static int ext4_dx_csum_verify(struct inode *inode,
struct ext4_dir_entry *dirent);
+/*
+ * Hints to ext4_read_dirblock regarding whether we expect a directory
+ * block being read to be an index block, or a block containing
+ * directory entries (and if the latter, whether it was found via a
+ * logical block in an htree index block). This is used to control
+ * what sort of sanity checkinig ext4_read_dirblock() will do on the
+ * directory block read from the storage device. EITHER will means
+ * the caller doesn't know what kind of directory block will be read,
+ * so no specific verification will be done.
+ */
typedef enum {
- EITHER, INDEX, DIRENT
+ EITHER, INDEX, DIRENT, DIRENT_HTREE
} dirblock_type_t;
#define ext4_read_dirblock(inode, block, type) \
return bh;
}
- if (!bh) {
+ if (!bh && (type == INDEX || type == DIRENT_HTREE)) {
ext4_error_inode(inode, func, line, block,
- "Directory hole found");
+ "Directory hole found for htree %s block",
+ (type == INDEX) ? "index" : "leaf");
return ERR_PTR(-EFSCORRUPTED);
}
+ if (!bh)
+ return NULL;
dirent = (struct ext4_dir_entry *) bh->b_data;
/* Determine whether or not we have an index block */
if (is_dx(inode)) {
}
}
if (!is_dx_block) {
- if (ext4_dirent_csum_verify(inode, dirent))
+ if (ext4_dirblock_csum_verify(inode, bh))
set_buffer_verified(bh);
else {
ext4_error_inode(inode, func, line, block,
struct inode *dir, struct inode *inode);
/* checksumming functions */
-void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
- unsigned int blocksize)
+void ext4_initialize_dirent_tail(struct buffer_head *bh,
+ unsigned int blocksize)
{
+ struct ext4_dir_entry_tail *t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
+
memset(t, 0, sizeof(struct ext4_dir_entry_tail));
t->det_rec_len = ext4_rec_len_to_disk(
sizeof(struct ext4_dir_entry_tail), blocksize);
/* Walk through a dirent block to find a checksum "dirent" at the tail */
static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
- struct ext4_dir_entry *de)
+ struct buffer_head *bh)
{
struct ext4_dir_entry_tail *t;
#ifdef PARANOID
struct ext4_dir_entry *d, *top;
- d = de;
- top = (struct ext4_dir_entry *)(((void *)de) +
+ d = (struct ext4_dir_entry *)bh->b_data;
+ top = (struct ext4_dir_entry *)(bh->b_data +
(EXT4_BLOCK_SIZE(inode->i_sb) -
- sizeof(struct ext4_dir_entry_tail)));
+ sizeof(struct ext4_dir_entry_tail)));
while (d < top && d->rec_len)
d = (struct ext4_dir_entry *)(((void *)d) +
le16_to_cpu(d->rec_len));
t = (struct ext4_dir_entry_tail *)d;
#else
- t = EXT4_DIRENT_TAIL(de, EXT4_BLOCK_SIZE(inode->i_sb));
+ t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb));
#endif
if (t->det_reserved_zero1 ||
return t;
}
-static __le32 ext4_dirent_csum(struct inode *inode,
- struct ext4_dir_entry *dirent, int size)
+static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
"No space for directory leaf checksum. Please run e2fsck -D.");
}
-int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent)
+int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh)
{
struct ext4_dir_entry_tail *t;
if (!ext4_has_metadata_csum(inode->i_sb))
return 1;
- t = get_dirent_tail(inode, dirent);
+ t = get_dirent_tail(inode, bh);
if (!t) {
warn_no_space_for_csum(inode);
return 0;
}
- if (t->det_checksum != ext4_dirent_csum(inode, dirent,
- (void *)t - (void *)dirent))
+ if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data,
+ (char *)t - bh->b_data))
return 0;
return 1;
}
-static void ext4_dirent_csum_set(struct inode *inode,
- struct ext4_dir_entry *dirent)
+static void ext4_dirblock_csum_set(struct inode *inode,
+ struct buffer_head *bh)
{
struct ext4_dir_entry_tail *t;
if (!ext4_has_metadata_csum(inode->i_sb))
return;
- t = get_dirent_tail(inode, dirent);
+ t = get_dirent_tail(inode, bh);
if (!t) {
warn_no_space_for_csum(inode);
return;
}
- t->det_checksum = ext4_dirent_csum(inode, dirent,
- (void *)t - (void *)dirent);
+ t->det_checksum = ext4_dirblock_csum(inode, bh->b_data,
+ (char *)t - bh->b_data);
}
-int ext4_handle_dirty_dirent_node(handle_t *handle,
- struct inode *inode,
- struct buffer_head *bh)
+int ext4_handle_dirty_dirblock(handle_t *handle,
+ struct inode *inode,
+ struct buffer_head *bh)
{
- ext4_dirent_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
+ ext4_dirblock_csum_set(inode, bh);
return ext4_handle_dirty_metadata(handle, inode, bh);
}
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
- bh = ext4_read_dirblock(dir, block, DIRENT);
+ bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
if (IS_ERR(bh))
return PTR_ERR(bh);
hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
if (ext4_has_inline_data(dir)) {
int has_inline_data = 1;
- count = htree_inlinedir_to_tree(dir_file, dir, 0,
- &hinfo, start_hash,
- start_minor_hash,
- &has_inline_data);
+ count = ext4_inlinedir_to_tree(dir_file, dir, 0,
+ &hinfo, start_hash,
+ start_minor_hash,
+ &has_inline_data);
if (has_inline_data) {
*next_hash = ~0;
return count;
#ifdef CONFIG_UNICODE
/*
* Test whether a case-insensitive directory entry matches the filename
- * being searched for.
+ * being searched for. If quick is set, assume the name being looked up
+ * is already in the casefolded form.
*
* Returns: 0 if the directory entry matches, more than 0 if it
* doesn't match or less than zero on error.
*/
int ext4_ci_compare(const struct inode *parent, const struct qstr *name,
- const struct qstr *entry)
+ const struct qstr *entry, bool quick)
{
const struct ext4_sb_info *sbi = EXT4_SB(parent->i_sb);
const struct unicode_map *um = sbi->s_encoding;
int ret;
- ret = utf8_strncasecmp(um, name, entry);
+ if (quick)
+ ret = utf8_strncasecmp_folded(um, name, entry);
+ else
+ ret = utf8_strncasecmp(um, name, entry);
+
if (ret < 0) {
/* Handle invalid character sequence as either an error
* or as an opaque byte sequence.
return ret;
}
+
+void ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
+ struct fscrypt_str *cf_name)
+{
+ int len;
+
+ if (!IS_CASEFOLDED(dir) || !EXT4_SB(dir->i_sb)->s_encoding) {
+ cf_name->name = NULL;
+ return;
+ }
+
+ cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS);
+ if (!cf_name->name)
+ return;
+
+ len = utf8_casefold(EXT4_SB(dir->i_sb)->s_encoding,
+ iname, cf_name->name,
+ EXT4_NAME_LEN);
+ if (len <= 0) {
+ kfree(cf_name->name);
+ cf_name->name = NULL;
+ return;
+ }
+ cf_name->len = (unsigned) len;
+
+}
#endif
/*
#endif
#ifdef CONFIG_UNICODE
- if (EXT4_SB(parent->i_sb)->s_encoding && IS_CASEFOLDED(parent))
- return (ext4_ci_compare(parent, fname->usr_fname, &entry) == 0);
+ if (EXT4_SB(parent->i_sb)->s_encoding && IS_CASEFOLDED(parent)) {
+ if (fname->cf_name.name) {
+ struct qstr cf = {.name = fname->cf_name.name,
+ .len = fname->cf_name.len};
+ return !ext4_ci_compare(parent, &cf, &entry, true);
+ }
+ return !ext4_ci_compare(parent, fname->usr_fname, &entry,
+ false);
+ }
#endif
return fscrypt_match_name(&f, de->name, de->name_len);
if (!buffer_verified(bh) &&
!is_dx_internal_node(dir, block,
(struct ext4_dir_entry *)bh->b_data) &&
- !ext4_dirent_csum_verify(dir,
- (struct ext4_dir_entry *)bh->b_data)) {
+ !ext4_dirblock_csum_verify(dir, bh)) {
EXT4_ERROR_INODE(dir, "checksumming directory "
"block %lu", (unsigned long)block);
brelse(bh);
return (struct buffer_head *) frame;
do {
block = dx_get_block(frame->at);
- bh = ext4_read_dirblock(dir, block, DIRENT);
+ bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
if (IS_ERR(bh))
goto errout;
char *data1 = (*bh)->b_data, *data2;
unsigned split, move, size;
struct ext4_dir_entry_2 *de = NULL, *de2;
- struct ext4_dir_entry_tail *t;
int csum_size = 0;
int err = 0, i;
(char *) de2,
blocksize);
if (csum_size) {
- t = EXT4_DIRENT_TAIL(data2, blocksize);
- initialize_dirent_tail(t, blocksize);
-
- t = EXT4_DIRENT_TAIL(data1, blocksize);
- initialize_dirent_tail(t, blocksize);
+ ext4_initialize_dirent_tail(*bh, blocksize);
+ ext4_initialize_dirent_tail(bh2, blocksize);
}
dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
de = de2;
}
dx_insert_block(frame, hash2 + continued, newblock);
- err = ext4_handle_dirty_dirent_node(handle, dir, bh2);
+ err = ext4_handle_dirty_dirblock(handle, dir, bh2);
if (err)
goto journal_error;
err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
inode_inc_iversion(dir);
ext4_mark_inode_dirty(handle, dir);
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
- err = ext4_handle_dirty_dirent_node(handle, dir, bh);
+ err = ext4_handle_dirty_dirblock(handle, dir, bh);
if (err)
ext4_std_error(dir->i_sb, err);
return 0;
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
struct dx_entry *entries;
struct ext4_dir_entry_2 *de, *de2;
- struct ext4_dir_entry_tail *t;
- char *data1, *top;
+ char *data2, *top;
unsigned len;
int retval;
unsigned blocksize;
return PTR_ERR(bh2);
}
ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
- data1 = bh2->b_data;
+ data2 = bh2->b_data;
- memcpy (data1, de, len);
- de = (struct ext4_dir_entry_2 *) data1;
- top = data1 + len;
+ memcpy(data2, de, len);
+ de = (struct ext4_dir_entry_2 *) data2;
+ top = data2 + len;
while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top)
de = de2;
- de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
- (char *) de,
- blocksize);
+ de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
+ (char *) de, blocksize);
- if (csum_size) {
- t = EXT4_DIRENT_TAIL(data1, blocksize);
- initialize_dirent_tail(t, blocksize);
- }
+ if (csum_size)
+ ext4_initialize_dirent_tail(bh2, blocksize);
/* Initialize the root; the dot dirents already exist */
de = (struct ext4_dir_entry_2 *) (&root->dotdot);
retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
if (retval)
goto out_frames;
- retval = ext4_handle_dirty_dirent_node(handle, dir, bh2);
+ retval = ext4_handle_dirty_dirblock(handle, dir, bh2);
if (retval)
goto out_frames;
struct inode *dir = d_inode(dentry->d_parent);
struct buffer_head *bh = NULL;
struct ext4_dir_entry_2 *de;
- struct ext4_dir_entry_tail *t;
struct super_block *sb;
struct ext4_sb_info *sbi;
struct ext4_filename fname;
#ifdef CONFIG_UNICODE
if (ext4_has_strict_mode(sbi) && IS_CASEFOLDED(dir) &&
- utf8_validate(sbi->s_encoding, &dentry->d_name))
+ sbi->s_encoding && utf8_validate(sbi->s_encoding, &dentry->d_name))
return -EINVAL;
#endif
blocks = dir->i_size >> sb->s_blocksize_bits;
for (block = 0; block < blocks; block++) {
bh = ext4_read_dirblock(dir, block, DIRENT);
+ if (bh == NULL) {
+ bh = ext4_bread(handle, dir, block,
+ EXT4_GET_BLOCKS_CREATE);
+ goto add_to_new_block;
+ }
if (IS_ERR(bh)) {
retval = PTR_ERR(bh);
bh = NULL;
brelse(bh);
}
bh = ext4_append(handle, dir, &block);
+add_to_new_block:
if (IS_ERR(bh)) {
retval = PTR_ERR(bh);
bh = NULL;
de->inode = 0;
de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
- if (csum_size) {
- t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
- initialize_dirent_tail(t, blocksize);
- }
+ if (csum_size)
+ ext4_initialize_dirent_tail(bh, blocksize);
retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
out:
return PTR_ERR(frame);
entries = frame->entries;
at = frame->at;
- bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT);
+ bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT_HTREE);
if (IS_ERR(bh)) {
err = PTR_ERR(bh);
bh = NULL;
goto out;
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
- err = ext4_handle_dirty_dirent_node(handle, dir, bh);
+ err = ext4_handle_dirty_dirblock(handle, dir, bh);
if (unlikely(err))
goto out;
{
struct buffer_head *dir_block = NULL;
struct ext4_dir_entry_2 *de;
- struct ext4_dir_entry_tail *t;
ext4_lblk_t block = 0;
unsigned int blocksize = dir->i_sb->s_blocksize;
int csum_size = 0;
de = (struct ext4_dir_entry_2 *)dir_block->b_data;
ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
set_nlink(inode, 2);
- if (csum_size) {
- t = EXT4_DIRENT_TAIL(dir_block->b_data, blocksize);
- initialize_dirent_tail(t, blocksize);
- }
+ if (csum_size)
+ ext4_initialize_dirent_tail(dir_block, blocksize);
BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
- err = ext4_handle_dirty_dirent_node(handle, inode, dir_block);
+ err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
if (err)
goto out;
set_buffer_verified(dir_block);
EXT4_ERROR_INODE(inode, "invalid size");
return true;
}
- bh = ext4_read_dirblock(inode, 0, EITHER);
+ /* The first directory block must not be a hole,
+ * so treat it as DIRENT_HTREE
+ */
+ bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
if (IS_ERR(bh))
return true;
brelse(bh);
lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
bh = ext4_read_dirblock(inode, lblock, EITHER);
+ if (bh == NULL) {
+ offset += sb->s_blocksize;
+ continue;
+ }
if (IS_ERR(bh))
return true;
de = (struct ext4_dir_entry_2 *) bh->b_data;
struct buffer_head *bh;
if (!ext4_has_inline_data(inode)) {
- bh = ext4_read_dirblock(inode, 0, EITHER);
+ /* The first directory block must not be a hole, so
+ * treat it as DIRENT_HTREE
+ */
+ bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
if (IS_ERR(bh)) {
*retval = PTR_ERR(bh);
return NULL;
ent->inode,
ent->dir_bh);
} else {
- retval = ext4_handle_dirty_dirent_node(handle,
- ent->inode,
- ent->dir_bh);
+ retval = ext4_handle_dirty_dirblock(handle, ent->inode,
+ ent->dir_bh);
}
} else {
retval = ext4_mark_inode_dirty(handle, ent->inode);
ext4_mark_inode_dirty(handle, ent->dir);
BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
if (!ent->inlined) {
- retval = ext4_handle_dirty_dirent_node(handle,
- ent->dir, ent->bh);
+ retval = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh);
if (unlikely(retval)) {
ext4_std_error(ent->dir->i_sb, retval);
return retval;
projects / linux.git / blobdiff