* the mutex locked.
*/
-#include <linux/crc32.h>
-#include <linux/slab.h>
+#include "linux_err.h"
+#include "bitops.h"
+#include "kmem.h"
+#include "crc32.h"
#include "ubifs.h"
+#include "defs.h"
+#include "debug.h"
+#include "key.h"
+#include "misc.h"
static int try_read_node(const struct ubifs_info *c, void *buf, int type,
struct ubifs_zbranch *zbr);
dbg_io("LEB %d:%d, %s, length %d", lnum, offs, dbg_ntype(type), len);
err = ubifs_leb_read(c, lnum, buf, offs, len, 1);
- if (err) {
+ if (err && err != -EBADMSG) {
ubifs_err(c, "cannot read node type %d from LEB %d:%d, error %d",
type, lnum, offs, err);
return err;
int adding)
{
struct ubifs_znode *o_znode = NULL, *znode = *zn;
- int o_n, err, cmp, unsure = 0, nn = *n;
+ int err, cmp, o_n = 0, unsure = 0, nn = *n;
cmp = fallible_matches_name(c, &znode->zbranch[nn], nm);
if (unlikely(cmp < 0))
return 1;
}
-/**
- * maybe_leb_gced - determine if a LEB may have been garbage collected.
- * @c: UBIFS file-system description object
- * @lnum: LEB number
- * @gc_seq1: garbage collection sequence number
- *
- * This function determines if @lnum may have been garbage collected since
- * sequence number @gc_seq1. If it may have been then %1 is returned, otherwise
- * %0 is returned.
- */
-static int maybe_leb_gced(struct ubifs_info *c, int lnum, int gc_seq1)
-{
- int gc_seq2, gced_lnum;
-
- gced_lnum = c->gced_lnum;
- smp_rmb();
- gc_seq2 = c->gc_seq;
- /* Same seq means no GC */
- if (gc_seq1 == gc_seq2)
- return 0;
- /* Different by more than 1 means we don't know */
- if (gc_seq1 + 1 != gc_seq2)
- return 1;
- /*
- * We have seen the sequence number has increased by 1. Now we need to
- * be sure we read the right LEB number, so read it again.
- */
- smp_rmb();
- if (gced_lnum != c->gced_lnum)
- return 1;
- /* Finally we can check lnum */
- if (gced_lnum == lnum)
- return 1;
- return 0;
-}
-
/**
* ubifs_tnc_locate - look up a file-system node and return it and its location.
* @c: UBIFS file-system description object
return err;
}
-/**
- * ubifs_tnc_get_bu_keys - lookup keys for bulk-read.
- * @c: UBIFS file-system description object
- * @bu: bulk-read parameters and results
- *
- * Lookup consecutive data node keys for the same inode that reside
- * consecutively in the same LEB. This function returns zero in case of success
- * and a negative error code in case of failure.
- *
- * Note, if the bulk-read buffer length (@bu->buf_len) is known, this function
- * makes sure bulk-read nodes fit the buffer. Otherwise, this function prepares
- * maximum possible amount of nodes for bulk-read.
- */
-int ubifs_tnc_get_bu_keys(struct ubifs_info *c, struct bu_info *bu)
-{
- int n, err = 0, lnum = -1, offs;
- int len;
- unsigned int block = key_block(c, &bu->key);
- struct ubifs_znode *znode;
-
- bu->cnt = 0;
- bu->blk_cnt = 0;
- bu->eof = 0;
-
- mutex_lock(&c->tnc_mutex);
- /* Find first key */
- err = ubifs_lookup_level0(c, &bu->key, &znode, &n);
- if (err < 0)
- goto out;
- if (err) {
- /* Key found */
- len = znode->zbranch[n].len;
- /* The buffer must be big enough for at least 1 node */
- if (len > bu->buf_len) {
- err = -EINVAL;
- goto out;
- }
- /* Add this key */
- bu->zbranch[bu->cnt++] = znode->zbranch[n];
- bu->blk_cnt += 1;
- lnum = znode->zbranch[n].lnum;
- offs = ALIGN(znode->zbranch[n].offs + len, 8);
- }
- while (1) {
- struct ubifs_zbranch *zbr;
- union ubifs_key *key;
- unsigned int next_block;
-
- /* Find next key */
- err = tnc_next(c, &znode, &n);
- if (err)
- goto out;
- zbr = &znode->zbranch[n];
- key = &zbr->key;
- /* See if there is another data key for this file */
- if (key_inum(c, key) != key_inum(c, &bu->key) ||
- key_type(c, key) != UBIFS_DATA_KEY) {
- err = -ENOENT;
- goto out;
- }
- if (lnum < 0) {
- /* First key found */
- lnum = zbr->lnum;
- offs = ALIGN(zbr->offs + zbr->len, 8);
- len = zbr->len;
- if (len > bu->buf_len) {
- err = -EINVAL;
- goto out;
- }
- } else {
- /*
- * The data nodes must be in consecutive positions in
- * the same LEB.
- */
- if (zbr->lnum != lnum || zbr->offs != offs)
- goto out;
- offs += ALIGN(zbr->len, 8);
- len = ALIGN(len, 8) + zbr->len;
- /* Must not exceed buffer length */
- if (len > bu->buf_len)
- goto out;
- }
- /* Allow for holes */
- next_block = key_block(c, key);
- bu->blk_cnt += (next_block - block - 1);
- if (bu->blk_cnt >= UBIFS_MAX_BULK_READ)
- goto out;
- block = next_block;
- /* Add this key */
- bu->zbranch[bu->cnt++] = *zbr;
- bu->blk_cnt += 1;
- /* See if we have room for more */
- if (bu->cnt >= UBIFS_MAX_BULK_READ)
- goto out;
- if (bu->blk_cnt >= UBIFS_MAX_BULK_READ)
- goto out;
- }
-out:
- if (err == -ENOENT) {
- bu->eof = 1;
- err = 0;
- }
- bu->gc_seq = c->gc_seq;
- mutex_unlock(&c->tnc_mutex);
- if (err)
- return err;
- /*
- * An enormous hole could cause bulk-read to encompass too many
- * page cache pages, so limit the number here.
- */
- if (bu->blk_cnt > UBIFS_MAX_BULK_READ)
- bu->blk_cnt = UBIFS_MAX_BULK_READ;
- /*
- * Ensure that bulk-read covers a whole number of page cache
- * pages.
- */
- if (UBIFS_BLOCKS_PER_PAGE == 1 ||
- !(bu->blk_cnt & (UBIFS_BLOCKS_PER_PAGE - 1)))
- return 0;
- if (bu->eof) {
- /* At the end of file we can round up */
- bu->blk_cnt += UBIFS_BLOCKS_PER_PAGE - 1;
- return 0;
- }
- /* Exclude data nodes that do not make up a whole page cache page */
- block = key_block(c, &bu->key) + bu->blk_cnt;
- block &= ~(UBIFS_BLOCKS_PER_PAGE - 1);
- while (bu->cnt) {
- if (key_block(c, &bu->zbranch[bu->cnt - 1].key) < block)
- break;
- bu->cnt -= 1;
- }
- return 0;
-}
-
-/**
- * read_wbuf - bulk-read from a LEB with a wbuf.
- * @wbuf: wbuf that may overlap the read
- * @buf: buffer into which to read
- * @len: read length
- * @lnum: LEB number from which to read
- * @offs: offset from which to read
- *
- * This functions returns %0 on success or a negative error code on failure.
- */
-static int read_wbuf(struct ubifs_wbuf *wbuf, void *buf, int len, int lnum,
- int offs)
-{
- const struct ubifs_info *c = wbuf->c;
- int rlen, overlap;
-
- dbg_io("LEB %d:%d, length %d", lnum, offs, len);
- ubifs_assert(c, wbuf && lnum >= 0 && lnum < c->leb_cnt && offs >= 0);
- ubifs_assert(c, !(offs & 7) && offs < c->leb_size);
- ubifs_assert(c, offs + len <= c->leb_size);
-
- spin_lock(&wbuf->lock);
- overlap = (lnum == wbuf->lnum && offs + len > wbuf->offs);
- if (!overlap) {
- /* We may safely unlock the write-buffer and read the data */
- spin_unlock(&wbuf->lock);
- return ubifs_leb_read(c, lnum, buf, offs, len, 0);
- }
-
- /* Don't read under wbuf */
- rlen = wbuf->offs - offs;
- if (rlen < 0)
- rlen = 0;
-
- /* Copy the rest from the write-buffer */
- memcpy(buf + rlen, wbuf->buf + offs + rlen - wbuf->offs, len - rlen);
- spin_unlock(&wbuf->lock);
-
- if (rlen > 0)
- /* Read everything that goes before write-buffer */
- return ubifs_leb_read(c, lnum, buf, offs, rlen, 0);
-
- return 0;
-}
-
-/**
- * validate_data_node - validate data nodes for bulk-read.
- * @c: UBIFS file-system description object
- * @buf: buffer containing data node to validate
- * @zbr: zbranch of data node to validate
- *
- * This functions returns %0 on success or a negative error code on failure.
- */
-static int validate_data_node(struct ubifs_info *c, void *buf,
- struct ubifs_zbranch *zbr)
-{
- union ubifs_key key1;
- struct ubifs_ch *ch = buf;
- int err, len;
-
- if (ch->node_type != UBIFS_DATA_NODE) {
- ubifs_err(c, "bad node type (%d but expected %d)",
- ch->node_type, UBIFS_DATA_NODE);
- goto out_err;
- }
-
- err = ubifs_check_node(c, buf, zbr->len, zbr->lnum, zbr->offs, 0, 0);
- if (err) {
- ubifs_err(c, "expected node type %d", UBIFS_DATA_NODE);
- goto out;
- }
-
- err = ubifs_node_check_hash(c, buf, zbr->hash);
- if (err) {
- ubifs_bad_hash(c, buf, zbr->hash, zbr->lnum, zbr->offs);
- return err;
- }
-
- len = le32_to_cpu(ch->len);
- if (len != zbr->len) {
- ubifs_err(c, "bad node length %d, expected %d", len, zbr->len);
- goto out_err;
- }
-
- /* Make sure the key of the read node is correct */
- key_read(c, buf + UBIFS_KEY_OFFSET, &key1);
- if (!keys_eq(c, &zbr->key, &key1)) {
- ubifs_err(c, "bad key in node at LEB %d:%d",
- zbr->lnum, zbr->offs);
- dbg_tnck(&zbr->key, "looked for key ");
- dbg_tnck(&key1, "found node's key ");
- goto out_err;
- }
-
- return 0;
-
-out_err:
- err = -EINVAL;
-out:
- ubifs_err(c, "bad node at LEB %d:%d", zbr->lnum, zbr->offs);
- ubifs_dump_node(c, buf, zbr->len);
- dump_stack();
- return err;
-}
-
-/**
- * ubifs_tnc_bulk_read - read a number of data nodes in one go.
- * @c: UBIFS file-system description object
- * @bu: bulk-read parameters and results
- *
- * This functions reads and validates the data nodes that were identified by the
- * 'ubifs_tnc_get_bu_keys()' function. This functions returns %0 on success,
- * -EAGAIN to indicate a race with GC, or another negative error code on
- * failure.
- */
-int ubifs_tnc_bulk_read(struct ubifs_info *c, struct bu_info *bu)
-{
- int lnum = bu->zbranch[0].lnum, offs = bu->zbranch[0].offs, len, err, i;
- struct ubifs_wbuf *wbuf;
- void *buf;
-
- len = bu->zbranch[bu->cnt - 1].offs;
- len += bu->zbranch[bu->cnt - 1].len - offs;
- if (len > bu->buf_len) {
- ubifs_err(c, "buffer too small %d vs %d", bu->buf_len, len);
- return -EINVAL;
- }
-
- /* Do the read */
- wbuf = ubifs_get_wbuf(c, lnum);
- if (wbuf)
- err = read_wbuf(wbuf, bu->buf, len, lnum, offs);
- else
- err = ubifs_leb_read(c, lnum, bu->buf, offs, len, 0);
-
- /* Check for a race with GC */
- if (maybe_leb_gced(c, lnum, bu->gc_seq))
- return -EAGAIN;
-
- if (err && err != -EBADMSG) {
- ubifs_err(c, "failed to read from LEB %d:%d, error %d",
- lnum, offs, err);
- dump_stack();
- dbg_tnck(&bu->key, "key ");
- return err;
- }
-
- /* Validate the nodes read */
- buf = bu->buf;
- for (i = 0; i < bu->cnt; i++) {
- err = validate_data_node(c, buf, &bu->zbranch[i]);
- if (err)
- return err;
- buf = buf + ALIGN(bu->zbranch[i].len, 8);
- }
-
- return 0;
-}
-
/**
* do_lookup_nm- look up a "hashed" node.
* @c: UBIFS file-system description object
return do_lookup_nm(c, key, node, nm);
}
-static int search_dh_cookie(struct ubifs_info *c, const union ubifs_key *key,
- struct ubifs_dent_node *dent, uint32_t cookie,
- struct ubifs_znode **zn, int *n, int exact)
-{
- int err;
- struct ubifs_znode *znode = *zn;
- struct ubifs_zbranch *zbr;
- union ubifs_key *dkey;
-
- if (!exact) {
- err = tnc_next(c, &znode, n);
- if (err)
- return err;
- }
-
- for (;;) {
- zbr = &znode->zbranch[*n];
- dkey = &zbr->key;
-
- if (key_inum(c, dkey) != key_inum(c, key) ||
- key_type(c, dkey) != key_type(c, key)) {
- return -ENOENT;
- }
-
- err = tnc_read_hashed_node(c, zbr, dent);
- if (err)
- return err;
-
- if (key_hash(c, key) == key_hash(c, dkey) &&
- le32_to_cpu(dent->cookie) == cookie) {
- *zn = znode;
- return 0;
- }
-
- err = tnc_next(c, &znode, n);
- if (err)
- return err;
- }
-}
-
-static int do_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
- struct ubifs_dent_node *dent, uint32_t cookie)
-{
- int n, err;
- struct ubifs_znode *znode;
- union ubifs_key start_key;
-
- ubifs_assert(c, is_hash_key(c, key));
-
- lowest_dent_key(c, &start_key, key_inum(c, key));
-
- mutex_lock(&c->tnc_mutex);
- err = ubifs_lookup_level0(c, &start_key, &znode, &n);
- if (unlikely(err < 0))
- goto out_unlock;
-
- err = search_dh_cookie(c, key, dent, cookie, &znode, &n, err);
-
-out_unlock:
- mutex_unlock(&c->tnc_mutex);
- return err;
-}
-
-/**
- * ubifs_tnc_lookup_dh - look up a "double hashed" node.
- * @c: UBIFS file-system description object
- * @key: node key to lookup
- * @node: the node is returned here
- * @cookie: node cookie for collision resolution
- *
- * This function looks up and reads a node which contains name hash in the key.
- * Since the hash may have collisions, there may be many nodes with the same
- * key, so we have to sequentially look to all of them until the needed one
- * with the same cookie value is found.
- * This function returns zero in case of success, %-ENOENT if the node
- * was not found, and a negative error code in case of failure.
- */
-int ubifs_tnc_lookup_dh(struct ubifs_info *c, const union ubifs_key *key,
- void *node, uint32_t cookie)
-{
- int err;
- const struct ubifs_dent_node *dent = node;
-
- if (!c->double_hash)
- return -EOPNOTSUPP;
-
- /*
- * We assume that in most of the cases there are no name collisions and
- * 'ubifs_tnc_lookup()' returns us the right direntry.
- */
- err = ubifs_tnc_lookup(c, key, node);
- if (err)
- return err;
-
- if (le32_to_cpu(dent->cookie) == cookie)
- return 0;
-
- /*
- * Unluckily, there are hash collisions and we have to iterate over
- * them look at each direntry with colliding name hash sequentially.
- */
- return do_lookup_dh(c, key, node, cookie);
-}
-
/**
* correct_parent_keys - correct parent znodes' keys.
* @c: UBIFS file-system description object
if (znode->child_cnt > 0)
return 0;
+ /* Different with linux kernel, TNC could become empty. */
+ if (!znode->parent)
+ return 0;
+
/*
* This was the last zbranch, we have to delete this znode from the
* parent.
return err;
}
-/**
- * ubifs_tnc_remove_dh - remove an index entry for a "double hashed" node.
- * @c: UBIFS file-system description object
- * @key: key of node
- * @cookie: node cookie for collision resolution
- *
- * Returns %0 on success or negative error code on failure.
- */
-int ubifs_tnc_remove_dh(struct ubifs_info *c, const union ubifs_key *key,
- uint32_t cookie)
-{
- int n, err;
- struct ubifs_znode *znode;
- struct ubifs_dent_node *dent;
- struct ubifs_zbranch *zbr;
-
- if (!c->double_hash)
- return -EOPNOTSUPP;
-
- mutex_lock(&c->tnc_mutex);
- err = lookup_level0_dirty(c, key, &znode, &n);
- if (err <= 0)
- goto out_unlock;
-
- zbr = &znode->zbranch[n];
- dent = kmalloc(UBIFS_MAX_DENT_NODE_SZ, GFP_NOFS);
- if (!dent) {
- err = -ENOMEM;
- goto out_unlock;
- }
-
- err = tnc_read_hashed_node(c, zbr, dent);
- if (err)
- goto out_free;
-
- /* If the cookie does not match, we're facing a hash collision. */
- if (le32_to_cpu(dent->cookie) != cookie) {
- union ubifs_key start_key;
-
- lowest_dent_key(c, &start_key, key_inum(c, key));
-
- err = ubifs_lookup_level0(c, &start_key, &znode, &n);
- if (unlikely(err < 0))
- goto out_free;
-
- err = search_dh_cookie(c, key, dent, cookie, &znode, &n, err);
- if (err)
- goto out_free;
- }
-
- if (znode->cnext || !ubifs_zn_dirty(znode)) {
- znode = dirty_cow_bottom_up(c, znode);
- if (IS_ERR(znode)) {
- err = PTR_ERR(znode);
- goto out_free;
- }
- }
- err = tnc_delete(c, znode, n);
-
-out_free:
- kfree(dent);
-out_unlock:
- if (!err)
- err = dbg_check_tnc(c, 0);
- mutex_unlock(&c->tnc_mutex);
- return err;
-}
-
/**
* key_in_range - determine if a key falls within a range of keys.
* @c: UBIFS file-system description object
dbg_tnc("xent '%s', ino %lu", xent->name,
(unsigned long)xattr_inum);
- ubifs_evict_xattr_inode(c, xattr_inum);
-
- fname_name(&nm) = xent->name;
+ fname_name(&nm) = (const char *)xent->name;
fname_len(&nm) = le16_to_cpu(xent->nlen);
err = ubifs_tnc_remove_nm(c, &key1, &nm);
if (err) {
mutex_unlock(&c->tnc_mutex);
return err;
}
-
-/**
- * dbg_check_inode_size - check if inode size is correct.
- * @c: UBIFS file-system description object
- * @inode: inode to check
- * @size: inode size
- *
- * This function makes sure that the inode size (@size) is correct and it does
- * not have any pages beyond @size. Returns zero if the inode is OK, %-EINVAL
- * if it has a data page beyond @size, and other negative error code in case of
- * other errors.
- */
-int dbg_check_inode_size(struct ubifs_info *c, const struct inode *inode,
- loff_t size)
-{
- int err, n;
- union ubifs_key from_key, to_key, *key;
- struct ubifs_znode *znode;
- unsigned int block;
-
- if (!S_ISREG(inode->i_mode))
- return 0;
- if (!dbg_is_chk_gen(c))
- return 0;
-
- block = (size + UBIFS_BLOCK_SIZE - 1) >> UBIFS_BLOCK_SHIFT;
- data_key_init(c, &from_key, inode->i_ino, block);
- highest_data_key(c, &to_key, inode->i_ino);
-
- mutex_lock(&c->tnc_mutex);
- err = ubifs_lookup_level0(c, &from_key, &znode, &n);
- if (err < 0)
- goto out_unlock;
-
- if (err) {
- key = &from_key;
- goto out_dump;
- }
-
- err = tnc_next(c, &znode, &n);
- if (err == -ENOENT) {
- err = 0;
- goto out_unlock;
- }
- if (err < 0)
- goto out_unlock;
-
- ubifs_assert(c, err == 0);
- key = &znode->zbranch[n].key;
- if (!key_in_range(c, key, &from_key, &to_key))
- goto out_unlock;
-
-out_dump:
- block = key_block(c, key);
- ubifs_err(c, "inode %lu has size %lld, but there are data at offset %lld",
- (unsigned long)inode->i_ino, size,
- ((loff_t)block) << UBIFS_BLOCK_SHIFT);
- mutex_unlock(&c->tnc_mutex);
- ubifs_dump_inode(c, inode);
- dump_stack();
- return -EINVAL;
-
-out_unlock:
- mutex_unlock(&c->tnc_mutex);
- return err;
-}
projects / mtd-utils.git / commitdiff