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| author | Alessio Igor Bogani <abogani@texware.it> | 2010-11-16 18:40:48 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2011-01-06 17:03:56 +0100 |
| commit | 7db09be629033b79792a1bf18f505f5f15914395 (patch) | |
| tree | 0302e8f2ae6090d5a47a66f0312413465d383321 | |
| parent | 4d0fb621d35007c19a396f2bb629e5aeaacef2d0 (diff) | |
| download | linux-stable-7db09be629033b79792a1bf18f505f5f15914395.tar.gz linux-stable-7db09be629033b79792a1bf18f505f5f15914395.tar.bz2 linux-stable-7db09be629033b79792a1bf18f505f5f15914395.zip | |
udf: Use of s_alloc_mutex to serialize udf_relocate_blocks() execution
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>
| -rw-r--r-- | 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 745eb209be0c..a71090ea0e07 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, |