diff options
Diffstat (limited to 'fs/ext4/namei.c')
| -rw-r--r-- | fs/ext4/namei.c | 553 |
1 files changed, 236 insertions, 317 deletions
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c index 814f3beb4369..011dcfb5cce3 100644 --- a/fs/ext4/namei.c +++ b/fs/ext4/namei.c @@ -61,7 +61,7 @@ static struct buffer_head *ext4_append(handle_t *handle, *block = inode->i_size >> inode->i_sb->s_blocksize_bits; - bh = ext4_bread(handle, inode, *block, 1); + bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE); if (IS_ERR(bh)) return bh; inode->i_size += inode->i_sb->s_blocksize; @@ -84,12 +84,13 @@ typedef enum { } dirblock_type_t; #define ext4_read_dirblock(inode, block, type) \ - __ext4_read_dirblock((inode), (block), (type), __LINE__) + __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, - unsigned int line) + ext4_lblk_t block, + dirblock_type_t type, + const char *func, + unsigned int line) { struct buffer_head *bh; struct ext4_dir_entry *dirent; @@ -97,15 +98,17 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, bh = ext4_bread(NULL, inode, block, 0); if (IS_ERR(bh)) { - __ext4_warning(inode->i_sb, __func__, line, - "error %ld reading directory block " - "(ino %lu, block %lu)", PTR_ERR(bh), inode->i_ino, - (unsigned long) block); + __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) { - ext4_error_inode(inode, __func__, line, block, "Directory hole found"); + ext4_error_inode(inode, func, line, block, + "Directory hole found"); return ERR_PTR(-EIO); } dirent = (struct ext4_dir_entry *) bh->b_data; @@ -119,7 +122,7 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, is_dx_block = 1; } if (!is_dx_block && type == INDEX) { - ext4_error_inode(inode, __func__, line, block, + ext4_error_inode(inode, func, line, block, "directory leaf block found instead of index block"); return ERR_PTR(-EIO); } @@ -136,8 +139,8 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, if (ext4_dx_csum_verify(inode, dirent)) set_buffer_verified(bh); else { - ext4_error_inode(inode, __func__, line, block, - "Directory index failed checksum"); + ext4_error_inode(inode, func, line, block, + "Directory index failed checksum"); brelse(bh); return ERR_PTR(-EIO); } @@ -146,8 +149,8 @@ static struct buffer_head *__ext4_read_dirblock(struct inode *inode, if (ext4_dirent_csum_verify(inode, dirent)) set_buffer_verified(bh); else { - ext4_error_inode(inode, __func__, line, block, - "Directory block failed checksum"); + ext4_error_inode(inode, func, line, block, + "Directory block failed checksum"); brelse(bh); return ERR_PTR(-EIO); } @@ -248,7 +251,7 @@ static void dx_set_count(struct dx_entry *entries, unsigned value); static void dx_set_limit(struct dx_entry *entries, unsigned value); static unsigned dx_root_limit(struct inode *dir, unsigned infosize); static unsigned dx_node_limit(struct inode *dir); -static struct dx_frame *dx_probe(const struct qstr *d_name, +static struct dx_frame *dx_probe(struct ext4_filename *fname, struct inode *dir, struct dx_hash_info *hinfo, struct dx_frame *frame); @@ -267,10 +270,10 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash, struct dx_frame *frames, __u32 *start_hash); static struct buffer_head * ext4_dx_find_entry(struct inode *dir, - const struct qstr *d_name, + struct ext4_filename *fname, struct ext4_dir_entry_2 **res_dir); -static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, - struct inode *inode); +static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, + struct dentry *dentry, struct inode *inode); /* checksumming functions */ void initialize_dirent_tail(struct ext4_dir_entry_tail *t, @@ -327,10 +330,14 @@ static __le32 ext4_dirent_csum(struct inode *inode, return cpu_to_le32(csum); } -static void warn_no_space_for_csum(struct inode *inode) +#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->i_sb, "no space in directory inode %lu leaf for " - "checksum. Please run e2fsck -D.", inode->i_ino); + __ext4_warning_inode(inode, func, line, + "No space for directory leaf checksum. Please run e2fsck -D."); } int ext4_dirent_csum_verify(struct inode *inode, struct ext4_dir_entry *dirent) @@ -607,17 +614,15 @@ static struct stats dx_show_leaf(struct inode *dir, char *name; struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}; - struct ext4_fname_crypto_ctx *ctx = NULL; - int res; + int res = 0; name = de->name; len = de->name_len; - ctx = ext4_get_fname_crypto_ctx(dir, - EXT4_NAME_LEN); - if (IS_ERR(ctx)) { - printk(KERN_WARNING "Error acquiring" - " crypto ctxt--skipping crypto\n"); - ctx = NULL; + if (ext4_encrypted_inode(inode)) + res = ext4_get_encryption_info(dir); + if (res) { + printk(KERN_WARNING "Error setting up" + " fname crypto: %d\n", res); } if (ctx == NULL) { /* Directory is not encrypted */ @@ -637,7 +642,6 @@ static struct stats dx_show_leaf(struct inode *dir, "allocating crypto " "buffer--skipping " "crypto\n"); - ext4_put_fname_crypto_ctx(&ctx); ctx = NULL; } res = ext4_fname_disk_to_usr(ctx, NULL, de, @@ -658,7 +662,6 @@ static struct stats dx_show_leaf(struct inode *dir, printk("%*.s:(E)%x.%u ", len, name, h.hash, (unsigned) ((char *) de - base)); - ext4_put_fname_crypto_ctx(&ctx); ext4_fname_crypto_free_buffer( &fname_crypto_str); } @@ -724,7 +727,7 @@ struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir, * back to userspace. */ static struct dx_frame * -dx_probe(const struct qstr *d_name, struct inode *dir, +dx_probe(struct ext4_filename *fname, struct inode *dir, struct dx_hash_info *hinfo, struct dx_frame *frame_in) { unsigned count, indirect; @@ -742,56 +745,41 @@ dx_probe(const struct qstr *d_name, struct inode *dir, if (root->info.hash_version != DX_HASH_TEA && root->info.hash_version != DX_HASH_HALF_MD4 && root->info.hash_version != DX_HASH_LEGACY) { - ext4_warning(dir->i_sb, "Unrecognised inode hash code %d", - root->info.hash_version); + ext4_warning_inode(dir, "Unrecognised inode hash code %u", + root->info.hash_version); 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; -#ifdef CONFIG_EXT4_FS_ENCRYPTION - if (d_name) { - struct ext4_fname_crypto_ctx *ctx = NULL; - int res; - - /* Check if the directory is encrypted */ - ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN); - if (IS_ERR(ctx)) { - ret_err = ERR_PTR(PTR_ERR(ctx)); - goto fail; - } - res = ext4_fname_usr_to_hash(ctx, d_name, hinfo); - if (res < 0) { - ret_err = ERR_PTR(res); - goto fail; - } - ext4_put_fname_crypto_ctx(&ctx); - } -#else - if (d_name) - ext4fs_dirhash(d_name->name, d_name->len, hinfo); -#endif + if (fname && fname_name(fname)) + ext4fs_dirhash(fname_name(fname), fname_len(fname), hinfo); hash = hinfo->hash; if (root->info.unused_flags & 1) { - ext4_warning(dir->i_sb, "Unimplemented inode hash flags: %#06x", - root->info.unused_flags); + ext4_warning_inode(dir, "Unimplemented hash flags: %#06x", + root->info.unused_flags); goto fail; } - if ((indirect = root->info.indirect_levels) > 1) { - ext4_warning(dir->i_sb, "Unimplemented inode hash depth: %#06x", - root->info.indirect_levels); + indirect = root->info.indirect_levels; + if (indirect > 1) { + ext4_warning_inode(dir, "Unimplemented hash depth: %#06x", + root->info.indirect_levels); goto fail; } - entries = (struct dx_entry *) (((char *)&root->info) + - root->info.info_length); + 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(dir->i_sb, "dx entry: limit != root limit"); + 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; } @@ -799,15 +787,16 @@ dx_probe(const struct qstr *d_name, struct inode *dir, while (1) { count = dx_get_count(entries); if (!count || count > dx_get_limit(entries)) { - ext4_warning(dir->i_sb, - "dx entry: no count or count > limit"); + 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; + m = p + (q - p) / 2; dxtrace(printk(".")); if (dx_get_hash(m) > hash) q = m - 1; @@ -831,7 +820,8 @@ dx_probe(const struct qstr *d_name, struct inode *dir, } at = p - 1; - dxtrace(printk(" %x->%u\n", at == entries? 0: dx_get_hash(at), dx_get_block(at))); + dxtrace(printk(" %x->%u\n", at == entries ? 0 : dx_get_hash(at), + dx_get_block(at))); frame->entries = entries; frame->at = at; if (!indirect--) @@ -845,9 +835,10 @@ dx_probe(const struct qstr *d_name, struct inode *dir, } entries = ((struct dx_node *) frame->bh->b_data)->entries; - if (dx_get_limit(entries) != dx_node_limit (dir)) { - ext4_warning(dir->i_sb, - "dx entry: limit != node limit"); + 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; } } @@ -858,18 +849,17 @@ fail: } if (ret_err == ERR_PTR(ERR_BAD_DX_DIR)) - ext4_warning(dir->i_sb, - "Corrupt dir inode %lu, running e2fsck is " - "recommended.", dir->i_ino); + ext4_warning_inode(dir, + "Corrupt directory, running e2fsck is recommended"); return ret_err; } -static void dx_release (struct dx_frame *frames) +static void dx_release(struct dx_frame *frames) { if (frames[0].bh == NULL) return; - if (((struct dx_root *) frames[0].bh->b_data)->info.indirect_levels) + if (((struct dx_root *)frames[0].bh->b_data)->info.indirect_levels) brelse(frames[1].bh); brelse(frames[0].bh); } @@ -962,7 +952,6 @@ static int htree_dirblock_to_tree(struct file *dir_file, struct buffer_head *bh; struct ext4_dir_entry_2 *de, *top; int err = 0, count = 0; - struct ext4_fname_crypto_ctx *ctx = NULL; struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}, tmp_str; dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n", @@ -977,17 +966,15 @@ static int htree_dirblock_to_tree(struct file *dir_file, EXT4_DIR_REC_LEN(0)); #ifdef CONFIG_EXT4_FS_ENCRYPTION /* Check if the directory is encrypted */ - ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN); - if (IS_ERR(ctx)) { - err = PTR_ERR(ctx); - brelse(bh); - return err; - } - if (ctx != NULL) { - err = ext4_fname_crypto_alloc_buffer(ctx, EXT4_NAME_LEN, + if (ext4_encrypted_inode(dir)) { + err = ext4_get_encryption_info(dir); + if (err < 0) { + brelse(bh); + return err; + } + err = ext4_fname_crypto_alloc_buffer(dir, EXT4_NAME_LEN, &fname_crypto_str); if (err < 0) { - ext4_put_fname_crypto_ctx(&ctx); brelse(bh); return err; } @@ -1008,16 +995,17 @@ static int htree_dirblock_to_tree(struct file *dir_file, continue; if (de->inode == 0) continue; - if (ctx == NULL) { - /* Directory is not encrypted */ + if (!ext4_encrypted_inode(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; + /* Directory is encrypted */ - err = ext4_fname_disk_to_usr(ctx, hinfo, de, + err = ext4_fname_disk_to_usr(dir, hinfo, de, &fname_crypto_str); if (err < 0) { count = err; @@ -1026,6 +1014,7 @@ static int htree_dirblock_to_tree(struct file *dir_file, 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; @@ -1036,7 +1025,6 @@ static int htree_dirblock_to_tree(struct file *dir_file, errout: brelse(bh); #ifdef CONFIG_EXT4_FS_ENCRYPTION - ext4_put_fname_crypto_ctx(&ctx); ext4_fname_crypto_free_buffer(&fname_crypto_str); #endif return count; @@ -1155,12 +1143,13 @@ errout: static inline int search_dirblock(struct buffer_head *bh, struct inode *dir, + struct ext4_filename *fname, const struct qstr *d_name, unsigned int offset, struct ext4_dir_entry_2 **res_dir) { - return search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, - d_name, offset, res_dir); + return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir, + fname, d_name, offset, res_dir); } /* @@ -1242,54 +1231,54 @@ static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block) * `len <= EXT4_NAME_LEN' is guaranteed by caller. * `de != NULL' is guaranteed by caller. */ -static inline int ext4_match(struct ext4_fname_crypto_ctx *ctx, - struct ext4_str *fname_crypto_str, - int len, const char * const name, +static inline int ext4_match(struct ext4_filename *fname, struct ext4_dir_entry_2 *de) { - int res; + const void *name = fname_name(fname); + u32 len = fname_len(fname); if (!de->inode) return 0; #ifdef CONFIG_EXT4_FS_ENCRYPTION - if (ctx) - return ext4_fname_match(ctx, fname_crypto_str, len, name, de); + if (unlikely(!name)) { + if (fname->usr_fname->name[0] == '_') { + int ret; + if (de->name_len < 16) + return 0; + ret = memcmp(de->name + de->name_len - 16, + fname->crypto_buf.name + 8, 16); + return (ret == 0) ? 1 : 0; + } + name = fname->crypto_buf.name; + len = fname->crypto_buf.len; + } #endif - if (len != de->name_len) + if (de->name_len != len) return 0; - res = memcmp(name, de->name, len); - return (res == 0) ? 1 : 0; + return (memcmp(de->name, name, len) == 0) ? 1 : 0; } /* * Returns 0 if not found, -1 on failure, and 1 on success */ -int search_dir(struct buffer_head *bh, char *search_buf, int buf_size, - struct inode *dir, const struct qstr *d_name, - unsigned int offset, struct ext4_dir_entry_2 **res_dir) +int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size, + struct inode *dir, struct ext4_filename *fname, + const struct qstr *d_name, + unsigned int offset, struct ext4_dir_entry_2 **res_dir) { struct ext4_dir_entry_2 * de; char * dlimit; int de_len; - const char *name = d_name->name; - int namelen = d_name->len; - struct ext4_fname_crypto_ctx *ctx = NULL; - struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}; int res; - ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN); - if (IS_ERR(ctx)) - return -1; - de = (struct ext4_dir_entry_2 *)search_buf; dlimit = search_buf + buf_size; while ((char *) de < dlimit) { /* this code is executed quadratically often */ /* do minimal checking `by hand' */ if ((char *) de + de->name_len <= dlimit) { - res = ext4_match(ctx, &fname_crypto_str, namelen, - name, de); + res = ext4_match(fname, de); if (res < 0) { res = -1; goto return_result; @@ -1322,8 +1311,6 @@ int search_dir(struct buffer_head *bh, char *search_buf, int buf_size, res = 0; return_result: - ext4_put_fname_crypto_ctx(&ctx); - ext4_fname_crypto_free_buffer(&fname_crypto_str); return res; } @@ -1370,7 +1357,8 @@ static struct buffer_head * ext4_find_entry (struct inode *dir, buffer */ int num = 0; ext4_lblk_t nblocks; - int i, namelen; + int i, namelen, retval; + struct ext4_filename fname; *res_dir = NULL; sb = dir->i_sb; @@ -1378,14 +1366,18 @@ static struct buffer_head * ext4_find_entry (struct inode *dir, if (namelen > EXT4_NAME_LEN) return NULL; + retval = ext4_fname_setup_filename(dir, d_name, 1, &fname); + if (retval) + return ERR_PTR(retval); + if (ext4_has_inline_data(dir)) { int has_inline_data = 1; - ret = ext4_find_inline_entry(dir, d_name, res_dir, + ret = ext4_find_inline_entry(dir, &fname, d_name, res_dir, &has_inline_data); if (has_inline_data) { if (inlined) *inlined = 1; - return ret; + goto cleanup_and_exit; } } @@ -1400,14 +1392,14 @@ static struct buffer_head * ext4_find_entry (struct inode *dir, goto restart; } if (is_dx(dir)) { - bh = ext4_dx_find_entry(dir, d_name, res_dir); + ret = ext4_dx_find_entry(dir, &fname, res_dir); /* * On success, or if the error was file not found, * return. Otherwise, fall back to doing a search the * old fashioned way. */ - if (!IS_ERR(bh) || PTR_ERR(bh) != ERR_BAD_DX_DIR) - return bh; + if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR) + goto cleanup_and_exit; dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, " "falling back\n")); } @@ -1438,8 +1430,10 @@ restart: num++; bh = ext4_getblk(NULL, dir, b++, 0); if (unlikely(IS_ERR(bh))) { - if (ra_max == 0) - return bh; + if (ra_max == 0) { + ret = bh; + goto cleanup_and_exit; + } break; } bh_use[ra_max] = bh; @@ -1469,7 +1463,7 @@ restart: goto next; } set_buffer_verified(bh); - i = search_dirblock(bh, dir, d_name, + i = search_dirblock(bh, dir, &fname, d_name, block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); if (i == 1) { EXT4_I(dir)->i_dir_start_lookup = block; @@ -1500,15 +1494,17 @@ cleanup_and_exit: /* Clean up the read-ahead blocks */ for (; ra_ptr < ra_max; ra_ptr++) brelse(bh_use[ra_ptr]); + ext4_fname_free_filename(&fname); return ret; } -static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct qstr *d_name, - struct ext4_dir_entry_2 **res_dir) +static struct buffer_head * ext4_dx_find_entry(struct inode *dir, + struct ext4_filename *fname, + struct ext4_dir_entry_2 **res_dir) { struct super_block * sb = dir->i_sb; - struct dx_hash_info hinfo; struct dx_frame frames[2], *frame; + const struct qstr *d_name = fname->usr_fname; struct buffer_head *bh; ext4_lblk_t block; int retval; @@ -1516,7 +1512,7 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q #ifdef CONFIG_EXT4_FS_ENCRYPTION *res_dir = NULL; #endif - frame = dx_probe(d_name, dir, &hinfo, frames); + frame = dx_probe(fname, dir, NULL, frames); if (IS_ERR(frame)) return (struct buffer_head *) frame; do { @@ -1525,7 +1521,7 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q if (IS_ERR(bh)) goto errout; - retval = search_dirblock(bh, dir, d_name, + retval = search_dirblock(bh, dir, fname, d_name, block << EXT4_BLOCK_SIZE_BITS(sb), res_dir); if (retval == 1) @@ -1537,12 +1533,12 @@ static struct buffer_head * ext4_dx_find_entry(struct inode *dir, const struct q } /* Check to see if we should continue to search */ - retval = ext4_htree_next_block(dir, hinfo.hash, frame, + retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame, frames, NULL); if (retval < 0) { - ext4_warning(sb, - "error %d reading index page in directory #%lu", - retval, dir->i_ino); + ext4_warning_inode(dir, + "error %d reading directory index block", + retval); bh = ERR_PTR(retval); goto errout; } @@ -1796,32 +1792,16 @@ journal_error: int ext4_find_dest_de(struct inode *dir, struct inode *inode, struct buffer_head *bh, void *buf, int buf_size, - const char *name, int namelen, + struct ext4_filename *fname, struct ext4_dir_entry_2 **dest_de) { struct ext4_dir_entry_2 *de; - unsigned short reclen = EXT4_DIR_REC_LEN(namelen); + unsigned short reclen = EXT4_DIR_REC_LEN(fname_len(fname)); int nlen, rlen; unsigned int offset = 0; char *top; - struct ext4_fname_crypto_ctx *ctx = NULL; - struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}; int res; - ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN); - if (IS_ERR(ctx)) - return -1; - - if (ctx != NULL) { - /* Calculate record length needed to store the entry */ - res = ext4_fname_crypto_namelen_on_disk(ctx, namelen); - if (res < 0) { - ext4_put_fname_crypto_ctx(&ctx); - return res; - } - reclen = EXT4_DIR_REC_LEN(res); - } - de = (struct ext4_dir_entry_2 *)buf; top = buf + buf_size - reclen; while ((char *) de <= top) { @@ -1831,7 +1811,7 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode, goto return_result; } /* Provide crypto context and crypto buffer to ext4 match */ - res = ext4_match(ctx, &fname_crypto_str, namelen, name, de); + res = ext4_match(fname, de); if (res < 0) goto return_result; if (res > 0) { @@ -1853,8 +1833,6 @@ int ext4_find_dest_de(struct inode *dir, struct inode *inode, res = 0; } return_result: - ext4_put_fname_crypto_ctx(&ctx); - ext4_fname_crypto_free_buffer(&fname_crypto_str); return res; } @@ -1862,39 +1840,10 @@ int ext4_insert_dentry(struct inode *dir, struct inode *inode, struct ext4_dir_entry_2 *de, int buf_size, - const struct qstr *iname, - const char *name, int namelen) + struct ext4_filename *fname) { int nlen, rlen; - struct ext4_fname_crypto_ctx *ctx = NULL; - struct ext4_str fname_crypto_str = {.name = NULL, .len = 0}; - struct ext4_str tmp_str; - int res; - - ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN); - if (IS_ERR(ctx)) - return -EIO; - /* By default, the input name would be written to the disk */ - tmp_str.name = (unsigned char *)name; - tmp_str.len = namelen; - if (ctx != NULL) { - /* Directory is encrypted */ - res = ext4_fname_crypto_alloc_buffer(ctx, EXT4_NAME_LEN, - &fname_crypto_str); - if (res < 0) { - ext4_put_fname_crypto_ctx(&ctx); - return -ENOMEM; - } - res = ext4_fname_usr_to_disk(ctx, iname, &fname_crypto_str); - if (res < 0) { - ext4_put_fname_crypto_ctx(&ctx); - ext4_fname_crypto_free_buffer(&fname_crypto_str); - return res; - } - tmp_str.name = fname_crypto_str.name; - tmp_str.len = fname_crypto_str.len; - } nlen = EXT4_DIR_REC_LEN(de->name_len); rlen = ext4_rec_len_from_disk(de->rec_len, buf_size); @@ -1908,11 +1857,8 @@ int ext4_insert_dentry(struct inode *dir, 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 = tmp_str.len; - - memcpy(de->name, tmp_str.name, tmp_str.len); - ext4_put_fname_crypto_ctx(&ctx); - ext4_fname_crypto_free_buffer(&fname_crypto_str); + de->name_len = fname_len(fname); + memcpy(de->name, fname_name(fname), fname_len(fname)); return 0; } @@ -1924,13 +1870,11 @@ int ext4_insert_dentry(struct inode *dir, * space. It will return -ENOSPC if no space is available, and -EIO * and -EEXIST if directory entry already exists. */ -static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, +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) { - struct inode *dir = d_inode(dentry->d_parent); - const char *name = dentry->d_name.name; - int namelen = dentry->d_name.len; unsigned int blocksize = dir->i_sb->s_blocksize; int csum_size = 0; int err; @@ -1939,9 +1883,8 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, csum_size = sizeof(struct ext4_dir_entry_tail); if (!de) { - err = ext4_find_dest_de(dir, inode, - bh, bh->b_data, blocksize - csum_size, - name, namelen, &de); + err = ext4_find_dest_de(dir, inode, bh, bh->b_data, + blocksize - csum_size, fname, &de); if (err) return err; } @@ -1954,8 +1897,7 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, /* By now the buffer is marked for journaling. Due to crypto operations, * the following function call may fail */ - err = ext4_insert_dentry(dir, inode, de, blocksize, &dentry->d_name, - name, namelen); + err = ext4_insert_dentry(dir, inode, de, blocksize, fname); if (err < 0) return err; @@ -1985,17 +1927,11 @@ static int add_dirent_to_buf(handle_t *handle, struct dentry *dentry, * This converts a one block unindexed directory to a 3 block indexed * directory, and adds the dentry to the indexed directory. */ -static int make_indexed_dir(handle_t *handle, struct dentry *dentry, +static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname, + struct dentry *dentry, struct inode *inode, struct buffer_head *bh) { struct inode *dir = d_inode(dentry->d_parent); -#ifdef CONFIG_EXT4_FS_ENCRYPTION - struct ext4_fname_crypto_ctx *ctx = NULL; - int res; -#else - const char *name = dentry->d_name.name; - int namelen = dentry->d_name.len; -#endif struct buffer_head *bh2; struct dx_root *root; struct dx_frame frames[2], *frame; @@ -2006,17 +1942,10 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry, unsigned len; int retval; unsigned blocksize; - struct dx_hash_info hinfo; ext4_lblk_t block; struct fake_dirent *fde; int csum_size = 0; -#ifdef CONFIG_EXT4_FS_ENCRYPTION - ctx = ext4_get_fname_crypto_ctx(dir, EXT4_NAME_LEN); - if (IS_ERR(ctx)) - return PTR_ERR(ctx); -#endif - if (ext4_has_metadata_csum(inode->i_sb)) csum_size = sizeof(struct ext4_dir_entry_tail); @@ -2078,22 +2007,12 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry, dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info))); /* Initialize as for dx_probe */ - 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; -#ifdef CONFIG_EXT4_FS_ENCRYPTION - res = ext4_fname_usr_to_hash(ctx, &dentry->d_name, &hinfo); - if (res < 0) { - ext4_put_fname_crypto_ctx(&ctx); - ext4_mark_inode_dirty(handle, dir); - brelse(bh); - return res; - } - ext4_put_fname_crypto_ctx(&ctx); -#else - ext4fs_dirhash(name, namelen, &hinfo); -#endif + 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; + ext4fs_dirhash(fname_name(fname), fname_len(fname), &fname->hinfo); + memset(frames, 0, sizeof(frames)); frame = frames; frame->entries = entries; @@ -2108,14 +2027,14 @@ static int make_indexed_dir(handle_t *handle, struct dentry *dentry, if (retval) goto out_frames; - de = do_split(handle,dir, &bh, frame, &hinfo); + de = do_split(handle,dir, &bh, frame, &fname->hinfo); if (IS_ERR(de)) { retval = PTR_ERR(de); goto out_frames; } dx_release(frames); - retval = add_dirent_to_buf(handle, dentry, inode, de, bh); + retval = add_dirent_to_buf(handle, fname, dir, inode, de, bh); brelse(bh); return retval; out_frames: @@ -2147,6 +2066,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, struct ext4_dir_entry_2 *de; struct ext4_dir_entry_tail *t; struct super_block *sb; + struct ext4_filename fname; int retval; int dx_fallback=0; unsigned blocksize; @@ -2161,10 +2081,15 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, if (!dentry->d_name.len) 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, dentry, inode); + retval = ext4_try_add_inline_entry(handle, &fname, + dentry, inode); if (retval < 0) - return retval; + goto out; if (retval == 1) { retval = 0; goto out; @@ -2172,7 +2097,7 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, } if (is_dx(dir)) { - retval = ext4_dx_add_entry(handle, dentry, inode); + retval = ext4_dx_add_entry(handle, &fname, dentry, inode); if (!retval || (retval != ERR_BAD_DX_DIR)) goto out; ext4_clear_inode_flag(dir, EXT4_INODE_INDEX); @@ -2182,24 +2107,31 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, blocks = dir->i_size >> sb->s_blocksize_bits; for (block = 0; block < blocks; block++) { bh = ext4_read_dirblock(dir, block, DIRENT); - if (IS_ERR(bh)) - return PTR_ERR(bh); - - retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh); + if (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_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_DIR_INDEX)) { - retval = make_indexed_dir(handle, dentry, inode, bh); + retval = make_indexed_dir(handle, &fname, dentry, + inode, bh); bh = NULL; /* make_indexed_dir releases bh */ goto out; } brelse(bh); } bh = ext4_append(handle, dir, &block); - if (IS_ERR(bh)) - return PTR_ERR(bh); + 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); @@ -2209,8 +2141,9 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry, initialize_dirent_tail(t, blocksize); } - retval = add_dirent_to_buf(handle, dentry, inode, de, bh); + 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); @@ -2220,19 +2153,18 @@ out: /* * Returns 0 for success, or a negative error value */ -static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, - struct inode *inode) +static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname, + struct dentry *dentry, struct inode *inode) { struct dx_frame frames[2], *frame; struct dx_entry *entries, *at; - struct dx_hash_info hinfo; struct buffer_head *bh; struct inode *dir = d_inode(dentry->d_parent); struct super_block *sb = dir->i_sb; struct ext4_dir_entry_2 *de; int err; - frame = dx_probe(&dentry->d_name, dir, &hinfo, frames); + frame = dx_probe(fname, dir, NULL, frames); if (IS_ERR(frame)) return PTR_ERR(frame); entries = frame->entries; @@ -2249,7 +2181,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, if (err) goto journal_error; - err = add_dirent_to_buf(handle, dentry, inode, NULL, bh); + err = add_dirent_to_buf(handle, fname, dir, inode, NULL, bh); if (err != -ENOSPC) goto cleanup; @@ -2267,7 +2199,7 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, if (levels && (dx_get_count(frames->entries) == dx_get_limit(frames->entries))) { - ext4_warning(sb, "Directory index full!"); + ext4_warning_inode(dir, "Directory index full!"); err = -ENOSPC; goto cleanup; } @@ -2345,12 +2277,12 @@ static int ext4_dx_add_entry(handle_t *handle, struct dentry *dentry, goto cleanup; } } - de = do_split(handle, dir, &bh, frame, &hinfo); + 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, dentry, inode, de, bh); + err = add_dirent_to_buf(handle, fname, dir, inode, de, bh); goto cleanup; journal_error: @@ -2517,20 +2449,7 @@ retry: inode->i_op = &ext4_file_inode_operations; inode->i_fop = &ext4_file_operations; ext4_set_aops(inode); - err = 0; -#ifdef CONFIG_EXT4_FS_ENCRYPTION - if (!err && (ext4_encrypted_inode(dir) || - DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb)))) { - err = ext4_inherit_context(dir, inode); - if (err) { - clear_nlink(inode); - unlock_new_inode(inode); - iput(inode); - } - } -#endif - if (!err) - err = ext4_add_nondir(handle, dentry, inode); + err = ext4_add_nondir(handle, dentry, inode); if (!err && IS_DIRSYNC(dir)) ext4_handle_sync(handle); } @@ -2711,14 +2630,6 @@ retry: err = ext4_init_new_dir(handle, dir, inode); if (err) goto out_clear_inode; -#ifdef CONFIG_EXT4_FS_ENCRYPTION - if (ext4_encrypted_inode(dir) || - DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))) { - err = ext4_inherit_context(dir, inode); - if (err) - goto out_clear_inode; - } -#endif err = ext4_mark_inode_dirty(handle, inode); if (!err) err = ext4_add_entry(handle, dentry, inode); @@ -2779,12 +2690,9 @@ int ext4_empty_dir(struct inode *inode) de = (struct ext4_dir_entry_2 *) bh->b_data; de1 = ext4_next_entry(de, sb->s_blocksize); if (le32_to_cpu(de->inode) != inode->i_ino || - !le32_to_cpu(de1->inode) || - strcmp(".", de->name) || - strcmp("..", de1->name)) { - ext4_warning(inode->i_sb, - "bad directory (dir #%lu) - no `.' or `..'", - inode->i_ino); + le32_to_cpu(de1->inode) == 0 || + strcmp(".", de->name) || strcmp("..", de1->name)) { + ext4_warning_inode(inode, "directory missing '.' and/or '..'"); brelse(bh); return 1; } @@ -3037,8 +2945,9 @@ static int ext4_rmdir(struct inode *dir, struct dentry *dentry) if (retval) goto end_rmdir; if (!EXT4_DIR_LINK_EMPTY(inode)) - ext4_warning(inode->i_sb, - "empty directory has too many links (%d)", + ext4_warning_inode(inode, + "empty directory '%.*s' has too many links (%u)", + dentry->d_name.len, dentry->d_name.name, inode->i_nlink); inode->i_version++; clear_nlink(inode); @@ -3098,10 +3007,9 @@ static int ext4_unlink(struct inode *dir, struct dentry *dentry) if (IS_DIRSYNC(dir)) ext4_handle_sync(handle); - if (!inode->i_nlink) { - ext4_warning(inode->i_sb, - "Deleting nonexistent file (%lu), %d", - inode->i_ino, inode->i_nlink); + if (inode->i_nlink == 0) { + ext4_warning_inode(inode, "Deleting file '%.*s' with no links", + dentry->d_name.len, dentry->d_name.name); set_nlink(inode, 1); } retval = ext4_delete_entry(handle, dir, de, bh); @@ -3140,10 +3048,23 @@ static int ext4_symlink(struct inode *dir, encryption_required = (ext4_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(EXT4_SB(dir->i_sb))); - if (encryption_required) - disk_link.len = encrypted_symlink_data_len(len) + 1; - if (disk_link.len > dir->i_sb->s_blocksize) - return -ENAMETOOLONG; + if (encryption_required) { + err = ext4_get_encryption_info(dir); + if (err) + return err; + if (ext4_encryption_info(dir) == NULL) + return -EPERM; + disk_link.len = (ext4_fname_encrypted_size(dir, len) + + sizeof(struct ext4_encrypted_symlink_data)); + sd = kzalloc(disk_link.len, GFP_KERNEL); + if (!sd) + return -ENOMEM; + } + + if (disk_link.len > dir->i_sb->s_blocksize) { + err = -ENAMETOOLONG; + goto err_free_sd; + } dquot_initialize(dir); @@ -3174,42 +3095,29 @@ static int ext4_symlink(struct inode *dir, if (IS_ERR(inode)) { if (handle) ext4_journal_stop(handle); - return PTR_ERR(inode); + err = PTR_ERR(inode); + goto err_free_sd; } if (encryption_required) { - struct ext4_fname_crypto_ctx *ctx = NULL; struct qstr istr; struct ext4_str ostr; - sd = kzalloc(disk_link.len, GFP_NOFS); - if (!sd) { - err = -ENOMEM; - goto err_drop_inode; - } - err = ext4_inherit_context(dir, inode); - if (err) - goto err_drop_inode; - ctx = ext4_get_fname_crypto_ctx(inode, - inode->i_sb->s_blocksize); - if (IS_ERR_OR_NULL(ctx)) { - /* We just set the policy, so ctx should not be NULL */ - err = (ctx == NULL) ? -EIO : PTR_ERR(ctx); - goto err_drop_inode; - } istr.name = (const unsigned char *) symname; istr.len = len; ostr.name = sd->encrypted_path; - err = ext4_fname_usr_to_disk(ctx, &istr, &ostr); - ext4_put_fname_crypto_ctx(&ctx); + ostr.len = disk_link.len; + err = ext4_fname_usr_to_disk(inode, &istr, &ostr); if (err < 0) goto err_drop_inode; sd->len = cpu_to_le16(ostr.len); disk_link.name = (char *) sd; + inode->i_op = &ext4_encrypted_symlink_inode_operations; } if ((disk_link.len > EXT4_N_BLOCKS * 4)) { - inode->i_op = &ext4_symlink_inode_operations; + if (!encryption_required) + inode->i_op = &ext4_symlink_inode_operations; ext4_set_aops(inode); /* * We cannot call page_symlink() with transaction started @@ -3249,9 +3157,10 @@ static int ext4_symlink(struct inode *dir, } else { /* clear the extent format for fast symlink */ ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS); - inode->i_op = encryption_required ? - &ext4_symlink_inode_operations : - &ext4_fast_symlink_inode_operations; + if (!encryption_required) { + inode->i_op = &ext4_fast_symlink_inode_operations; + inode->i_link = (char *)&EXT4_I(inode)->i_data; + } memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name, disk_link.len); inode->i_size = disk_link.len - 1; @@ -3268,10 +3177,11 @@ static int ext4_symlink(struct inode *dir, err_drop_inode: if (handle) ext4_journal_stop(handle); - kfree(sd); clear_nlink(inode); unlock_new_inode(inode); iput(inode); +err_free_sd: + kfree(sd); return err; } @@ -3487,9 +3397,9 @@ static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent, } if (retval) { - ext4_warning(ent->dir->i_sb, - "Deleting old file (%lu), %d, error=%d", - ent->dir->i_ino, ent->dir->i_nlink, retval); + ext4_warning_inode(ent->dir, + "Deleting old file: nlink %d, error=%d", + ent->dir->i_nlink, retval); } } @@ -3759,6 +3669,15 @@ static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry, u8 new_file_type; int retval; + if ((ext4_encrypted_inode(old_dir) || + ext4_encrypted_inode(new_dir)) && + (old_dir != new_dir) && + (!ext4_is_child_context_consistent_with_parent(new_dir, + old.inode) || + !ext4_is_child_context_consistent_with_parent(old_dir, + new.inode))) + return -EPERM; + dquot_initialize(old.dir); dquot_initialize(new.dir); |