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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/reiserfs/item_ops.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/reiserfs/item_ops.c')
-rw-r--r-- | fs/reiserfs/item_ops.c | 788 |
1 files changed, 788 insertions, 0 deletions
diff --git a/fs/reiserfs/item_ops.c b/fs/reiserfs/item_ops.c new file mode 100644 index 0000000..9cf7c13 --- /dev/null +++ b/fs/reiserfs/item_ops.c @@ -0,0 +1,788 @@ +/* + * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README + */ + +#include <linux/time.h> +#include <linux/reiserfs_fs.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)(-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 | %6Lu | %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) +{ + // FIXME: type something here! +} + + +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; + //vi->vi_type |= VI_TYPE_STAT_DATA;// not needed? + return 0; +} + + +static int sd_check_left (struct virtual_item * vi, int free, + int start_skip, int end_skip) +{ + if (start_skip || end_skip) + BUG (); + 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) +{ + if (count) + BUG (); + 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, "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) +{ + // FIXME: type something here! +} + + +static int direct_create_vi (struct virtual_node * vn, + struct virtual_item * vi, + int is_affected, + int insert_size) +{ + vi->vi_index = TYPE_DIRECT; + //vi->vi_type |= VI_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, "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; //- get_ih_free_space (ih); +} + + +// 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; + __u32 * unp, prev = INT_MAX; + int num; + + unp = (__u32 *)item; + + if (ih_item_len(ih) % UNFM_P_SIZE) + reiserfs_warning (NULL, "indirect_print_item: 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) +{ + // FIXME: type something here! +} + + +static int indirect_create_vi (struct virtual_node * vn, + struct virtual_item * vi, + int is_affected, + int insert_size) +{ + vi->vi_index = TYPE_INDIRECT; + //vi->vi_type |= VI_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, "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: direntry_bytes_number: " + "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 < I_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%-15Ld%-15Ld(%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; + + // FIXME: type something here! + deh = (struct reiserfs_de_head *)item; + for (i = 0; i < I_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; + + if (!(vi->vi_ih) || !vi->vi_item) + BUG (); + + + 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: set_entry_sizes: (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 ++) { + if (dir_u->entry_sizes[i] > free) + /* i-th entry doesn't fit into the remaining free space */ + break; + + free -= dir_u->entry_sizes[i]; + entries ++; + } + + if (entries == dir_u->entry_count) { + reiserfs_panic (NULL, "free space %d, entry_count %d\n", 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 --) { + if (dir_u->entry_sizes[i] > free) + /* i-th entry doesn't fit into the remaining free space */ + break; + + free -= dir_u->entry_sizes[i]; + entries ++; + } + if (entries == dir_u->entry_count) + BUG (); + + /* "." 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, "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"); + return 0; // 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. +} + +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) + do not compile +#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) */ +}; + + + + |