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udf: refactor udf_next_aext() to handle error
Since udf_current_aext() has error handling, udf_next_aext() should have error handling too. Besides, when too many indirect extents found in one inode, return -EFSCORRUPTED; when reading block failed, return -EIO. Signed-off-by: Zhao Mengmeng <zhaomengmeng@kylinos.cn> Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://patch.msgid.link/20241001115425.266556-3-zhaomzhao@126.com
This commit is contained in:
Zhao Mengmeng
Jan Kara
parent
ee703a7068
commit
b405c1e58b
@ -370,6 +370,7 @@ static void udf_table_free_blocks(struct super_block *sb,
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struct extent_position oepos, epos;
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int8_t etype;
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struct udf_inode_info *iinfo;
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int ret = 0;
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mutex_lock(&sbi->s_alloc_mutex);
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iinfo = UDF_I(table);
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@ -383,8 +384,12 @@ static void udf_table_free_blocks(struct super_block *sb,
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epos.block = oepos.block = iinfo->i_location;
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epos.bh = oepos.bh = NULL;
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while (count &&
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(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
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while (count) {
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ret = udf_next_aext(table, &epos, &eloc, &elen, &etype, 1);
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if (ret < 0)
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goto error_return;
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if (ret == 0)
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break;
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if (((eloc.logicalBlockNum +
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(elen >> sb->s_blocksize_bits)) == start)) {
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if ((0x3FFFFFFF - elen) <
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@ -459,11 +464,8 @@ static void udf_table_free_blocks(struct super_block *sb,
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adsize = sizeof(struct short_ad);
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else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
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adsize = sizeof(struct long_ad);
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else {
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brelse(oepos.bh);
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brelse(epos.bh);
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else
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goto error_return;
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}
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if (epos.offset + (2 * adsize) > sb->s_blocksize) {
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/* Steal a block from the extent being free'd */
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@ -479,10 +481,10 @@ static void udf_table_free_blocks(struct super_block *sb,
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__udf_add_aext(table, &epos, &eloc, elen, 1);
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}
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error_return:
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brelse(epos.bh);
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brelse(oepos.bh);
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error_return:
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mutex_unlock(&sbi->s_alloc_mutex);
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return;
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}
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@ -498,6 +500,7 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
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struct extent_position epos;
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int8_t etype = -1;
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struct udf_inode_info *iinfo;
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int ret = 0;
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if (first_block >= sbi->s_partmaps[partition].s_partition_len)
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return 0;
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@ -516,11 +519,14 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
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epos.bh = NULL;
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eloc.logicalBlockNum = 0xFFFFFFFF;
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while (first_block != eloc.logicalBlockNum &&
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(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
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while (first_block != eloc.logicalBlockNum) {
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ret = udf_next_aext(table, &epos, &eloc, &elen, &etype, 1);
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if (ret < 0)
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goto err_out;
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if (ret == 0)
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break;
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udf_debug("eloc=%u, elen=%u, first_block=%u\n",
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eloc.logicalBlockNum, elen, first_block);
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; /* empty loop body */
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}
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if (first_block == eloc.logicalBlockNum) {
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@ -539,6 +545,7 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
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alloc_count = 0;
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}
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err_out:
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brelse(epos.bh);
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if (alloc_count)
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@ -560,6 +567,7 @@ static udf_pblk_t udf_table_new_block(struct super_block *sb,
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struct extent_position epos, goal_epos;
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int8_t etype;
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struct udf_inode_info *iinfo = UDF_I(table);
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int ret = 0;
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*err = -ENOSPC;
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@ -583,8 +591,10 @@ static udf_pblk_t udf_table_new_block(struct super_block *sb,
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epos.block = iinfo->i_location;
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epos.bh = goal_epos.bh = NULL;
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while (spread &&
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(etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
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while (spread) {
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ret = udf_next_aext(table, &epos, &eloc, &elen, &etype, 1);
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if (ret <= 0)
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break;
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if (goal >= eloc.logicalBlockNum) {
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if (goal < eloc.logicalBlockNum +
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(elen >> sb->s_blocksize_bits))
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@ -612,9 +622,11 @@ static udf_pblk_t udf_table_new_block(struct super_block *sb,
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brelse(epos.bh);
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if (spread == 0xFFFFFFFF) {
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if (ret < 0 || spread == 0xFFFFFFFF) {
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brelse(goal_epos.bh);
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mutex_unlock(&sbi->s_alloc_mutex);
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if (ret < 0)
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*err = ret;
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return 0;
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}
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@ -166,13 +166,19 @@ static struct buffer_head *udf_fiiter_bread_blk(struct udf_fileident_iter *iter)
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*/
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static int udf_fiiter_advance_blk(struct udf_fileident_iter *iter)
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{
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int8_t etype = -1;
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int err = 0;
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iter->loffset++;
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if (iter->loffset < DIV_ROUND_UP(iter->elen, 1<<iter->dir->i_blkbits))
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return 0;
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iter->loffset = 0;
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if (udf_next_aext(iter->dir, &iter->epos, &iter->eloc, &iter->elen, 1)
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!= (EXT_RECORDED_ALLOCATED >> 30)) {
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err = udf_next_aext(iter->dir, &iter->epos, &iter->eloc,
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&iter->elen, &etype, 1);
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if (err < 0)
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return err;
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else if (err == 0 || etype != (EXT_RECORDED_ALLOCATED >> 30)) {
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if (iter->pos == iter->dir->i_size) {
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iter->elen = 0;
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return 0;
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121
fs/udf/inode.c
121
fs/udf/inode.c
@ -543,6 +543,7 @@ static int udf_do_extend_file(struct inode *inode,
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} else {
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struct kernel_lb_addr tmploc;
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uint32_t tmplen;
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int8_t tmptype;
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udf_write_aext(inode, last_pos, &last_ext->extLocation,
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last_ext->extLength, 1);
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@ -552,8 +553,12 @@ static int udf_do_extend_file(struct inode *inode,
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* more extents, we may need to enter possible following
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* empty indirect extent.
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*/
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if (new_block_bytes)
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udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
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if (new_block_bytes) {
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err = udf_next_aext(inode, last_pos, &tmploc, &tmplen,
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&tmptype, 0);
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if (err < 0)
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goto out_err;
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}
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}
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iinfo->i_lenExtents += add;
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@ -672,8 +677,10 @@ static int udf_extend_file(struct inode *inode, loff_t newsize)
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extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
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} else {
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epos.offset -= adsize;
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etype = udf_next_aext(inode, &epos, &extent.extLocation,
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&extent.extLength, 0);
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err = udf_next_aext(inode, &epos, &extent.extLocation,
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&extent.extLength, &etype, 0);
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if (err <= 0)
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goto out;
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extent.extLength |= etype << 30;
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}
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@ -710,11 +717,11 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
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loff_t lbcount = 0, b_off = 0;
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udf_pblk_t newblocknum;
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sector_t offset = 0;
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int8_t etype;
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int8_t etype, tmpetype;
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struct udf_inode_info *iinfo = UDF_I(inode);
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udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
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int lastblock = 0;
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bool isBeyondEOF;
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bool isBeyondEOF = false;
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int ret = 0;
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prev_epos.offset = udf_file_entry_alloc_offset(inode);
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@ -746,9 +753,13 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
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prev_epos.offset = cur_epos.offset;
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cur_epos.offset = next_epos.offset;
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etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
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if (etype == -1)
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ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 1);
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if (ret < 0) {
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goto out_free;
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} else if (ret == 0) {
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isBeyondEOF = true;
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break;
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}
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c = !c;
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@ -769,13 +780,17 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
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* Move prev_epos and cur_epos into indirect extent if we are at
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* the pointer to it
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*/
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udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
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udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
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ret = udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
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if (ret < 0)
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goto out_free;
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ret = udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
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if (ret < 0)
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goto out_free;
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/* if the extent is allocated and recorded, return the block
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if the extent is not a multiple of the blocksize, round up */
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if (etype == (EXT_RECORDED_ALLOCATED >> 30)) {
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if (!isBeyondEOF && etype == (EXT_RECORDED_ALLOCATED >> 30)) {
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if (elen & (inode->i_sb->s_blocksize - 1)) {
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elen = EXT_RECORDED_ALLOCATED |
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((elen + inode->i_sb->s_blocksize - 1) &
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@ -791,10 +806,9 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
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}
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/* Are we beyond EOF and preallocated extent? */
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if (etype == -1) {
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if (isBeyondEOF) {
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loff_t hole_len;
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isBeyondEOF = true;
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if (count) {
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if (c)
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laarr[0] = laarr[1];
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@ -830,7 +844,6 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
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endnum = c + 1;
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lastblock = 1;
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} else {
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isBeyondEOF = false;
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endnum = startnum = ((count > 2) ? 2 : count);
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/* if the current extent is in position 0,
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@ -844,15 +857,17 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
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/* if the current block is located in an extent,
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read the next extent */
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etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
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if (etype != -1) {
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ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 0);
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if (ret > 0) {
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laarr[c + 1].extLength = (etype << 30) | elen;
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laarr[c + 1].extLocation = eloc;
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count++;
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startnum++;
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endnum++;
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} else
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} else if (ret == 0)
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lastblock = 1;
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else
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goto out_free;
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}
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/* if the current extent is not recorded but allocated, get the
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@ -1170,6 +1185,7 @@ static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
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int start = 0, i;
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struct kernel_lb_addr tmploc;
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uint32_t tmplen;
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int8_t tmpetype;
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int err;
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if (startnum > endnum) {
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@ -1187,14 +1203,19 @@ static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
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*/
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if (err < 0)
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return err;
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udf_next_aext(inode, epos, &laarr[i].extLocation,
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&laarr[i].extLength, 1);
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err = udf_next_aext(inode, epos, &laarr[i].extLocation,
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&laarr[i].extLength, &tmpetype, 1);
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if (err < 0)
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return err;
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start++;
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}
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}
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for (i = start; i < endnum; i++) {
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udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
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err = udf_next_aext(inode, epos, &tmploc, &tmplen, &tmpetype, 0);
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if (err < 0)
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return err;
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udf_write_aext(inode, epos, &laarr[i].extLocation,
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laarr[i].extLength, 1);
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}
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@ -2166,24 +2187,30 @@ void udf_write_aext(struct inode *inode, struct extent_position *epos,
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*/
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#define UDF_MAX_INDIR_EXTS 16
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int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
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struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
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/*
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* Returns 1 on success, -errno on error, 0 on hit EOF.
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*/
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int udf_next_aext(struct inode *inode, struct extent_position *epos,
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struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype,
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int inc)
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{
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int8_t etype;
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unsigned int indirections = 0;
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int ret = 0;
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while ((ret = udf_current_aext(inode, epos, eloc, elen,
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&etype, inc)) > 0) {
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if (etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30))
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break;
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udf_pblk_t block;
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while (1) {
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ret = udf_current_aext(inode, epos, eloc, elen,
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etype, inc);
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if (ret <= 0)
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return ret;
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if (*etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30))
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return ret;
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if (++indirections > UDF_MAX_INDIR_EXTS) {
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udf_err(inode->i_sb,
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"too many indirect extents in inode %lu\n",
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inode->i_ino);
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return -1;
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return -EFSCORRUPTED;
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}
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epos->block = *eloc;
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@ -2193,11 +2220,9 @@ int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
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epos->bh = sb_bread(inode->i_sb, block);
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if (!epos->bh) {
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udf_debug("reading block %u failed!\n", block);
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return -1;
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return -EIO;
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}
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}
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return ret > 0 ? etype : -1;
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}
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/*
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@ -2263,20 +2288,24 @@ static int udf_insert_aext(struct inode *inode, struct extent_position epos,
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struct kernel_lb_addr oeloc;
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uint32_t oelen;
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int8_t etype;
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int err;
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int ret;
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if (epos.bh)
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get_bh(epos.bh);
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while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
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while (1) {
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ret = udf_next_aext(inode, &epos, &oeloc, &oelen, &etype, 0);
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if (ret <= 0)
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break;
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udf_write_aext(inode, &epos, &neloc, nelen, 1);
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neloc = oeloc;
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nelen = (etype << 30) | oelen;
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}
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err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
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if (ret == 0)
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ret = udf_add_aext(inode, &epos, &neloc, nelen, 1);
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brelse(epos.bh);
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return err;
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return ret;
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}
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int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
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@ -2288,6 +2317,7 @@ int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
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struct udf_inode_info *iinfo;
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struct kernel_lb_addr eloc;
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uint32_t elen;
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int ret;
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if (epos.bh) {
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get_bh(epos.bh);
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@ -2303,10 +2333,18 @@ int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
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adsize = 0;
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oepos = epos;
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if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
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if (udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1) <= 0)
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return -1;
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while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
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while (1) {
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ret = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1);
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if (ret < 0) {
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brelse(epos.bh);
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brelse(oepos.bh);
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return -1;
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}
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if (ret == 0)
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break;
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udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
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if (oepos.bh != epos.bh) {
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oepos.block = epos.block;
|
||||
@ -2371,6 +2409,7 @@ int8_t inode_bmap(struct inode *inode, sector_t block,
|
||||
loff_t lbcount = 0, bcount = (loff_t) block << blocksize_bits;
|
||||
int8_t etype;
|
||||
struct udf_inode_info *iinfo;
|
||||
int err = 0;
|
||||
|
||||
iinfo = UDF_I(inode);
|
||||
if (!udf_read_extent_cache(inode, bcount, &lbcount, pos)) {
|
||||
@ -2380,10 +2419,12 @@ int8_t inode_bmap(struct inode *inode, sector_t block,
|
||||
}
|
||||
*elen = 0;
|
||||
do {
|
||||
etype = udf_next_aext(inode, pos, eloc, elen, 1);
|
||||
if (etype == -1) {
|
||||
err = udf_next_aext(inode, pos, eloc, elen, &etype, 1);
|
||||
if (err <= 0) {
|
||||
if (err == 0) {
|
||||
*offset = (bcount - lbcount) >> blocksize_bits;
|
||||
iinfo->i_lenExtents = lbcount;
|
||||
}
|
||||
return -1;
|
||||
}
|
||||
lbcount += *elen;
|
||||
|
||||
@ -2482,13 +2482,14 @@ static unsigned int udf_count_free_table(struct super_block *sb,
|
||||
uint32_t elen;
|
||||
struct kernel_lb_addr eloc;
|
||||
struct extent_position epos;
|
||||
int8_t etype;
|
||||
|
||||
mutex_lock(&UDF_SB(sb)->s_alloc_mutex);
|
||||
epos.block = UDF_I(table)->i_location;
|
||||
epos.offset = sizeof(struct unallocSpaceEntry);
|
||||
epos.bh = NULL;
|
||||
|
||||
while (udf_next_aext(table, &epos, &eloc, &elen, 1) != -1)
|
||||
while (udf_next_aext(table, &epos, &eloc, &elen, &etype, 1) > 0)
|
||||
accum += (elen >> table->i_sb->s_blocksize_bits);
|
||||
|
||||
brelse(epos.bh);
|
||||
|
||||
@ -69,6 +69,7 @@ void udf_truncate_tail_extent(struct inode *inode)
|
||||
int8_t etype = -1, netype;
|
||||
int adsize;
|
||||
struct udf_inode_info *iinfo = UDF_I(inode);
|
||||
int ret;
|
||||
|
||||
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
|
||||
inode->i_size == iinfo->i_lenExtents)
|
||||
@ -85,7 +86,10 @@ void udf_truncate_tail_extent(struct inode *inode)
|
||||
BUG();
|
||||
|
||||
/* Find the last extent in the file */
|
||||
while ((netype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
|
||||
while (1) {
|
||||
ret = udf_next_aext(inode, &epos, &eloc, &elen, &netype, 1);
|
||||
if (ret <= 0)
|
||||
break;
|
||||
etype = netype;
|
||||
lbcount += elen;
|
||||
if (lbcount > inode->i_size) {
|
||||
@ -101,7 +105,8 @@ void udf_truncate_tail_extent(struct inode *inode)
|
||||
epos.offset -= adsize;
|
||||
extent_trunc(inode, &epos, &eloc, etype, elen, nelen);
|
||||
epos.offset += adsize;
|
||||
if (udf_next_aext(inode, &epos, &eloc, &elen, 1) != -1)
|
||||
if (udf_next_aext(inode, &epos, &eloc, &elen,
|
||||
&netype, 1) > 0)
|
||||
udf_err(inode->i_sb,
|
||||
"Extent after EOF in inode %u\n",
|
||||
(unsigned)inode->i_ino);
|
||||
@ -110,6 +115,7 @@ void udf_truncate_tail_extent(struct inode *inode)
|
||||
}
|
||||
/* This inode entry is in-memory only and thus we don't have to mark
|
||||
* the inode dirty */
|
||||
if (ret == 0)
|
||||
iinfo->i_lenExtents = inode->i_size;
|
||||
brelse(epos.bh);
|
||||
}
|
||||
@ -124,6 +130,8 @@ void udf_discard_prealloc(struct inode *inode)
|
||||
int8_t etype = -1;
|
||||
struct udf_inode_info *iinfo = UDF_I(inode);
|
||||
int bsize = i_blocksize(inode);
|
||||
int8_t tmpetype = -1;
|
||||
int ret;
|
||||
|
||||
if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
|
||||
ALIGN(inode->i_size, bsize) == ALIGN(iinfo->i_lenExtents, bsize))
|
||||
@ -132,15 +140,23 @@ void udf_discard_prealloc(struct inode *inode)
|
||||
epos.block = iinfo->i_location;
|
||||
|
||||
/* Find the last extent in the file */
|
||||
while (udf_next_aext(inode, &epos, &eloc, &elen, 0) != -1) {
|
||||
while (1) {
|
||||
ret = udf_next_aext(inode, &epos, &eloc, &elen, &tmpetype, 0);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
if (ret == 0)
|
||||
break;
|
||||
brelse(prev_epos.bh);
|
||||
prev_epos = epos;
|
||||
if (prev_epos.bh)
|
||||
get_bh(prev_epos.bh);
|
||||
|
||||
etype = udf_next_aext(inode, &epos, &eloc, &elen, 1);
|
||||
ret = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1);
|
||||
if (ret < 0)
|
||||
goto out;
|
||||
lbcount += elen;
|
||||
}
|
||||
|
||||
if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
|
||||
lbcount -= elen;
|
||||
udf_delete_aext(inode, prev_epos);
|
||||
@ -150,6 +166,7 @@ void udf_discard_prealloc(struct inode *inode)
|
||||
/* This inode entry is in-memory only and thus we don't have to mark
|
||||
* the inode dirty */
|
||||
iinfo->i_lenExtents = lbcount;
|
||||
out:
|
||||
brelse(epos.bh);
|
||||
brelse(prev_epos.bh);
|
||||
}
|
||||
|
||||
@ -169,8 +169,9 @@ extern int udf_add_aext(struct inode *, struct extent_position *,
|
||||
extern void udf_write_aext(struct inode *, struct extent_position *,
|
||||
struct kernel_lb_addr *, uint32_t, int);
|
||||
extern int8_t udf_delete_aext(struct inode *, struct extent_position);
|
||||
extern int8_t udf_next_aext(struct inode *, struct extent_position *,
|
||||
struct kernel_lb_addr *, uint32_t *, int);
|
||||
extern int udf_next_aext(struct inode *inode, struct extent_position *epos,
|
||||
struct kernel_lb_addr *eloc, uint32_t *elen,
|
||||
int8_t *etype, int inc);
|
||||
extern int udf_current_aext(struct inode *inode, struct extent_position *epos,
|
||||
struct kernel_lb_addr *eloc, uint32_t *elen,
|
||||
int8_t *etype, int inc);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user