_io_range(tree, start, end);
+ trace_btrfs_set_extent_bit(tree, start, end - start + 1, bits);
+
+ if (exclusive_bits)
+ ASSERT(failed_start);
+ else
+ ASSERT(failed_start == NULL);
+again:
+ if (!prealloc && gfpflags_allow_blocking(mask)) {
+ /*
+ * Don't care for allocation failure here because we might end
+ * up not needing the pre-allocated extent state at all, which
+ * is the case if we only have in the tree extent states that
+ * cover our input range and don't cover too any other range.
+ * If we end up needing a new extent state we allocate it later.
+ */
+ prealloc = alloc_extent_state(mask);
+ }
+
+ spin_lock(&tree->lock);
+ if (cached_state && *cached_state) {
+ state = *cached_state;
+ if (state->start <= start && state->end > start &&
+ extent_state_in_tree(state)) {
+ node = &state->rb_node;
+ goto hit_next;
+ }
+ }
+ /*
+ * This search will find all the extents that end after our range
+ * starts.
+ */
+ node = tree_search_for_insert(tree, start, &p, &parent);
+ if (!node) {
+ prealloc = alloc_extent_state_atomic(prealloc);
+ BUG_ON(!prealloc);
+ prealloc->start = start;
+ prealloc->end = end;
+ insert_state_fast(tree, prealloc, p, parent, bits, changeset);
+ cache_state(prealloc, cached_state);
+ prealloc = NULL;
+ goto out;
+ }
+ state = rb_entry(node, struct extent_state, rb_node);
+hit_next:
+ last_start = state->start;
+ last_end = state->end;
+
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ *
+ * Just lock what we found and keep going
+ */
+ if (state->start == start && state->end <= end) {
+ if (state->state & exclusive_bits) {
+ *failed_start = state->start;
+ err = -EEXIST;
+ goto out;
+ }
+
+ set_state_bits(tree, state, bits, changeset);
+ cache_state(state, cached_state);
+ merge_state(tree, state);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ state = next_state(state);
+ if (start < end && state && state->start == start &&
+ !need_resched())
+ goto hit_next;
+ goto search_again;
+ }
+
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip bits on second
+ * half.
+ *
+ * If the extent we found extends past our range, we just split and
+ * search again. It'll get split again the next time though.
+ *
+ * If the extent we found is inside our range, we set the desired bit
+ * on it.
+ */
+ if (state->start < start) {
+ if (state->state & exclusive_bits) {
+ *failed_start = start;
+ err = -EEXIST;
+ goto out;
+ }
+
+ /*
+ * If this extent already has all the bits we want set, then
+ * skip it, not necessary to split it or do anything with it.
+ */
+ if ((state->state & bits) == bits) {
+ start = state->end + 1;
+ cache_state(state, cached_state);
+ goto search_again;
+ }
+
+ prealloc = alloc_extent_state_atomic(prealloc);
+ BUG_ON(!prealloc);
+ err = split_state(tree, state, prealloc, start);
+ if (err)
+ extent_io_tree_panic(tree, err);
+
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ set_state_bits(tree, state, bits, changeset);
+ cache_state(state, cached_state);
+ merge_state(tree, state);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ state = next_state(state);
+ if (start < end && state && state->start == start &&
+ !need_resched())
+ goto hit_next;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state | or | state |
+ *
+ * There's a hole, we need to insert something in it and ignore the
+ * extent we found.
+ */
+ if (state->start > start) {
+ u64 this_end;
+ if (end < last_start)
+ this_end = end;
+ else
+ this_end = last_start - 1;
+
+ prealloc = alloc_extent_state_atomic(prealloc);
+ BUG_ON(!prealloc);
+
+ /*
+ * Avoid to free 'prealloc' if it can be merged with the later
+ * extent.
+ */
+ prealloc->start = start;
+ prealloc->end = this_end;
+ err = insert_state(tree, prealloc, bits, changeset);
+ if (err)
+ extent_io_tree_panic(tree, err);
+
+ cache_state(prealloc, cached_state);
+ prealloc = NULL;
+ start = this_end + 1;
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ *
+ * We need to split the extent, and set the bit on the first half
+ */
+ if (state->start <= end && state->end > end) {
+ if (state->state & exclusive_bits) {
+ *failed_start = start;
+ err = -EEXIST;
+ goto out;
+ }
+
+ prealloc = alloc_extent_state_atomic(prealloc);
+ BUG_ON(!prealloc);
+ err = split_state(tree, state, prealloc, end + 1);
+ if (err)
+ extent_io_tree_panic(tree, err);
+
+ set_state_bits(tree, prealloc, bits, changeset);
+ cache_state(prealloc, cached_state);
+ merge_state(tree, prealloc);
+ prealloc = NULL;
+ goto out;
+ }
+
+search_again:
+ if (start > end)
+ goto out;
+ spin_unlock(&tree->lock);
+ if (gfpflags_allow_blocking(mask))
+ cond_resched();
+ goto again;
+
+out:
+ spin_unlock(&tree->lock);
+ if (prealloc)
+ free_extent_state(prealloc);
+
+ return err;
+
+}
+
+/*
+ * Convert all bits in a given range from one bit to another
+ *
+ * @tree: the io tree to search
+ * @start: the start offset in bytes
+ * @end: the end offset in bytes (inclusive)
+ * @bits: the bits to set in this range
+ * @clear_bits: the bits to clear in this range
+ * @cached_state: state that we're going to cache
+ *
+ * This will go through and set bits for the given range. If any states exist
+ * already in this range they are set with the given bit and cleared of the
+ * clear_bits. This is only meant to be used by things that are mergeable, ie.
+ * converting from say DELALLOC to DIRTY. This is not meant to be used with
+ * boundary bits like LOCK.
+ *
+ * All allocations are done with GFP_NOFS.
+ */
+int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, u32 clear_bits,
+ struct extent_state **cached_state)
+{
+ struct extent_state *state;
+ struct extent_state *prealloc = NULL;
+ struct rb_node *node;
+ struct rb_node **p;
+ struct rb_node *parent;
+ int err = 0;
+ u64 last_start;
+ u64 last_end;
+ bool first_iteration = true;
+
+ btrfs_debug_check_extent_io_range(tree, start, end);
+ trace_btrfs_convert_extent_bit(tree, start, end - start + 1, bits,
+ clear_bits);
+
+again:
+ if (!prealloc) {
+ /*
+ * Best effort, don't worry if extent state allocation fails
+ * here for the first iteration. We might have a cached state
+ * that matches exactly the target range, in which case no
+ * extent state allocations are needed. We'll only know this
+ * after locking the tree.
+ */
+ prealloc = alloc_extent_state(GFP_NOFS);
+ if (!prealloc && !first_iteration)
+ return -ENOMEM;
+ }
+
+ spin_lock(&tree->lock);
+ if (cached_state && *cached_state) {
+ state = *cached_state;
+ if (state->start <= start && state->end > start &&
+ extent_state_in_tree(state)) {
+ node = &state->rb_node;
+ goto hit_next;
+ }
+ }
+
+ /*
+ * This search will find all the extents that end after our range
+ * starts.
+ */
+ node = tree_search_for_insert(tree, start, &p, &parent);
+ if (!node) {
+ prealloc = alloc_extent_state_atomic(prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
+ prealloc->start = start;
+ prealloc->end = end;
+ insert_state_fast(tree, prealloc, p, parent, bits, NULL);
+ cache_state(prealloc, cached_state);
+ prealloc = NULL;
+ goto out;
+ }
+ state = rb_entry(node, struct extent_state, rb_node);
+hit_next:
+ last_start = state->start;
+ last_end = state->end;
+
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ *
+ * Just lock what we found and keep going.
+ */
+ if (state->start == start && state->end <= end) {
+ set_state_bits(tree, state, bits, NULL);
+ cache_state(state, cached_state);
+ state = clear_state_bit(tree, state, clear_bits, 0, NULL);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ if (start < end && state && state->start == start &&
+ !need_resched())
+ goto hit_next;
+ goto search_again;
+ }
+
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ * or
+ * | ------------- state -------------- |
+ *
+ * We need to split the extent we found, and may flip bits on second
+ * half.
+ *
+ * If the extent we found extends past our range, we just split and
+ * search again. It'll get split again the next time though.
+ *
+ * If the extent we found is inside our range, we set the desired bit
+ * on it.
+ */
+ if (state->start < start) {
+ prealloc = alloc_extent_state_atomic(prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
+ err = split_state(tree, state, prealloc, start);
+ if (err)
+ extent_io_tree_panic(tree, err);
+ prealloc = NULL;
+ if (err)
+ goto out;
+ if (state->end <= end) {
+ set_state_bits(tree, state, bits, NULL);
+ cache_state(state, cached_state);
+ state = clear_state_bit(tree, state, clear_bits, 0, NULL);
+ if (last_end == (u64)-1)
+ goto out;
+ start = last_end + 1;
+ if (start < end && state && state->start == start &&
+ !need_resched())
+ goto hit_next;
+ }
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state | or | state |
+ *
+ * There's a hole, we need to insert something in it and ignore the
+ * extent we found.
+ */
+ if (state->start > start) {
+ u64 this_end;
+ if (end < last_start)
+ this_end = end;
+ else
+ this_end = last_start - 1;
+
+ prealloc = alloc_extent_state_atomic(prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /*
+ * Avoid to free 'prealloc' if it can be merged with the later
+ * extent.
+ */
+ prealloc->start = start;
+ prealloc->end = this_end;
+ err = insert_state(tree, prealloc, bits, NULL);
+ if (err)
+ extent_io_tree_panic(tree, err);
+ cache_state(prealloc, cached_state);
+ prealloc = NULL;
+ start = this_end + 1;
+ goto search_again;
+ }
+ /*
+ * | ---- desired range ---- |
+ * | state |
+ *
+ * We need to split the extent, and set the bit on the first half.
+ */
+ if (state->start <= end && state->end > end) {
+ prealloc = alloc_extent_state_atomic(prealloc);
+ if (!prealloc) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = split_state(tree, state, prealloc, end + 1);
+ if (err)
+ extent_io_tree_panic(tree, err);
+
+ set_state_bits(tree, prealloc, bits, NULL);
+ cache_state(prealloc, cached_state);
+ clear_state_bit(tree, prealloc, clear_bits, 0, NULL);
+ prealloc = NULL;
+ goto out;
+ }
+
+search_again:
+ if (start > end)
+ goto out;
+ spin_unlock(&tree->lock);
+ cond_resched();
+ first_iteration = false;
+ goto again;
+
+out:
+ spin_unlock(&tree->lock);
+ if (prealloc)
+ free_extent_state(prealloc);
+
+ return err;
+}
+
/*
* Find the first range that has @bits not set. This range could start before
* @start.
spin_unlock(&tree->lock);
}
+/*
+ * Count the number of bytes in the tree that have a given bit(s) set. This
+ * can be fairly slow, except for EXTENT_DIRTY which is cached. The total
+ * number found is returned.
+ */
+u64 count_range_bits(struct extent_io_tree *tree,
+ u64 *start, u64 search_end, u64 max_bytes,
+ u32 bits, int contig)
+{
+ struct rb_node *node;
+ struct extent_state *state;
+ u64 cur_start = *start;
+ u64 total_bytes = 0;
+ u64 last = 0;
+ int found = 0;
+
+ if (WARN_ON(search_end <= cur_start))
+ return 0;
+
+ spin_lock(&tree->lock);
+ if (cur_start == 0 && bits == EXTENT_DIRTY) {
+ total_bytes = tree->dirty_bytes;
+ goto out;
+ }
+ /*
+ * This search will find all the extents that end after our range
+ * starts.
+ */
+ node = tree_search(tree, cur_start);
+ if (!node)
+ goto out;
+
+ while (1) {
+ state = rb_entry(node, struct extent_state, rb_node);
+ if (state->start > search_end)
+ break;
+ if (contig && found && state->start > last + 1)
+ break;
+ if (state->end >= cur_start && (state->state & bits) == bits) {
+ total_bytes += min(search_end, state->end) + 1 -
+ max(cur_start, state->start);
+ if (total_bytes >= max_bytes)
+ break;
+ if (!found) {
+ *start = max(cur_start, state->start);
+ found = 1;
+ }
+ last = state->end;
+ } else if (contig && found) {
+ break;
+ }
+ node = rb_next(node);
+ if (!node)
+ break;
+ }
+out:
+ spin_unlock(&tree->lock);
+ return total_bytes;
+}
+
+/*
+ * Searche a range in the state tree for a given mask. If 'filled' == 1, this
+ * returns 1 only if every extent in the tree has the bits set. Otherwise, 1
+ * is returned if any bit in the range is found set.
+ */
+int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
+ u32 bits, int filled, struct extent_state *cached)
+{
+ struct extent_state *state = NULL;
+ struct rb_node *node;
+ int bitset = 0;
+
+ spin_lock(&tree->lock);
+ if (cached && extent_state_in_tree(cached) && cached->start <= start &&
+ cached->end > start)
+ node = &cached->rb_node;
+ else
+ node = tree_search(tree, start);
+ while (node && start <= end) {
+ state = rb_entry(node, struct extent_state, rb_node);
+
+ if (filled && state->start > start) {
+ bitset = 0;
+ break;
+ }
+
+ if (state->start > end)
+ break;
+
+ if (state->state & bits) {
+ bitset = 1;
+ if (!filled)
+ break;
+ } else if (filled) {
+ bitset = 0;
+ break;
+ }
+
+ if (state->end == (u64)-1)
+ break;
+
+ start = state->end + 1;
+ if (start > end)
+ break;
+ node = rb_next(node);
+ if (!node) {
+ if (filled)
+ bitset = 0;
+ break;
+ }
+ }
+ spin_unlock(&tree->lock);
+ return bitset;
+}
+
/* Wrappers around set/clear extent bit */
int set_record_extent_bits(struct extent_io_tree *tree, u64 start, u64 end,
u32 bits, struct extent_changeset *changeset)
kmem_cache_destroy(extent_buffer_cache);
}
-/*
- * Inexact rb-tree search, return the next entry if @offset is not found
- */
-static inline struct rb_node *tree_search(struct extent_io_tree *tree, u64 offset)
-{
- return tree_search_for_insert(tree, offset, NULL, NULL);
-}
-
-static void extent_io_tree_panic(struct extent_io_tree *tree, int err)
-{
- btrfs_panic(tree->fs_info, err,
- "locking error: extent tree was modified by another thread while locked");
-}
-
-/*
- * clear some bits on a range in the tree. This may require splitting
- * or inserting elements in the tree, so the gfp mask is used to
- * indicate which allocations or sleeping are allowed.
- *
- * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove
- * the given range from the tree regardless of state (ie for truncate).
- *
- * the range [start, end] is inclusive.
- *
- * This takes the tree lock, and returns 0 on success and < 0 on error.
- */
-int __clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- u32 bits, int wake, int delete,
- struct extent_state **cached_state,
- gfp_t mask, struct extent_changeset *changeset)
-{
- struct extent_state *state;
- struct extent_state *cached;
- struct extent_state *prealloc = NULL;
- struct rb_node *node;
- u64 last_end;
- int err;
- int clear = 0;
-
- btrfs_debug_check_extent_io_range(tree, start, end);
- trace_btrfs_clear_extent_bit(tree, start, end - start + 1, bits);
-
- if (bits & EXTENT_DELALLOC)
- bits |= EXTENT_NORESERVE;
-
- if (delete)
- bits |= ~EXTENT_CTLBITS;
-
- if (bits & (EXTENT_LOCKED | EXTENT_BOUNDARY))
- clear = 1;
-again:
- if (!prealloc && gfpflags_allow_blocking(mask)) {
- /*
- * Don't care for allocation failure here because we might end
- * up not needing the pre-allocated extent state at all, which
- * is the case if we only have in the tree extent states that
- * cover our input range and don't cover too any other range.
- * If we end up needing a new extent state we allocate it later.
- */
- prealloc = alloc_extent_state(mask);
- }
-
- spin_lock(&tree->lock);
- if (cached_state) {
- cached = *cached_state;
-
- if (clear) {
- *cached_state = NULL;
- cached_state = NULL;
- }
-
- if (cached && extent_state_in_tree(cached) &&
- cached->start <= start && cached->end > start) {
- if (clear)
- refcount_dec(&cached->refs);
- state = cached;
- goto hit_next;
- }
- if (clear)
- free_extent_state(cached);
- }
- /*
- * this search will find the extents that end after
- * our range starts
- */
- node = tree_search(tree, start);
- if (!node)
- goto out;
- state = rb_entry(node, struct extent_state, rb_node);
-hit_next:
- if (state->start > end)
- goto out;
- WARN_ON(state->end < start);
- last_end = state->end;
-
- /* the state doesn't have the wanted bits, go ahead */
- if (!(state->state & bits)) {
- state = next_state(state);
- goto next;
- }
-
- /*
- * | ---- desired range ---- |
- * | state | or
- * | ------------- state -------------- |
- *
- * We need to split the extent we found, and may flip
- * bits on second half.
- *
- * If the extent we found extends past our range, we
- * just split and search again. It'll get split again
- * the next time though.
- *
- * If the extent we found is inside our range, we clear
- * the desired bit on it.
- */
-
- if (state->start < start) {
- prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
- err = split_state(tree, state, prealloc, start);
- if (err)
- extent_io_tree_panic(tree, err);
-
- prealloc = NULL;
- if (err)
- goto out;
- if (state->end <= end) {
- state = clear_state_bit(tree, state, bits, wake, changeset);
- goto next;
- }
- goto search_again;
- }
- /*
- * | ---- desired range ---- |
- * | state |
- * We need to split the extent, and clear the bit
- * on the first half
- */
- if (state->start <= end && state->end > end) {
- prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
- err = split_state(tree, state, prealloc, end + 1);
- if (err)
- extent_io_tree_panic(tree, err);
-
- if (wake)
- wake_up(&state->wq);
-
- clear_state_bit(tree, prealloc, bits, wake, changeset);
-
- prealloc = NULL;
- goto out;
- }
-
- state = clear_state_bit(tree, state, bits, wake, changeset);
-next:
- if (last_end == (u64)-1)
- goto out;
- start = last_end + 1;
- if (start <= end && state && !need_resched())
- goto hit_next;
-
-search_again:
- if (start > end)
- goto out;
- spin_unlock(&tree->lock);
- if (gfpflags_allow_blocking(mask))
- cond_resched();
- goto again;
-
-out:
- spin_unlock(&tree->lock);
- if (prealloc)
- free_extent_state(prealloc);
-
- return 0;
-
-}
-
-static void wait_on_state(struct extent_io_tree *tree,
- struct extent_state *state)
- __releases(tree->lock)
- __acquires(tree->lock)
-{
- DEFINE_WAIT(wait);
- prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE);
- spin_unlock(&tree->lock);
- schedule();
- spin_lock(&tree->lock);
- finish_wait(&state->wq, &wait);
-}
-
-/*
- * waits for one or more bits to clear on a range in the state tree.
- * The range [start, end] is inclusive.
- * The tree lock is taken by this function
- */
-void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits)
-{
- struct extent_state *state;
- struct rb_node *node;
-
- btrfs_debug_check_extent_io_range(tree, start, end);
-
- spin_lock(&tree->lock);
-again:
- while (1) {
- /*
- * this search will find all the extents that end after
- * our range starts
- */
- node = tree_search(tree, start);
-process_node:
- if (!node)
- break;
-
- state = rb_entry(node, struct extent_state, rb_node);
-
- if (state->start > end)
- goto out;
-
- if (state->state & bits) {
- start = state->start;
- refcount_inc(&state->refs);
- wait_on_state(tree, state);
- free_extent_state(state);
- goto again;
- }
- start = state->end + 1;
-
- if (start > end)
- break;
-
- if (!cond_resched_lock(&tree->lock)) {
- node = rb_next(node);
- goto process_node;
- }
- }
-out:
- spin_unlock(&tree->lock);
-}
-
-static void cache_state_if_flags(struct extent_state *state,
- struct extent_state **cached_ptr,
- unsigned flags)
-{
- if (cached_ptr && !(*cached_ptr)) {
- if (!flags || (state->state & flags)) {
- *cached_ptr = state;
- refcount_inc(&state->refs);
- }
- }
-}
-
-static void cache_state(struct extent_state *state,
- struct extent_state **cached_ptr)
-{
- return cache_state_if_flags(state, cached_ptr,
- EXTENT_LOCKED | EXTENT_BOUNDARY);
-}
-
-/*
- * set some bits on a range in the tree. This may require allocations or
- * sleeping, so the gfp mask is used to indicate what is allowed.
- *
- * If any of the exclusive bits are set, this will fail with -EEXIST if some
- * part of the range already has the desired bits set. The start of the
- * existing range is returned in failed_start in this case.
- *
- * [start, end] is inclusive This takes the tree lock.
- */
-int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, u32 bits,
- u32 exclusive_bits, u64 *failed_start,
- struct extent_state **cached_state, gfp_t mask,
- struct extent_changeset *changeset)
-{
- struct extent_state *state;
- struct extent_state *prealloc = NULL;
- struct rb_node *node;
- struct rb_node **p;
- struct rb_node *parent;
- int err = 0;
- u64 last_start;
- u64 last_end;
-
- btrfs_debug_check_extent_io_range(tree, start, end);
- trace_btrfs_set_extent_bit(tree, start, end - start + 1, bits);
-
- if (exclusive_bits)
- ASSERT(failed_start);
- else
- ASSERT(failed_start == NULL);
-again:
- if (!prealloc && gfpflags_allow_blocking(mask)) {
- /*
- * Don't care for allocation failure here because we might end
- * up not needing the pre-allocated extent state at all, which
- * is the case if we only have in the tree extent states that
- * cover our input range and don't cover too any other range.
- * If we end up needing a new extent state we allocate it later.
- */
- prealloc = alloc_extent_state(mask);
- }
-
- spin_lock(&tree->lock);
- if (cached_state && *cached_state) {
- state = *cached_state;
- if (state->start <= start && state->end > start &&
- extent_state_in_tree(state)) {
- node = &state->rb_node;
- goto hit_next;
- }
- }
- /*
- * this search will find all the extents that end after
- * our range starts.
- */
- node = tree_search_for_insert(tree, start, &p, &parent);
- if (!node) {
- prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
- prealloc->start = start;
- prealloc->end = end;
- insert_state_fast(tree, prealloc, p, parent, bits, changeset);
- cache_state(prealloc, cached_state);
- prealloc = NULL;
- goto out;
- }
- state = rb_entry(node, struct extent_state, rb_node);
-hit_next:
- last_start = state->start;
- last_end = state->end;
-
- /*
- * | ---- desired range ---- |
- * | state |
- *
- * Just lock what we found and keep going
- */
- if (state->start == start && state->end <= end) {
- if (state->state & exclusive_bits) {
- *failed_start = state->start;
- err = -EEXIST;
- goto out;
- }
-
- set_state_bits(tree, state, bits, changeset);
- cache_state(state, cached_state);
- merge_state(tree, state);
- if (last_end == (u64)-1)
- goto out;
- start = last_end + 1;
- state = next_state(state);
- if (start < end && state && state->start == start &&
- !need_resched())
- goto hit_next;
- goto search_again;
- }
-
- /*
- * | ---- desired range ---- |
- * | state |
- * or
- * | ------------- state -------------- |
- *
- * We need to split the extent we found, and may flip bits on
- * second half.
- *
- * If the extent we found extends past our
- * range, we just split and search again. It'll get split
- * again the next time though.
- *
- * If the extent we found is inside our range, we set the
- * desired bit on it.
- */
- if (state->start < start) {
- if (state->state & exclusive_bits) {
- *failed_start = start;
- err = -EEXIST;
- goto out;
- }
-
- /*
- * If this extent already has all the bits we want set, then
- * skip it, not necessary to split it or do anything with it.
- */
- if ((state->state & bits) == bits) {
- start = state->end + 1;
- cache_state(state, cached_state);
- goto search_again;
- }
-
- prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
- err = split_state(tree, state, prealloc, start);
- if (err)
- extent_io_tree_panic(tree, err);
-
- prealloc = NULL;
- if (err)
- goto out;
- if (state->end <= end) {
- set_state_bits(tree, state, bits, changeset);
- cache_state(state, cached_state);
- merge_state(tree, state);
- if (last_end == (u64)-1)
- goto out;
- start = last_end + 1;
- state = next_state(state);
- if (start < end && state && state->start == start &&
- !need_resched())
- goto hit_next;
- }
- goto search_again;
- }
- /*
- * | ---- desired range ---- |
- * | state | or | state |
- *
- * There's a hole, we need to insert something in it and
- * ignore the extent we found.
- */
- if (state->start > start) {
- u64 this_end;
- if (end < last_start)
- this_end = end;
- else
- this_end = last_start - 1;
-
- prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
-
- /*
- * Avoid to free 'prealloc' if it can be merged with
- * the later extent.
- */
- prealloc->start = start;
- prealloc->end = this_end;
- err = insert_state(tree, prealloc, bits, changeset);
- if (err)
- extent_io_tree_panic(tree, err);
-
- cache_state(prealloc, cached_state);
- prealloc = NULL;
- start = this_end + 1;
- goto search_again;
- }
- /*
- * | ---- desired range ---- |
- * | state |
- * We need to split the extent, and set the bit
- * on the first half
- */
- if (state->start <= end && state->end > end) {
- if (state->state & exclusive_bits) {
- *failed_start = start;
- err = -EEXIST;
- goto out;
- }
-
- prealloc = alloc_extent_state_atomic(prealloc);
- BUG_ON(!prealloc);
- err = split_state(tree, state, prealloc, end + 1);
- if (err)
- extent_io_tree_panic(tree, err);
-
- set_state_bits(tree, prealloc, bits, changeset);
- cache_state(prealloc, cached_state);
- merge_state(tree, prealloc);
- prealloc = NULL;
- goto out;
- }
-
-search_again:
- if (start > end)
- goto out;
- spin_unlock(&tree->lock);
- if (gfpflags_allow_blocking(mask))
- cond_resched();
- goto again;
-
-out:
- spin_unlock(&tree->lock);
- if (prealloc)
- free_extent_state(prealloc);
-
- return err;
-
-}
-
-/**
- * convert_extent_bit - convert all bits in a given range from one bit to
- * another
- * @tree: the io tree to search
- * @start: the start offset in bytes
- * @end: the end offset in bytes (inclusive)
- * @bits: the bits to set in this range
- * @clear_bits: the bits to clear in this range
- * @cached_state: state that we're going to cache
- *
- * This will go through and set bits for the given range. If any states exist
- * already in this range they are set with the given bit and cleared of the
- * clear_bits. This is only meant to be used by things that are mergeable, ie
- * converting from say DELALLOC to DIRTY. This is not meant to be used with
- * boundary bits like LOCK.
- *
- * All allocations are done with GFP_NOFS.
- */
-int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end,
- u32 bits, u32 clear_bits,
- struct extent_state **cached_state)
-{
- struct extent_state *state;
- struct extent_state *prealloc = NULL;
- struct rb_node *node;
- struct rb_node **p;
- struct rb_node *parent;
- int err = 0;
- u64 last_start;
- u64 last_end;
- bool first_iteration = true;
-
- btrfs_debug_check_extent_io_range(tree, start, end);
- trace_btrfs_convert_extent_bit(tree, start, end - start + 1, bits,
- clear_bits);
-
-again:
- if (!prealloc) {
- /*
- * Best effort, don't worry if extent state allocation fails
- * here for the first iteration. We might have a cached state
- * that matches exactly the target range, in which case no
- * extent state allocations are needed. We'll only know this
- * after locking the tree.
- */
- prealloc = alloc_extent_state(GFP_NOFS);
- if (!prealloc && !first_iteration)
- return -ENOMEM;
- }
-
- spin_lock(&tree->lock);
- if (cached_state && *cached_state) {
- state = *cached_state;
- if (state->start <= start && state->end > start &&
- extent_state_in_tree(state)) {
- node = &state->rb_node;
- goto hit_next;
- }
- }
-
- /*
- * this search will find all the extents that end after
- * our range starts.
- */
- node = tree_search_for_insert(tree, start, &p, &parent);
- if (!node) {
- prealloc = alloc_extent_state_atomic(prealloc);
- if (!prealloc) {
- err = -ENOMEM;
- goto out;
- }
- prealloc->start = start;
- prealloc->end = end;
- insert_state_fast(tree, prealloc, p, parent, bits, NULL);
- cache_state(prealloc, cached_state);
- prealloc = NULL;
- goto out;
- }
- state = rb_entry(node, struct extent_state, rb_node);
-hit_next:
- last_start = state->start;
- last_end = state->end;
-
- /*
- * | ---- desired range ---- |
- * | state |
- *
- * Just lock what we found and keep going
- */
- if (state->start == start && state->end <= end) {
- set_state_bits(tree, state, bits, NULL);
- cache_state(state, cached_state);
- state = clear_state_bit(tree, state, clear_bits, 0, NULL);
- if (last_end == (u64)-1)
- goto out;
- start = last_end + 1;
- if (start < end && state && state->start == start &&
- !need_resched())
- goto hit_next;
- goto search_again;
- }
-
- /*
- * | ---- desired range ---- |
- * | state |
- * or
- * | ------------- state -------------- |
- *
- * We need to split the extent we found, and may flip bits on
- * second half.
- *
- * If the extent we found extends past our
- * range, we just split and search again. It'll get split
- * again the next time though.
- *
- * If the extent we found is inside our range, we set the
- * desired bit on it.
- */
- if (state->start < start) {
- prealloc = alloc_extent_state_atomic(prealloc);
- if (!prealloc) {
- err = -ENOMEM;
- goto out;
- }
- err = split_state(tree, state, prealloc, start);
- if (err)
- extent_io_tree_panic(tree, err);
- prealloc = NULL;
- if (err)
- goto out;
- if (state->end <= end) {
- set_state_bits(tree, state, bits, NULL);
- cache_state(state, cached_state);
- state = clear_state_bit(tree, state, clear_bits, 0, NULL);
- if (last_end == (u64)-1)
- goto out;
- start = last_end + 1;
- if (start < end && state && state->start == start &&
- !need_resched())
- goto hit_next;
- }
- goto search_again;
- }
- /*
- * | ---- desired range ---- |
- * | state | or | state |
- *
- * There's a hole, we need to insert something in it and
- * ignore the extent we found.
- */
- if (state->start > start) {
- u64 this_end;
- if (end < last_start)
- this_end = end;
- else
- this_end = last_start - 1;
-
- prealloc = alloc_extent_state_atomic(prealloc);
- if (!prealloc) {
- err = -ENOMEM;
- goto out;
- }
-
- /*
- * Avoid to free 'prealloc' if it can be merged with
- * the later extent.
- */
- prealloc->start = start;
- prealloc->end = this_end;
- err = insert_state(tree, prealloc, bits, NULL);
- if (err)
- extent_io_tree_panic(tree, err);
- cache_state(prealloc, cached_state);
- prealloc = NULL;
- start = this_end + 1;
- goto search_again;
- }
- /*
- * | ---- desired range ---- |
- * | state |
- * We need to split the extent, and set the bit
- * on the first half
- */
- if (state->start <= end && state->end > end) {
- prealloc = alloc_extent_state_atomic(prealloc);
- if (!prealloc) {
- err = -ENOMEM;
- goto out;
- }
-
- err = split_state(tree, state, prealloc, end + 1);
- if (err)
- extent_io_tree_panic(tree, err);
-
- set_state_bits(tree, prealloc, bits, NULL);
- cache_state(prealloc, cached_state);
- clear_state_bit(tree, prealloc, clear_bits, 0, NULL);
- prealloc = NULL;
- goto out;
- }
-
-search_again:
- if (start > end)
- goto out;
- spin_unlock(&tree->lock);
- cond_resched();
- first_iteration = false;
- goto again;
-
-out:
- spin_unlock(&tree->lock);
- if (prealloc)
- free_extent_state(prealloc);
-
- return err;
-}
-
void extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end)
{
unsigned long index = start >> PAGE_SHIFT;
}
}
-/* find the first state struct with 'bits' set after 'start', and
- * return it. tree->lock must be held. NULL will returned if
- * nothing was found after 'start'
- */
-static struct extent_state *
-find_first_extent_bit_state(struct extent_io_tree *tree, u64 start, u32 bits)
-{
- struct rb_node *node;
- struct extent_state *state;
-
- /*
- * this search will find all the extents that end after
- * our range starts.
- */
- node = tree_search(tree, start);
- if (!node)
- goto out;
-
- while (1) {
- state = rb_entry(node, struct extent_state, rb_node);
- if (state->end >= start && (state->state & bits))
- return state;
-
- node = rb_next(node);
- if (!node)
- break;
- }
-out:
- return NULL;
-}
-
-/*
- * Find the first offset in the io tree with one or more @bits set.
- *
- * Note: If there are multiple bits set in @bits, any of them will match.
- *
- * Return 0 if we find something, and update @start_ret and @end_ret.
- * Return 1 if we found nothing.
- */
-int find_first_extent_bit(struct extent_io_tree *tree, u64 start,
- u64 *start_ret, u64 *end_ret, u32 bits,
- struct extent_state **cached_state)
-{
- struct extent_state *state;
- int ret = 1;
-
- spin_lock(&tree->lock);
- if (cached_state && *cached_state) {
- state = *cached_state;
- if (state->end == start - 1 && extent_state_in_tree(state)) {
- while ((state = next_state(state)) != NULL) {
- if (state->state & bits)
- goto got_it;
- }
- free_extent_state(*cached_state);
- *cached_state = NULL;
- goto out;
- }
- free_extent_state(*cached_state);
- *cached_state = NULL;
- }
-
- state = find_first_extent_bit_state(tree, start, bits);
-got_it:
- if (state) {
- cache_state_if_flags(state, cached_state, 0);
- *start_ret = state->start;
- *end_ret = state->end;
- ret = 0;
- }
-out:
- spin_unlock(&tree->lock);
- return ret;
-}
-
-/**
- * Find a contiguous area of bits
- *
- * @tree: io tree to check
- * @start: offset to start the search from
- * @start_ret: the first offset we found with the bits set
- * @end_ret: the final contiguous range of the bits that were set
- * @bits: bits to look for
- *
- * set_extent_bit and clear_extent_bit can temporarily split contiguous ranges
- * to set bits appropriately, and then merge them again. During this time it
- * will drop the tree->lock, so use this helper if you want to find the actual
- * contiguous area for given bits. We will search to the first bit we find, and
- * then walk down the tree until we find a non-contiguous area. The area
- * returned will be the full contiguous area with the bits set.
- */
-int find_contiguous_extent_bit(struct extent_io_tree *tree, u64 start,
- u64 *start_ret, u64 *end_ret, u32 bits)
-{
- struct extent_state *state;
- int ret = 1;
-
- spin_lock(&tree->lock);
- state = find_first_extent_bit_state(tree, start, bits);
- if (state) {
- *start_ret = state->start;
- *end_ret = state->end;
- while ((state = next_state(state)) != NULL) {
- if (state->start > (*end_ret + 1))
- break;
- *end_ret = state->end;
- }
- ret = 0;
- }
- spin_unlock(&tree->lock);
- return ret;
-}
-
-/*
- * find a contiguous range of bytes in the file marked as delalloc, not
- * more than 'max_bytes'. start and end are used to return the range,
- *
- * true is returned if we find something, false if nothing was in the tree
- */
-bool btrfs_find_delalloc_range(struct extent_io_tree *tree, u64 *start,
- u64 *end, u64 max_bytes,
- struct extent_state **cached_state)
-{
- struct rb_node *node;
- struct extent_state *state;
- u64 cur_start = *start;
- bool found = false;
- u64 total_bytes = 0;
-
- spin_lock(&tree->lock);
-
- /*
- * this search will find all the extents that end after
- * our range starts.
- */
- node = tree_search(tree, cur_start);
- if (!node) {
- *end = (u64)-1;
- goto out;
- }
-
- while (1) {
- state = rb_entry(node, struct extent_state, rb_node);
- if (found && (state->start != cur_start ||
- (state->state & EXTENT_BOUNDARY))) {
- goto out;
- }
- if (!(state->state & EXTENT_DELALLOC)) {
- if (!found)
- *end = state->end;
- goto out;
- }
- if (!found) {
- *start = state->start;
- *cached_state = state;
- refcount_inc(&state->refs);
- }
- found = true;
- *end = state->end;
- cur_start = state->end + 1;
- node = rb_next(node);
- total_bytes += state->end - state->start + 1;
- if (total_bytes >= max_bytes)
- break;
- if (!node)
- break;
- }
-out:
- spin_unlock(&tree->lock);
- return found;
-}
-
/*
* Process one page for __process_pages_contig().
*
start, end, page_ops, NULL);
}
-/*
- * count the number of bytes in the tree that have a given bit(s)
- * set. This can be fairly slow, except for EXTENT_DIRTY which is
- * cached. The total number found is returned.
- */
-u64 count_range_bits(struct extent_io_tree *tree,
- u64 *start, u64 search_end, u64 max_bytes,
- u32 bits, int contig)
-{
- struct rb_node *node;
- struct extent_state *state;
- u64 cur_start = *start;
- u64 total_bytes = 0;
- u64 last = 0;
- int found = 0;
-
- if (WARN_ON(search_end <= cur_start))
- return 0;
-
- spin_lock(&tree->lock);
- if (cur_start == 0 && bits == EXTENT_DIRTY) {
- total_bytes = tree->dirty_bytes;
- goto out;
- }
- /*
- * this search will find all the extents that end after
- * our range starts.
- */
- node = tree_search(tree, cur_start);
- if (!node)
- goto out;
-
- while (1) {
- state = rb_entry(node, struct extent_state, rb_node);
- if (state->start > search_end)
- break;
- if (contig && found && state->start > last + 1)
- break;
- if (state->end >= cur_start && (state->state & bits) == bits) {
- total_bytes += min(search_end, state->end) + 1 -
- max(cur_start, state->start);
- if (total_bytes >= max_bytes)
- break;
- if (!found) {
- *start = max(cur_start, state->start);
- found = 1;
- }
- last = state->end;
- } else if (contig && found) {
- break;
- }
- node = rb_next(node);
- if (!node)
- break;
- }
-out:
- spin_unlock(&tree->lock);
- return total_bytes;
-}
-
static int insert_failrec(struct btrfs_inode *inode,
struct io_failure_record *failrec)
{
return failrec;
}
-/*
- * searches a range in the state tree for a given mask.
- * If 'filled' == 1, this returns 1 only if every extent in the tree
- * has the bits set. Otherwise, 1 is returned if any bit in the
- * range is found set.
- */
-int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end,
- u32 bits, int filled, struct extent_state *cached)
-{
- struct extent_state *state = NULL;
- struct rb_node *node;
- int bitset = 0;
-
- spin_lock(&tree->lock);
- if (cached && extent_state_in_tree(cached) && cached->start <= start &&
- cached->end > start)
- node = &cached->rb_node;
- else
- node = tree_search(tree, start);
- while (node && start <= end) {
- state = rb_entry(node, struct extent_state, rb_node);
-
- if (filled && state->start > start) {
- bitset = 0;
- break;
- }
-
- if (state->start > end)
- break;
-
- if (state->state & bits) {
- bitset = 1;
- if (!filled)
- break;
- } else if (filled) {
- bitset = 0;
- break;
- }
-
- if (state->end == (u64)-1)
- break;
-
- start = state->end + 1;
- if (start > end)
- break;
- node = rb_next(node);
- if (!node) {
- if (filled)
- bitset = 0;
- break;
- }
- }
- spin_unlock(&tree->lock);
- return bitset;
-}
-
static int free_io_failure(struct btrfs_inode *inode,
struct io_failure_record *rec)
{
projects / users / jedix / linux-maple.git / commitdiff