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authorMikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>2011-05-08 20:42:54 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2011-05-09 09:04:23 -0700
commit7dd29d8d865efdb00c0542a5d2c87af8c52ea6c7 (patch)
tree71f404ed317e2d1b689af088ece1c32c3b1535c8 /fs/hpfs/buffer.c
parent637b424bf8747e50bab6648ab919632d6efd6c28 (diff)
downloadtalos-op-linux-7dd29d8d865efdb00c0542a5d2c87af8c52ea6c7.tar.gz
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HPFS: Introduce a global mutex and lock it on every callback from VFS.
Introduce a global mutex and lock it on every callback from VFS. Performance doesn't matter, reviewing the whole code for locking correctness would be too complicated, so simply lock it all. Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/hpfs/buffer.c')
-rw-r--r--fs/hpfs/buffer.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/hpfs/buffer.c b/fs/hpfs/buffer.c
index 793cb9d943d2..7cef5d5c3608 100644
--- a/fs/hpfs/buffer.c
+++ b/fs/hpfs/buffer.c
@@ -32,6 +32,8 @@ void *hpfs_map_sector(struct super_block *s, unsigned secno, struct buffer_head
{
struct buffer_head *bh;
+ hpfs_lock_assert(s);
+
cond_resched();
*bhp = bh = sb_bread(s, secno);
@@ -50,6 +52,8 @@ void *hpfs_get_sector(struct super_block *s, unsigned secno, struct buffer_head
struct buffer_head *bh;
/*return hpfs_map_sector(s, secno, bhp, 0);*/
+ hpfs_lock_assert(s);
+
cond_resched();
if ((*bhp = bh = sb_getblk(s, secno)) != NULL) {
@@ -70,6 +74,8 @@ void *hpfs_map_4sectors(struct super_block *s, unsigned secno, struct quad_buffe
struct buffer_head *bh;
char *data;
+ hpfs_lock_assert(s);
+
cond_resched();
if (secno & 3) {
@@ -125,6 +131,8 @@ void *hpfs_get_4sectors(struct super_block *s, unsigned secno,
{
cond_resched();
+ hpfs_lock_assert(s);
+
if (secno & 3) {
printk("HPFS: hpfs_get_4sectors: unaligned read\n");
return NULL;
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