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zisofs use mutex instead of semaphore

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Use mutex instead of semaphore in fs/isofs/compress.c, and remove an
unnecessary variable.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Young 2007-10-16 23:26:10 -07:00 committed by Linus Torvalds
parent 040b5c6f95
commit a36a151e79
1 changed files with 5 additions and 20 deletions
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25
fs/isofs/compress.c
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@ -33,7 +33,7 @@ static char zisofs_sink_page[PAGE_CACHE_SIZE];
* allocation; this avoids failures at block-decompression time.
*/
static void *zisofs_zlib_workspace;
static struct semaphore zisofs_zlib_semaphore;
static DEFINE_MUTEX(zisofs_zlib_lock);
/*
* When decompressing, we typically obtain more than one page
@ -180,9 +180,9 @@ static int zisofs_readpage(struct file *file, struct page *page)
/* First block is special since it may be fractional.
We also wait for it before grabbing the zlib
semaphore; odds are that the subsequent blocks are
mutex; odds are that the subsequent blocks are
going to come in in short order so we don't hold
the zlib semaphore longer than necessary. */
the zlib mutex longer than necessary. */
if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
printk(KERN_DEBUG "zisofs: Hit null buffer, fpage = %d, xpage = %d, csize = %ld\n",
@ -194,7 +194,7 @@ static int zisofs_readpage(struct file *file, struct page *page)
csize -= stream.avail_in;
stream.workspace = zisofs_zlib_workspace;
down(&zisofs_zlib_semaphore);
mutex_lock(&zisofs_zlib_lock);
zerr = zlib_inflateInit(&stream);
if ( zerr != Z_OK ) {
@ -281,7 +281,7 @@ static int zisofs_readpage(struct file *file, struct page *page)
zlib_inflateEnd(&stream);
z_eio:
up(&zisofs_zlib_semaphore);
mutex_unlock(&zisofs_zlib_lock);
b_eio:
for ( i = 0 ; i < haveblocks ; i++ ) {
@ -317,31 +317,16 @@ const struct address_space_operations zisofs_aops = {
/* No bmap operation supported */
};
static int initialized;
int __init zisofs_init(void)
{
if ( initialized ) {
printk("zisofs_init: called more than once\n");
return 0;
}
zisofs_zlib_workspace = vmalloc(zlib_inflate_workspacesize());
if ( !zisofs_zlib_workspace )
return -ENOMEM;
init_MUTEX(&zisofs_zlib_semaphore);
initialized = 1;
return 0;
}
void zisofs_cleanup(void)
{
if ( !initialized ) {
printk("zisofs_cleanup: called without initialization\n");
return;
}
vfree(zisofs_zlib_workspace);
initialized = 0;
}