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block: add a sb_open_mode helper
Add a helper to return the open flags for blkdev_get_by* for passed in super block flags instead of open coding the logic in many places. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.de> Acked-by: Christian Brauner <brauner@kernel.org> Link: https://lore.kernel.org/r/20230608110258.189493-17-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
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2736e8eeb0
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3f0b3e785e
4 changed files with 14 additions and 20 deletions
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@ -1440,12 +1440,9 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
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struct btrfs_fs_devices *fs_devices = NULL;
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struct btrfs_fs_devices *fs_devices = NULL;
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struct btrfs_fs_info *fs_info = NULL;
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struct btrfs_fs_info *fs_info = NULL;
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void *new_sec_opts = NULL;
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void *new_sec_opts = NULL;
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fmode_t mode = FMODE_READ;
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fmode_t mode = sb_open_mode(flags);
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int error = 0;
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int error = 0;
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if (!(flags & SB_RDONLY))
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mode |= FMODE_WRITE;
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if (data) {
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if (data) {
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error = security_sb_eat_lsm_opts(data, &new_sec_opts);
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error = security_sb_eat_lsm_opts(data, &new_sec_opts);
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if (error)
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if (error)
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@ -1278,14 +1278,11 @@ nilfs_mount(struct file_system_type *fs_type, int flags,
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{
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{
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struct nilfs_super_data sd;
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struct nilfs_super_data sd;
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struct super_block *s;
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struct super_block *s;
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fmode_t mode = FMODE_READ;
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struct dentry *root_dentry;
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struct dentry *root_dentry;
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int err, s_new = false;
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int err, s_new = false;
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if (!(flags & SB_RDONLY))
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sd.bdev = blkdev_get_by_path(dev_name, sb_open_mode(flags), fs_type,
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mode |= FMODE_WRITE;
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NULL);
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sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type, NULL);
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if (IS_ERR(sd.bdev))
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if (IS_ERR(sd.bdev))
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return ERR_CAST(sd.bdev);
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return ERR_CAST(sd.bdev);
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15
fs/super.c
15
fs/super.c
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@ -1255,17 +1255,13 @@ int get_tree_bdev(struct fs_context *fc,
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{
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{
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struct block_device *bdev;
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struct block_device *bdev;
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struct super_block *s;
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struct super_block *s;
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fmode_t mode = FMODE_READ;
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int error = 0;
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int error = 0;
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if (!(fc->sb_flags & SB_RDONLY))
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mode |= FMODE_WRITE;
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if (!fc->source)
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if (!fc->source)
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return invalf(fc, "No source specified");
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return invalf(fc, "No source specified");
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bdev = blkdev_get_by_path(fc->source, mode, fc->fs_type,
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bdev = blkdev_get_by_path(fc->source, sb_open_mode(fc->sb_flags),
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&fs_holder_ops);
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fc->fs_type, &fs_holder_ops);
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if (IS_ERR(bdev)) {
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if (IS_ERR(bdev)) {
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errorf(fc, "%s: Can't open blockdev", fc->source);
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errorf(fc, "%s: Can't open blockdev", fc->source);
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return PTR_ERR(bdev);
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return PTR_ERR(bdev);
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@ -1344,13 +1340,10 @@ struct dentry *mount_bdev(struct file_system_type *fs_type,
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{
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{
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struct block_device *bdev;
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struct block_device *bdev;
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struct super_block *s;
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struct super_block *s;
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fmode_t mode = FMODE_READ;
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int error = 0;
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int error = 0;
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if (!(flags & SB_RDONLY))
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bdev = blkdev_get_by_path(dev_name, sb_open_mode(flags), fs_type,
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mode |= FMODE_WRITE;
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&fs_holder_ops);
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bdev = blkdev_get_by_path(dev_name, mode, fs_type, &fs_holder_ops);
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if (IS_ERR(bdev))
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if (IS_ERR(bdev))
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return ERR_CAST(bdev);
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return ERR_CAST(bdev);
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@ -1473,6 +1473,13 @@ struct blk_holder_ops {
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void (*mark_dead)(struct block_device *bdev);
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void (*mark_dead)(struct block_device *bdev);
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};
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};
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/*
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* Return the correct open flags for blkdev_get_by_* for super block flags
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* as stored in sb->s_flags.
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*/
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#define sb_open_mode(flags) \
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(FMODE_READ | (((flags) & SB_RDONLY) ? 0 : FMODE_WRITE))
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struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder,
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struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder,
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const struct blk_holder_ops *hops);
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const struct blk_holder_ops *hops);
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struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
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struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
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