1693 lines
44 KiB
C
1693 lines
44 KiB
C
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/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*
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* Trivial changes by Alan Cox to remove EHASHCOLLISION for compatibility
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*
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* Trivial Changes:
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* Rights granted to Hans Reiser to redistribute under other terms providing
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* he accepts all liability including but not limited to patent, fitness
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* for purpose, and direct or indirect claims arising from failure to perform.
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*
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* NO WARRANTY
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*/
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#include <linux/time.h>
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#include <linux/bitops.h>
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#include <linux/slab.h>
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#include "reiserfs.h"
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#include "acl.h"
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#include "xattr.h"
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#include <linux/quotaops.h>
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#define INC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) { inc_nlink(i); if (i->i_nlink >= REISERFS_LINK_MAX) set_nlink(i, 1); }
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#define DEC_DIR_INODE_NLINK(i) if (i->i_nlink != 1) drop_nlink(i);
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/*
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* directory item contains array of entry headers. This performs
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* binary search through that array
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*/
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static int bin_search_in_dir_item(struct reiserfs_dir_entry *de, loff_t off)
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{
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struct item_head *ih = de->de_ih;
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struct reiserfs_de_head *deh = de->de_deh;
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int rbound, lbound, j;
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lbound = 0;
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rbound = ih_entry_count(ih) - 1;
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for (j = (rbound + lbound) / 2; lbound <= rbound;
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j = (rbound + lbound) / 2) {
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if (off < deh_offset(deh + j)) {
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rbound = j - 1;
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continue;
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}
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if (off > deh_offset(deh + j)) {
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lbound = j + 1;
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continue;
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}
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/* this is not name found, but matched third key component */
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de->de_entry_num = j;
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return NAME_FOUND;
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}
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de->de_entry_num = lbound;
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return NAME_NOT_FOUND;
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}
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/*
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* comment? maybe something like set de to point to what the path points to?
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*/
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static inline void set_de_item_location(struct reiserfs_dir_entry *de,
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struct treepath *path)
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{
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de->de_bh = get_last_bh(path);
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de->de_ih = tp_item_head(path);
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de->de_deh = B_I_DEH(de->de_bh, de->de_ih);
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de->de_item_num = PATH_LAST_POSITION(path);
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}
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/*
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* de_bh, de_ih, de_deh (points to first element of array), de_item_num is set
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*/
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inline void set_de_name_and_namelen(struct reiserfs_dir_entry *de)
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{
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struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num;
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BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
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de->de_entrylen = entry_length(de->de_bh, de->de_ih, de->de_entry_num);
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de->de_namelen = de->de_entrylen - (de_with_sd(deh) ? SD_SIZE : 0);
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de->de_name = ih_item_body(de->de_bh, de->de_ih) + deh_location(deh);
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if (de->de_name[de->de_namelen - 1] == 0)
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de->de_namelen = strlen(de->de_name);
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}
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/* what entry points to */
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static inline void set_de_object_key(struct reiserfs_dir_entry *de)
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{
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BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
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de->de_dir_id = deh_dir_id(&de->de_deh[de->de_entry_num]);
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de->de_objectid = deh_objectid(&de->de_deh[de->de_entry_num]);
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}
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static inline void store_de_entry_key(struct reiserfs_dir_entry *de)
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{
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struct reiserfs_de_head *deh = de->de_deh + de->de_entry_num;
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BUG_ON(de->de_entry_num >= ih_entry_count(de->de_ih));
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/* store key of the found entry */
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de->de_entry_key.version = KEY_FORMAT_3_5;
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de->de_entry_key.on_disk_key.k_dir_id =
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le32_to_cpu(de->de_ih->ih_key.k_dir_id);
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de->de_entry_key.on_disk_key.k_objectid =
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le32_to_cpu(de->de_ih->ih_key.k_objectid);
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set_cpu_key_k_offset(&de->de_entry_key, deh_offset(deh));
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set_cpu_key_k_type(&de->de_entry_key, TYPE_DIRENTRY);
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}
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/*
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* We assign a key to each directory item, and place multiple entries in a
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* single directory item. A directory item has a key equal to the key of
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* the first directory entry in it.
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* This function first calls search_by_key, then, if item whose first entry
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* matches is not found it looks for the entry inside directory item found
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* by search_by_key. Fills the path to the entry, and to the entry position
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* in the item
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*/
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/* The function is NOT SCHEDULE-SAFE! */
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int search_by_entry_key(struct super_block *sb, const struct cpu_key *key,
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struct treepath *path, struct reiserfs_dir_entry *de)
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{
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int retval;
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retval = search_item(sb, key, path);
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switch (retval) {
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case ITEM_NOT_FOUND:
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if (!PATH_LAST_POSITION(path)) {
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reiserfs_error(sb, "vs-7000", "search_by_key "
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"returned item position == 0");
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pathrelse(path);
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return IO_ERROR;
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}
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PATH_LAST_POSITION(path)--;
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break;
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case ITEM_FOUND:
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break;
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case IO_ERROR:
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return retval;
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default:
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pathrelse(path);
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reiserfs_error(sb, "vs-7002", "no path to here");
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return IO_ERROR;
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}
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set_de_item_location(de, path);
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#ifdef CONFIG_REISERFS_CHECK
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if (!is_direntry_le_ih(de->de_ih) ||
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COMP_SHORT_KEYS(&de->de_ih->ih_key, key)) {
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print_block(de->de_bh, 0, -1, -1);
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reiserfs_panic(sb, "vs-7005", "found item %h is not directory "
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"item or does not belong to the same directory "
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"as key %K", de->de_ih, key);
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}
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#endif /* CONFIG_REISERFS_CHECK */
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/*
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* binary search in directory item by third component of the
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* key. sets de->de_entry_num of de
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*/
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retval = bin_search_in_dir_item(de, cpu_key_k_offset(key));
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path->pos_in_item = de->de_entry_num;
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if (retval != NAME_NOT_FOUND) {
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/*
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* ugly, but rename needs de_bh, de_deh, de_name,
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* de_namelen, de_objectid set
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*/
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set_de_name_and_namelen(de);
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set_de_object_key(de);
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}
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return retval;
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}
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/* Keyed 32-bit hash function using TEA in a Davis-Meyer function */
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/*
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* The third component is hashed, and you can choose from more than
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* one hash function. Per directory hashes are not yet implemented
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* but are thought about. This function should be moved to hashes.c
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* Jedi, please do so. -Hans
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*/
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static __u32 get_third_component(struct super_block *s,
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const char *name, int len)
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{
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__u32 res;
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if (!len || (len == 1 && name[0] == '.'))
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return DOT_OFFSET;
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if (len == 2 && name[0] == '.' && name[1] == '.')
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return DOT_DOT_OFFSET;
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res = REISERFS_SB(s)->s_hash_function(name, len);
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/* take bits from 7-th to 30-th including both bounds */
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res = GET_HASH_VALUE(res);
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if (res == 0)
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/*
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* needed to have no names before "." and ".." those have hash
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* value == 0 and generation conters 1 and 2 accordingly
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*/
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res = 128;
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return res + MAX_GENERATION_NUMBER;
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}
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static int reiserfs_match(struct reiserfs_dir_entry *de,
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const char *name, int namelen)
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{
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int retval = NAME_NOT_FOUND;
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if ((namelen == de->de_namelen) &&
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!memcmp(de->de_name, name, de->de_namelen))
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retval =
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(de_visible(de->de_deh + de->de_entry_num) ? NAME_FOUND :
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NAME_FOUND_INVISIBLE);
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return retval;
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}
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/* de's de_bh, de_ih, de_deh, de_item_num, de_entry_num are set already */
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/* used when hash collisions exist */
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static int linear_search_in_dir_item(struct cpu_key *key,
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struct reiserfs_dir_entry *de,
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const char *name, int namelen)
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{
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struct reiserfs_de_head *deh = de->de_deh;
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int retval;
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int i;
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i = de->de_entry_num;
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if (i == ih_entry_count(de->de_ih) ||
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GET_HASH_VALUE(deh_offset(deh + i)) !=
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GET_HASH_VALUE(cpu_key_k_offset(key))) {
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i--;
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}
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RFALSE(de->de_deh != B_I_DEH(de->de_bh, de->de_ih),
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"vs-7010: array of entry headers not found");
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deh += i;
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for (; i >= 0; i--, deh--) {
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/* hash value does not match, no need to check whole name */
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if (GET_HASH_VALUE(deh_offset(deh)) !=
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GET_HASH_VALUE(cpu_key_k_offset(key))) {
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return NAME_NOT_FOUND;
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}
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/* mark that this generation number is used */
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if (de->de_gen_number_bit_string)
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set_bit(GET_GENERATION_NUMBER(deh_offset(deh)),
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de->de_gen_number_bit_string);
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/* calculate pointer to name and namelen */
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de->de_entry_num = i;
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set_de_name_and_namelen(de);
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/*
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* de's de_name, de_namelen, de_recordlen are set.
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* Fill the rest.
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*/
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if ((retval =
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reiserfs_match(de, name, namelen)) != NAME_NOT_FOUND) {
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/* key of pointed object */
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set_de_object_key(de);
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store_de_entry_key(de);
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/* retval can be NAME_FOUND or NAME_FOUND_INVISIBLE */
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return retval;
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}
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}
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if (GET_GENERATION_NUMBER(le_ih_k_offset(de->de_ih)) == 0)
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/*
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* we have reached left most entry in the node. In common we
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* have to go to the left neighbor, but if generation counter
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* is 0 already, we know for sure, that there is no name with
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* the same hash value
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*/
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/*
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* FIXME: this work correctly only because hash value can not
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* be 0. Btw, in case of Yura's hash it is probably possible,
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* so, this is a bug
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*/
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return NAME_NOT_FOUND;
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RFALSE(de->de_item_num,
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"vs-7015: two diritems of the same directory in one node?");
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return GOTO_PREVIOUS_ITEM;
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}
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/*
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* may return NAME_FOUND, NAME_FOUND_INVISIBLE, NAME_NOT_FOUND
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* FIXME: should add something like IOERROR
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*/
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static int reiserfs_find_entry(struct inode *dir, const char *name, int namelen,
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struct treepath *path_to_entry,
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struct reiserfs_dir_entry *de)
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{
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struct cpu_key key_to_search;
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int retval;
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if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
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return NAME_NOT_FOUND;
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/* we will search for this key in the tree */
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make_cpu_key(&key_to_search, dir,
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get_third_component(dir->i_sb, name, namelen),
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TYPE_DIRENTRY, 3);
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while (1) {
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retval =
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search_by_entry_key(dir->i_sb, &key_to_search,
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path_to_entry, de);
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if (retval == IO_ERROR) {
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reiserfs_error(dir->i_sb, "zam-7001", "io error");
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return IO_ERROR;
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}
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/* compare names for all entries having given hash value */
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retval =
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linear_search_in_dir_item(&key_to_search, de, name,
|
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namelen);
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/*
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* there is no need to scan directory anymore.
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* Given entry found or does not exist
|
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*/
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if (retval != GOTO_PREVIOUS_ITEM) {
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path_to_entry->pos_in_item = de->de_entry_num;
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return retval;
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}
|
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|
|
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/*
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* there is left neighboring item of this directory
|
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* and given entry can be there
|
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*/
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set_cpu_key_k_offset(&key_to_search,
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le_ih_k_offset(de->de_ih) - 1);
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pathrelse(path_to_entry);
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} /* while (1) */
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}
|
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|
|
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static struct dentry *reiserfs_lookup(struct inode *dir, struct dentry *dentry,
|
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|
unsigned int flags)
|
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|
{
|
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|
int retval;
|
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struct inode *inode = NULL;
|
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struct reiserfs_dir_entry de;
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INITIALIZE_PATH(path_to_entry);
|
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|
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if (REISERFS_MAX_NAME(dir->i_sb->s_blocksize) < dentry->d_name.len)
|
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return ERR_PTR(-ENAMETOOLONG);
|
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|
|
||
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reiserfs_write_lock(dir->i_sb);
|
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|
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de.de_gen_number_bit_string = NULL;
|
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retval =
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reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
|
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&path_to_entry, &de);
|
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pathrelse(&path_to_entry);
|
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if (retval == NAME_FOUND) {
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inode = reiserfs_iget(dir->i_sb,
|
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(struct cpu_key *)&de.de_dir_id);
|
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|
if (!inode || IS_ERR(inode)) {
|
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reiserfs_write_unlock(dir->i_sb);
|
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return ERR_PTR(-EACCES);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Propagate the private flag so we know we're
|
||
|
* in the priv tree. Also clear IOP_XATTR
|
||
|
* since we don't have xattrs on xattr files.
|
||
|
*/
|
||
|
if (IS_PRIVATE(dir)) {
|
||
|
inode->i_flags |= S_PRIVATE;
|
||
|
inode->i_opflags &= ~IOP_XATTR;
|
||
|
}
|
||
|
}
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
if (retval == IO_ERROR) {
|
||
|
return ERR_PTR(-EIO);
|
||
|
}
|
||
|
|
||
|
return d_splice_alias(inode, dentry);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* looks up the dentry of the parent directory for child.
|
||
|
* taken from ext2_get_parent
|
||
|
*/
|
||
|
struct dentry *reiserfs_get_parent(struct dentry *child)
|
||
|
{
|
||
|
int retval;
|
||
|
struct inode *inode = NULL;
|
||
|
struct reiserfs_dir_entry de;
|
||
|
INITIALIZE_PATH(path_to_entry);
|
||
|
struct inode *dir = d_inode(child);
|
||
|
|
||
|
if (dir->i_nlink == 0) {
|
||
|
return ERR_PTR(-ENOENT);
|
||
|
}
|
||
|
de.de_gen_number_bit_string = NULL;
|
||
|
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
retval = reiserfs_find_entry(dir, "..", 2, &path_to_entry, &de);
|
||
|
pathrelse(&path_to_entry);
|
||
|
if (retval != NAME_FOUND) {
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return ERR_PTR(-ENOENT);
|
||
|
}
|
||
|
inode = reiserfs_iget(dir->i_sb, (struct cpu_key *)&de.de_dir_id);
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
|
||
|
return d_obtain_alias(inode);
|
||
|
}
|
||
|
|
||
|
/* add entry to the directory (entry can be hidden).
|
||
|
|
||
|
insert definition of when hidden directories are used here -Hans
|
||
|
|
||
|
Does not mark dir inode dirty, do it after successesfull call to it */
|
||
|
|
||
|
static int reiserfs_add_entry(struct reiserfs_transaction_handle *th,
|
||
|
struct inode *dir, const char *name, int namelen,
|
||
|
struct inode *inode, int visible)
|
||
|
{
|
||
|
struct cpu_key entry_key;
|
||
|
struct reiserfs_de_head *deh;
|
||
|
INITIALIZE_PATH(path);
|
||
|
struct reiserfs_dir_entry de;
|
||
|
DECLARE_BITMAP(bit_string, MAX_GENERATION_NUMBER + 1);
|
||
|
int gen_number;
|
||
|
|
||
|
/*
|
||
|
* 48 bytes now and we avoid kmalloc if we
|
||
|
* create file with short name
|
||
|
*/
|
||
|
char small_buf[32 + DEH_SIZE];
|
||
|
|
||
|
char *buffer;
|
||
|
int buflen, paste_size;
|
||
|
int retval;
|
||
|
|
||
|
BUG_ON(!th->t_trans_id);
|
||
|
|
||
|
/* cannot allow items to be added into a busy deleted directory */
|
||
|
if (!namelen)
|
||
|
return -EINVAL;
|
||
|
|
||
|
if (namelen > REISERFS_MAX_NAME(dir->i_sb->s_blocksize))
|
||
|
return -ENAMETOOLONG;
|
||
|
|
||
|
/* each entry has unique key. compose it */
|
||
|
make_cpu_key(&entry_key, dir,
|
||
|
get_third_component(dir->i_sb, name, namelen),
|
||
|
TYPE_DIRENTRY, 3);
|
||
|
|
||
|
/* get memory for composing the entry */
|
||
|
buflen = DEH_SIZE + ROUND_UP(namelen);
|
||
|
if (buflen > sizeof(small_buf)) {
|
||
|
buffer = kmalloc(buflen, GFP_NOFS);
|
||
|
if (!buffer)
|
||
|
return -ENOMEM;
|
||
|
} else
|
||
|
buffer = small_buf;
|
||
|
|
||
|
paste_size =
|
||
|
(get_inode_sd_version(dir) ==
|
||
|
STAT_DATA_V1) ? (DEH_SIZE + namelen) : buflen;
|
||
|
|
||
|
/*
|
||
|
* fill buffer : directory entry head, name[, dir objectid | ,
|
||
|
* stat data | ,stat data, dir objectid ]
|
||
|
*/
|
||
|
deh = (struct reiserfs_de_head *)buffer;
|
||
|
deh->deh_location = 0; /* JDM Endian safe if 0 */
|
||
|
put_deh_offset(deh, cpu_key_k_offset(&entry_key));
|
||
|
deh->deh_state = 0; /* JDM Endian safe if 0 */
|
||
|
/* put key (ino analog) to de */
|
||
|
|
||
|
/* safe: k_dir_id is le */
|
||
|
deh->deh_dir_id = INODE_PKEY(inode)->k_dir_id;
|
||
|
/* safe: k_objectid is le */
|
||
|
deh->deh_objectid = INODE_PKEY(inode)->k_objectid;
|
||
|
|
||
|
/* copy name */
|
||
|
memcpy((char *)(deh + 1), name, namelen);
|
||
|
/* padd by 0s to the 4 byte boundary */
|
||
|
padd_item((char *)(deh + 1), ROUND_UP(namelen), namelen);
|
||
|
|
||
|
/*
|
||
|
* entry is ready to be pasted into tree, set 'visibility'
|
||
|
* and 'stat data in entry' attributes
|
||
|
*/
|
||
|
mark_de_without_sd(deh);
|
||
|
visible ? mark_de_visible(deh) : mark_de_hidden(deh);
|
||
|
|
||
|
/* find the proper place for the new entry */
|
||
|
memset(bit_string, 0, sizeof(bit_string));
|
||
|
de.de_gen_number_bit_string = bit_string;
|
||
|
retval = reiserfs_find_entry(dir, name, namelen, &path, &de);
|
||
|
if (retval != NAME_NOT_FOUND) {
|
||
|
if (buffer != small_buf)
|
||
|
kfree(buffer);
|
||
|
pathrelse(&path);
|
||
|
|
||
|
if (retval == IO_ERROR) {
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
if (retval != NAME_FOUND) {
|
||
|
reiserfs_error(dir->i_sb, "zam-7002",
|
||
|
"reiserfs_find_entry() returned "
|
||
|
"unexpected value (%d)", retval);
|
||
|
}
|
||
|
|
||
|
return -EEXIST;
|
||
|
}
|
||
|
|
||
|
gen_number =
|
||
|
find_first_zero_bit(bit_string,
|
||
|
MAX_GENERATION_NUMBER + 1);
|
||
|
if (gen_number > MAX_GENERATION_NUMBER) {
|
||
|
/* there is no free generation number */
|
||
|
reiserfs_warning(dir->i_sb, "reiserfs-7010",
|
||
|
"Congratulations! we have got hash function "
|
||
|
"screwed up");
|
||
|
if (buffer != small_buf)
|
||
|
kfree(buffer);
|
||
|
pathrelse(&path);
|
||
|
return -EBUSY;
|
||
|
}
|
||
|
/* adjust offset of directory enrty */
|
||
|
put_deh_offset(deh, SET_GENERATION_NUMBER(deh_offset(deh), gen_number));
|
||
|
set_cpu_key_k_offset(&entry_key, deh_offset(deh));
|
||
|
|
||
|
/* update max-hash-collisions counter in reiserfs_sb_info */
|
||
|
PROC_INFO_MAX(th->t_super, max_hash_collisions, gen_number);
|
||
|
|
||
|
/* we need to re-search for the insertion point */
|
||
|
if (gen_number != 0) {
|
||
|
if (search_by_entry_key(dir->i_sb, &entry_key, &path, &de) !=
|
||
|
NAME_NOT_FOUND) {
|
||
|
reiserfs_warning(dir->i_sb, "vs-7032",
|
||
|
"entry with this key (%K) already "
|
||
|
"exists", &entry_key);
|
||
|
|
||
|
if (buffer != small_buf)
|
||
|
kfree(buffer);
|
||
|
pathrelse(&path);
|
||
|
return -EBUSY;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* perform the insertion of the entry that we have prepared */
|
||
|
retval =
|
||
|
reiserfs_paste_into_item(th, &path, &entry_key, dir, buffer,
|
||
|
paste_size);
|
||
|
if (buffer != small_buf)
|
||
|
kfree(buffer);
|
||
|
if (retval) {
|
||
|
reiserfs_check_path(&path);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
dir->i_size += paste_size;
|
||
|
dir->i_mtime = dir->i_ctime = current_time(dir);
|
||
|
if (!S_ISDIR(inode->i_mode) && visible)
|
||
|
/* reiserfs_mkdir or reiserfs_rename will do that by itself */
|
||
|
reiserfs_update_sd(th, dir);
|
||
|
|
||
|
reiserfs_check_path(&path);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* quota utility function, call if you've had to abort after calling
|
||
|
* new_inode_init, and have not called reiserfs_new_inode yet.
|
||
|
* This should only be called on inodes that do not have stat data
|
||
|
* inserted into the tree yet.
|
||
|
*/
|
||
|
static int drop_new_inode(struct inode *inode)
|
||
|
{
|
||
|
dquot_drop(inode);
|
||
|
make_bad_inode(inode);
|
||
|
inode->i_flags |= S_NOQUOTA;
|
||
|
iput(inode);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* utility function that does setup for reiserfs_new_inode.
|
||
|
* dquot_initialize needs lots of credits so it's better to have it
|
||
|
* outside of a transaction, so we had to pull some bits of
|
||
|
* reiserfs_new_inode out into this func.
|
||
|
*/
|
||
|
static int new_inode_init(struct inode *inode, struct inode *dir, umode_t mode)
|
||
|
{
|
||
|
/*
|
||
|
* Make inode invalid - just in case we are going to drop it before
|
||
|
* the initialization happens
|
||
|
*/
|
||
|
INODE_PKEY(inode)->k_objectid = 0;
|
||
|
|
||
|
/*
|
||
|
* the quota init calls have to know who to charge the quota to, so
|
||
|
* we have to set uid and gid here
|
||
|
*/
|
||
|
inode_init_owner(&init_user_ns, inode, dir, mode);
|
||
|
return dquot_initialize(inode);
|
||
|
}
|
||
|
|
||
|
static int reiserfs_create(struct user_namespace *mnt_userns, struct inode *dir,
|
||
|
struct dentry *dentry, umode_t mode, bool excl)
|
||
|
{
|
||
|
int retval;
|
||
|
struct inode *inode;
|
||
|
/*
|
||
|
* We need blocks for transaction + (user+group)*(quotas
|
||
|
* for new inode + update of quota for directory owner)
|
||
|
*/
|
||
|
int jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 2 +
|
||
|
2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
|
||
|
REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
struct reiserfs_security_handle security;
|
||
|
|
||
|
retval = dquot_initialize(dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
if (!(inode = new_inode(dir->i_sb))) {
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
retval = new_inode_init(inode, dir, mode);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
jbegin_count += reiserfs_cache_default_acl(dir);
|
||
|
retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
|
||
|
if (retval < 0) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
jbegin_count += retval;
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
|
||
|
retval = journal_begin(&th, dir->i_sb, jbegin_count);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
retval =
|
||
|
reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
|
||
|
inode, &security);
|
||
|
if (retval)
|
||
|
goto out_failed;
|
||
|
|
||
|
inode->i_op = &reiserfs_file_inode_operations;
|
||
|
inode->i_fop = &reiserfs_file_operations;
|
||
|
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
|
||
|
|
||
|
retval =
|
||
|
reiserfs_add_entry(&th, dir, dentry->d_name.name,
|
||
|
dentry->d_name.len, inode, 1 /*visible */ );
|
||
|
if (retval) {
|
||
|
int err;
|
||
|
drop_nlink(inode);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
err = journal_end(&th);
|
||
|
if (err)
|
||
|
retval = err;
|
||
|
unlock_new_inode(inode);
|
||
|
iput(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(dir);
|
||
|
|
||
|
d_instantiate_new(dentry, inode);
|
||
|
retval = journal_end(&th);
|
||
|
|
||
|
out_failed:
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
reiserfs_security_free(&security);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static int reiserfs_mknod(struct user_namespace *mnt_userns, struct inode *dir,
|
||
|
struct dentry *dentry, umode_t mode, dev_t rdev)
|
||
|
{
|
||
|
int retval;
|
||
|
struct inode *inode;
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
struct reiserfs_security_handle security;
|
||
|
/*
|
||
|
* We need blocks for transaction + (user+group)*(quotas
|
||
|
* for new inode + update of quota for directory owner)
|
||
|
*/
|
||
|
int jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 3 +
|
||
|
2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
|
||
|
REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
|
||
|
|
||
|
retval = dquot_initialize(dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
if (!(inode = new_inode(dir->i_sb))) {
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
retval = new_inode_init(inode, dir, mode);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
jbegin_count += reiserfs_cache_default_acl(dir);
|
||
|
retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
|
||
|
if (retval < 0) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
jbegin_count += retval;
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
|
||
|
retval = journal_begin(&th, dir->i_sb, jbegin_count);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
retval =
|
||
|
reiserfs_new_inode(&th, dir, mode, NULL, 0 /*i_size */ , dentry,
|
||
|
inode, &security);
|
||
|
if (retval) {
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
inode->i_op = &reiserfs_special_inode_operations;
|
||
|
init_special_inode(inode, inode->i_mode, rdev);
|
||
|
|
||
|
/* FIXME: needed for block and char devices only */
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(dir);
|
||
|
|
||
|
retval =
|
||
|
reiserfs_add_entry(&th, dir, dentry->d_name.name,
|
||
|
dentry->d_name.len, inode, 1 /*visible */ );
|
||
|
if (retval) {
|
||
|
int err;
|
||
|
drop_nlink(inode);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
err = journal_end(&th);
|
||
|
if (err)
|
||
|
retval = err;
|
||
|
unlock_new_inode(inode);
|
||
|
iput(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
d_instantiate_new(dentry, inode);
|
||
|
retval = journal_end(&th);
|
||
|
|
||
|
out_failed:
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
reiserfs_security_free(&security);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static int reiserfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
|
||
|
struct dentry *dentry, umode_t mode)
|
||
|
{
|
||
|
int retval;
|
||
|
struct inode *inode;
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
struct reiserfs_security_handle security;
|
||
|
/*
|
||
|
* We need blocks for transaction + (user+group)*(quotas
|
||
|
* for new inode + update of quota for directory owner)
|
||
|
*/
|
||
|
int jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 3 +
|
||
|
2 * (REISERFS_QUOTA_INIT_BLOCKS(dir->i_sb) +
|
||
|
REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb));
|
||
|
|
||
|
retval = dquot_initialize(dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
#ifdef DISPLACE_NEW_PACKING_LOCALITIES
|
||
|
/*
|
||
|
* set flag that new packing locality created and new blocks
|
||
|
* for the content of that directory are not displaced yet
|
||
|
*/
|
||
|
REISERFS_I(dir)->new_packing_locality = 1;
|
||
|
#endif
|
||
|
mode = S_IFDIR | mode;
|
||
|
if (!(inode = new_inode(dir->i_sb))) {
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
retval = new_inode_init(inode, dir, mode);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
jbegin_count += reiserfs_cache_default_acl(dir);
|
||
|
retval = reiserfs_security_init(dir, inode, &dentry->d_name, &security);
|
||
|
if (retval < 0) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
jbegin_count += retval;
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
|
||
|
retval = journal_begin(&th, dir->i_sb, jbegin_count);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* inc the link count now, so another writer doesn't overflow
|
||
|
* it while we sleep later on.
|
||
|
*/
|
||
|
INC_DIR_INODE_NLINK(dir)
|
||
|
|
||
|
retval = reiserfs_new_inode(&th, dir, mode, NULL /*symlink */,
|
||
|
old_format_only(dir->i_sb) ?
|
||
|
EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
|
||
|
dentry, inode, &security);
|
||
|
if (retval) {
|
||
|
DEC_DIR_INODE_NLINK(dir)
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(dir);
|
||
|
|
||
|
inode->i_op = &reiserfs_dir_inode_operations;
|
||
|
inode->i_fop = &reiserfs_dir_operations;
|
||
|
|
||
|
/* note, _this_ add_entry will not update dir's stat data */
|
||
|
retval =
|
||
|
reiserfs_add_entry(&th, dir, dentry->d_name.name,
|
||
|
dentry->d_name.len, inode, 1 /*visible */ );
|
||
|
if (retval) {
|
||
|
int err;
|
||
|
clear_nlink(inode);
|
||
|
DEC_DIR_INODE_NLINK(dir);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
err = journal_end(&th);
|
||
|
if (err)
|
||
|
retval = err;
|
||
|
unlock_new_inode(inode);
|
||
|
iput(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
/* the above add_entry did not update dir's stat data */
|
||
|
reiserfs_update_sd(&th, dir);
|
||
|
|
||
|
d_instantiate_new(dentry, inode);
|
||
|
retval = journal_end(&th);
|
||
|
out_failed:
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
reiserfs_security_free(&security);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static inline int reiserfs_empty_dir(struct inode *inode)
|
||
|
{
|
||
|
/*
|
||
|
* we can cheat because an old format dir cannot have
|
||
|
* EMPTY_DIR_SIZE, and a new format dir cannot have
|
||
|
* EMPTY_DIR_SIZE_V1. So, if the inode is either size,
|
||
|
* regardless of disk format version, the directory is empty.
|
||
|
*/
|
||
|
if (inode->i_size != EMPTY_DIR_SIZE &&
|
||
|
inode->i_size != EMPTY_DIR_SIZE_V1) {
|
||
|
return 0;
|
||
|
}
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
static int reiserfs_rmdir(struct inode *dir, struct dentry *dentry)
|
||
|
{
|
||
|
int retval, err;
|
||
|
struct inode *inode;
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
int jbegin_count;
|
||
|
INITIALIZE_PATH(path);
|
||
|
struct reiserfs_dir_entry de;
|
||
|
|
||
|
/*
|
||
|
* we will be doing 2 balancings and update 2 stat data, we
|
||
|
* change quotas of the owner of the directory and of the owner
|
||
|
* of the parent directory. The quota structure is possibly
|
||
|
* deleted only on last iput => outside of this transaction
|
||
|
*/
|
||
|
jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 2 + 2 +
|
||
|
4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
|
||
|
|
||
|
retval = dquot_initialize(dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
retval = journal_begin(&th, dir->i_sb, jbegin_count);
|
||
|
if (retval)
|
||
|
goto out_rmdir;
|
||
|
|
||
|
de.de_gen_number_bit_string = NULL;
|
||
|
if ((retval =
|
||
|
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
|
||
|
&path, &de)) == NAME_NOT_FOUND) {
|
||
|
retval = -ENOENT;
|
||
|
goto end_rmdir;
|
||
|
} else if (retval == IO_ERROR) {
|
||
|
retval = -EIO;
|
||
|
goto end_rmdir;
|
||
|
}
|
||
|
|
||
|
inode = d_inode(dentry);
|
||
|
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(dir);
|
||
|
|
||
|
if (de.de_objectid != inode->i_ino) {
|
||
|
/*
|
||
|
* FIXME: compare key of an object and a key found in the entry
|
||
|
*/
|
||
|
retval = -EIO;
|
||
|
goto end_rmdir;
|
||
|
}
|
||
|
if (!reiserfs_empty_dir(inode)) {
|
||
|
retval = -ENOTEMPTY;
|
||
|
goto end_rmdir;
|
||
|
}
|
||
|
|
||
|
/* cut entry from dir directory */
|
||
|
retval = reiserfs_cut_from_item(&th, &path, &de.de_entry_key,
|
||
|
dir, NULL, /* page */
|
||
|
0 /*new file size - not used here */ );
|
||
|
if (retval < 0)
|
||
|
goto end_rmdir;
|
||
|
|
||
|
if (inode->i_nlink != 2 && inode->i_nlink != 1)
|
||
|
reiserfs_error(inode->i_sb, "reiserfs-7040",
|
||
|
"empty directory has nlink != 2 (%d)",
|
||
|
inode->i_nlink);
|
||
|
|
||
|
clear_nlink(inode);
|
||
|
inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(dir);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
|
||
|
DEC_DIR_INODE_NLINK(dir)
|
||
|
dir->i_size -= (DEH_SIZE + de.de_entrylen);
|
||
|
reiserfs_update_sd(&th, dir);
|
||
|
|
||
|
/* prevent empty directory from getting lost */
|
||
|
add_save_link(&th, inode, 0 /* not truncate */ );
|
||
|
|
||
|
retval = journal_end(&th);
|
||
|
reiserfs_check_path(&path);
|
||
|
out_rmdir:
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return retval;
|
||
|
|
||
|
end_rmdir:
|
||
|
/*
|
||
|
* we must release path, because we did not call
|
||
|
* reiserfs_cut_from_item, or reiserfs_cut_from_item does not
|
||
|
* release path if operation was not complete
|
||
|
*/
|
||
|
pathrelse(&path);
|
||
|
err = journal_end(&th);
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return err ? err : retval;
|
||
|
}
|
||
|
|
||
|
static int reiserfs_unlink(struct inode *dir, struct dentry *dentry)
|
||
|
{
|
||
|
int retval, err;
|
||
|
struct inode *inode;
|
||
|
struct reiserfs_dir_entry de;
|
||
|
INITIALIZE_PATH(path);
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
int jbegin_count;
|
||
|
unsigned long savelink;
|
||
|
|
||
|
retval = dquot_initialize(dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
inode = d_inode(dentry);
|
||
|
|
||
|
/*
|
||
|
* in this transaction we can be doing at max two balancings and
|
||
|
* update two stat datas, we change quotas of the owner of the
|
||
|
* directory and of the owner of the parent directory. The quota
|
||
|
* structure is possibly deleted only on iput => outside of
|
||
|
* this transaction
|
||
|
*/
|
||
|
jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 2 + 2 +
|
||
|
4 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
|
||
|
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
retval = journal_begin(&th, dir->i_sb, jbegin_count);
|
||
|
if (retval)
|
||
|
goto out_unlink;
|
||
|
|
||
|
de.de_gen_number_bit_string = NULL;
|
||
|
if ((retval =
|
||
|
reiserfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len,
|
||
|
&path, &de)) == NAME_NOT_FOUND) {
|
||
|
retval = -ENOENT;
|
||
|
goto end_unlink;
|
||
|
} else if (retval == IO_ERROR) {
|
||
|
retval = -EIO;
|
||
|
goto end_unlink;
|
||
|
}
|
||
|
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(dir);
|
||
|
|
||
|
if (de.de_objectid != inode->i_ino) {
|
||
|
/*
|
||
|
* FIXME: compare key of an object and a key found in the entry
|
||
|
*/
|
||
|
retval = -EIO;
|
||
|
goto end_unlink;
|
||
|
}
|
||
|
|
||
|
if (!inode->i_nlink) {
|
||
|
reiserfs_warning(inode->i_sb, "reiserfs-7042",
|
||
|
"deleting nonexistent file (%lu), %d",
|
||
|
inode->i_ino, inode->i_nlink);
|
||
|
set_nlink(inode, 1);
|
||
|
}
|
||
|
|
||
|
drop_nlink(inode);
|
||
|
|
||
|
/*
|
||
|
* we schedule before doing the add_save_link call, save the link
|
||
|
* count so we don't race
|
||
|
*/
|
||
|
savelink = inode->i_nlink;
|
||
|
|
||
|
retval =
|
||
|
reiserfs_cut_from_item(&th, &path, &de.de_entry_key, dir, NULL,
|
||
|
0);
|
||
|
if (retval < 0) {
|
||
|
inc_nlink(inode);
|
||
|
goto end_unlink;
|
||
|
}
|
||
|
inode->i_ctime = current_time(inode);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
|
||
|
dir->i_size -= (de.de_entrylen + DEH_SIZE);
|
||
|
dir->i_ctime = dir->i_mtime = current_time(dir);
|
||
|
reiserfs_update_sd(&th, dir);
|
||
|
|
||
|
if (!savelink)
|
||
|
/* prevent file from getting lost */
|
||
|
add_save_link(&th, inode, 0 /* not truncate */ );
|
||
|
|
||
|
retval = journal_end(&th);
|
||
|
reiserfs_check_path(&path);
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return retval;
|
||
|
|
||
|
end_unlink:
|
||
|
pathrelse(&path);
|
||
|
err = journal_end(&th);
|
||
|
reiserfs_check_path(&path);
|
||
|
if (err)
|
||
|
retval = err;
|
||
|
out_unlink:
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static int reiserfs_symlink(struct user_namespace *mnt_userns,
|
||
|
struct inode *parent_dir, struct dentry *dentry,
|
||
|
const char *symname)
|
||
|
{
|
||
|
int retval;
|
||
|
struct inode *inode;
|
||
|
char *name;
|
||
|
int item_len;
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
struct reiserfs_security_handle security;
|
||
|
int mode = S_IFLNK | S_IRWXUGO;
|
||
|
/*
|
||
|
* We need blocks for transaction + (user+group)*(quotas for
|
||
|
* new inode + update of quota for directory owner)
|
||
|
*/
|
||
|
int jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 3 +
|
||
|
2 * (REISERFS_QUOTA_INIT_BLOCKS(parent_dir->i_sb) +
|
||
|
REISERFS_QUOTA_TRANS_BLOCKS(parent_dir->i_sb));
|
||
|
|
||
|
retval = dquot_initialize(parent_dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
if (!(inode = new_inode(parent_dir->i_sb))) {
|
||
|
return -ENOMEM;
|
||
|
}
|
||
|
retval = new_inode_init(inode, parent_dir, mode);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
retval = reiserfs_security_init(parent_dir, inode, &dentry->d_name,
|
||
|
&security);
|
||
|
if (retval < 0) {
|
||
|
drop_new_inode(inode);
|
||
|
return retval;
|
||
|
}
|
||
|
jbegin_count += retval;
|
||
|
|
||
|
reiserfs_write_lock(parent_dir->i_sb);
|
||
|
item_len = ROUND_UP(strlen(symname));
|
||
|
if (item_len > MAX_DIRECT_ITEM_LEN(parent_dir->i_sb->s_blocksize)) {
|
||
|
retval = -ENAMETOOLONG;
|
||
|
drop_new_inode(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
name = kmalloc(item_len, GFP_NOFS);
|
||
|
if (!name) {
|
||
|
drop_new_inode(inode);
|
||
|
retval = -ENOMEM;
|
||
|
goto out_failed;
|
||
|
}
|
||
|
memcpy(name, symname, strlen(symname));
|
||
|
padd_item(name, item_len, strlen(symname));
|
||
|
|
||
|
retval = journal_begin(&th, parent_dir->i_sb, jbegin_count);
|
||
|
if (retval) {
|
||
|
drop_new_inode(inode);
|
||
|
kfree(name);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
retval =
|
||
|
reiserfs_new_inode(&th, parent_dir, mode, name, strlen(symname),
|
||
|
dentry, inode, &security);
|
||
|
kfree(name);
|
||
|
if (retval) { /* reiserfs_new_inode iputs for us */
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(parent_dir);
|
||
|
|
||
|
inode->i_op = &reiserfs_symlink_inode_operations;
|
||
|
inode_nohighmem(inode);
|
||
|
inode->i_mapping->a_ops = &reiserfs_address_space_operations;
|
||
|
|
||
|
retval = reiserfs_add_entry(&th, parent_dir, dentry->d_name.name,
|
||
|
dentry->d_name.len, inode, 1 /*visible */ );
|
||
|
if (retval) {
|
||
|
int err;
|
||
|
drop_nlink(inode);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
err = journal_end(&th);
|
||
|
if (err)
|
||
|
retval = err;
|
||
|
unlock_new_inode(inode);
|
||
|
iput(inode);
|
||
|
goto out_failed;
|
||
|
}
|
||
|
|
||
|
d_instantiate_new(dentry, inode);
|
||
|
retval = journal_end(&th);
|
||
|
out_failed:
|
||
|
reiserfs_write_unlock(parent_dir->i_sb);
|
||
|
reiserfs_security_free(&security);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static int reiserfs_link(struct dentry *old_dentry, struct inode *dir,
|
||
|
struct dentry *dentry)
|
||
|
{
|
||
|
int retval;
|
||
|
struct inode *inode = d_inode(old_dentry);
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
/*
|
||
|
* We need blocks for transaction + update of quotas for
|
||
|
* the owners of the directory
|
||
|
*/
|
||
|
int jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 3 +
|
||
|
2 * REISERFS_QUOTA_TRANS_BLOCKS(dir->i_sb);
|
||
|
|
||
|
retval = dquot_initialize(dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
reiserfs_write_lock(dir->i_sb);
|
||
|
if (inode->i_nlink >= REISERFS_LINK_MAX) {
|
||
|
/* FIXME: sd_nlink is 32 bit for new files */
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return -EMLINK;
|
||
|
}
|
||
|
|
||
|
/* inc before scheduling so reiserfs_unlink knows we are here */
|
||
|
inc_nlink(inode);
|
||
|
|
||
|
retval = journal_begin(&th, dir->i_sb, jbegin_count);
|
||
|
if (retval) {
|
||
|
drop_nlink(inode);
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/* create new entry */
|
||
|
retval =
|
||
|
reiserfs_add_entry(&th, dir, dentry->d_name.name,
|
||
|
dentry->d_name.len, inode, 1 /*visible */ );
|
||
|
|
||
|
reiserfs_update_inode_transaction(inode);
|
||
|
reiserfs_update_inode_transaction(dir);
|
||
|
|
||
|
if (retval) {
|
||
|
int err;
|
||
|
drop_nlink(inode);
|
||
|
err = journal_end(&th);
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return err ? err : retval;
|
||
|
}
|
||
|
|
||
|
inode->i_ctime = current_time(inode);
|
||
|
reiserfs_update_sd(&th, inode);
|
||
|
|
||
|
ihold(inode);
|
||
|
d_instantiate(dentry, inode);
|
||
|
retval = journal_end(&th);
|
||
|
reiserfs_write_unlock(dir->i_sb);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/* de contains information pointing to an entry which */
|
||
|
static int de_still_valid(const char *name, int len,
|
||
|
struct reiserfs_dir_entry *de)
|
||
|
{
|
||
|
struct reiserfs_dir_entry tmp = *de;
|
||
|
|
||
|
/* recalculate pointer to name and name length */
|
||
|
set_de_name_and_namelen(&tmp);
|
||
|
/* FIXME: could check more */
|
||
|
if (tmp.de_namelen != len || memcmp(name, de->de_name, len))
|
||
|
return 0;
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
static int entry_points_to_object(const char *name, int len,
|
||
|
struct reiserfs_dir_entry *de,
|
||
|
struct inode *inode)
|
||
|
{
|
||
|
if (!de_still_valid(name, len, de))
|
||
|
return 0;
|
||
|
|
||
|
if (inode) {
|
||
|
if (!de_visible(de->de_deh + de->de_entry_num))
|
||
|
reiserfs_panic(inode->i_sb, "vs-7042",
|
||
|
"entry must be visible");
|
||
|
return (de->de_objectid == inode->i_ino) ? 1 : 0;
|
||
|
}
|
||
|
|
||
|
/* this must be added hidden entry */
|
||
|
if (de_visible(de->de_deh + de->de_entry_num))
|
||
|
reiserfs_panic(NULL, "vs-7043", "entry must be visible");
|
||
|
|
||
|
return 1;
|
||
|
}
|
||
|
|
||
|
/* sets key of objectid the entry has to point to */
|
||
|
static void set_ino_in_dir_entry(struct reiserfs_dir_entry *de,
|
||
|
struct reiserfs_key *key)
|
||
|
{
|
||
|
/* JDM These operations are endian safe - both are le */
|
||
|
de->de_deh[de->de_entry_num].deh_dir_id = key->k_dir_id;
|
||
|
de->de_deh[de->de_entry_num].deh_objectid = key->k_objectid;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* process, that is going to call fix_nodes/do_balance must hold only
|
||
|
* one path. If it holds 2 or more, it can get into endless waiting in
|
||
|
* get_empty_nodes or its clones
|
||
|
*/
|
||
|
static int reiserfs_rename(struct user_namespace *mnt_userns,
|
||
|
struct inode *old_dir, struct dentry *old_dentry,
|
||
|
struct inode *new_dir, struct dentry *new_dentry,
|
||
|
unsigned int flags)
|
||
|
{
|
||
|
int retval;
|
||
|
INITIALIZE_PATH(old_entry_path);
|
||
|
INITIALIZE_PATH(new_entry_path);
|
||
|
INITIALIZE_PATH(dot_dot_entry_path);
|
||
|
struct item_head new_entry_ih, old_entry_ih, dot_dot_ih;
|
||
|
struct reiserfs_dir_entry old_de, new_de, dot_dot_de;
|
||
|
struct inode *old_inode, *new_dentry_inode;
|
||
|
struct reiserfs_transaction_handle th;
|
||
|
int jbegin_count;
|
||
|
umode_t old_inode_mode;
|
||
|
unsigned long savelink = 1;
|
||
|
struct timespec64 ctime;
|
||
|
|
||
|
if (flags & ~RENAME_NOREPLACE)
|
||
|
return -EINVAL;
|
||
|
|
||
|
/*
|
||
|
* three balancings: (1) old name removal, (2) new name insertion
|
||
|
* and (3) maybe "save" link insertion
|
||
|
* stat data updates: (1) old directory,
|
||
|
* (2) new directory and (3) maybe old object stat data (when it is
|
||
|
* directory) and (4) maybe stat data of object to which new entry
|
||
|
* pointed initially and (5) maybe block containing ".." of
|
||
|
* renamed directory
|
||
|
* quota updates: two parent directories
|
||
|
*/
|
||
|
jbegin_count =
|
||
|
JOURNAL_PER_BALANCE_CNT * 3 + 5 +
|
||
|
4 * REISERFS_QUOTA_TRANS_BLOCKS(old_dir->i_sb);
|
||
|
|
||
|
retval = dquot_initialize(old_dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
retval = dquot_initialize(new_dir);
|
||
|
if (retval)
|
||
|
return retval;
|
||
|
|
||
|
old_inode = d_inode(old_dentry);
|
||
|
new_dentry_inode = d_inode(new_dentry);
|
||
|
|
||
|
/*
|
||
|
* make sure that oldname still exists and points to an object we
|
||
|
* are going to rename
|
||
|
*/
|
||
|
old_de.de_gen_number_bit_string = NULL;
|
||
|
reiserfs_write_lock(old_dir->i_sb);
|
||
|
retval =
|
||
|
reiserfs_find_entry(old_dir, old_dentry->d_name.name,
|
||
|
old_dentry->d_name.len, &old_entry_path,
|
||
|
&old_de);
|
||
|
pathrelse(&old_entry_path);
|
||
|
if (retval == IO_ERROR) {
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
if (retval != NAME_FOUND || old_de.de_objectid != old_inode->i_ino) {
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -ENOENT;
|
||
|
}
|
||
|
|
||
|
old_inode_mode = old_inode->i_mode;
|
||
|
if (S_ISDIR(old_inode_mode)) {
|
||
|
/*
|
||
|
* make sure that directory being renamed has correct ".."
|
||
|
* and that its new parent directory has not too many links
|
||
|
* already
|
||
|
*/
|
||
|
if (new_dentry_inode) {
|
||
|
if (!reiserfs_empty_dir(new_dentry_inode)) {
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -ENOTEMPTY;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* directory is renamed, its parent directory will be changed,
|
||
|
* so find ".." entry
|
||
|
*/
|
||
|
dot_dot_de.de_gen_number_bit_string = NULL;
|
||
|
retval =
|
||
|
reiserfs_find_entry(old_inode, "..", 2, &dot_dot_entry_path,
|
||
|
&dot_dot_de);
|
||
|
pathrelse(&dot_dot_entry_path);
|
||
|
if (retval != NAME_FOUND) {
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
/* inode number of .. must equal old_dir->i_ino */
|
||
|
if (dot_dot_de.de_objectid != old_dir->i_ino) {
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -EIO;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
retval = journal_begin(&th, old_dir->i_sb, jbegin_count);
|
||
|
if (retval) {
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/* add new entry (or find the existing one) */
|
||
|
retval =
|
||
|
reiserfs_add_entry(&th, new_dir, new_dentry->d_name.name,
|
||
|
new_dentry->d_name.len, old_inode, 0);
|
||
|
if (retval == -EEXIST) {
|
||
|
if (!new_dentry_inode) {
|
||
|
reiserfs_panic(old_dir->i_sb, "vs-7050",
|
||
|
"new entry is found, new inode == 0");
|
||
|
}
|
||
|
} else if (retval) {
|
||
|
int err = journal_end(&th);
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return err ? err : retval;
|
||
|
}
|
||
|
|
||
|
reiserfs_update_inode_transaction(old_dir);
|
||
|
reiserfs_update_inode_transaction(new_dir);
|
||
|
|
||
|
/*
|
||
|
* this makes it so an fsync on an open fd for the old name will
|
||
|
* commit the rename operation
|
||
|
*/
|
||
|
reiserfs_update_inode_transaction(old_inode);
|
||
|
|
||
|
if (new_dentry_inode)
|
||
|
reiserfs_update_inode_transaction(new_dentry_inode);
|
||
|
|
||
|
while (1) {
|
||
|
/*
|
||
|
* look for old name using corresponding entry key
|
||
|
* (found by reiserfs_find_entry)
|
||
|
*/
|
||
|
if ((retval =
|
||
|
search_by_entry_key(new_dir->i_sb, &old_de.de_entry_key,
|
||
|
&old_entry_path,
|
||
|
&old_de)) != NAME_FOUND) {
|
||
|
pathrelse(&old_entry_path);
|
||
|
journal_end(&th);
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
copy_item_head(&old_entry_ih, tp_item_head(&old_entry_path));
|
||
|
|
||
|
reiserfs_prepare_for_journal(old_inode->i_sb, old_de.de_bh, 1);
|
||
|
|
||
|
/* look for new name by reiserfs_find_entry */
|
||
|
new_de.de_gen_number_bit_string = NULL;
|
||
|
retval =
|
||
|
reiserfs_find_entry(new_dir, new_dentry->d_name.name,
|
||
|
new_dentry->d_name.len, &new_entry_path,
|
||
|
&new_de);
|
||
|
/*
|
||
|
* reiserfs_add_entry should not return IO_ERROR,
|
||
|
* because it is called with essentially same parameters from
|
||
|
* reiserfs_add_entry above, and we'll catch any i/o errors
|
||
|
* before we get here.
|
||
|
*/
|
||
|
if (retval != NAME_FOUND_INVISIBLE && retval != NAME_FOUND) {
|
||
|
pathrelse(&new_entry_path);
|
||
|
pathrelse(&old_entry_path);
|
||
|
journal_end(&th);
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -EIO;
|
||
|
}
|
||
|
|
||
|
copy_item_head(&new_entry_ih, tp_item_head(&new_entry_path));
|
||
|
|
||
|
reiserfs_prepare_for_journal(old_inode->i_sb, new_de.de_bh, 1);
|
||
|
|
||
|
if (S_ISDIR(old_inode->i_mode)) {
|
||
|
if ((retval =
|
||
|
search_by_entry_key(new_dir->i_sb,
|
||
|
&dot_dot_de.de_entry_key,
|
||
|
&dot_dot_entry_path,
|
||
|
&dot_dot_de)) != NAME_FOUND) {
|
||
|
pathrelse(&dot_dot_entry_path);
|
||
|
pathrelse(&new_entry_path);
|
||
|
pathrelse(&old_entry_path);
|
||
|
journal_end(&th);
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return -EIO;
|
||
|
}
|
||
|
copy_item_head(&dot_dot_ih,
|
||
|
tp_item_head(&dot_dot_entry_path));
|
||
|
/* node containing ".." gets into transaction */
|
||
|
reiserfs_prepare_for_journal(old_inode->i_sb,
|
||
|
dot_dot_de.de_bh, 1);
|
||
|
}
|
||
|
/*
|
||
|
* we should check seals here, not do
|
||
|
* this stuff, yes? Then, having
|
||
|
* gathered everything into RAM we
|
||
|
* should lock the buffers, yes? -Hans
|
||
|
*/
|
||
|
/*
|
||
|
* probably. our rename needs to hold more
|
||
|
* than one path at once. The seals would
|
||
|
* have to be written to deal with multi-path
|
||
|
* issues -chris
|
||
|
*/
|
||
|
/*
|
||
|
* sanity checking before doing the rename - avoid races many
|
||
|
* of the above checks could have scheduled. We have to be
|
||
|
* sure our items haven't been shifted by another process.
|
||
|
*/
|
||
|
if (item_moved(&new_entry_ih, &new_entry_path) ||
|
||
|
!entry_points_to_object(new_dentry->d_name.name,
|
||
|
new_dentry->d_name.len,
|
||
|
&new_de, new_dentry_inode) ||
|
||
|
item_moved(&old_entry_ih, &old_entry_path) ||
|
||
|
!entry_points_to_object(old_dentry->d_name.name,
|
||
|
old_dentry->d_name.len,
|
||
|
&old_de, old_inode)) {
|
||
|
reiserfs_restore_prepared_buffer(old_inode->i_sb,
|
||
|
new_de.de_bh);
|
||
|
reiserfs_restore_prepared_buffer(old_inode->i_sb,
|
||
|
old_de.de_bh);
|
||
|
if (S_ISDIR(old_inode_mode))
|
||
|
reiserfs_restore_prepared_buffer(old_inode->
|
||
|
i_sb,
|
||
|
dot_dot_de.
|
||
|
de_bh);
|
||
|
continue;
|
||
|
}
|
||
|
if (S_ISDIR(old_inode_mode)) {
|
||
|
if (item_moved(&dot_dot_ih, &dot_dot_entry_path) ||
|
||
|
!entry_points_to_object("..", 2, &dot_dot_de,
|
||
|
old_dir)) {
|
||
|
reiserfs_restore_prepared_buffer(old_inode->
|
||
|
i_sb,
|
||
|
old_de.de_bh);
|
||
|
reiserfs_restore_prepared_buffer(old_inode->
|
||
|
i_sb,
|
||
|
new_de.de_bh);
|
||
|
reiserfs_restore_prepared_buffer(old_inode->
|
||
|
i_sb,
|
||
|
dot_dot_de.
|
||
|
de_bh);
|
||
|
continue;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
RFALSE(S_ISDIR(old_inode_mode) &&
|
||
|
!buffer_journal_prepared(dot_dot_de.de_bh), "");
|
||
|
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* ok, all the changes can be done in one fell swoop when we
|
||
|
* have claimed all the buffers needed.
|
||
|
*/
|
||
|
|
||
|
mark_de_visible(new_de.de_deh + new_de.de_entry_num);
|
||
|
set_ino_in_dir_entry(&new_de, INODE_PKEY(old_inode));
|
||
|
journal_mark_dirty(&th, new_de.de_bh);
|
||
|
|
||
|
mark_de_hidden(old_de.de_deh + old_de.de_entry_num);
|
||
|
journal_mark_dirty(&th, old_de.de_bh);
|
||
|
ctime = current_time(old_dir);
|
||
|
old_dir->i_ctime = old_dir->i_mtime = ctime;
|
||
|
new_dir->i_ctime = new_dir->i_mtime = ctime;
|
||
|
/*
|
||
|
* thanks to Alex Adriaanse <alex_a@caltech.edu> for patch
|
||
|
* which adds ctime update of renamed object
|
||
|
*/
|
||
|
old_inode->i_ctime = ctime;
|
||
|
|
||
|
if (new_dentry_inode) {
|
||
|
/* adjust link number of the victim */
|
||
|
if (S_ISDIR(new_dentry_inode->i_mode)) {
|
||
|
clear_nlink(new_dentry_inode);
|
||
|
} else {
|
||
|
drop_nlink(new_dentry_inode);
|
||
|
}
|
||
|
new_dentry_inode->i_ctime = ctime;
|
||
|
savelink = new_dentry_inode->i_nlink;
|
||
|
}
|
||
|
|
||
|
if (S_ISDIR(old_inode_mode)) {
|
||
|
/* adjust ".." of renamed directory */
|
||
|
set_ino_in_dir_entry(&dot_dot_de, INODE_PKEY(new_dir));
|
||
|
journal_mark_dirty(&th, dot_dot_de.de_bh);
|
||
|
|
||
|
/*
|
||
|
* there (in new_dir) was no directory, so it got new link
|
||
|
* (".." of renamed directory)
|
||
|
*/
|
||
|
if (!new_dentry_inode)
|
||
|
INC_DIR_INODE_NLINK(new_dir);
|
||
|
|
||
|
/* old directory lost one link - ".. " of renamed directory */
|
||
|
DEC_DIR_INODE_NLINK(old_dir);
|
||
|
}
|
||
|
/*
|
||
|
* looks like in 2.3.99pre3 brelse is atomic.
|
||
|
* so we can use pathrelse
|
||
|
*/
|
||
|
pathrelse(&new_entry_path);
|
||
|
pathrelse(&dot_dot_entry_path);
|
||
|
|
||
|
/*
|
||
|
* FIXME: this reiserfs_cut_from_item's return value may screw up
|
||
|
* anybody, but it will panic if will not be able to find the
|
||
|
* entry. This needs one more clean up
|
||
|
*/
|
||
|
if (reiserfs_cut_from_item
|
||
|
(&th, &old_entry_path, &old_de.de_entry_key, old_dir, NULL,
|
||
|
0) < 0)
|
||
|
reiserfs_error(old_dir->i_sb, "vs-7060",
|
||
|
"couldn't not cut old name. Fsck later?");
|
||
|
|
||
|
old_dir->i_size -= DEH_SIZE + old_de.de_entrylen;
|
||
|
|
||
|
reiserfs_update_sd(&th, old_dir);
|
||
|
reiserfs_update_sd(&th, new_dir);
|
||
|
reiserfs_update_sd(&th, old_inode);
|
||
|
|
||
|
if (new_dentry_inode) {
|
||
|
if (savelink == 0)
|
||
|
add_save_link(&th, new_dentry_inode,
|
||
|
0 /* not truncate */ );
|
||
|
reiserfs_update_sd(&th, new_dentry_inode);
|
||
|
}
|
||
|
|
||
|
retval = journal_end(&th);
|
||
|
reiserfs_write_unlock(old_dir->i_sb);
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
/* directories can handle most operations... */
|
||
|
const struct inode_operations reiserfs_dir_inode_operations = {
|
||
|
.create = reiserfs_create,
|
||
|
.lookup = reiserfs_lookup,
|
||
|
.link = reiserfs_link,
|
||
|
.unlink = reiserfs_unlink,
|
||
|
.symlink = reiserfs_symlink,
|
||
|
.mkdir = reiserfs_mkdir,
|
||
|
.rmdir = reiserfs_rmdir,
|
||
|
.mknod = reiserfs_mknod,
|
||
|
.rename = reiserfs_rename,
|
||
|
.setattr = reiserfs_setattr,
|
||
|
.listxattr = reiserfs_listxattr,
|
||
|
.permission = reiserfs_permission,
|
||
|
.get_acl = reiserfs_get_acl,
|
||
|
.set_acl = reiserfs_set_acl,
|
||
|
.fileattr_get = reiserfs_fileattr_get,
|
||
|
.fileattr_set = reiserfs_fileattr_set,
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* symlink operations.. same as page_symlink_inode_operations, with xattr
|
||
|
* stuff added
|
||
|
*/
|
||
|
const struct inode_operations reiserfs_symlink_inode_operations = {
|
||
|
.get_link = page_get_link,
|
||
|
.setattr = reiserfs_setattr,
|
||
|
.listxattr = reiserfs_listxattr,
|
||
|
.permission = reiserfs_permission,
|
||
|
};
|
||
|
|
||
|
/*
|
||
|
* special file operations.. just xattr/acl stuff
|
||
|
*/
|
||
|
const struct inode_operations reiserfs_special_inode_operations = {
|
||
|
.setattr = reiserfs_setattr,
|
||
|
.listxattr = reiserfs_listxattr,
|
||
|
.permission = reiserfs_permission,
|
||
|
.get_acl = reiserfs_get_acl,
|
||
|
.set_acl = reiserfs_set_acl,
|
||
|
};
|