From: Yang Sheng <yang.sheng@xxxxxxxxx>
Removes static definition of dx_root struct. so that "." and ".." dirent
can have extra data. This patch does not change any functionality but is
required for ext4_data_in_dirent patch.
Signed-off-by: Yang Sheng <yang.sheng@xxxxxxxxx>
Signed-off-by: Artem Blagodarenko <artem.blagodarenko@xxxxxxxxx>
---
fs/ext4/namei.c | 125 ++++++++++++++++++++++++++++++--------------------------
1 file changed, 68 insertions(+), 57 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index c1cf020d1889..0cb6a061aff6 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -193,23 +193,13 @@ struct dx_entry
* dirent the two low bits of the hash version will be zero. Therefore, the
* hash version mod 4 should never be 0. Sincerely, the paranoia department.
*/
-
-struct dx_root
+struct dx_root_info
{
- struct fake_dirent dot;
- char dot_name[4];
- struct fake_dirent dotdot;
- char dotdot_name[4];
- struct dx_root_info
- {
- __le32 reserved_zero;
- u8 hash_version;
- u8 info_length; /* 8 */
- u8 indirect_levels;
- u8 unused_flags;
- }
- info;
- struct dx_entry entries[0];
+ __le32 reserved_zero;
+ u8 hash_version;
+ u8 info_length; /* 8 */
+ u8 indirect_levels;
+ u8 unused_flags;
};
struct dx_node
@@ -521,6 +511,17 @@ static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
entry->block = cpu_to_le32(value);
}
+struct dx_root_info *dx_get_dx_info(struct ext4_dir_entry_2 *de)
+{
+ /* get dotdot first */
+ de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_NAME_LEN(1));
+
+ /* dx root info is after dotdot entry */
+ de = (struct ext4_dir_entry_2 *)((char *)de + EXT4_DIR_NAME_LEN(2));
+
+ return (struct dx_root_info *)de;
+}
+
static inline unsigned dx_get_hash(struct dx_entry *entry)
{
return le32_to_cpu(entry->hash);
@@ -734,7 +735,7 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
{
unsigned count, indirect;
struct dx_entry *at, *entries, *p, *q, *m;
- struct dx_root *root;
+ struct dx_root_info *info;
struct dx_frame *frame = frame_in;
struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
u32 hash;
@@ -744,17 +745,17 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
if (IS_ERR(frame->bh))
return (struct dx_frame *) frame->bh;
- root = (struct dx_root *) frame->bh->b_data;
- if (root->info.hash_version != DX_HASH_TEA &&
- root->info.hash_version != DX_HASH_HALF_MD4 &&
- root->info.hash_version != DX_HASH_LEGACY) {
+ info = dx_get_dx_info((struct ext4_dir_entry_2 *)frame->bh->b_data);
+ if (info->hash_version != DX_HASH_TEA &&
+ info->hash_version != DX_HASH_HALF_MD4 &&
+ info->hash_version != DX_HASH_LEGACY) {
ext4_warning_inode(dir, "Unrecognised inode hash code %u",
- root->info.hash_version);
+ info->hash_version);
goto fail;
}
if (fname)
hinfo = &fname->hinfo;
- hinfo->hash_version = root->info.hash_version;
+ hinfo->hash_version = info->hash_version;
if (hinfo->hash_version <= DX_HASH_TEA)
hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
@@ -762,18 +763,17 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo);
hash = hinfo->hash;
- if (root->info.unused_flags & 1) {
+ if (info->unused_flags & 1) {
ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
- root->info.unused_flags);
+ info->unused_flags);
goto fail;
}
- indirect = root->info.indirect_levels;
+ indirect = info->indirect_levels;
if (indirect >= ext4_dir_htree_level(dir->i_sb)) {
- ext4_warning(dir->i_sb,
- "Directory (ino: %lu) htree depth %#06x exceed"
- "supported value", dir->i_ino,
- ext4_dir_htree_level(dir->i_sb));
+ ext4_warning_inode(dir,
+ "directory htree depth %u exceeds supported value",
+ ext4_dir_htree_level(dir->i_sb));
if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) {
ext4_warning(dir->i_sb, "Enable large directory "
"feature to access it");
@@ -781,14 +781,17 @@ dx_probe(struct ext4_filename *fname, struct inode *dir,
goto fail;
}
- entries = (struct dx_entry *)(((char *)&root->info) +
- root->info.info_length);
+ entries = (struct dx_entry *)(((char *)info) + info->info_length);
- if (dx_get_limit(entries) != dx_root_limit(dir,
- root->info.info_length)) {
+ if (dx_get_limit(entries) !=
+ dx_root_limit(dir, (struct ext4_dir_entry_2 *) frame->bh->b_data,
+ info->info_length)) {
ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
dx_get_limit(entries),
- dx_root_limit(dir, root->info.info_length));
+ dx_root_limit(dir,
+ (struct ext4_dir_entry_2 *)
+ frame->bh->b_data,
+ info->info_length));
goto fail;
}
@@ -872,7 +875,7 @@ static void dx_release(struct dx_frame *frames)
if (frames[0].bh == NULL)
return;
- info = &((struct dx_root *)frames[0].bh->b_data)->info;
+ info = dx_get_dx_info((struct ext4_dir_entry_2 *)frames[0].bh->b_data);
for (i = 0; i <= info->indirect_levels; i++) {
if (frames[i].bh == NULL)
break;
@@ -1907,17 +1910,16 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
struct inode *inode, struct buffer_head *bh)
{
struct buffer_head *bh2;
- struct dx_root *root;
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
struct dx_entry *entries;
- struct ext4_dir_entry_2 *de, *de2;
+ struct ext4_dir_entry_2 *de, *de2, *dot_de, *dotdot_de;
struct ext4_dir_entry_tail *t;
char *data1, *top;
unsigned len;
int retval;
unsigned blocksize;
ext4_lblk_t block;
- struct fake_dirent *fde;
+ struct dx_root_info *dx_info;
int csum_size = 0;
if (ext4_has_metadata_csum(inode->i_sb))
@@ -1932,18 +1934,19 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
brelse(bh);
return retval;
}
- root = (struct dx_root *) bh->b_data;
+
+ dot_de = (struct ext4_dir_entry_2 *)bh->b_data;
+ dotdot_de = ext4_next_entry(dot_de, blocksize);
/* The 0th block becomes the root, move the dirents out */
- fde = &root->dotdot;
- de = (struct ext4_dir_entry_2 *)((char *)fde +
- ext4_rec_len_from_disk(fde->rec_len, blocksize));
- if ((char *) de >= (((char *) root) + blocksize)) {
+ de = (struct ext4_dir_entry_2 *)((char *)dotdot_de +
+ ext4_rec_len_from_disk(dotdot_de->rec_len, blocksize));
+ if ((char *)de >= (((char *)dot_de) + blocksize)) {
EXT4_ERROR_INODE(dir, "invalid rec_len for '..'");
brelse(bh);
return -EFSCORRUPTED;
}
- len = ((char *) root) + (blocksize - csum_size) - (char *) de;
+ len = ((char *)dot_de) + (blocksize - csum_size) - (char *)de;
/* Allocate new block for the 0th block's dirents */
bh2 = ext4_append(handle, dir, &block);
@@ -1969,19 +1972,26 @@ static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
}
/* Initialize the root; the dot dirents already exist */
- de = (struct ext4_dir_entry_2 *) (&root->dotdot);
- de->rec_len = ext4_rec_len_to_disk(blocksize - EXT4_DIR_REC_LEN(2),
- blocksize);
- memset (&root->info, 0, sizeof(root->info));
- root->info.info_length = sizeof(root->info);
- root->info.hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
- entries = root->entries;
+ dotdot_de->rec_len =
+ ext4_rec_len_to_disk(blocksize - le16_to_cpu(dot_de->rec_len),
+ blocksize);
+
+ /* initialize hashing info */
+ dx_info = dx_get_dx_info(dot_de);
+ memset(dx_info, 0, sizeof(*dx_info));
+ dx_info->info_length = sizeof(*dx_info);
+ dx_info->hash_version = EXT4_SB(dir->i_sb)->s_def_hash_version;
+
+ entries = (void *)dx_info + sizeof(*dx_info);
+
dx_set_block(entries, 1);
dx_set_count(entries, 1);
- dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
+ dx_set_limit(entries, dx_root_limit(dir, (struct ext4_dir_entry_2 *)
+ frame->bh->b_data,
+ sizeof(*dx_info)));
/* Initialize as for dx_probe */
- fname->hinfo.hash_version = root->info.hash_version;
+ fname->hinfo.hash_version = dx_info->hash_version;
if (fname->hinfo.hash_version <= DX_HASH_TEA)
fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
@@ -2252,7 +2262,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
goto journal_error;
}
} else {
- struct dx_root *dxroot;
+ struct dx_root_info *info;
memcpy((char *) entries2, (char *) entries,
icount * sizeof(struct dx_entry));
dx_set_limit(entries2, dx_node_limit(dir));
@@ -2260,8 +2270,9 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
/* Set up root */
dx_set_count(entries, 1);
dx_set_block(entries + 0, newblock);
- dxroot = (struct dx_root *)frames[0].bh->b_data;
- dxroot->info.indirect_levels += 1;
+ info = dx_get_dx_info((struct ext4_dir_entry_2 *)
+ frames[0].bh->b_data);
+ info->indirect_levels += 1;
dxtrace(printk(KERN_DEBUG
"Creating %d level index...\n",
info->indirect_levels));
--
2.14.3 (Apple Git-98)
