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udf: Use of s_alloc_mutex to serialize udf_relocate_blocks() execution

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This work was supported by a hardware donation from the CE Linux Forum.

Signed-off-by: Alessio Igor Bogani <abogani@texware.it>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Alessio Igor Bogani 2010-11-16 18:40:48 +01:00 committed by Jan Kara
parent 4d0fb621d3
commit 7db09be629
1 changed files with 19 additions and 8 deletions
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27
fs/udf/partition.c
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@ -25,6 +25,7 @@
#include <linux/fs.h> #include <linux/fs.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/buffer_head.h> #include <linux/buffer_head.h>
#include <linux/mutex.h>
uint32_t udf_get_pblock(struct super_block *sb, uint32_t block, uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
uint16_t partition, uint32_t offset) uint16_t partition, uint32_t offset)
@ -159,7 +160,9 @@ int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
struct udf_sb_info *sbi = UDF_SB(sb); struct udf_sb_info *sbi = UDF_SB(sb);
u16 reallocationTableLen; u16 reallocationTableLen;
struct buffer_head *bh; struct buffer_head *bh;
int ret = 0;
mutex_lock(&sbi->s_alloc_mutex);
for (i = 0; i < sbi->s_partitions; i++) { for (i = 0; i < sbi->s_partitions; i++) {
struct udf_part_map *map = &sbi->s_partmaps[i]; struct udf_part_map *map = &sbi->s_partmaps[i];
if (old_block > map->s_partition_root && if (old_block > map->s_partition_root &&
@ -175,8 +178,10 @@ int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
break; break;
} }
if (!st) if (!st) {
return 1; ret = 1;
goto out;
}
reallocationTableLen = reallocationTableLen =
le16_to_cpu(st->reallocationTableLen); le16_to_cpu(st->reallocationTableLen);
@ -207,14 +212,16 @@ int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
((old_block - ((old_block -
map->s_partition_root) & map->s_partition_root) &
(sdata->s_packet_len - 1)); (sdata->s_packet_len - 1));
return 0; ret = 0;
goto out;
} else if (origLoc == packet) { } else if (origLoc == packet) {
*new_block = le32_to_cpu( *new_block = le32_to_cpu(
entry->mappedLocation) + entry->mappedLocation) +
((old_block - ((old_block -
map->s_partition_root) & map->s_partition_root) &
(sdata->s_packet_len - 1)); (sdata->s_packet_len - 1));
return 0; ret = 0;
goto out;
} else if (origLoc > packet) } else if (origLoc > packet)
break; break;
} }
@ -251,20 +258,24 @@ int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
st->mapEntry[k].mappedLocation) + st->mapEntry[k].mappedLocation) +
((old_block - map->s_partition_root) & ((old_block - map->s_partition_root) &
(sdata->s_packet_len - 1)); (sdata->s_packet_len - 1));
return 0; ret = 0;
goto out;
} }
return 1; ret = 1;
goto out;
} /* if old_block */ } /* if old_block */
} }
if (i == sbi->s_partitions) { if (i == sbi->s_partitions) {
/* outside of partitions */ /* outside of partitions */
/* for now, fail =) */ /* for now, fail =) */
return 1; ret = 1;
} }
return 0; out:
mutex_unlock(&sbi->s_alloc_mutex);
return ret;
} }
static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block, static uint32_t udf_try_read_meta(struct inode *inode, uint32_t block,