X-Git-Url: https://git.whamcloud.com/?p=fs%2Flustre-release.git;a=blobdiff_plain;f=lustre%2Fosd-ldiskfs%2Fosd_iam.c;h=edada306c50627a6ae2b15f36eccc7be67b361d7;hp=802f4f91be569bef3b50f8ccbd92a464810b1799;hb=2aa7bd74f6fae63692c65217b5dd38a709b0c0bd;hpb=43603bd10268da3daf0f176d45ef65cc4917f713 diff --git a/lustre/osd-ldiskfs/osd_iam.c b/lustre/osd-ldiskfs/osd_iam.c index 802f4f9..edada30 100644 --- a/lustre/osd-ldiskfs/osd_iam.c +++ b/lustre/osd-ldiskfs/osd_iam.c @@ -27,7 +27,7 @@ * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * - * Copyright (c) 2011, 2012, Whamcloud, Inc. + * Copyright (c) 2011, 2014, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ @@ -101,6 +101,41 @@ * Format of a leaf node is not specified. Generic iam code accesses leaf * nodes through ->id_leaf methods in struct iam_descr. * + * The IAM root block is a special node, which contains the IAM descriptor. + * It is on disk format: + * + * +---------+-------+--------+---------+-------+------+-------+------------+ + * |IAM desc | count | idle | | | | | | + * |(fix/var)| / | blocks | padding | entry | .... | entry | free space | + * | | limit | | | | | | | + * +---------+-------+--------+---------+-------+------+-------+------------+ + * + * The padding length is calculated with the parameters in the IAM descriptor. + * + * The field "idle_blocks" is used to record empty leaf nodes, which have not + * been released but all contained entries in them have been removed. Usually, + * the idle blocks in the IAM should be reused when need to allocate new leaf + * nodes for new entries, it depends on the IAM hash functions to map the new + * entries to these idle blocks. Unfortunately, it is not easy to design some + * hash functions for such clever mapping, especially considering the insert/ + * lookup performance. + * + * So the IAM recycles the empty leaf nodes, and put them into a per-file based + * idle blocks pool. If need some new leaf node, it will try to take idle block + * from such pool with priority, in spite of how the IAM hash functions to map + * the entry. + * + * The idle blocks pool is organized as a series of tables, and each table + * can be described as following (on-disk format): + * + * +---------+---------+---------+---------+------+---------+-------+ + * | magic | count | next | logic | | logic | free | + * |(16 bits)|(16 bits)| table | blk # | .... | blk # | space | + * | | |(32 bits)|(32 bits)| |(32 bits)| | + * +---------+---------+---------+---------+------+---------+-------+ + * + * The logic blk# for the first table is stored in the root node "idle_blocks". + * */ #include @@ -112,23 +147,61 @@ #include #include #include + +#include +#include +#undef ENTRY + #include "osd_internal.h" -#include "xattr.h" -#include "acl.h" +#include /* * List of all registered formats. * * No locking. Callers synchronize. */ -static CFS_LIST_HEAD(iam_formats); +static struct list_head iam_formats = LIST_HEAD_INIT(iam_formats); void iam_format_register(struct iam_format *fmt) { - cfs_list_add(&fmt->if_linkage, &iam_formats); + list_add(&fmt->if_linkage, &iam_formats); +} + +static struct buffer_head * +iam_load_idle_blocks(struct iam_container *c, iam_ptr_t blk) +{ + struct inode *inode = c->ic_object; + struct iam_idle_head *head; + struct buffer_head *bh; + int err = 0; + + LASSERT(mutex_is_locked(&c->ic_idle_mutex)); + + if (blk == 0) + return NULL; + + bh = ldiskfs_bread(NULL, inode, blk, 0, &err); + if (bh == NULL) { + CERROR("%.16s: cannot load idle blocks, blk = %u, err = %d\n", + LDISKFS_SB(inode->i_sb)->s_es->s_volume_name, blk, err); + c->ic_idle_failed = 1; + err = err ? err : -EIO; + return ERR_PTR(err); + } + + head = (struct iam_idle_head *)(bh->b_data); + if (le16_to_cpu(head->iih_magic) != IAM_IDLE_HEADER_MAGIC) { + CERROR("%.16s: invalid idle block head, blk = %u, magic = %d\n", + LDISKFS_SB(inode->i_sb)->s_es->s_volume_name, blk, + le16_to_cpu(head->iih_magic)); + brelse(bh); + c->ic_idle_failed = 1; + return ERR_PTR(-EBADF); + } + + return bh; } -EXPORT_SYMBOL(iam_format_register); /* * Determine format of given container. This is done by scanning list of @@ -153,28 +226,47 @@ static int iam_format_guess(struct iam_container *c) } result = -ENOENT; - cfs_list_for_each_entry(fmt, &iam_formats, if_linkage) { + list_for_each_entry(fmt, &iam_formats, if_linkage) { result = fmt->if_guess(c); if (result == 0) break; } - return result; + + if (result == 0) { + struct buffer_head *bh; + __u32 *idle_blocks; + + LASSERT(c->ic_root_bh != NULL); + + idle_blocks = (__u32 *)(c->ic_root_bh->b_data + + c->ic_descr->id_root_gap + + sizeof(struct dx_countlimit)); + mutex_lock(&c->ic_idle_mutex); + bh = iam_load_idle_blocks(c, le32_to_cpu(*idle_blocks)); + if (bh != NULL && IS_ERR(bh)) + result = PTR_ERR(bh); + else + c->ic_idle_bh = bh; + mutex_unlock(&c->ic_idle_mutex); + } + + return result; } /* * Initialize container @c. */ int iam_container_init(struct iam_container *c, - struct iam_descr *descr, struct inode *inode) + struct iam_descr *descr, struct inode *inode) { - memset(c, 0, sizeof *c); - c->ic_descr = descr; - c->ic_object = inode; - cfs_init_rwsem(&c->ic_sem); + memset(c, 0, sizeof *c); + c->ic_descr = descr; + c->ic_object = inode; + init_rwsem(&c->ic_sem); dynlock_init(&c->ic_tree_lock); - return 0; + mutex_init(&c->ic_idle_mutex); + return 0; } -EXPORT_SYMBOL(iam_container_init); /* * Determine container format. @@ -183,17 +275,17 @@ int iam_container_setup(struct iam_container *c) { return iam_format_guess(c); } -EXPORT_SYMBOL(iam_container_setup); /* * Finalize container @c, release all resources. */ void iam_container_fini(struct iam_container *c) { - brelse(c->ic_root_bh); - c->ic_root_bh = NULL; + brelse(c->ic_idle_bh); + c->ic_idle_bh = NULL; + brelse(c->ic_root_bh); + c->ic_root_bh = NULL; } -EXPORT_SYMBOL(iam_container_fini); void iam_path_init(struct iam_path *path, struct iam_container *c, struct iam_path_descr *pd) @@ -213,6 +305,7 @@ void iam_path_release(struct iam_path *path) for (i = 0; i < ARRAY_SIZE(path->ip_frames); i++) { if (path->ip_frames[i].bh != NULL) { + path->ip_frames[i].at_shifted = 0; brelse(path->ip_frames[i].bh); path->ip_frames[i].bh = NULL; } @@ -258,12 +351,10 @@ struct iam_path_descr *iam_ipd_alloc(void *area, int keysize) ipd->ipd_key_scratch[i] = karea; return ipd; } -EXPORT_SYMBOL(iam_ipd_alloc); void iam_ipd_free(struct iam_path_descr *ipd) { } -EXPORT_SYMBOL(iam_ipd_free); int iam_node_read(struct iam_container *c, iam_ptr_t ptr, handle_t *h, struct buffer_head **bh) @@ -284,7 +375,7 @@ int iam_node_read(struct iam_container *c, iam_ptr_t ptr, *bh = ldiskfs_bread(h, c->ic_object, (int)ptr, 0, &result); if (*bh == NULL) - result = -EIO; + result = result ? result : -EIO; return result; } @@ -364,33 +455,33 @@ static int iam_path_check(struct iam_path *p) static int iam_leaf_load(struct iam_path *path) { - iam_ptr_t block; - int err; - struct iam_container *c; - struct buffer_head *bh; - struct iam_leaf *leaf; - struct iam_descr *descr; - - c = path->ip_container; - leaf = &path->ip_leaf; - descr = iam_path_descr(path); - block = path->ip_frame->leaf; - if (block == 0) { - /* XXX bug 11027 */ - printk(CFS_KERN_EMERG "wrong leaf: %lu %d [%p %p %p]\n", - (long unsigned)path->ip_frame->leaf, - dx_get_count(dx_node_get_entries(path, path->ip_frame)), - path->ip_frames[0].bh, path->ip_frames[1].bh, - path->ip_frames[2].bh); - } - err = descr->id_ops->id_node_read(c, block, NULL, &bh); - if (err == 0) { - leaf->il_bh = bh; - leaf->il_curidx = block; - err = iam_leaf_ops(leaf)->init(leaf); - assert_inv(ergo(err == 0, iam_leaf_check(leaf))); - } - return err; + iam_ptr_t block; + int err; + struct iam_container *c; + struct buffer_head *bh; + struct iam_leaf *leaf; + struct iam_descr *descr; + + c = path->ip_container; + leaf = &path->ip_leaf; + descr = iam_path_descr(path); + block = path->ip_frame->leaf; + if (block == 0) { + /* XXX bug 11027 */ + printk(KERN_EMERG "wrong leaf: %lu %d [%p %p %p]\n", + (long unsigned)path->ip_frame->leaf, + dx_get_count(dx_node_get_entries(path, path->ip_frame)), + path->ip_frames[0].bh, path->ip_frames[1].bh, + path->ip_frames[2].bh); + } + err = descr->id_ops->id_node_read(c, block, NULL, &bh); + if (err == 0) { + leaf->il_bh = bh; + leaf->il_curidx = block; + err = iam_leaf_ops(leaf)->init(leaf); + assert_inv(ergo(err == 0, iam_leaf_check(leaf))); + } + return err; } static void iam_unlock_htree(struct iam_container *ic, @@ -451,11 +542,17 @@ int iam_leaf_at_end(const struct iam_leaf *leaf) return iam_leaf_ops(leaf)->at_end(leaf); } -void iam_leaf_split(struct iam_leaf *l, struct buffer_head **bh, iam_ptr_t nr) +static void iam_leaf_split(struct iam_leaf *l, struct buffer_head **bh, + iam_ptr_t nr) { iam_leaf_ops(l)->split(l, bh, nr); } +static inline int iam_leaf_empty(struct iam_leaf *l) +{ + return iam_leaf_ops(l)->leaf_empty(l); +} + int iam_leaf_can_add(const struct iam_leaf *l, const struct iam_key *k, const struct iam_rec *r) { @@ -507,7 +604,7 @@ static int iam_txn_dirty(handle_t *handle, { int result; - result = ldiskfs_journal_dirty_metadata(handle, bh); + result = ldiskfs_handle_dirty_metadata(handle, NULL, bh); if (result != 0) ldiskfs_std_error(iam_path_obj(path)->i_sb, result); return result; @@ -595,22 +692,22 @@ static int iam_it_get_exact(struct iam_iterator *it, const struct iam_key *k) void iam_container_write_lock(struct iam_container *ic) { - cfs_down_write(&ic->ic_sem); + down_write(&ic->ic_sem); } void iam_container_write_unlock(struct iam_container *ic) { - cfs_up_write(&ic->ic_sem); + up_write(&ic->ic_sem); } void iam_container_read_lock(struct iam_container *ic) { - cfs_down_read(&ic->ic_sem); + down_read(&ic->ic_sem); } void iam_container_read_unlock(struct iam_container *ic) { - cfs_up_read(&ic->ic_sem); + up_read(&ic->ic_sem); } /* @@ -627,7 +724,6 @@ int iam_it_init(struct iam_iterator *it, struct iam_container *c, __u32 flags, iam_path_init(&it->ii_path, c, pd); return 0; } -EXPORT_SYMBOL(iam_it_init); /* * Finalize iterator and release all resources. @@ -639,7 +735,6 @@ void iam_it_fini(struct iam_iterator *it) assert_corr(it_state(it) == IAM_IT_DETACHED); iam_path_fini(&it->ii_path); } -EXPORT_SYMBOL(iam_it_fini); /* * this locking primitives are used to protect parts @@ -652,7 +747,7 @@ static struct dynlock_handle *iam_lock_htree(struct iam_container *ic, return dynlock_lock(&ic->ic_tree_lock, value, lt, GFP_NOFS); } -int iam_index_lock(struct iam_path *path, struct dynlock_handle **lh) +static int iam_index_lock(struct iam_path *path, struct dynlock_handle **lh) { struct iam_frame *f; @@ -712,8 +807,8 @@ int dx_index_is_compat(struct iam_path *path) * */ -struct iam_entry *iam_find_position(struct iam_path *path, - struct iam_frame *frame) +static struct iam_entry *iam_find_position(struct iam_path *path, + struct iam_frame *frame) { int count; struct iam_entry *p; @@ -939,13 +1034,11 @@ static int iam_check_full_path(struct iam_path *path, int search) * Performs path lookup and returns with found leaf (if any) locked by htree * lock. */ -int iam_lookup_lock(struct iam_path *path, - struct dynlock_handle **dl, enum dynlock_type lt) +static int iam_lookup_lock(struct iam_path *path, + struct dynlock_handle **dl, enum dynlock_type lt) { int result; - struct inode *dir; - dir = iam_path_obj(path); while ((result = __iam_path_lookup(path)) == 0) { do_corr(schedule()); *dl = iam_lock_htree(path->ip_container, path->ip_frame->leaf, @@ -975,13 +1068,11 @@ int iam_lookup_lock(struct iam_path *path, static int iam_path_lookup(struct iam_path *path, int index) { struct iam_container *c; - struct iam_descr *descr; struct iam_leaf *leaf; int result; c = path->ip_container; leaf = &path->ip_leaf; - descr = iam_path_descr(path); result = iam_lookup_lock(path, &leaf->il_lock, DLT_WRITE); assert_inv(iam_path_check(path)); do_corr(schedule()); @@ -1102,7 +1193,6 @@ int iam_it_get(struct iam_iterator *it, const struct iam_key *k) it_keycmp(it, k) <= 0)); return result; } -EXPORT_SYMBOL(iam_it_get); /* * Attach iterator by index key. @@ -1141,7 +1231,6 @@ int iam_it_get_at(struct iam_iterator *it, const struct iam_key *k) assert_corr(ergo(result >= 0, it_state(it) == IAM_IT_ATTACHED)); return result; } -EXPORT_SYMBOL(iam_it_get_at); /* * Duplicates iterator. @@ -1182,7 +1271,6 @@ void iam_it_put(struct iam_iterator *it) iam_leaf_fini(&it->ii_path.ip_leaf); } } -EXPORT_SYMBOL(iam_it_put); static struct iam_ikey *iam_it_ikey_get(const struct iam_iterator *it, struct iam_ikey *ikey); @@ -1225,7 +1313,10 @@ static int iam_htree_advance(struct inode *dir, __u32 hash, while (1) { do_corr(schedule()); iam_lock_bh(p->bh); - p->at = iam_entry_shift(path, p->at, +1); + if (p->at_shifted) + p->at_shifted = 0; + else + p->at = iam_entry_shift(path, p->at, +1); if (p->at < iam_entry_shift(path, p->entries, dx_get_count(p->entries))) { p->leaf = dx_get_block(path, p->at); @@ -1315,7 +1406,7 @@ static void iam_unlock_array(struct iam_container *ic, int iam_index_next(struct iam_container *c, struct iam_path *path) { iam_ptr_t cursor; - struct dynlock_handle *lh[DX_MAX_TREE_HEIGHT] = { 0, }; + struct dynlock_handle *lh[DX_MAX_TREE_HEIGHT] = { NULL, }; int result; struct inode *object; @@ -1400,7 +1491,6 @@ int iam_it_next(struct iam_iterator *it) int result; struct iam_path *path; struct iam_leaf *leaf; - struct inode *obj; do_corr(struct iam_ikey *ik_orig); /* assert_corr(it->ii_flags&IAM_IT_MOVE); */ @@ -1409,7 +1499,6 @@ int iam_it_next(struct iam_iterator *it) path = &it->ii_path; leaf = &path->ip_leaf; - obj = iam_path_obj(path); assert_corr(iam_leaf_is_locked(leaf)); @@ -1459,7 +1548,6 @@ int iam_it_next(struct iam_iterator *it) it_ikeycmp(it, ik_orig) >= 0)); return result; } -EXPORT_SYMBOL(iam_it_next); /* * Return pointer to the record under iterator. @@ -1473,7 +1561,6 @@ struct iam_rec *iam_it_rec_get(const struct iam_iterator *it) assert_corr(it_at_rec(it)); return iam_leaf_rec(&it->ii_path.ip_leaf); } -EXPORT_SYMBOL(iam_it_rec_get); static void iam_it_reccpy(struct iam_iterator *it, const struct iam_rec *r) { @@ -1511,7 +1598,6 @@ int iam_it_rec_set(handle_t *h, } return result; } -EXPORT_SYMBOL(iam_it_rec_set); /* * Return pointer to the index key under iterator. @@ -1541,7 +1627,6 @@ struct iam_key *iam_it_key_get(const struct iam_iterator *it) assert_corr(it_at_rec(it)); return iam_leaf_key(&it->ii_path.ip_leaf); } -EXPORT_SYMBOL(iam_it_key_get); /* * Return size of key under iterator (in bytes) @@ -1556,13 +1641,111 @@ int iam_it_key_size(const struct iam_iterator *it) assert_corr(it_at_rec(it)); return iam_leaf_key_size(&it->ii_path.ip_leaf); } -EXPORT_SYMBOL(iam_it_key_size); + +static struct buffer_head * +iam_new_node(handle_t *h, struct iam_container *c, iam_ptr_t *b, int *e) +{ + struct inode *inode = c->ic_object; + struct buffer_head *bh = NULL; + struct iam_idle_head *head; + struct buffer_head *idle; + __u32 *idle_blocks; + __u16 count; + + if (c->ic_idle_bh == NULL) + goto newblock; + + mutex_lock(&c->ic_idle_mutex); + if (unlikely(c->ic_idle_bh == NULL)) { + mutex_unlock(&c->ic_idle_mutex); + goto newblock; + } + + head = (struct iam_idle_head *)(c->ic_idle_bh->b_data); + count = le16_to_cpu(head->iih_count); + if (count > 0) { + *e = ldiskfs_journal_get_write_access(h, c->ic_idle_bh); + if (*e != 0) + goto fail; + + --count; + *b = le32_to_cpu(head->iih_blks[count]); + head->iih_count = cpu_to_le16(count); + *e = ldiskfs_handle_dirty_metadata(h, inode, c->ic_idle_bh); + if (*e != 0) + goto fail; + + mutex_unlock(&c->ic_idle_mutex); + bh = ldiskfs_bread(NULL, inode, *b, 0, e); + if (bh == NULL) { + *e = *e ? *e : -EIO; + return NULL; + } + goto got; + } + + /* The block itself which contains the iam_idle_head is + * also an idle block, and can be used as the new node. */ + idle_blocks = (__u32 *)(c->ic_root_bh->b_data + + c->ic_descr->id_root_gap + + sizeof(struct dx_countlimit)); + *e = ldiskfs_journal_get_write_access(h, c->ic_root_bh); + if (*e != 0) + goto fail; + + *b = le32_to_cpu(*idle_blocks); + iam_lock_bh(c->ic_root_bh); + *idle_blocks = head->iih_next; + iam_unlock_bh(c->ic_root_bh); + *e = ldiskfs_handle_dirty_metadata(h, inode, c->ic_root_bh); + if (*e != 0) { + iam_lock_bh(c->ic_root_bh); + *idle_blocks = cpu_to_le32(*b); + iam_unlock_bh(c->ic_root_bh); + goto fail; + } + + bh = c->ic_idle_bh; + idle = iam_load_idle_blocks(c, le32_to_cpu(*idle_blocks)); + if (idle != NULL && IS_ERR(idle)) { + *e = PTR_ERR(idle); + c->ic_idle_bh = NULL; + brelse(bh); + goto fail; + } + + c->ic_idle_bh = idle; + mutex_unlock(&c->ic_idle_mutex); + +got: + /* get write access for the found buffer head */ + *e = ldiskfs_journal_get_write_access(h, bh); + if (*e != 0) { + brelse(bh); + bh = NULL; + ldiskfs_std_error(inode->i_sb, *e); + } else { + /* Clear the reused node as new node does. */ + memset(bh->b_data, 0, inode->i_sb->s_blocksize); + set_buffer_uptodate(bh); + } + return bh; + +newblock: + bh = osd_ldiskfs_append(h, inode, b, e); + return bh; + +fail: + mutex_unlock(&c->ic_idle_mutex); + ldiskfs_std_error(inode->i_sb, *e); + return NULL; +} /* * Insertion of new record. Interaction with jbd during non-trivial case (when * split happens) is as following: * - * - new leaf node is involved into transaction by ldiskfs_append(); + * - new leaf node is involved into transaction by iam_new_node(); * * - old leaf node is involved into transaction by iam_add_rec(); * @@ -1600,7 +1783,7 @@ static int iam_new_leaf(handle_t *handle, struct iam_leaf *leaf) path = leaf->il_path; obj = c->ic_object; - new_leaf = ldiskfs_append(handle, obj, (__u32 *)&blknr, &err); + new_leaf = iam_new_node(handle, c, &blknr, &err); do_corr(schedule()); if (new_leaf != NULL) { struct dynlock_handle *lh; @@ -1623,12 +1806,12 @@ static int iam_new_leaf(handle_t *handle, struct iam_leaf *leaf) iam_unlock_htree(path->ip_container, lh); do_corr(schedule()); err = iam_txn_dirty(handle, path, new_leaf); - brelse(new_leaf); if (err == 0) err = ldiskfs_mark_inode_dirty(handle, obj); do_corr(schedule()); } else err = -ENOMEM; + brelse(new_leaf); } assert_inv(iam_leaf_check(leaf)); assert_inv(iam_leaf_check(&iam_leaf_path(leaf)->ip_leaf)); @@ -1701,8 +1884,8 @@ int split_index_node(handle_t *handle, struct iam_path *path, struct iam_entry *entries; /* old block contents */ struct iam_entry *entries2; /* new block contents */ - struct iam_frame *frame, *safe; - struct buffer_head *bh_new[DX_MAX_TREE_HEIGHT] = {0}; + struct iam_frame *frame, *safe; + struct buffer_head *bh_new[DX_MAX_TREE_HEIGHT] = {NULL}; u32 newblock[DX_MAX_TREE_HEIGHT] = {0}; struct dynlock_handle *lock[DX_MAX_TREE_HEIGHT] = {NULL,}; struct dynlock_handle *new_lock[DX_MAX_TREE_HEIGHT] = {NULL,}; @@ -1791,7 +1974,8 @@ int split_index_node(handle_t *handle, struct iam_path *path, /* Go back down, allocating blocks, locking them, and adding into * transaction... */ for (frame = safe + 1, i = 0; i < nr_splet; ++i, ++frame) { - bh_new[i] = ldiskfs_append (handle, dir, &newblock[i], &err); + bh_new[i] = iam_new_node(handle, path->ip_container, + &newblock[i], &err); do_corr(schedule()); if (!bh_new[i] || descr->id_ops->id_node_init(path->ip_container, @@ -1875,7 +2059,7 @@ int split_index_node(handle_t *handle, struct iam_path *path, ++ frame; assert_inv(dx_node_check(path, frame)); bh_new[0] = NULL; /* buffer head is "consumed" */ - err = ldiskfs_journal_get_write_access(handle, bh2); + err = ldiskfs_handle_dirty_metadata(handle, NULL, bh2); if (err) goto journal_error; do_corr(schedule()); @@ -1907,16 +2091,17 @@ int split_index_node(handle_t *handle, struct iam_path *path, dxtrace(dx_show_index ("node", frame->entries)); dxtrace(dx_show_index ("node", ((struct dx_node *) bh2->b_data)->entries)); - err = ldiskfs_journal_dirty_metadata(handle, bh2); + err = ldiskfs_handle_dirty_metadata(handle, NULL, bh2); if (err) goto journal_error; do_corr(schedule()); - err = ldiskfs_journal_dirty_metadata(handle, parent->bh); + err = ldiskfs_handle_dirty_metadata(handle, NULL, + parent->bh); if (err) goto journal_error; } do_corr(schedule()); - err = ldiskfs_journal_dirty_metadata(handle, bh); + err = ldiskfs_handle_dirty_metadata(handle, NULL, bh); if (err) goto journal_error; } @@ -2049,7 +2234,184 @@ int iam_it_rec_insert(handle_t *h, struct iam_iterator *it, it_keycmp(it, k) == 0)); return result; } -EXPORT_SYMBOL(iam_it_rec_insert); + +static inline int iam_idle_blocks_limit(struct inode *inode) +{ + return (inode->i_sb->s_blocksize - sizeof(struct iam_idle_head)) >> 2; +} + +/* + * If the leaf cannnot be recycled, we will lose one block for reusing. + * It is not a serious issue because it almost the same of non-recycle. + */ +static iam_ptr_t iam_index_shrink(handle_t *h, struct iam_path *p, + struct iam_leaf *l, struct buffer_head **bh) +{ + struct iam_container *c = p->ip_container; + struct inode *inode = c->ic_object; + struct iam_frame *frame = p->ip_frame; + struct iam_entry *entries; + struct iam_entry *pos; + struct dynlock_handle *lh; + int count; + int rc; + + if (c->ic_idle_failed) + return 0; + + if (unlikely(frame == NULL)) + return 0; + + if (!iam_leaf_empty(l)) + return 0; + + lh = iam_lock_htree(c, frame->curidx, DLT_WRITE); + if (lh == NULL) { + CWARN("%.16s: No memory to recycle idle blocks\n", + LDISKFS_SB(inode->i_sb)->s_es->s_volume_name); + return 0; + } + + rc = iam_txn_add(h, p, frame->bh); + if (rc != 0) { + iam_unlock_htree(c, lh); + return 0; + } + + iam_lock_bh(frame->bh); + entries = frame->entries; + count = dx_get_count(entries); + /* NOT shrink the last entry in the index node, which can be reused + * directly by next new node. */ + if (count == 2) { + iam_unlock_bh(frame->bh); + iam_unlock_htree(c, lh); + return 0; + } + + pos = iam_find_position(p, frame); + /* There may be some new leaf nodes have been added or empty leaf nodes + * have been shrinked during my delete operation. + * + * If the empty leaf is not under current index node because the index + * node has been split, then just skip the empty leaf, which is rare. */ + if (unlikely(frame->leaf != dx_get_block(p, pos))) { + iam_unlock_bh(frame->bh); + iam_unlock_htree(c, lh); + return 0; + } + + frame->at = pos; + if (frame->at < iam_entry_shift(p, entries, count - 1)) { + struct iam_entry *n = iam_entry_shift(p, frame->at, 1); + + memmove(frame->at, n, + (char *)iam_entry_shift(p, entries, count) - (char *)n); + frame->at_shifted = 1; + } + dx_set_count(entries, count - 1); + iam_unlock_bh(frame->bh); + rc = iam_txn_dirty(h, p, frame->bh); + iam_unlock_htree(c, lh); + if (rc != 0) + return 0; + + get_bh(l->il_bh); + *bh = l->il_bh; + return frame->leaf; +} + +static int +iam_install_idle_blocks(handle_t *h, struct iam_path *p, struct buffer_head *bh, + __u32 *idle_blocks, iam_ptr_t blk) +{ + struct iam_container *c = p->ip_container; + struct buffer_head *old = c->ic_idle_bh; + struct iam_idle_head *head; + int rc; + + head = (struct iam_idle_head *)(bh->b_data); + head->iih_magic = cpu_to_le16(IAM_IDLE_HEADER_MAGIC); + head->iih_count = 0; + head->iih_next = *idle_blocks; + /* The bh already get_write_accessed. */ + rc = iam_txn_dirty(h, p, bh); + if (rc != 0) + return rc; + + rc = iam_txn_add(h, p, c->ic_root_bh); + if (rc != 0) + return rc; + + iam_lock_bh(c->ic_root_bh); + *idle_blocks = cpu_to_le32(blk); + iam_unlock_bh(c->ic_root_bh); + rc = iam_txn_dirty(h, p, c->ic_root_bh); + if (rc == 0) { + /* NOT release old before new assigned. */ + get_bh(bh); + c->ic_idle_bh = bh; + brelse(old); + } else { + iam_lock_bh(c->ic_root_bh); + *idle_blocks = head->iih_next; + iam_unlock_bh(c->ic_root_bh); + } + return rc; +} + +/* + * If the leaf cannnot be recycled, we will lose one block for reusing. + * It is not a serious issue because it almost the same of non-recycle. + */ +static void iam_recycle_leaf(handle_t *h, struct iam_path *p, + struct buffer_head *bh, iam_ptr_t blk) +{ + struct iam_container *c = p->ip_container; + struct inode *inode = c->ic_object; + struct iam_idle_head *head; + __u32 *idle_blocks; + int count; + int rc; + + mutex_lock(&c->ic_idle_mutex); + if (unlikely(c->ic_idle_failed)) { + rc = -EFAULT; + goto unlock; + } + + idle_blocks = (__u32 *)(c->ic_root_bh->b_data + + c->ic_descr->id_root_gap + + sizeof(struct dx_countlimit)); + /* It is the first idle block. */ + if (c->ic_idle_bh == NULL) { + rc = iam_install_idle_blocks(h, p, bh, idle_blocks, blk); + goto unlock; + } + + head = (struct iam_idle_head *)(c->ic_idle_bh->b_data); + count = le16_to_cpu(head->iih_count); + /* Current ic_idle_bh is full, to be replaced by the leaf. */ + if (count == iam_idle_blocks_limit(inode)) { + rc = iam_install_idle_blocks(h, p, bh, idle_blocks, blk); + goto unlock; + } + + /* Just add to ic_idle_bh. */ + rc = iam_txn_add(h, p, c->ic_idle_bh); + if (rc != 0) + goto unlock; + + head->iih_blks[count] = cpu_to_le32(blk); + head->iih_count = cpu_to_le16(count + 1); + rc = iam_txn_dirty(h, p, c->ic_idle_bh); + +unlock: + mutex_unlock(&c->ic_idle_mutex); + if (rc != 0) + CWARN("%.16s: idle blocks failed, will lose the blk %u\n", + LDISKFS_SB(inode->i_sb)->s_es->s_volume_name, blk); +} /* * Delete record under iterator. @@ -2083,12 +2445,22 @@ int iam_it_rec_delete(handle_t *h, struct iam_iterator *it) if (result == 0) { iam_rec_del(leaf, it->ii_flags&IAM_IT_MOVE); result = iam_txn_dirty(h, path, leaf->il_bh); - if (result == 0 && iam_leaf_at_end(leaf) && - it->ii_flags&IAM_IT_MOVE) { - result = iam_it_next(it); - if (result > 0) - result = 0; - } + if (result == 0 && iam_leaf_at_end(leaf)) { + struct buffer_head *bh = NULL; + iam_ptr_t blk; + + blk = iam_index_shrink(h, path, leaf, &bh); + if (it->ii_flags & IAM_IT_MOVE) { + result = iam_it_next(it); + if (result > 0) + result = 0; + } + + if (bh != NULL) { + iam_recycle_leaf(h, path, bh, blk); + brelse(bh); + } + } } assert_inv(iam_leaf_check(leaf)); assert_inv(iam_path_check(path)); @@ -2096,7 +2468,6 @@ int iam_it_rec_delete(handle_t *h, struct iam_iterator *it) it_state(it) == IAM_IT_DETACHED); return result; } -EXPORT_SYMBOL(iam_it_rec_delete); /* * Convert iterator to cookie. @@ -2117,7 +2488,6 @@ iam_pos_t iam_it_store(const struct iam_iterator *it) result = 0; return *(iam_pos_t *)iam_it_ikey_get(it, (void *)&result); } -EXPORT_SYMBOL(iam_it_store); /* * Restore iterator from cookie. @@ -2134,7 +2504,6 @@ int iam_it_load(struct iam_iterator *it, iam_pos_t pos) assert_corr(iam_it_container(it)->ic_descr->id_ikey_size <= sizeof pos); return iam_it_iget(it, (struct iam_ikey *)&pos); } -EXPORT_SYMBOL(iam_it_load); /***********************************************************************/ /* invariants */ @@ -2145,7 +2514,7 @@ static inline int ptr_inside(void *base, size_t size, void *ptr) return (base <= ptr) && (ptr < base + size); } -int iam_frame_invariant(struct iam_frame *f) +static int iam_frame_invariant(struct iam_frame *f) { return (f->bh != NULL && @@ -2154,7 +2523,8 @@ int iam_frame_invariant(struct iam_frame *f) ptr_inside(f->bh->b_data, f->bh->b_size, f->at) && f->entries <= f->at); } -int iam_leaf_invariant(struct iam_leaf *l) + +static int iam_leaf_invariant(struct iam_leaf *l) { return l->il_bh != NULL && @@ -2164,7 +2534,7 @@ int iam_leaf_invariant(struct iam_leaf *l) l->il_entries <= l->il_at; } -int iam_path_invariant(struct iam_path *p) +static int iam_path_invariant(struct iam_path *p) { int i; @@ -2219,7 +2589,6 @@ int iam_lookup(struct iam_container *c, const struct iam_key *k, iam_it_fini(&it); return result; } -EXPORT_SYMBOL(iam_lookup); /* * Insert new record @r with key @k into container @c (within context of @@ -2248,7 +2617,6 @@ int iam_insert(handle_t *h, struct iam_container *c, const struct iam_key *k, iam_it_fini(&it); return result; } -EXPORT_SYMBOL(iam_insert); /* * Update record with the key @k in container @c (within context of @@ -2279,7 +2647,6 @@ int iam_update(handle_t *h, struct iam_container *c, const struct iam_key *k, iam_it_fini(&it); return result; } -EXPORT_SYMBOL(iam_update); /* * Delete existing record with key @k. @@ -2304,7 +2671,6 @@ int iam_delete(handle_t *h, struct iam_container *c, const struct iam_key *k, iam_it_fini(&it); return result; } -EXPORT_SYMBOL(iam_delete); int iam_root_limit(int rootgap, int blocksize, int size) {