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Subject[PATCH 2/3] udf: Use of s_alloc_mutex to serialize udf_relocate_blocks() execution
Date
This work was supported by a hardware donation from the CE Linux Forum.

Signed-off-by: Alessio Igor Bogani <abogani@texware.it>
---
fs/udf/partition.c | 27 +++++++++++++++++++--------
1 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/fs/udf/partition.c b/fs/udf/partition.c
index 745eb20..a71090e 100644
--- a/fs/udf/partition.c
+++ b/fs/udf/partition.c
@@ -25,6 +25,7 @@
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/buffer_head.h>
+#include <linux/mutex.h>

uint32_t udf_get_pblock(struct super_block *sb, uint32_t block,
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);
u16 reallocationTableLen;
struct buffer_head *bh;
+ int ret = 0;

+ mutex_lock(&sbi->s_alloc_mutex);
for (i = 0; i < sbi->s_partitions; i++) {
struct udf_part_map *map = &sbi->s_partmaps[i];
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;
}

- if (!st)
- return 1;
+ if (!st) {
+ ret = 1;
+ goto out;
+ }

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 -
map->s_partition_root) &
(sdata->s_packet_len - 1));
- return 0;
+ ret = 0;
+ goto out;
} else if (origLoc == packet) {
*new_block = le32_to_cpu(
entry->mappedLocation) +
((old_block -
map->s_partition_root) &
(sdata->s_packet_len - 1));
- return 0;
+ ret = 0;
+ goto out;
} else if (origLoc > packet)
break;
}
@@ -251,20 +258,24 @@ int udf_relocate_blocks(struct super_block *sb, long old_block, long *new_block)
st->mapEntry[k].mappedLocation) +
((old_block - map->s_partition_root) &
(sdata->s_packet_len - 1));
- return 0;
+ ret = 0;
+ goto out;
}

- return 1;
+ ret = 1;
+ goto out;
} /* if old_block */
}

if (i == sbi->s_partitions) {
/* outside of partitions */
/* 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,
--
1.7.0.4


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