[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/fs/reiserfs/stree.c b/ap/os/linux/linux-3.4.x/fs/reiserfs/stree.c
new file mode 100644
index 0000000..2f40a4c
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/reiserfs/stree.c
@@ -0,0 +1,2124 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+/*
+ * Written by Anatoly P. Pinchuk pap@namesys.botik.ru
+ * Programm System Institute
+ * Pereslavl-Zalessky Russia
+ */
+
+/*
+ * This file contains functions dealing with S+tree
+ *
+ * B_IS_IN_TREE
+ * copy_item_head
+ * comp_short_keys
+ * comp_keys
+ * comp_short_le_keys
+ * le_key2cpu_key
+ * comp_le_keys
+ * bin_search
+ * get_lkey
+ * get_rkey
+ * key_in_buffer
+ * decrement_bcount
+ * reiserfs_check_path
+ * pathrelse_and_restore
+ * pathrelse
+ * search_by_key_reada
+ * search_by_key
+ * search_for_position_by_key
+ * comp_items
+ * prepare_for_direct_item
+ * prepare_for_direntry_item
+ * prepare_for_delete_or_cut
+ * calc_deleted_bytes_number
+ * init_tb_struct
+ * padd_item
+ * reiserfs_delete_item
+ * reiserfs_delete_solid_item
+ * reiserfs_delete_object
+ * maybe_indirect_to_direct
+ * indirect_to_direct_roll_back
+ * reiserfs_cut_from_item
+ * truncate_directory
+ * reiserfs_do_truncate
+ * reiserfs_paste_into_item
+ * reiserfs_insert_item
+ */
+
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/pagemap.h>
+#include "reiserfs.h"
+#include <linux/buffer_head.h>
+#include <linux/quotaops.h>
+
+/* Does the buffer contain a disk block which is in the tree. */
+inline int B_IS_IN_TREE(const struct buffer_head *bh)
+{
+
+ RFALSE(B_LEVEL(bh) > MAX_HEIGHT,
+ "PAP-1010: block (%b) has too big level (%z)", bh, bh);
+
+ return (B_LEVEL(bh) != FREE_LEVEL);
+}
+
+//
+// to gets item head in le form
+//
+inline void copy_item_head(struct item_head *to,
+ const struct item_head *from)
+{
+ memcpy(to, from, IH_SIZE);
+}
+
+/* k1 is pointer to on-disk structure which is stored in little-endian
+ form. k2 is pointer to cpu variable. For key of items of the same
+ object this returns 0.
+ Returns: -1 if key1 < key2
+ 0 if key1 == key2
+ 1 if key1 > key2 */
+inline int comp_short_keys(const struct reiserfs_key *le_key,
+ const struct cpu_key *cpu_key)
+{
+ __u32 n;
+ n = le32_to_cpu(le_key->k_dir_id);
+ if (n < cpu_key->on_disk_key.k_dir_id)
+ return -1;
+ if (n > cpu_key->on_disk_key.k_dir_id)
+ return 1;
+ n = le32_to_cpu(le_key->k_objectid);
+ if (n < cpu_key->on_disk_key.k_objectid)
+ return -1;
+ if (n > cpu_key->on_disk_key.k_objectid)
+ return 1;
+ return 0;
+}
+
+/* k1 is pointer to on-disk structure which is stored in little-endian
+ form. k2 is pointer to cpu variable.
+ Compare keys using all 4 key fields.
+ Returns: -1 if key1 < key2 0
+ if key1 = key2 1 if key1 > key2 */
+static inline int comp_keys(const struct reiserfs_key *le_key,
+ const struct cpu_key *cpu_key)
+{
+ int retval;
+
+ retval = comp_short_keys(le_key, cpu_key);
+ if (retval)
+ return retval;
+ if (le_key_k_offset(le_key_version(le_key), le_key) <
+ cpu_key_k_offset(cpu_key))
+ return -1;
+ if (le_key_k_offset(le_key_version(le_key), le_key) >
+ cpu_key_k_offset(cpu_key))
+ return 1;
+
+ if (cpu_key->key_length == 3)
+ return 0;
+
+ /* this part is needed only when tail conversion is in progress */
+ if (le_key_k_type(le_key_version(le_key), le_key) <
+ cpu_key_k_type(cpu_key))
+ return -1;
+
+ if (le_key_k_type(le_key_version(le_key), le_key) >
+ cpu_key_k_type(cpu_key))
+ return 1;
+
+ return 0;
+}
+
+inline int comp_short_le_keys(const struct reiserfs_key *key1,
+ const struct reiserfs_key *key2)
+{
+ __u32 *k1_u32, *k2_u32;
+ int key_length = REISERFS_SHORT_KEY_LEN;
+
+ k1_u32 = (__u32 *) key1;
+ k2_u32 = (__u32 *) key2;
+ for (; key_length--; ++k1_u32, ++k2_u32) {
+ if (le32_to_cpu(*k1_u32) < le32_to_cpu(*k2_u32))
+ return -1;
+ if (le32_to_cpu(*k1_u32) > le32_to_cpu(*k2_u32))
+ return 1;
+ }
+ return 0;
+}
+
+inline void le_key2cpu_key(struct cpu_key *to, const struct reiserfs_key *from)
+{
+ int version;
+ to->on_disk_key.k_dir_id = le32_to_cpu(from->k_dir_id);
+ to->on_disk_key.k_objectid = le32_to_cpu(from->k_objectid);
+
+ // find out version of the key
+ version = le_key_version(from);
+ to->version = version;
+ to->on_disk_key.k_offset = le_key_k_offset(version, from);
+ to->on_disk_key.k_type = le_key_k_type(version, from);
+}
+
+// this does not say which one is bigger, it only returns 1 if keys
+// are not equal, 0 otherwise
+inline int comp_le_keys(const struct reiserfs_key *k1,
+ const struct reiserfs_key *k2)
+{
+ return memcmp(k1, k2, sizeof(struct reiserfs_key));
+}
+
+/**************************************************************************
+ * Binary search toolkit function *
+ * Search for an item in the array by the item key *
+ * Returns: 1 if found, 0 if not found; *
+ * *pos = number of the searched element if found, else the *
+ * number of the first element that is larger than key. *
+ **************************************************************************/
+/* For those not familiar with binary search: lbound is the leftmost item that it
+ could be, rbound the rightmost item that it could be. We examine the item
+ halfway between lbound and rbound, and that tells us either that we can increase
+ lbound, or decrease rbound, or that we have found it, or if lbound <= rbound that
+ there are no possible items, and we have not found it. With each examination we
+ cut the number of possible items it could be by one more than half rounded down,
+ or we find it. */
+static inline int bin_search(const void *key, /* Key to search for. */
+ const void *base, /* First item in the array. */
+ int num, /* Number of items in the array. */
+ int width, /* Item size in the array.
+ searched. Lest the reader be
+ confused, note that this is crafted
+ as a general function, and when it
+ is applied specifically to the array
+ of item headers in a node, width
+ is actually the item header size not
+ the item size. */
+ int *pos /* Number of the searched for element. */
+ )
+{
+ int rbound, lbound, j;
+
+ for (j = ((rbound = num - 1) + (lbound = 0)) / 2;
+ lbound <= rbound; j = (rbound + lbound) / 2)
+ switch (comp_keys
+ ((struct reiserfs_key *)((char *)base + j * width),
+ (struct cpu_key *)key)) {
+ case -1:
+ lbound = j + 1;
+ continue;
+ case 1:
+ rbound = j - 1;
+ continue;
+ case 0:
+ *pos = j;
+ return ITEM_FOUND; /* Key found in the array. */
+ }
+
+ /* bin_search did not find given key, it returns position of key,
+ that is minimal and greater than the given one. */
+ *pos = lbound;
+ return ITEM_NOT_FOUND;
+}
+
+
+/* Minimal possible key. It is never in the tree. */
+const struct reiserfs_key MIN_KEY = { 0, 0, {{0, 0},} };
+
+/* Maximal possible key. It is never in the tree. */
+static const struct reiserfs_key MAX_KEY = {
+ __constant_cpu_to_le32(0xffffffff),
+ __constant_cpu_to_le32(0xffffffff),
+ {{__constant_cpu_to_le32(0xffffffff),
+ __constant_cpu_to_le32(0xffffffff)},}
+};
+
+/* Get delimiting key of the buffer by looking for it in the buffers in the path, starting from the bottom
+ of the path, and going upwards. We must check the path's validity at each step. If the key is not in
+ the path, there is no delimiting key in the tree (buffer is first or last buffer in tree), and in this
+ case we return a special key, either MIN_KEY or MAX_KEY. */
+static inline const struct reiserfs_key *get_lkey(const struct treepath *chk_path,
+ const struct super_block *sb)
+{
+ int position, path_offset = chk_path->path_length;
+ struct buffer_head *parent;
+
+ RFALSE(path_offset < FIRST_PATH_ELEMENT_OFFSET,
+ "PAP-5010: invalid offset in the path");
+
+ /* While not higher in path than first element. */
+ while (path_offset-- > FIRST_PATH_ELEMENT_OFFSET) {
+
+ RFALSE(!buffer_uptodate
+ (PATH_OFFSET_PBUFFER(chk_path, path_offset)),
+ "PAP-5020: parent is not uptodate");
+
+ /* Parent at the path is not in the tree now. */
+ if (!B_IS_IN_TREE
+ (parent =
+ PATH_OFFSET_PBUFFER(chk_path, path_offset)))
+ return &MAX_KEY;
+ /* Check whether position in the parent is correct. */
+ if ((position =
+ PATH_OFFSET_POSITION(chk_path,
+ path_offset)) >
+ B_NR_ITEMS(parent))
+ return &MAX_KEY;
+ /* Check whether parent at the path really points to the child. */
+ if (B_N_CHILD_NUM(parent, position) !=
+ PATH_OFFSET_PBUFFER(chk_path,
+ path_offset + 1)->b_blocknr)
+ return &MAX_KEY;
+ /* Return delimiting key if position in the parent is not equal to zero. */
+ if (position)
+ return B_N_PDELIM_KEY(parent, position - 1);
+ }
+ /* Return MIN_KEY if we are in the root of the buffer tree. */
+ if (PATH_OFFSET_PBUFFER(chk_path, FIRST_PATH_ELEMENT_OFFSET)->
+ b_blocknr == SB_ROOT_BLOCK(sb))
+ return &MIN_KEY;
+ return &MAX_KEY;
+}
+
+/* Get delimiting key of the buffer at the path and its right neighbor. */
+inline const struct reiserfs_key *get_rkey(const struct treepath *chk_path,
+ const struct super_block *sb)
+{
+ int position, path_offset = chk_path->path_length;
+ struct buffer_head *parent;
+
+ RFALSE(path_offset < FIRST_PATH_ELEMENT_OFFSET,
+ "PAP-5030: invalid offset in the path");
+
+ while (path_offset-- > FIRST_PATH_ELEMENT_OFFSET) {
+
+ RFALSE(!buffer_uptodate
+ (PATH_OFFSET_PBUFFER(chk_path, path_offset)),
+ "PAP-5040: parent is not uptodate");
+
+ /* Parent at the path is not in the tree now. */
+ if (!B_IS_IN_TREE
+ (parent =
+ PATH_OFFSET_PBUFFER(chk_path, path_offset)))
+ return &MIN_KEY;
+ /* Check whether position in the parent is correct. */
+ if ((position =
+ PATH_OFFSET_POSITION(chk_path,
+ path_offset)) >
+ B_NR_ITEMS(parent))
+ return &MIN_KEY;
+ /* Check whether parent at the path really points to the child. */
+ if (B_N_CHILD_NUM(parent, position) !=
+ PATH_OFFSET_PBUFFER(chk_path,
+ path_offset + 1)->b_blocknr)
+ return &MIN_KEY;
+ /* Return delimiting key if position in the parent is not the last one. */
+ if (position != B_NR_ITEMS(parent))
+ return B_N_PDELIM_KEY(parent, position);
+ }
+ /* Return MAX_KEY if we are in the root of the buffer tree. */
+ if (PATH_OFFSET_PBUFFER(chk_path, FIRST_PATH_ELEMENT_OFFSET)->
+ b_blocknr == SB_ROOT_BLOCK(sb))
+ return &MAX_KEY;
+ return &MIN_KEY;
+}
+
+/* Check whether a key is contained in the tree rooted from a buffer at a path. */
+/* This works by looking at the left and right delimiting keys for the buffer in the last path_element in
+ the path. These delimiting keys are stored at least one level above that buffer in the tree. If the
+ buffer is the first or last node in the tree order then one of the delimiting keys may be absent, and in
+ this case get_lkey and get_rkey return a special key which is MIN_KEY or MAX_KEY. */
+static inline int key_in_buffer(struct treepath *chk_path, /* Path which should be checked. */
+ const struct cpu_key *key, /* Key which should be checked. */
+ struct super_block *sb
+ )
+{
+
+ RFALSE(!key || chk_path->path_length < FIRST_PATH_ELEMENT_OFFSET
+ || chk_path->path_length > MAX_HEIGHT,
+ "PAP-5050: pointer to the key(%p) is NULL or invalid path length(%d)",
+ key, chk_path->path_length);
+ RFALSE(!PATH_PLAST_BUFFER(chk_path)->b_bdev,
+ "PAP-5060: device must not be NODEV");
+
+ if (comp_keys(get_lkey(chk_path, sb), key) == 1)
+ /* left delimiting key is bigger, that the key we look for */
+ return 0;
+ /* if ( comp_keys(key, get_rkey(chk_path, sb)) != -1 ) */
+ if (comp_keys(get_rkey(chk_path, sb), key) != 1)
+ /* key must be less than right delimitiing key */
+ return 0;
+ return 1;
+}
+
+int reiserfs_check_path(struct treepath *p)
+{
+ RFALSE(p->path_length != ILLEGAL_PATH_ELEMENT_OFFSET,
+ "path not properly relsed");
+ return 0;
+}
+
+/* Drop the reference to each buffer in a path and restore
+ * dirty bits clean when preparing the buffer for the log.
+ * This version should only be called from fix_nodes() */
+void pathrelse_and_restore(struct super_block *sb,
+ struct treepath *search_path)
+{
+ int path_offset = search_path->path_length;
+
+ RFALSE(path_offset < ILLEGAL_PATH_ELEMENT_OFFSET,
+ "clm-4000: invalid path offset");
+
+ while (path_offset > ILLEGAL_PATH_ELEMENT_OFFSET) {
+ struct buffer_head *bh;
+ bh = PATH_OFFSET_PBUFFER(search_path, path_offset--);
+ reiserfs_restore_prepared_buffer(sb, bh);
+ brelse(bh);
+ }
+ search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
+}
+
+/* Drop the reference to each buffer in a path */
+void pathrelse(struct treepath *search_path)
+{
+ int path_offset = search_path->path_length;
+
+ RFALSE(path_offset < ILLEGAL_PATH_ELEMENT_OFFSET,
+ "PAP-5090: invalid path offset");
+
+ while (path_offset > ILLEGAL_PATH_ELEMENT_OFFSET)
+ brelse(PATH_OFFSET_PBUFFER(search_path, path_offset--));
+
+ search_path->path_length = ILLEGAL_PATH_ELEMENT_OFFSET;
+}
+
+static int is_leaf(char *buf, int blocksize, struct buffer_head *bh)
+{
+ struct block_head *blkh;
+ struct item_head *ih;
+ int used_space;
+ int prev_location;
+ int i;
+ int nr;
+
+ blkh = (struct block_head *)buf;
+ if (blkh_level(blkh) != DISK_LEAF_NODE_LEVEL) {
+ reiserfs_warning(NULL, "reiserfs-5080",
+ "this should be caught earlier");
+ return 0;
+ }
+
+ nr = blkh_nr_item(blkh);
+ if (nr < 1 || nr > ((blocksize - BLKH_SIZE) / (IH_SIZE + MIN_ITEM_LEN))) {
+ /* item number is too big or too small */
+ reiserfs_warning(NULL, "reiserfs-5081",
+ "nr_item seems wrong: %z", bh);
+ return 0;
+ }
+ ih = (struct item_head *)(buf + BLKH_SIZE) + nr - 1;
+ used_space = BLKH_SIZE + IH_SIZE * nr + (blocksize - ih_location(ih));
+ if (used_space != blocksize - blkh_free_space(blkh)) {
+ /* free space does not match to calculated amount of use space */
+ reiserfs_warning(NULL, "reiserfs-5082",
+ "free space seems wrong: %z", bh);
+ return 0;
+ }
+ // FIXME: it is_leaf will hit performance too much - we may have
+ // return 1 here
+
+ /* check tables of item heads */
+ ih = (struct item_head *)(buf + BLKH_SIZE);
+ prev_location = blocksize;
+ for (i = 0; i < nr; i++, ih++) {
+ if (le_ih_k_type(ih) == TYPE_ANY) {
+ reiserfs_warning(NULL, "reiserfs-5083",
+ "wrong item type for item %h",
+ ih);
+ return 0;
+ }
+ if (ih_location(ih) >= blocksize
+ || ih_location(ih) < IH_SIZE * nr) {
+ reiserfs_warning(NULL, "reiserfs-5084",
+ "item location seems wrong: %h",
+ ih);
+ return 0;
+ }
+ if (ih_item_len(ih) < 1
+ || ih_item_len(ih) > MAX_ITEM_LEN(blocksize)) {
+ reiserfs_warning(NULL, "reiserfs-5085",
+ "item length seems wrong: %h",
+ ih);
+ return 0;
+ }
+ if (prev_location - ih_location(ih) != ih_item_len(ih)) {
+ reiserfs_warning(NULL, "reiserfs-5086",
+ "item location seems wrong "
+ "(second one): %h", ih);
+ return 0;
+ }
+ prev_location = ih_location(ih);
+ }
+
+ // one may imagine much more checks
+ return 1;
+}
+
+/* returns 1 if buf looks like an internal node, 0 otherwise */
+static int is_internal(char *buf, int blocksize, struct buffer_head *bh)
+{
+ struct block_head *blkh;
+ int nr;
+ int used_space;
+
+ blkh = (struct block_head *)buf;
+ nr = blkh_level(blkh);
+ if (nr <= DISK_LEAF_NODE_LEVEL || nr > MAX_HEIGHT) {
+ /* this level is not possible for internal nodes */
+ reiserfs_warning(NULL, "reiserfs-5087",
+ "this should be caught earlier");
+ return 0;
+ }
+
+ nr = blkh_nr_item(blkh);
+ if (nr > (blocksize - BLKH_SIZE - DC_SIZE) / (KEY_SIZE + DC_SIZE)) {
+ /* for internal which is not root we might check min number of keys */
+ reiserfs_warning(NULL, "reiserfs-5088",
+ "number of key seems wrong: %z", bh);
+ return 0;
+ }
+
+ used_space = BLKH_SIZE + KEY_SIZE * nr + DC_SIZE * (nr + 1);
+ if (used_space != blocksize - blkh_free_space(blkh)) {
+ reiserfs_warning(NULL, "reiserfs-5089",
+ "free space seems wrong: %z", bh);
+ return 0;
+ }
+ // one may imagine much more checks
+ return 1;
+}
+
+// make sure that bh contains formatted node of reiserfs tree of
+// 'level'-th level
+static int is_tree_node(struct buffer_head *bh, int level)
+{
+ if (B_LEVEL(bh) != level) {
+ reiserfs_warning(NULL, "reiserfs-5090", "node level %d does "
+ "not match to the expected one %d",
+ B_LEVEL(bh), level);
+ return 0;
+ }
+ if (level == DISK_LEAF_NODE_LEVEL)
+ return is_leaf(bh->b_data, bh->b_size, bh);
+
+ return is_internal(bh->b_data, bh->b_size, bh);
+}
+
+#define SEARCH_BY_KEY_READA 16
+
+/*
+ * The function is NOT SCHEDULE-SAFE!
+ * It might unlock the write lock if we needed to wait for a block
+ * to be read. Note that in this case it won't recover the lock to avoid
+ * high contention resulting from too much lock requests, especially
+ * the caller (search_by_key) will perform other schedule-unsafe
+ * operations just after calling this function.
+ *
+ * @return true if we have unlocked
+ */
+static bool search_by_key_reada(struct super_block *s,
+ struct buffer_head **bh,
+ b_blocknr_t *b, int num)
+{
+ int i, j;
+ bool unlocked = false;
+
+ for (i = 0; i < num; i++) {
+ bh[i] = sb_getblk(s, b[i]);
+ }
+ /*
+ * We are going to read some blocks on which we
+ * have a reference. It's safe, though we might be
+ * reading blocks concurrently changed if we release
+ * the lock. But it's still fine because we check later
+ * if the tree changed
+ */
+ for (j = 0; j < i; j++) {
+ /*
+ * note, this needs attention if we are getting rid of the BKL
+ * you have to make sure the prepared bit isn't set on this buffer
+ */
+ if (!buffer_uptodate(bh[j])) {
+ if (!unlocked) {
+ reiserfs_write_unlock(s);
+ unlocked = true;
+ }
+ ll_rw_block(READA, 1, bh + j);
+ }
+ brelse(bh[j]);
+ }
+ return unlocked;
+}
+
+/**************************************************************************
+ * Algorithm SearchByKey *
+ * look for item in the Disk S+Tree by its key *
+ * Input: sb - super block *
+ * key - pointer to the key to search *
+ * Output: ITEM_FOUND, ITEM_NOT_FOUND or IO_ERROR *
+ * search_path - path from the root to the needed leaf *
+ **************************************************************************/
+
+/* This function fills up the path from the root to the leaf as it
+ descends the tree looking for the key. It uses reiserfs_bread to
+ try to find buffers in the cache given their block number. If it
+ does not find them in the cache it reads them from disk. For each
+ node search_by_key finds using reiserfs_bread it then uses
+ bin_search to look through that node. bin_search will find the
+ position of the block_number of the next node if it is looking
+ through an internal node. If it is looking through a leaf node
+ bin_search will find the position of the item which has key either
+ equal to given key, or which is the maximal key less than the given
+ key. search_by_key returns a path that must be checked for the
+ correctness of the top of the path but need not be checked for the
+ correctness of the bottom of the path */
+/* The function is NOT SCHEDULE-SAFE! */
+int search_by_key(struct super_block *sb, const struct cpu_key *key, /* Key to search. */
+ struct treepath *search_path,/* This structure was
+ allocated and initialized
+ by the calling
+ function. It is filled up
+ by this function. */
+ int stop_level /* How far down the tree to search. To
+ stop at leaf level - set to
+ DISK_LEAF_NODE_LEVEL */
+ )
+{
+ b_blocknr_t block_number;
+ int expected_level;
+ struct buffer_head *bh;
+ struct path_element *last_element;
+ int node_level, retval;
+ int right_neighbor_of_leaf_node;
+ int fs_gen;
+ struct buffer_head *reada_bh[SEARCH_BY_KEY_READA];
+ b_blocknr_t reada_blocks[SEARCH_BY_KEY_READA];
+ int reada_count = 0;
+
+#ifdef CONFIG_REISERFS_CHECK
+ int repeat_counter = 0;
+#endif
+
+ PROC_INFO_INC(sb, search_by_key);
+
+ /* As we add each node to a path we increase its count. This means that
+ we must be careful to release all nodes in a path before we either
+ discard the path struct or re-use the path struct, as we do here. */
+
+ pathrelse(search_path);
+
+ right_neighbor_of_leaf_node = 0;
+
+ /* With each iteration of this loop we search through the items in the
+ current node, and calculate the next current node(next path element)
+ for the next iteration of this loop.. */
+ block_number = SB_ROOT_BLOCK(sb);
+ expected_level = -1;
+ while (1) {
+
+#ifdef CONFIG_REISERFS_CHECK
+ if (!(++repeat_counter % 50000))
+ reiserfs_warning(sb, "PAP-5100",
+ "%s: there were %d iterations of "
+ "while loop looking for key %K",
+ current->comm, repeat_counter,
+ key);
+#endif
+
+ /* prep path to have another element added to it. */
+ last_element =
+ PATH_OFFSET_PELEMENT(search_path,
+ ++search_path->path_length);
+ fs_gen = get_generation(sb);
+
+ /* Read the next tree node, and set the last element in the path to
+ have a pointer to it. */
+ if ((bh = last_element->pe_buffer =
+ sb_getblk(sb, block_number))) {
+ bool unlocked = false;
+
+ if (!buffer_uptodate(bh) && reada_count > 1)
+ /* may unlock the write lock */
+ unlocked = search_by_key_reada(sb, reada_bh,
+ reada_blocks, reada_count);
+ /*
+ * If we haven't already unlocked the write lock,
+ * then we need to do that here before reading
+ * the current block
+ */
+ if (!buffer_uptodate(bh) && !unlocked) {
+ reiserfs_write_unlock(sb);
+ unlocked = true;
+ }
+ ll_rw_block(READ, 1, &bh);
+ wait_on_buffer(bh);
+
+ if (unlocked)
+ reiserfs_write_lock(sb);
+ if (!buffer_uptodate(bh))
+ goto io_error;
+ } else {
+ io_error:
+ search_path->path_length--;
+ pathrelse(search_path);
+ return IO_ERROR;
+ }
+ reada_count = 0;
+ if (expected_level == -1)
+ expected_level = SB_TREE_HEIGHT(sb);
+ expected_level--;
+
+ /* It is possible that schedule occurred. We must check whether the key
+ to search is still in the tree rooted from the current buffer. If
+ not then repeat search from the root. */
+ if (fs_changed(fs_gen, sb) &&
+ (!B_IS_IN_TREE(bh) ||
+ B_LEVEL(bh) != expected_level ||
+ !key_in_buffer(search_path, key, sb))) {
+ PROC_INFO_INC(sb, search_by_key_fs_changed);
+ PROC_INFO_INC(sb, search_by_key_restarted);
+ PROC_INFO_INC(sb,
+ sbk_restarted[expected_level - 1]);
+ pathrelse(search_path);
+
+ /* Get the root block number so that we can repeat the search
+ starting from the root. */
+ block_number = SB_ROOT_BLOCK(sb);
+ expected_level = -1;
+ right_neighbor_of_leaf_node = 0;
+
+ /* repeat search from the root */
+ continue;
+ }
+
+ /* only check that the key is in the buffer if key is not
+ equal to the MAX_KEY. Latter case is only possible in
+ "finish_unfinished()" processing during mount. */
+ RFALSE(comp_keys(&MAX_KEY, key) &&
+ !key_in_buffer(search_path, key, sb),
+ "PAP-5130: key is not in the buffer");
+#ifdef CONFIG_REISERFS_CHECK
+ if (REISERFS_SB(sb)->cur_tb) {
+ print_cur_tb("5140");
+ reiserfs_panic(sb, "PAP-5140",
+ "schedule occurred in do_balance!");
+ }
+#endif
+
+ // make sure, that the node contents look like a node of
+ // certain level
+ if (!is_tree_node(bh, expected_level)) {
+ reiserfs_error(sb, "vs-5150",
+ "invalid format found in block %ld. "
+ "Fsck?", bh->b_blocknr);
+ pathrelse(search_path);
+ return IO_ERROR;
+ }
+
+ /* ok, we have acquired next formatted node in the tree */
+ node_level = B_LEVEL(bh);
+
+ PROC_INFO_BH_STAT(sb, bh, node_level - 1);
+
+ RFALSE(node_level < stop_level,
+ "vs-5152: tree level (%d) is less than stop level (%d)",
+ node_level, stop_level);
+
+ retval = bin_search(key, B_N_PITEM_HEAD(bh, 0),
+ B_NR_ITEMS(bh),
+ (node_level ==
+ DISK_LEAF_NODE_LEVEL) ? IH_SIZE :
+ KEY_SIZE,
+ &(last_element->pe_position));
+ if (node_level == stop_level) {
+ return retval;
+ }
+
+ /* we are not in the stop level */
+ if (retval == ITEM_FOUND)
+ /* item has been found, so we choose the pointer which is to the right of the found one */
+ last_element->pe_position++;
+
+ /* if item was not found we choose the position which is to
+ the left of the found item. This requires no code,
+ bin_search did it already. */
+
+ /* So we have chosen a position in the current node which is
+ an internal node. Now we calculate child block number by
+ position in the node. */
+ block_number =
+ B_N_CHILD_NUM(bh, last_element->pe_position);
+
+ /* if we are going to read leaf nodes, try for read ahead as well */
+ if ((search_path->reada & PATH_READA) &&
+ node_level == DISK_LEAF_NODE_LEVEL + 1) {
+ int pos = last_element->pe_position;
+ int limit = B_NR_ITEMS(bh);
+ struct reiserfs_key *le_key;
+
+ if (search_path->reada & PATH_READA_BACK)
+ limit = 0;
+ while (reada_count < SEARCH_BY_KEY_READA) {
+ if (pos == limit)
+ break;
+ reada_blocks[reada_count++] =
+ B_N_CHILD_NUM(bh, pos);
+ if (search_path->reada & PATH_READA_BACK)
+ pos--;
+ else
+ pos++;
+
+ /*
+ * check to make sure we're in the same object
+ */
+ le_key = B_N_PDELIM_KEY(bh, pos);
+ if (le32_to_cpu(le_key->k_objectid) !=
+ key->on_disk_key.k_objectid) {
+ break;
+ }
+ }
+ }
+ }
+}
+
+/* Form the path to an item and position in this item which contains
+ file byte defined by key. If there is no such item
+ corresponding to the key, we point the path to the item with
+ maximal key less than key, and *pos_in_item is set to one
+ past the last entry/byte in the item. If searching for entry in a
+ directory item, and it is not found, *pos_in_item is set to one
+ entry more than the entry with maximal key which is less than the
+ sought key.
+
+ Note that if there is no entry in this same node which is one more,
+ then we point to an imaginary entry. for direct items, the
+ position is in units of bytes, for indirect items the position is
+ in units of blocknr entries, for directory items the position is in
+ units of directory entries. */
+
+/* The function is NOT SCHEDULE-SAFE! */
+int search_for_position_by_key(struct super_block *sb, /* Pointer to the super block. */
+ const struct cpu_key *p_cpu_key, /* Key to search (cpu variable) */
+ struct treepath *search_path /* Filled up by this function. */
+ )
+{
+ struct item_head *p_le_ih; /* pointer to on-disk structure */
+ int blk_size;
+ loff_t item_offset, offset;
+ struct reiserfs_dir_entry de;
+ int retval;
+
+ /* If searching for directory entry. */
+ if (is_direntry_cpu_key(p_cpu_key))
+ return search_by_entry_key(sb, p_cpu_key, search_path,
+ &de);
+
+ /* If not searching for directory entry. */
+
+ /* If item is found. */
+ retval = search_item(sb, p_cpu_key, search_path);
+ if (retval == IO_ERROR)
+ return retval;
+ if (retval == ITEM_FOUND) {
+
+ RFALSE(!ih_item_len
+ (B_N_PITEM_HEAD
+ (PATH_PLAST_BUFFER(search_path),
+ PATH_LAST_POSITION(search_path))),
+ "PAP-5165: item length equals zero");
+
+ pos_in_item(search_path) = 0;
+ return POSITION_FOUND;
+ }
+
+ RFALSE(!PATH_LAST_POSITION(search_path),
+ "PAP-5170: position equals zero");
+
+ /* Item is not found. Set path to the previous item. */
+ p_le_ih =
+ B_N_PITEM_HEAD(PATH_PLAST_BUFFER(search_path),
+ --PATH_LAST_POSITION(search_path));
+ blk_size = sb->s_blocksize;
+
+ if (comp_short_keys(&(p_le_ih->ih_key), p_cpu_key)) {
+ return FILE_NOT_FOUND;
+ }
+ // FIXME: quite ugly this far
+
+ item_offset = le_ih_k_offset(p_le_ih);
+ offset = cpu_key_k_offset(p_cpu_key);
+
+ /* Needed byte is contained in the item pointed to by the path. */
+ if (item_offset <= offset &&
+ item_offset + op_bytes_number(p_le_ih, blk_size) > offset) {
+ pos_in_item(search_path) = offset - item_offset;
+ if (is_indirect_le_ih(p_le_ih)) {
+ pos_in_item(search_path) /= blk_size;
+ }
+ return POSITION_FOUND;
+ }
+
+ /* Needed byte is not contained in the item pointed to by the
+ path. Set pos_in_item out of the item. */
+ if (is_indirect_le_ih(p_le_ih))
+ pos_in_item(search_path) =
+ ih_item_len(p_le_ih) / UNFM_P_SIZE;
+ else
+ pos_in_item(search_path) = ih_item_len(p_le_ih);
+
+ return POSITION_NOT_FOUND;
+}
+
+/* Compare given item and item pointed to by the path. */
+int comp_items(const struct item_head *stored_ih, const struct treepath *path)
+{
+ struct buffer_head *bh = PATH_PLAST_BUFFER(path);
+ struct item_head *ih;
+
+ /* Last buffer at the path is not in the tree. */
+ if (!B_IS_IN_TREE(bh))
+ return 1;
+
+ /* Last path position is invalid. */
+ if (PATH_LAST_POSITION(path) >= B_NR_ITEMS(bh))
+ return 1;
+
+ /* we need only to know, whether it is the same item */
+ ih = get_ih(path);
+ return memcmp(stored_ih, ih, IH_SIZE);
+}
+
+/* unformatted nodes are not logged anymore, ever. This is safe
+** now
+*/
+#define held_by_others(bh) (atomic_read(&(bh)->b_count) > 1)
+
+// block can not be forgotten as it is in I/O or held by someone
+#define block_in_use(bh) (buffer_locked(bh) || (held_by_others(bh)))
+
+// prepare for delete or cut of direct item
+static inline int prepare_for_direct_item(struct treepath *path,
+ struct item_head *le_ih,
+ struct inode *inode,
+ loff_t new_file_length, int *cut_size)
+{
+ loff_t round_len;
+
+ if (new_file_length == max_reiserfs_offset(inode)) {
+ /* item has to be deleted */
+ *cut_size = -(IH_SIZE + ih_item_len(le_ih));
+ return M_DELETE;
+ }
+ // new file gets truncated
+ if (get_inode_item_key_version(inode) == KEY_FORMAT_3_6) {
+ //
+ round_len = ROUND_UP(new_file_length);
+ /* this was new_file_length < le_ih ... */
+ if (round_len < le_ih_k_offset(le_ih)) {
+ *cut_size = -(IH_SIZE + ih_item_len(le_ih));
+ return M_DELETE; /* Delete this item. */
+ }
+ /* Calculate first position and size for cutting from item. */
+ pos_in_item(path) = round_len - (le_ih_k_offset(le_ih) - 1);
+ *cut_size = -(ih_item_len(le_ih) - pos_in_item(path));
+
+ return M_CUT; /* Cut from this item. */
+ }
+
+ // old file: items may have any length
+
+ if (new_file_length < le_ih_k_offset(le_ih)) {
+ *cut_size = -(IH_SIZE + ih_item_len(le_ih));
+ return M_DELETE; /* Delete this item. */
+ }
+ /* Calculate first position and size for cutting from item. */
+ *cut_size = -(ih_item_len(le_ih) -
+ (pos_in_item(path) =
+ new_file_length + 1 - le_ih_k_offset(le_ih)));
+ return M_CUT; /* Cut from this item. */
+}
+
+static inline int prepare_for_direntry_item(struct treepath *path,
+ struct item_head *le_ih,
+ struct inode *inode,
+ loff_t new_file_length,
+ int *cut_size)
+{
+ if (le_ih_k_offset(le_ih) == DOT_OFFSET &&
+ new_file_length == max_reiserfs_offset(inode)) {
+ RFALSE(ih_entry_count(le_ih) != 2,
+ "PAP-5220: incorrect empty directory item (%h)", le_ih);
+ *cut_size = -(IH_SIZE + ih_item_len(le_ih));
+ return M_DELETE; /* Delete the directory item containing "." and ".." entry. */
+ }
+
+ if (ih_entry_count(le_ih) == 1) {
+ /* Delete the directory item such as there is one record only
+ in this item */
+ *cut_size = -(IH_SIZE + ih_item_len(le_ih));
+ return M_DELETE;
+ }
+
+ /* Cut one record from the directory item. */
+ *cut_size =
+ -(DEH_SIZE +
+ entry_length(get_last_bh(path), le_ih, pos_in_item(path)));
+ return M_CUT;
+}
+
+#define JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD (2 * JOURNAL_PER_BALANCE_CNT + 1)
+
+/* If the path points to a directory or direct item, calculate mode and the size cut, for balance.
+ If the path points to an indirect item, remove some number of its unformatted nodes.
+ In case of file truncate calculate whether this item must be deleted/truncated or last
+ unformatted node of this item will be converted to a direct item.
+ This function returns a determination of what balance mode the calling function should employ. */
+static char prepare_for_delete_or_cut(struct reiserfs_transaction_handle *th, struct inode *inode, struct treepath *path, const struct cpu_key *item_key, int *removed, /* Number of unformatted nodes which were removed
+ from end of the file. */
+ int *cut_size, unsigned long long new_file_length /* MAX_KEY_OFFSET in case of delete. */
+ )
+{
+ struct super_block *sb = inode->i_sb;
+ struct item_head *p_le_ih = PATH_PITEM_HEAD(path);
+ struct buffer_head *bh = PATH_PLAST_BUFFER(path);
+
+ BUG_ON(!th->t_trans_id);
+
+ /* Stat_data item. */
+ if (is_statdata_le_ih(p_le_ih)) {
+
+ RFALSE(new_file_length != max_reiserfs_offset(inode),
+ "PAP-5210: mode must be M_DELETE");
+
+ *cut_size = -(IH_SIZE + ih_item_len(p_le_ih));
+ return M_DELETE;
+ }
+
+ /* Directory item. */
+ if (is_direntry_le_ih(p_le_ih))
+ return prepare_for_direntry_item(path, p_le_ih, inode,
+ new_file_length,
+ cut_size);
+
+ /* Direct item. */
+ if (is_direct_le_ih(p_le_ih))
+ return prepare_for_direct_item(path, p_le_ih, inode,
+ new_file_length, cut_size);
+
+ /* Case of an indirect item. */
+ {
+ int blk_size = sb->s_blocksize;
+ struct item_head s_ih;
+ int need_re_search;
+ int delete = 0;
+ int result = M_CUT;
+ int pos = 0;
+
+ if ( new_file_length == max_reiserfs_offset (inode) ) {
+ /* prepare_for_delete_or_cut() is called by
+ * reiserfs_delete_item() */
+ new_file_length = 0;
+ delete = 1;
+ }
+
+ do {
+ need_re_search = 0;
+ *cut_size = 0;
+ bh = PATH_PLAST_BUFFER(path);
+ copy_item_head(&s_ih, PATH_PITEM_HEAD(path));
+ pos = I_UNFM_NUM(&s_ih);
+
+ while (le_ih_k_offset (&s_ih) + (pos - 1) * blk_size > new_file_length) {
+ __le32 *unfm;
+ __u32 block;
+
+ /* Each unformatted block deletion may involve one additional
+ * bitmap block into the transaction, thereby the initial
+ * journal space reservation might not be enough. */
+ if (!delete && (*cut_size) != 0 &&
+ reiserfs_transaction_free_space(th) < JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD)
+ break;
+
+ unfm = (__le32 *)B_I_PITEM(bh, &s_ih) + pos - 1;
+ block = get_block_num(unfm, 0);
+
+ if (block != 0) {
+ reiserfs_prepare_for_journal(sb, bh, 1);
+ put_block_num(unfm, 0, 0);
+ journal_mark_dirty(th, sb, bh);
+ reiserfs_free_block(th, inode, block, 1);
+ }
+
+ reiserfs_write_unlock(sb);
+ cond_resched();
+ reiserfs_write_lock(sb);
+
+ if (item_moved (&s_ih, path)) {
+ need_re_search = 1;
+ break;
+ }
+
+ pos --;
+ (*removed)++;
+ (*cut_size) -= UNFM_P_SIZE;
+
+ if (pos == 0) {
+ (*cut_size) -= IH_SIZE;
+ result = M_DELETE;
+ break;
+ }
+ }
+ /* a trick. If the buffer has been logged, this will do nothing. If
+ ** we've broken the loop without logging it, it will restore the
+ ** buffer */
+ reiserfs_restore_prepared_buffer(sb, bh);
+ } while (need_re_search &&
+ search_for_position_by_key(sb, item_key, path) == POSITION_FOUND);
+ pos_in_item(path) = pos * UNFM_P_SIZE;
+
+ if (*cut_size == 0) {
+ /* Nothing were cut. maybe convert last unformatted node to the
+ * direct item? */
+ result = M_CONVERT;
+ }
+ return result;
+ }
+}
+
+/* Calculate number of bytes which will be deleted or cut during balance */
+static int calc_deleted_bytes_number(struct tree_balance *tb, char mode)
+{
+ int del_size;
+ struct item_head *p_le_ih = PATH_PITEM_HEAD(tb->tb_path);
+
+ if (is_statdata_le_ih(p_le_ih))
+ return 0;
+
+ del_size =
+ (mode ==
+ M_DELETE) ? ih_item_len(p_le_ih) : -tb->insert_size[0];
+ if (is_direntry_le_ih(p_le_ih)) {
+ /* return EMPTY_DIR_SIZE; We delete emty directoris only.
+ * we can't use EMPTY_DIR_SIZE, as old format dirs have a different
+ * empty size. ick. FIXME, is this right? */
+ return del_size;
+ }
+
+ if (is_indirect_le_ih(p_le_ih))
+ del_size = (del_size / UNFM_P_SIZE) *
+ (PATH_PLAST_BUFFER(tb->tb_path)->b_size);
+ return del_size;
+}
+
+static void init_tb_struct(struct reiserfs_transaction_handle *th,
+ struct tree_balance *tb,
+ struct super_block *sb,
+ struct treepath *path, int size)
+{
+
+ BUG_ON(!th->t_trans_id);
+
+ memset(tb, '\0', sizeof(struct tree_balance));
+ tb->transaction_handle = th;
+ tb->tb_sb = sb;
+ tb->tb_path = path;
+ PATH_OFFSET_PBUFFER(path, ILLEGAL_PATH_ELEMENT_OFFSET) = NULL;
+ PATH_OFFSET_POSITION(path, ILLEGAL_PATH_ELEMENT_OFFSET) = 0;
+ tb->insert_size[0] = size;
+}
+
+void padd_item(char *item, int total_length, int length)
+{
+ int i;
+
+ for (i = total_length; i > length;)
+ item[--i] = 0;
+}
+
+#ifdef REISERQUOTA_DEBUG
+char key2type(struct reiserfs_key *ih)
+{
+ if (is_direntry_le_key(2, ih))
+ return 'd';
+ if (is_direct_le_key(2, ih))
+ return 'D';
+ if (is_indirect_le_key(2, ih))
+ return 'i';
+ if (is_statdata_le_key(2, ih))
+ return 's';
+ return 'u';
+}
+
+char head2type(struct item_head *ih)
+{
+ if (is_direntry_le_ih(ih))
+ return 'd';
+ if (is_direct_le_ih(ih))
+ return 'D';
+ if (is_indirect_le_ih(ih))
+ return 'i';
+ if (is_statdata_le_ih(ih))
+ return 's';
+ return 'u';
+}
+#endif
+
+/* Delete object item.
+ * th - active transaction handle
+ * path - path to the deleted item
+ * item_key - key to search for the deleted item
+ * indode - used for updating i_blocks and quotas
+ * un_bh - NULL or unformatted node pointer
+ */
+int reiserfs_delete_item(struct reiserfs_transaction_handle *th,
+ struct treepath *path, const struct cpu_key *item_key,
+ struct inode *inode, struct buffer_head *un_bh)
+{
+ struct super_block *sb = inode->i_sb;
+ struct tree_balance s_del_balance;
+ struct item_head s_ih;
+ struct item_head *q_ih;
+ int quota_cut_bytes;
+ int ret_value, del_size, removed;
+
+#ifdef CONFIG_REISERFS_CHECK
+ char mode;
+ int iter = 0;
+#endif
+
+ BUG_ON(!th->t_trans_id);
+
+ init_tb_struct(th, &s_del_balance, sb, path,
+ 0 /*size is unknown */ );
+
+ while (1) {
+ removed = 0;
+
+#ifdef CONFIG_REISERFS_CHECK
+ iter++;
+ mode =
+#endif
+ prepare_for_delete_or_cut(th, inode, path,
+ item_key, &removed,
+ &del_size,
+ max_reiserfs_offset(inode));
+
+ RFALSE(mode != M_DELETE, "PAP-5320: mode must be M_DELETE");
+
+ copy_item_head(&s_ih, PATH_PITEM_HEAD(path));
+ s_del_balance.insert_size[0] = del_size;
+
+ ret_value = fix_nodes(M_DELETE, &s_del_balance, NULL, NULL);
+ if (ret_value != REPEAT_SEARCH)
+ break;
+
+ PROC_INFO_INC(sb, delete_item_restarted);
+
+ // file system changed, repeat search
+ ret_value =
+ search_for_position_by_key(sb, item_key, path);
+ if (ret_value == IO_ERROR)
+ break;
+ if (ret_value == FILE_NOT_FOUND) {
+ reiserfs_warning(sb, "vs-5340",
+ "no items of the file %K found",
+ item_key);
+ break;
+ }
+ } /* while (1) */
+
+ if (ret_value != CARRY_ON) {
+ unfix_nodes(&s_del_balance);
+ return 0;
+ }
+ // reiserfs_delete_item returns item length when success
+ ret_value = calc_deleted_bytes_number(&s_del_balance, M_DELETE);
+ q_ih = get_ih(path);
+ quota_cut_bytes = ih_item_len(q_ih);
+
+ /* hack so the quota code doesn't have to guess if the file
+ ** has a tail. On tail insert, we allocate quota for 1 unformatted node.
+ ** We test the offset because the tail might have been
+ ** split into multiple items, and we only want to decrement for
+ ** the unfm node once
+ */
+ if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(q_ih)) {
+ if ((le_ih_k_offset(q_ih) & (sb->s_blocksize - 1)) == 1) {
+ quota_cut_bytes = sb->s_blocksize + UNFM_P_SIZE;
+ } else {
+ quota_cut_bytes = 0;
+ }
+ }
+
+ if (un_bh) {
+ int off;
+ char *data;
+
+ /* We are in direct2indirect conversion, so move tail contents
+ to the unformatted node */
+ /* note, we do the copy before preparing the buffer because we
+ ** don't care about the contents of the unformatted node yet.
+ ** the only thing we really care about is the direct item's data
+ ** is in the unformatted node.
+ **
+ ** Otherwise, we would have to call reiserfs_prepare_for_journal on
+ ** the unformatted node, which might schedule, meaning we'd have to
+ ** loop all the way back up to the start of the while loop.
+ **
+ ** The unformatted node must be dirtied later on. We can't be
+ ** sure here if the entire tail has been deleted yet.
+ **
+ ** un_bh is from the page cache (all unformatted nodes are
+ ** from the page cache) and might be a highmem page. So, we
+ ** can't use un_bh->b_data.
+ ** -clm
+ */
+
+ data = kmap_atomic(un_bh->b_page);
+ off = ((le_ih_k_offset(&s_ih) - 1) & (PAGE_CACHE_SIZE - 1));
+ memcpy(data + off,
+ B_I_PITEM(PATH_PLAST_BUFFER(path), &s_ih),
+ ret_value);
+ kunmap_atomic(data);
+ }
+ /* Perform balancing after all resources have been collected at once. */
+ do_balance(&s_del_balance, NULL, NULL, M_DELETE);
+
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(sb, REISERFS_DEBUG_CODE,
+ "reiserquota delete_item(): freeing %u, id=%u type=%c",
+ quota_cut_bytes, inode->i_uid, head2type(&s_ih));
+#endif
+ dquot_free_space_nodirty(inode, quota_cut_bytes);
+
+ /* Return deleted body length */
+ return ret_value;
+}
+
+/* Summary Of Mechanisms For Handling Collisions Between Processes:
+
+ deletion of the body of the object is performed by iput(), with the
+ result that if multiple processes are operating on a file, the
+ deletion of the body of the file is deferred until the last process
+ that has an open inode performs its iput().
+
+ writes and truncates are protected from collisions by use of
+ semaphores.
+
+ creates, linking, and mknod are protected from collisions with other
+ processes by making the reiserfs_add_entry() the last step in the
+ creation, and then rolling back all changes if there was a collision.
+ - Hans
+*/
+
+/* this deletes item which never gets split */
+void reiserfs_delete_solid_item(struct reiserfs_transaction_handle *th,
+ struct inode *inode, struct reiserfs_key *key)
+{
+ struct tree_balance tb;
+ INITIALIZE_PATH(path);
+ int item_len = 0;
+ int tb_init = 0;
+ struct cpu_key cpu_key;
+ int retval;
+ int quota_cut_bytes = 0;
+
+ BUG_ON(!th->t_trans_id);
+
+ le_key2cpu_key(&cpu_key, key);
+
+ while (1) {
+ retval = search_item(th->t_super, &cpu_key, &path);
+ if (retval == IO_ERROR) {
+ reiserfs_error(th->t_super, "vs-5350",
+ "i/o failure occurred trying "
+ "to delete %K", &cpu_key);
+ break;
+ }
+ if (retval != ITEM_FOUND) {
+ pathrelse(&path);
+ // No need for a warning, if there is just no free space to insert '..' item into the newly-created subdir
+ if (!
+ ((unsigned long long)
+ GET_HASH_VALUE(le_key_k_offset
+ (le_key_version(key), key)) == 0
+ && (unsigned long long)
+ GET_GENERATION_NUMBER(le_key_k_offset
+ (le_key_version(key),
+ key)) == 1))
+ reiserfs_warning(th->t_super, "vs-5355",
+ "%k not found", key);
+ break;
+ }
+ if (!tb_init) {
+ tb_init = 1;
+ item_len = ih_item_len(PATH_PITEM_HEAD(&path));
+ init_tb_struct(th, &tb, th->t_super, &path,
+ -(IH_SIZE + item_len));
+ }
+ quota_cut_bytes = ih_item_len(PATH_PITEM_HEAD(&path));
+
+ retval = fix_nodes(M_DELETE, &tb, NULL, NULL);
+ if (retval == REPEAT_SEARCH) {
+ PROC_INFO_INC(th->t_super, delete_solid_item_restarted);
+ continue;
+ }
+
+ if (retval == CARRY_ON) {
+ do_balance(&tb, NULL, NULL, M_DELETE);
+ if (inode) { /* Should we count quota for item? (we don't count quotas for save-links) */
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
+ "reiserquota delete_solid_item(): freeing %u id=%u type=%c",
+ quota_cut_bytes, inode->i_uid,
+ key2type(key));
+#endif
+ dquot_free_space_nodirty(inode,
+ quota_cut_bytes);
+ }
+ break;
+ }
+ // IO_ERROR, NO_DISK_SPACE, etc
+ reiserfs_warning(th->t_super, "vs-5360",
+ "could not delete %K due to fix_nodes failure",
+ &cpu_key);
+ unfix_nodes(&tb);
+ break;
+ }
+
+ reiserfs_check_path(&path);
+}
+
+int reiserfs_delete_object(struct reiserfs_transaction_handle *th,
+ struct inode *inode)
+{
+ int err;
+ inode->i_size = 0;
+ BUG_ON(!th->t_trans_id);
+
+ /* for directory this deletes item containing "." and ".." */
+ err =
+ reiserfs_do_truncate(th, inode, NULL, 0 /*no timestamp updates */ );
+ if (err)
+ return err;
+
+#if defined( USE_INODE_GENERATION_COUNTER )
+ if (!old_format_only(th->t_super)) {
+ __le32 *inode_generation;
+
+ inode_generation =
+ &REISERFS_SB(th->t_super)->s_rs->s_inode_generation;
+ le32_add_cpu(inode_generation, 1);
+ }
+/* USE_INODE_GENERATION_COUNTER */
+#endif
+ reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode));
+
+ return err;
+}
+
+static void unmap_buffers(struct page *page, loff_t pos)
+{
+ struct buffer_head *bh;
+ struct buffer_head *head;
+ struct buffer_head *next;
+ unsigned long tail_index;
+ unsigned long cur_index;
+
+ if (page) {
+ if (page_has_buffers(page)) {
+ tail_index = pos & (PAGE_CACHE_SIZE - 1);
+ cur_index = 0;
+ head = page_buffers(page);
+ bh = head;
+ do {
+ next = bh->b_this_page;
+
+ /* we want to unmap the buffers that contain the tail, and
+ ** all the buffers after it (since the tail must be at the
+ ** end of the file). We don't want to unmap file data
+ ** before the tail, since it might be dirty and waiting to
+ ** reach disk
+ */
+ cur_index += bh->b_size;
+ if (cur_index > tail_index) {
+ reiserfs_unmap_buffer(bh);
+ }
+ bh = next;
+ } while (bh != head);
+ }
+ }
+}
+
+static int maybe_indirect_to_direct(struct reiserfs_transaction_handle *th,
+ struct inode *inode,
+ struct page *page,
+ struct treepath *path,
+ const struct cpu_key *item_key,
+ loff_t new_file_size, char *mode)
+{
+ struct super_block *sb = inode->i_sb;
+ int block_size = sb->s_blocksize;
+ int cut_bytes;
+ BUG_ON(!th->t_trans_id);
+ BUG_ON(new_file_size != inode->i_size);
+
+ /* the page being sent in could be NULL if there was an i/o error
+ ** reading in the last block. The user will hit problems trying to
+ ** read the file, but for now we just skip the indirect2direct
+ */
+ if (atomic_read(&inode->i_count) > 1 ||
+ !tail_has_to_be_packed(inode) ||
+ !page || (REISERFS_I(inode)->i_flags & i_nopack_mask)) {
+ /* leave tail in an unformatted node */
+ *mode = M_SKIP_BALANCING;
+ cut_bytes =
+ block_size - (new_file_size & (block_size - 1));
+ pathrelse(path);
+ return cut_bytes;
+ }
+ /* Perform the conversion to a direct_item. */
+ /* return indirect_to_direct(inode, path, item_key,
+ new_file_size, mode); */
+ return indirect2direct(th, inode, page, path, item_key,
+ new_file_size, mode);
+}
+
+/* we did indirect_to_direct conversion. And we have inserted direct
+ item successesfully, but there were no disk space to cut unfm
+ pointer being converted. Therefore we have to delete inserted
+ direct item(s) */
+static void indirect_to_direct_roll_back(struct reiserfs_transaction_handle *th,
+ struct inode *inode, struct treepath *path)
+{
+ struct cpu_key tail_key;
+ int tail_len;
+ int removed;
+ BUG_ON(!th->t_trans_id);
+
+ make_cpu_key(&tail_key, inode, inode->i_size + 1, TYPE_DIRECT, 4); // !!!!
+ tail_key.key_length = 4;
+
+ tail_len =
+ (cpu_key_k_offset(&tail_key) & (inode->i_sb->s_blocksize - 1)) - 1;
+ while (tail_len) {
+ /* look for the last byte of the tail */
+ if (search_for_position_by_key(inode->i_sb, &tail_key, path) ==
+ POSITION_NOT_FOUND)
+ reiserfs_panic(inode->i_sb, "vs-5615",
+ "found invalid item");
+ RFALSE(path->pos_in_item !=
+ ih_item_len(PATH_PITEM_HEAD(path)) - 1,
+ "vs-5616: appended bytes found");
+ PATH_LAST_POSITION(path)--;
+
+ removed =
+ reiserfs_delete_item(th, path, &tail_key, inode,
+ NULL /*unbh not needed */ );
+ RFALSE(removed <= 0
+ || removed > tail_len,
+ "vs-5617: there was tail %d bytes, removed item length %d bytes",
+ tail_len, removed);
+ tail_len -= removed;
+ set_cpu_key_k_offset(&tail_key,
+ cpu_key_k_offset(&tail_key) - removed);
+ }
+ reiserfs_warning(inode->i_sb, "reiserfs-5091", "indirect_to_direct "
+ "conversion has been rolled back due to "
+ "lack of disk space");
+ //mark_file_without_tail (inode);
+ mark_inode_dirty(inode);
+}
+
+/* (Truncate or cut entry) or delete object item. Returns < 0 on failure */
+int reiserfs_cut_from_item(struct reiserfs_transaction_handle *th,
+ struct treepath *path,
+ struct cpu_key *item_key,
+ struct inode *inode,
+ struct page *page, loff_t new_file_size)
+{
+ struct super_block *sb = inode->i_sb;
+ /* Every function which is going to call do_balance must first
+ create a tree_balance structure. Then it must fill up this
+ structure by using the init_tb_struct and fix_nodes functions.
+ After that we can make tree balancing. */
+ struct tree_balance s_cut_balance;
+ struct item_head *p_le_ih;
+ int cut_size = 0, /* Amount to be cut. */
+ ret_value = CARRY_ON, removed = 0, /* Number of the removed unformatted nodes. */
+ is_inode_locked = 0;
+ char mode; /* Mode of the balance. */
+ int retval2 = -1;
+ int quota_cut_bytes;
+ loff_t tail_pos = 0;
+
+ BUG_ON(!th->t_trans_id);
+
+ init_tb_struct(th, &s_cut_balance, inode->i_sb, path,
+ cut_size);
+
+ /* Repeat this loop until we either cut the item without needing
+ to balance, or we fix_nodes without schedule occurring */
+ while (1) {
+ /* Determine the balance mode, position of the first byte to
+ be cut, and size to be cut. In case of the indirect item
+ free unformatted nodes which are pointed to by the cut
+ pointers. */
+
+ mode =
+ prepare_for_delete_or_cut(th, inode, path,
+ item_key, &removed,
+ &cut_size, new_file_size);
+ if (mode == M_CONVERT) {
+ /* convert last unformatted node to direct item or leave
+ tail in the unformatted node */
+ RFALSE(ret_value != CARRY_ON,
+ "PAP-5570: can not convert twice");
+
+ ret_value =
+ maybe_indirect_to_direct(th, inode, page,
+ path, item_key,
+ new_file_size, &mode);
+ if (mode == M_SKIP_BALANCING)
+ /* tail has been left in the unformatted node */
+ return ret_value;
+
+ is_inode_locked = 1;
+
+ /* removing of last unformatted node will change value we
+ have to return to truncate. Save it */
+ retval2 = ret_value;
+ /*retval2 = sb->s_blocksize - (new_file_size & (sb->s_blocksize - 1)); */
+
+ /* So, we have performed the first part of the conversion:
+ inserting the new direct item. Now we are removing the
+ last unformatted node pointer. Set key to search for
+ it. */
+ set_cpu_key_k_type(item_key, TYPE_INDIRECT);
+ item_key->key_length = 4;
+ new_file_size -=
+ (new_file_size & (sb->s_blocksize - 1));
+ tail_pos = new_file_size;
+ set_cpu_key_k_offset(item_key, new_file_size + 1);
+ if (search_for_position_by_key
+ (sb, item_key,
+ path) == POSITION_NOT_FOUND) {
+ print_block(PATH_PLAST_BUFFER(path), 3,
+ PATH_LAST_POSITION(path) - 1,
+ PATH_LAST_POSITION(path) + 1);
+ reiserfs_panic(sb, "PAP-5580", "item to "
+ "convert does not exist (%K)",
+ item_key);
+ }
+ continue;
+ }
+ if (cut_size == 0) {
+ pathrelse(path);
+ return 0;
+ }
+
+ s_cut_balance.insert_size[0] = cut_size;
+
+ ret_value = fix_nodes(mode, &s_cut_balance, NULL, NULL);
+ if (ret_value != REPEAT_SEARCH)
+ break;
+
+ PROC_INFO_INC(sb, cut_from_item_restarted);
+
+ ret_value =
+ search_for_position_by_key(sb, item_key, path);
+ if (ret_value == POSITION_FOUND)
+ continue;
+
+ reiserfs_warning(sb, "PAP-5610", "item %K not found",
+ item_key);
+ unfix_nodes(&s_cut_balance);
+ return (ret_value == IO_ERROR) ? -EIO : -ENOENT;
+ } /* while */
+
+ // check fix_nodes results (IO_ERROR or NO_DISK_SPACE)
+ if (ret_value != CARRY_ON) {
+ if (is_inode_locked) {
+ // FIXME: this seems to be not needed: we are always able
+ // to cut item
+ indirect_to_direct_roll_back(th, inode, path);
+ }
+ if (ret_value == NO_DISK_SPACE)
+ reiserfs_warning(sb, "reiserfs-5092",
+ "NO_DISK_SPACE");
+ unfix_nodes(&s_cut_balance);
+ return -EIO;
+ }
+
+ /* go ahead and perform balancing */
+
+ RFALSE(mode == M_PASTE || mode == M_INSERT, "invalid mode");
+
+ /* Calculate number of bytes that need to be cut from the item. */
+ quota_cut_bytes =
+ (mode ==
+ M_DELETE) ? ih_item_len(get_ih(path)) : -s_cut_balance.
+ insert_size[0];
+ if (retval2 == -1)
+ ret_value = calc_deleted_bytes_number(&s_cut_balance, mode);
+ else
+ ret_value = retval2;
+
+ /* For direct items, we only change the quota when deleting the last
+ ** item.
+ */
+ p_le_ih = PATH_PITEM_HEAD(s_cut_balance.tb_path);
+ if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(p_le_ih)) {
+ if (mode == M_DELETE &&
+ (le_ih_k_offset(p_le_ih) & (sb->s_blocksize - 1)) ==
+ 1) {
+ // FIXME: this is to keep 3.5 happy
+ REISERFS_I(inode)->i_first_direct_byte = U32_MAX;
+ quota_cut_bytes = sb->s_blocksize + UNFM_P_SIZE;
+ } else {
+ quota_cut_bytes = 0;
+ }
+ }
+#ifdef CONFIG_REISERFS_CHECK
+ if (is_inode_locked) {
+ struct item_head *le_ih =
+ PATH_PITEM_HEAD(s_cut_balance.tb_path);
+ /* we are going to complete indirect2direct conversion. Make
+ sure, that we exactly remove last unformatted node pointer
+ of the item */
+ if (!is_indirect_le_ih(le_ih))
+ reiserfs_panic(sb, "vs-5652",
+ "item must be indirect %h", le_ih);
+
+ if (mode == M_DELETE && ih_item_len(le_ih) != UNFM_P_SIZE)
+ reiserfs_panic(sb, "vs-5653", "completing "
+ "indirect2direct conversion indirect "
+ "item %h being deleted must be of "
+ "4 byte long", le_ih);
+
+ if (mode == M_CUT
+ && s_cut_balance.insert_size[0] != -UNFM_P_SIZE) {
+ reiserfs_panic(sb, "vs-5654", "can not complete "
+ "indirect2direct conversion of %h "
+ "(CUT, insert_size==%d)",
+ le_ih, s_cut_balance.insert_size[0]);
+ }
+ /* it would be useful to make sure, that right neighboring
+ item is direct item of this file */
+ }
+#endif
+
+ do_balance(&s_cut_balance, NULL, NULL, mode);
+ if (is_inode_locked) {
+ /* we've done an indirect->direct conversion. when the data block
+ ** was freed, it was removed from the list of blocks that must
+ ** be flushed before the transaction commits, make sure to
+ ** unmap and invalidate it
+ */
+ unmap_buffers(page, tail_pos);
+ REISERFS_I(inode)->i_flags &= ~i_pack_on_close_mask;
+ }
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
+ "reiserquota cut_from_item(): freeing %u id=%u type=%c",
+ quota_cut_bytes, inode->i_uid, '?');
+#endif
+ dquot_free_space_nodirty(inode, quota_cut_bytes);
+ return ret_value;
+}
+
+static void truncate_directory(struct reiserfs_transaction_handle *th,
+ struct inode *inode)
+{
+ BUG_ON(!th->t_trans_id);
+ if (inode->i_nlink)
+ reiserfs_error(inode->i_sb, "vs-5655", "link count != 0");
+
+ set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), DOT_OFFSET);
+ set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_DIRENTRY);
+ reiserfs_delete_solid_item(th, inode, INODE_PKEY(inode));
+ reiserfs_update_sd(th, inode);
+ set_le_key_k_offset(KEY_FORMAT_3_5, INODE_PKEY(inode), SD_OFFSET);
+ set_le_key_k_type(KEY_FORMAT_3_5, INODE_PKEY(inode), TYPE_STAT_DATA);
+}
+
+/* Truncate file to the new size. Note, this must be called with a transaction
+ already started */
+int reiserfs_do_truncate(struct reiserfs_transaction_handle *th,
+ struct inode *inode, /* ->i_size contains new size */
+ struct page *page, /* up to date for last block */
+ int update_timestamps /* when it is called by
+ file_release to convert
+ the tail - no timestamps
+ should be updated */
+ )
+{
+ INITIALIZE_PATH(s_search_path); /* Path to the current object item. */
+ struct item_head *p_le_ih; /* Pointer to an item header. */
+ struct cpu_key s_item_key; /* Key to search for a previous file item. */
+ loff_t file_size, /* Old file size. */
+ new_file_size; /* New file size. */
+ int deleted; /* Number of deleted or truncated bytes. */
+ int retval;
+ int err = 0;
+
+ BUG_ON(!th->t_trans_id);
+ if (!
+ (S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
+ || S_ISLNK(inode->i_mode)))
+ return 0;
+
+ if (S_ISDIR(inode->i_mode)) {
+ // deletion of directory - no need to update timestamps
+ truncate_directory(th, inode);
+ return 0;
+ }
+
+ /* Get new file size. */
+ new_file_size = inode->i_size;
+
+ // FIXME: note, that key type is unimportant here
+ make_cpu_key(&s_item_key, inode, max_reiserfs_offset(inode),
+ TYPE_DIRECT, 3);
+
+ retval =
+ search_for_position_by_key(inode->i_sb, &s_item_key,
+ &s_search_path);
+ if (retval == IO_ERROR) {
+ reiserfs_error(inode->i_sb, "vs-5657",
+ "i/o failure occurred trying to truncate %K",
+ &s_item_key);
+ err = -EIO;
+ goto out;
+ }
+ if (retval == POSITION_FOUND || retval == FILE_NOT_FOUND) {
+ reiserfs_error(inode->i_sb, "PAP-5660",
+ "wrong result %d of search for %K", retval,
+ &s_item_key);
+
+ err = -EIO;
+ goto out;
+ }
+
+ s_search_path.pos_in_item--;
+
+ /* Get real file size (total length of all file items) */
+ p_le_ih = PATH_PITEM_HEAD(&s_search_path);
+ if (is_statdata_le_ih(p_le_ih))
+ file_size = 0;
+ else {
+ loff_t offset = le_ih_k_offset(p_le_ih);
+ int bytes =
+ op_bytes_number(p_le_ih, inode->i_sb->s_blocksize);
+
+ /* this may mismatch with real file size: if last direct item
+ had no padding zeros and last unformatted node had no free
+ space, this file would have this file size */
+ file_size = offset + bytes - 1;
+ }
+ /*
+ * are we doing a full truncate or delete, if so
+ * kick in the reada code
+ */
+ if (new_file_size == 0)
+ s_search_path.reada = PATH_READA | PATH_READA_BACK;
+
+ if (file_size == 0 || file_size < new_file_size) {
+ goto update_and_out;
+ }
+
+ /* Update key to search for the last file item. */
+ set_cpu_key_k_offset(&s_item_key, file_size);
+
+ do {
+ /* Cut or delete file item. */
+ deleted =
+ reiserfs_cut_from_item(th, &s_search_path, &s_item_key,
+ inode, page, new_file_size);
+ if (deleted < 0) {
+ reiserfs_warning(inode->i_sb, "vs-5665",
+ "reiserfs_cut_from_item failed");
+ reiserfs_check_path(&s_search_path);
+ return 0;
+ }
+
+ RFALSE(deleted > file_size,
+ "PAP-5670: reiserfs_cut_from_item: too many bytes deleted: deleted %d, file_size %lu, item_key %K",
+ deleted, file_size, &s_item_key);
+
+ /* Change key to search the last file item. */
+ file_size -= deleted;
+
+ set_cpu_key_k_offset(&s_item_key, file_size);
+
+ /* While there are bytes to truncate and previous file item is presented in the tree. */
+
+ /*
+ ** This loop could take a really long time, and could log
+ ** many more blocks than a transaction can hold. So, we do a polite
+ ** journal end here, and if the transaction needs ending, we make
+ ** sure the file is consistent before ending the current trans
+ ** and starting a new one
+ */
+ if (journal_transaction_should_end(th, 0) ||
+ reiserfs_transaction_free_space(th) <= JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD) {
+ int orig_len_alloc = th->t_blocks_allocated;
+ pathrelse(&s_search_path);
+
+ if (update_timestamps) {
+ inode->i_mtime = CURRENT_TIME_SEC;
+ inode->i_ctime = CURRENT_TIME_SEC;
+ }
+ reiserfs_update_sd(th, inode);
+
+ err = journal_end(th, inode->i_sb, orig_len_alloc);
+ if (err)
+ goto out;
+ err = journal_begin(th, inode->i_sb,
+ JOURNAL_FOR_FREE_BLOCK_AND_UPDATE_SD + JOURNAL_PER_BALANCE_CNT * 4) ;
+ if (err)
+ goto out;
+ reiserfs_update_inode_transaction(inode);
+ }
+ } while (file_size > ROUND_UP(new_file_size) &&
+ search_for_position_by_key(inode->i_sb, &s_item_key,
+ &s_search_path) == POSITION_FOUND);
+
+ RFALSE(file_size > ROUND_UP(new_file_size),
+ "PAP-5680: truncate did not finish: new_file_size %Ld, current %Ld, oid %d",
+ new_file_size, file_size, s_item_key.on_disk_key.k_objectid);
+
+ update_and_out:
+ if (update_timestamps) {
+ // this is truncate, not file closing
+ inode->i_mtime = CURRENT_TIME_SEC;
+ inode->i_ctime = CURRENT_TIME_SEC;
+ }
+ reiserfs_update_sd(th, inode);
+
+ out:
+ pathrelse(&s_search_path);
+ return err;
+}
+
+#ifdef CONFIG_REISERFS_CHECK
+// this makes sure, that we __append__, not overwrite or add holes
+static void check_research_for_paste(struct treepath *path,
+ const struct cpu_key *key)
+{
+ struct item_head *found_ih = get_ih(path);
+
+ if (is_direct_le_ih(found_ih)) {
+ if (le_ih_k_offset(found_ih) +
+ op_bytes_number(found_ih,
+ get_last_bh(path)->b_size) !=
+ cpu_key_k_offset(key)
+ || op_bytes_number(found_ih,
+ get_last_bh(path)->b_size) !=
+ pos_in_item(path))
+ reiserfs_panic(NULL, "PAP-5720", "found direct item "
+ "%h or position (%d) does not match "
+ "to key %K", found_ih,
+ pos_in_item(path), key);
+ }
+ if (is_indirect_le_ih(found_ih)) {
+ if (le_ih_k_offset(found_ih) +
+ op_bytes_number(found_ih,
+ get_last_bh(path)->b_size) !=
+ cpu_key_k_offset(key)
+ || I_UNFM_NUM(found_ih) != pos_in_item(path)
+ || get_ih_free_space(found_ih) != 0)
+ reiserfs_panic(NULL, "PAP-5730", "found indirect "
+ "item (%h) or position (%d) does not "
+ "match to key (%K)",
+ found_ih, pos_in_item(path), key);
+ }
+}
+#endif /* config reiserfs check */
+
+/* Paste bytes to the existing item. Returns bytes number pasted into the item. */
+int reiserfs_paste_into_item(struct reiserfs_transaction_handle *th, struct treepath *search_path, /* Path to the pasted item. */
+ const struct cpu_key *key, /* Key to search for the needed item. */
+ struct inode *inode, /* Inode item belongs to */
+ const char *body, /* Pointer to the bytes to paste. */
+ int pasted_size)
+{ /* Size of pasted bytes. */
+ struct tree_balance s_paste_balance;
+ int retval;
+ int fs_gen;
+
+ BUG_ON(!th->t_trans_id);
+
+ fs_gen = get_generation(inode->i_sb);
+
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
+ "reiserquota paste_into_item(): allocating %u id=%u type=%c",
+ pasted_size, inode->i_uid,
+ key2type(&(key->on_disk_key)));
+#endif
+
+ reiserfs_write_unlock(inode->i_sb);
+ retval = dquot_alloc_space_nodirty(inode, pasted_size);
+ reiserfs_write_lock(inode->i_sb);
+ if (retval) {
+ pathrelse(search_path);
+ return retval;
+ }
+ init_tb_struct(th, &s_paste_balance, th->t_super, search_path,
+ pasted_size);
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ s_paste_balance.key = key->on_disk_key;
+#endif
+
+ /* DQUOT_* can schedule, must check before the fix_nodes */
+ if (fs_changed(fs_gen, inode->i_sb)) {
+ goto search_again;
+ }
+
+ while ((retval =
+ fix_nodes(M_PASTE, &s_paste_balance, NULL,
+ body)) == REPEAT_SEARCH) {
+ search_again:
+ /* file system changed while we were in the fix_nodes */
+ PROC_INFO_INC(th->t_super, paste_into_item_restarted);
+ retval =
+ search_for_position_by_key(th->t_super, key,
+ search_path);
+ if (retval == IO_ERROR) {
+ retval = -EIO;
+ goto error_out;
+ }
+ if (retval == POSITION_FOUND) {
+ reiserfs_warning(inode->i_sb, "PAP-5710",
+ "entry or pasted byte (%K) exists",
+ key);
+ retval = -EEXIST;
+ goto error_out;
+ }
+#ifdef CONFIG_REISERFS_CHECK
+ check_research_for_paste(search_path, key);
+#endif
+ }
+
+ /* Perform balancing after all resources are collected by fix_nodes, and
+ accessing them will not risk triggering schedule. */
+ if (retval == CARRY_ON) {
+ do_balance(&s_paste_balance, NULL /*ih */ , body, M_PASTE);
+ return 0;
+ }
+ retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO;
+ error_out:
+ /* this also releases the path */
+ unfix_nodes(&s_paste_balance);
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
+ "reiserquota paste_into_item(): freeing %u id=%u type=%c",
+ pasted_size, inode->i_uid,
+ key2type(&(key->on_disk_key)));
+#endif
+ dquot_free_space_nodirty(inode, pasted_size);
+ return retval;
+}
+
+/* Insert new item into the buffer at the path.
+ * th - active transaction handle
+ * path - path to the inserted item
+ * ih - pointer to the item header to insert
+ * body - pointer to the bytes to insert
+ */
+int reiserfs_insert_item(struct reiserfs_transaction_handle *th,
+ struct treepath *path, const struct cpu_key *key,
+ struct item_head *ih, struct inode *inode,
+ const char *body)
+{
+ struct tree_balance s_ins_balance;
+ int retval;
+ int fs_gen = 0;
+ int quota_bytes = 0;
+
+ BUG_ON(!th->t_trans_id);
+
+ if (inode) { /* Do we count quotas for item? */
+ fs_gen = get_generation(inode->i_sb);
+ quota_bytes = ih_item_len(ih);
+
+ /* hack so the quota code doesn't have to guess if the file has
+ ** a tail, links are always tails, so there's no guessing needed
+ */
+ if (!S_ISLNK(inode->i_mode) && is_direct_le_ih(ih))
+ quota_bytes = inode->i_sb->s_blocksize + UNFM_P_SIZE;
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(inode->i_sb, REISERFS_DEBUG_CODE,
+ "reiserquota insert_item(): allocating %u id=%u type=%c",
+ quota_bytes, inode->i_uid, head2type(ih));
+#endif
+ reiserfs_write_unlock(inode->i_sb);
+ /* We can't dirty inode here. It would be immediately written but
+ * appropriate stat item isn't inserted yet... */
+ retval = dquot_alloc_space_nodirty(inode, quota_bytes);
+ reiserfs_write_lock(inode->i_sb);
+ if (retval) {
+ pathrelse(path);
+ return retval;
+ }
+ }
+ init_tb_struct(th, &s_ins_balance, th->t_super, path,
+ IH_SIZE + ih_item_len(ih));
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ s_ins_balance.key = key->on_disk_key;
+#endif
+ /* DQUOT_* can schedule, must check to be sure calling fix_nodes is safe */
+ if (inode && fs_changed(fs_gen, inode->i_sb)) {
+ goto search_again;
+ }
+
+ while ((retval =
+ fix_nodes(M_INSERT, &s_ins_balance, ih,
+ body)) == REPEAT_SEARCH) {
+ search_again:
+ /* file system changed while we were in the fix_nodes */
+ PROC_INFO_INC(th->t_super, insert_item_restarted);
+ retval = search_item(th->t_super, key, path);
+ if (retval == IO_ERROR) {
+ retval = -EIO;
+ goto error_out;
+ }
+ if (retval == ITEM_FOUND) {
+ reiserfs_warning(th->t_super, "PAP-5760",
+ "key %K already exists in the tree",
+ key);
+ retval = -EEXIST;
+ goto error_out;
+ }
+ }
+
+ /* make balancing after all resources will be collected at a time */
+ if (retval == CARRY_ON) {
+ do_balance(&s_ins_balance, ih, body, M_INSERT);
+ return 0;
+ }
+
+ retval = (retval == NO_DISK_SPACE) ? -ENOSPC : -EIO;
+ error_out:
+ /* also releases the path */
+ unfix_nodes(&s_ins_balance);
+#ifdef REISERQUOTA_DEBUG
+ reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
+ "reiserquota insert_item(): freeing %u id=%u type=%c",
+ quota_bytes, inode->i_uid, head2type(ih));
+#endif
+ if (inode)
+ dquot_free_space_nodirty(inode, quota_bytes);
+ return retval;
+}