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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. * allocation; this avoids failures at block-decompression time.
*/ */
static void *zisofs_zlib_workspace; 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 * 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. /* First block is special since it may be fractional.
We also wait for it before grabbing the zlib 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 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)) ) { if ( !bh || (wait_on_buffer(bh), !buffer_uptodate(bh)) ) {
printk(KERN_DEBUG "zisofs: Hit null buffer, fpage = %d, xpage = %d, csize = %ld\n", 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; csize -= stream.avail_in;
stream.workspace = zisofs_zlib_workspace; stream.workspace = zisofs_zlib_workspace;
down(&zisofs_zlib_semaphore); mutex_lock(&zisofs_zlib_lock);
zerr = zlib_inflateInit(&stream); zerr = zlib_inflateInit(&stream);
if ( zerr != Z_OK ) { if ( zerr != Z_OK ) {
@ -281,7 +281,7 @@ static int zisofs_readpage(struct file *file, struct page *page)
zlib_inflateEnd(&stream); zlib_inflateEnd(&stream);
z_eio: z_eio:
up(&zisofs_zlib_semaphore); mutex_unlock(&zisofs_zlib_lock);
b_eio: b_eio:
for ( i = 0 ; i < haveblocks ; i++ ) { for ( i = 0 ; i < haveblocks ; i++ ) {
@ -317,31 +317,16 @@ const struct address_space_operations zisofs_aops = {
/* No bmap operation supported */ /* No bmap operation supported */
}; };
static int initialized;
int __init zisofs_init(void) int __init zisofs_init(void)
{ {
if ( initialized ) {
printk("zisofs_init: called more than once\n");
return 0;
}
zisofs_zlib_workspace = vmalloc(zlib_inflate_workspacesize()); zisofs_zlib_workspace = vmalloc(zlib_inflate_workspacesize());
if ( !zisofs_zlib_workspace ) if ( !zisofs_zlib_workspace )
return -ENOMEM; return -ENOMEM;
init_MUTEX(&zisofs_zlib_semaphore);
initialized = 1;
return 0; return 0;
} }
void zisofs_cleanup(void) void zisofs_cleanup(void)
{ {
if ( !initialized ) {
printk("zisofs_cleanup: called without initialization\n");
return;
}
vfree(zisofs_zlib_workspace); vfree(zisofs_zlib_workspace);
initialized = 0;
} }