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Message-ID: <20240927120614.gui56kr2t24htwba@quack3>
Date: Fri, 27 Sep 2024 14:06:14 +0200
From: Jan Kara <jack@...e.cz>
To: Zhao Mengmeng <zhaomzhao@....com>
Cc: jack@...e.com, zhaomengmeng@...inos.cn, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] udf: refactor udf_next_aext() to handle error
On Thu 26-09-24 20:07:52, Zhao Mengmeng wrote:
> From: Zhao Mengmeng <zhaomengmeng@...inos.cn>
>
> 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@...inos.cn>
> Suggested-by: Jan Kara <jack@...e.cz>
This patch looks good to me now.
Honza
> ---
> fs/udf/balloc.c | 22 +++++++----
> fs/udf/directory.c | 10 ++++-
> fs/udf/inode.c | 99 ++++++++++++++++++++++++++++++----------------
> fs/udf/super.c | 3 +-
> fs/udf/truncate.c | 23 ++++++++---
> fs/udf/udfdecl.h | 5 ++-
> 6 files changed, 110 insertions(+), 52 deletions(-)
>
> diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
> index d8fc11765d61..99cf8fbc805e 100644
> --- a/fs/udf/balloc.c
> +++ b/fs/udf/balloc.c
> @@ -370,6 +370,7 @@ static void udf_table_free_blocks(struct super_block *sb,
> struct extent_position oepos, epos;
> int8_t etype;
> struct udf_inode_info *iinfo;
> + int err = 0;
>
> mutex_lock(&sbi->s_alloc_mutex);
> iinfo = UDF_I(table);
> @@ -384,7 +385,7 @@ static void udf_table_free_blocks(struct super_block *sb,
> epos.bh = oepos.bh = NULL;
>
> while (count &&
> - (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
> + !(err = udf_next_aext(table, &epos, &eloc, &elen, &etype, 1))) {
> if (((eloc.logicalBlockNum +
> (elen >> sb->s_blocksize_bits)) == start)) {
> if ((0x3FFFFFFF - elen) <
> @@ -435,6 +436,9 @@ static void udf_table_free_blocks(struct super_block *sb,
> }
> }
>
> + if (UDF_EXT_ERR(err))
> + goto error_return;
> +
> if (count) {
> /*
> * NOTE: we CANNOT use udf_add_aext here, as it can try to
> @@ -460,8 +464,6 @@ static void udf_table_free_blocks(struct super_block *sb,
> else if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_LONG)
> adsize = sizeof(struct long_ad);
> else {
> - brelse(oepos.bh);
> - brelse(epos.bh);
> goto error_return;
> }
>
> @@ -479,10 +481,10 @@ static void udf_table_free_blocks(struct super_block *sb,
> __udf_add_aext(table, &epos, &eloc, elen, 1);
> }
>
> +error_return:
> brelse(epos.bh);
> brelse(oepos.bh);
>
> -error_return:
> mutex_unlock(&sbi->s_alloc_mutex);
> return;
> }
> @@ -498,6 +500,7 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
> struct extent_position epos;
> int8_t etype = -1;
> struct udf_inode_info *iinfo;
> + int err = 0;
>
> if (first_block >= sbi->s_partmaps[partition].s_partition_len)
> return 0;
> @@ -517,12 +520,15 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
> eloc.logicalBlockNum = 0xFFFFFFFF;
>
> while (first_block != eloc.logicalBlockNum &&
> - (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
> + !(err = udf_next_aext(table, &epos, &eloc, &elen, &etype, 1))) {
> udf_debug("eloc=%u, elen=%u, first_block=%u\n",
> eloc.logicalBlockNum, elen, first_block);
> ; /* empty loop body */
> }
>
> + if (UDF_EXT_ERR(err))
> + goto err_out;
> +
> if (first_block == eloc.logicalBlockNum) {
> epos.offset -= adsize;
>
> @@ -539,6 +545,7 @@ static int udf_table_prealloc_blocks(struct super_block *sb,
> alloc_count = 0;
> }
>
> +err_out:
> brelse(epos.bh);
>
> if (alloc_count)
> @@ -560,6 +567,7 @@ static udf_pblk_t udf_table_new_block(struct super_block *sb,
> struct extent_position epos, goal_epos;
> int8_t etype;
> struct udf_inode_info *iinfo = UDF_I(table);
> + int ret = 0;
>
> *err = -ENOSPC;
>
> @@ -584,7 +592,7 @@ static udf_pblk_t udf_table_new_block(struct super_block *sb,
> epos.bh = goal_epos.bh = NULL;
>
> while (spread &&
> - (etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) {
> + !(ret = udf_next_aext(table, &epos, &eloc, &elen, &etype, 1))) {
> if (goal >= eloc.logicalBlockNum) {
> if (goal < eloc.logicalBlockNum +
> (elen >> sb->s_blocksize_bits))
> @@ -612,7 +620,7 @@ static udf_pblk_t udf_table_new_block(struct super_block *sb,
>
> brelse(epos.bh);
>
> - if (spread == 0xFFFFFFFF) {
> + if (UDF_EXT_ERR(ret) || spread == 0xFFFFFFFF) {
> brelse(goal_epos.bh);
> mutex_unlock(&sbi->s_alloc_mutex);
> return 0;
> diff --git a/fs/udf/directory.c b/fs/udf/directory.c
> index 93153665eb37..82922a4ae425 100644
> --- a/fs/udf/directory.c
> +++ b/fs/udf/directory.c
> @@ -166,13 +166,19 @@ static struct buffer_head *udf_fiiter_bread_blk(struct udf_fileident_iter *iter)
> */
> static int udf_fiiter_advance_blk(struct udf_fileident_iter *iter)
> {
> + int8_t etype = -1;
> + int err = 0;
> +
> iter->loffset++;
> if (iter->loffset < DIV_ROUND_UP(iter->elen, 1<<iter->dir->i_blkbits))
> return 0;
>
> iter->loffset = 0;
> - if (udf_next_aext(iter->dir, &iter->epos, &iter->eloc, &iter->elen, 1)
> - != (EXT_RECORDED_ALLOCATED >> 30)) {
> + err = udf_next_aext(iter->dir, &iter->epos, &iter->eloc, &iter->elen,
> + &etype, 1);
> + if (UDF_EXT_ERR(err))
> + return err;
> + else if (UDF_EXT_EOF(err) || etype != (EXT_RECORDED_ALLOCATED >> 30)) {
> if (iter->pos == iter->dir->i_size) {
> iter->elen = 0;
> return 0;
> diff --git a/fs/udf/inode.c b/fs/udf/inode.c
> index 3be59aa8d4fd..6c4f104e2bf7 100644
> --- a/fs/udf/inode.c
> +++ b/fs/udf/inode.c
> @@ -545,6 +545,7 @@ static int udf_do_extend_file(struct inode *inode,
> } else {
> struct kernel_lb_addr tmploc;
> uint32_t tmplen;
> + int8_t tmptype;
>
> udf_write_aext(inode, last_pos, &last_ext->extLocation,
> last_ext->extLength, 1);
> @@ -554,8 +555,12 @@ static int udf_do_extend_file(struct inode *inode,
> * more extents, we may need to enter possible following
> * empty indirect extent.
> */
> - if (new_block_bytes)
> - udf_next_aext(inode, last_pos, &tmploc, &tmplen, 0);
> + if (new_block_bytes) {
> + err = udf_next_aext(inode, last_pos, &tmploc, &tmplen,
> + &tmptype, 0);
> + if (UDF_EXT_ERR(err))
> + goto out_err;
> + }
> }
> iinfo->i_lenExtents += add;
>
> @@ -674,8 +679,10 @@ static int udf_extend_file(struct inode *inode, loff_t newsize)
> extent.extLength = EXT_NOT_RECORDED_NOT_ALLOCATED;
> } else {
> epos.offset -= adsize;
> - etype = udf_next_aext(inode, &epos, &extent.extLocation,
> - &extent.extLength, 0);
> + err = udf_next_aext(inode, &epos, &extent.extLocation,
> + &extent.extLength, &etype, 0);
> + if (UDF_EXT_ERR(err))
> + goto out;
> extent.extLength |= etype << 30;
> }
>
> @@ -712,11 +719,11 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
> loff_t lbcount = 0, b_off = 0;
> udf_pblk_t newblocknum;
> sector_t offset = 0;
> - int8_t etype;
> + int8_t etype, tmpetype;
> struct udf_inode_info *iinfo = UDF_I(inode);
> udf_pblk_t goal = 0, pgoal = iinfo->i_location.logicalBlockNum;
> int lastblock = 0;
> - bool isBeyondEOF;
> + bool isBeyondEOF = false;
> int ret = 0;
>
> prev_epos.offset = udf_file_entry_alloc_offset(inode);
> @@ -748,9 +755,12 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
> prev_epos.offset = cur_epos.offset;
> cur_epos.offset = next_epos.offset;
>
> - etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 1);
> - if (etype == -1)
> + ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 1);
> + if (UDF_EXT_EOF(ret)) {
> + isBeyondEOF = true;
> break;
> + } else if (ret < 0)
> + goto out_free;
>
> c = !c;
>
> @@ -771,8 +781,12 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
> * Move prev_epos and cur_epos into indirect extent if we are at
> * the pointer to it
> */
> - udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, 0);
> - udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, 0);
> + ret = udf_next_aext(inode, &prev_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
> + if (UDF_EXT_ERR(ret))
> + goto out_free;
> + ret = udf_next_aext(inode, &cur_epos, &tmpeloc, &tmpelen, &tmpetype, 0);
> + if (UDF_EXT_ERR(ret))
> + goto out_free;
>
> /* if the extent is allocated and recorded, return the block
> if the extent is not a multiple of the blocksize, round up */
> @@ -793,10 +807,9 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
> }
>
> /* Are we beyond EOF and preallocated extent? */
> - if (etype == -1) {
> + if (isBeyondEOF) {
> loff_t hole_len;
>
> - isBeyondEOF = true;
> if (count) {
> if (c)
> laarr[0] = laarr[1];
> @@ -832,7 +845,6 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
> endnum = c + 1;
> lastblock = 1;
> } else {
> - isBeyondEOF = false;
> endnum = startnum = ((count > 2) ? 2 : count);
>
> /* if the current extent is in position 0,
> @@ -846,15 +858,17 @@ static int inode_getblk(struct inode *inode, struct udf_map_rq *map)
>
> /* if the current block is located in an extent,
> read the next extent */
> - etype = udf_next_aext(inode, &next_epos, &eloc, &elen, 0);
> - if (etype != -1) {
> + ret = udf_next_aext(inode, &next_epos, &eloc, &elen, &etype, 0);
> + if (!ret) {
> laarr[c + 1].extLength = (etype << 30) | elen;
> laarr[c + 1].extLocation = eloc;
> count++;
> startnum++;
> endnum++;
> - } else
> + } else if (UDF_EXT_EOF(ret))
> lastblock = 1;
> + else
> + goto out_free;
> }
>
> /* if the current extent is not recorded but allocated, get the
> @@ -1172,6 +1186,7 @@ static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
> int start = 0, i;
> struct kernel_lb_addr tmploc;
> uint32_t tmplen;
> + int8_t tmpetype;
> int err;
>
> if (startnum > endnum) {
> @@ -1189,14 +1204,19 @@ static int udf_update_extents(struct inode *inode, struct kernel_long_ad *laarr,
> */
> if (err < 0)
> return err;
> - udf_next_aext(inode, epos, &laarr[i].extLocation,
> - &laarr[i].extLength, 1);
> + err = udf_next_aext(inode, epos, &laarr[i].extLocation,
> + &laarr[i].extLength, &tmpetype, 1);
> + if (UDF_EXT_ERR(err))
> + return err;
> start++;
> }
> }
>
> for (i = start; i < endnum; i++) {
> - udf_next_aext(inode, epos, &tmploc, &tmplen, 0);
> + err = udf_next_aext(inode, epos, &tmploc, &tmplen, &tmpetype, 0);
> + if (UDF_EXT_ERR(err))
> + return err;
> +
> udf_write_aext(inode, epos, &laarr[i].extLocation,
> laarr[i].extLength, 1);
> }
> @@ -2168,15 +2188,15 @@ void udf_write_aext(struct inode *inode, struct extent_position *epos,
> */
> #define UDF_MAX_INDIR_EXTS 16
>
> -int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
> - struct kernel_lb_addr *eloc, uint32_t *elen, int inc)
> +int udf_next_aext(struct inode *inode, struct extent_position *epos,
> + struct kernel_lb_addr *eloc, uint32_t *elen, int8_t *etype,
> + int inc)
> {
> - int8_t etype;
> unsigned int indirections = 0;
> int err = 0;
>
> - while ((err = udf_current_aext(inode, epos, eloc, elen, &etype, inc))) {
> - if (err || etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30))
> + while ((err = udf_current_aext(inode, epos, eloc, elen, etype, inc))) {
> + if (err || *etype != (EXT_NEXT_EXTENT_ALLOCDESCS >> 30))
> break;
>
> udf_pblk_t block;
> @@ -2185,7 +2205,7 @@ int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
> udf_err(inode->i_sb,
> "too many indirect extents in inode %lu\n",
> inode->i_ino);
> - return -1;
> + return -EFSCORRUPTED;
> }
>
> epos->block = *eloc;
> @@ -2195,11 +2215,11 @@ int8_t udf_next_aext(struct inode *inode, struct extent_position *epos,
> epos->bh = sb_bread(inode->i_sb, block);
> if (!epos->bh) {
> udf_debug("reading block %u failed!\n", block);
> - return -1;
> + return -EIO;
> }
> }
>
> - return !err ? etype : -1;
> + return err;
> }
>
> int udf_current_aext(struct inode *inode, struct extent_position *epos,
> @@ -2267,12 +2287,14 @@ static int udf_insert_aext(struct inode *inode, struct extent_position epos,
> if (epos.bh)
> get_bh(epos.bh);
>
> - while ((etype = udf_next_aext(inode, &epos, &oeloc, &oelen, 0)) != -1) {
> + while (!(err = udf_next_aext(inode, &epos, &oeloc,
> + &oelen, &etype, 0))) {
> udf_write_aext(inode, &epos, &neloc, nelen, 1);
> neloc = oeloc;
> nelen = (etype << 30) | oelen;
> }
> - err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
> + if (UDF_EXT_EOF(err))
> + err = udf_add_aext(inode, &epos, &neloc, nelen, 1);
> brelse(epos.bh);
>
> return err;
> @@ -2287,6 +2309,7 @@ int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
> struct udf_inode_info *iinfo;
> struct kernel_lb_addr eloc;
> uint32_t elen;
> + int err = 0;
>
> if (epos.bh) {
> get_bh(epos.bh);
> @@ -2302,10 +2325,11 @@ int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
> adsize = 0;
>
> oepos = epos;
> - if (udf_next_aext(inode, &epos, &eloc, &elen, 1) == -1)
> + err = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1);
> + if (UDF_EXT_ERR(err))
> return -1;
>
> - while ((etype = udf_next_aext(inode, &epos, &eloc, &elen, 1)) != -1) {
> + while (!(err = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1))) {
> udf_write_aext(inode, &oepos, &eloc, (etype << 30) | elen, 1);
> if (oepos.bh != epos.bh) {
> oepos.block = epos.block;
> @@ -2315,6 +2339,11 @@ int8_t udf_delete_aext(struct inode *inode, struct extent_position epos)
> oepos.offset = epos.offset - adsize;
> }
> }
> + if (UDF_EXT_ERR(err)) {
> + brelse(epos.bh);
> + brelse(oepos.bh);
> + return -1;
> + }
> memset(&eloc, 0x00, sizeof(struct kernel_lb_addr));
> elen = 0;
>
> @@ -2370,6 +2399,7 @@ 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)) {
> @@ -2379,12 +2409,13 @@ 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 (UDF_EXT_EOF(err)) {
> *offset = (bcount - lbcount) >> blocksize_bits;
> iinfo->i_lenExtents = lbcount;
> - return -1;
> }
> + if (err < 0)
> + return -1;
> lbcount += *elen;
> } while (lbcount <= bcount);
> /* update extent cache */
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index 3460ecc826d1..8c34224e1aee 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -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))
> accum += (elen >> table->i_sb->s_blocksize_bits);
>
> brelse(epos.bh);
> diff --git a/fs/udf/truncate.c b/fs/udf/truncate.c
> index 16db2613401d..af06f7101859 100644
> --- a/fs/udf/truncate.c
> +++ b/fs/udf/truncate.c
> @@ -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 err = 0;
>
> if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
> inode->i_size == iinfo->i_lenExtents)
> @@ -85,7 +86,7 @@ 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 (!(err = udf_next_aext(inode, &epos, &eloc, &elen, &netype, 1))) {
> etype = netype;
> lbcount += elen;
> if (lbcount > inode->i_size) {
> @@ -101,7 +102,7 @@ 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))
> udf_err(inode->i_sb,
> "Extent after EOF in inode %u\n",
> (unsigned)inode->i_ino);
> @@ -110,7 +111,8 @@ 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 */
> - iinfo->i_lenExtents = inode->i_size;
> + if (UDF_EXT_EOF(err))
> + iinfo->i_lenExtents = inode->i_size;
> brelse(epos.bh);
> }
>
> @@ -124,6 +126,8 @@ 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 err = 0;
>
> if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
> ALIGN(inode->i_size, bsize) == ALIGN(iinfo->i_lenExtents, bsize))
> @@ -132,16 +136,22 @@ 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 (!(err = udf_next_aext(inode, &epos, &eloc, &elen, &tmpetype,
> + 0))) {
> 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);
> + err = udf_next_aext(inode, &epos, &eloc, &elen, &etype, 1);
> + if (err < 0)
> + break;
> lbcount += elen;
> }
> - if (etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
> + if (UDF_EXT_ERR(err))
> + goto out;
> +
> + if (!err && etype == (EXT_NOT_RECORDED_ALLOCATED >> 30)) {
> lbcount -= elen;
> udf_delete_aext(inode, prev_epos);
> udf_free_blocks(inode->i_sb, inode, &eloc, 0,
> @@ -150,6 +160,7 @@ 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);
> }
> diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
> index a902652450dd..206077da9968 100644
> --- a/fs/udf/udfdecl.h
> +++ b/fs/udf/udfdecl.h
> @@ -172,8 +172,9 @@ 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);
> --
> 2.43.0
>
--
Jan Kara <jack@...e.com>
SUSE Labs, CR
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