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-rw-r--r--fs/ext4/namei.c291
1 files changed, 119 insertions, 172 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 3e1529c39808..0e28c749e273 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -83,6 +83,86 @@ static struct buffer_head *ext4_append(handle_t *handle,
return bh;
}
+static int ext4_dx_csum_verify(struct inode *inode,
+ struct ext4_dir_entry *dirent);
+
+typedef enum {
+ EITHER, INDEX, DIRENT
+} dirblock_type_t;
+
+#define ext4_read_dirblock(inode, block, type) \
+ __ext4_read_dirblock((inode), (block), (type), __LINE__)
+
+static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
+ ext4_lblk_t block,
+ dirblock_type_t type,
+ unsigned int line)
+{
+ struct buffer_head *bh;
+ struct ext4_dir_entry *dirent;
+ int err = 0, is_dx_block = 0;
+
+ bh = ext4_bread(NULL, inode, block, 0, &err);
+ if (!bh) {
+ if (err == 0) {
+ ext4_error_inode(inode, __func__, line, block,
+ "Directory hole found");
+ return ERR_PTR(-EIO);
+ }
+ __ext4_warning(inode->i_sb, __func__, line,
+ "error reading directory block "
+ "(ino %lu, block %lu)", inode->i_ino,
+ (unsigned long) block);
+ return ERR_PTR(err);
+ }
+ dirent = (struct ext4_dir_entry *) bh->b_data;
+ /* Determine whether or not we have an index block */
+ if (is_dx(inode)) {
+ if (block == 0)
+ is_dx_block = 1;
+ else if (ext4_rec_len_from_disk(dirent->rec_len,
+ inode->i_sb->s_blocksize) ==
+ inode->i_sb->s_blocksize)
+ is_dx_block = 1;
+ }
+ if (!is_dx_block && type == INDEX) {
+ ext4_error_inode(inode, __func__, line, block,
+ "directory leaf block found instead of index block");
+ return ERR_PTR(-EIO);
+ }
+ if (!EXT4_HAS_RO_COMPAT_FEATURE(inode->i_sb,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) ||
+ buffer_verified(bh))
+ return bh;
+
+ /*
+ * An empty leaf block can get mistaken for a index block; for
+ * this reason, we can only check the index checksum when the
+ * caller is sure it should be an index block.
+ */
+ if (is_dx_block && type == INDEX) {
+ if (ext4_dx_csum_verify(inode, dirent))
+ set_buffer_verified(bh);
+ else {
+ ext4_error_inode(inode, __func__, line, block,
+ "Directory index failed checksum");
+ brelse(bh);
+ return ERR_PTR(-EIO);
+ }
+ }
+ if (!is_dx_block) {
+ if (ext4_dirent_csum_verify(inode, dirent))
+ set_buffer_verified(bh);
+ else {
+ ext4_error_inode(inode, __func__, line, block,
+ "Directory block failed checksum");
+ brelse(bh);
+ return ERR_PTR(-EIO);
+ }
+ }
+ return bh;
+}
+
#ifndef assert
#define assert(test) J_ASSERT(test)
#endif
@@ -604,9 +684,9 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
u32 hash;
frame->bh = NULL;
- if (!(bh = ext4_bread(NULL, dir, 0, 0, err))) {
- if (*err == 0)
- *err = ERR_BAD_DX_DIR;
+ bh = ext4_read_dirblock(dir, 0, INDEX);
+ if (IS_ERR(bh)) {
+ *err = PTR_ERR(bh);
goto fail;
}
root = (struct dx_root *) bh->b_data;
@@ -643,15 +723,6 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
goto fail;
}
- if (!buffer_verified(bh) &&
- !ext4_dx_csum_verify(dir, (struct ext4_dir_entry *)bh->b_data)) {
- ext4_warning(dir->i_sb, "Root failed checksum");
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail;
- }
- set_buffer_verified(bh);
-
entries = (struct dx_entry *) (((char *)&root->info) +
root->info.info_length);
@@ -709,23 +780,13 @@ dx_probe(const struct qstr *d_name, struct inode *dir,
frame->entries = entries;
frame->at = at;
if (!indirect--) return frame;
- if (!(bh = ext4_bread(NULL, dir, dx_get_block(at), 0, err))) {
- if (!(*err))
- *err = ERR_BAD_DX_DIR;
+ bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
+ if (IS_ERR(bh)) {
+ *err = PTR_ERR(bh);
goto fail2;
}
entries = ((struct dx_node *) bh->b_data)->entries;
- if (!buffer_verified(bh) &&
- !ext4_dx_csum_verify(dir,
- (struct ext4_dir_entry *)bh->b_data)) {
- ext4_warning(dir->i_sb, "Node failed checksum");
- brelse(bh);
- *err = ERR_BAD_DX_DIR;
- goto fail2;
- }
- set_buffer_verified(bh);
-
if (dx_get_limit(entries) != dx_node_limit (dir)) {
ext4_warning(dir->i_sb,
"dx entry: limit != node limit");
@@ -783,7 +844,7 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
{
struct dx_frame *p;
struct buffer_head *bh;
- int err, num_frames = 0;
+ int num_frames = 0;
__u32 bhash;
p = frame;
@@ -822,26 +883,9 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
* block so no check is necessary
*/
while (num_frames--) {
- if (!(bh = ext4_bread(NULL, dir, dx_get_block(p->at),
- 0, &err))) {
- if (!err) {
- ext4_error(dir->i_sb,
- "Directory hole detected on inode %lu\n",
- dir->i_ino);
- return -EIO;
- }
- return err; /* Failure */
- }
-
- if (!buffer_verified(bh) &&
- !ext4_dx_csum_verify(dir,
- (struct ext4_dir_entry *)bh->b_data)) {
- ext4_warning(dir->i_sb, "Node failed checksum");
- brelse(bh);
- return -EIO;
- }
- set_buffer_verified(bh);
-
+ bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX);
+ if (IS_ERR(bh))
+ return PTR_ERR(bh);
p++;
brelse(p->bh);
p->bh = bh;
@@ -867,23 +911,9 @@ static int htree_dirblock_to_tree(struct file *dir_file,
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
- if (!(bh = ext4_bread(NULL, dir, block, 0, &err))) {
- if (!err) {
- err = -EIO;
- ext4_error(dir->i_sb,
- "Directory hole detected on inode %lu\n",
- dir->i_ino);
- }
- return err;
- }
-
- if (!buffer_verified(bh) &&
- !ext4_dirent_csum_verify(dir,
- (struct ext4_dir_entry *)bh->b_data)) {
- brelse(bh);
- return -EIO;
- }
- set_buffer_verified(bh);
+ bh = ext4_read_dirblock(dir, block, DIRENT);
+ if (IS_ERR(bh))
+ return PTR_ERR(bh);
de = (struct ext4_dir_entry_2 *) bh->b_data;
top = (struct ext4_dir_entry_2 *) ((char *) de +
@@ -1337,26 +1367,11 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q
return NULL;
do {
block = dx_get_block(frame->at);
- if (!(bh = ext4_bread(NULL, dir, block, 0, err))) {
- if (!(*err)) {
- *err = -EIO;
- ext4_error(dir->i_sb,
- "Directory hole detected on inode %lu\n",
- dir->i_ino);
- }
+ bh = ext4_read_dirblock(dir, block, DIRENT);
+ if (IS_ERR(bh)) {
+ *err = PTR_ERR(bh);
goto errout;
}
-
- if (!buffer_verified(bh) &&
- !ext4_dirent_csum_verify(dir,
- (struct ext4_dir_entry *)bh->b_data)) {
- EXT4_ERROR_INODE(dir, "checksumming directory "
- "block %lu", (unsigned long)block);
- brelse(bh);
- *err = -EIO;
- goto errout;
- }
- set_buffer_verified(bh);
retval = search_dirblock(bh, dir, d_name,
block << EXT4_BLOCK_SIZE_BITS(sb),
res_dir);
@@ -1920,22 +1935,10 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
}
blocks = dir->i_size >> sb->s_blocksize_bits;
for (block = 0; block < blocks; block++) {
- if (!(bh = ext4_bread(handle, dir, block, 0, &retval))) {
- if (!retval) {
- retval = -EIO;
- ext4_error(inode->i_sb,
- "Directory hole detected on inode %lu\n",
- inode->i_ino);
- }
- return retval;
- }
- if (!buffer_verified(bh) &&
- !ext4_dirent_csum_verify(dir,
- (struct ext4_dir_entry *)bh->b_data)) {
- brelse(bh);
- return -EIO;
- }
- set_buffer_verified(bh);
+ bh = ext4_read_dirblock(dir, block, DIRENT);
+ if (IS_ERR(bh))
+ return PTR_ERR(bh);
+
retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
if (retval != -ENOSPC) {
brelse(bh);
@@ -1986,22 +1989,13 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry,
return err;
entries = frame->entries;
at = frame->at;
-
- if (!(bh = ext4_bread(handle, dir, dx_get_block(frame->at), 0, &err))) {
- if (!err) {
- err = -EIO;
- ext4_error(dir->i_sb,
- "Directory hole detected on inode %lu\n",
- dir->i_ino);
- }
+ bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT);
+ if (IS_ERR(bh)) {
+ err = PTR_ERR(bh);
+ bh = NULL;
goto cleanup;
}
- if (!buffer_verified(bh) &&
- !ext4_dirent_csum_verify(dir, (struct ext4_dir_entry *)bh->b_data))
- goto journal_error;
- set_buffer_verified(bh);
-
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, bh);
if (err)
@@ -2352,6 +2346,7 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
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;
int err;
@@ -2368,16 +2363,9 @@ static int ext4_init_new_dir(handle_t *handle, struct inode *dir,
goto out;
}
- inode->i_size = EXT4_I(inode)->i_disksize = blocksize;
- if (!(dir_block = ext4_bread(handle, inode, 0, 1, &err))) {
- if (!err) {
- err = -EIO;
- ext4_error(inode->i_sb,
- "Directory hole detected on inode %lu\n",
- inode->i_ino);
- }
+ inode->i_size = 0;
+ if (!(dir_block = ext4_append(handle, inode, &block, &err)))
goto out;
- }
BUFFER_TRACE(dir_block, "get_write_access");
err = ext4_journal_get_write_access(handle, dir_block);
if (err)
@@ -2477,26 +2465,14 @@ static int empty_dir(struct inode *inode)
}
sb = inode->i_sb;
- if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2) ||
- !(bh = ext4_bread(NULL, inode, 0, 0, &err))) {
- if (err)
- EXT4_ERROR_INODE(inode,
- "error %d reading directory lblock 0", err);
- else
- ext4_warning(inode->i_sb,
- "bad directory (dir #%lu) - no data block",
- inode->i_ino);
+ if (inode->i_size < EXT4_DIR_REC_LEN(1) + EXT4_DIR_REC_LEN(2)) {
+ EXT4_ERROR_INODE(inode, "invalid size");
return 1;
}
- if (!buffer_verified(bh) &&
- !ext4_dirent_csum_verify(inode,
- (struct ext4_dir_entry *)bh->b_data)) {
- EXT4_ERROR_INODE(inode, "checksum error reading directory "
- "lblock 0");
- brelse(bh);
- return -EIO;
- }
- set_buffer_verified(bh);
+ bh = ext4_read_dirblock(inode, 0, EITHER);
+ if (IS_ERR(bh))
+ return 1;
+
de = (struct ext4_dir_entry_2 *) bh->b_data;
de1 = ext4_next_entry(de, sb->s_blocksize);
if (le32_to_cpu(de->inode) != inode->i_ino ||
@@ -2519,29 +2495,9 @@ static int empty_dir(struct inode *inode)
err = 0;
brelse(bh);
lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
- bh = ext4_bread(NULL, inode, lblock, 0, &err);
- if (!bh) {
- if (err)
- EXT4_ERROR_INODE(inode,
- "error %d reading directory "
- "lblock %u", err, lblock);
- else
- ext4_warning(inode->i_sb,
- "bad directory (dir #%lu) - no data block",
- inode->i_ino);
-
- offset += sb->s_blocksize;
- continue;
- }
- if (!buffer_verified(bh) &&
- !ext4_dirent_csum_verify(inode,
- (struct ext4_dir_entry *)bh->b_data)) {
- EXT4_ERROR_INODE(inode, "checksum error "
- "reading directory lblock 0");
- brelse(bh);
- return -EIO;
- }
- set_buffer_verified(bh);
+ bh = ext4_read_dirblock(inode, lblock, EITHER);
+ if (IS_ERR(bh))
+ return 1;
de = (struct ext4_dir_entry_2 *) bh->b_data;
}
if (ext4_check_dir_entry(inode, NULL, de, bh,
@@ -3004,13 +2960,9 @@ static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
struct buffer_head *bh;
if (!ext4_has_inline_data(inode)) {
- if (!(bh = ext4_bread(handle, inode, 0, 0, retval))) {
- if (!*retval) {
- *retval = -EIO;
- ext4_error(inode->i_sb,
- "Directory hole detected on inode %lu\n",
- inode->i_ino);
- }
+ bh = ext4_read_dirblock(inode, 0, EITHER);
+ if (IS_ERR(bh)) {
+ *retval = PTR_ERR(bh);
return NULL;
}
*parent_de = ext4_next_entry(
@@ -3089,11 +3041,6 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
&inlined);
if (!dir_bh)
goto end_rename;
- if (!inlined && !buffer_verified(dir_bh) &&
- !ext4_dirent_csum_verify(old_inode,
- (struct ext4_dir_entry *)dir_bh->b_data))
- goto end_rename;
- set_buffer_verified(dir_bh);
if (le32_to_cpu(parent_de->inode) != old_dir->i_ino)
goto end_rename;
retval = -EMLINK;
generated by cgit v1.2.3 (git 2.0.4) at 2024-07-08 01:11:16 +0000