mirror of https://gitee.com/openkylin/linux.git
udf: Cleanup volume descriptor sequence processing
Cleanup processing of volume descriptor sequence so that it is more readable, make code handle errors (e.g. media problems) better. Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Jan Kara
parent
d0db181c07
commit
c0eb31ed13
135
fs/udf/super.c
135
fs/udf/super.c
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@ -85,16 +85,12 @@ static int udf_remount_fs(struct super_block *, int *, char *);
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static int udf_check_valid(struct super_block *, int, int);
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static int udf_vrs(struct super_block *sb, int silent);
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static int udf_load_partition(struct super_block *, kernel_lb_addr *);
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static int udf_load_logicalvol(struct super_block *, struct buffer_head *,
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kernel_lb_addr *);
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static void udf_load_logicalvolint(struct super_block *, kernel_extent_ad);
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static void udf_find_anchor(struct super_block *);
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static int udf_find_fileset(struct super_block *, kernel_lb_addr *,
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kernel_lb_addr *);
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static void udf_load_pvoldesc(struct super_block *, struct buffer_head *);
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static void udf_load_fileset(struct super_block *, struct buffer_head *,
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kernel_lb_addr *);
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static int udf_load_partdesc(struct super_block *, struct buffer_head *);
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static void udf_open_lvid(struct super_block *);
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static void udf_close_lvid(struct super_block *);
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static unsigned int udf_count_free(struct super_block *);
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@ -935,11 +931,18 @@ static int udf_find_fileset(struct super_block *sb,
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return 1;
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}
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static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
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static int udf_load_pvoldesc(struct super_block *sb, sector_t block)
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{
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struct primaryVolDesc *pvoldesc;
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struct ustr instr;
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struct ustr outstr;
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struct buffer_head *bh;
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uint16_t ident;
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bh = udf_read_tagged(sb, block, block, &ident);
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if (!bh)
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return 1;
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BUG_ON(ident != TAG_IDENT_PVD);
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pvoldesc = (struct primaryVolDesc *)bh->b_data;
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@ -965,6 +968,9 @@ static void udf_load_pvoldesc(struct super_block *sb, struct buffer_head *bh)
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if (!udf_build_ustr(&instr, pvoldesc->volSetIdent, 128))
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if (udf_CS0toUTF8(&outstr, &instr))
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udf_debug("volSetIdent[] = '%s'\n", outstr.u_name);
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brelse(bh);
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return 0;
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}
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static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh,
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@ -1018,16 +1024,27 @@ static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index)
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return bitmap;
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}
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static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
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static int udf_load_partdesc(struct super_block *sb, sector_t block)
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{
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struct buffer_head *bh;
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struct partitionHeaderDesc *phd;
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struct partitionDesc *p = (struct partitionDesc *)bh->b_data;
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struct partitionDesc *p;
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struct udf_part_map *map;
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struct udf_sb_info *sbi = UDF_SB(sb);
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bool found = false;
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int i;
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u16 partitionNumber = le16_to_cpu(p->partitionNumber);
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uint16_t partitionNumber;
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uint16_t ident;
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int ret = 0;
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bh = udf_read_tagged(sb, block, block, &ident);
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if (!bh)
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return 1;
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if (ident != TAG_IDENT_PD)
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goto out_bh;
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p = (struct partitionDesc *)bh->b_data;
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partitionNumber = le16_to_cpu(p->partitionNumber);
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for (i = 0; i < sbi->s_partitions; i++) {
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map = &sbi->s_partmaps[i];
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udf_debug("Searching map: (%d == %d)\n",
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@ -1040,7 +1057,7 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
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if (!found) {
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udf_debug("Partition (%d) not found in partition map\n",
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partitionNumber);
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return 0;
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goto out_bh;
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}
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map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */
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@ -1062,7 +1079,7 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
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if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) &&
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strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03))
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return 0;
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goto out_bh;
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phd = (struct partitionHeaderDesc *)p->partitionContentsUse;
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if (phd->unallocSpaceTable.extLength) {
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@ -1076,7 +1093,8 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
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if (!map->s_uspace.s_table) {
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udf_debug("cannot load unallocSpaceTable (part %d)\n",
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i);
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return 1;
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ret = 1;
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goto out_bh;
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}
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map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE;
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udf_debug("unallocSpaceTable (part %d) @ %ld\n",
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@ -1110,7 +1128,8 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
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map->s_fspace.s_table = udf_iget(sb, loc);
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if (!map->s_fspace.s_table) {
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udf_debug("cannot load freedSpaceTable (part %d)\n", i);
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return 1;
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ret = 1;
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goto out_bh;
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}
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map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE;
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@ -1132,10 +1151,12 @@ static int udf_load_partdesc(struct super_block *sb, struct buffer_head *bh)
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}
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}
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return 0;
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out_bh:
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brelse(bh);
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return ret;
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}
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static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
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static int udf_load_logicalvol(struct super_block *sb, sector_t block,
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kernel_lb_addr *fileset)
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{
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struct logicalVolDesc *lvd;
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@ -1143,12 +1164,21 @@ static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
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uint8_t type;
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct genericPartitionMap *gpm;
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uint16_t ident;
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struct buffer_head *bh;
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int ret = 0;
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bh = udf_read_tagged(sb, block, block, &ident);
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if (!bh)
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return 1;
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BUG_ON(ident != TAG_IDENT_LVD);
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lvd = (struct logicalVolDesc *)bh->b_data;
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i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps));
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if (i != 0)
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return i;
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if (i != 0) {
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ret = i;
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goto out_bh;
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}
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for (i = 0, offset = 0;
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i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength);
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@ -1187,7 +1217,6 @@ static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
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UDF_ID_SPARABLE,
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strlen(UDF_ID_SPARABLE))) {
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uint32_t loc;
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uint16_t ident;
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struct sparingTable *st;
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struct sparablePartitionMap *spm =
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(struct sparablePartitionMap *)gpm;
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@ -1243,7 +1272,9 @@ static int udf_load_logicalvol(struct super_block *sb, struct buffer_head *bh,
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if (lvd->integritySeqExt.extLength)
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udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt));
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return 0;
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out_bh:
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brelse(bh);
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return ret;
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}
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/*
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@ -1301,19 +1332,25 @@ static noinline int udf_process_sequence(struct super_block *sb, long block,
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struct generic_desc *gd;
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struct volDescPtr *vdp;
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int done = 0;
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int i, j;
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uint32_t vdsn;
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uint16_t ident;
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long next_s = 0, next_e = 0;
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memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH);
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/* Read the main descriptor sequence */
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/*
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* Read the main descriptor sequence and find which descriptors
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* are in it.
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*/
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for (; (!done && block <= lastblock); block++) {
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bh = udf_read_tagged(sb, block, block, &ident);
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if (!bh)
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break;
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if (!bh) {
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printk(KERN_ERR "udf: Block %Lu of volume descriptor "
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"sequence is corrupted or we could not read "
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"it.\n", (unsigned long long)block);
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return 1;
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}
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/* Process each descriptor (ISO 13346 3/8.3-8.4) */
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gd = (struct generic_desc *)bh->b_data;
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@ -1379,41 +1416,31 @@ static noinline int udf_process_sequence(struct super_block *sb, long block,
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}
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brelse(bh);
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}
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for (i = 0; i < VDS_POS_LENGTH; i++) {
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if (!vds[i].block)
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continue;
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/*
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* Now read interesting descriptors again and process them
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* in a suitable order
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*/
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if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) {
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printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n");
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return 1;
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}
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if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block))
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return 1;
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bh = udf_read_tagged(sb, vds[i].block, vds[i].block,
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&ident);
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if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb,
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vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset))
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return 1;
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if (i == VDS_POS_PRIMARY_VOL_DESC)
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udf_load_pvoldesc(sb, bh);
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else if (i == VDS_POS_LOGICAL_VOL_DESC) {
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if (udf_load_logicalvol(sb, bh, fileset)) {
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brelse(bh);
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if (vds[VDS_POS_PARTITION_DESC].block) {
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/*
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* We rescan the whole descriptor sequence to find
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* partition descriptor blocks and process them.
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*/
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for (block = vds[VDS_POS_PARTITION_DESC].block;
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block < vds[VDS_POS_TERMINATING_DESC].block;
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block++)
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if (udf_load_partdesc(sb, block))
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return 1;
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}
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} else if (i == VDS_POS_PARTITION_DESC) {
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struct buffer_head *bh2 = NULL;
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if (udf_load_partdesc(sb, bh)) {
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brelse(bh);
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return 1;
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}
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for (j = vds[i].block + 1;
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j < vds[VDS_POS_TERMINATING_DESC].block;
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j++) {
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bh2 = udf_read_tagged(sb, j, j, &ident);
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gd = (struct generic_desc *)bh2->b_data;
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if (ident == TAG_IDENT_PD)
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if (udf_load_partdesc(sb, bh2)) {
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brelse(bh);
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brelse(bh2);
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return 1;
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}
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brelse(bh2);
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}
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}
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brelse(bh);
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}
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return 0;
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