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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/reiserfs/item_ops.c
Initial import
Diffstat (limited to 'fs/reiserfs/item_ops.c')
-rw-r--r--fs/reiserfs/item_ops.c752
1 files changed, 752 insertions, 0 deletions
diff --git a/fs/reiserfs/item_ops.c b/fs/reiserfs/item_ops.c
new file mode 100644
index 000000000..aca73dd73
--- /dev/null
+++ b/fs/reiserfs/item_ops.c
@@ -0,0 +1,752 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/time.h>
+#include "reiserfs.h"
+
+/*
+ * this contains item handlers for old item types: sd, direct,
+ * indirect, directory
+ */
+
+/*
+ * and where are the comments? how about saying where we can find an
+ * explanation of each item handler method? -Hans
+ */
+
+/* stat data functions */
+static int sd_bytes_number(struct item_head *ih, int block_size)
+{
+ return 0;
+}
+
+static void sd_decrement_key(struct cpu_key *key)
+{
+ key->on_disk_key.k_objectid--;
+ set_cpu_key_k_type(key, TYPE_ANY);
+ set_cpu_key_k_offset(key, (loff_t)(~0ULL >> 1));
+}
+
+static int sd_is_left_mergeable(struct reiserfs_key *key, unsigned long bsize)
+{
+ return 0;
+}
+
+static char *print_time(time_t t)
+{
+ static char timebuf[256];
+
+ sprintf(timebuf, "%ld", t);
+ return timebuf;
+}
+
+static void sd_print_item(struct item_head *ih, char *item)
+{
+ printk("\tmode | size | nlinks | first direct | mtime\n");
+ if (stat_data_v1(ih)) {
+ struct stat_data_v1 *sd = (struct stat_data_v1 *)item;
+
+ printk("\t0%-6o | %6u | %2u | %d | %s\n", sd_v1_mode(sd),
+ sd_v1_size(sd), sd_v1_nlink(sd),
+ sd_v1_first_direct_byte(sd),
+ print_time(sd_v1_mtime(sd)));
+ } else {
+ struct stat_data *sd = (struct stat_data *)item;
+
+ printk("\t0%-6o | %6llu | %2u | %d | %s\n", sd_v2_mode(sd),
+ (unsigned long long)sd_v2_size(sd), sd_v2_nlink(sd),
+ sd_v2_rdev(sd), print_time(sd_v2_mtime(sd)));
+ }
+}
+
+static void sd_check_item(struct item_head *ih, char *item)
+{
+ /* unused */
+}
+
+static int sd_create_vi(struct virtual_node *vn,
+ struct virtual_item *vi,
+ int is_affected, int insert_size)
+{
+ vi->vi_index = TYPE_STAT_DATA;
+ return 0;
+}
+
+static int sd_check_left(struct virtual_item *vi, int free,
+ int start_skip, int end_skip)
+{
+ BUG_ON(start_skip || end_skip);
+ return -1;
+}
+
+static int sd_check_right(struct virtual_item *vi, int free)
+{
+ return -1;
+}
+
+static int sd_part_size(struct virtual_item *vi, int first, int count)
+{
+ BUG_ON(count);
+ return 0;
+}
+
+static int sd_unit_num(struct virtual_item *vi)
+{
+ return vi->vi_item_len - IH_SIZE;
+}
+
+static void sd_print_vi(struct virtual_item *vi)
+{
+ reiserfs_warning(NULL, "reiserfs-16100",
+ "STATDATA, index %d, type 0x%x, %h",
+ vi->vi_index, vi->vi_type, vi->vi_ih);
+}
+
+static struct item_operations stat_data_ops = {
+ .bytes_number = sd_bytes_number,
+ .decrement_key = sd_decrement_key,
+ .is_left_mergeable = sd_is_left_mergeable,
+ .print_item = sd_print_item,
+ .check_item = sd_check_item,
+
+ .create_vi = sd_create_vi,
+ .check_left = sd_check_left,
+ .check_right = sd_check_right,
+ .part_size = sd_part_size,
+ .unit_num = sd_unit_num,
+ .print_vi = sd_print_vi
+};
+
+/* direct item functions */
+static int direct_bytes_number(struct item_head *ih, int block_size)
+{
+ return ih_item_len(ih);
+}
+
+/* FIXME: this should probably switch to indirect as well */
+static void direct_decrement_key(struct cpu_key *key)
+{
+ cpu_key_k_offset_dec(key);
+ if (cpu_key_k_offset(key) == 0)
+ set_cpu_key_k_type(key, TYPE_STAT_DATA);
+}
+
+static int direct_is_left_mergeable(struct reiserfs_key *key,
+ unsigned long bsize)
+{
+ int version = le_key_version(key);
+ return ((le_key_k_offset(version, key) & (bsize - 1)) != 1);
+}
+
+static void direct_print_item(struct item_head *ih, char *item)
+{
+ int j = 0;
+
+/* return; */
+ printk("\"");
+ while (j < ih_item_len(ih))
+ printk("%c", item[j++]);
+ printk("\"\n");
+}
+
+static void direct_check_item(struct item_head *ih, char *item)
+{
+ /* unused */
+}
+
+static int direct_create_vi(struct virtual_node *vn,
+ struct virtual_item *vi,
+ int is_affected, int insert_size)
+{
+ vi->vi_index = TYPE_DIRECT;
+ return 0;
+}
+
+static int direct_check_left(struct virtual_item *vi, int free,
+ int start_skip, int end_skip)
+{
+ int bytes;
+
+ bytes = free - free % 8;
+ return bytes ? : -1;
+}
+
+static int direct_check_right(struct virtual_item *vi, int free)
+{
+ return direct_check_left(vi, free, 0, 0);
+}
+
+static int direct_part_size(struct virtual_item *vi, int first, int count)
+{
+ return count;
+}
+
+static int direct_unit_num(struct virtual_item *vi)
+{
+ return vi->vi_item_len - IH_SIZE;
+}
+
+static void direct_print_vi(struct virtual_item *vi)
+{
+ reiserfs_warning(NULL, "reiserfs-16101",
+ "DIRECT, index %d, type 0x%x, %h",
+ vi->vi_index, vi->vi_type, vi->vi_ih);
+}
+
+static struct item_operations direct_ops = {
+ .bytes_number = direct_bytes_number,
+ .decrement_key = direct_decrement_key,
+ .is_left_mergeable = direct_is_left_mergeable,
+ .print_item = direct_print_item,
+ .check_item = direct_check_item,
+
+ .create_vi = direct_create_vi,
+ .check_left = direct_check_left,
+ .check_right = direct_check_right,
+ .part_size = direct_part_size,
+ .unit_num = direct_unit_num,
+ .print_vi = direct_print_vi
+};
+
+/* indirect item functions */
+static int indirect_bytes_number(struct item_head *ih, int block_size)
+{
+ return ih_item_len(ih) / UNFM_P_SIZE * block_size;
+}
+
+/* decrease offset, if it becomes 0, change type to stat data */
+static void indirect_decrement_key(struct cpu_key *key)
+{
+ cpu_key_k_offset_dec(key);
+ if (cpu_key_k_offset(key) == 0)
+ set_cpu_key_k_type(key, TYPE_STAT_DATA);
+}
+
+/* if it is not first item of the body, then it is mergeable */
+static int indirect_is_left_mergeable(struct reiserfs_key *key,
+ unsigned long bsize)
+{
+ int version = le_key_version(key);
+ return (le_key_k_offset(version, key) != 1);
+}
+
+/* printing of indirect item */
+static void start_new_sequence(__u32 * start, int *len, __u32 new)
+{
+ *start = new;
+ *len = 1;
+}
+
+static int sequence_finished(__u32 start, int *len, __u32 new)
+{
+ if (start == INT_MAX)
+ return 1;
+
+ if (start == 0 && new == 0) {
+ (*len)++;
+ return 0;
+ }
+ if (start != 0 && (start + *len) == new) {
+ (*len)++;
+ return 0;
+ }
+ return 1;
+}
+
+static void print_sequence(__u32 start, int len)
+{
+ if (start == INT_MAX)
+ return;
+
+ if (len == 1)
+ printk(" %d", start);
+ else
+ printk(" %d(%d)", start, len);
+}
+
+static void indirect_print_item(struct item_head *ih, char *item)
+{
+ int j;
+ __le32 *unp;
+ __u32 prev = INT_MAX;
+ int num = 0;
+
+ unp = (__le32 *) item;
+
+ if (ih_item_len(ih) % UNFM_P_SIZE)
+ reiserfs_warning(NULL, "reiserfs-16102", "invalid item len");
+
+ printk("%d pointers\n[ ", (int)I_UNFM_NUM(ih));
+ for (j = 0; j < I_UNFM_NUM(ih); j++) {
+ if (sequence_finished(prev, &num, get_block_num(unp, j))) {
+ print_sequence(prev, num);
+ start_new_sequence(&prev, &num, get_block_num(unp, j));
+ }
+ }
+ print_sequence(prev, num);
+ printk("]\n");
+}
+
+static void indirect_check_item(struct item_head *ih, char *item)
+{
+ /* unused */
+}
+
+static int indirect_create_vi(struct virtual_node *vn,
+ struct virtual_item *vi,
+ int is_affected, int insert_size)
+{
+ vi->vi_index = TYPE_INDIRECT;
+ return 0;
+}
+
+static int indirect_check_left(struct virtual_item *vi, int free,
+ int start_skip, int end_skip)
+{
+ int bytes;
+
+ bytes = free - free % UNFM_P_SIZE;
+ return bytes ? : -1;
+}
+
+static int indirect_check_right(struct virtual_item *vi, int free)
+{
+ return indirect_check_left(vi, free, 0, 0);
+}
+
+/*
+ * return size in bytes of 'units' units. If first == 0 - calculate
+ * from the head (left), otherwise - from tail (right)
+ */
+static int indirect_part_size(struct virtual_item *vi, int first, int units)
+{
+ /* unit of indirect item is byte (yet) */
+ return units;
+}
+
+static int indirect_unit_num(struct virtual_item *vi)
+{
+ /* unit of indirect item is byte (yet) */
+ return vi->vi_item_len - IH_SIZE;
+}
+
+static void indirect_print_vi(struct virtual_item *vi)
+{
+ reiserfs_warning(NULL, "reiserfs-16103",
+ "INDIRECT, index %d, type 0x%x, %h",
+ vi->vi_index, vi->vi_type, vi->vi_ih);
+}
+
+static struct item_operations indirect_ops = {
+ .bytes_number = indirect_bytes_number,
+ .decrement_key = indirect_decrement_key,
+ .is_left_mergeable = indirect_is_left_mergeable,
+ .print_item = indirect_print_item,
+ .check_item = indirect_check_item,
+
+ .create_vi = indirect_create_vi,
+ .check_left = indirect_check_left,
+ .check_right = indirect_check_right,
+ .part_size = indirect_part_size,
+ .unit_num = indirect_unit_num,
+ .print_vi = indirect_print_vi
+};
+
+/* direntry functions */
+static int direntry_bytes_number(struct item_head *ih, int block_size)
+{
+ reiserfs_warning(NULL, "vs-16090",
+ "bytes number is asked for direntry");
+ return 0;
+}
+
+static void direntry_decrement_key(struct cpu_key *key)
+{
+ cpu_key_k_offset_dec(key);
+ if (cpu_key_k_offset(key) == 0)
+ set_cpu_key_k_type(key, TYPE_STAT_DATA);
+}
+
+static int direntry_is_left_mergeable(struct reiserfs_key *key,
+ unsigned long bsize)
+{
+ if (le32_to_cpu(key->u.k_offset_v1.k_offset) == DOT_OFFSET)
+ return 0;
+ return 1;
+
+}
+
+static void direntry_print_item(struct item_head *ih, char *item)
+{
+ int i;
+ int namelen;
+ struct reiserfs_de_head *deh;
+ char *name;
+ static char namebuf[80];
+
+ printk("\n # %-15s%-30s%-15s%-15s%-15s\n", "Name",
+ "Key of pointed object", "Hash", "Gen number", "Status");
+
+ deh = (struct reiserfs_de_head *)item;
+
+ for (i = 0; i < ih_entry_count(ih); i++, deh++) {
+ namelen =
+ (i ? (deh_location(deh - 1)) : ih_item_len(ih)) -
+ deh_location(deh);
+ name = item + deh_location(deh);
+ if (name[namelen - 1] == 0)
+ namelen = strlen(name);
+ namebuf[0] = '"';
+ if (namelen > sizeof(namebuf) - 3) {
+ strncpy(namebuf + 1, name, sizeof(namebuf) - 3);
+ namebuf[sizeof(namebuf) - 2] = '"';
+ namebuf[sizeof(namebuf) - 1] = 0;
+ } else {
+ memcpy(namebuf + 1, name, namelen);
+ namebuf[namelen + 1] = '"';
+ namebuf[namelen + 2] = 0;
+ }
+
+ printk("%d: %-15s%-15d%-15d%-15lld%-15lld(%s)\n",
+ i, namebuf,
+ deh_dir_id(deh), deh_objectid(deh),
+ GET_HASH_VALUE(deh_offset(deh)),
+ GET_GENERATION_NUMBER((deh_offset(deh))),
+ (de_hidden(deh)) ? "HIDDEN" : "VISIBLE");
+ }
+}
+
+static void direntry_check_item(struct item_head *ih, char *item)
+{
+ int i;
+ struct reiserfs_de_head *deh;
+
+ /* unused */
+ deh = (struct reiserfs_de_head *)item;
+ for (i = 0; i < ih_entry_count(ih); i++, deh++) {
+ ;
+ }
+}
+
+#define DIRENTRY_VI_FIRST_DIRENTRY_ITEM 1
+
+/*
+ * function returns old entry number in directory item in real node
+ * using new entry number in virtual item in virtual node
+ */
+static inline int old_entry_num(int is_affected, int virtual_entry_num,
+ int pos_in_item, int mode)
+{
+ if (mode == M_INSERT || mode == M_DELETE)
+ return virtual_entry_num;
+
+ if (!is_affected)
+ /* cut or paste is applied to another item */
+ return virtual_entry_num;
+
+ if (virtual_entry_num < pos_in_item)
+ return virtual_entry_num;
+
+ if (mode == M_CUT)
+ return virtual_entry_num + 1;
+
+ RFALSE(mode != M_PASTE || virtual_entry_num == 0,
+ "vs-8015: old_entry_num: mode must be M_PASTE (mode = \'%c\'",
+ mode);
+
+ return virtual_entry_num - 1;
+}
+
+/*
+ * Create an array of sizes of directory entries for virtual
+ * item. Return space used by an item. FIXME: no control over
+ * consuming of space used by this item handler
+ */
+static int direntry_create_vi(struct virtual_node *vn,
+ struct virtual_item *vi,
+ int is_affected, int insert_size)
+{
+ struct direntry_uarea *dir_u = vi->vi_uarea;
+ int i, j;
+ int size = sizeof(struct direntry_uarea);
+ struct reiserfs_de_head *deh;
+
+ vi->vi_index = TYPE_DIRENTRY;
+
+ BUG_ON(!(vi->vi_ih) || !vi->vi_item);
+
+ dir_u->flags = 0;
+ if (le_ih_k_offset(vi->vi_ih) == DOT_OFFSET)
+ dir_u->flags |= DIRENTRY_VI_FIRST_DIRENTRY_ITEM;
+
+ deh = (struct reiserfs_de_head *)(vi->vi_item);
+
+ /* virtual directory item have this amount of entry after */
+ dir_u->entry_count = ih_entry_count(vi->vi_ih) +
+ ((is_affected) ? ((vn->vn_mode == M_CUT) ? -1 :
+ (vn->vn_mode == M_PASTE ? 1 : 0)) : 0);
+
+ for (i = 0; i < dir_u->entry_count; i++) {
+ j = old_entry_num(is_affected, i, vn->vn_pos_in_item,
+ vn->vn_mode);
+ dir_u->entry_sizes[i] =
+ (j ? deh_location(&deh[j - 1]) : ih_item_len(vi->vi_ih)) -
+ deh_location(&deh[j]) + DEH_SIZE;
+ }
+
+ size += (dir_u->entry_count * sizeof(short));
+
+ /* set size of pasted entry */
+ if (is_affected && vn->vn_mode == M_PASTE)
+ dir_u->entry_sizes[vn->vn_pos_in_item] = insert_size;
+
+#ifdef CONFIG_REISERFS_CHECK
+ /* compare total size of entries with item length */
+ {
+ int k, l;
+
+ l = 0;
+ for (k = 0; k < dir_u->entry_count; k++)
+ l += dir_u->entry_sizes[k];
+
+ if (l + IH_SIZE != vi->vi_item_len +
+ ((is_affected
+ && (vn->vn_mode == M_PASTE
+ || vn->vn_mode == M_CUT)) ? insert_size : 0)) {
+ reiserfs_panic(NULL, "vs-8025", "(mode==%c, "
+ "insert_size==%d), invalid length of "
+ "directory item",
+ vn->vn_mode, insert_size);
+ }
+ }
+#endif
+
+ return size;
+
+}
+
+/*
+ * return number of entries which may fit into specified amount of
+ * free space, or -1 if free space is not enough even for 1 entry
+ */
+static int direntry_check_left(struct virtual_item *vi, int free,
+ int start_skip, int end_skip)
+{
+ int i;
+ int entries = 0;
+ struct direntry_uarea *dir_u = vi->vi_uarea;
+
+ for (i = start_skip; i < dir_u->entry_count - end_skip; i++) {
+ /* i-th entry doesn't fit into the remaining free space */
+ if (dir_u->entry_sizes[i] > free)
+ break;
+
+ free -= dir_u->entry_sizes[i];
+ entries++;
+ }
+
+ if (entries == dir_u->entry_count) {
+ reiserfs_panic(NULL, "item_ops-1",
+ "free space %d, entry_count %d", free,
+ dir_u->entry_count);
+ }
+
+ /* "." and ".." can not be separated from each other */
+ if (start_skip == 0 && (dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM)
+ && entries < 2)
+ entries = 0;
+
+ return entries ? : -1;
+}
+
+static int direntry_check_right(struct virtual_item *vi, int free)
+{
+ int i;
+ int entries = 0;
+ struct direntry_uarea *dir_u = vi->vi_uarea;
+
+ for (i = dir_u->entry_count - 1; i >= 0; i--) {
+ /* i-th entry doesn't fit into the remaining free space */
+ if (dir_u->entry_sizes[i] > free)
+ break;
+
+ free -= dir_u->entry_sizes[i];
+ entries++;
+ }
+ BUG_ON(entries == dir_u->entry_count);
+
+ /* "." and ".." can not be separated from each other */
+ if ((dir_u->flags & DIRENTRY_VI_FIRST_DIRENTRY_ITEM)
+ && entries > dir_u->entry_count - 2)
+ entries = dir_u->entry_count - 2;
+
+ return entries ? : -1;
+}
+
+/* sum of entry sizes between from-th and to-th entries including both edges */
+static int direntry_part_size(struct virtual_item *vi, int first, int count)
+{
+ int i, retval;
+ int from, to;
+ struct direntry_uarea *dir_u = vi->vi_uarea;
+
+ retval = 0;
+ if (first == 0)
+ from = 0;
+ else
+ from = dir_u->entry_count - count;
+ to = from + count - 1;
+
+ for (i = from; i <= to; i++)
+ retval += dir_u->entry_sizes[i];
+
+ return retval;
+}
+
+static int direntry_unit_num(struct virtual_item *vi)
+{
+ struct direntry_uarea *dir_u = vi->vi_uarea;
+
+ return dir_u->entry_count;
+}
+
+static void direntry_print_vi(struct virtual_item *vi)
+{
+ int i;
+ struct direntry_uarea *dir_u = vi->vi_uarea;
+
+ reiserfs_warning(NULL, "reiserfs-16104",
+ "DIRENTRY, index %d, type 0x%x, %h, flags 0x%x",
+ vi->vi_index, vi->vi_type, vi->vi_ih, dir_u->flags);
+ printk("%d entries: ", dir_u->entry_count);
+ for (i = 0; i < dir_u->entry_count; i++)
+ printk("%d ", dir_u->entry_sizes[i]);
+ printk("\n");
+}
+
+static struct item_operations direntry_ops = {
+ .bytes_number = direntry_bytes_number,
+ .decrement_key = direntry_decrement_key,
+ .is_left_mergeable = direntry_is_left_mergeable,
+ .print_item = direntry_print_item,
+ .check_item = direntry_check_item,
+
+ .create_vi = direntry_create_vi,
+ .check_left = direntry_check_left,
+ .check_right = direntry_check_right,
+ .part_size = direntry_part_size,
+ .unit_num = direntry_unit_num,
+ .print_vi = direntry_print_vi
+};
+
+/* Error catching functions to catch errors caused by incorrect item types. */
+static int errcatch_bytes_number(struct item_head *ih, int block_size)
+{
+ reiserfs_warning(NULL, "green-16001",
+ "Invalid item type observed, run fsck ASAP");
+ return 0;
+}
+
+static void errcatch_decrement_key(struct cpu_key *key)
+{
+ reiserfs_warning(NULL, "green-16002",
+ "Invalid item type observed, run fsck ASAP");
+}
+
+static int errcatch_is_left_mergeable(struct reiserfs_key *key,
+ unsigned long bsize)
+{
+ reiserfs_warning(NULL, "green-16003",
+ "Invalid item type observed, run fsck ASAP");
+ return 0;
+}
+
+static void errcatch_print_item(struct item_head *ih, char *item)
+{
+ reiserfs_warning(NULL, "green-16004",
+ "Invalid item type observed, run fsck ASAP");
+}
+
+static void errcatch_check_item(struct item_head *ih, char *item)
+{
+ reiserfs_warning(NULL, "green-16005",
+ "Invalid item type observed, run fsck ASAP");
+}
+
+static int errcatch_create_vi(struct virtual_node *vn,
+ struct virtual_item *vi,
+ int is_affected, int insert_size)
+{
+ reiserfs_warning(NULL, "green-16006",
+ "Invalid item type observed, run fsck ASAP");
+ /*
+ * We might return -1 here as well, but it won't help as
+ * create_virtual_node() from where this operation is called
+ * from is of return type void.
+ */
+ return 0;
+}
+
+static int errcatch_check_left(struct virtual_item *vi, int free,
+ int start_skip, int end_skip)
+{
+ reiserfs_warning(NULL, "green-16007",
+ "Invalid item type observed, run fsck ASAP");
+ return -1;
+}
+
+static int errcatch_check_right(struct virtual_item *vi, int free)
+{
+ reiserfs_warning(NULL, "green-16008",
+ "Invalid item type observed, run fsck ASAP");
+ return -1;
+}
+
+static int errcatch_part_size(struct virtual_item *vi, int first, int count)
+{
+ reiserfs_warning(NULL, "green-16009",
+ "Invalid item type observed, run fsck ASAP");
+ return 0;
+}
+
+static int errcatch_unit_num(struct virtual_item *vi)
+{
+ reiserfs_warning(NULL, "green-16010",
+ "Invalid item type observed, run fsck ASAP");
+ return 0;
+}
+
+static void errcatch_print_vi(struct virtual_item *vi)
+{
+ reiserfs_warning(NULL, "green-16011",
+ "Invalid item type observed, run fsck ASAP");
+}
+
+static struct item_operations errcatch_ops = {
+ errcatch_bytes_number,
+ errcatch_decrement_key,
+ errcatch_is_left_mergeable,
+ errcatch_print_item,
+ errcatch_check_item,
+
+ errcatch_create_vi,
+ errcatch_check_left,
+ errcatch_check_right,
+ errcatch_part_size,
+ errcatch_unit_num,
+ errcatch_print_vi
+};
+
+#if ! (TYPE_STAT_DATA == 0 && TYPE_INDIRECT == 1 && TYPE_DIRECT == 2 && TYPE_DIRENTRY == 3)
+#error Item types must use disk-format assigned values.
+#endif
+
+struct item_operations *item_ops[TYPE_ANY + 1] = {
+ &stat_data_ops,
+ &indirect_ops,
+ &direct_ops,
+ &direntry_ops,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+ &errcatch_ops /* This is to catch errors with invalid type (15th entry for TYPE_ANY) */
+};