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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 18:30:06 +00:00
![Mel Gorman](/assets/img/avatar_default.png)
__GFP_WAIT was used to signal that the caller was in atomic context and could not sleep. Now it is possible to distinguish between true atomic context and callers that are not willing to sleep. The latter should clear __GFP_DIRECT_RECLAIM so kswapd will still wake. As clearing __GFP_WAIT behaves differently, there is a risk that people will clear the wrong flags. This patch renames __GFP_WAIT to __GFP_RECLAIM to clearly indicate what it does -- setting it allows all reclaim activity, clearing them prevents it. [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
289 lines
6.7 KiB
C
289 lines
6.7 KiB
C
/*
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* IDE ioctls handling.
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*/
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#include <linux/export.h>
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#include <linux/hdreg.h>
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#include <linux/ide.h>
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#include <linux/slab.h>
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static const struct ide_ioctl_devset ide_ioctl_settings[] = {
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{ HDIO_GET_32BIT, HDIO_SET_32BIT, &ide_devset_io_32bit },
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{ HDIO_GET_KEEPSETTINGS, HDIO_SET_KEEPSETTINGS, &ide_devset_keepsettings },
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{ HDIO_GET_UNMASKINTR, HDIO_SET_UNMASKINTR, &ide_devset_unmaskirq },
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{ HDIO_GET_DMA, HDIO_SET_DMA, &ide_devset_using_dma },
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{ -1, HDIO_SET_PIO_MODE, &ide_devset_pio_mode },
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{ 0 }
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};
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int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
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unsigned int cmd, unsigned long arg,
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const struct ide_ioctl_devset *s)
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{
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const struct ide_devset *ds;
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int err = -EOPNOTSUPP;
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for (; (ds = s->setting); s++) {
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if (ds->get && s->get_ioctl == cmd)
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goto read_val;
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else if (ds->set && s->set_ioctl == cmd)
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goto set_val;
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}
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return err;
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read_val:
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mutex_lock(&ide_setting_mtx);
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err = ds->get(drive);
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mutex_unlock(&ide_setting_mtx);
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return err >= 0 ? put_user(err, (long __user *)arg) : err;
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set_val:
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if (bdev != bdev->bd_contains)
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err = -EINVAL;
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else {
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if (!capable(CAP_SYS_ADMIN))
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err = -EACCES;
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else {
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mutex_lock(&ide_setting_mtx);
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err = ide_devset_execute(drive, ds, arg);
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mutex_unlock(&ide_setting_mtx);
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}
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}
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return err;
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}
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EXPORT_SYMBOL_GPL(ide_setting_ioctl);
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static int ide_get_identity_ioctl(ide_drive_t *drive, unsigned int cmd,
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unsigned long arg)
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{
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u16 *id = NULL;
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int size = (cmd == HDIO_GET_IDENTITY) ? (ATA_ID_WORDS * 2) : 142;
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int rc = 0;
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if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
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rc = -ENOMSG;
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goto out;
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}
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/* ata_id_to_hd_driveid() relies on 'id' to be fully allocated. */
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id = kmalloc(ATA_ID_WORDS * 2, GFP_KERNEL);
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if (id == NULL) {
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rc = -ENOMEM;
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goto out;
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}
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memcpy(id, drive->id, size);
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ata_id_to_hd_driveid(id);
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if (copy_to_user((void __user *)arg, id, size))
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rc = -EFAULT;
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kfree(id);
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out:
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return rc;
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}
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static int ide_get_nice_ioctl(ide_drive_t *drive, unsigned long arg)
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{
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return put_user((!!(drive->dev_flags & IDE_DFLAG_DSC_OVERLAP)
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<< IDE_NICE_DSC_OVERLAP) |
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(!!(drive->dev_flags & IDE_DFLAG_NICE1)
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<< IDE_NICE_1), (long __user *)arg);
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}
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static int ide_set_nice_ioctl(ide_drive_t *drive, unsigned long arg)
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{
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if (arg != (arg & ((1 << IDE_NICE_DSC_OVERLAP) | (1 << IDE_NICE_1))))
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return -EPERM;
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if (((arg >> IDE_NICE_DSC_OVERLAP) & 1) &&
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(drive->media != ide_tape))
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return -EPERM;
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if ((arg >> IDE_NICE_DSC_OVERLAP) & 1)
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drive->dev_flags |= IDE_DFLAG_DSC_OVERLAP;
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else
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drive->dev_flags &= ~IDE_DFLAG_DSC_OVERLAP;
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if ((arg >> IDE_NICE_1) & 1)
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drive->dev_flags |= IDE_DFLAG_NICE1;
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else
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drive->dev_flags &= ~IDE_DFLAG_NICE1;
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return 0;
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}
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static int ide_cmd_ioctl(ide_drive_t *drive, unsigned long arg)
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{
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u8 *buf = NULL;
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int bufsize = 0, err = 0;
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u8 args[4], xfer_rate = 0;
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struct ide_cmd cmd;
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struct ide_taskfile *tf = &cmd.tf;
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if (NULL == (void *) arg) {
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struct request *rq;
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rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
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rq->cmd_type = REQ_TYPE_ATA_TASKFILE;
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err = blk_execute_rq(drive->queue, NULL, rq, 0);
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blk_put_request(rq);
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return err;
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}
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if (copy_from_user(args, (void __user *)arg, 4))
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return -EFAULT;
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memset(&cmd, 0, sizeof(cmd));
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tf->feature = args[2];
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if (args[0] == ATA_CMD_SMART) {
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tf->nsect = args[3];
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tf->lbal = args[1];
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tf->lbam = ATA_SMART_LBAM_PASS;
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tf->lbah = ATA_SMART_LBAH_PASS;
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cmd.valid.out.tf = IDE_VALID_OUT_TF;
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cmd.valid.in.tf = IDE_VALID_NSECT;
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} else {
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tf->nsect = args[1];
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cmd.valid.out.tf = IDE_VALID_FEATURE | IDE_VALID_NSECT;
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cmd.valid.in.tf = IDE_VALID_NSECT;
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}
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tf->command = args[0];
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cmd.protocol = args[3] ? ATA_PROT_PIO : ATA_PROT_NODATA;
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if (args[3]) {
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cmd.tf_flags |= IDE_TFLAG_IO_16BIT;
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bufsize = SECTOR_SIZE * args[3];
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buf = kzalloc(bufsize, GFP_KERNEL);
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if (buf == NULL)
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return -ENOMEM;
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}
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if (tf->command == ATA_CMD_SET_FEATURES &&
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tf->feature == SETFEATURES_XFER &&
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tf->nsect >= XFER_SW_DMA_0) {
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xfer_rate = ide_find_dma_mode(drive, tf->nsect);
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if (xfer_rate != tf->nsect) {
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err = -EINVAL;
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goto abort;
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}
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cmd.tf_flags |= IDE_TFLAG_SET_XFER;
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}
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err = ide_raw_taskfile(drive, &cmd, buf, args[3]);
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args[0] = tf->status;
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args[1] = tf->error;
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args[2] = tf->nsect;
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abort:
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if (copy_to_user((void __user *)arg, &args, 4))
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err = -EFAULT;
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if (buf) {
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if (copy_to_user((void __user *)(arg + 4), buf, bufsize))
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err = -EFAULT;
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kfree(buf);
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}
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return err;
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}
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static int ide_task_ioctl(ide_drive_t *drive, unsigned long arg)
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{
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void __user *p = (void __user *)arg;
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int err = 0;
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u8 args[7];
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struct ide_cmd cmd;
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if (copy_from_user(args, p, 7))
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return -EFAULT;
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memset(&cmd, 0, sizeof(cmd));
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memcpy(&cmd.tf.feature, &args[1], 6);
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cmd.tf.command = args[0];
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cmd.valid.out.tf = IDE_VALID_OUT_TF | IDE_VALID_DEVICE;
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cmd.valid.in.tf = IDE_VALID_IN_TF | IDE_VALID_DEVICE;
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err = ide_no_data_taskfile(drive, &cmd);
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args[0] = cmd.tf.command;
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memcpy(&args[1], &cmd.tf.feature, 6);
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if (copy_to_user(p, args, 7))
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err = -EFAULT;
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return err;
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}
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static int generic_drive_reset(ide_drive_t *drive)
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{
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struct request *rq;
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int ret = 0;
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rq = blk_get_request(drive->queue, READ, __GFP_RECLAIM);
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rq->cmd_type = REQ_TYPE_DRV_PRIV;
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rq->cmd_len = 1;
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rq->cmd[0] = REQ_DRIVE_RESET;
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if (blk_execute_rq(drive->queue, NULL, rq, 1))
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ret = rq->errors;
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blk_put_request(rq);
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return ret;
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}
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int generic_ide_ioctl(ide_drive_t *drive, struct block_device *bdev,
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unsigned int cmd, unsigned long arg)
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{
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int err;
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err = ide_setting_ioctl(drive, bdev, cmd, arg, ide_ioctl_settings);
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if (err != -EOPNOTSUPP)
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return err;
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switch (cmd) {
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case HDIO_OBSOLETE_IDENTITY:
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case HDIO_GET_IDENTITY:
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if (bdev != bdev->bd_contains)
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return -EINVAL;
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return ide_get_identity_ioctl(drive, cmd, arg);
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case HDIO_GET_NICE:
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return ide_get_nice_ioctl(drive, arg);
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case HDIO_SET_NICE:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return ide_set_nice_ioctl(drive, arg);
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#ifdef CONFIG_IDE_TASK_IOCTL
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case HDIO_DRIVE_TASKFILE:
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if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
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return -EACCES;
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if (drive->media == ide_disk)
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return ide_taskfile_ioctl(drive, arg);
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return -ENOMSG;
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#endif
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case HDIO_DRIVE_CMD:
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if (!capable(CAP_SYS_RAWIO))
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return -EACCES;
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return ide_cmd_ioctl(drive, arg);
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case HDIO_DRIVE_TASK:
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if (!capable(CAP_SYS_RAWIO))
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return -EACCES;
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return ide_task_ioctl(drive, arg);
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case HDIO_DRIVE_RESET:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return generic_drive_reset(drive);
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case HDIO_GET_BUSSTATE:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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if (put_user(BUSSTATE_ON, (long __user *)arg))
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return -EFAULT;
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return 0;
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case HDIO_SET_BUSSTATE:
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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return -EOPNOTSUPP;
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default:
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return -EINVAL;
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}
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}
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EXPORT_SYMBOL(generic_ide_ioctl);
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