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Diffstat (limited to 'fs/ext4/namei.c')
-rw-r--r--fs/ext4/namei.c79
1 files changed, 43 insertions, 36 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index e9712e64ec8f..d83f91b62317 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -346,11 +346,10 @@ static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
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);
__u32 csum;
- csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
+ csum = ext4_chksum(ei->i_csum_seed, (__u8 *)dirent, size);
return cpu_to_le32(csum);
}
@@ -442,7 +441,6 @@ static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
int count_offset, int count, struct dx_tail *t)
{
- struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
struct ext4_inode_info *ei = EXT4_I(inode);
__u32 csum;
int size;
@@ -450,9 +448,9 @@ static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
int offset = offsetof(struct dx_tail, dt_checksum);
size = count_offset + (count * sizeof(struct dx_entry));
- csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
- csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
- csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
+ csum = ext4_chksum(ei->i_csum_seed, (__u8 *)dirent, size);
+ csum = ext4_chksum(csum, (__u8 *)t, offset);
+ csum = ext4_chksum(csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
return cpu_to_le32(csum);
}
@@ -2917,33 +2915,50 @@ err_unlock_inode:
return err;
}
-struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
- struct ext4_dir_entry_2 *de,
- int blocksize, int csum_size,
- unsigned int parent_ino, int dotdot_real_len)
+int ext4_init_dirblock(handle_t *handle, struct inode *inode,
+ struct buffer_head *bh, unsigned int parent_ino,
+ void *inline_buf, int inline_size)
{
+ struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *) bh->b_data;
+ size_t blocksize = bh->b_size;
+ int csum_size = 0, header_size;
+
+ if (ext4_has_feature_metadata_csum(inode->i_sb))
+ csum_size = sizeof(struct ext4_dir_entry_tail);
+
de->inode = cpu_to_le32(inode->i_ino);
de->name_len = 1;
de->rec_len = ext4_rec_len_to_disk(ext4_dir_rec_len(de->name_len, NULL),
blocksize);
- strcpy(de->name, ".");
+ memcpy(de->name, ".", 2);
ext4_set_de_type(inode->i_sb, de, S_IFDIR);
de = ext4_next_entry(de, blocksize);
de->inode = cpu_to_le32(parent_ino);
de->name_len = 2;
- if (!dotdot_real_len)
- de->rec_len = ext4_rec_len_to_disk(blocksize -
- (csum_size + ext4_dir_rec_len(1, NULL)),
- blocksize);
- else
+ memcpy(de->name, "..", 3);
+ ext4_set_de_type(inode->i_sb, de, S_IFDIR);
+ if (inline_buf) {
de->rec_len = ext4_rec_len_to_disk(
ext4_dir_rec_len(de->name_len, NULL),
blocksize);
- strcpy(de->name, "..");
- ext4_set_de_type(inode->i_sb, de, S_IFDIR);
+ de = ext4_next_entry(de, blocksize);
+ header_size = (char *)de - bh->b_data;
+ memcpy((void *)de, inline_buf, inline_size);
+ ext4_update_final_de(bh->b_data, inline_size + header_size,
+ blocksize - csum_size);
+ } else {
+ de->rec_len = ext4_rec_len_to_disk(blocksize -
+ (csum_size + ext4_dir_rec_len(1, NULL)),
+ blocksize);
+ }
- return ext4_next_entry(de, blocksize);
+ if (csum_size)
+ ext4_initialize_dirent_tail(bh, blocksize);
+ BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
+ set_buffer_uptodate(bh);
+ set_buffer_verified(bh);
+ return ext4_handle_dirty_dirblock(handle, inode, bh);
}
int ext4_init_new_dir(handle_t *handle, struct inode *dir,
@@ -2952,13 +2967,8 @@ int ext4_init_new_dir(handle_t *handle, struct inode *dir,
struct buffer_head *dir_block = NULL;
struct ext4_dir_entry_2 *de;
ext4_lblk_t block = 0;
- unsigned int blocksize = dir->i_sb->s_blocksize;
- int csum_size = 0;
int err;
- if (ext4_has_feature_metadata_csum(dir->i_sb))
- csum_size = sizeof(struct ext4_dir_entry_tail);
-
if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
err = ext4_try_create_inline_dir(handle, dir, inode);
if (err < 0 && err != -ENOSPC)
@@ -2967,21 +2977,15 @@ int ext4_init_new_dir(handle_t *handle, struct inode *dir,
goto out;
}
+ set_nlink(inode, 2);
inode->i_size = 0;
dir_block = ext4_append(handle, inode, &block);
if (IS_ERR(dir_block))
return PTR_ERR(dir_block);
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)
- ext4_initialize_dirent_tail(dir_block, blocksize);
-
- BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
- err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
+ err = ext4_init_dirblock(handle, inode, dir_block, dir->i_ino, NULL, 0);
if (err)
goto out;
- set_buffer_verified(dir_block);
out:
brelse(dir_block);
return err;
@@ -3084,7 +3088,8 @@ bool ext4_empty_dir(struct inode *inode)
de = (struct ext4_dir_entry_2 *) bh->b_data;
if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size,
0) ||
- le32_to_cpu(de->inode) != inode->i_ino || strcmp(".", de->name)) {
+ le32_to_cpu(de->inode) != inode->i_ino || de->name_len != 1 ||
+ de->name[0] != '.') {
ext4_warning_inode(inode, "directory missing '.'");
brelse(bh);
return false;
@@ -3093,7 +3098,8 @@ bool ext4_empty_dir(struct inode *inode)
de = ext4_next_entry(de, sb->s_blocksize);
if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size,
offset) ||
- le32_to_cpu(de->inode) == 0 || strcmp("..", de->name)) {
+ le32_to_cpu(de->inode) == 0 || de->name_len != 2 ||
+ de->name[0] != '.' || de->name[1] != '.') {
ext4_warning_inode(inode, "directory missing '..'");
brelse(bh);
return false;
@@ -3534,7 +3540,7 @@ static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data,
bh->b_size, 0) ||
le32_to_cpu(de->inode) != inode->i_ino ||
- strcmp(".", de->name)) {
+ de->name_len != 1 || de->name[0] != '.') {
EXT4_ERROR_INODE(inode, "directory missing '.'");
brelse(bh);
*retval = -EFSCORRUPTED;
@@ -3545,7 +3551,8 @@ static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
de = ext4_next_entry(de, inode->i_sb->s_blocksize);
if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data,
bh->b_size, offset) ||
- le32_to_cpu(de->inode) == 0 || strcmp("..", de->name)) {
+ le32_to_cpu(de->inode) == 0 || de->name_len != 2 ||
+ de->name[0] != '.' || de->name[1] != '.') {
EXT4_ERROR_INODE(inode, "directory missing '..'");
brelse(bh);
*retval = -EFSCORRUPTED;
generated by cgit (git 2.34.1) at 2025-08-01 21:48:36 +0000