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HPFS: Introduce a global mutex and lock it on every callback from VFS.

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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>
This commit is contained in:
Mikulas Patocka 2011-05-08 20:42:54 +02:00 • committed by Linus Torvalds
parent 637b424bf8
commit 7dd29d8d86
4 changed files with 51 additions and 18 deletions
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8
fs/hpfs/buffer.c
View file

@ -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;