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authorBorislav Petkov <petkovbb@googlemail.com>2008-04-27 15:38:33 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-04-27 15:38:33 +0200
commitd01dbc3b85d57f3ab89be4291d4739152bb1713a (patch)
treec08ebdac853f2abbf3bf41f4c056953d643dbdad /drivers
parenta997a4356ba33dcb9c061677d5943794a29489e8 (diff)
downloadop-kernel-dev-d01dbc3b85d57f3ab89be4291d4739152bb1713a.zip
op-kernel-dev-d01dbc3b85d57f3ab89be4291d4739152bb1713a.tar.gz
ide-tape: improve buffer pages freeing strategy
Instead of freeing pages one by one, free them 2^order-wise. Also, mv __idetape_kfree_stage() to ide_tape_kfree_buffer(). [bart: add updating bh->b_data] Signed-off-by: Borislav Petkov <petkovbb@gmail.com> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ide/ide-tape.c38
1 files changed, 20 insertions, 18 deletions
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index ea46ed8..4e93a82 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -583,20 +583,22 @@ static void idetape_analyze_error(ide_drive_t *drive, u8 *sense)
}
}
-/* Free a stage along with its related buffers completely. */
-static void __idetape_kfree_stage(idetape_stage_t *stage)
+/* Free data buffers completely. */
+static void ide_tape_kfree_buffer(idetape_stage_t *stage)
{
struct idetape_bh *prev_bh, *bh = stage->bh;
- int size;
-
- while (bh != NULL) {
- if (bh->b_data != NULL) {
- size = (int) bh->b_size;
- while (size > 0) {
- free_page((unsigned long) bh->b_data);
- size -= PAGE_SIZE;
- bh->b_data += PAGE_SIZE;
- }
+
+ while (bh) {
+ u32 size = bh->b_size;
+
+ while (size) {
+ unsigned int order = fls(size >> PAGE_SHIFT)-1;
+
+ if (bh->b_data)
+ free_pages((unsigned long)bh->b_data, order);
+
+ size &= (order-1);
+ bh->b_data += (1 << order) * PAGE_SIZE;
}
prev_bh = bh;
bh = bh->b_reqnext;
@@ -1373,7 +1375,7 @@ static idetape_stage_t *ide_tape_kmalloc_buffer(idetape_tape_t *tape, int full,
atomic_sub(tape->excess_bh_size, &bh->b_count);
return stage;
abort:
- __idetape_kfree_stage(stage);
+ ide_tape_kfree_buffer(stage);
return NULL;
}
@@ -1649,7 +1651,7 @@ static int __idetape_discard_read_pipeline(ide_drive_t *drive)
clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
tape->merge_stage_size = 0;
if (tape->merge_stage != NULL) {
- __idetape_kfree_stage(tape->merge_stage);
+ ide_tape_kfree_buffer(tape->merge_stage);
tape->merge_stage = NULL;
}
@@ -1828,7 +1830,7 @@ static void idetape_empty_write_pipeline(ide_drive_t *drive)
tape->merge_stage_size = 0;
}
if (tape->merge_stage != NULL) {
- __idetape_kfree_stage(tape->merge_stage);
+ ide_tape_kfree_buffer(tape->merge_stage);
tape->merge_stage = NULL;
}
tape->chrdev_dir = IDETAPE_DIR_NONE;
@@ -1866,7 +1868,7 @@ static int idetape_init_read(ide_drive_t *drive)
REQ_IDETAPE_READ, 0,
tape->merge_stage->bh);
if (bytes_read < 0) {
- __idetape_kfree_stage(tape->merge_stage);
+ ide_tape_kfree_buffer(tape->merge_stage);
tape->merge_stage = NULL;
tape->chrdev_dir = IDETAPE_DIR_NONE;
return bytes_read;
@@ -2145,7 +2147,7 @@ static ssize_t idetape_chrdev_write(struct file *file, const char __user *buf,
REQ_IDETAPE_WRITE, 0,
tape->merge_stage->bh);
if (retval < 0) {
- __idetape_kfree_stage(tape->merge_stage);
+ ide_tape_kfree_buffer(tape->merge_stage);
tape->merge_stage = NULL;
tape->chrdev_dir = IDETAPE_DIR_NONE;
return retval;
@@ -2512,7 +2514,7 @@ static void idetape_write_release(ide_drive_t *drive, unsigned int minor)
if (tape->merge_stage != NULL) {
idetape_pad_zeros(drive, tape->blk_size *
(tape->user_bs_factor - 1));
- __idetape_kfree_stage(tape->merge_stage);
+ ide_tape_kfree_buffer(tape->merge_stage);
tape->merge_stage = NULL;
}
idetape_write_filemark(drive);
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