#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/time.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/quotaops.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/iversion.h>
#include <linux/unicode.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/ext4.h>
#define NAMEI_RA_CHUNKS 2
#define NAMEI_RA_BLOCKS 4
#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
static struct buffer_head *ext4_append(handle_t *handle,
struct inode *inode,
ext4_lblk_t *block)
{
struct ext4_map_blocks map;
struct buffer_head *bh;
int err;
if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
((inode->i_size >> 10) >=
EXT4_SB(inode->i_sb)->s_max_dir_size_kb)))
return ERR_PTR(-ENOSPC);
*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
map.m_lblk = *block;
map.m_len = 1;
err = ext4_map_blocks(NULL, inode, &map, 0);
if (err < 0)
return ERR_PTR(err);
if (err) {
EXT4_ERROR_INODE(inode, "Logical block already allocated");
return ERR_PTR(-EFSCORRUPTED);
}
bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
if (IS_ERR(bh))
return bh;
inode->i_size += inode->i_sb->s_blocksize;
EXT4_I(inode)->i_disksize = inode->i_size;
err = ext4_mark_inode_dirty(handle, inode);
if (err)
goto out;
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, inode->i_sb, bh,
EXT4_JTR_NONE);
if (err)
goto out;
return bh;
out:
brelse(bh);
ext4_std_error(inode->i_sb, err);
return ERR_PTR(err);
}
static int ext4_dx_csum_verify(struct inode *inode,
struct ext4_dir_entry *dirent);
typedef enum {
EITHER, INDEX, DIRENT, DIRENT_HTREE
} dirblock_type_t;
#define ext4_read_dirblock(inode, block, type) \
__ext4_read_dirblock((inode), (block), (type), __func__, __LINE__)
static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
ext4_lblk_t block,
dirblock_type_t type,
const char *func,
unsigned int line)
{
struct buffer_head *bh;
struct ext4_dir_entry *dirent;
int is_dx_block = 0;
if (block >= inode->i_size >> inode->i_blkbits) {
ext4_error_inode(inode, func, line, block,
"Attempting to read directory block (%u) that is past i_size (%llu)",
block, inode->i_size);
return ERR_PTR(-EFSCORRUPTED);
}
if (ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_EIO))
bh = ERR_PTR(-EIO);
else
bh = ext4_bread(NULL, inode, block, 0);
if (IS_ERR(bh)) {
__ext4_warning(inode->i_sb, func, line,
"inode #%lu: lblock %lu: comm %s: "
"error %ld reading directory block",
inode->i_ino, (unsigned long)block,
current->comm, PTR_ERR(bh));
return bh;
}
if (!bh && (type == INDEX || type == DIRENT_HTREE || block == 0)) {
ext4_error_inode(inode, func, line, block,
"Directory hole found for htree %s block %u",
(type == INDEX) ? "index" : "leaf", block);
return ERR_PTR(-EFSCORRUPTED);
}
if (!bh)
return NULL;
dirent = (struct ext4_dir_entry *) bh->b_data;
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");
brelse(bh);
return ERR_PTR(-EFSCORRUPTED);
}
if (!ext4_has_feature_metadata_csum(inode->i_sb) ||
buffer_verified(bh))
return bh;
if (is_dx_block && type == INDEX) {
if (ext4_dx_csum_verify(inode, dirent) &&
!ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
set_buffer_verified(bh);
else {
ext4_error_inode_err(inode, func, line, block,
EFSBADCRC,
"Directory index failed checksum");
brelse(bh);
return ERR_PTR(-EFSBADCRC);
}
}
if (!is_dx_block) {
if (ext4_dirblock_csum_verify(inode, bh) &&
!ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
set_buffer_verified(bh);
else {
ext4_error_inode_err(inode, func, line, block,
EFSBADCRC,
"Directory block failed checksum");
brelse(bh);
return ERR_PTR(-EFSBADCRC);
}
}
return bh;
}
#ifdef DX_DEBUG
#define dxtrace(command) command
#else
#define dxtrace(command)
#endif
struct fake_dirent
{
__le32 inode;
__le16 rec_len;
u8 name_len;
u8 file_type;
};
struct dx_countlimit
{
__le16 limit;
__le16 count;
};
struct dx_entry
{
__le32 hash;
__le32 block;
};
struct dx_root
{
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;
u8 indirect_levels;
u8 unused_flags;
}
info;
struct dx_entry entries[];
};
struct dx_node
{
struct fake_dirent fake;
struct dx_entry entries[];
};
struct dx_frame
{
struct buffer_head *bh;
struct dx_entry *entries;
struct dx_entry *at;
};
struct dx_map_entry
{
u32 hash;
u16 offs;
u16 size;
};
struct dx_tail {
u32 dt_reserved;
__le32 dt_checksum;
};
static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **res_dir);
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
struct inode *dir, struct inode *inode);
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);
t->det_reserved_ft = EXT4_FT_DIR_CSUM;
}
static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
struct buffer_head *bh)
{
struct ext4_dir_entry_tail *t;
int blocksize = EXT4_BLOCK_SIZE(inode->i_sb);
#ifdef PARANOID
struct ext4_dir_entry *d, *top;
d = (struct ext4_dir_entry *)bh->b_data;
top = (struct ext4_dir_entry *)(bh->b_data +
(blocksize - sizeof(struct ext4_dir_entry_tail)));
while (d < top && ext4_rec_len_from_disk(d->rec_len, blocksize))
d = (struct ext4_dir_entry *)(((void *)d) +
ext4_rec_len_from_disk(d->rec_len, blocksize));
if (d != top)
return NULL;
t = (struct ext4_dir_entry_tail *)d;
#else
t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb));
#endif
if (t->det_reserved_zero1 ||
(ext4_rec_len_from_disk(t->det_rec_len, blocksize) !=
sizeof(struct ext4_dir_entry_tail)) ||
t->det_reserved_zero2 ||
t->det_reserved_ft != EXT4_FT_DIR_CSUM)
return NULL;
return t;
}
static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size)
{
struct ext4_inode_info *ei = EXT4_I(inode);
__u32 csum;
csum = ext4_chksum(ei->i_csum_seed, (__u8 *)dirent, size);
return cpu_to_le32(csum);
}
#define warn_no_space_for_csum(inode) \
__warn_no_space_for_csum((inode), __func__, __LINE__)
static void __warn_no_space_for_csum(struct inode *inode, const char *func,
unsigned int line)
{
__ext4_warning_inode(inode, func, line,
"No space for directory leaf checksum. Please run e2fsck -D.");
}
int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh)
{
struct ext4_dir_entry_tail *t;
if (!ext4_has_feature_metadata_csum(inode->i_sb))
return 1;
t = get_dirent_tail(inode, bh);
if (!t) {
warn_no_space_for_csum(inode);
return 0;
}
if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data,
(char *)t - bh->b_data))
return 0;
return 1;
}
static void ext4_dirblock_csum_set(struct inode *inode,
struct buffer_head *bh)
{
struct ext4_dir_entry_tail *t;
if (!ext4_has_feature_metadata_csum(inode->i_sb))
return;
t = get_dirent_tail(inode, bh);
if (!t) {
warn_no_space_for_csum(inode);
return;
}
t->det_checksum = ext4_dirblock_csum(inode, bh->b_data,
(char *)t - bh->b_data);
}
int ext4_handle_dirty_dirblock(handle_t *handle,
struct inode *inode,
struct buffer_head *bh)
{
ext4_dirblock_csum_set(inode, bh);
return ext4_handle_dirty_metadata(handle, inode, bh);
}
static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
struct ext4_dir_entry *dirent,
int *offset)
{
struct ext4_dir_entry *dp;
struct dx_root_info *root;
int count_offset;
int blocksize = EXT4_BLOCK_SIZE(inode->i_sb);
unsigned int rlen = ext4_rec_len_from_disk(dirent->rec_len, blocksize);
if (rlen == blocksize)
count_offset = 8;
else if (rlen == 12) {
dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
if (ext4_rec_len_from_disk(dp->rec_len, blocksize) != blocksize - 12)
return NULL;
root = (struct dx_root_info *)(((void *)dp + 12));
if (root->reserved_zero ||
root->info_length != sizeof(struct dx_root_info))
return NULL;
count_offset = 32;
} else
return NULL;
if (offset)
*offset = count_offset;
return (struct dx_countlimit *)(((void *)dirent) + count_offset);
}
static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
int count_offset, int count, struct dx_tail *t)
{
struct ext4_inode_info *ei = EXT4_I(inode);
__u32 csum;
int size;
__u32 dummy_csum = 0;
int offset = offsetof(struct dx_tail, dt_checksum);
size = count_offset + (count * sizeof(struct dx_entry));
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);
}
static int ext4_dx_csum_verify(struct inode *inode,
struct ext4_dir_entry *dirent)
{
struct dx_countlimit *c;
struct dx_tail *t;
int count_offset, limit, count;
if (!ext4_has_feature_metadata_csum(inode->i_sb))
return 1;
c = get_dx_countlimit(inode, dirent, &count_offset);
if (!c) {
EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
return 0;
}
limit = le16_to_cpu(c->limit);
count = le16_to_cpu(c->count);
if (count_offset + (limit * sizeof(struct dx_entry)) >
EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
warn_no_space_for_csum(inode);
return 0;
}
t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset,
count, t))
return 0;
return 1;
}
static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
{
struct dx_countlimit *c;
struct dx_tail *t;
int count_offset, limit, count;
if (!ext4_has_feature_metadata_csum(inode->i_sb))
return;
c = get_dx_countlimit(inode, dirent, &count_offset);
if (!c) {
EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
return;
}
limit = le16_to_cpu(c->limit);
count = le16_to_cpu(c->count);
if (count_offset + (limit * sizeof(struct dx_entry)) >
EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
warn_no_space_for_csum(inode);
return;
}
t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t);
}
static inline int ext4_handle_dirty_dx_node(handle_t *handle,
struct inode *inode,
struct buffer_head *bh)
{
ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
return ext4_handle_dirty_metadata(handle, inode, bh);
}
static inline struct ext4_dir_entry_2 *
ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
{
return (struct ext4_dir_entry_2 *)((char *)p +
ext4_rec_len_from_disk(p->rec_len, blocksize));
}
static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
{
return le32_to_cpu(entry->block) & 0x0fffffff;
}
static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
{
entry->block = cpu_to_le32(value);
}
static inline unsigned dx_get_hash(struct dx_entry *entry)
{
return le32_to_cpu(entry->hash);
}
static inline void dx_set_hash(struct dx_entry *entry, unsigned value)
{
entry->hash = cpu_to_le32(value);
}
static inline unsigned dx_get_count(struct dx_entry *entries)
{
return le16_to_cpu(((struct dx_countlimit *) entries)->count);
}
static inline unsigned dx_get_limit(struct dx_entry *entries)
{
return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
}
static inline void dx_set_count(struct dx_entry *entries, unsigned value)
{
((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
}
static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
{
((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
}
static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
{
unsigned int entry_space = dir->i_sb->s_blocksize -
ext4_dir_rec_len(1, NULL) -
ext4_dir_rec_len(2, NULL) - infosize;
if (ext4_has_feature_metadata_csum(dir->i_sb))
entry_space -= sizeof(struct dx_tail);
return entry_space / sizeof(struct dx_entry);
}
static inline unsigned dx_node_limit(struct inode *dir)
{
unsigned int entry_space = dir->i_sb->s_blocksize -
ext4_dir_rec_len(0, dir);
if (ext4_has_feature_metadata_csum(dir->i_sb))
entry_space -= sizeof(struct dx_tail);
return entry_space / sizeof(struct dx_entry);
}
#ifdef DX_DEBUG
static void dx_show_index(char * label, struct dx_entry *entries)
{
int i, n = dx_get_count (entries);
printk(KERN_DEBUG "%s index", label);
for (i = 0; i < n; i++) {
printk(KERN_CONT " %x->%lu",
i ? dx_get_hash(entries + i) : 0,
(unsigned long)dx_get_block(entries + i));
}
printk(KERN_CONT "\n");
}
struct stats
{
unsigned names;
unsigned space;
unsigned bcount;
};
static struct stats dx_show_leaf(struct inode *dir,
struct dx_hash_info *hinfo,
struct ext4_dir_entry_2 *de,
int size, int show_names)
{
unsigned names = 0, space = 0;
char *base = (char *) de;
struct dx_hash_info h = *hinfo;
printk("names: ");
while ((char *) de < base + size)
{
if (de->inode)
{
if (show_names)
{
#ifdef CONFIG_FS_ENCRYPTION
int len;
char *name;
struct fscrypt_str fname_crypto_str =
FSTR_INIT(NULL, 0);
int res = 0;
name = de->name;
len = de->name_len;
if (!IS_ENCRYPTED(dir)) {
(void) ext4fs_dirhash(dir, de->name,
de->name_len, &h);
printk("%*.s:(U)%x.%u ", len,
name, h.hash,
(unsigned) ((char *) de
- base));
} else {
struct fscrypt_str de_name =
FSTR_INIT(name, len);
res = fscrypt_fname_alloc_buffer(
len, &fname_crypto_str);
if (res)
printk(KERN_WARNING "Error "
"allocating crypto "
"buffer--skipping "
"crypto\n");
res = fscrypt_fname_disk_to_usr(dir,
0, 0, &de_name,
&fname_crypto_str);
if (res) {
printk(KERN_WARNING "Error "
"converting filename "
"from disk to usr"
"\n");
name = "??";
len = 2;
} else {
name = fname_crypto_str.name;
len = fname_crypto_str.len;
}
if (IS_CASEFOLDED(dir))
h.hash = EXT4_DIRENT_HASH(de);
else
(void) ext4fs_dirhash(dir,
de->name,
de->name_len, &h);
printk("%*.s:(E)%x.%u ", len, name,
h.hash, (unsigned) ((char *) de
- base));
fscrypt_fname_free_buffer(
&fname_crypto_str);
}
#else
int len = de->name_len;
char *name = de->name;
(void) ext4fs_dirhash(dir, de->name,
de->name_len, &h);
printk("%*.s:%x.%u ", len, name, h.hash,
(unsigned) ((char *) de - base));
#endif
}
space += ext4_dir_rec_len(de->name_len, dir);
names++;
}
de = ext4_next_entry(de, size);
}
printk(KERN_CONT "(%i)\n", names);
return (struct stats) { names, space, 1 };
}
struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
struct dx_entry *entries, int levels)
{
unsigned blocksize = dir->i_sb->s_blocksize;
unsigned count = dx_get_count(entries), names = 0, space = 0, i;
unsigned bcount = 0;
struct buffer_head *bh;
printk("%i indexed blocks...\n", count);
for (i = 0; i < count; i++, entries++)
{
ext4_lblk_t block = dx_get_block(entries);
ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
struct stats stats;
printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
bh = ext4_bread(NULL,dir, block, 0);
if (!bh || IS_ERR(bh))
continue;
stats = levels?
dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
bh->b_data, blocksize, 0);
names += stats.names;
space += stats.space;
bcount += stats.bcount;
brelse(bh);
}
if (bcount)
printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n",
levels ? "" : " ", names, space/bcount,
(space/bcount)*100/blocksize);
return (struct stats) { names, space, bcount};
}
static inline void htree_rep_invariant_check(struct dx_entry *at,
struct dx_entry *target,
u32 hash, unsigned int n)
{
while (n--) {
dxtrace(printk(KERN_CONT ","));
if (dx_get_hash(++at) > hash) {
at--;
break;
}
}
ASSERT(at == target - 1);
}
#else
static inline void htree_rep_invariant_check(struct dx_entry *at,
struct dx_entry *target,
u32 hash, unsigned int n)
{
}
#endif
static struct dx_frame *
dx_probe(struct ext4_filename *fname, struct inode *dir,
struct dx_hash_info *hinfo, struct dx_frame *frame_in)
{
unsigned count, indirect, level, i;
struct dx_entry *at, *entries, *p, *q, *m;
struct dx_root *root;
struct dx_frame *frame = frame_in;
struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
u32 hash;
ext4_lblk_t block;
ext4_lblk_t blocks[EXT4_HTREE_LEVEL];
memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0]));
frame->bh = ext4_read_dirblock(dir, 0, INDEX);
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 &&
root->info.hash_version != DX_HASH_SIPHASH) {
ext4_warning_inode(dir, "Unrecognised inode hash code %u",
root->info.hash_version);
goto fail;
}
if (ext4_hash_in_dirent(dir)) {
if (root->info.hash_version != DX_HASH_SIPHASH) {
ext4_warning_inode(dir,
"Hash in dirent, but hash is not SIPHASH");
goto fail;
}
} else {
if (root->info.hash_version == DX_HASH_SIPHASH) {
ext4_warning_inode(dir,
"Hash code is SIPHASH, but hash not in dirent");
goto fail;
}
}
if (fname)
hinfo = &fname->hinfo;
hinfo->hash_version = root->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;
if (fname && fname_name(fname) &&
!(IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir))) {
int ret = ext4fs_dirhash(dir, fname_name(fname),
fname_len(fname), hinfo);
if (ret < 0) {
ret_err = ERR_PTR(ret);
goto fail;
}
}
hash = hinfo->hash;
if (root->info.unused_flags & 1) {
ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
root->info.unused_flags);
goto fail;
}
indirect = root->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));
if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) {
ext4_warning(dir->i_sb, "Enable large directory "
"feature to access it");
}
goto fail;
}
entries = (struct dx_entry *)(((char *)&root->info) +
root->info.info_length);
if (dx_get_limit(entries) != dx_root_limit(dir,
root->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));
goto fail;
}
dxtrace(printk("Look up %x", hash));
level = 0;
blocks[0] = 0;
while (1) {
count = dx_get_count(entries);
if (!count || count > dx_get_limit(entries)) {
ext4_warning_inode(dir,
"dx entry: count %u beyond limit %u",
count, dx_get_limit(entries));
goto fail;
}
p = entries + 1;
q = entries + count - 1;
while (p <= q) {
m = p + (q - p) / 2;
dxtrace(printk(KERN_CONT "."));
if (dx_get_hash(m) > hash)
q = m - 1;
else
p = m + 1;
}
htree_rep_invariant_check(entries, p, hash, count - 1);
at = p - 1;
dxtrace(printk(KERN_CONT " %x->%u\n",
at == entries ? 0 : dx_get_hash(at),
dx_get_block(at)));
frame->entries = entries;
frame->at = at;
block = dx_get_block(at);
for (i = 0; i <= level; i++) {
if (blocks[i] == block) {
ext4_warning_inode(dir,
"dx entry: tree cycle block %u points back to block %u",
blocks[level], block);
goto fail;
}
}
if (++level > indirect)
return frame;
blocks[level] = block;
frame++;
frame->bh = ext4_read_dirblock(dir, block, INDEX);
if (IS_ERR(frame->bh)) {
ret_err = (struct dx_frame *) frame->bh;
frame->bh = NULL;
goto fail;
}
entries = ((struct dx_node *) frame->bh->b_data)->entries;
if (dx_get_limit(entries) != dx_node_limit(dir)) {
ext4_warning_inode(dir,
"dx entry: limit %u != node limit %u",
dx_get_limit(entries), dx_node_limit(dir));
goto fail;
}
}
fail:
while (frame >= frame_in) {
brelse(frame->bh);
frame--;
}
if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
ext4_warning_inode(dir,
"Corrupt directory, running e2fsck is recommended");
return ret_err;
}
static void dx_release(struct dx_frame *frames)
{
struct dx_root_info *info;
int i;
unsigned int indirect_levels;
if (frames[0].bh == NULL)
return;
info = &((struct dx_root *)frames[0].bh->b_data)->info;
indirect_levels = info->indirect_levels;
for (i = 0; i <= indirect_levels; i++) {
if (frames[i].bh == NULL)
break;
brelse(frames[i].bh);
frames[i].bh = NULL;
}
}
static int ext4_htree_next_block(struct inode *dir, __u32 hash,
struct dx_frame *frame,
struct dx_frame *frames,
__u32 *start_hash)
{
struct dx_frame *p;
struct buffer_head *bh;
int num_frames = 0;
__u32 bhash;
p = frame;
while (1) {
if (++(p->at) < p->entries + dx_get_count(p->entries))
break;
if (p == frames)
return 0;
num_frames++;
p--;
}
bhash = dx_get_hash(p->at);
if (start_hash)
*start_hash = bhash;
if ((hash & 1) == 0) {
if ((bhash & ~1) != hash)
return 0;
}
while (num_frames--) {
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;
p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
}
return 1;
}
static int htree_dirblock_to_tree(struct file *dir_file,
struct inode *dir, ext4_lblk_t block,
struct dx_hash_info *hinfo,
__u32 start_hash, __u32 start_minor_hash)
{
struct buffer_head *bh;
struct ext4_dir_entry_2 *de, *top;
int err = 0, count = 0;
struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
int csum = ext4_has_feature_metadata_csum(dir->i_sb);
dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
(unsigned long)block));
bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
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 +
dir->i_sb->s_blocksize -
ext4_dir_rec_len(0,
csum ? NULL : dir));
if (IS_ENCRYPTED(dir)) {
err = fscrypt_prepare_readdir(dir);
if (err < 0) {
brelse(bh);
return err;
}
err = fscrypt_fname_alloc_buffer(EXT4_NAME_LEN,
&fname_crypto_str);
if (err < 0) {
brelse(bh);
return err;
}
}
for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
if (ext4_check_dir_entry(dir, NULL, de, bh,
bh->b_data, bh->b_size,
EXT4_LBLK_TO_B(dir, block)
+ ((char *)de - bh->b_data))) {
break;
}
if (ext4_hash_in_dirent(dir)) {
if (de->name_len && de->inode) {
hinfo->hash = EXT4_DIRENT_HASH(de);
hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
} else {
hinfo->hash = 0;
hinfo->minor_hash = 0;
}
} else {
err = ext4fs_dirhash(dir, de->name,
de->name_len, hinfo);
if (err < 0) {
count = err;
goto errout;
}
}
if ((hinfo->hash < start_hash) ||
((hinfo->hash == start_hash) &&
(hinfo->minor_hash < start_minor_hash)))
continue;
if (de->inode == 0)
continue;
if (!IS_ENCRYPTED(dir)) {
tmp_str.name = de->name;
tmp_str.len = de->name_len;
err = ext4_htree_store_dirent(dir_file,
hinfo->hash, hinfo->minor_hash, de,
&tmp_str);
} else {
int save_len = fname_crypto_str.len;
struct fscrypt_str de_name = FSTR_INIT(de->name,
de->name_len);
err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
hinfo->minor_hash, &de_name,
&fname_crypto_str);
if (err) {
count = err;
goto errout;
}
err = ext4_htree_store_dirent(dir_file,
hinfo->hash, hinfo->minor_hash, de,
&fname_crypto_str);
fname_crypto_str.len = save_len;
}
if (err != 0) {
count = err;
goto errout;
}
count++;
}
errout:
brelse(bh);
fscrypt_fname_free_buffer(&fname_crypto_str);
return count;
}
int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
__u32 start_minor_hash, __u32 *next_hash)
{
struct dx_hash_info hinfo;
struct ext4_dir_entry_2 *de;
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
struct inode *dir;
ext4_lblk_t block;
int count = 0;
int ret, err;
__u32 hashval;
struct fscrypt_str tmp_str;
dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
start_hash, start_minor_hash));
dir = file_inode(dir_file);
if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) {
if (ext4_hash_in_dirent(dir))
hinfo.hash_version = DX_HASH_SIPHASH;
else
hinfo.hash_version =
EXT4_SB(dir->i_sb)->s_def_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;
if (ext4_has_inline_data(dir)) {
int has_inline_data = 1;
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;
}
}
count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
start_hash, start_minor_hash);
*next_hash = ~0;
return count;
}
hinfo.hash = start_hash;
hinfo.minor_hash = 0;
frame = dx_probe(NULL, dir, &hinfo, frames);
if (IS_ERR(frame))
return PTR_ERR(frame);
if (!start_hash && !start_minor_hash) {
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
tmp_str.name = de->name;
tmp_str.len = de->name_len;
err = ext4_htree_store_dirent(dir_file, 0, 0,
de, &tmp_str);
if (err != 0)
goto errout;
count++;
}
if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
de = ext4_next_entry(de, dir->i_sb->s_blocksize);
tmp_str.name = de->name;
tmp_str.len = de->name_len;
err = ext4_htree_store_dirent(dir_file, 2, 0,
de, &tmp_str);
if (err != 0)
goto errout;
count++;
}
while (1) {
if (fatal_signal_pending(current)) {
err = -ERESTARTSYS;
goto errout;
}
cond_resched();
block = dx_get_block(frame->at);
ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
start_hash, start_minor_hash);
if (ret < 0) {
err = ret;
goto errout;
}
count += ret;
hashval = ~0;
ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
frame, frames, &hashval);
*next_hash = hashval;
if (ret < 0) {
err = ret;
goto errout;
}
if ((ret == 0) ||
(count && ((hashval & 1) == 0)))
break;
}
dx_release(frames);
dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
"next hash: %x\n", count, *next_hash));
return count;
errout:
dx_release(frames);
return (err);
}
static inline int search_dirblock(struct buffer_head *bh,
struct inode *dir,
struct ext4_filename *fname,
unsigned int offset,
struct ext4_dir_entry_2 **res_dir)
{
return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir,
fname, offset, res_dir);
}
static int dx_make_map(struct inode *dir, struct buffer_head *bh,
struct dx_hash_info *hinfo,
struct dx_map_entry *map_tail)
{
int count = 0;
struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)bh->b_data;
unsigned int buflen = bh->b_size;
char *base = bh->b_data;
struct dx_hash_info h = *hinfo;
int blocksize = EXT4_BLOCK_SIZE(dir->i_sb);
if (ext4_has_feature_metadata_csum(dir->i_sb))
buflen -= sizeof(struct ext4_dir_entry_tail);
while ((char *) de < base + buflen) {
if (ext4_check_dir_entry(dir, NULL, de, bh, base, buflen,
((char *)de) - base))
return -EFSCORRUPTED;
if (de->name_len && de->inode) {
if (ext4_hash_in_dirent(dir))
h.hash = EXT4_DIRENT_HASH(de);
else {
int err = ext4fs_dirhash(dir, de->name,
de->name_len, &h);
if (err < 0)
return err;
}
map_tail--;
map_tail->hash = h.hash;
map_tail->offs = ((char *) de - base)>>2;
map_tail->size = ext4_rec_len_from_disk(de->rec_len,
blocksize);
count++;
cond_resched();
}
de = ext4_next_entry(de, blocksize);
}
return count;
}
static void dx_sort_map (struct dx_map_entry *map, unsigned count)
{
struct dx_map_entry *p, *q, *top = map + count - 1;
int more;
while (count > 2) {
count = count*10/13;
if (count - 9 < 2)
count = 11;
for (p = top, q = p - count; q >= map; p--, q--)
if (p->hash < q->hash)
swap(*p, *q);
}
do {
more = 0;
q = top;
while (q-- > map) {
if (q[1].hash >= q[0].hash)
continue;
swap(*(q+1), *q);
more = 1;
}
} while(more);
}
static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
{
struct dx_entry *entries = frame->entries;
struct dx_entry *old = frame->at, *new = old + 1;
int count = dx_get_count(entries);
ASSERT(count < dx_get_limit(entries));
ASSERT(old < entries + count);
memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
dx_set_hash(new, hash);
dx_set_block(new, block);
dx_set_count(entries, count + 1);
}
#if IS_ENABLED(CONFIG_UNICODE)
int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
struct ext4_filename *name)
{
struct qstr *cf_name = &name->cf_name;
unsigned char *buf;
struct dx_hash_info *hinfo = &name->hinfo;
int len;
if (!IS_CASEFOLDED(dir) ||
(IS_ENCRYPTED(dir) && !fscrypt_has_encryption_key(dir))) {
cf_name->name = NULL;
return 0;
}
buf = kmalloc(EXT4_NAME_LEN, GFP_NOFS);
if (!buf)
return -ENOMEM;
len = utf8_casefold(dir->i_sb->s_encoding, iname, buf, EXT4_NAME_LEN);
if (len <= 0) {
kfree(buf);
buf = NULL;
}
cf_name->name = buf;
cf_name->len = (unsigned) len;
if (!IS_ENCRYPTED(dir))
return 0;
hinfo->hash_version = DX_HASH_SIPHASH;
hinfo->seed = NULL;
if (cf_name->name)
return ext4fs_dirhash(dir, cf_name->name, cf_name->len, hinfo);
else
return ext4fs_dirhash(dir, iname->name, iname->len, hinfo);
}
#endif
static bool ext4_match(struct inode *parent,
const struct ext4_filename *fname,
struct ext4_dir_entry_2 *de)
{
struct fscrypt_name f;
if (!de->inode)
return false;
f.usr_fname = fname->usr_fname;
f.disk_name = fname->disk_name;
#ifdef CONFIG_FS_ENCRYPTION
f.crypto_buf = fname->crypto_buf;
#endif
#if IS_ENABLED(CONFIG_UNICODE)
if (IS_CASEFOLDED(parent) &&
(!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) {
if (sb_no_casefold_compat_fallback(parent->i_sb) &&
IS_ENCRYPTED(parent) && fname->cf_name.name &&
(fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
fname->hinfo.minor_hash != EXT4_DIRENT_MINOR_HASH(de)))
return false;
return generic_ci_match(parent, fname->usr_fname,
&fname->cf_name, de->name,
de->name_len) > 0;
}
#endif
return fscrypt_match_name(&f, de->name, de->name_len);
}
int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
struct inode *dir, struct ext4_filename *fname,
unsigned int offset, struct ext4_dir_entry_2 **res_dir)
{
struct ext4_dir_entry_2 * de;
char * dlimit;
int de_len;
de = (struct ext4_dir_entry_2 *)search_buf;
dlimit = search_buf + buf_size;
while ((char *) de < dlimit - EXT4_BASE_DIR_LEN) {
if (de->name + de->name_len <= dlimit &&
ext4_match(dir, fname, de)) {
if (ext4_check_dir_entry(dir, NULL, de, bh, search_buf,
buf_size, offset))
return -EFSCORRUPTED;
*res_dir = de;
return 1;
}
de_len = ext4_rec_len_from_disk(de->rec_len,
dir->i_sb->s_blocksize);
if (de_len <= 0)
return -EFSCORRUPTED;
offset += de_len;
de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
}
return 0;
}
static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
struct ext4_dir_entry *de)
{
struct super_block *sb = dir->i_sb;
if (!is_dx(dir))
return 0;
if (block == 0)
return 1;
if (de->inode == 0 &&
ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) ==
sb->s_blocksize)
return 1;
return 0;
}
static struct buffer_head *__ext4_find_entry(struct inode *dir,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **res_dir,
int *inlined)
{
struct super_block *sb;
struct buffer_head *bh_use[NAMEI_RA_SIZE];
struct buffer_head *bh, *ret = NULL;
ext4_lblk_t start, block;
const u8 *name = fname->usr_fname->name;
size_t ra_max = 0;
size_t ra_ptr = 0;
ext4_lblk_t nblocks;
int i, namelen, retval;
*res_dir = NULL;
sb = dir->i_sb;
namelen = fname->usr_fname->len;
if (namelen > EXT4_NAME_LEN)
return NULL;
if (ext4_has_inline_data(dir)) {
int has_inline_data = 1;
ret = ext4_find_inline_entry(dir, fname, res_dir,
&has_inline_data);
if (inlined)
*inlined = has_inline_data;
if (has_inline_data || IS_ERR(ret))
goto cleanup_and_exit;
}
if ((namelen <= 2) && (name[0] == '.') &&
(name[1] == '.' || name[1] == '\0')) {
block = start = 0;
nblocks = 1;
goto restart;
}
if (is_dx(dir)) {
ret = ext4_dx_find_entry(dir, fname, res_dir);
if (IS_ERR(ret) && PTR_ERR(ret) == ERR_BAD_DX_DIR)
dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
"falling back\n"));
else if (!sb_no_casefold_compat_fallback(dir->i_sb) &&
*res_dir == NULL && IS_CASEFOLDED(dir))
dxtrace(printk(KERN_DEBUG "ext4_find_entry: casefold "
"failed, falling back\n"));
else
goto cleanup_and_exit;
ret = NULL;
}
nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
if (!nblocks) {
ret = NULL;
goto cleanup_and_exit;
}
start = EXT4_I(dir)->i_dir_start_lookup;
if (start >= nblocks)
start = 0;
block = start;
restart:
do {
cond_resched();
if (ra_ptr >= ra_max) {
ra_ptr = 0;
if (block < start)
ra_max = start - block;
else
ra_max = nblocks - block;
ra_max = min(ra_max, ARRAY_SIZE(bh_use));
retval = ext4_bread_batch(dir, block, ra_max,
false , bh_use);
if (retval) {
ret = ERR_PTR(retval);
ra_max = 0;
goto cleanup_and_exit;
}
}
if ((bh = bh_use[ra_ptr++]) == NULL)
goto next;
wait_on_buffer(bh);
if (!buffer_uptodate(bh)) {
EXT4_ERROR_INODE_ERR(dir, EIO,
"reading directory lblock %lu",
(unsigned long) block);
brelse(bh);
ret = ERR_PTR(-EIO);
goto cleanup_and_exit;
}
if (!buffer_verified(bh) &&
!is_dx_internal_node(dir, block,
(struct ext4_dir_entry *)bh->b_data) &&
!ext4_dirblock_csum_verify(dir, bh)) {
EXT4_ERROR_INODE_ERR(dir, EFSBADCRC,
"checksumming directory "
"block %lu", (unsigned long)block);
brelse(bh);
ret = ERR_PTR(-EFSBADCRC);
goto cleanup_and_exit;
}
set_buffer_verified(bh);
i = search_dirblock(bh, dir, fname,
EXT4_LBLK_TO_B(dir, block), res_dir);
if (i == 1) {
EXT4_I(dir)->i_dir_start_lookup = block;
ret = bh;
goto cleanup_and_exit;
} else {
brelse(bh);
if (i < 0) {
ret = ERR_PTR(i);
goto cleanup_and_exit;
}
}
next:
if (++block >= nblocks)
block = 0;
} while (block != start);
block = nblocks;
nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
if (block < nblocks) {
start = 0;
goto restart;
}
cleanup_and_exit:
for (; ra_ptr < ra_max; ra_ptr++)
brelse(bh_use[ra_ptr]);
return ret;
}
static struct buffer_head *ext4_find_entry(struct inode *dir,
const struct qstr *d_name,
struct ext4_dir_entry_2 **res_dir,
int *inlined)
{
int err;
struct ext4_filename fname;
struct buffer_head *bh;
err = ext4_fname_setup_filename(dir, d_name, 1, &fname);
if (err == -ENOENT)
return NULL;
if (err)
return ERR_PTR(err);
bh = __ext4_find_entry(dir, &fname, res_dir, inlined);
ext4_fname_free_filename(&fname);
return bh;
}
static struct buffer_head *ext4_lookup_entry(struct inode *dir,
struct dentry *dentry,
struct ext4_dir_entry_2 **res_dir)
{
int err;
struct ext4_filename fname;
struct buffer_head *bh;
err = ext4_fname_prepare_lookup(dir, dentry, &fname);
if (err == -ENOENT)
return NULL;
if (err)
return ERR_PTR(err);
bh = __ext4_find_entry(dir, &fname, res_dir, NULL);
ext4_fname_free_filename(&fname);
return bh;
}
static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **res_dir)
{
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
struct buffer_head *bh;
ext4_lblk_t block;
int retval;
#ifdef CONFIG_FS_ENCRYPTION
*res_dir = NULL;
#endif
frame = dx_probe(fname, dir, NULL, frames);
if (IS_ERR(frame))
return ERR_CAST(frame);
do {
block = dx_get_block(frame->at);
bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
if (IS_ERR(bh))
goto errout;
retval = search_dirblock(bh, dir, fname,
EXT4_LBLK_TO_B(dir, block), res_dir);
if (retval == 1)
goto success;
brelse(bh);
if (retval < 0) {
bh = ERR_PTR(ERR_BAD_DX_DIR);
goto errout;
}
retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame,
frames, NULL);
if (retval < 0) {
ext4_warning_inode(dir,
"error %d reading directory index block",
retval);
bh = ERR_PTR(retval);
goto errout;
}
} while (retval == 1);
bh = NULL;
errout:
dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name));
success:
dx_release(frames);
return bh;
}
static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
struct inode *inode;
struct ext4_dir_entry_2 *de = NULL;
struct buffer_head *bh;
if (dentry->d_name.len > EXT4_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
bh = ext4_lookup_entry(dir, dentry, &de);
if (IS_ERR(bh))
return ERR_CAST(bh);
inode = NULL;
if (bh) {
__u32 ino = le32_to_cpu(de->inode);
brelse(bh);
if (!ext4_valid_inum(dir->i_sb, ino)) {
EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
return ERR_PTR(-EFSCORRUPTED);
}
if (unlikely(ino == dir->i_ino)) {
EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir",
dentry);
return ERR_PTR(-EFSCORRUPTED);
}
inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL);
if (inode == ERR_PTR(-ESTALE)) {
EXT4_ERROR_INODE(dir,
"deleted inode referenced: %u",
ino);
return ERR_PTR(-EFSCORRUPTED);
}
if (!IS_ERR(inode) && IS_ENCRYPTED(dir) &&
(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
!fscrypt_has_permitted_context(dir, inode)) {
ext4_warning(inode->i_sb,
"Inconsistent encryption contexts: %lu/%lu",
dir->i_ino, inode->i_ino);
iput(inode);
return ERR_PTR(-EPERM);
}
}
if (IS_ENABLED(CONFIG_UNICODE) && !inode && IS_CASEFOLDED(dir)) {
return NULL;
}
return d_splice_alias(inode, dentry);
}
struct dentry *ext4_get_parent(struct dentry *child)
{
__u32 ino;
struct ext4_dir_entry_2 * de = NULL;
struct buffer_head *bh;
bh = ext4_find_entry(d_inode(child), &dotdot_name, &de, NULL);
if (IS_ERR(bh))
return ERR_CAST(bh);
if (!bh)
return ERR_PTR(-ENOENT);
ino = le32_to_cpu(de->inode);
brelse(bh);
if (!ext4_valid_inum(child->d_sb, ino)) {
EXT4_ERROR_INODE(d_inode(child),
"bad parent inode number: %u", ino);
return ERR_PTR(-EFSCORRUPTED);
}
return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL));
}
static struct ext4_dir_entry_2 *
dx_move_dirents(struct inode *dir, char *from, char *to,
struct dx_map_entry *map, int count,
unsigned blocksize)
{
unsigned rec_len = 0;
while (count--) {
struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
(from + (map->offs<<2));
rec_len = ext4_dir_rec_len(de->name_len, dir);
memcpy (to, de, rec_len);
((struct ext4_dir_entry_2 *) to)->rec_len =
ext4_rec_len_to_disk(rec_len, blocksize);
de->inode = 0;
memset(&de->name_len, 0, ext4_rec_len_from_disk(de->rec_len,
blocksize) -
offsetof(struct ext4_dir_entry_2,
name_len));
map++;
to += rec_len;
}
return (struct ext4_dir_entry_2 *) (to - rec_len);
}
static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base,
unsigned int blocksize)
{
struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
unsigned rec_len = 0;
prev = to = de;
while ((char*)de < base + blocksize) {
next = ext4_next_entry(de, blocksize);
if (de->inode && de->name_len) {
rec_len = ext4_dir_rec_len(de->name_len, dir);
if (de > to)
memmove(to, de, rec_len);
to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
prev = to;
to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
}
de = next;
}
return prev;
}
static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
struct buffer_head **bh,struct dx_frame *frame,
struct dx_hash_info *hinfo)
{
unsigned blocksize = dir->i_sb->s_blocksize;
unsigned continued;
int count;
struct buffer_head *bh2;
ext4_lblk_t newblock;
u32 hash2;
struct dx_map_entry *map;
char *data1 = (*bh)->b_data, *data2;
unsigned split, move, size;
struct ext4_dir_entry_2 *de = NULL, *de2;
int csum_size = 0;
int err = 0, i;
if (ext4_has_feature_metadata_csum(dir->i_sb))
csum_size = sizeof(struct ext4_dir_entry_tail);
bh2 = ext4_append(handle, dir, &newblock);
if (IS_ERR(bh2)) {
brelse(*bh);
*bh = NULL;
return ERR_CAST(bh2);
}
BUFFER_TRACE(*bh, "get_write_access");
err = ext4_journal_get_write_access(handle, dir->i_sb, *bh,
EXT4_JTR_NONE);
if (err)
goto journal_error;
BUFFER_TRACE(frame->bh, "get_write_access");
err = ext4_journal_get_write_access(handle, dir->i_sb, frame->bh,
EXT4_JTR_NONE);
if (err)
goto journal_error;
data2 = bh2->b_data;
map = (struct dx_map_entry *) (data2 + blocksize);
count = dx_make_map(dir, *bh, hinfo, map);
if (count < 0) {
err = count;
goto journal_error;
}
map -= count;
dx_sort_map(map, count);
size = 0;
move = 0;
for (i = count-1; i >= 0; i--) {
if (size + map[i].size/2 > blocksize/2)
break;
size += map[i].size;
move++;
}
if (i >= 0)
split = count - move;
else
split = count/2;
if (WARN_ON_ONCE(split == 0)) {
ext4_error_inode_block(dir, (*bh)->b_blocknr, 0,
"bad indexed directory? hash=%08x:%08x count=%d move=%u",
hinfo->hash, hinfo->minor_hash, count, move);
err = -EFSCORRUPTED;
goto out;
}
hash2 = map[split].hash;
continued = hash2 == map[split - 1].hash;
dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
(unsigned long)dx_get_block(frame->at),
hash2, split, count-split));
de2 = dx_move_dirents(dir, data1, data2, map + split, count - split,
blocksize);
de = dx_pack_dirents(dir, data1, blocksize);
de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
(char *) de,
blocksize);
de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
(char *) de2,
blocksize);
if (csum_size) {
ext4_initialize_dirent_tail(*bh, blocksize);
ext4_initialize_dirent_tail(bh2, blocksize);
}
dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
blocksize, 1));
dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
blocksize, 1));
if (hinfo->hash >= hash2) {
swap(*bh, bh2);
de = de2;
}
dx_insert_block(frame, hash2 + continued, newblock);
err = ext4_handle_dirty_dirblock(handle, dir, bh2);
if (err)
goto journal_error;
err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
if (err)
goto journal_error;
brelse(bh2);
dxtrace(dx_show_index("frame", frame->entries));
return de;
journal_error:
ext4_std_error(dir->i_sb, err);
out:
brelse(*bh);
brelse(bh2);
*bh = NULL;
return ERR_PTR(err);
}
int ext4_find_dest_de(struct inode *dir, struct buffer_head *bh,
void *buf, int buf_size,
struct ext4_filename *fname,
struct ext4_dir_entry_2 **dest_de)
{
struct ext4_dir_entry_2 *de;
unsigned short reclen = ext4_dir_rec_len(fname_len(fname), dir);
int nlen, rlen;
unsigned int offset = 0;
char *top;
de = buf;
top = buf + buf_size - reclen;
while ((char *) de <= top) {
if (ext4_check_dir_entry(dir, NULL, de, bh,
buf, buf_size, offset))
return -EFSCORRUPTED;
if (ext4_match(dir, fname, de))
return -EEXIST;
nlen = ext4_dir_rec_len(de->name_len, dir);
rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
if ((de->inode ? rlen - nlen : rlen) >= reclen)
break;
de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
offset += rlen;
}
if ((char *) de > top)
return -ENOSPC;
*dest_de = de;
return 0;
}
void ext4_insert_dentry(struct inode *dir,
struct inode *inode,
struct ext4_dir_entry_2 *de,
int buf_size,
struct ext4_filename *fname)
{
int nlen, rlen;
nlen = ext4_dir_rec_len(de->name_len, dir);
rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
if (de->inode) {
struct ext4_dir_entry_2 *de1 =
(struct ext4_dir_entry_2 *)((char *)de + nlen);
de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
de = de1;
}
de->file_type = EXT4_FT_UNKNOWN;
de->inode = cpu_to_le32(inode->i_ino);
ext4_set_de_type(inode->i_sb, de, inode->i_mode);
de->name_len = fname_len(fname);
memcpy(de->name, fname_name(fname), fname_len(fname));
if (ext4_hash_in_dirent(dir)) {
struct dx_hash_info *hinfo = &fname->hinfo;
EXT4_DIRENT_HASHES(de)->hash = cpu_to_le32(hinfo->hash);
EXT4_DIRENT_HASHES(de)->minor_hash =
cpu_to_le32(hinfo->minor_hash);
}
}
static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
struct inode *dir,
struct inode *inode, struct ext4_dir_entry_2 *de,
struct buffer_head *bh)
{
unsigned int blocksize = dir->i_sb->s_blocksize;
int csum_size = 0;
int err, err2;
if (ext4_has_feature_metadata_csum(inode->i_sb))
csum_size = sizeof(struct ext4_dir_entry_tail);
if (!de) {
err = ext4_find_dest_de(dir, bh, bh->b_data,
blocksize - csum_size, fname, &de);
if (err)
return err;
}
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
EXT4_JTR_NONE);
if (err) {
ext4_std_error(dir->i_sb, err);
return err;
}
ext4_insert_dentry(dir, inode, de, blocksize, fname);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
ext4_update_dx_flag(dir);
inode_inc_iversion(dir);
err2 = ext4_mark_inode_dirty(handle, dir);
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
err = ext4_handle_dirty_dirblock(handle, dir, bh);
if (err)
ext4_std_error(dir->i_sb, err);
return err ? err : err2;
}
static bool ext4_check_dx_root(struct inode *dir, struct dx_root *root)
{
struct fake_dirent *fde;
const char *error_msg;
unsigned int rlen;
unsigned int blocksize = dir->i_sb->s_blocksize;
char *blockend = (char *)root + dir->i_sb->s_blocksize;
fde = &root->dot;
if (unlikely(fde->name_len != 1)) {
error_msg = "invalid name_len for '.'";
goto corrupted;
}
if (unlikely(strncmp(root->dot_name, ".", fde->name_len))) {
error_msg = "invalid name for '.'";
goto corrupted;
}
rlen = ext4_rec_len_from_disk(fde->rec_len, blocksize);
if (unlikely((char *)fde + rlen >= blockend)) {
error_msg = "invalid rec_len for '.'";
goto corrupted;
}
fde = &root->dotdot;
if (unlikely(fde->name_len != 2)) {
error_msg = "invalid name_len for '..'";
goto corrupted;
}
if (unlikely(strncmp(root->dotdot_name, "..", fde->name_len))) {
error_msg = "invalid name for '..'";
goto corrupted;
}
rlen = ext4_rec_len_from_disk(fde->rec_len, blocksize);
if (unlikely((char *)fde + rlen >= blockend)) {
error_msg = "invalid rec_len for '..'";
goto corrupted;
}
return true;
corrupted:
EXT4_ERROR_INODE(dir, "Corrupt dir, %s, running e2fsck is recommended",
error_msg);
return false;
}
static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
struct inode *dir,
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;
char *data2, *top;
unsigned len;
int retval;
unsigned blocksize;
ext4_lblk_t block;
struct fake_dirent *fde;
int csum_size = 0;
if (ext4_has_feature_metadata_csum(inode->i_sb))
csum_size = sizeof(struct ext4_dir_entry_tail);
blocksize = dir->i_sb->s_blocksize;
dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
BUFFER_TRACE(bh, "get_write_access");
retval = ext4_journal_get_write_access(handle, dir->i_sb, bh,
EXT4_JTR_NONE);
if (retval) {
ext4_std_error(dir->i_sb, retval);
brelse(bh);
return retval;
}
root = (struct dx_root *) bh->b_data;
if (!ext4_check_dx_root(dir, root)) {
brelse(bh);
return -EFSCORRUPTED;
}
fde = &root->dotdot;
de = (struct ext4_dir_entry_2 *)((char *)fde +
ext4_rec_len_from_disk(fde->rec_len, blocksize));
len = ((char *) root) + (blocksize - csum_size) - (char *) de;
bh2 = ext4_append(handle, dir, &block);
if (IS_ERR(bh2)) {
brelse(bh);
return PTR_ERR(bh2);
}
ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
data2 = bh2->b_data;
memcpy(data2, de, len);
memset(de, 0, len);
de = (struct ext4_dir_entry_2 *) data2;
top = data2 + len;
while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top) {
if (ext4_check_dir_entry(dir, NULL, de, bh2, data2, len,
(char *)de - data2)) {
brelse(bh2);
brelse(bh);
return -EFSCORRUPTED;
}
de = de2;
}
de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
(char *) de, blocksize);
if (csum_size)
ext4_initialize_dirent_tail(bh2, blocksize);
de = (struct ext4_dir_entry_2 *) (&root->dotdot);
de->rec_len = ext4_rec_len_to_disk(
blocksize - ext4_dir_rec_len(2, NULL), blocksize);
memset (&root->info, 0, sizeof(root->info));
root->info.info_length = sizeof(root->info);
if (ext4_hash_in_dirent(dir))
root->info.hash_version = DX_HASH_SIPHASH;
else
root->info.hash_version =
EXT4_SB(dir->i_sb)->s_def_hash_version;
entries = root->entries;
dx_set_block(entries, 1);
dx_set_count(entries, 1);
dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
fname->hinfo.hash_version = root->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;
if (!ext4_hash_in_dirent(dir)) {
int err = ext4fs_dirhash(dir, fname_name(fname),
fname_len(fname), &fname->hinfo);
if (err < 0) {
brelse(bh2);
brelse(bh);
return err;
}
}
memset(frames, 0, sizeof(frames));
frame = frames;
frame->entries = entries;
frame->at = entries;
frame->bh = bh;
retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
if (retval)
goto out_frames;
retval = ext4_handle_dirty_dirblock(handle, dir, bh2);
if (retval)
goto out_frames;
de = do_split(handle,dir, &bh2, frame, &fname->hinfo);
if (IS_ERR(de)) {
retval = PTR_ERR(de);
goto out_frames;
}
retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh2);
out_frames:
if (retval)
ext4_mark_inode_dirty(handle, dir);
dx_release(frames);
brelse(bh2);
return retval;
}
static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
struct inode *inode)
{
struct inode *dir = d_inode(dentry->d_parent);
struct buffer_head *bh = NULL;
struct ext4_dir_entry_2 *de;
struct super_block *sb;
struct ext4_filename fname;
int retval;
int dx_fallback=0;
unsigned blocksize;
ext4_lblk_t block, blocks;
int csum_size = 0;
if (ext4_has_feature_metadata_csum(inode->i_sb))
csum_size = sizeof(struct ext4_dir_entry_tail);
sb = dir->i_sb;
blocksize = sb->s_blocksize;
if (fscrypt_is_nokey_name(dentry))
return -ENOKEY;
if (!generic_ci_validate_strict_name(dir, &dentry->d_name))
return -EINVAL;
retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
if (retval)
return retval;
if (ext4_has_inline_data(dir)) {
retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
if (retval < 0)
goto out;
if (retval == 1) {
retval = 0;
goto out;
}
}
if (is_dx(dir)) {
retval = ext4_dx_add_entry(handle, &fname, dir, inode);
if (!retval || (retval != ERR_BAD_DX_DIR))
goto out;
if (ext4_has_feature_metadata_csum(sb)) {
EXT4_ERROR_INODE(dir,
"Directory has corrupted htree index.");
retval = -EFSCORRUPTED;
goto out;
}
ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
dx_fallback++;
retval = ext4_mark_inode_dirty(handle, dir);
if (unlikely(retval))
goto out;
}
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;
goto out;
}
retval = add_dirent_to_buf(handle, &fname, dir, inode,
NULL, bh);
if (retval != -ENOSPC)
goto out;
if (blocks == 1 && !dx_fallback &&
ext4_has_feature_dir_index(sb)) {
retval = make_indexed_dir(handle, &fname, dir,
inode, bh);
bh = NULL;
goto out;
}
brelse(bh);
}
bh = ext4_append(handle, dir, &block);
add_to_new_block:
if (IS_ERR(bh)) {
retval = PTR_ERR(bh);
bh = NULL;
goto out;
}
de = (struct ext4_dir_entry_2 *) bh->b_data;
de->inode = 0;
de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
if (csum_size)
ext4_initialize_dirent_tail(bh, blocksize);
retval = add_dirent_to_buf(handle, &fname, dir, inode, de, bh);
out:
ext4_fname_free_filename(&fname);
brelse(bh);
if (retval == 0)
ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
return retval;
}
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
struct inode *dir, struct inode *inode)
{
struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
struct dx_entry *entries, *at;
struct buffer_head *bh;
struct super_block *sb = dir->i_sb;
struct ext4_dir_entry_2 *de;
int restart;
int err;
again:
restart = 0;
frame = dx_probe(fname, dir, NULL, frames);
if (IS_ERR(frame))
return PTR_ERR(frame);
entries = frame->entries;
at = frame->at;
bh = ext4_read_dirblock(dir, dx_get_block(frame->at), DIRENT_HTREE);
if (IS_ERR(bh)) {
err = PTR_ERR(bh);
bh = NULL;
goto cleanup;
}
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, sb, bh, EXT4_JTR_NONE);
if (err)
goto journal_error;
err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh);
if (err != -ENOSPC)
goto cleanup;
err = 0;
dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
dx_get_count(entries), dx_get_limit(entries)));
if (dx_get_count(entries) == dx_get_limit(entries)) {
ext4_lblk_t newblock;
int levels = frame - frames + 1;
unsigned int icount;
int add_level = 1;
struct dx_entry *entries2;
struct dx_node *node2;
struct buffer_head *bh2;
while (frame > frames) {
if (dx_get_count((frame - 1)->entries) <
dx_get_limit((frame - 1)->entries)) {
add_level = 0;
break;
}
frame--;
at = frame->at;
entries = frame->entries;
restart = 1;
}
if (add_level && levels == ext4_dir_htree_level(sb)) {
ext4_warning(sb, "Directory (ino: %lu) index full, "
"reach max htree level :%d",
dir->i_ino, levels);
if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) {
ext4_warning(sb, "Large directory feature is "
"not enabled on this "
"filesystem");
}
err = -ENOSPC;
goto cleanup;
}
icount = dx_get_count(entries);
bh2 = ext4_append(handle, dir, &newblock);
if (IS_ERR(bh2)) {
err = PTR_ERR(bh2);
goto cleanup;
}
node2 = (struct dx_node *)(bh2->b_data);
entries2 = node2->entries;
memset(&node2->fake, 0, sizeof(struct fake_dirent));
node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize,
sb->s_blocksize);
BUFFER_TRACE(frame->bh, "get_write_access");
err = ext4_journal_get_write_access(handle, sb, frame->bh,
EXT4_JTR_NONE);
if (err) {
brelse(bh2);
goto journal_error;
}
if (!add_level) {
unsigned icount1 = icount/2, icount2 = icount - icount1;
unsigned hash2 = dx_get_hash(entries + icount1);
dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
icount1, icount2));
BUFFER_TRACE(frame->bh, "get_write_access");
err = ext4_journal_get_write_access(handle, sb,
(frame - 1)->bh,
EXT4_JTR_NONE);
if (err) {
brelse(bh2);
goto journal_error;
}
memcpy((char *) entries2, (char *) (entries + icount1),
icount2 * sizeof(struct dx_entry));
dx_set_count(entries, icount1);
dx_set_count(entries2, icount2);
dx_set_limit(entries2, dx_node_limit(dir));
if (at - entries >= icount1) {
frame->at = at - entries - icount1 + entries2;
frame->entries = entries = entries2;
swap(frame->bh, bh2);
}
dx_insert_block((frame - 1), hash2, newblock);
dxtrace(dx_show_index("node", frame->entries));
dxtrace(dx_show_index("node",
((struct dx_node *) bh2->b_data)->entries));
err = ext4_handle_dirty_dx_node(handle, dir, bh2);
if (err) {
brelse(bh2);
goto journal_error;
}
brelse (bh2);
err = ext4_handle_dirty_dx_node(handle, dir,
(frame - 1)->bh);
if (err)
goto journal_error;
err = ext4_handle_dirty_dx_node(handle, dir,
frame->bh);
if (restart || err)
goto journal_error;
} else {
struct dx_root *dxroot;
memcpy((char *) entries2, (char *) entries,
icount * sizeof(struct dx_entry));
dx_set_limit(entries2, dx_node_limit(dir));
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;
dxtrace(printk(KERN_DEBUG
"Creating %d level index...\n",
dxroot->info.indirect_levels));
err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
if (err) {
brelse(bh2);
goto journal_error;
}
err = ext4_handle_dirty_dx_node(handle, dir, bh2);
brelse(bh2);
restart = 1;
goto journal_error;
}
}
de = do_split(handle, dir, &bh, frame, &fname->hinfo);
if (IS_ERR(de)) {
err = PTR_ERR(de);
goto cleanup;
}
err = add_dirent_to_buf(handle, fname, dir, inode, de, bh);
goto cleanup;
journal_error:
ext4_std_error(dir->i_sb, err);
cleanup:
brelse(bh);
dx_release(frames);
if (restart && err == 0)
goto again;
return err;
}
int ext4_generic_delete_entry(struct inode *dir,
struct ext4_dir_entry_2 *de_del,
struct buffer_head *bh,
void *entry_buf,
int buf_size,
int csum_size)
{
struct ext4_dir_entry_2 *de, *pde;
unsigned int blocksize = dir->i_sb->s_blocksize;
int i;
i = 0;
pde = NULL;
de = entry_buf;
while (i < buf_size - csum_size) {
if (ext4_check_dir_entry(dir, NULL, de, bh,
entry_buf, buf_size, i))
return -EFSCORRUPTED;
if (de == de_del) {
if (pde) {
pde->rec_len = ext4_rec_len_to_disk(
ext4_rec_len_from_disk(pde->rec_len,
blocksize) +
ext4_rec_len_from_disk(de->rec_len,
blocksize),
blocksize);
memset(de, 0, ext4_rec_len_from_disk(de->rec_len,
blocksize));
} else {
de->inode = 0;
memset(&de->name_len, 0,
ext4_rec_len_from_disk(de->rec_len,
blocksize) -
offsetof(struct ext4_dir_entry_2,
name_len));
}
inode_inc_iversion(dir);
return 0;
}
i += ext4_rec_len_from_disk(de->rec_len, blocksize);
pde = de;
de = ext4_next_entry(de, blocksize);
}
return -ENOENT;
}
static int ext4_delete_entry(handle_t *handle,
struct inode *dir,
struct ext4_dir_entry_2 *de_del,
struct buffer_head *bh)
{
int err, csum_size = 0;
if (ext4_has_inline_data(dir)) {
int has_inline_data = 1;
err = ext4_delete_inline_entry(handle, dir, de_del, bh,
&has_inline_data);
if (has_inline_data)
return err;
}
if (ext4_has_feature_metadata_csum(dir->i_sb))
csum_size = sizeof(struct ext4_dir_entry_tail);
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, dir->i_sb, bh,
EXT4_JTR_NONE);
if (unlikely(err))
goto out;
err = ext4_generic_delete_entry(dir, de_del, bh, bh->b_data,
dir->i_sb->s_blocksize, csum_size);
if (err)
goto out;
BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
err = ext4_handle_dirty_dirblock(handle, dir, bh);
if (unlikely(err))
goto out;
return 0;
out:
if (err != -ENOENT)
ext4_std_error(dir->i_sb, err);
return err;
}
static void ext4_inc_count(struct inode *inode)
{
inc_nlink(inode);
if (is_dx(inode) &&
(inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
set_nlink(inode, 1);
}
static void ext4_dec_count(struct inode *inode)
{
if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
drop_nlink(inode);
}
static int ext4_add_nondir(handle_t *handle,
struct dentry *dentry, struct inode **inodep)
{
struct inode *dir = d_inode(dentry->d_parent);
struct inode *inode = *inodep;
int err = ext4_add_entry(handle, dentry, inode);
if (!err) {
err = ext4_mark_inode_dirty(handle, inode);
if (IS_DIRSYNC(dir))
ext4_handle_sync(handle);
d_instantiate_new(dentry, inode);
*inodep = NULL;
return err;
}
drop_nlink(inode);
ext4_mark_inode_dirty(handle, inode);
ext4_orphan_add(handle, inode);
unlock_new_inode(inode);
return err;
}
static int ext4_create(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode, bool excl)
{
handle_t *handle;
struct inode *inode;
int err, credits, retries = 0;
err = dquot_initialize(dir);
if (err)
return err;
credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
retry:
inode = ext4_new_inode_start_handle(idmap, dir, mode, &dentry->d_name,
0, NULL, EXT4_HT_DIR, credits);
handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
inode->i_op = &ext4_file_inode_operations;
inode->i_fop = &ext4_file_operations;
ext4_set_aops(inode);
err = ext4_add_nondir(handle, dentry, &inode);
if (!err)
ext4_fc_track_create(handle, dentry);
}
if (handle)
ext4_journal_stop(handle);
if (!IS_ERR_OR_NULL(inode))
iput(inode);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
}
static int ext4_mknod(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode, dev_t rdev)
{
handle_t *handle;
struct inode *inode;
int err, credits, retries = 0;
err = dquot_initialize(dir);
if (err)
return err;
credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
retry:
inode = ext4_new_inode_start_handle(idmap, dir, mode, &dentry->d_name,
0, NULL, EXT4_HT_DIR, credits);
handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
init_special_inode(inode, inode->i_mode, rdev);
inode->i_op = &ext4_special_inode_operations;
err = ext4_add_nondir(handle, dentry, &inode);
if (!err)
ext4_fc_track_create(handle, dentry);
}
if (handle)
ext4_journal_stop(handle);
if (!IS_ERR_OR_NULL(inode))
iput(inode);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
}
static int ext4_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
struct file *file, umode_t mode)
{
handle_t *handle;
struct inode *inode;
int err, retries = 0;
err = dquot_initialize(dir);
if (err)
return err;
retry:
inode = ext4_new_inode_start_handle(idmap, dir, mode,
NULL, 0, NULL,
EXT4_HT_DIR,
EXT4_MAXQUOTAS_TRANS_BLOCKS(dir->i_sb) +
4 + EXT4_XATTR_TRANS_BLOCKS);
handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (!IS_ERR(inode)) {
inode->i_op = &ext4_file_inode_operations;
inode->i_fop = &ext4_file_operations;
ext4_set_aops(inode);
d_tmpfile(file, inode);
err = ext4_orphan_add(handle, inode);
if (err)
goto err_unlock_inode;
mark_inode_dirty(inode);
unlock_new_inode(inode);
}
if (handle)
ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return finish_open_simple(file, err);
err_unlock_inode:
ext4_journal_stop(handle);
unlock_new_inode(inode);
return err;
}
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);
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;
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);
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);
}
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,
struct inode *inode)
{
struct buffer_head *dir_block = NULL;
ext4_lblk_t block = 0;
int err;
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)
goto out;
if (!err)
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);
err = ext4_init_dirblock(handle, inode, dir_block, dir->i_ino, NULL, 0);
out:
brelse(dir_block);
return err;
}
static struct dentry *ext4_mkdir(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, umode_t mode)
{
handle_t *handle;
struct inode *inode;
int err, err2 = 0, credits, retries = 0;
if (EXT4_DIR_LINK_MAX(dir))
return ERR_PTR(-EMLINK);
err = dquot_initialize(dir);
if (err)
return ERR_PTR(err);
credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
retry:
inode = ext4_new_inode_start_handle(idmap, dir, S_IFDIR | mode,
&dentry->d_name,
0, NULL, EXT4_HT_DIR, credits);
handle = ext4_journal_current_handle();
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_stop;
inode->i_op = &ext4_dir_inode_operations;
inode->i_fop = &ext4_dir_operations;
err = ext4_init_new_dir(handle, dir, inode);
if (err)
goto out_clear_inode;
err = ext4_mark_inode_dirty(handle, inode);
if (!err)
err = ext4_add_entry(handle, dentry, inode);
if (err) {
out_clear_inode:
clear_nlink(inode);
ext4_orphan_add(handle, inode);
unlock_new_inode(inode);
err2 = ext4_mark_inode_dirty(handle, inode);
if (unlikely(err2))
err = err2;
ext4_journal_stop(handle);
iput(inode);
goto out_retry;
}
ext4_inc_count(dir);
ext4_update_dx_flag(dir);
err = ext4_mark_inode_dirty(handle, dir);
if (err)
goto out_clear_inode;
d_instantiate_new(dentry, inode);
ext4_fc_track_create(handle, dentry);
if (IS_DIRSYNC(dir))
ext4_handle_sync(handle);
out_stop:
if (handle)
ext4_journal_stop(handle);
out_retry:
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return ERR_PTR(err);
}
bool ext4_empty_dir(struct inode *inode)
{
unsigned int offset;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de;
struct super_block *sb;
if (ext4_has_inline_data(inode)) {
int has_inline_data = 1;
int ret;
ret = empty_inline_dir(inode, &has_inline_data);
if (has_inline_data)
return ret;
}
sb = inode->i_sb;
if (inode->i_size < ext4_dir_rec_len(1, NULL) +
ext4_dir_rec_len(2, NULL)) {
EXT4_ERROR_INODE(inode, "invalid size");
return false;
}
bh = ext4_read_dirblock(inode, 0, EITHER);
if (IS_ERR(bh))
return false;
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 || de->name_len != 1 ||
de->name[0] != '.') {
ext4_warning_inode(inode, "directory missing '.'");
brelse(bh);
return false;
}
offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
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 || de->name_len != 2 ||
de->name[0] != '.' || de->name[1] != '.') {
ext4_warning_inode(inode, "directory missing '..'");
brelse(bh);
return false;
}
offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
while (offset < inode->i_size) {
if (!(offset & (sb->s_blocksize - 1))) {
unsigned int lblock;
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 false;
}
de = (struct ext4_dir_entry_2 *) (bh->b_data +
(offset & (sb->s_blocksize - 1)));
if (ext4_check_dir_entry(inode, NULL, de, bh,
bh->b_data, bh->b_size, offset) ||
le32_to_cpu(de->inode)) {
brelse(bh);
return false;
}
offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
}
brelse(bh);
return true;
}
static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
{
int retval;
struct inode *inode;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de = NULL;
handle_t *handle = NULL;
retval = ext4_emergency_state(dir->i_sb);
if (unlikely(retval))
return retval;
retval = dquot_initialize(dir);
if (retval)
return retval;
retval = dquot_initialize(d_inode(dentry));
if (retval)
return retval;
retval = -ENOENT;
bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL);
if (IS_ERR(bh))
return PTR_ERR(bh);
if (!bh)
goto end_rmdir;
inode = d_inode(dentry);
retval = -EFSCORRUPTED;
if (le32_to_cpu(de->inode) != inode->i_ino)
goto end_rmdir;
retval = -ENOTEMPTY;
if (!ext4_empty_dir(inode))
goto end_rmdir;
handle = ext4_journal_start(dir, EXT4_HT_DIR,
EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
if (IS_ERR(handle)) {
retval = PTR_ERR(handle);
handle = NULL;
goto end_rmdir;
}
if (IS_DIRSYNC(dir))
ext4_handle_sync(handle);
retval = ext4_delete_entry(handle, dir, de, bh);
if (retval)
goto end_rmdir;
if (!EXT4_DIR_LINK_EMPTY(inode))
ext4_warning_inode(inode,
"empty directory '%.*s' has too many links (%u)",
dentry->d_name.len, dentry->d_name.name,
inode->i_nlink);
inode_inc_iversion(inode);
clear_nlink(inode);
inode->i_size = 0;
ext4_orphan_add(handle, inode);
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
inode_set_ctime_current(inode);
retval = ext4_mark_inode_dirty(handle, inode);
if (retval)
goto end_rmdir;
ext4_dec_count(dir);
ext4_update_dx_flag(dir);
ext4_fc_track_unlink(handle, dentry);
retval = ext4_mark_inode_dirty(handle, dir);
if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir))
d_invalidate(dentry);
end_rmdir:
brelse(bh);
if (handle)
ext4_journal_stop(handle);
return retval;
}
int __ext4_unlink(struct inode *dir, const struct qstr *d_name,
struct inode *inode,
struct dentry *dentry )
{
int retval = -ENOENT;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de = NULL;
handle_t *handle;
int skip_remove_dentry = 0;
bh = ext4_find_entry(dir, d_name, &de, NULL);
if (IS_ERR(bh))
return PTR_ERR(bh);
if (!bh)
return -ENOENT;
if (le32_to_cpu(de->inode) != inode->i_ino) {
if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY)
skip_remove_dentry = 1;
else
goto out_bh;
}
handle = ext4_journal_start(dir, EXT4_HT_DIR,
EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
if (IS_ERR(handle)) {
retval = PTR_ERR(handle);
goto out_bh;
}
if (IS_DIRSYNC(dir))
ext4_handle_sync(handle);
if (!skip_remove_dentry) {
retval = ext4_delete_entry(handle, dir, de, bh);
if (retval)
goto out_handle;
inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
ext4_update_dx_flag(dir);
retval = ext4_mark_inode_dirty(handle, dir);
if (retval)
goto out_handle;
} else {
retval = 0;
}
if (inode->i_nlink == 0)
ext4_warning_inode(inode, "Deleting file '%.*s' with no links",
d_name->len, d_name->name);
else
drop_nlink(inode);
if (!inode->i_nlink)
ext4_orphan_add(handle, inode);
inode_set_ctime_current(inode);
retval = ext4_mark_inode_dirty(handle, inode);
if (dentry && !retval)
ext4_fc_track_unlink(handle, dentry);
out_handle:
ext4_journal_stop(handle);
out_bh:
brelse(bh);
return retval;
}
static int ext4_unlink(struct inode *dir, struct dentry *dentry)
{
int retval;
retval = ext4_emergency_state(dir->i_sb);
if (unlikely(retval))
return retval;
trace_ext4_unlink_enter(dir, dentry);
retval = dquot_initialize(dir);
if (retval)
goto out_trace;
retval = dquot_initialize(d_inode(dentry));
if (retval)
goto out_trace;
retval = __ext4_unlink(dir, &dentry->d_name, d_inode(dentry), dentry);
if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir))
d_invalidate(dentry);
out_trace:
trace_ext4_unlink_exit(dentry, retval);
return retval;
}
static int ext4_init_symlink_block(handle_t *handle, struct inode *inode,
struct fscrypt_str *disk_link)
{
struct buffer_head *bh;
char *kaddr;
int err = 0;
bh = ext4_bread(handle, inode, 0, EXT4_GET_BLOCKS_CREATE);
if (IS_ERR(bh))
return PTR_ERR(bh);
BUFFER_TRACE(bh, "get_write_access");
err = ext4_journal_get_write_access(handle, inode->i_sb, bh, EXT4_JTR_NONE);
if (err)
goto out;
kaddr = (char *)bh->b_data;
memcpy(kaddr, disk_link->name, disk_link->len);
inode->i_size = disk_link->len - 1;
EXT4_I(inode)->i_disksize = inode->i_size;
err = ext4_handle_dirty_metadata(handle, inode, bh);
out:
brelse(bh);
return err;
}
static int ext4_symlink(struct mnt_idmap *idmap, struct inode *dir,
struct dentry *dentry, const char *symname)
{
handle_t *handle;
struct inode *inode;
int err, len = strlen(symname);
int credits;
struct fscrypt_str disk_link;
int retries = 0;
err = ext4_emergency_state(dir->i_sb);
if (unlikely(err))
return err;
err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
&disk_link);
if (err)
return err;
err = dquot_initialize(dir);
if (err)
return err;
credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
retry:
inode = ext4_new_inode_start_handle(idmap, dir, S_IFLNK|S_IRWXUGO,
&dentry->d_name, 0, NULL,
EXT4_HT_DIR, credits);
handle = ext4_journal_current_handle();
if (IS_ERR(inode)) {
if (handle)
ext4_journal_stop(handle);
err = PTR_ERR(inode);
goto out_retry;
}
if (IS_ENCRYPTED(inode)) {
err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
if (err)
goto err_drop_inode;
inode->i_op = &ext4_encrypted_symlink_inode_operations;
} else {
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
inode->i_op = &ext4_symlink_inode_operations;
} else {
inode->i_op = &ext4_fast_symlink_inode_operations;
}
}
if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
err = ext4_init_symlink_block(handle, inode, &disk_link);
if (err)
goto err_drop_inode;
} else {
ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
disk_link.len);
inode->i_size = disk_link.len - 1;
EXT4_I(inode)->i_disksize = inode->i_size;
if (!IS_ENCRYPTED(inode))
inode_set_cached_link(inode, (char *)&EXT4_I(inode)->i_data,
inode->i_size);
}
err = ext4_add_nondir(handle, dentry, &inode);
if (handle)
ext4_journal_stop(handle);
iput(inode);
goto out_retry;
err_drop_inode:
clear_nlink(inode);
ext4_mark_inode_dirty(handle, inode);
ext4_orphan_add(handle, inode);
unlock_new_inode(inode);
if (handle)
ext4_journal_stop(handle);
iput(inode);
out_retry:
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
if (disk_link.name != (unsigned char *)symname)
kfree(disk_link.name);
return err;
}
int __ext4_link(struct inode *dir, struct inode *inode, struct dentry *dentry)
{
handle_t *handle;
int err, retries = 0;
retry:
handle = ext4_journal_start(dir, EXT4_HT_DIR,
(EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
if (IS_ERR(handle))
return PTR_ERR(handle);
if (IS_DIRSYNC(dir))
ext4_handle_sync(handle);
inode_set_ctime_current(inode);
ext4_inc_count(inode);
ihold(inode);
err = ext4_add_entry(handle, dentry, inode);
if (!err) {
err = ext4_mark_inode_dirty(handle, inode);
if (inode->i_nlink == 1)
ext4_orphan_del(handle, inode);
d_instantiate(dentry, inode);
ext4_fc_track_link(handle, dentry);
} else {
drop_nlink(inode);
iput(inode);
}
ext4_journal_stop(handle);
if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
goto retry;
return err;
}
static int ext4_link(struct dentry *old_dentry,
struct inode *dir, struct dentry *dentry)
{
struct inode *inode = d_inode(old_dentry);
int err;
if (inode->i_nlink >= EXT4_LINK_MAX)
return -EMLINK;
err = fscrypt_prepare_link(old_dentry, dir, dentry);
if (err)
return err;
if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
(!projid_eq(EXT4_I(dir)->i_projid,
EXT4_I(old_dentry->d_inode)->i_projid)))
return -EXDEV;
err = dquot_initialize(dir);
if (err)
return err;
return __ext4_link(dir, inode, dentry);
}
static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
struct inode *inode,
int *retval,
struct ext4_dir_entry_2 **parent_de,
int *inlined)
{
struct buffer_head *bh;
if (!ext4_has_inline_data(inode)) {
struct ext4_dir_entry_2 *de;
unsigned int offset;
bh = ext4_read_dirblock(inode, 0, EITHER);
if (IS_ERR(bh)) {
*retval = PTR_ERR(bh);
return NULL;
}
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 ||
de->name_len != 1 || de->name[0] != '.') {
EXT4_ERROR_INODE(inode, "directory missing '.'");
brelse(bh);
*retval = -EFSCORRUPTED;
return NULL;
}
offset = ext4_rec_len_from_disk(de->rec_len,
inode->i_sb->s_blocksize);
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 || de->name_len != 2 ||
de->name[0] != '.' || de->name[1] != '.') {
EXT4_ERROR_INODE(inode, "directory missing '..'");
brelse(bh);
*retval = -EFSCORRUPTED;
return NULL;
}
*parent_de = de;
return bh;
}
*inlined = 1;
return ext4_get_first_inline_block(inode, parent_de, retval);
}
struct ext4_renament {
struct inode *dir;
struct dentry *dentry;
struct inode *inode;
bool is_dir;
int dir_nlink_delta;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de;
int inlined;
struct buffer_head *dir_bh;
struct ext4_dir_entry_2 *parent_de;
int dir_inlined;
};
static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent, bool is_cross)
{
int retval;
ent->is_dir = true;
if (!is_cross)
return 0;
ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
&retval, &ent->parent_de,
&ent->dir_inlined);
if (!ent->dir_bh)
return retval;
if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
return -EFSCORRUPTED;
BUFFER_TRACE(ent->dir_bh, "get_write_access");
return ext4_journal_get_write_access(handle, ent->dir->i_sb,
ent->dir_bh, EXT4_JTR_NONE);
}
static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
unsigned dir_ino)
{
int retval;
if (!ent->dir_bh)
return 0;
ent->parent_de->inode = cpu_to_le32(dir_ino);
BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
if (!ent->dir_inlined) {
if (is_dx(ent->inode)) {
retval = ext4_handle_dirty_dx_node(handle,
ent->inode,
ent->dir_bh);
} else {
retval = ext4_handle_dirty_dirblock(handle, ent->inode,
ent->dir_bh);
}
} else {
retval = ext4_mark_inode_dirty(handle, ent->inode);
}
if (retval) {
ext4_std_error(ent->dir->i_sb, retval);
return retval;
}
return 0;
}
static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
unsigned ino, unsigned file_type)
{
int retval, retval2;
BUFFER_TRACE(ent->bh, "get write access");
retval = ext4_journal_get_write_access(handle, ent->dir->i_sb, ent->bh,
EXT4_JTR_NONE);
if (retval)
return retval;
ent->de->inode = cpu_to_le32(ino);
if (ext4_has_feature_filetype(ent->dir->i_sb))
ent->de->file_type = file_type;
inode_inc_iversion(ent->dir);
inode_set_mtime_to_ts(ent->dir, inode_set_ctime_current(ent->dir));
retval = ext4_mark_inode_dirty(handle, ent->dir);
BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
if (!ent->inlined) {
retval2 = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh);
if (unlikely(retval2)) {
ext4_std_error(ent->dir->i_sb, retval2);
return retval2;
}
}
return retval;
}
static void ext4_resetent(handle_t *handle, struct ext4_renament *ent,
unsigned ino, unsigned file_type)
{
struct ext4_renament old = *ent;
int retval = 0;
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de,
&old.inlined);
if (IS_ERR(old.bh))
retval = PTR_ERR(old.bh);
if (!old.bh)
retval = -ENOENT;
if (retval) {
ext4_std_error(old.dir->i_sb, retval);
return;
}
ext4_setent(handle, &old, ino, file_type);
brelse(old.bh);
}
static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
const struct qstr *d_name)
{
int retval = -ENOENT;
struct buffer_head *bh;
struct ext4_dir_entry_2 *de = NULL;
bh = ext4_find_entry(dir, d_name, &de, NULL);
if (IS_ERR(bh))
return PTR_ERR(bh);
if (bh) {
retval = ext4_delete_entry(handle, dir, de, bh);
brelse(bh);
}
return retval;
}
static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent,
int force_reread)
{
int retval;
if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
ent->de->name_len != ent->dentry->d_name.len ||
strncmp(ent->de->name, ent->dentry->d_name.name,
ent->de->name_len) ||
force_reread) {
retval = ext4_find_delete_entry(handle, ent->dir,
&ent->dentry->d_name);
} else {
retval = ext4_delete_entry(handle, ent->dir, ent->de, ent->bh);
if (retval == -ENOENT) {
retval = ext4_find_delete_entry(handle, ent->dir,
&ent->dentry->d_name);
}
}
if (retval) {
ext4_warning_inode(ent->dir,
"Deleting old file: nlink %d, error=%d",
ent->dir->i_nlink, retval);
}
}
static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
{
if (ent->dir_nlink_delta) {
if (ent->dir_nlink_delta == -1)
ext4_dec_count(ent->dir);
else
ext4_inc_count(ent->dir);
ext4_mark_inode_dirty(handle, ent->dir);
}
}
static struct inode *ext4_whiteout_for_rename(struct mnt_idmap *idmap,
struct ext4_renament *ent,
int credits, handle_t **h)
{
struct inode *wh;
handle_t *handle;
int retries = 0;
credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
EXT4_XATTR_TRANS_BLOCKS + 4);
retry:
wh = ext4_new_inode_start_handle(idmap, ent->dir,
S_IFCHR | WHITEOUT_MODE,
&ent->dentry->d_name, 0, NULL,
EXT4_HT_DIR, credits);
handle = ext4_journal_current_handle();
if (IS_ERR(wh)) {
if (handle)
ext4_journal_stop(handle);
if (PTR_ERR(wh) == -ENOSPC &&
ext4_should_retry_alloc(ent->dir->i_sb, &retries))
goto retry;
} else {
*h = handle;
init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
wh->i_op = &ext4_special_inode_operations;
}
return wh;
}
static int ext4_rename(struct mnt_idmap *idmap, struct inode *old_dir,
struct dentry *old_dentry, struct inode *new_dir,
struct dentry *new_dentry, unsigned int flags)
{
handle_t *handle = NULL;
struct ext4_renament old = {
.dir = old_dir,
.dentry = old_dentry,
.inode = d_inode(old_dentry),
};
struct ext4_renament new = {
.dir = new_dir,
.dentry = new_dentry,
.inode = d_inode(new_dentry),
};
int force_reread;
int retval;
struct inode *whiteout = NULL;
int credits;
u8 old_file_type;
if (new.inode && new.inode->i_nlink == 0) {
EXT4_ERROR_INODE(new.inode,
"target of rename is already freed");
return -EFSCORRUPTED;
}
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
(!projid_eq(EXT4_I(new_dir)->i_projid,
EXT4_I(old_dentry->d_inode)->i_projid)))
return -EXDEV;
retval = dquot_initialize(old.dir);
if (retval)
return retval;
retval = dquot_initialize(old.inode);
if (retval)
return retval;
retval = dquot_initialize(new.dir);
if (retval)
return retval;
if (new.inode) {
retval = dquot_initialize(new.inode);
if (retval)
return retval;
}
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de,
&old.inlined);
if (IS_ERR(old.bh))
return PTR_ERR(old.bh);
retval = -ENOENT;
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
goto release_bh;
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
&new.de, &new.inlined);
if (IS_ERR(new.bh)) {
retval = PTR_ERR(new.bh);
new.bh = NULL;
goto release_bh;
}
if (new.bh) {
if (!new.inode) {
brelse(new.bh);
new.bh = NULL;
}
}
if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
ext4_alloc_da_blocks(old.inode);
credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
if (!(flags & RENAME_WHITEOUT)) {
handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
if (IS_ERR(handle)) {
retval = PTR_ERR(handle);
goto release_bh;
}
} else {
whiteout = ext4_whiteout_for_rename(idmap, &old, credits, &handle);
if (IS_ERR(whiteout)) {
retval = PTR_ERR(whiteout);
goto release_bh;
}
}
old_file_type = old.de->file_type;
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
ext4_handle_sync(handle);
if (S_ISDIR(old.inode->i_mode)) {
if (new.inode) {
retval = -ENOTEMPTY;
if (!ext4_empty_dir(new.inode))
goto end_rename;
} else {
retval = -EMLINK;
if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
goto end_rename;
}
retval = ext4_rename_dir_prepare(handle, &old, new.dir != old.dir);
if (retval)
goto end_rename;
}
force_reread = (new.dir->i_ino == old.dir->i_ino &&
ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
if (whiteout) {
retval = ext4_setent(handle, &old, whiteout->i_ino,
EXT4_FT_CHRDEV);
if (retval)
goto end_rename;
retval = ext4_mark_inode_dirty(handle, whiteout);
if (unlikely(retval))
goto end_rename;
}
if (!new.bh) {
retval = ext4_add_entry(handle, new.dentry, old.inode);
if (retval)
goto end_rename;
} else {
retval = ext4_setent(handle, &new,
old.inode->i_ino, old_file_type);
if (retval)
goto end_rename;
}
if (force_reread)
force_reread = !ext4_test_inode_flag(new.dir,
EXT4_INODE_INLINE_DATA);
inode_set_ctime_current(old.inode);
retval = ext4_mark_inode_dirty(handle, old.inode);
if (unlikely(retval))
goto end_rename;
if (!whiteout) {
ext4_rename_delete(handle, &old, force_reread);
}
if (new.inode) {
ext4_dec_count(new.inode);
inode_set_ctime_current(new.inode);
}
inode_set_mtime_to_ts(old.dir, inode_set_ctime_current(old.dir));
ext4_update_dx_flag(old.dir);
if (old.is_dir) {
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
if (retval)
goto end_rename;
ext4_dec_count(old.dir);
if (new.inode) {
clear_nlink(new.inode);
} else {
ext4_inc_count(new.dir);
ext4_update_dx_flag(new.dir);
retval = ext4_mark_inode_dirty(handle, new.dir);
if (unlikely(retval))
goto end_rename;
}
}
retval = ext4_mark_inode_dirty(handle, old.dir);
if (unlikely(retval))
goto end_rename;
if (old.is_dir) {
ext4_fc_mark_ineligible(old.inode->i_sb,
EXT4_FC_REASON_RENAME_DIR, handle);
} else {
struct super_block *sb = old.inode->i_sb;
if (new.inode)
ext4_fc_track_unlink(handle, new.dentry);
if (test_opt2(sb, JOURNAL_FAST_COMMIT) &&
!(EXT4_SB(sb)->s_mount_state & EXT4_FC_REPLAY) &&
!(ext4_test_mount_flag(sb, EXT4_MF_FC_INELIGIBLE))) {
__ext4_fc_track_link(handle, old.inode, new.dentry);
__ext4_fc_track_unlink(handle, old.inode, old.dentry);
if (whiteout)
__ext4_fc_track_create(handle, whiteout,
old.dentry);
}
}
if (new.inode) {
retval = ext4_mark_inode_dirty(handle, new.inode);
if (unlikely(retval))
goto end_rename;
if (!new.inode->i_nlink)
ext4_orphan_add(handle, new.inode);
}
retval = 0;
end_rename:
if (whiteout) {
if (retval) {
ext4_resetent(handle, &old,
old.inode->i_ino, old_file_type);
drop_nlink(whiteout);
ext4_mark_inode_dirty(handle, whiteout);
ext4_orphan_add(handle, whiteout);
}
unlock_new_inode(whiteout);
ext4_journal_stop(handle);
iput(whiteout);
} else {
ext4_journal_stop(handle);
}
release_bh:
brelse(old.dir_bh);
brelse(old.bh);
brelse(new.bh);
return retval;
}
static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
handle_t *handle = NULL;
struct ext4_renament old = {
.dir = old_dir,
.dentry = old_dentry,
.inode = d_inode(old_dentry),
};
struct ext4_renament new = {
.dir = new_dir,
.dentry = new_dentry,
.inode = d_inode(new_dentry),
};
u8 new_file_type;
int retval;
if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
!projid_eq(EXT4_I(new_dir)->i_projid,
EXT4_I(old_dentry->d_inode)->i_projid)) ||
(ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
!projid_eq(EXT4_I(old_dir)->i_projid,
EXT4_I(new_dentry->d_inode)->i_projid)))
return -EXDEV;
retval = dquot_initialize(old.dir);
if (retval)
return retval;
retval = dquot_initialize(new.dir);
if (retval)
return retval;
old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
&old.de, &old.inlined);
if (IS_ERR(old.bh))
return PTR_ERR(old.bh);
retval = -ENOENT;
if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
goto end_rename;
new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
&new.de, &new.inlined);
if (IS_ERR(new.bh)) {
retval = PTR_ERR(new.bh);
new.bh = NULL;
goto end_rename;
}
if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
goto end_rename;
handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
if (IS_ERR(handle)) {
retval = PTR_ERR(handle);
handle = NULL;
goto end_rename;
}
if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
ext4_handle_sync(handle);
if (S_ISDIR(old.inode->i_mode)) {
retval = ext4_rename_dir_prepare(handle, &old, new.dir != old.dir);
if (retval)
goto end_rename;
}
if (S_ISDIR(new.inode->i_mode)) {
retval = ext4_rename_dir_prepare(handle, &new, new.dir != old.dir);
if (retval)
goto end_rename;
}
if (old.dir != new.dir && old.is_dir != new.is_dir) {
old.dir_nlink_delta = old.is_dir ? -1 : 1;
new.dir_nlink_delta = -old.dir_nlink_delta;
retval = -EMLINK;
if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
(new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
goto end_rename;
}
new_file_type = new.de->file_type;
retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
if (retval)
goto end_rename;
retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
if (retval)
goto end_rename;
inode_set_ctime_current(old.inode);
inode_set_ctime_current(new.inode);
retval = ext4_mark_inode_dirty(handle, old.inode);
if (unlikely(retval))
goto end_rename;
retval = ext4_mark_inode_dirty(handle, new.inode);
if (unlikely(retval))
goto end_rename;
ext4_fc_mark_ineligible(new.inode->i_sb,
EXT4_FC_REASON_CROSS_RENAME, handle);
if (old.dir_bh) {
retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
if (retval)
goto end_rename;
}
if (new.dir_bh) {
retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
if (retval)
goto end_rename;
}
ext4_update_dir_count(handle, &old);
ext4_update_dir_count(handle, &new);
retval = 0;
end_rename:
brelse(old.dir_bh);
brelse(new.dir_bh);
brelse(old.bh);
brelse(new.bh);
if (handle)
ext4_journal_stop(handle);
return retval;
}
static int ext4_rename2(struct mnt_idmap *idmap,
struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
int err;
err = ext4_emergency_state(old_dir->i_sb);
if (unlikely(err))
return err;
if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
return -EINVAL;
err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
flags);
if (err)
return err;
if (flags & RENAME_EXCHANGE) {
return ext4_cross_rename(old_dir, old_dentry,
new_dir, new_dentry);
}
return ext4_rename(idmap, old_dir, old_dentry, new_dir, new_dentry, flags);
}
const struct inode_operations ext4_dir_inode_operations = {
.create = ext4_create,
.lookup = ext4_lookup,
.link = ext4_link,
.unlink = ext4_unlink,
.symlink = ext4_symlink,
.mkdir = ext4_mkdir,
.rmdir = ext4_rmdir,
.mknod = ext4_mknod,
.tmpfile = ext4_tmpfile,
.rename = ext4_rename2,
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
.get_inode_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
.fiemap = ext4_fiemap,
.fileattr_get = ext4_fileattr_get,
.fileattr_set = ext4_fileattr_set,
};
const struct inode_operations ext4_special_inode_operations = {
.setattr = ext4_setattr,
.getattr = ext4_getattr,
.listxattr = ext4_listxattr,
.get_inode_acl = ext4_get_acl,
.set_acl = ext4_set_acl,
};
