Re: [PATCH 28/31] block: replace fmode_t with a block-specific type for block open flags
From: Christian Brauner <brauner@kernel.org>
Date: 2023-06-07 09:21:36
Also in:
dm-devel, linux-bcache, linux-btrfs, linux-f2fs-devel, linux-fsdevel, linux-nvme, linux-pm, linux-scsi, linux-um
On Tue, Jun 06, 2023 at 09:39:47AM +0200, Christoph Hellwig wrote:
The only overlap between the block open flags mapped into the fmode_t and other uses of fmode_t are FMODE_READ and FMODE_WRITE. Define a new
and FMODE_EXCL afaict
quoted hunk
blk_mode_t instead for use in blkdev_get_by_*, ->open and ->ioctl and stop abusing fmode_t. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/um/drivers/ubd_kern.c | 8 +++--- arch/xtensa/platforms/iss/simdisk.c | 2 +- block/bdev.c | 32 +++++++++++----------- block/blk-zoned.c | 8 +++--- block/blk.h | 11 ++++---- block/fops.c | 26 +++++++++++++----- block/genhd.c | 8 +++--- block/ioctl.c | 42 +++++++++-------------------- drivers/block/amiflop.c | 12 ++++----- drivers/block/aoe/aoeblk.c | 4 +-- drivers/block/ataflop.c | 25 +++++++++-------- drivers/block/drbd/drbd_main.c | 7 ++--- drivers/block/drbd/drbd_nl.c | 2 +- drivers/block/floppy.c | 28 +++++++++---------- drivers/block/loop.c | 22 +++++++-------- drivers/block/mtip32xx/mtip32xx.c | 4 +-- drivers/block/nbd.c | 4 +-- drivers/block/pktcdvd.c | 17 ++++++------ drivers/block/rbd.c | 2 +- drivers/block/rnbd/rnbd-clt.c | 4 +-- drivers/block/rnbd/rnbd-srv.c | 4 +-- drivers/block/sunvdc.c | 2 +- drivers/block/swim.c | 16 +++++------ drivers/block/swim3.c | 24 ++++++++--------- drivers/block/ublk_drv.c | 2 +- drivers/block/xen-blkback/xenbus.c | 2 +- drivers/block/xen-blkfront.c | 2 +- drivers/block/z2ram.c | 2 +- drivers/block/zram/zram_drv.c | 6 ++--- drivers/cdrom/cdrom.c | 4 +-- drivers/cdrom/gdrom.c | 4 +-- drivers/md/bcache/bcache.h | 2 +- drivers/md/bcache/request.c | 4 +-- drivers/md/bcache/super.c | 6 ++--- drivers/md/dm-cache-target.c | 12 ++++----- drivers/md/dm-clone-target.c | 10 +++---- drivers/md/dm-core.h | 7 +++-- drivers/md/dm-era-target.c | 6 +++-- drivers/md/dm-ioctl.c | 10 +++---- drivers/md/dm-snap.c | 4 +-- drivers/md/dm-table.c | 11 ++++---- drivers/md/dm-thin.c | 9 ++++--- drivers/md/dm-verity-fec.c | 2 +- drivers/md/dm-verity-target.c | 6 ++--- drivers/md/dm.c | 10 +++---- drivers/md/dm.h | 2 +- drivers/md/md.c | 8 +++--- drivers/mmc/core/block.c | 8 +++--- drivers/mtd/devices/block2mtd.c | 4 +-- drivers/mtd/mtd_blkdevs.c | 4 +-- drivers/mtd/ubi/block.c | 5 ++-- drivers/nvme/host/core.c | 2 +- drivers/nvme/host/ioctl.c | 8 +++--- drivers/nvme/host/multipath.c | 2 +- drivers/nvme/host/nvme.h | 4 +-- drivers/nvme/target/io-cmd-bdev.c | 2 +- drivers/s390/block/dasd.c | 6 ++--- drivers/s390/block/dasd_genhd.c | 3 ++- drivers/s390/block/dasd_int.h | 3 ++- drivers/s390/block/dasd_ioctl.c | 2 +- drivers/s390/block/dcssblk.c | 4 +-- drivers/scsi/sd.c | 19 ++++++------- drivers/scsi/sr.c | 10 +++---- drivers/target/target_core_iblock.c | 5 ++-- drivers/target/target_core_pscsi.c | 4 +-- fs/btrfs/dev-replace.c | 2 +- fs/btrfs/super.c | 4 +-- fs/btrfs/volumes.c | 16 +++++------ fs/btrfs/volumes.h | 4 +-- fs/erofs/super.c | 2 +- fs/ext4/super.c | 2 +- fs/jfs/jfs_logmgr.c | 2 +- fs/nfs/blocklayout/dev.c | 5 ++-- fs/ocfs2/cluster/heartbeat.c | 3 ++- fs/reiserfs/journal.c | 4 +-- fs/xfs/xfs_super.c | 2 +- include/linux/blkdev.h | 30 ++++++++++++++++----- include/linux/cdrom.h | 3 ++- include/linux/device-mapper.h | 8 +++--- kernel/power/swap.c | 6 ++--- mm/swapfile.c | 2 +- 81 files changed, 324 insertions(+), 311 deletions(-)diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c index 20c1a16199c503..50206feac577d5 100644 --- a/arch/um/drivers/ubd_kern.c +++ b/arch/um/drivers/ubd_kern.c@@ -108,9 +108,9 @@ static inline void ubd_set_bit(__u64 bit, unsigned char *data) static DEFINE_MUTEX(ubd_lock); static DEFINE_MUTEX(ubd_mutex); /* replaces BKL, might not be needed */ -static int ubd_open(struct gendisk *disk, fmode_t mode); +static int ubd_open(struct gendisk *disk, blk_mode_t mode); static void ubd_release(struct gendisk *disk); -static int ubd_ioctl(struct block_device *bdev, fmode_t mode, +static int ubd_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg); static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo);@@ -1154,7 +1154,7 @@ static int __init ubd_driver_init(void){ device_initcall(ubd_driver_init); -static int ubd_open(struct gendisk *disk, fmode_t mode) +static int ubd_open(struct gendisk *disk, blk_mode_t mode) { struct ubd *ubd_dev = disk->private_data; int err = 0;@@ -1389,7 +1389,7 @@ static int ubd_getgeo(struct block_device *bdev, struct hd_geometry *geo) return 0; } -static int ubd_ioctl(struct block_device *bdev, fmode_t mode, +static int ubd_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg) { struct ubd *ubd_dev = bdev->bd_disk->private_data;diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c index 2ad9da3de0d90f..178cf96ca10acb 100644 --- a/arch/xtensa/platforms/iss/simdisk.c +++ b/arch/xtensa/platforms/iss/simdisk.c@@ -120,7 +120,7 @@ static void simdisk_submit_bio(struct bio *bio) bio_endio(bio); } -static int simdisk_open(struct gendisk *disk, fmode_t mode) +static int simdisk_open(struct gendisk *disk, blk_mode_t mode) { struct simdisk *dev = disk->private_data;diff --git a/block/bdev.c b/block/bdev.c index db63e5bcc46ffa..bd558a9ba3cd97 100644 --- a/block/bdev.c +++ b/block/bdev.c@@ -93,7 +93,7 @@ EXPORT_SYMBOL(invalidate_bdev); * Drop all buffers & page cache for given bdev range. This function bails * with error if bdev has other exclusive owner (such as filesystem). */ -int truncate_bdev_range(struct block_device *bdev, fmode_t mode, +int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode, loff_t lstart, loff_t lend) { /*@@ -101,14 +101,14 @@ int truncate_bdev_range(struct block_device *bdev, fmode_t mode, * while we discard the buffer cache to avoid discarding buffers * under live filesystem. */ - if (!(mode & FMODE_EXCL)) { + if (!(mode & BLK_OPEN_EXCL)) { int err = bd_prepare_to_claim(bdev, truncate_bdev_range, NULL); if (err) goto invalidate; } truncate_inode_pages_range(bdev->bd_inode->i_mapping, lstart, lend); - if (!(mode & FMODE_EXCL)) + if (!(mode & BLK_OPEN_EXCL)) bd_abort_claiming(bdev, truncate_bdev_range); return 0;@@ -647,7 +647,7 @@ static void blkdev_flush_mapping(struct block_device *bdev) bdev_write_inode(bdev); } -static int blkdev_get_whole(struct block_device *bdev, fmode_t mode) +static int blkdev_get_whole(struct block_device *bdev, blk_mode_t mode) { struct gendisk *disk = bdev->bd_disk; int ret;@@ -679,7 +679,7 @@ static void blkdev_put_whole(struct block_device *bdev) bdev->bd_disk->fops->release(bdev->bd_disk); } -static int blkdev_get_part(struct block_device *part, fmode_t mode) +static int blkdev_get_part(struct block_device *part, blk_mode_t mode) { struct gendisk *disk = part->bd_disk; int ret;@@ -743,11 +743,11 @@ void blkdev_put_no_open(struct block_device *bdev) { put_device(&bdev->bd_device); } - +
nit: This is whitespace damage, I think. There's a trailing tab.
quoted hunk
/** * blkdev_get_by_dev - open a block device by device number * @dev: device number of block device to open - * @mode: FMODE_* mask + * @mode: open mode (BLK_OPEN_*) * @holder: exclusive holder identifier * @hops: holder operations *@@ -765,7 +765,7 @@ void blkdev_put_no_open(struct block_device *bdev) * RETURNS: * Reference to the block_device on success, ERR_PTR(-errno) on failure. */ -struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder, +struct block_device *blkdev_get_by_dev(dev_t dev, blk_mode_t mode, void *holder, const struct blk_holder_ops *hops) { bool unblock_events = true;@@ -775,8 +775,8 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder, ret = devcgroup_check_permission(DEVCG_DEV_BLOCK, MAJOR(dev), MINOR(dev), - ((mode & FMODE_READ) ? DEVCG_ACC_READ : 0) | - ((mode & FMODE_WRITE) ? DEVCG_ACC_WRITE : 0)); + ((mode & BLK_OPEN_READ) ? DEVCG_ACC_READ : 0) | + ((mode & BLK_OPEN_WRITE) ? DEVCG_ACC_WRITE : 0)); if (ret) return ERR_PTR(ret);@@ -786,12 +786,12 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder, disk = bdev->bd_disk; if (holder) { - mode |= FMODE_EXCL; + mode |= BLK_OPEN_EXCL; ret = bd_prepare_to_claim(bdev, holder, hops); if (ret) goto put_blkdev; } else { - if (WARN_ON_ONCE(mode & FMODE_EXCL)) { + if (WARN_ON_ONCE(mode & BLK_OPEN_EXCL)) { ret = -EIO; goto put_blkdev; }@@ -821,7 +821,7 @@ struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder, * writeable reference is too fragile given the way @mode is * used in blkdev_get/put(). */ - if ((mode & FMODE_WRITE) && !bdev->bd_write_holder && + if ((mode & BLK_OPEN_WRITE) && !bdev->bd_write_holder && (disk->event_flags & DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE)) { bdev->bd_write_holder = true; unblock_events = false;@@ -848,7 +848,7 @@ EXPORT_SYMBOL(blkdev_get_by_dev); /** * blkdev_get_by_path - open a block device by name * @path: path to the block device to open - * @mode: FMODE_* mask + * @mode: open mode (BLK_OPEN_*) * @holder: exclusive holder identifier * * Open the block device described by the device file at @path. If @holder is@@ -861,7 +861,7 @@ EXPORT_SYMBOL(blkdev_get_by_dev); * RETURNS: * Reference to the block_device on success, ERR_PTR(-errno) on failure. */ -struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, +struct block_device *blkdev_get_by_path(const char *path, blk_mode_t mode, void *holder, const struct blk_holder_ops *hops) { struct block_device *bdev;@@ -873,7 +873,7 @@ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, return ERR_PTR(error); bdev = blkdev_get_by_dev(dev, mode, holder, hops); - if (!IS_ERR(bdev) && (mode & FMODE_WRITE) && bdev_read_only(bdev)) { + if (!IS_ERR(bdev) && (mode & BLK_OPEN_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, holder); return ERR_PTR(-EACCES); }diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 02cc2c629ac9be..0f9f97cdddd99c 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c@@ -356,8 +356,8 @@ int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd, return 0; } -static int blkdev_truncate_zone_range(struct block_device *bdev, fmode_t mode, - const struct blk_zone_range *zrange) +static int blkdev_truncate_zone_range(struct block_device *bdev, + blk_mode_t mode, const struct blk_zone_range *zrange) { loff_t start, end;@@ -376,7 +376,7 @@ static int blkdev_truncate_zone_range(struct block_device *bdev, fmode_t mode, * BLKRESETZONE, BLKOPENZONE, BLKCLOSEZONE and BLKFINISHZONE ioctl processing. * Called from blkdev_ioctl. */ -int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, +int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg) { void __user *argp = (void __user *)arg;@@ -390,7 +390,7 @@ int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, if (!bdev_is_zoned(bdev)) return -ENOTTY; - if (!(mode & FMODE_WRITE)) + if (!(mode & BLK_OPEN_WRITE)) return -EBADF; if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))diff --git a/block/blk.h b/block/blk.h index e28d5d67d31a28..768852a84fefb3 100644 --- a/block/blk.h +++ b/block/blk.h@@ -396,7 +396,7 @@ void disk_free_zone_bitmaps(struct gendisk *disk); void disk_clear_zone_settings(struct gendisk *disk); int blkdev_report_zones_ioctl(struct block_device *bdev, unsigned int cmd, unsigned long arg); -int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, +int blkdev_zone_mgmt_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd, unsigned long arg); #else /* CONFIG_BLK_DEV_ZONED */ static inline void disk_free_zone_bitmaps(struct gendisk *disk) {}@@ -407,7 +407,7 @@ static inline int blkdev_report_zones_ioctl(struct block_device *bdev, return -ENOTTY; } static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, - fmode_t mode, unsigned int cmd, unsigned long arg) + blk_mode_t mode, unsigned int cmd, unsigned long arg) { return -ENOTTY; }@@ -451,7 +451,7 @@ static inline void bio_release_page(struct bio *bio, struct page *page) struct request_queue *blk_alloc_queue(int node_id); -int disk_scan_partitions(struct gendisk *disk, fmode_t mode); +int disk_scan_partitions(struct gendisk *disk, blk_mode_t mode); int disk_alloc_events(struct gendisk *disk); void disk_add_events(struct gendisk *disk);@@ -466,8 +466,9 @@ extern struct device_attribute dev_attr_events_poll_msecs; extern struct attribute_group blk_trace_attr_group; -int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, - loff_t lend); +blk_mode_t file_to_blk_mode(struct file *file); +int truncate_bdev_range(struct block_device *bdev, blk_mode_t mode, + loff_t lstart, loff_t lend); long blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg); long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg);diff --git a/block/fops.c b/block/fops.c index 9f26e25bafa172..928c37a214f785 100644 --- a/block/fops.c +++ b/block/fops.c@@ -470,6 +470,24 @@ static int blkdev_fsync(struct file *filp, loff_t start, loff_t end, return error; } +blk_mode_t file_to_blk_mode(struct file *file) +{ + blk_mode_t mode = 0; + + if (file->f_mode & FMODE_READ) + mode |= BLK_OPEN_READ; + if (file->f_mode & FMODE_WRITE) + mode |= BLK_OPEN_WRITE; + if (file->f_mode & FMODE_EXCL) + mode |= BLK_OPEN_EXCL; + if ((file->f_flags & O_ACCMODE) == 3)
I really don't like magic numbers like this. Groan, O_RDONLY being defined as 0 strikes again... Becuase of this quirk we internally map O_RDONLY(0) -> FMODE_READ(1) O_WRONLY(1) -> FMODE_WRITE(2) O_RDWR(3) -> (FMODE_READ | FMODE_WRITE) so checking for the raw 3 here is confusing in addition to being a magic number as it could give the impression that what's checked here is (O_WRONLY | O_RDWR) which doesn't make sense... So my perference would be in descending order of preference: (file->f_flags & O_ACCMODE) == (FMODE_READ | FMODE_WRITE) or while a little less clear but informative enough for people familiar with the O_RDONLY quirk: if ((file->f_flags & O_ACCMODE) == O_ACCMODE)