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fs/block_dev.c
53.4 KB
1da177e4c Linux-2.6.12-rc2 |
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/* * linux/fs/block_dev.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE */ |
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#include <linux/init.h> #include <linux/mm.h> #include <linux/fcntl.h> #include <linux/slab.h> #include <linux/kmod.h> #include <linux/major.h> |
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#include <linux/device_cgroup.h> |
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#include <linux/highmem.h> #include <linux/blkdev.h> |
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#include <linux/backing-dev.h> |
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#include <linux/module.h> #include <linux/blkpg.h> |
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#include <linux/magic.h> |
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#include <linux/dax.h> |
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#include <linux/buffer_head.h> |
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#include <linux/swap.h> |
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#include <linux/pagevec.h> |
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#include <linux/writeback.h> |
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#include <linux/mpage.h> #include <linux/mount.h> #include <linux/uio.h> #include <linux/namei.h> |
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#include <linux/log2.h> |
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#include <linux/cleancache.h> |
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#include <linux/dax.h> |
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#include <linux/badblocks.h> |
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#include <linux/task_io_accounting_ops.h> |
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#include <linux/falloc.h> |
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#include <linux/uaccess.h> |
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#include "internal.h" |
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struct bdev_inode { struct block_device bdev; struct inode vfs_inode; }; |
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static const struct address_space_operations def_blk_aops; |
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static inline struct bdev_inode *BDEV_I(struct inode *inode) { return container_of(inode, struct bdev_inode, vfs_inode); } |
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struct block_device *I_BDEV(struct inode *inode) |
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{ return &BDEV_I(inode)->bdev; } |
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EXPORT_SYMBOL(I_BDEV); |
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void __vfs_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) { struct va_format vaf; va_list args; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; printk_ratelimited("%sVFS (%s): %pV ", prefix, sb->s_id, &vaf); va_end(args); } |
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static void bdev_write_inode(struct block_device *bdev) |
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{ |
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struct inode *inode = bdev->bd_inode; int ret; |
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spin_lock(&inode->i_lock); while (inode->i_state & I_DIRTY) { spin_unlock(&inode->i_lock); |
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ret = write_inode_now(inode, true); if (ret) { char name[BDEVNAME_SIZE]; pr_warn_ratelimited("VFS: Dirty inode writeback failed " "for block device %s (err=%d). ", bdevname(bdev, name), ret); } |
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spin_lock(&inode->i_lock); } spin_unlock(&inode->i_lock); } |
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/* Kill _all_ buffers and pagecache , dirty or not.. */ |
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void kill_bdev(struct block_device *bdev) |
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{ |
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struct address_space *mapping = bdev->bd_inode->i_mapping; |
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if (mapping->nrpages == 0 && mapping->nrexceptional == 0) |
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return; |
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|
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invalidate_bh_lrus(); |
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truncate_inode_pages(mapping, 0); |
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} |
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EXPORT_SYMBOL(kill_bdev); /* Invalidate clean unused buffers and pagecache. */ void invalidate_bdev(struct block_device *bdev) { struct address_space *mapping = bdev->bd_inode->i_mapping; |
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if (mapping->nrpages) { invalidate_bh_lrus(); lru_add_drain_all(); /* make sure all lru add caches are flushed */ invalidate_mapping_pages(mapping, 0, -1); } |
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/* 99% of the time, we don't need to flush the cleancache on the bdev. * But, for the strange corners, lets be cautious */ |
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cleancache_invalidate_inode(mapping); |
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} EXPORT_SYMBOL(invalidate_bdev); |
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int set_blocksize(struct block_device *bdev, int size) { /* Size must be a power of two, and between 512 and PAGE_SIZE */ |
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if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size)) |
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return -EINVAL; /* Size cannot be smaller than the size supported by the device */ |
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if (size < bdev_logical_block_size(bdev)) |
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return -EINVAL; /* Don't change the size if it is same as current */ if (bdev->bd_block_size != size) { sync_blockdev(bdev); bdev->bd_block_size = size; bdev->bd_inode->i_blkbits = blksize_bits(size); kill_bdev(bdev); } return 0; } EXPORT_SYMBOL(set_blocksize); int sb_set_blocksize(struct super_block *sb, int size) { |
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if (set_blocksize(sb->s_bdev, size)) return 0; /* If we get here, we know size is power of two * and it's value is between 512 and PAGE_SIZE */ sb->s_blocksize = size; |
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sb->s_blocksize_bits = blksize_bits(size); |
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return sb->s_blocksize; } EXPORT_SYMBOL(sb_set_blocksize); int sb_min_blocksize(struct super_block *sb, int size) { |
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int minsize = bdev_logical_block_size(sb->s_bdev); |
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if (size < minsize) size = minsize; return sb_set_blocksize(sb, size); } EXPORT_SYMBOL(sb_min_blocksize); static int blkdev_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh, int create) { |
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bh->b_bdev = I_BDEV(inode); bh->b_blocknr = iblock; set_buffer_mapped(bh); return 0; } |
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static struct inode *bdev_file_inode(struct file *file) { return file->f_mapping->host; } |
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static unsigned int dio_bio_write_op(struct kiocb *iocb) { unsigned int op = REQ_OP_WRITE | REQ_SYNC | REQ_IDLE; /* avoid the need for a I/O completion work item */ if (iocb->ki_flags & IOCB_DSYNC) op |= REQ_FUA; return op; } |
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#define DIO_INLINE_BIO_VECS 4 static void blkdev_bio_end_io_simple(struct bio *bio) { struct task_struct *waiter = bio->bi_private; WRITE_ONCE(bio->bi_private, NULL); wake_up_process(waiter); } static ssize_t __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) { struct file *file = iocb->ki_filp; struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
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struct bio_vec inline_vecs[DIO_INLINE_BIO_VECS], *vecs, *bvec; |
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loff_t pos = iocb->ki_pos; bool should_dirty = false; struct bio bio; ssize_t ret; blk_qc_t qc; int i; |
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if ((pos | iov_iter_alignment(iter)) & (bdev_logical_block_size(bdev) - 1)) |
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return -EINVAL; |
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if (nr_pages <= DIO_INLINE_BIO_VECS) vecs = inline_vecs; else { vecs = kmalloc(nr_pages * sizeof(struct bio_vec), GFP_KERNEL); if (!vecs) return -ENOMEM; } |
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bio_init(&bio, vecs, nr_pages); |
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bio_set_dev(&bio, bdev); |
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bio.bi_iter.bi_sector = pos >> 9; |
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bio.bi_write_hint = iocb->ki_hint; |
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bio.bi_private = current; bio.bi_end_io = blkdev_bio_end_io_simple; ret = bio_iov_iter_get_pages(&bio, iter); if (unlikely(ret)) |
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goto out; |
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ret = bio.bi_iter.bi_size; if (iov_iter_rw(iter) == READ) { |
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bio.bi_opf = REQ_OP_READ; |
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if (iter_is_iovec(iter)) should_dirty = true; } else { |
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bio.bi_opf = dio_bio_write_op(iocb); |
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task_io_account_write(ret); } qc = submit_bio(&bio); for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); if (!READ_ONCE(bio.bi_private)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || |
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!blk_poll(bdev_get_queue(bdev), qc)) |
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io_schedule(); } __set_current_state(TASK_RUNNING); bio_for_each_segment_all(bvec, &bio, i) { if (should_dirty && !PageCompound(bvec->bv_page)) set_page_dirty_lock(bvec->bv_page); put_page(bvec->bv_page); } |
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if (unlikely(bio.bi_status)) |
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ret = blk_status_to_errno(bio.bi_status); |
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|
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out: if (vecs != inline_vecs) kfree(vecs); |
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bio_uninit(&bio); |
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return ret; } |
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struct blkdev_dio { union { struct kiocb *iocb; struct task_struct *waiter; }; size_t size; atomic_t ref; bool multi_bio : 1; bool should_dirty : 1; bool is_sync : 1; struct bio bio; }; static struct bio_set *blkdev_dio_pool __read_mostly; static void blkdev_bio_end_io(struct bio *bio) { struct blkdev_dio *dio = bio->bi_private; bool should_dirty = dio->should_dirty; if (dio->multi_bio && !atomic_dec_and_test(&dio->ref)) { |
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if (bio->bi_status && !dio->bio.bi_status) dio->bio.bi_status = bio->bi_status; |
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} else { if (!dio->is_sync) { struct kiocb *iocb = dio->iocb; |
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ssize_t ret; |
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|
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if (likely(!dio->bio.bi_status)) { |
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ret = dio->size; iocb->ki_pos += ret; |
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} else { ret = blk_status_to_errno(dio->bio.bi_status); |
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} dio->iocb->ki_complete(iocb, ret, 0); bio_put(&dio->bio); } else { struct task_struct *waiter = dio->waiter; WRITE_ONCE(dio->waiter, NULL); wake_up_process(waiter); } } if (should_dirty) { bio_check_pages_dirty(bio); } else { struct bio_vec *bvec; int i; bio_for_each_segment_all(bvec, bio, i) put_page(bvec->bv_page); bio_put(bio); } } |
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static ssize_t |
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__blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) |
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{ struct file *file = iocb->ki_filp; |
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struct inode *inode = bdev_file_inode(file); |
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struct block_device *bdev = I_BDEV(inode); |
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struct blk_plug plug; |
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struct blkdev_dio *dio; struct bio *bio; |
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bool is_read = (iov_iter_rw(iter) == READ), is_sync; |
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loff_t pos = iocb->ki_pos; blk_qc_t qc = BLK_QC_T_NONE; |
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int ret = 0; |
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|
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if ((pos | iov_iter_alignment(iter)) & (bdev_logical_block_size(bdev) - 1)) |
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return -EINVAL; bio = bio_alloc_bioset(GFP_KERNEL, nr_pages, blkdev_dio_pool); bio_get(bio); /* extra ref for the completion handler */ dio = container_of(bio, struct blkdev_dio, bio); |
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dio->is_sync = is_sync = is_sync_kiocb(iocb); |
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if (dio->is_sync) dio->waiter = current; else dio->iocb = iocb; dio->size = 0; dio->multi_bio = false; dio->should_dirty = is_read && (iter->type == ITER_IOVEC); |
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blk_start_plug(&plug); |
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for (;;) { |
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bio_set_dev(bio, bdev); |
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bio->bi_iter.bi_sector = pos >> 9; |
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bio->bi_write_hint = iocb->ki_hint; |
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bio->bi_private = dio; bio->bi_end_io = blkdev_bio_end_io; ret = bio_iov_iter_get_pages(bio, iter); if (unlikely(ret)) { |
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bio->bi_status = BLK_STS_IOERR; |
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bio_endio(bio); break; } if (is_read) { bio->bi_opf = REQ_OP_READ; if (dio->should_dirty) bio_set_pages_dirty(bio); } else { bio->bi_opf = dio_bio_write_op(iocb); task_io_account_write(bio->bi_iter.bi_size); } dio->size += bio->bi_iter.bi_size; pos += bio->bi_iter.bi_size; nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES); if (!nr_pages) { qc = submit_bio(bio); break; } if (!dio->multi_bio) { dio->multi_bio = true; atomic_set(&dio->ref, 2); } else { atomic_inc(&dio->ref); } submit_bio(bio); bio = bio_alloc(GFP_KERNEL, nr_pages); } |
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blk_finish_plug(&plug); |
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|
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if (!is_sync) |
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return -EIOCBQUEUED; for (;;) { set_current_state(TASK_UNINTERRUPTIBLE); if (!READ_ONCE(dio->waiter)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || |
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!blk_poll(bdev_get_queue(bdev), qc)) |
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io_schedule(); } __set_current_state(TASK_RUNNING); |
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if (!ret) |
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ret = blk_status_to_errno(dio->bio.bi_status); |
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if (likely(!ret)) |
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ret = dio->size; |
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bio_put(&dio->bio); return ret; } static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { |
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int nr_pages; |
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|
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nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES + 1); |
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if (!nr_pages) return 0; |
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if (is_sync_kiocb(iocb) && nr_pages <= BIO_MAX_PAGES) |
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return __blkdev_direct_IO_simple(iocb, iter, nr_pages); |
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return __blkdev_direct_IO(iocb, iter, min(nr_pages, BIO_MAX_PAGES)); } static __init int blkdev_init(void) { |
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blkdev_dio_pool = bioset_create(4, offsetof(struct blkdev_dio, bio), BIOSET_NEED_BVECS); |
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if (!blkdev_dio_pool) return -ENOMEM; return 0; |
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} |
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module_init(blkdev_init); |
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|
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int __sync_blockdev(struct block_device *bdev, int wait) { if (!bdev) return 0; if (!wait) return filemap_flush(bdev->bd_inode->i_mapping); return filemap_write_and_wait(bdev->bd_inode->i_mapping); } |
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/* * Write out and wait upon all the dirty data associated with a block * device via its mapping. Does not take the superblock lock. */ int sync_blockdev(struct block_device *bdev) { |
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return __sync_blockdev(bdev, 1); |
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} EXPORT_SYMBOL(sync_blockdev); /* * Write out and wait upon all dirty data associated with this * device. Filesystem data as well as the underlying block * device. Takes the superblock lock. */ int fsync_bdev(struct block_device *bdev) { struct super_block *sb = get_super(bdev); if (sb) { |
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int res = sync_filesystem(sb); |
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drop_super(sb); return res; } return sync_blockdev(bdev); } |
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EXPORT_SYMBOL(fsync_bdev); |
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/** * freeze_bdev -- lock a filesystem and force it into a consistent state * @bdev: blockdevice to lock * |
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* If a superblock is found on this device, we take the s_umount semaphore * on it to make sure nobody unmounts until the snapshot creation is done. * The reference counter (bd_fsfreeze_count) guarantees that only the last * unfreeze process can unfreeze the frozen filesystem actually when multiple * freeze requests arrive simultaneously. It counts up in freeze_bdev() and * count down in thaw_bdev(). When it becomes 0, thaw_bdev() will unfreeze * actually. */ struct super_block *freeze_bdev(struct block_device *bdev) { struct super_block *sb; int error = 0; mutex_lock(&bdev->bd_fsfreeze_mutex); |
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if (++bdev->bd_fsfreeze_count > 1) { /* * We don't even need to grab a reference - the first call * to freeze_bdev grab an active reference and only the last * thaw_bdev drops it. */ |
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sb = get_super(bdev); |
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if (sb) drop_super(sb); |
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mutex_unlock(&bdev->bd_fsfreeze_mutex); return sb; } sb = get_active_super(bdev); if (!sb) goto out; |
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503 504 505 506 |
if (sb->s_op->freeze_super) error = sb->s_op->freeze_super(sb); else error = freeze_super(sb); |
18e9e5104 Introduce freeze_... |
507 508 509 |
if (error) { deactivate_super(sb); bdev->bd_fsfreeze_count--; |
585d3bc06 fs: move bdev cod... |
510 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
18e9e5104 Introduce freeze_... |
511 |
return ERR_PTR(error); |
585d3bc06 fs: move bdev cod... |
512 |
} |
18e9e5104 Introduce freeze_... |
513 |
deactivate_super(sb); |
4504230a7 freeze_bdev: grab... |
514 |
out: |
585d3bc06 fs: move bdev cod... |
515 516 |
sync_blockdev(bdev); mutex_unlock(&bdev->bd_fsfreeze_mutex); |
4fadd7bb2 freeze_bdev: kill... |
517 |
return sb; /* thaw_bdev releases s->s_umount */ |
585d3bc06 fs: move bdev cod... |
518 519 520 521 522 523 524 525 526 527 528 529 |
} EXPORT_SYMBOL(freeze_bdev); /** * thaw_bdev -- unlock filesystem * @bdev: blockdevice to unlock * @sb: associated superblock * * Unlocks the filesystem and marks it writeable again after freeze_bdev(). */ int thaw_bdev(struct block_device *bdev, struct super_block *sb) { |
4504230a7 freeze_bdev: grab... |
530 |
int error = -EINVAL; |
585d3bc06 fs: move bdev cod... |
531 532 |
mutex_lock(&bdev->bd_fsfreeze_mutex); |
4504230a7 freeze_bdev: grab... |
533 |
if (!bdev->bd_fsfreeze_count) |
18e9e5104 Introduce freeze_... |
534 |
goto out; |
4504230a7 freeze_bdev: grab... |
535 536 537 |
error = 0; if (--bdev->bd_fsfreeze_count > 0) |
18e9e5104 Introduce freeze_... |
538 |
goto out; |
4504230a7 freeze_bdev: grab... |
539 540 |
if (!sb) |
18e9e5104 Introduce freeze_... |
541 |
goto out; |
4504230a7 freeze_bdev: grab... |
542 |
|
48b6bca6b fs: add freeze_su... |
543 544 545 546 |
if (sb->s_op->thaw_super) error = sb->s_op->thaw_super(sb); else error = thaw_super(sb); |
997198ba1 fs/block_dev.c: r... |
547 |
if (error) |
18e9e5104 Introduce freeze_... |
548 |
bdev->bd_fsfreeze_count++; |
18e9e5104 Introduce freeze_... |
549 |
out: |
585d3bc06 fs: move bdev cod... |
550 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
997198ba1 fs/block_dev.c: r... |
551 |
return error; |
585d3bc06 fs: move bdev cod... |
552 553 |
} EXPORT_SYMBOL(thaw_bdev); |
1da177e4c Linux-2.6.12-rc2 |
554 555 556 557 558 559 560 561 562 |
static int blkdev_writepage(struct page *page, struct writeback_control *wbc) { return block_write_full_page(page, blkdev_get_block, wbc); } static int blkdev_readpage(struct file * file, struct page * page) { return block_read_full_page(page, blkdev_get_block); } |
447f05bb4 block_dev: implem... |
563 564 565 566 567 |
static int blkdev_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block); } |
6272b5a58 block_dev: conver... |
568 569 570 |
static int blkdev_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
1da177e4c Linux-2.6.12-rc2 |
571 |
{ |
155130a4f get rid of block_... |
572 573 |
return block_write_begin(mapping, pos, len, flags, pagep, blkdev_get_block); |
1da177e4c Linux-2.6.12-rc2 |
574 |
} |
6272b5a58 block_dev: conver... |
575 576 577 |
static int blkdev_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
1da177e4c Linux-2.6.12-rc2 |
578 |
{ |
6272b5a58 block_dev: conver... |
579 580 581 582 |
int ret; ret = block_write_end(file, mapping, pos, len, copied, page, fsdata); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
583 |
put_page(page); |
6272b5a58 block_dev: conver... |
584 585 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
586 587 588 589 |
} /* * private llseek: |
496ad9aa8 new helper: file_... |
590 |
* for a block special file file_inode(file)->i_size is zero |
1da177e4c Linux-2.6.12-rc2 |
591 592 |
* so we compute the size by hand (just as in block_read/write above) */ |
965c8e59c lseek: the "whenc... |
593 |
static loff_t block_llseek(struct file *file, loff_t offset, int whence) |
1da177e4c Linux-2.6.12-rc2 |
594 |
{ |
4ebb16ca9 block: introduce ... |
595 |
struct inode *bd_inode = bdev_file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
596 |
loff_t retval; |
5955102c9 wrappers for ->i_... |
597 |
inode_lock(bd_inode); |
5d48f3a2d block_dev: switch... |
598 |
retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode)); |
5955102c9 wrappers for ->i_... |
599 |
inode_unlock(bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
600 601 602 |
return retval; } |
02c24a821 fs: push i_mutex ... |
603 |
int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
1da177e4c Linux-2.6.12-rc2 |
604 |
{ |
4ebb16ca9 block: introduce ... |
605 |
struct inode *bd_inode = bdev_file_inode(filp); |
b8af67e26 fs/block_dev.c: f... |
606 |
struct block_device *bdev = I_BDEV(bd_inode); |
ab0a9735e blkdev: flush dis... |
607 |
int error; |
da5aa861b fix block device ... |
608 |
|
372cf243e block: convert to... |
609 |
error = file_write_and_wait_range(filp, start, end); |
da5aa861b fix block device ... |
610 611 |
if (error) return error; |
ab0a9735e blkdev: flush dis... |
612 |
|
b8af67e26 fs/block_dev.c: f... |
613 614 615 616 617 |
/* * There is no need to serialise calls to blkdev_issue_flush with * i_mutex and doing so causes performance issues with concurrent * O_SYNC writers to a block device. */ |
dd3932edd block: remove BLK... |
618 |
error = blkdev_issue_flush(bdev, GFP_KERNEL, NULL); |
ab0a9735e blkdev: flush dis... |
619 620 |
if (error == -EOPNOTSUPP) error = 0; |
b8af67e26 fs/block_dev.c: f... |
621 |
|
ab0a9735e blkdev: flush dis... |
622 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
623 |
} |
b1dd3b284 vfs: rename block... |
624 |
EXPORT_SYMBOL(blkdev_fsync); |
1da177e4c Linux-2.6.12-rc2 |
625 |
|
47a191fd3 fs/block_dev.c: a... |
626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 |
/** * bdev_read_page() - Start reading a page from a block device * @bdev: The device to read the page from * @sector: The offset on the device to read the page to (need not be aligned) * @page: The page to read * * On entry, the page should be locked. It will be unlocked when the page * has been read. If the block driver implements rw_page synchronously, * that will be true on exit from this function, but it need not be. * * Errors returned by this function are usually "soft", eg out of memory, or * queue full; callers should try a different route to read this page rather * than propagate an error back up the stack. * * Return: negative errno if an error occurs, 0 if submission was successful. */ int bdev_read_page(struct block_device *bdev, sector_t sector, struct page *page) { const struct block_device_operations *ops = bdev->bd_disk->fops; |
2e6edc953 block: protect rw... |
646 |
int result = -EOPNOTSUPP; |
f68eb1e71 fs/block_dev.c: s... |
647 |
if (!ops->rw_page || bdev_get_integrity(bdev)) |
2e6edc953 block: protect rw... |
648 |
return result; |
6f3b0e8bc blk-mq: add a fla... |
649 |
result = blk_queue_enter(bdev->bd_queue, false); |
2e6edc953 block: protect rw... |
650 651 |
if (result) return result; |
c11f0c0b5 block/mm: make bd... |
652 |
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, false); |
2e6edc953 block: protect rw... |
653 654 |
blk_queue_exit(bdev->bd_queue); return result; |
47a191fd3 fs/block_dev.c: a... |
655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 |
} EXPORT_SYMBOL_GPL(bdev_read_page); /** * bdev_write_page() - Start writing a page to a block device * @bdev: The device to write the page to * @sector: The offset on the device to write the page to (need not be aligned) * @page: The page to write * @wbc: The writeback_control for the write * * On entry, the page should be locked and not currently under writeback. * On exit, if the write started successfully, the page will be unlocked and * under writeback. If the write failed already (eg the driver failed to * queue the page to the device), the page will still be locked. If the * caller is a ->writepage implementation, it will need to unlock the page. * * Errors returned by this function are usually "soft", eg out of memory, or * queue full; callers should try a different route to write this page rather * than propagate an error back up the stack. * * Return: negative errno if an error occurs, 0 if submission was successful. */ int bdev_write_page(struct block_device *bdev, sector_t sector, struct page *page, struct writeback_control *wbc) { int result; |
47a191fd3 fs/block_dev.c: a... |
681 |
const struct block_device_operations *ops = bdev->bd_disk->fops; |
2e6edc953 block: protect rw... |
682 |
|
f68eb1e71 fs/block_dev.c: s... |
683 |
if (!ops->rw_page || bdev_get_integrity(bdev)) |
47a191fd3 fs/block_dev.c: a... |
684 |
return -EOPNOTSUPP; |
6f3b0e8bc blk-mq: add a fla... |
685 |
result = blk_queue_enter(bdev->bd_queue, false); |
2e6edc953 block: protect rw... |
686 687 |
if (result) return result; |
47a191fd3 fs/block_dev.c: a... |
688 |
set_page_writeback(page); |
c11f0c0b5 block/mm: make bd... |
689 |
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, true); |
f892760aa fs/mpage.c: fix m... |
690 |
if (result) { |
47a191fd3 fs/block_dev.c: a... |
691 |
end_page_writeback(page); |
f892760aa fs/mpage.c: fix m... |
692 693 |
} else { clean_page_buffers(page); |
47a191fd3 fs/block_dev.c: a... |
694 |
unlock_page(page); |
f892760aa fs/mpage.c: fix m... |
695 |
} |
2e6edc953 block: protect rw... |
696 |
blk_queue_exit(bdev->bd_queue); |
47a191fd3 fs/block_dev.c: a... |
697 698 699 |
return result; } EXPORT_SYMBOL_GPL(bdev_write_page); |
1da177e4c Linux-2.6.12-rc2 |
700 701 702 703 704 |
/* * pseudo-fs */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(bdev_lock); |
e18b890bb [PATCH] slab: rem... |
705 |
static struct kmem_cache * bdev_cachep __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
706 707 708 |
static struct inode *bdev_alloc_inode(struct super_block *sb) { |
e94b17660 [PATCH] slab: rem... |
709 |
struct bdev_inode *ei = kmem_cache_alloc(bdev_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
710 711 712 713 |
if (!ei) return NULL; return &ei->vfs_inode; } |
fa0d7e3de fs: icache RCU fr... |
714 |
static void bdev_i_callback(struct rcu_head *head) |
1da177e4c Linux-2.6.12-rc2 |
715 |
{ |
fa0d7e3de fs: icache RCU fr... |
716 |
struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4c Linux-2.6.12-rc2 |
717 |
struct bdev_inode *bdi = BDEV_I(inode); |
1da177e4c Linux-2.6.12-rc2 |
718 719 |
kmem_cache_free(bdev_cachep, bdi); } |
fa0d7e3de fs: icache RCU fr... |
720 721 722 723 |
static void bdev_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, bdev_i_callback); } |
51cc50685 SL*B: drop kmem c... |
724 |
static void init_once(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
725 726 727 |
{ struct bdev_inode *ei = (struct bdev_inode *) foo; struct block_device *bdev = &ei->bdev; |
a35afb830 Remove SLAB_CTOR_... |
728 729 |
memset(bdev, 0, sizeof(*bdev)); mutex_init(&bdev->bd_mutex); |
a35afb830 Remove SLAB_CTOR_... |
730 |
INIT_LIST_HEAD(&bdev->bd_list); |
49731baa4 block: restore mu... |
731 732 733 |
#ifdef CONFIG_SYSFS INIT_LIST_HEAD(&bdev->bd_holder_disks); #endif |
a5a79d000 block: Initialize... |
734 |
bdev->bd_bdi = &noop_backing_dev_info; |
a35afb830 Remove SLAB_CTOR_... |
735 |
inode_init_once(&ei->vfs_inode); |
fcccf5025 filesystem freeze... |
736 737 |
/* Initialize mutex for freeze. */ mutex_init(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
738 |
} |
b57922d97 convert remaining... |
739 |
static void bdev_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
740 741 |
{ struct block_device *bdev = &BDEV_I(inode)->bdev; |
91b0abe36 mm + fs: store sh... |
742 |
truncate_inode_pages_final(&inode->i_data); |
b57922d97 convert remaining... |
743 |
invalidate_inode_buffers(inode); /* is it needed here? */ |
dbd5768f8 vfs: Rename end_w... |
744 |
clear_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
745 |
spin_lock(&bdev_lock); |
1da177e4c Linux-2.6.12-rc2 |
746 747 |
list_del_init(&bdev->bd_list); spin_unlock(&bdev_lock); |
f759741d9 block: Fix oops i... |
748 749 |
/* Detach inode from wb early as bdi_put() may free bdi->wb */ inode_detach_wb(inode); |
a5a79d000 block: Initialize... |
750 |
if (bdev->bd_bdi != &noop_backing_dev_info) { |
b1d2dc565 block: Make blk_g... |
751 |
bdi_put(bdev->bd_bdi); |
a5a79d000 block: Initialize... |
752 753 |
bdev->bd_bdi = &noop_backing_dev_info; } |
1da177e4c Linux-2.6.12-rc2 |
754 |
} |
ee9b6d61a [PATCH] Mark stru... |
755 |
static const struct super_operations bdev_sops = { |
1da177e4c Linux-2.6.12-rc2 |
756 757 758 759 |
.statfs = simple_statfs, .alloc_inode = bdev_alloc_inode, .destroy_inode = bdev_destroy_inode, .drop_inode = generic_delete_inode, |
b57922d97 convert remaining... |
760 |
.evict_inode = bdev_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
761 |
}; |
51139adac convert get_sb_ps... |
762 763 |
static struct dentry *bd_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
764 |
{ |
3684aa709 block-dev: enable... |
765 766 |
struct dentry *dent; dent = mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC); |
e9e5e3fae bdev: fix NULL po... |
767 |
if (!IS_ERR(dent)) |
3684aa709 block-dev: enable... |
768 769 |
dent->d_sb->s_iflags |= SB_I_CGROUPWB; return dent; |
1da177e4c Linux-2.6.12-rc2 |
770 771 772 773 |
} static struct file_system_type bd_type = { .name = "bdev", |
51139adac convert get_sb_ps... |
774 |
.mount = bd_mount, |
1da177e4c Linux-2.6.12-rc2 |
775 776 |
.kill_sb = kill_anon_super, }; |
a212b105b bdi: make inode_t... |
777 778 |
struct super_block *blockdev_superblock __read_mostly; EXPORT_SYMBOL_GPL(blockdev_superblock); |
1da177e4c Linux-2.6.12-rc2 |
779 780 781 782 |
void __init bdev_cache_init(void) { int err; |
ace8577ae block_dev: Suppre... |
783 |
static struct vfsmount *bd_mnt; |
c2acf7b90 fs/block_dev.c: _... |
784 |
|
1da177e4c Linux-2.6.12-rc2 |
785 |
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), |
fffb60f93 [PATCH] cpuset me... |
786 |
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
5d097056c kmemcg: account c... |
787 |
SLAB_MEM_SPREAD|SLAB_ACCOUNT|SLAB_PANIC), |
20c2df83d mm: Remove slab d... |
788 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
789 790 791 792 |
err = register_filesystem(&bd_type); if (err) panic("Cannot register bdev pseudo-fs"); bd_mnt = kern_mount(&bd_type); |
1da177e4c Linux-2.6.12-rc2 |
793 794 |
if (IS_ERR(bd_mnt)) panic("Cannot create bdev pseudo-fs"); |
ace8577ae block_dev: Suppre... |
795 |
blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ |
1da177e4c Linux-2.6.12-rc2 |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 |
} /* * Most likely _very_ bad one - but then it's hardly critical for small * /dev and can be fixed when somebody will need really large one. * Keep in mind that it will be fed through icache hash function too. */ static inline unsigned long hash(dev_t dev) { return MAJOR(dev)+MINOR(dev); } static int bdev_test(struct inode *inode, void *data) { return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data; } static int bdev_set(struct inode *inode, void *data) { BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data; return 0; } static LIST_HEAD(all_bdevs); |
f44f1ab5a block: Unhash blo... |
820 821 822 823 824 825 826 827 828 829 830 831 832 833 |
/* * If there is a bdev inode for this device, unhash it so that it gets evicted * as soon as last inode reference is dropped. */ void bdev_unhash_inode(dev_t dev) { struct inode *inode; inode = ilookup5(blockdev_superblock, hash(dev), bdev_test, &dev); if (inode) { remove_inode_hash(inode); iput(inode); } } |
1da177e4c Linux-2.6.12-rc2 |
834 835 836 837 |
struct block_device *bdget(dev_t dev) { struct block_device *bdev; struct inode *inode; |
c2acf7b90 fs/block_dev.c: _... |
838 |
inode = iget5_locked(blockdev_superblock, hash(dev), |
1da177e4c Linux-2.6.12-rc2 |
839 840 841 842 843 844 845 846 847 |
bdev_test, bdev_set, &dev); if (!inode) return NULL; bdev = &BDEV_I(inode)->bdev; if (inode->i_state & I_NEW) { bdev->bd_contains = NULL; |
782b94cdf block: initialise... |
848 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
849 |
bdev->bd_inode = inode; |
93407472a fs: add i_blocksi... |
850 |
bdev->bd_block_size = i_blocksize(inode); |
1da177e4c Linux-2.6.12-rc2 |
851 852 853 854 855 856 857 |
bdev->bd_part_count = 0; bdev->bd_invalidated = 0; inode->i_mode = S_IFBLK; inode->i_rdev = dev; inode->i_bdev = bdev; inode->i_data.a_ops = &def_blk_aops; mapping_set_gfp_mask(&inode->i_data, GFP_USER); |
1da177e4c Linux-2.6.12-rc2 |
858 859 860 861 862 863 864 865 866 |
spin_lock(&bdev_lock); list_add(&bdev->bd_list, &all_bdevs); spin_unlock(&bdev_lock); unlock_new_inode(inode); } return bdev; } EXPORT_SYMBOL(bdget); |
dddac6a7b PM / Hibernate: R... |
867 868 869 870 871 872 |
/** * bdgrab -- Grab a reference to an already referenced block device * @bdev: Block device to grab a reference to. */ struct block_device *bdgrab(struct block_device *bdev) { |
7de9c6ee3 new helper: ihold() |
873 |
ihold(bdev->bd_inode); |
dddac6a7b PM / Hibernate: R... |
874 875 |
return bdev; } |
c1681bf8a loop: prevent bde... |
876 |
EXPORT_SYMBOL(bdgrab); |
dddac6a7b PM / Hibernate: R... |
877 |
|
1da177e4c Linux-2.6.12-rc2 |
878 879 |
long nr_blockdev_pages(void) { |
203a2935c fs/block_dev.c: u... |
880 |
struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
881 882 |
long ret = 0; spin_lock(&bdev_lock); |
203a2935c fs/block_dev.c: u... |
883 |
list_for_each_entry(bdev, &all_bdevs, bd_list) { |
1da177e4c Linux-2.6.12-rc2 |
884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 |
ret += bdev->bd_inode->i_mapping->nrpages; } spin_unlock(&bdev_lock); return ret; } void bdput(struct block_device *bdev) { iput(bdev->bd_inode); } EXPORT_SYMBOL(bdput); static struct block_device *bd_acquire(struct inode *inode) { struct block_device *bdev; |
09d967c6f [PATCH] Fix a rac... |
900 |
|
1da177e4c Linux-2.6.12-rc2 |
901 902 |
spin_lock(&bdev_lock); bdev = inode->i_bdev; |
cccd9fb9e block: Revalidate... |
903 |
if (bdev && !inode_unhashed(bdev->bd_inode)) { |
ed8a9d2c8 block: use bd{gra... |
904 |
bdgrab(bdev); |
1da177e4c Linux-2.6.12-rc2 |
905 906 907 908 |
spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
909 |
|
cccd9fb9e block: Revalidate... |
910 911 912 913 914 915 916 917 |
/* * i_bdev references block device inode that was already shut down * (corresponding device got removed). Remove the reference and look * up block device inode again just in case new device got * reestablished under the same device number. */ if (bdev) bd_forget(inode); |
1da177e4c Linux-2.6.12-rc2 |
918 919 920 |
bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
921 922 |
if (!inode->i_bdev) { /* |
7de9c6ee3 new helper: ihold() |
923 |
* We take an additional reference to bd_inode, |
09d967c6f [PATCH] Fix a rac... |
924 925 926 927 |
* and it's released in clear_inode() of inode. * So, we can access it via ->i_mapping always * without igrab(). */ |
ed8a9d2c8 block: use bd{gra... |
928 |
bdgrab(bdev); |
09d967c6f [PATCH] Fix a rac... |
929 930 |
inode->i_bdev = bdev; inode->i_mapping = bdev->bd_inode->i_mapping; |
09d967c6f [PATCH] Fix a rac... |
931 |
} |
1da177e4c Linux-2.6.12-rc2 |
932 933 934 935 936 937 938 939 940 |
spin_unlock(&bdev_lock); } return bdev; } /* Call when you free inode */ void bd_forget(struct inode *inode) { |
09d967c6f [PATCH] Fix a rac... |
941 |
struct block_device *bdev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
942 |
spin_lock(&bdev_lock); |
b4ea2eaa1 fs/block_dev.c: n... |
943 944 |
if (!sb_is_blkdev_sb(inode->i_sb)) bdev = inode->i_bdev; |
a4a4f9439 bdev: get rid of ... |
945 946 |
inode->i_bdev = NULL; inode->i_mapping = &inode->i_data; |
1da177e4c Linux-2.6.12-rc2 |
947 |
spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
948 949 |
if (bdev) |
ed8a9d2c8 block: use bd{gra... |
950 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
951 |
} |
1a3cbbc5a block: factor out... |
952 953 954 955 956 957 |
/** * bd_may_claim - test whether a block device can be claimed * @bdev: block device of interest * @whole: whole block device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * |
25985edce Fix common misspe... |
958 |
* Test whether @bdev can be claimed by @holder. |
1a3cbbc5a block: factor out... |
959 960 961 962 963 964 965 966 967 |
* * CONTEXT: * spin_lock(&bdev_lock). * * RETURNS: * %true if @bdev can be claimed, %false otherwise. */ static bool bd_may_claim(struct block_device *bdev, struct block_device *whole, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
968 |
{ |
1da177e4c Linux-2.6.12-rc2 |
969 |
if (bdev->bd_holder == holder) |
1a3cbbc5a block: factor out... |
970 |
return true; /* already a holder */ |
1da177e4c Linux-2.6.12-rc2 |
971 |
else if (bdev->bd_holder != NULL) |
1a3cbbc5a block: factor out... |
972 |
return false; /* held by someone else */ |
bcc7f5b4b block_dev: don't ... |
973 |
else if (whole == bdev) |
1a3cbbc5a block: factor out... |
974 |
return true; /* is a whole device which isn't held */ |
1da177e4c Linux-2.6.12-rc2 |
975 |
|
e525fd89d block: make blkde... |
976 |
else if (whole->bd_holder == bd_may_claim) |
1a3cbbc5a block: factor out... |
977 978 979 |
return true; /* is a partition of a device that is being partitioned */ else if (whole->bd_holder != NULL) return false; /* is a partition of a held device */ |
1da177e4c Linux-2.6.12-rc2 |
980 |
else |
1a3cbbc5a block: factor out... |
981 982 983 984 |
return true; /* is a partition of an un-held device */ } /** |
6b4517a79 block: implement ... |
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 |
* bd_prepare_to_claim - prepare to claim a block device * @bdev: block device of interest * @whole: the whole device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * * Prepare to claim @bdev. This function fails if @bdev is already * claimed by another holder and waits if another claiming is in * progress. This function doesn't actually claim. On successful * return, the caller has ownership of bd_claiming and bd_holder[s]. * * CONTEXT: * spin_lock(&bdev_lock). Might release bdev_lock, sleep and regrab * it multiple times. * * RETURNS: * 0 if @bdev can be claimed, -EBUSY otherwise. */ static int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, void *holder) { retry: /* if someone else claimed, fail */ if (!bd_may_claim(bdev, whole, holder)) return -EBUSY; |
e75aa8589 block_dev: always... |
1009 1010 |
/* if claiming is already in progress, wait for it to finish */ if (whole->bd_claiming) { |
6b4517a79 block: implement ... |
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 |
wait_queue_head_t *wq = bit_waitqueue(&whole->bd_claiming, 0); DEFINE_WAIT(wait); prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE); spin_unlock(&bdev_lock); schedule(); finish_wait(wq, &wait); spin_lock(&bdev_lock); goto retry; } /* yay, all mine */ return 0; } /** * bd_start_claiming - start claiming a block device * @bdev: block device of interest * @holder: holder trying to claim @bdev * * @bdev is about to be opened exclusively. Check @bdev can be opened * exclusively and mark that an exclusive open is in progress. Each * successful call to this function must be matched with a call to |
b0018361c block: bd_start_c... |
1034 1035 1036 1037 1038 1039 1040 |
* either bd_finish_claiming() or bd_abort_claiming() (which do not * fail). * * This function is used to gain exclusive access to the block device * without actually causing other exclusive open attempts to fail. It * should be used when the open sequence itself requires exclusive * access but may subsequently fail. |
6b4517a79 block: implement ... |
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 |
* * CONTEXT: * Might sleep. * * RETURNS: * Pointer to the block device containing @bdev on success, ERR_PTR() * value on failure. */ static struct block_device *bd_start_claiming(struct block_device *bdev, void *holder) { struct gendisk *disk; struct block_device *whole; int partno, err; might_sleep(); /* * @bdev might not have been initialized properly yet, look up * and grab the outer block device the hard way. */ disk = get_gendisk(bdev->bd_dev, &partno); if (!disk) return ERR_PTR(-ENXIO); |
d4c208b86 block: use the pa... |
1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 |
/* * Normally, @bdev should equal what's returned from bdget_disk() * if partno is 0; however, some drivers (floppy) use multiple * bdev's for the same physical device and @bdev may be one of the * aliases. Keep @bdev if partno is 0. This means claimer * tracking is broken for those devices but it has always been that * way. */ if (partno) whole = bdget_disk(disk, 0); else whole = bdgrab(bdev); |
cf3425707 block: bd_start_c... |
1077 |
module_put(disk->fops->owner); |
6b4517a79 block: implement ... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 |
put_disk(disk); if (!whole) return ERR_PTR(-ENOMEM); /* prepare to claim, if successful, mark claiming in progress */ spin_lock(&bdev_lock); err = bd_prepare_to_claim(bdev, whole, holder); if (err == 0) { whole->bd_claiming = holder; spin_unlock(&bdev_lock); return whole; } else { spin_unlock(&bdev_lock); bdput(whole); return ERR_PTR(err); } } |
641dc636b [PATCH] dm/md dep... |
1096 |
#ifdef CONFIG_SYSFS |
49731baa4 block: restore mu... |
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 |
struct bd_holder_disk { struct list_head list; struct gendisk *disk; int refcnt; }; static struct bd_holder_disk *bd_find_holder_disk(struct block_device *bdev, struct gendisk *disk) { struct bd_holder_disk *holder; list_for_each_entry(holder, &bdev->bd_holder_disks, list) if (holder->disk == disk) return holder; return NULL; } |
4d7dd8fd9 [PATCH] blockdev.... |
1113 |
static int add_symlink(struct kobject *from, struct kobject *to) |
641dc636b [PATCH] dm/md dep... |
1114 |
{ |
4d7dd8fd9 [PATCH] blockdev.... |
1115 |
return sysfs_create_link(from, to, kobject_name(to)); |
641dc636b [PATCH] dm/md dep... |
1116 1117 1118 1119 |
} static void del_symlink(struct kobject *from, struct kobject *to) { |
641dc636b [PATCH] dm/md dep... |
1120 1121 |
sysfs_remove_link(from, kobject_name(to)); } |
641dc636b [PATCH] dm/md dep... |
1122 |
/** |
e09b457bd block: simplify h... |
1123 1124 1125 |
* bd_link_disk_holder - create symlinks between holding disk and slave bdev * @bdev: the claimed slave bdev * @disk: the holding disk |
df6c0cd9a [PATCH] clean up ... |
1126 |
* |
49731baa4 block: restore mu... |
1127 1128 |
* DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * |
e09b457bd block: simplify h... |
1129 |
* This functions creates the following sysfs symlinks. |
641dc636b [PATCH] dm/md dep... |
1130 |
* |
e09b457bd block: simplify h... |
1131 1132 |
* - from "slaves" directory of the holder @disk to the claimed @bdev * - from "holders" directory of the @bdev to the holder @disk |
641dc636b [PATCH] dm/md dep... |
1133 |
* |
e09b457bd block: simplify h... |
1134 1135 |
* For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is * passed to bd_link_disk_holder(), then: |
641dc636b [PATCH] dm/md dep... |
1136 |
* |
e09b457bd block: simplify h... |
1137 1138 |
* /sys/block/dm-0/slaves/sda --> /sys/block/sda * /sys/block/sda/holders/dm-0 --> /sys/block/dm-0 |
641dc636b [PATCH] dm/md dep... |
1139 |
* |
e09b457bd block: simplify h... |
1140 1141 1142 |
* The caller must have claimed @bdev before calling this function and * ensure that both @bdev and @disk are valid during the creation and * lifetime of these symlinks. |
641dc636b [PATCH] dm/md dep... |
1143 |
* |
e09b457bd block: simplify h... |
1144 1145 |
* CONTEXT: * Might sleep. |
641dc636b [PATCH] dm/md dep... |
1146 |
* |
e09b457bd block: simplify h... |
1147 1148 |
* RETURNS: * 0 on success, -errno on failure. |
641dc636b [PATCH] dm/md dep... |
1149 |
*/ |
e09b457bd block: simplify h... |
1150 |
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
1151 |
{ |
49731baa4 block: restore mu... |
1152 |
struct bd_holder_disk *holder; |
e09b457bd block: simplify h... |
1153 |
int ret = 0; |
641dc636b [PATCH] dm/md dep... |
1154 |
|
2e7b651df [PATCH] remove th... |
1155 |
mutex_lock(&bdev->bd_mutex); |
df6c0cd9a [PATCH] clean up ... |
1156 |
|
49731baa4 block: restore mu... |
1157 |
WARN_ON_ONCE(!bdev->bd_holder); |
4e91672c7 Replace obscure c... |
1158 |
|
e09b457bd block: simplify h... |
1159 1160 1161 |
/* FIXME: remove the following once add_disk() handles errors */ if (WARN_ON(!disk->slave_dir || !bdev->bd_part->holder_dir)) goto out_unlock; |
4e91672c7 Replace obscure c... |
1162 |
|
49731baa4 block: restore mu... |
1163 1164 1165 |
holder = bd_find_holder_disk(bdev, disk); if (holder) { holder->refcnt++; |
e09b457bd block: simplify h... |
1166 |
goto out_unlock; |
49731baa4 block: restore mu... |
1167 |
} |
641dc636b [PATCH] dm/md dep... |
1168 |
|
49731baa4 block: restore mu... |
1169 1170 1171 |
holder = kzalloc(sizeof(*holder), GFP_KERNEL); if (!holder) { ret = -ENOMEM; |
e09b457bd block: simplify h... |
1172 1173 |
goto out_unlock; } |
641dc636b [PATCH] dm/md dep... |
1174 |
|
49731baa4 block: restore mu... |
1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 |
INIT_LIST_HEAD(&holder->list); holder->disk = disk; holder->refcnt = 1; ret = add_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); if (ret) goto out_free; ret = add_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj); if (ret) goto out_del; |
e7407d161 block: bd_link_di... |
1186 1187 1188 1189 1190 |
/* * bdev could be deleted beneath us which would implicitly destroy * the holder directory. Hold on to it. */ kobject_get(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
1191 1192 1193 1194 1195 1196 1197 1198 |
list_add(&holder->list, &bdev->bd_holder_disks); goto out_unlock; out_del: del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); out_free: kfree(holder); |
e09b457bd block: simplify h... |
1199 |
out_unlock: |
b4cf1b72e [PATCH] dm/md dep... |
1200 |
mutex_unlock(&bdev->bd_mutex); |
e09b457bd block: simplify h... |
1201 |
return ret; |
641dc636b [PATCH] dm/md dep... |
1202 |
} |
e09b457bd block: simplify h... |
1203 |
EXPORT_SYMBOL_GPL(bd_link_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1204 |
|
49731baa4 block: restore mu... |
1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 |
/** * bd_unlink_disk_holder - destroy symlinks created by bd_link_disk_holder() * @bdev: the calimed slave bdev * @disk: the holding disk * * DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * * CONTEXT: * Might sleep. */ void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
1216 |
{ |
49731baa4 block: restore mu... |
1217 |
struct bd_holder_disk *holder; |
641dc636b [PATCH] dm/md dep... |
1218 |
|
49731baa4 block: restore mu... |
1219 |
mutex_lock(&bdev->bd_mutex); |
641dc636b [PATCH] dm/md dep... |
1220 |
|
49731baa4 block: restore mu... |
1221 1222 1223 1224 1225 1226 |
holder = bd_find_holder_disk(bdev, disk); if (!WARN_ON_ONCE(holder == NULL) && !--holder->refcnt) { del_symlink(disk->slave_dir, &part_to_dev(bdev->bd_part)->kobj); del_symlink(bdev->bd_part->holder_dir, &disk_to_dev(disk)->kobj); |
e7407d161 block: bd_link_di... |
1227 |
kobject_put(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
1228 1229 1230 1231 1232 |
list_del_init(&holder->list); kfree(holder); } mutex_unlock(&bdev->bd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1233 |
} |
49731baa4 block: restore mu... |
1234 |
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1235 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1236 |
|
0c002c2f7 Wrapper for lower... |
1237 |
/** |
56ade44b4 Added flush_disk ... |
1238 1239 1240 |
* flush_disk - invalidates all buffer-cache entries on a disk * * @bdev: struct block device to be flushed |
e6eb5ce1b fs/block_dev.c: f... |
1241 |
* @kill_dirty: flag to guide handling of dirty inodes |
56ade44b4 Added flush_disk ... |
1242 1243 1244 1245 1246 |
* * Invalidates all buffer-cache entries on a disk. It should be called * when a disk has been changed -- either by a media change or online * resize. */ |
93b270f76 Fix over-zealous ... |
1247 |
static void flush_disk(struct block_device *bdev, bool kill_dirty) |
56ade44b4 Added flush_disk ... |
1248 |
{ |
93b270f76 Fix over-zealous ... |
1249 |
if (__invalidate_device(bdev, kill_dirty)) { |
56ade44b4 Added flush_disk ... |
1250 |
printk(KERN_WARNING "VFS: busy inodes on changed media or " |
424081f3c fs: use gendisk->... |
1251 1252 1253 |
"resized disk %s ", bdev->bd_disk ? bdev->bd_disk->disk_name : ""); |
56ade44b4 Added flush_disk ... |
1254 1255 1256 1257 |
} if (!bdev->bd_disk) return; |
d27769ec3 block: add GENHD_... |
1258 |
if (disk_part_scan_enabled(bdev->bd_disk)) |
56ade44b4 Added flush_disk ... |
1259 1260 1261 1262 |
bdev->bd_invalidated = 1; } /** |
57d1b5366 block_dev: fix ke... |
1263 |
* check_disk_size_change - checks for disk size change and adjusts bdev size. |
c3279d145 Adjust block devi... |
1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 |
* @disk: struct gendisk to check * @bdev: struct bdev to adjust. * * This routine checks to see if the bdev size does not match the disk size * and adjusts it if it differs. */ void check_disk_size_change(struct gendisk *disk, struct block_device *bdev) { loff_t disk_size, bdev_size; disk_size = (loff_t)get_capacity(disk) << 9; bdev_size = i_size_read(bdev->bd_inode); if (disk_size != bdev_size) { |
c3279d145 Adjust block devi... |
1277 1278 1279 |
printk(KERN_INFO "%s: detected capacity change from %lld to %lld ", |
424081f3c fs: use gendisk->... |
1280 |
disk->disk_name, bdev_size, disk_size); |
c3279d145 Adjust block devi... |
1281 |
i_size_write(bdev->bd_inode, disk_size); |
93b270f76 Fix over-zealous ... |
1282 |
flush_disk(bdev, false); |
c3279d145 Adjust block devi... |
1283 1284 1285 1286 1287 |
} } EXPORT_SYMBOL(check_disk_size_change); /** |
57d1b5366 block_dev: fix ke... |
1288 |
* revalidate_disk - wrapper for lower-level driver's revalidate_disk call-back |
0c002c2f7 Wrapper for lower... |
1289 1290 1291 1292 1293 1294 1295 1296 |
* @disk: struct gendisk to be revalidated * * This routine is a wrapper for lower-level driver's revalidate_disk * call-backs. It is used to do common pre and post operations needed * for all revalidate_disk operations. */ int revalidate_disk(struct gendisk *disk) { |
c3279d145 Adjust block devi... |
1297 |
struct block_device *bdev; |
0c002c2f7 Wrapper for lower... |
1298 1299 1300 1301 |
int ret = 0; if (disk->fops->revalidate_disk) ret = disk->fops->revalidate_disk(disk); |
c3279d145 Adjust block devi... |
1302 1303 1304 1305 1306 1307 |
bdev = bdget_disk(disk, 0); if (!bdev) return ret; mutex_lock(&bdev->bd_mutex); check_disk_size_change(disk, bdev); |
7630b661d fs/block_dev.c: p... |
1308 |
bdev->bd_invalidated = 0; |
c3279d145 Adjust block devi... |
1309 1310 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
0c002c2f7 Wrapper for lower... |
1311 1312 1313 |
return ret; } EXPORT_SYMBOL(revalidate_disk); |
1da177e4c Linux-2.6.12-rc2 |
1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 |
/* * This routine checks whether a removable media has been changed, * and invalidates all buffer-cache-entries in that case. This * is a relatively slow routine, so we have to try to minimize using * it. Thus it is called only upon a 'mount' or 'open'. This * is the best way of combining speed and utility, I think. * People changing diskettes in the middle of an operation deserve * to lose :-) */ int check_disk_change(struct block_device *bdev) { struct gendisk *disk = bdev->bd_disk; |
83d5cde47 const: make block... |
1326 |
const struct block_device_operations *bdops = disk->fops; |
77ea887e4 implement in-kern... |
1327 |
unsigned int events; |
1da177e4c Linux-2.6.12-rc2 |
1328 |
|
77ea887e4 implement in-kern... |
1329 1330 1331 |
events = disk_clear_events(disk, DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST); if (!(events & DISK_EVENT_MEDIA_CHANGE)) |
1da177e4c Linux-2.6.12-rc2 |
1332 |
return 0; |
93b270f76 Fix over-zealous ... |
1333 |
flush_disk(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1334 1335 |
if (bdops->revalidate_disk) bdops->revalidate_disk(bdev->bd_disk); |
1da177e4c Linux-2.6.12-rc2 |
1336 1337 1338 1339 1340 1341 1342 |
return 1; } EXPORT_SYMBOL(check_disk_change); void bd_set_size(struct block_device *bdev, loff_t size) { |
e1defc4ff block: Do away wi... |
1343 |
unsigned bsize = bdev_logical_block_size(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1344 |
|
5955102c9 wrappers for ->i_... |
1345 |
inode_lock(bdev->bd_inode); |
d646a02a9 block: use i_size... |
1346 |
i_size_write(bdev->bd_inode, size); |
5955102c9 wrappers for ->i_... |
1347 |
inode_unlock(bdev->bd_inode); |
09cbfeaf1 mm, fs: get rid o... |
1348 |
while (bsize < PAGE_SIZE) { |
1da177e4c Linux-2.6.12-rc2 |
1349 1350 1351 1352 1353 1354 1355 1356 |
if (size & bsize) break; bsize <<= 1; } bdev->bd_block_size = bsize; bdev->bd_inode->i_blkbits = blksize_bits(bsize); } EXPORT_SYMBOL(bd_set_size); |
4385bab12 make blkdev_put()... |
1357 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); |
37be41241 [PATCH] lockdep: ... |
1358 |
|
6d740cd5b [PATCH] lockdep: ... |
1359 1360 1361 1362 1363 1364 |
/* * bd_mutex locking: * * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ |
572c48921 [PATCH] sanitize ... |
1365 |
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) |
1da177e4c Linux-2.6.12-rc2 |
1366 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1367 |
struct gendisk *disk; |
523e1d399 block: make gendi... |
1368 |
struct module *owner; |
7db9cfd38 devscgroup: check... |
1369 |
int ret; |
cf771cb5a block: make varia... |
1370 |
int partno; |
fe6e9c1f2 [PATCH] fix cgrou... |
1371 |
int perm = 0; |
572c48921 [PATCH] sanitize ... |
1372 |
if (mode & FMODE_READ) |
fe6e9c1f2 [PATCH] fix cgrou... |
1373 |
perm |= MAY_READ; |
572c48921 [PATCH] sanitize ... |
1374 |
if (mode & FMODE_WRITE) |
fe6e9c1f2 [PATCH] fix cgrou... |
1375 1376 1377 1378 |
perm |= MAY_WRITE; /* * hooks: /n/, see "layering violations". */ |
b7300b78d blkdev: cgroup wh... |
1379 1380 1381 1382 1383 1384 |
if (!for_part) { ret = devcgroup_inode_permission(bdev->bd_inode, perm); if (ret != 0) { bdput(bdev); return ret; } |
826660203 [PATCH] fix bdev ... |
1385 |
} |
7db9cfd38 devscgroup: check... |
1386 |
|
d3374825c md: make devices ... |
1387 |
restart: |
0762b8bde block: always set... |
1388 |
|
89f97496e block: fix __blkd... |
1389 |
ret = -ENXIO; |
cf771cb5a block: make varia... |
1390 |
disk = get_gendisk(bdev->bd_dev, &partno); |
0762b8bde block: always set... |
1391 |
if (!disk) |
6e9624b8c block: push down ... |
1392 |
goto out; |
523e1d399 block: make gendi... |
1393 |
owner = disk->fops->owner; |
1da177e4c Linux-2.6.12-rc2 |
1394 |
|
69e02c59a block: Don't chec... |
1395 |
disk_block_events(disk); |
6796bf54a [PATCH] lockdep: ... |
1396 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
1da177e4c Linux-2.6.12-rc2 |
1397 1398 |
if (!bdev->bd_openers) { bdev->bd_disk = disk; |
87192a2a4 vfs: cache reques... |
1399 |
bdev->bd_queue = disk->queue; |
1da177e4c Linux-2.6.12-rc2 |
1400 |
bdev->bd_contains = bdev; |
c2ee070fb block: cache the ... |
1401 |
bdev->bd_partno = partno; |
03cdadb04 block: disable bl... |
1402 |
|
cf771cb5a block: make varia... |
1403 |
if (!partno) { |
89f97496e block: fix __blkd... |
1404 1405 1406 1407 |
ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) goto out_clear; |
1196f8b81 block: rescan par... |
1408 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1409 |
if (disk->fops->open) { |
572c48921 [PATCH] sanitize ... |
1410 |
ret = disk->fops->open(bdev, mode); |
d3374825c md: make devices ... |
1411 1412 1413 1414 1415 1416 1417 |
if (ret == -ERESTARTSYS) { /* Lost a race with 'disk' being * deleted, try again. * See md.c */ disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
d3374825c md: make devices ... |
1418 |
bdev->bd_disk = NULL; |
87192a2a4 vfs: cache reques... |
1419 |
bdev->bd_queue = NULL; |
d3374825c md: make devices ... |
1420 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1421 |
disk_unblock_events(disk); |
69e02c59a block: Don't chec... |
1422 |
put_disk(disk); |
523e1d399 block: make gendi... |
1423 |
module_put(owner); |
d3374825c md: make devices ... |
1424 1425 |
goto restart; } |
1da177e4c Linux-2.6.12-rc2 |
1426 |
} |
7e69723fe block: move bd_se... |
1427 |
|
223757016 block_dev: remove... |
1428 |
if (!ret) |
7e69723fe block: move bd_se... |
1429 |
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9); |
7e69723fe block: move bd_se... |
1430 |
|
1196f8b81 block: rescan par... |
1431 1432 1433 1434 1435 1436 |
/* * If the device is invalidated, rescan partition * if open succeeded or failed with -ENOMEDIUM. * The latter is necessary to prevent ghost * partitions on a removed medium. */ |
fe316bf2d block: Fix NULL p... |
1437 1438 1439 1440 1441 1442 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(disk, bdev); } |
5a023cdba block: enable dax... |
1443 |
|
1196f8b81 block: rescan par... |
1444 1445 |
if (ret) goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1446 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1447 1448 1449 1450 |
struct block_device *whole; whole = bdget_disk(disk, 0); ret = -ENOMEM; if (!whole) |
0762b8bde block: always set... |
1451 |
goto out_clear; |
37be41241 [PATCH] lockdep: ... |
1452 |
BUG_ON(for_part); |
572c48921 [PATCH] sanitize ... |
1453 |
ret = __blkdev_get(whole, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1454 |
if (ret) |
0762b8bde block: always set... |
1455 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1456 |
bdev->bd_contains = whole; |
89f97496e block: fix __blkd... |
1457 |
bdev->bd_part = disk_get_part(disk, partno); |
e71bf0d0e block: fix disk->... |
1458 |
if (!(disk->flags & GENHD_FL_UP) || |
89f97496e block: fix __blkd... |
1459 |
!bdev->bd_part || !bdev->bd_part->nr_sects) { |
1da177e4c Linux-2.6.12-rc2 |
1460 |
ret = -ENXIO; |
0762b8bde block: always set... |
1461 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1462 |
} |
89f97496e block: fix __blkd... |
1463 |
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9); |
1da177e4c Linux-2.6.12-rc2 |
1464 |
} |
03e262798 block: Fix bdi as... |
1465 1466 1467 |
if (bdev->bd_bdi == &noop_backing_dev_info) bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
1468 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1469 |
if (bdev->bd_contains == bdev) { |
1196f8b81 block: rescan par... |
1470 1471 |
ret = 0; if (bdev->bd_disk->fops->open) |
572c48921 [PATCH] sanitize ... |
1472 |
ret = bdev->bd_disk->fops->open(bdev, mode); |
1196f8b81 block: rescan par... |
1473 |
/* the same as first opener case, read comment there */ |
fe316bf2d block: Fix NULL p... |
1474 1475 1476 1477 1478 1479 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(bdev->bd_disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(bdev->bd_disk, bdev); } |
1196f8b81 block: rescan par... |
1480 1481 |
if (ret) goto out_unlock_bdev; |
1da177e4c Linux-2.6.12-rc2 |
1482 |
} |
69e02c59a block: Don't chec... |
1483 |
/* only one opener holds refs to the module and disk */ |
69e02c59a block: Don't chec... |
1484 |
put_disk(disk); |
523e1d399 block: make gendi... |
1485 |
module_put(owner); |
1da177e4c Linux-2.6.12-rc2 |
1486 1487 |
} bdev->bd_openers++; |
37be41241 [PATCH] lockdep: ... |
1488 1489 |
if (for_part) bdev->bd_part_count++; |
c039e3134 [PATCH] sem2mutex... |
1490 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1491 |
disk_unblock_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
1492 |
return 0; |
0762b8bde block: always set... |
1493 |
out_clear: |
89f97496e block: fix __blkd... |
1494 |
disk_put_part(bdev->bd_part); |
1da177e4c Linux-2.6.12-rc2 |
1495 |
bdev->bd_disk = NULL; |
0762b8bde block: always set... |
1496 |
bdev->bd_part = NULL; |
87192a2a4 vfs: cache reques... |
1497 |
bdev->bd_queue = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1498 |
if (bdev != bdev->bd_contains) |
572c48921 [PATCH] sanitize ... |
1499 |
__blkdev_put(bdev->bd_contains, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1500 |
bdev->bd_contains = NULL; |
0762b8bde block: always set... |
1501 |
out_unlock_bdev: |
c039e3134 [PATCH] sem2mutex... |
1502 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1503 |
disk_unblock_events(disk); |
0762b8bde block: always set... |
1504 |
put_disk(disk); |
523e1d399 block: make gendi... |
1505 |
module_put(owner); |
4345caba3 block: NULL deref... |
1506 |
out: |
0762b8bde block: always set... |
1507 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1508 1509 |
return ret; } |
d4d776299 block: clean up b... |
1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 |
/** * blkdev_get - open a block device * @bdev: block_device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open @bdev with @mode. If @mode includes %FMODE_EXCL, @bdev is * open with exclusive access. Specifying %FMODE_EXCL with %NULL * @holder is invalid. Exclusive opens may nest for the same @holder. * * On success, the reference count of @bdev is unchanged. On failure, * @bdev is put. * * CONTEXT: * Might sleep. * * RETURNS: * 0 on success, -errno on failure. */ |
e525fd89d block: make blkde... |
1529 |
int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
1530 |
{ |
e525fd89d block: make blkde... |
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 |
struct block_device *whole = NULL; int res; WARN_ON_ONCE((mode & FMODE_EXCL) && !holder); if ((mode & FMODE_EXCL) && holder) { whole = bd_start_claiming(bdev, holder); if (IS_ERR(whole)) { bdput(bdev); return PTR_ERR(whole); } } res = __blkdev_get(bdev, mode, 0); if (whole) { |
d4dc210f6 block: don't bloc... |
1547 |
struct gendisk *disk = whole->bd_disk; |
6a027eff6 block: reorganize... |
1548 |
/* finish claiming */ |
77ea887e4 implement in-kern... |
1549 |
mutex_lock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1550 |
spin_lock(&bdev_lock); |
77ea887e4 implement in-kern... |
1551 |
if (!res) { |
6a027eff6 block: reorganize... |
1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 |
BUG_ON(!bd_may_claim(bdev, whole, holder)); /* * Note that for a whole device bd_holders * will be incremented twice, and bd_holder * will be set to bd_may_claim before being * set to holder */ whole->bd_holders++; whole->bd_holder = bd_may_claim; bdev->bd_holders++; bdev->bd_holder = holder; } /* tell others that we're done */ BUG_ON(whole->bd_claiming != holder); whole->bd_claiming = NULL; wake_up_bit(&whole->bd_claiming, 0); spin_unlock(&bdev_lock); |
77ea887e4 implement in-kern... |
1571 1572 |
/* |
d4dc210f6 block: don't bloc... |
1573 1574 1575 1576 1577 |
* Block event polling for write claims if requested. Any * write holder makes the write_holder state stick until * all are released. This is good enough and tracking * individual writeable reference is too fragile given the * way @mode is used in blkdev_get/put(). |
77ea887e4 implement in-kern... |
1578 |
*/ |
4c49ff3fe block: blkdev_get... |
1579 1580 |
if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder && (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { |
77ea887e4 implement in-kern... |
1581 |
bdev->bd_write_holder = true; |
d4dc210f6 block: don't bloc... |
1582 |
disk_block_events(disk); |
77ea887e4 implement in-kern... |
1583 1584 1585 |
} mutex_unlock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1586 |
bdput(whole); |
e525fd89d block: make blkde... |
1587 1588 1589 |
} return res; |
37be41241 [PATCH] lockdep: ... |
1590 |
} |
1da177e4c Linux-2.6.12-rc2 |
1591 |
EXPORT_SYMBOL(blkdev_get); |
d4d776299 block: clean up b... |
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 |
/** * blkdev_get_by_path - open a block device by name * @path: path to the block device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open the blockdevice described by the device file at @path. @mode * and @holder are identical to blkdev_get(). * * On success, the returned block_device has reference count of one. * * CONTEXT: * Might sleep. * * RETURNS: * Pointer to block_device on success, ERR_PTR(-errno) on failure. */ struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, void *holder) { struct block_device *bdev; int err; bdev = lookup_bdev(path); if (IS_ERR(bdev)) return bdev; err = blkdev_get(bdev, mode, holder); if (err) return ERR_PTR(err); |
e51900f7d block: revert blo... |
1622 1623 1624 1625 |
if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } |
d4d776299 block: clean up b... |
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 |
return bdev; } EXPORT_SYMBOL(blkdev_get_by_path); /** * blkdev_get_by_dev - open a block device by device number * @dev: device number of block device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open the blockdevice described by device number @dev. @mode and * @holder are identical to blkdev_get(). * * Use it ONLY if you really do not have anything better - i.e. when * you are behind a truly sucky interface and all you are given is a * device number. _Never_ to be used for internal purposes. If you * ever need it - reconsider your API. * * On success, the returned block_device has reference count of one. * * CONTEXT: * Might sleep. * * RETURNS: * Pointer to 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 *bdev; int err; bdev = bdget(dev); if (!bdev) return ERR_PTR(-ENOMEM); err = blkdev_get(bdev, mode, holder); if (err) return ERR_PTR(err); return bdev; } EXPORT_SYMBOL(blkdev_get_by_dev); |
1da177e4c Linux-2.6.12-rc2 |
1668 1669 1670 |
static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
1671 1672 1673 1674 1675 1676 1677 1678 |
/* * Preserve backwards compatibility and allow large file access * even if userspace doesn't ask for it explicitly. Some mkfs * binary needs it. We might want to drop this workaround * during an unstable branch. */ filp->f_flags |= O_LARGEFILE; |
c35fc7a5a block_dev: suppor... |
1679 |
filp->f_mode |= FMODE_NOWAIT; |
572c48921 [PATCH] sanitize ... |
1680 1681 1682 1683 1684 1685 |
if (filp->f_flags & O_NDELAY) filp->f_mode |= FMODE_NDELAY; if (filp->f_flags & O_EXCL) filp->f_mode |= FMODE_EXCL; if ((filp->f_flags & O_ACCMODE) == 3) filp->f_mode |= FMODE_WRITE_IOCTL; |
1da177e4c Linux-2.6.12-rc2 |
1686 |
bdev = bd_acquire(inode); |
6a2aae06c [PATCH] Fix poten... |
1687 1688 |
if (bdev == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1689 |
|
572c48921 [PATCH] sanitize ... |
1690 |
filp->f_mapping = bdev->bd_inode->i_mapping; |
5660e13d2 fs: new infrastru... |
1691 |
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping); |
572c48921 [PATCH] sanitize ... |
1692 |
|
e525fd89d block: make blkde... |
1693 |
return blkdev_get(bdev, filp->f_mode, filp); |
1da177e4c Linux-2.6.12-rc2 |
1694 |
} |
4385bab12 make blkdev_put()... |
1695 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) |
2e7b651df [PATCH] remove th... |
1696 |
{ |
2e7b651df [PATCH] remove th... |
1697 |
struct gendisk *disk = bdev->bd_disk; |
37be41241 [PATCH] lockdep: ... |
1698 |
struct block_device *victim = NULL; |
2e7b651df [PATCH] remove th... |
1699 |
|
6796bf54a [PATCH] lockdep: ... |
1700 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
37be41241 [PATCH] lockdep: ... |
1701 1702 |
if (for_part) bdev->bd_part_count--; |
2e7b651df [PATCH] remove th... |
1703 |
if (!--bdev->bd_openers) { |
6a027eff6 block: reorganize... |
1704 |
WARN_ON_ONCE(bdev->bd_holders); |
2e7b651df [PATCH] remove th... |
1705 1706 |
sync_blockdev(bdev); kill_bdev(bdev); |
43d1c0eb7 block: detach bde... |
1707 1708 |
bdev_write_inode(bdev); |
2e7b651df [PATCH] remove th... |
1709 1710 1711 |
} if (bdev->bd_contains == bdev) { if (disk->fops->release) |
db2a144be block_device_oper... |
1712 |
disk->fops->release(disk, mode); |
2e7b651df [PATCH] remove th... |
1713 1714 1715 |
} if (!bdev->bd_openers) { struct module *owner = disk->fops->owner; |
0762b8bde block: always set... |
1716 1717 |
disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
2e7b651df [PATCH] remove th... |
1718 |
bdev->bd_disk = NULL; |
37be41241 [PATCH] lockdep: ... |
1719 1720 |
if (bdev != bdev->bd_contains) victim = bdev->bd_contains; |
2e7b651df [PATCH] remove th... |
1721 |
bdev->bd_contains = NULL; |
523e1d399 block: make gendi... |
1722 1723 1724 |
put_disk(disk); module_put(owner); |
2e7b651df [PATCH] remove th... |
1725 |
} |
2e7b651df [PATCH] remove th... |
1726 1727 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
37be41241 [PATCH] lockdep: ... |
1728 |
if (victim) |
9a1c35427 [PATCH] pass fmod... |
1729 |
__blkdev_put(victim, mode, 1); |
2e7b651df [PATCH] remove th... |
1730 |
} |
4385bab12 make blkdev_put()... |
1731 |
void blkdev_put(struct block_device *bdev, fmode_t mode) |
37be41241 [PATCH] lockdep: ... |
1732 |
{ |
85ef06d1d block: flush MEDI... |
1733 |
mutex_lock(&bdev->bd_mutex); |
e525fd89d block: make blkde... |
1734 |
if (mode & FMODE_EXCL) { |
6a027eff6 block: reorganize... |
1735 1736 1737 1738 1739 1740 1741 |
bool bdev_free; /* * Release a claim on the device. The holder fields * are protected with bdev_lock. bd_mutex is to * synchronize disk_holder unlinking. */ |
6a027eff6 block: reorganize... |
1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 |
spin_lock(&bdev_lock); WARN_ON_ONCE(--bdev->bd_holders < 0); WARN_ON_ONCE(--bdev->bd_contains->bd_holders < 0); /* bd_contains might point to self, check in a separate step */ if ((bdev_free = !bdev->bd_holders)) bdev->bd_holder = NULL; if (!bdev->bd_contains->bd_holders) bdev->bd_contains->bd_holder = NULL; spin_unlock(&bdev_lock); |
77ea887e4 implement in-kern... |
1754 1755 1756 1757 |
/* * If this was the last claim, remove holder link and * unblock evpoll if it was a write holder. */ |
85ef06d1d block: flush MEDI... |
1758 1759 1760 |
if (bdev_free && bdev->bd_write_holder) { disk_unblock_events(bdev->bd_disk); bdev->bd_write_holder = false; |
77ea887e4 implement in-kern... |
1761 |
} |
6936217cc block: Don't chec... |
1762 |
} |
77ea887e4 implement in-kern... |
1763 |
|
85ef06d1d block: flush MEDI... |
1764 1765 1766 1767 1768 1769 1770 1771 |
/* * Trigger event checking and tell drivers to flush MEDIA_CHANGE * event. This is to ensure detection of media removal commanded * from userland - e.g. eject(1). */ disk_flush_events(bdev->bd_disk, DISK_EVENT_MEDIA_CHANGE); mutex_unlock(&bdev->bd_mutex); |
4385bab12 make blkdev_put()... |
1772 |
__blkdev_put(bdev, mode, 0); |
37be41241 [PATCH] lockdep: ... |
1773 |
} |
2e7b651df [PATCH] remove th... |
1774 |
EXPORT_SYMBOL(blkdev_put); |
1da177e4c Linux-2.6.12-rc2 |
1775 1776 |
static int blkdev_close(struct inode * inode, struct file * filp) { |
4ebb16ca9 block: introduce ... |
1777 |
struct block_device *bdev = I_BDEV(bdev_file_inode(filp)); |
4385bab12 make blkdev_put()... |
1778 1779 |
blkdev_put(bdev, filp->f_mode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1780 |
} |
bb93e3a52 [PATCH] block: ad... |
1781 |
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1782 |
{ |
4ebb16ca9 block: introduce ... |
1783 |
struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
56b26add0 [PATCH] kill the ... |
1784 |
fmode_t mode = file->f_mode; |
fd4ce1acd [PATCH 1/2] kill ... |
1785 1786 1787 1788 1789 |
/* * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have * to updated it before every ioctl. */ |
56b26add0 [PATCH] kill the ... |
1790 |
if (file->f_flags & O_NDELAY) |
fd4ce1acd [PATCH 1/2] kill ... |
1791 1792 1793 |
mode |= FMODE_NDELAY; else mode &= ~FMODE_NDELAY; |
56b26add0 [PATCH] kill the ... |
1794 |
return blkdev_ioctl(bdev, mode, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1795 |
} |
87d8fe1ee add releasepage h... |
1796 |
/* |
eef993806 vfs: Rename gener... |
1797 1798 1799 1800 1801 1802 |
* Write data to the block device. Only intended for the block device itself * and the raw driver which basically is a fake block device. * * Does not take i_mutex for the write and thus is not for general purpose * use. */ |
1456c0a87 blkdev_aio_write(... |
1803 |
ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) |
eef993806 vfs: Rename gener... |
1804 1805 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1806 |
struct inode *bd_inode = bdev_file_inode(file); |
7ec7b94a3 blkdev_write_iter... |
1807 |
loff_t size = i_size_read(bd_inode); |
53362a05a fs/block-dev.c:fi... |
1808 |
struct blk_plug plug; |
eef993806 vfs: Rename gener... |
1809 |
ssize_t ret; |
5f380c7fa lift generic_writ... |
1810 |
|
7ec7b94a3 blkdev_write_iter... |
1811 1812 |
if (bdev_read_only(I_BDEV(bd_inode))) return -EPERM; |
5f380c7fa lift generic_writ... |
1813 |
|
7ec7b94a3 blkdev_write_iter... |
1814 |
if (!iov_iter_count(from)) |
5f380c7fa lift generic_writ... |
1815 |
return 0; |
7ec7b94a3 blkdev_write_iter... |
1816 1817 |
if (iocb->ki_pos >= size) return -ENOSPC; |
c35fc7a5a block_dev: suppor... |
1818 1819 |
if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT) return -EOPNOTSUPP; |
7ec7b94a3 blkdev_write_iter... |
1820 |
iov_iter_truncate(from, size - iocb->ki_pos); |
eef993806 vfs: Rename gener... |
1821 |
|
53362a05a fs/block-dev.c:fi... |
1822 |
blk_start_plug(&plug); |
1456c0a87 blkdev_aio_write(... |
1823 |
ret = __generic_file_write_iter(iocb, from); |
e25922176 fs: simplify the ... |
1824 1825 |
if (ret > 0) ret = generic_write_sync(iocb, ret); |
53362a05a fs/block-dev.c:fi... |
1826 |
blk_finish_plug(&plug); |
eef993806 vfs: Rename gener... |
1827 1828 |
return ret; } |
1456c0a87 blkdev_aio_write(... |
1829 |
EXPORT_SYMBOL_GPL(blkdev_write_iter); |
eef993806 vfs: Rename gener... |
1830 |
|
b2de525f0 Return short read... |
1831 |
ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
684c9aaeb vfs: fix O_DIRECT... |
1832 1833 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1834 |
struct inode *bd_inode = bdev_file_inode(file); |
684c9aaeb vfs: fix O_DIRECT... |
1835 |
loff_t size = i_size_read(bd_inode); |
a886038ba fs/block_dev.c: s... |
1836 |
loff_t pos = iocb->ki_pos; |
684c9aaeb vfs: fix O_DIRECT... |
1837 1838 1839 1840 1841 |
if (pos >= size) return 0; size -= pos; |
a886038ba fs/block_dev.c: s... |
1842 1843 |
iov_iter_truncate(to, size); return generic_file_read_iter(iocb, to); |
684c9aaeb vfs: fix O_DIRECT... |
1844 |
} |
b2de525f0 Return short read... |
1845 |
EXPORT_SYMBOL_GPL(blkdev_read_iter); |
684c9aaeb vfs: fix O_DIRECT... |
1846 |
|
eef993806 vfs: Rename gener... |
1847 |
/* |
87d8fe1ee add releasepage h... |
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 |
* Try to release a page associated with block device when the system * is under memory pressure. */ static int blkdev_releasepage(struct page *page, gfp_t wait) { struct super_block *super = BDEV_I(page->mapping->host)->bdev.bd_super; if (super && super->s_op->bdev_try_to_free_page) return super->s_op->bdev_try_to_free_page(super, page, wait); return try_to_free_buffers(page); } |
7f6d5b529 dax: move writeba... |
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 |
static int blkdev_writepages(struct address_space *mapping, struct writeback_control *wbc) { if (dax_mapping(mapping)) { struct block_device *bdev = I_BDEV(mapping->host); return dax_writeback_mapping_range(mapping, bdev, wbc); } return generic_writepages(mapping, wbc); } |
4c54ac62d make struct def_b... |
1870 |
static const struct address_space_operations def_blk_aops = { |
1da177e4c Linux-2.6.12-rc2 |
1871 |
.readpage = blkdev_readpage, |
447f05bb4 block_dev: implem... |
1872 |
.readpages = blkdev_readpages, |
1da177e4c Linux-2.6.12-rc2 |
1873 |
.writepage = blkdev_writepage, |
6272b5a58 block_dev: conver... |
1874 1875 |
.write_begin = blkdev_write_begin, .write_end = blkdev_write_end, |
7f6d5b529 dax: move writeba... |
1876 |
.writepages = blkdev_writepages, |
87d8fe1ee add releasepage h... |
1877 |
.releasepage = blkdev_releasepage, |
1da177e4c Linux-2.6.12-rc2 |
1878 |
.direct_IO = blkdev_direct_IO, |
b45972265 mm: vmscan: take ... |
1879 |
.is_dirty_writeback = buffer_check_dirty_writeback, |
1da177e4c Linux-2.6.12-rc2 |
1880 |
}; |
25f4c4141 block: implement ... |
1881 1882 1883 1884 1885 1886 1887 1888 |
#define BLKDEV_FALLOC_FL_SUPPORTED \ (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE) static long blkdev_fallocate(struct file *file, int mode, loff_t start, loff_t len) { struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
25f4c4141 block: implement ... |
1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 |
struct address_space *mapping; loff_t end = start + len - 1; loff_t isize; int error; /* Fail if we don't recognize the flags. */ if (mode & ~BLKDEV_FALLOC_FL_SUPPORTED) return -EOPNOTSUPP; /* Don't go off the end of the device. */ isize = i_size_read(bdev->bd_inode); if (start >= isize) return -EINVAL; if (end >= isize) { if (mode & FALLOC_FL_KEEP_SIZE) { len = isize - start; end = start + len - 1; } else return -EINVAL; } /* * Don't allow IO that isn't aligned to logical block size. */ if ((start | len) & (bdev_logical_block_size(bdev) - 1)) return -EINVAL; /* Invalidate the page cache, including dirty pages. */ mapping = bdev->bd_inode->i_mapping; truncate_inode_pages_range(mapping, start, end); switch (mode) { case FALLOC_FL_ZERO_RANGE: case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE: error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, |
ee472d835 block: add a flag... |
1924 |
GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
25f4c4141 block: implement ... |
1925 1926 |
break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE: |
34045129b block_dev: use bl... |
1927 1928 |
error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK); |
25f4c4141 block: implement ... |
1929 1930 |
break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE: |
25f4c4141 block: implement ... |
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 |
error = blkdev_issue_discard(bdev, start >> 9, len >> 9, GFP_KERNEL, 0); break; default: return -EOPNOTSUPP; } if (error) return error; /* * Invalidate again; if someone wandered in and dirtied a page, * the caller will be given -EBUSY. The third argument is * inclusive, so the rounding here is safe. */ return invalidate_inode_pages2_range(mapping, start >> PAGE_SHIFT, end >> PAGE_SHIFT); } |
4b6f5d20b [PATCH] Make most... |
1949 |
const struct file_operations def_blk_fops = { |
1da177e4c Linux-2.6.12-rc2 |
1950 1951 1952 |
.open = blkdev_open, .release = blkdev_close, .llseek = block_llseek, |
a886038ba fs/block_dev.c: s... |
1953 |
.read_iter = blkdev_read_iter, |
1456c0a87 blkdev_aio_write(... |
1954 |
.write_iter = blkdev_write_iter, |
acc93d30d Revert "block: en... |
1955 |
.mmap = generic_file_mmap, |
b1dd3b284 vfs: rename block... |
1956 |
.fsync = blkdev_fsync, |
bb93e3a52 [PATCH] block: ad... |
1957 |
.unlocked_ioctl = block_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
1958 1959 1960 |
#ifdef CONFIG_COMPAT .compat_ioctl = compat_blkdev_ioctl, #endif |
1e8b33328 blockdev: remove ... |
1961 |
.splice_read = generic_file_splice_read, |
8d0207652 ->splice_write() ... |
1962 |
.splice_write = iter_file_splice_write, |
25f4c4141 block: implement ... |
1963 |
.fallocate = blkdev_fallocate, |
1da177e4c Linux-2.6.12-rc2 |
1964 1965 1966 1967 1968 1969 1970 |
}; int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg) { int res; mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); |
56b26add0 [PATCH] kill the ... |
1971 |
res = blkdev_ioctl(bdev, 0, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1972 1973 1974 1975 1976 1977 1978 1979 |
set_fs(old_fs); return res; } EXPORT_SYMBOL(ioctl_by_bdev); /** * lookup_bdev - lookup a struct block_device by name |
94e2959e7 fs: fix function ... |
1980 |
* @pathname: special file representing the block device |
1da177e4c Linux-2.6.12-rc2 |
1981 |
* |
57d1b5366 block_dev: fix ke... |
1982 |
* Get a reference to the blockdevice at @pathname in the current |
1da177e4c Linux-2.6.12-rc2 |
1983 1984 1985 |
* namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ |
421748ecd [PATCH] assorted ... |
1986 |
struct block_device *lookup_bdev(const char *pathname) |
1da177e4c Linux-2.6.12-rc2 |
1987 1988 1989 |
{ struct block_device *bdev; struct inode *inode; |
421748ecd [PATCH] assorted ... |
1990 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
1991 |
int error; |
421748ecd [PATCH] assorted ... |
1992 |
if (!pathname || !*pathname) |
1da177e4c Linux-2.6.12-rc2 |
1993 |
return ERR_PTR(-EINVAL); |
421748ecd [PATCH] assorted ... |
1994 |
error = kern_path(pathname, LOOKUP_FOLLOW, &path); |
1da177e4c Linux-2.6.12-rc2 |
1995 1996 |
if (error) return ERR_PTR(error); |
bb668734c VFS: assorted d_b... |
1997 |
inode = d_backing_inode(path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
1998 1999 2000 2001 |
error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) goto fail; error = -EACCES; |
a2982cc92 vfs: Generalize f... |
2002 |
if (!may_open_dev(&path)) |
1da177e4c Linux-2.6.12-rc2 |
2003 2004 2005 2006 2007 2008 |
goto fail; error = -ENOMEM; bdev = bd_acquire(inode); if (!bdev) goto fail; out: |
421748ecd [PATCH] assorted ... |
2009 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
2010 2011 2012 2013 2014 |
return bdev; fail: bdev = ERR_PTR(error); goto out; } |
d5686b444 [PATCH] switch mt... |
2015 |
EXPORT_SYMBOL(lookup_bdev); |
1da177e4c Linux-2.6.12-rc2 |
2016 |
|
93b270f76 Fix over-zealous ... |
2017 |
int __invalidate_device(struct block_device *bdev, bool kill_dirty) |
b71e8a4ce [PATCH] BLOCK: Mo... |
2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 |
{ struct super_block *sb = get_super(bdev); int res = 0; if (sb) { /* * no need to lock the super, get_super holds the * read mutex so the filesystem cannot go away * under us (->put_super runs with the write lock * hold). */ shrink_dcache_sb(sb); |
93b270f76 Fix over-zealous ... |
2030 |
res = invalidate_inodes(sb, kill_dirty); |
b71e8a4ce [PATCH] BLOCK: Mo... |
2031 2032 |
drop_super(sb); } |
f98393a64 mm: remove destro... |
2033 |
invalidate_bdev(bdev); |
b71e8a4ce [PATCH] BLOCK: Mo... |
2034 2035 2036 |
return res; } EXPORT_SYMBOL(__invalidate_device); |
5c0d6b60a vfs: Create funct... |
2037 2038 2039 2040 |
void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) { struct inode *inode, *old_inode = NULL; |
74278da9f inode: convert in... |
2041 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2042 2043 |
list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) { struct address_space *mapping = inode->i_mapping; |
af309226d block: protect it... |
2044 |
struct block_device *bdev; |
5c0d6b60a vfs: Create funct... |
2045 2046 2047 2048 2049 2050 2051 2052 2053 |
spin_lock(&inode->i_lock); if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW) || mapping->nrpages == 0) { spin_unlock(&inode->i_lock); continue; } __iget(inode); spin_unlock(&inode->i_lock); |
74278da9f inode: convert in... |
2054 |
spin_unlock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2055 2056 2057 |
/* * We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the |
74278da9f inode: convert in... |
2058 |
* s_inode_list_lock We cannot iput the inode now as we can |
5c0d6b60a vfs: Create funct... |
2059 |
* be holding the last reference and we cannot iput it under |
74278da9f inode: convert in... |
2060 |
* s_inode_list_lock. So we keep the reference and iput it |
5c0d6b60a vfs: Create funct... |
2061 2062 2063 2064 |
* later. */ iput(old_inode); old_inode = inode; |
af309226d block: protect it... |
2065 |
bdev = I_BDEV(inode); |
5c0d6b60a vfs: Create funct... |
2066 |
|
af309226d block: protect it... |
2067 2068 2069 2070 |
mutex_lock(&bdev->bd_mutex); if (bdev->bd_openers) func(bdev, arg); mutex_unlock(&bdev->bd_mutex); |
5c0d6b60a vfs: Create funct... |
2071 |
|
74278da9f inode: convert in... |
2072 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2073 |
} |
74278da9f inode: convert in... |
2074 |
spin_unlock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2075 2076 |
iput(old_inode); } |