2013-12-06 13:57:58 +04:00
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/*
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* inline_data.c --- data in inode
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*
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* Copyright (C) 2012 Zheng Liu <wenqing.lz@taobao.com>
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*
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* %Begin-Header%
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* This file may be redistributed under the terms of the GNU library
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* General Public License, version 2.
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* %End-Header%
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*/
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#include "config.h"
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#include <stdio.h>
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#include <time.h>
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#include "ext2_fs.h"
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#include "ext2_ext_attr.h"
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#include "ext2fs.h"
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#include "ext2fsP.h"
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struct ext2_inline_data {
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ext2_filsys fs;
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ext2_ino_t ino;
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size_t ea_size; /* the size of inline data in ea area */
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void *ea_data;
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};
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static errcode_t ext2fs_inline_data_ea_set(struct ext2_inline_data *data)
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{
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struct ext2_xattr_handle *handle;
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errcode_t retval;
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retval = ext2fs_xattrs_open(data->fs, data->ino, &handle);
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if (retval)
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return retval;
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retval = ext2fs_xattrs_read(handle);
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if (retval)
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goto err;
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retval = ext2fs_xattr_set(handle, "system.data",
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data->ea_data, data->ea_size);
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if (retval)
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goto err;
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retval = ext2fs_xattrs_write(handle);
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err:
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(void) ext2fs_xattrs_close(&handle);
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return retval;
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}
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static errcode_t ext2fs_inline_data_ea_get(struct ext2_inline_data *data)
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{
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struct ext2_xattr_handle *handle;
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errcode_t retval;
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data->ea_size = 0;
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data->ea_data = 0;
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retval = ext2fs_xattrs_open(data->fs, data->ino, &handle);
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if (retval)
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return retval;
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retval = ext2fs_xattrs_read(handle);
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if (retval)
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goto err;
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retval = ext2fs_xattr_get(handle, "system.data",
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(void **)&data->ea_data, &data->ea_size);
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if (retval)
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goto err;
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err:
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(void) ext2fs_xattrs_close(&handle);
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return retval;
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}
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2014-03-03 09:31:26 +04:00
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errcode_t ext2fs_inline_data_size(ext2_filsys fs, ext2_ino_t ino, size_t *size)
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{
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struct ext2_inode inode;
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struct ext2_inline_data data;
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errcode_t retval;
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retval = ext2fs_read_inode(fs, ino, &inode);
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if (retval)
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return retval;
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if (!(inode.i_flags & EXT4_INLINE_DATA_FL))
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return EXT2_ET_NO_INLINE_DATA;
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data.fs = fs;
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data.ino = ino;
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retval = ext2fs_inline_data_ea_get(&data);
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if (retval)
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return retval;
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*size = EXT4_MIN_INLINE_DATA_SIZE + data.ea_size;
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return ext2fs_free_mem(&data.ea_data);
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}
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2013-12-06 13:57:58 +04:00
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int ext2fs_inline_data_dir_iterate(ext2_filsys fs, ext2_ino_t ino,
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void *priv_data)
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{
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struct dir_context *ctx;
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struct ext2_inode inode;
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struct ext2_dir_entry dirent;
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struct ext2_inline_data data;
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int ret = BLOCK_ABORT;
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e2_blkcnt_t blockcnt = 0;
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ctx = (struct dir_context *)priv_data;
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ctx->errcode = ext2fs_read_inode(fs, ino, &inode);
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if (ctx->errcode)
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goto out;
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if (!(inode.i_flags & EXT4_INLINE_DATA_FL)) {
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ctx->errcode = EXT2_ET_NO_INLINE_DATA;
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goto out;
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}
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if (!LINUX_S_ISDIR(inode.i_mode)) {
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ctx->errcode = EXT2_ET_NO_DIRECTORY;
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goto out;
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}
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ret = 0;
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/* we first check '.' and '..' dir */
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dirent.inode = ino;
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dirent.name_len = 1;
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ext2fs_set_rec_len(fs, EXT2_DIR_REC_LEN(2), &dirent);
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dirent.name[0] = '.';
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dirent.name[1] = '\0';
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ctx->buf = (char *)&dirent;
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ext2fs_get_rec_len(fs, &dirent, &ctx->buflen);
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ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
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if (ret & BLOCK_ABORT)
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goto out;
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dirent.inode = ext2fs_le32_to_cpu(inode.i_block[0]);
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dirent.name_len = 2;
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ext2fs_set_rec_len(fs, EXT2_DIR_REC_LEN(3), &dirent);
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dirent.name[0] = '.';
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dirent.name[1] = '.';
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dirent.name[2] = '\0';
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ctx->buf = (char *)&dirent;
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ext2fs_get_rec_len(fs, &dirent, &ctx->buflen);
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ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
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if (ret & BLOCK_INLINE_DATA_CHANGED) {
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errcode_t err;
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inode.i_block[0] = ext2fs_cpu_to_le32(dirent.inode);
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err = ext2fs_write_inode(fs, ino, &inode);
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if (err)
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goto out;
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ret &= ~BLOCK_INLINE_DATA_CHANGED;
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}
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if (ret & BLOCK_ABORT)
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goto out;
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ctx->buf = (char *)inode.i_block + EXT4_INLINE_DATA_DOTDOT_SIZE;
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ctx->buflen = EXT4_MIN_INLINE_DATA_SIZE - EXT4_INLINE_DATA_DOTDOT_SIZE;
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#ifdef WORDS_BIGENDIAN
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ctx->errcode = ext2fs_dirent_swab_in2(fs, ctx->buf, ctx->buflen, 0);
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if (ctx->errcode) {
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ret |= BLOCK_ABORT;
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goto out;
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}
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#endif
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ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
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if (ret & BLOCK_INLINE_DATA_CHANGED) {
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#ifdef WORDS_BIGENDIAN
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ctx->errcode = ext2fs_dirent_swab_out2(fs, ctx->buf,
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ctx->buflen, 0);
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if (ctx->errcode) {
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ret |= BLOCK_ABORT;
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goto out;
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}
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#endif
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ctx->errcode = ext2fs_write_inode(fs, ino, &inode);
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if (ctx->errcode)
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ret |= BLOCK_ABORT;
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ret &= ~BLOCK_INLINE_DATA_CHANGED;
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}
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if (ret & BLOCK_ABORT)
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goto out;
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data.fs = fs;
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data.ino = ino;
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ctx->errcode = ext2fs_inline_data_ea_get(&data);
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if (ctx->errcode) {
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ret |= BLOCK_ABORT;
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goto out;
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}
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if (data.ea_size <= 0)
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goto out;
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ctx->buf = data.ea_data;
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ctx->buflen = data.ea_size;
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#ifdef WORDS_BIGENDIAN
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ctx.errcode = ext2fs_dirent_swab_in2(fs, ctx->buf, ctx->buflen, 0);
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if (ctx.errcode) {
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ret |= BLOCK_ABORT;
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goto out;
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}
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#endif
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ret |= ext2fs_process_dir_block(fs, 0, blockcnt++, 0, 0, priv_data);
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if (ret & BLOCK_INLINE_DATA_CHANGED) {
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#ifdef WORDS_BIGENDIAN
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ctx->errcode = ext2fs_dirent_swab_out2(fs, ctx->buf,
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ctx->buflen, 0);
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if (ctx->errcode) {
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ret |= BLOCK_ABORT;
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goto out1;
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}
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#endif
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ctx->errcode = ext2fs_inline_data_ea_set(&data);
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if (ctx->errcode)
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ret |= BLOCK_ABORT;
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}
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out1:
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ext2fs_free_mem(&data.ea_data);
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ctx->buf = 0;
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out:
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ret &= ~(BLOCK_ABORT | BLOCK_INLINE_DATA_CHANGED);
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return ret;
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}
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