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fs/block_dev.c
53.5 KB
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// SPDX-License-Identifier: GPL-2.0-only |
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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/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> |
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#include <linux/pseudo_fs.h> |
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#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/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 <linux/suspend.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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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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static 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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/* 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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|
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/* * Drop all buffers & page cache for given bdev range. This function bails * with error if bdev has other exclusive owner (such as filesystem). */ int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, loff_t lend) { struct block_device *claimed_bdev = NULL; int err; /* * If we don't hold exclusive handle for the device, upgrade to it * while we discard the buffer cache to avoid discarding buffers * under live filesystem. */ if (!(mode & FMODE_EXCL)) { claimed_bdev = bdev->bd_contains; err = bd_prepare_to_claim(bdev, claimed_bdev, truncate_bdev_range); if (err) return err; } truncate_inode_pages_range(bdev->bd_inode->i_mapping, lstart, lend); if (claimed_bdev) bd_abort_claiming(bdev, claimed_bdev, truncate_bdev_range); return 0; } EXPORT_SYMBOL(truncate_bdev_range); |
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static void set_init_blocksize(struct block_device *bdev) { |
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bdev->bd_inode->i_blkbits = blksize_bits(bdev_logical_block_size(bdev)); |
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} |
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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 */ |
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if (bdev->bd_inode->i_blkbits != blksize_bits(size)) { |
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sync_blockdev(bdev); |
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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); |
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blk_wake_io_task(waiter); |
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} 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; |
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loff_t pos = iocb->ki_pos; bool should_dirty = false; struct bio bio; ssize_t ret; blk_qc_t qc; |
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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; |
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if (nr_pages <= DIO_INLINE_BIO_VECS) vecs = inline_vecs; else { |
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vecs = kmalloc_array(nr_pages, sizeof(struct bio_vec), GFP_KERNEL); |
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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; |
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bio.bi_ioprio = iocb->ki_ioprio; |
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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); } |
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if (iocb->ki_flags & IOCB_HIPRI) |
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bio_set_polled(&bio, iocb); |
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qc = submit_bio(&bio); for (;;) { |
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set_current_state(TASK_UNINTERRUPTIBLE); |
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if (!READ_ONCE(bio.bi_private)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || |
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!blk_poll(bdev_get_queue(bdev), qc, true)) |
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blk_io_schedule(); |
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} __set_current_state(TASK_RUNNING); |
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bio_release_pages(&bio, should_dirty); |
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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; }; |
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static struct bio_set blkdev_dio_pool; |
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|
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static int blkdev_iopoll(struct kiocb *kiocb, bool wait) { struct block_device *bdev = I_BDEV(kiocb->ki_filp->f_mapping->host); struct request_queue *q = bdev_get_queue(bdev); return blk_poll(q, READ_ONCE(kiocb->ki_cookie), wait); } |
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static void blkdev_bio_end_io(struct bio *bio) { struct blkdev_dio *dio = bio->bi_private; bool should_dirty = dio->should_dirty; |
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if (bio->bi_status && !dio->bio.bi_status) dio->bio.bi_status = bio->bi_status; if (!dio->multi_bio || atomic_dec_and_test(&dio->ref)) { |
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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); |
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if (dio->multi_bio) bio_put(&dio->bio); |
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} else { struct task_struct *waiter = dio->waiter; WRITE_ONCE(dio->waiter, NULL); |
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blk_wake_io_task(waiter); |
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} } if (should_dirty) { bio_check_pages_dirty(bio); } else { |
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bio_release_pages(bio, false); |
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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_poll = (iocb->ki_flags & IOCB_HIPRI) != 0; |
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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; |
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bio = bio_alloc_bioset(GFP_KERNEL, nr_pages, &blkdev_dio_pool); |
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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) { |
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dio->waiter = current; |
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bio_get(bio); } else { |
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dio->iocb = iocb; |
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} |
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dio->size = 0; dio->multi_bio = false; |
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dio->should_dirty = is_read && iter_is_iovec(iter); |
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|
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/* * Don't plug for HIPRI/polled IO, as those should go straight * to issue */ if (!is_poll) 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; |
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bio->bi_ioprio = iocb->ki_ioprio; |
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|
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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); } |
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dio->size += bio->bi_iter.bi_size; |
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pos += bio->bi_iter.bi_size; nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES); if (!nr_pages) { |
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bool polled = false; if (iocb->ki_flags & IOCB_HIPRI) { |
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bio_set_polled(bio, iocb); |
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polled = true; } |
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|
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qc = submit_bio(bio); |
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if (polled) WRITE_ONCE(iocb->ki_cookie, qc); |
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break; } if (!dio->multi_bio) { |
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/* * AIO needs an extra reference to ensure the dio * structure which is embedded into the first bio * stays around. */ if (!is_sync) bio_get(bio); |
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dio->multi_bio = true; atomic_set(&dio->ref, 2); } else { atomic_inc(&dio->ref); } |
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submit_bio(bio); bio = bio_alloc(GFP_KERNEL, nr_pages); |
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} |
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if (!is_poll) blk_finish_plug(&plug); |
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|
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if (!is_sync) |
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return -EIOCBQUEUED; for (;;) { |
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set_current_state(TASK_UNINTERRUPTIBLE); |
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438 439 440 441 |
if (!READ_ONCE(dio->waiter)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || |
0a1b8b87d block: make blk_p... |
442 |
!blk_poll(bdev_get_queue(bdev), qc, true)) |
e6249cdd4 block: add blk_io... |
443 |
blk_io_schedule(); |
542ff7bf1 block: new direct... |
444 445 |
} __set_current_state(TASK_RUNNING); |
36ffc6c1c block_dev: propag... |
446 |
if (!ret) |
4e4cbee93 block: switch bio... |
447 |
ret = blk_status_to_errno(dio->bio.bi_status); |
e15c2ffa1 block: fix O_DIRE... |
448 449 |
if (likely(!ret)) ret = dio->size; |
542ff7bf1 block: new direct... |
450 451 452 453 454 455 456 457 |
bio_put(&dio->bio); return ret; } static ssize_t blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) { |
189ce2b9d block: fast-path ... |
458 |
int nr_pages; |
b2e895dbd [PATCH] revert bl... |
459 |
|
72ecad22d block: support a ... |
460 |
nr_pages = iov_iter_npages(iter, BIO_MAX_PAGES + 1); |
189ce2b9d block: fast-path ... |
461 462 |
if (!nr_pages) return 0; |
72ecad22d block: support a ... |
463 |
if (is_sync_kiocb(iocb) && nr_pages <= BIO_MAX_PAGES) |
189ce2b9d block: fast-path ... |
464 |
return __blkdev_direct_IO_simple(iocb, iter, nr_pages); |
542ff7bf1 block: new direct... |
465 466 467 468 469 470 |
return __blkdev_direct_IO(iocb, iter, min(nr_pages, BIO_MAX_PAGES)); } static __init int blkdev_init(void) { |
52190f8ab fs: convert block... |
471 |
return bioset_init(&blkdev_dio_pool, 4, offsetof(struct blkdev_dio, bio), BIOSET_NEED_BVECS); |
b2e895dbd [PATCH] revert bl... |
472 |
} |
542ff7bf1 block: new direct... |
473 |
module_init(blkdev_init); |
b2e895dbd [PATCH] revert bl... |
474 |
|
5cee5815d vfs: Make sys_syn... |
475 476 477 478 479 480 481 482 |
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); } |
585d3bc06 fs: move bdev cod... |
483 484 485 486 487 488 |
/* * 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) { |
5cee5815d vfs: Make sys_syn... |
489 |
return __sync_blockdev(bdev, 1); |
585d3bc06 fs: move bdev cod... |
490 491 492 493 494 495 496 497 498 499 500 501 |
} 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) { |
60b0680fa vfs: Rename fsync... |
502 |
int res = sync_filesystem(sb); |
585d3bc06 fs: move bdev cod... |
503 504 505 506 507 |
drop_super(sb); return res; } return sync_blockdev(bdev); } |
47e4491b4 Cleanup after com... |
508 |
EXPORT_SYMBOL(fsync_bdev); |
585d3bc06 fs: move bdev cod... |
509 510 511 512 513 |
/** * freeze_bdev -- lock a filesystem and force it into a consistent state * @bdev: blockdevice to lock * |
585d3bc06 fs: move bdev cod... |
514 515 516 517 518 519 520 521 522 523 524 525 526 527 |
* 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); |
4504230a7 freeze_bdev: grab... |
528 529 530 531 532 533 |
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. */ |
585d3bc06 fs: move bdev cod... |
534 |
sb = get_super(bdev); |
5bb53c0fb fs/block_dev: fix... |
535 536 |
if (sb) drop_super(sb); |
4504230a7 freeze_bdev: grab... |
537 538 539 540 541 542 543 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); return sb; } sb = get_active_super(bdev); if (!sb) goto out; |
48b6bca6b fs: add freeze_su... |
544 545 546 547 |
if (sb->s_op->freeze_super) error = sb->s_op->freeze_super(sb); else error = freeze_super(sb); |
18e9e5104 Introduce freeze_... |
548 549 550 |
if (error) { deactivate_super(sb); bdev->bd_fsfreeze_count--; |
585d3bc06 fs: move bdev cod... |
551 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
18e9e5104 Introduce freeze_... |
552 |
return ERR_PTR(error); |
585d3bc06 fs: move bdev cod... |
553 |
} |
18e9e5104 Introduce freeze_... |
554 |
deactivate_super(sb); |
4504230a7 freeze_bdev: grab... |
555 |
out: |
585d3bc06 fs: move bdev cod... |
556 557 |
sync_blockdev(bdev); mutex_unlock(&bdev->bd_fsfreeze_mutex); |
4fadd7bb2 freeze_bdev: kill... |
558 |
return sb; /* thaw_bdev releases s->s_umount */ |
585d3bc06 fs: move bdev cod... |
559 560 561 562 563 564 565 566 567 568 569 570 |
} 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... |
571 |
int error = -EINVAL; |
585d3bc06 fs: move bdev cod... |
572 573 |
mutex_lock(&bdev->bd_fsfreeze_mutex); |
4504230a7 freeze_bdev: grab... |
574 |
if (!bdev->bd_fsfreeze_count) |
18e9e5104 Introduce freeze_... |
575 |
goto out; |
4504230a7 freeze_bdev: grab... |
576 577 578 |
error = 0; if (--bdev->bd_fsfreeze_count > 0) |
18e9e5104 Introduce freeze_... |
579 |
goto out; |
4504230a7 freeze_bdev: grab... |
580 581 |
if (!sb) |
18e9e5104 Introduce freeze_... |
582 |
goto out; |
4504230a7 freeze_bdev: grab... |
583 |
|
48b6bca6b fs: add freeze_su... |
584 585 586 587 |
if (sb->s_op->thaw_super) error = sb->s_op->thaw_super(sb); else error = thaw_super(sb); |
997198ba1 fs/block_dev.c: r... |
588 |
if (error) |
18e9e5104 Introduce freeze_... |
589 |
bdev->bd_fsfreeze_count++; |
18e9e5104 Introduce freeze_... |
590 |
out: |
585d3bc06 fs: move bdev cod... |
591 |
mutex_unlock(&bdev->bd_fsfreeze_mutex); |
997198ba1 fs/block_dev.c: r... |
592 |
return error; |
585d3bc06 fs: move bdev cod... |
593 594 |
} EXPORT_SYMBOL(thaw_bdev); |
1da177e4c Linux-2.6.12-rc2 |
595 596 597 598 599 600 601 602 603 |
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); } |
d4388340a fs: convert mpage... |
604 |
static void blkdev_readahead(struct readahead_control *rac) |
447f05bb4 block_dev: implem... |
605 |
{ |
d4388340a fs: convert mpage... |
606 |
mpage_readahead(rac, blkdev_get_block); |
447f05bb4 block_dev: implem... |
607 |
} |
6272b5a58 block_dev: conver... |
608 609 610 |
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 |
611 |
{ |
155130a4f get rid of block_... |
612 613 |
return block_write_begin(mapping, pos, len, flags, pagep, blkdev_get_block); |
1da177e4c Linux-2.6.12-rc2 |
614 |
} |
6272b5a58 block_dev: conver... |
615 616 617 |
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 |
618 |
{ |
6272b5a58 block_dev: conver... |
619 620 621 622 |
int ret; ret = block_write_end(file, mapping, pos, len, copied, page, fsdata); unlock_page(page); |
09cbfeaf1 mm, fs: get rid o... |
623 |
put_page(page); |
6272b5a58 block_dev: conver... |
624 625 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
626 627 628 629 |
} /* * private llseek: |
496ad9aa8 new helper: file_... |
630 |
* for a block special file file_inode(file)->i_size is zero |
1da177e4c Linux-2.6.12-rc2 |
631 632 |
* so we compute the size by hand (just as in block_read/write above) */ |
965c8e59c lseek: the "whenc... |
633 |
static loff_t block_llseek(struct file *file, loff_t offset, int whence) |
1da177e4c Linux-2.6.12-rc2 |
634 |
{ |
4ebb16ca9 block: introduce ... |
635 |
struct inode *bd_inode = bdev_file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
636 |
loff_t retval; |
5955102c9 wrappers for ->i_... |
637 |
inode_lock(bd_inode); |
5d48f3a2d block_dev: switch... |
638 |
retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode)); |
5955102c9 wrappers for ->i_... |
639 |
inode_unlock(bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 |
return retval; } |
02c24a821 fs: push i_mutex ... |
643 |
int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
1da177e4c Linux-2.6.12-rc2 |
644 |
{ |
4ebb16ca9 block: introduce ... |
645 |
struct inode *bd_inode = bdev_file_inode(filp); |
b8af67e26 fs/block_dev.c: f... |
646 |
struct block_device *bdev = I_BDEV(bd_inode); |
ab0a9735e blkdev: flush dis... |
647 |
int error; |
da5aa861b fix block device ... |
648 |
|
372cf243e block: convert to... |
649 |
error = file_write_and_wait_range(filp, start, end); |
da5aa861b fix block device ... |
650 651 |
if (error) return error; |
ab0a9735e blkdev: flush dis... |
652 |
|
b8af67e26 fs/block_dev.c: f... |
653 654 655 656 657 |
/* * 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. */ |
9398554fb block: remove the... |
658 |
error = blkdev_issue_flush(bdev, GFP_KERNEL); |
ab0a9735e blkdev: flush dis... |
659 660 |
if (error == -EOPNOTSUPP) error = 0; |
b8af67e26 fs/block_dev.c: f... |
661 |
|
ab0a9735e blkdev: flush dis... |
662 |
return error; |
1da177e4c Linux-2.6.12-rc2 |
663 |
} |
b1dd3b284 vfs: rename block... |
664 |
EXPORT_SYMBOL(blkdev_fsync); |
1da177e4c Linux-2.6.12-rc2 |
665 |
|
47a191fd3 fs/block_dev.c: a... |
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 |
/** * 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... |
686 |
int result = -EOPNOTSUPP; |
f68eb1e71 fs/block_dev.c: s... |
687 |
if (!ops->rw_page || bdev_get_integrity(bdev)) |
2e6edc953 block: protect rw... |
688 |
return result; |
e556f6ba1 block: remove the... |
689 |
result = blk_queue_enter(bdev->bd_disk->queue, 0); |
2e6edc953 block: protect rw... |
690 691 |
if (result) return result; |
3f289dcb4 block: make bdev_... |
692 693 |
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, REQ_OP_READ); |
e556f6ba1 block: remove the... |
694 |
blk_queue_exit(bdev->bd_disk->queue); |
2e6edc953 block: protect rw... |
695 |
return result; |
47a191fd3 fs/block_dev.c: a... |
696 |
} |
47a191fd3 fs/block_dev.c: a... |
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 |
/** * 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... |
721 |
const struct block_device_operations *ops = bdev->bd_disk->fops; |
2e6edc953 block: protect rw... |
722 |
|
f68eb1e71 fs/block_dev.c: s... |
723 |
if (!ops->rw_page || bdev_get_integrity(bdev)) |
47a191fd3 fs/block_dev.c: a... |
724 |
return -EOPNOTSUPP; |
e556f6ba1 block: remove the... |
725 |
result = blk_queue_enter(bdev->bd_disk->queue, 0); |
2e6edc953 block: protect rw... |
726 727 |
if (result) return result; |
47a191fd3 fs/block_dev.c: a... |
728 |
set_page_writeback(page); |
3f289dcb4 block: make bdev_... |
729 730 |
result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, REQ_OP_WRITE); |
f892760aa fs/mpage.c: fix m... |
731 |
if (result) { |
47a191fd3 fs/block_dev.c: a... |
732 |
end_page_writeback(page); |
f892760aa fs/mpage.c: fix m... |
733 734 |
} else { clean_page_buffers(page); |
47a191fd3 fs/block_dev.c: a... |
735 |
unlock_page(page); |
f892760aa fs/mpage.c: fix m... |
736 |
} |
e556f6ba1 block: remove the... |
737 |
blk_queue_exit(bdev->bd_disk->queue); |
47a191fd3 fs/block_dev.c: a... |
738 739 |
return result; } |
47a191fd3 fs/block_dev.c: a... |
740 |
|
1da177e4c Linux-2.6.12-rc2 |
741 742 743 744 745 |
/* * pseudo-fs */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(bdev_lock); |
e18b890bb [PATCH] slab: rem... |
746 |
static struct kmem_cache * bdev_cachep __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
747 748 749 |
static struct inode *bdev_alloc_inode(struct super_block *sb) { |
e94b17660 [PATCH] slab: rem... |
750 |
struct bdev_inode *ei = kmem_cache_alloc(bdev_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 754 |
if (!ei) return NULL; return &ei->vfs_inode; } |
41149cb08 bdev: switch to -... |
755 |
static void bdev_free_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
756 |
{ |
41149cb08 bdev: switch to -... |
757 |
kmem_cache_free(bdev_cachep, BDEV_I(inode)); |
fa0d7e3de fs: icache RCU fr... |
758 |
} |
51cc50685 SL*B: drop kmem c... |
759 |
static void init_once(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
760 761 762 |
{ struct bdev_inode *ei = (struct bdev_inode *) foo; struct block_device *bdev = &ei->bdev; |
a35afb830 Remove SLAB_CTOR_... |
763 764 |
memset(bdev, 0, sizeof(*bdev)); mutex_init(&bdev->bd_mutex); |
49731baa4 block: restore mu... |
765 766 767 |
#ifdef CONFIG_SYSFS INIT_LIST_HEAD(&bdev->bd_holder_disks); #endif |
a5a79d000 block: Initialize... |
768 |
bdev->bd_bdi = &noop_backing_dev_info; |
a35afb830 Remove SLAB_CTOR_... |
769 |
inode_init_once(&ei->vfs_inode); |
fcccf5025 filesystem freeze... |
770 771 |
/* Initialize mutex for freeze. */ mutex_init(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
772 |
} |
b57922d97 convert remaining... |
773 |
static void bdev_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
774 775 |
{ struct block_device *bdev = &BDEV_I(inode)->bdev; |
91b0abe36 mm + fs: store sh... |
776 |
truncate_inode_pages_final(&inode->i_data); |
b57922d97 convert remaining... |
777 |
invalidate_inode_buffers(inode); /* is it needed here? */ |
dbd5768f8 vfs: Rename end_w... |
778 |
clear_inode(inode); |
f759741d9 block: Fix oops i... |
779 780 |
/* Detach inode from wb early as bdi_put() may free bdi->wb */ inode_detach_wb(inode); |
a5a79d000 block: Initialize... |
781 |
if (bdev->bd_bdi != &noop_backing_dev_info) { |
b1d2dc565 block: Make blk_g... |
782 |
bdi_put(bdev->bd_bdi); |
a5a79d000 block: Initialize... |
783 784 |
bdev->bd_bdi = &noop_backing_dev_info; } |
1da177e4c Linux-2.6.12-rc2 |
785 |
} |
ee9b6d61a [PATCH] Mark stru... |
786 |
static const struct super_operations bdev_sops = { |
1da177e4c Linux-2.6.12-rc2 |
787 788 |
.statfs = simple_statfs, .alloc_inode = bdev_alloc_inode, |
41149cb08 bdev: switch to -... |
789 |
.free_inode = bdev_free_inode, |
1da177e4c Linux-2.6.12-rc2 |
790 |
.drop_inode = generic_delete_inode, |
b57922d97 convert remaining... |
791 |
.evict_inode = bdev_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
792 |
}; |
9030d16eb vfs: Convert bdev... |
793 |
static int bd_init_fs_context(struct fs_context *fc) |
1da177e4c Linux-2.6.12-rc2 |
794 |
{ |
9030d16eb vfs: Convert bdev... |
795 796 797 798 799 800 |
struct pseudo_fs_context *ctx = init_pseudo(fc, BDEVFS_MAGIC); if (!ctx) return -ENOMEM; fc->s_iflags |= SB_I_CGROUPWB; ctx->ops = &bdev_sops; return 0; |
1da177e4c Linux-2.6.12-rc2 |
801 802 803 804 |
} static struct file_system_type bd_type = { .name = "bdev", |
9030d16eb vfs: Convert bdev... |
805 |
.init_fs_context = bd_init_fs_context, |
1da177e4c Linux-2.6.12-rc2 |
806 807 |
.kill_sb = kill_anon_super, }; |
a212b105b bdi: make inode_t... |
808 809 |
struct super_block *blockdev_superblock __read_mostly; EXPORT_SYMBOL_GPL(blockdev_superblock); |
1da177e4c Linux-2.6.12-rc2 |
810 811 812 813 |
void __init bdev_cache_init(void) { int err; |
ace8577ae block_dev: Suppre... |
814 |
static struct vfsmount *bd_mnt; |
c2acf7b90 fs/block_dev.c: _... |
815 |
|
1da177e4c Linux-2.6.12-rc2 |
816 |
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), |
fffb60f93 [PATCH] cpuset me... |
817 |
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
5d097056c kmemcg: account c... |
818 |
SLAB_MEM_SPREAD|SLAB_ACCOUNT|SLAB_PANIC), |
20c2df83d mm: Remove slab d... |
819 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
820 821 822 823 |
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 |
824 825 |
if (IS_ERR(bd_mnt)) panic("Cannot create bdev pseudo-fs"); |
ace8577ae block_dev: Suppre... |
826 |
blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ |
1da177e4c Linux-2.6.12-rc2 |
827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 |
} /* * 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; } |
10ed16662 block: add a bdge... |
849 |
static struct block_device *bdget(dev_t dev) |
1da177e4c Linux-2.6.12-rc2 |
850 851 852 |
{ struct block_device *bdev; struct inode *inode; |
c2acf7b90 fs/block_dev.c: _... |
853 |
inode = iget5_locked(blockdev_superblock, hash(dev), |
1da177e4c Linux-2.6.12-rc2 |
854 855 856 857 858 859 860 861 |
bdev_test, bdev_set, &dev); if (!inode) return NULL; bdev = &BDEV_I(inode)->bdev; if (inode->i_state & I_NEW) { |
c2b4bb8cb block: fix lockin... |
862 |
spin_lock_init(&bdev->bd_size_lock); |
1da177e4c Linux-2.6.12-rc2 |
863 |
bdev->bd_contains = NULL; |
782b94cdf block: initialise... |
864 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
865 |
bdev->bd_inode = inode; |
1da177e4c Linux-2.6.12-rc2 |
866 |
bdev->bd_part_count = 0; |
1da177e4c Linux-2.6.12-rc2 |
867 868 869 870 871 |
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 |
872 873 874 875 |
unlock_new_inode(inode); } return bdev; } |
dddac6a7b PM / Hibernate: R... |
876 877 878 879 880 881 |
/** * 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() |
882 |
ihold(bdev->bd_inode); |
dddac6a7b PM / Hibernate: R... |
883 884 |
return bdev; } |
c1681bf8a loop: prevent bde... |
885 |
EXPORT_SYMBOL(bdgrab); |
dddac6a7b PM / Hibernate: R... |
886 |
|
10ed16662 block: add a bdge... |
887 888 889 890 |
struct block_device *bdget_part(struct hd_struct *part) { return bdget(part_devt(part)); } |
1da177e4c Linux-2.6.12-rc2 |
891 892 |
long nr_blockdev_pages(void) { |
1008fe6dc block: remove the... |
893 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
894 |
long ret = 0; |
1008fe6dc block: remove the... |
895 896 897 898 899 |
spin_lock(&blockdev_superblock->s_inode_list_lock); list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) ret += inode->i_mapping->nrpages; spin_unlock(&blockdev_superblock->s_inode_list_lock); |
1da177e4c Linux-2.6.12-rc2 |
900 901 902 903 904 905 906 907 908 909 910 911 912 |
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... |
913 |
|
1da177e4c Linux-2.6.12-rc2 |
914 915 |
spin_lock(&bdev_lock); bdev = inode->i_bdev; |
cccd9fb9e block: Revalidate... |
916 |
if (bdev && !inode_unhashed(bdev->bd_inode)) { |
ed8a9d2c8 block: use bd{gra... |
917 |
bdgrab(bdev); |
1da177e4c Linux-2.6.12-rc2 |
918 919 920 921 |
spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
922 |
|
cccd9fb9e block: Revalidate... |
923 924 925 926 927 928 929 930 |
/* * 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 |
931 932 933 |
bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
934 935 |
if (!inode->i_bdev) { /* |
7de9c6ee3 new helper: ihold() |
936 |
* We take an additional reference to bd_inode, |
09d967c6f [PATCH] Fix a rac... |
937 938 939 940 |
* 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... |
941 |
bdgrab(bdev); |
09d967c6f [PATCH] Fix a rac... |
942 943 |
inode->i_bdev = bdev; inode->i_mapping = bdev->bd_inode->i_mapping; |
09d967c6f [PATCH] Fix a rac... |
944 |
} |
1da177e4c Linux-2.6.12-rc2 |
945 946 947 948 949 950 951 952 953 |
spin_unlock(&bdev_lock); } return bdev; } /* Call when you free inode */ void bd_forget(struct inode *inode) { |
09d967c6f [PATCH] Fix a rac... |
954 |
struct block_device *bdev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
955 |
spin_lock(&bdev_lock); |
b4ea2eaa1 fs/block_dev.c: n... |
956 957 |
if (!sb_is_blkdev_sb(inode->i_sb)) bdev = inode->i_bdev; |
a4a4f9439 bdev: get rid of ... |
958 959 |
inode->i_bdev = NULL; inode->i_mapping = &inode->i_data; |
1da177e4c Linux-2.6.12-rc2 |
960 |
spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
961 962 |
if (bdev) |
ed8a9d2c8 block: use bd{gra... |
963 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
964 |
} |
1a3cbbc5a block: factor out... |
965 966 967 968 969 970 |
/** * 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... |
971 |
* Test whether @bdev can be claimed by @holder. |
1a3cbbc5a block: factor out... |
972 973 974 975 976 977 978 979 980 |
* * 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 |
981 |
{ |
1da177e4c Linux-2.6.12-rc2 |
982 |
if (bdev->bd_holder == holder) |
1a3cbbc5a block: factor out... |
983 |
return true; /* already a holder */ |
1da177e4c Linux-2.6.12-rc2 |
984 |
else if (bdev->bd_holder != NULL) |
1a3cbbc5a block: factor out... |
985 |
return false; /* held by someone else */ |
bcc7f5b4b block_dev: don't ... |
986 |
else if (whole == bdev) |
1a3cbbc5a block: factor out... |
987 |
return true; /* is a whole device which isn't held */ |
1da177e4c Linux-2.6.12-rc2 |
988 |
|
e525fd89d block: make blkde... |
989 |
else if (whole->bd_holder == bd_may_claim) |
1a3cbbc5a block: factor out... |
990 991 992 |
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 |
993 |
else |
1a3cbbc5a block: factor out... |
994 995 996 997 |
return true; /* is a partition of an un-held device */ } /** |
58e46ed9c block: refactor b... |
998 |
* bd_prepare_to_claim - claim a block device |
6b4517a79 block: implement ... |
999 1000 1001 1002 |
* @bdev: block device of interest * @whole: the whole device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * |
58e46ed9c block: refactor b... |
1003 1004 1005 |
* Claim @bdev. This function fails if @bdev is already claimed by another * holder and waits if another claiming is in progress. return, the caller * has ownership of bd_claiming and bd_holder[s]. |
6b4517a79 block: implement ... |
1006 1007 1008 1009 |
* * RETURNS: * 0 if @bdev can be claimed, -EBUSY otherwise. */ |
ecbe6bc00 block: use bd_pre... |
1010 1011 |
int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, void *holder) |
6b4517a79 block: implement ... |
1012 1013 |
{ retry: |
58e46ed9c block: refactor b... |
1014 |
spin_lock(&bdev_lock); |
6b4517a79 block: implement ... |
1015 |
/* if someone else claimed, fail */ |
58e46ed9c block: refactor b... |
1016 1017 |
if (!bd_may_claim(bdev, whole, holder)) { spin_unlock(&bdev_lock); |
6b4517a79 block: implement ... |
1018 |
return -EBUSY; |
58e46ed9c block: refactor b... |
1019 |
} |
6b4517a79 block: implement ... |
1020 |
|
e75aa8589 block_dev: always... |
1021 1022 |
/* if claiming is already in progress, wait for it to finish */ if (whole->bd_claiming) { |
6b4517a79 block: implement ... |
1023 1024 1025 1026 1027 1028 1029 |
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); |
6b4517a79 block: implement ... |
1030 1031 1032 1033 |
goto retry; } /* yay, all mine */ |
58e46ed9c block: refactor b... |
1034 1035 |
whole->bd_claiming = holder; spin_unlock(&bdev_lock); |
6b4517a79 block: implement ... |
1036 1037 |
return 0; } |
ecbe6bc00 block: use bd_pre... |
1038 |
EXPORT_SYMBOL_GPL(bd_prepare_to_claim); /* only for the loop driver */ |
6b4517a79 block: implement ... |
1039 |
|
560e7cb2f blockdev: Avoid t... |
1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
static struct gendisk *bdev_get_gendisk(struct block_device *bdev, int *partno) { struct gendisk *disk = get_gendisk(bdev->bd_dev, partno); if (!disk) return NULL; /* * Now that we hold gendisk reference we make sure bdev we looked up is * not stale. If it is, it means device got removed and created before * we looked up gendisk and we fail open in such case. Associating * unhashed bdev with newly created gendisk could lead to two bdevs * (and thus two independent caches) being associated with one device * which is bad. */ if (inode_unhashed(bdev->bd_inode)) { put_disk_and_module(disk); return NULL; } return disk; } |
89e524c04 loop: Fix mount(2... |
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 |
static void bd_clear_claiming(struct block_device *whole, void *holder) { lockdep_assert_held(&bdev_lock); /* tell others that we're done */ BUG_ON(whole->bd_claiming != holder); whole->bd_claiming = NULL; wake_up_bit(&whole->bd_claiming, 0); } /** * bd_finish_claiming - finish claiming of a block device * @bdev: block device of interest |
5b642d8b9 block: integrate ... |
1072 |
* @whole: whole block device |
89e524c04 loop: Fix mount(2... |
1073 1074 1075 1076 1077 |
* @holder: holder that has claimed @bdev * * Finish exclusive open of a block device. Mark the device as exlusively * open by the holder and wake up all waiters for exclusive open to finish. */ |
764b23bd9 block: mark bd_fi... |
1078 1079 |
static void bd_finish_claiming(struct block_device *bdev, struct block_device *whole, void *holder) |
89e524c04 loop: Fix mount(2... |
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 |
{ spin_lock(&bdev_lock); 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; bd_clear_claiming(whole, holder); spin_unlock(&bdev_lock); } |
89e524c04 loop: Fix mount(2... |
1094 1095 1096 1097 |
/** * bd_abort_claiming - abort claiming of a block device * @bdev: block device of interest |
5b642d8b9 block: integrate ... |
1098 |
* @whole: whole block device |
89e524c04 loop: Fix mount(2... |
1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 |
* @holder: holder that has claimed @bdev * * Abort claiming of a block device when the exclusive open failed. This can be * also used when exclusive open is not actually desired and we just needed * to block other exclusive openers for a while. */ void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, void *holder) { spin_lock(&bdev_lock); bd_clear_claiming(whole, holder); spin_unlock(&bdev_lock); } EXPORT_SYMBOL(bd_abort_claiming); |
6b4517a79 block: implement ... |
1113 |
|
641dc636b [PATCH] dm/md dep... |
1114 |
#ifdef CONFIG_SYSFS |
49731baa4 block: restore mu... |
1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 |
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.... |
1131 |
static int add_symlink(struct kobject *from, struct kobject *to) |
641dc636b [PATCH] dm/md dep... |
1132 |
{ |
4d7dd8fd9 [PATCH] blockdev.... |
1133 |
return sysfs_create_link(from, to, kobject_name(to)); |
641dc636b [PATCH] dm/md dep... |
1134 1135 1136 1137 |
} static void del_symlink(struct kobject *from, struct kobject *to) { |
641dc636b [PATCH] dm/md dep... |
1138 1139 |
sysfs_remove_link(from, kobject_name(to)); } |
641dc636b [PATCH] dm/md dep... |
1140 |
/** |
e09b457bd block: simplify h... |
1141 1142 1143 |
* 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 ... |
1144 |
* |
49731baa4 block: restore mu... |
1145 1146 |
* DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * |
e09b457bd block: simplify h... |
1147 |
* This functions creates the following sysfs symlinks. |
641dc636b [PATCH] dm/md dep... |
1148 |
* |
e09b457bd block: simplify h... |
1149 1150 |
* - 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... |
1151 |
* |
e09b457bd block: simplify h... |
1152 1153 |
* 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... |
1154 |
* |
e09b457bd block: simplify h... |
1155 1156 |
* /sys/block/dm-0/slaves/sda --> /sys/block/sda * /sys/block/sda/holders/dm-0 --> /sys/block/dm-0 |
641dc636b [PATCH] dm/md dep... |
1157 |
* |
e09b457bd block: simplify h... |
1158 1159 1160 |
* 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... |
1161 |
* |
e09b457bd block: simplify h... |
1162 1163 |
* CONTEXT: * Might sleep. |
641dc636b [PATCH] dm/md dep... |
1164 |
* |
e09b457bd block: simplify h... |
1165 1166 |
* RETURNS: * 0 on success, -errno on failure. |
641dc636b [PATCH] dm/md dep... |
1167 |
*/ |
e09b457bd block: simplify h... |
1168 |
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
1169 |
{ |
49731baa4 block: restore mu... |
1170 |
struct bd_holder_disk *holder; |
e09b457bd block: simplify h... |
1171 |
int ret = 0; |
641dc636b [PATCH] dm/md dep... |
1172 |
|
2e7b651df [PATCH] remove th... |
1173 |
mutex_lock(&bdev->bd_mutex); |
df6c0cd9a [PATCH] clean up ... |
1174 |
|
49731baa4 block: restore mu... |
1175 |
WARN_ON_ONCE(!bdev->bd_holder); |
4e91672c7 Replace obscure c... |
1176 |
|
e09b457bd block: simplify h... |
1177 1178 1179 |
/* 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... |
1180 |
|
49731baa4 block: restore mu... |
1181 1182 1183 |
holder = bd_find_holder_disk(bdev, disk); if (holder) { holder->refcnt++; |
e09b457bd block: simplify h... |
1184 |
goto out_unlock; |
49731baa4 block: restore mu... |
1185 |
} |
641dc636b [PATCH] dm/md dep... |
1186 |
|
49731baa4 block: restore mu... |
1187 1188 1189 |
holder = kzalloc(sizeof(*holder), GFP_KERNEL); if (!holder) { ret = -ENOMEM; |
e09b457bd block: simplify h... |
1190 1191 |
goto out_unlock; } |
641dc636b [PATCH] dm/md dep... |
1192 |
|
49731baa4 block: restore mu... |
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
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... |
1204 1205 1206 1207 1208 |
/* * 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... |
1209 1210 1211 1212 1213 1214 1215 1216 |
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... |
1217 |
out_unlock: |
b4cf1b72e [PATCH] dm/md dep... |
1218 |
mutex_unlock(&bdev->bd_mutex); |
e09b457bd block: simplify h... |
1219 |
return ret; |
641dc636b [PATCH] dm/md dep... |
1220 |
} |
e09b457bd block: simplify h... |
1221 |
EXPORT_SYMBOL_GPL(bd_link_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1222 |
|
49731baa4 block: restore mu... |
1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 |
/** * 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... |
1234 |
{ |
49731baa4 block: restore mu... |
1235 |
struct bd_holder_disk *holder; |
641dc636b [PATCH] dm/md dep... |
1236 |
|
49731baa4 block: restore mu... |
1237 |
mutex_lock(&bdev->bd_mutex); |
641dc636b [PATCH] dm/md dep... |
1238 |
|
49731baa4 block: restore mu... |
1239 1240 1241 1242 1243 1244 |
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... |
1245 |
kobject_put(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
1246 1247 1248 1249 1250 |
list_del_init(&holder->list); kfree(holder); } mutex_unlock(&bdev->bd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1251 |
} |
49731baa4 block: restore mu... |
1252 |
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1253 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1254 |
|
0c002c2f7 Wrapper for lower... |
1255 |
/** |
57d1b5366 block_dev: fix ke... |
1256 |
* check_disk_size_change - checks for disk size change and adjusts bdev size. |
c3279d145 Adjust block devi... |
1257 1258 |
* @disk: struct gendisk to check * @bdev: struct bdev to adjust. |
5afb78356 block: don't prin... |
1259 |
* @verbose: if %true log a message about a size change if there is any |
c3279d145 Adjust block devi... |
1260 1261 |
* * This routine checks to see if the bdev size does not match the disk size |
849cf5596 fs: don't flush p... |
1262 1263 |
* and adjusts it if it differs. When shrinking the bdev size, its all caches * are freed. |
c3279d145 Adjust block devi... |
1264 |
*/ |
a1548b674 block: move resca... |
1265 1266 |
static void check_disk_size_change(struct gendisk *disk, struct block_device *bdev, bool verbose) |
c3279d145 Adjust block devi... |
1267 1268 |
{ loff_t disk_size, bdev_size; |
c2b4bb8cb block: fix lockin... |
1269 |
spin_lock(&bdev->bd_size_lock); |
c3279d145 Adjust block devi... |
1270 1271 1272 |
disk_size = (loff_t)get_capacity(disk) << 9; bdev_size = i_size_read(bdev->bd_inode); if (disk_size != bdev_size) { |
5afb78356 block: don't prin... |
1273 1274 1275 1276 1277 1278 |
if (verbose) { printk(KERN_INFO "%s: detected capacity change from %lld to %lld ", disk->disk_name, bdev_size, disk_size); } |
c3279d145 Adjust block devi... |
1279 |
i_size_write(bdev->bd_inode, disk_size); |
c2b4bb8cb block: fix lockin... |
1280 |
} |
c2b4bb8cb block: fix lockin... |
1281 1282 1283 1284 |
spin_unlock(&bdev->bd_size_lock); if (bdev_size > disk_size) { if (__invalidate_device(bdev, false)) |
9a3ffbbc6 block: remove flu... |
1285 1286 1287 |
pr_warn("VFS: busy inodes on resized disk %s ", disk->disk_name); |
c3279d145 Adjust block devi... |
1288 1289 |
} } |
c3279d145 Adjust block devi... |
1290 1291 |
/** |
659e56ba8 block: add a new ... |
1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 |
* revalidate_disk_size - checks for disk size change and adjusts bdev size. * @disk: struct gendisk to check * @verbose: if %true log a message about a size change if there is any * * This routine checks to see if the bdev size does not match the disk size * and adjusts it if it differs. When shrinking the bdev size, its all caches * are freed. */ void revalidate_disk_size(struct gendisk *disk, bool verbose) { struct block_device *bdev; /* * Hidden disks don't have associated bdev so there's no point in * revalidating them. */ if (disk->flags & GENHD_FL_HIDDEN) return; bdev = bdget_disk(disk, 0); if (bdev) { check_disk_size_change(disk, bdev, verbose); bdput(bdev); } } EXPORT_SYMBOL(revalidate_disk_size); |
611bee526 block: replace bd... |
1318 |
void bd_set_nr_sectors(struct block_device *bdev, sector_t sectors) |
1da177e4c Linux-2.6.12-rc2 |
1319 |
{ |
c2b4bb8cb block: fix lockin... |
1320 |
spin_lock(&bdev->bd_size_lock); |
611bee526 block: replace bd... |
1321 |
i_size_write(bdev->bd_inode, (loff_t)sectors << SECTOR_SHIFT); |
c2b4bb8cb block: fix lockin... |
1322 |
spin_unlock(&bdev->bd_size_lock); |
1da177e4c Linux-2.6.12-rc2 |
1323 |
} |
611bee526 block: replace bd... |
1324 |
EXPORT_SYMBOL(bd_set_nr_sectors); |
1da177e4c Linux-2.6.12-rc2 |
1325 |
|
4385bab12 make blkdev_put()... |
1326 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); |
37be41241 [PATCH] lockdep: ... |
1327 |
|
142fe8f4b block: fix bdev_d... |
1328 |
int bdev_disk_changed(struct block_device *bdev, bool invalidate) |
a1548b674 block: move resca... |
1329 |
{ |
142fe8f4b block: fix bdev_d... |
1330 |
struct gendisk *disk = bdev->bd_disk; |
a1548b674 block: move resca... |
1331 |
int ret; |
f0b870df8 block: remove (__... |
1332 |
lockdep_assert_held(&bdev->bd_mutex); |
38430f087 block: move the N... |
1333 |
clear_bit(GD_NEED_PART_SCAN, &bdev->bd_disk->state); |
6540fbf6b block: don't clea... |
1334 |
|
a1548b674 block: move resca... |
1335 |
rescan: |
d46430bf5 block: remove the... |
1336 |
ret = blk_drop_partitions(bdev); |
a1548b674 block: move resca... |
1337 1338 |
if (ret) return ret; |
d981cb5b9 block: fix a devi... |
1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 |
/* * Historically we only set the capacity to zero for devices that * support partitions (independ of actually having partitions created). * Doing that is rather inconsistent, but changing it broke legacy * udisks polling for legacy ide-cdrom devices. Use the crude check * below to get the sane behavior for most device while not breaking * userspace for this particular setup. */ if (invalidate) { if (disk_part_scan_enabled(disk) || !(disk->flags & GENHD_FL_REMOVABLE)) set_capacity(disk, 0); } else { if (disk->fops->revalidate_disk) disk->fops->revalidate_disk(disk); } |
a1548b674 block: move resca... |
1355 1356 |
check_disk_size_change(disk, bdev, !invalidate); |
a1548b674 block: move resca... |
1357 |
|
142fe8f4b block: fix bdev_d... |
1358 1359 1360 1361 |
if (get_capacity(disk)) { ret = blk_add_partitions(disk, bdev); if (ret == -EAGAIN) goto rescan; |
490547ca2 block: don't send... |
1362 |
} else if (invalidate) { |
a1548b674 block: move resca... |
1363 1364 1365 1366 1367 |
/* * Tell userspace that the media / partition table may have * changed. */ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE); |
a1548b674 block: move resca... |
1368 |
} |
a1548b674 block: move resca... |
1369 1370 |
return ret; } |
f0b870df8 block: remove (__... |
1371 1372 1373 1374 1375 |
/* * Only exported for for loop and dasd for historic reasons. Don't use in new * code! */ EXPORT_SYMBOL_GPL(bdev_disk_changed); |
a1548b674 block: move resca... |
1376 |
|
6d740cd5b [PATCH] lockdep: ... |
1377 1378 1379 1380 1381 1382 |
/* * bd_mutex locking: * * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ |
5b642d8b9 block: integrate ... |
1383 1384 |
static int __blkdev_get(struct block_device *bdev, fmode_t mode, void *holder, int for_part) |
1da177e4c Linux-2.6.12-rc2 |
1385 |
{ |
5b642d8b9 block: integrate ... |
1386 |
struct block_device *whole = NULL, *claiming = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1387 |
struct gendisk *disk; |
7db9cfd38 devscgroup: check... |
1388 |
int ret; |
cf771cb5a block: make varia... |
1389 |
int partno; |
5b642d8b9 block: integrate ... |
1390 |
bool first_open = false, unblock_events = true, need_restart; |
fe6e9c1f2 [PATCH] fix cgrou... |
1391 |
|
d3374825c md: make devices ... |
1392 |
restart: |
c5638ab41 block: simplify t... |
1393 |
need_restart = false; |
89f97496e block: fix __blkd... |
1394 |
ret = -ENXIO; |
560e7cb2f blockdev: Avoid t... |
1395 |
disk = bdev_get_gendisk(bdev, &partno); |
0762b8bde block: always set... |
1396 |
if (!disk) |
6e9624b8c block: push down ... |
1397 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1398 |
|
5b642d8b9 block: integrate ... |
1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 |
if (partno) { whole = bdget_disk(disk, 0); if (!whole) { ret = -ENOMEM; goto out_put_disk; } } if (!for_part && (mode & FMODE_EXCL)) { WARN_ON_ONCE(!holder); if (whole) claiming = whole; else claiming = bdev; ret = bd_prepare_to_claim(bdev, claiming, holder); if (ret) goto out_put_whole; } |
69e02c59a block: Don't chec... |
1417 |
disk_block_events(disk); |
6796bf54a [PATCH] lockdep: ... |
1418 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
1da177e4c Linux-2.6.12-rc2 |
1419 |
if (!bdev->bd_openers) { |
897366537 genhd: Fix use af... |
1420 |
first_open = true; |
1da177e4c Linux-2.6.12-rc2 |
1421 1422 |
bdev->bd_disk = disk; bdev->bd_contains = bdev; |
c2ee070fb block: cache the ... |
1423 |
bdev->bd_partno = partno; |
03cdadb04 block: disable bl... |
1424 |
|
cf771cb5a block: make varia... |
1425 |
if (!partno) { |
89f97496e block: fix __blkd... |
1426 1427 1428 1429 |
ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) goto out_clear; |
1196f8b81 block: rescan par... |
1430 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1431 |
if (disk->fops->open) { |
572c48921 [PATCH] sanitize ... |
1432 |
ret = disk->fops->open(bdev, mode); |
c5638ab41 block: simplify t... |
1433 1434 1435 1436 1437 1438 |
/* * If we lost a race with 'disk' being deleted, * try again. See md.c */ if (ret == -ERESTARTSYS) need_restart = true; |
1da177e4c Linux-2.6.12-rc2 |
1439 |
} |
7e69723fe block: move bd_se... |
1440 |
|
04906b2f5 blockdev: Fix liv... |
1441 |
if (!ret) { |
611bee526 block: replace bd... |
1442 |
bd_set_nr_sectors(bdev, get_capacity(disk)); |
04906b2f5 blockdev: Fix liv... |
1443 1444 |
set_init_blocksize(bdev); } |
7e69723fe block: move bd_se... |
1445 |
|
1196f8b81 block: rescan par... |
1446 1447 1448 1449 1450 1451 |
/* * 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. */ |
38430f087 block: move the N... |
1452 |
if (test_bit(GD_NEED_PART_SCAN, &disk->state) && |
731dc4868 bdev: Factor out ... |
1453 1454 |
(!ret || ret == -ENOMEDIUM)) bdev_disk_changed(bdev, ret == -ENOMEDIUM); |
5a023cdba block: enable dax... |
1455 |
|
1196f8b81 block: rescan par... |
1456 1457 |
if (ret) goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1458 |
} else { |
37be41241 [PATCH] lockdep: ... |
1459 |
BUG_ON(for_part); |
5b642d8b9 block: integrate ... |
1460 1461 |
ret = __blkdev_get(whole, mode, NULL, 1); if (ret) |
0762b8bde block: always set... |
1462 |
goto out_clear; |
5b642d8b9 block: integrate ... |
1463 |
bdev->bd_contains = bdgrab(whole); |
89f97496e block: fix __blkd... |
1464 |
bdev->bd_part = disk_get_part(disk, partno); |
e71bf0d0e block: fix disk->... |
1465 |
if (!(disk->flags & GENHD_FL_UP) || |
89f97496e block: fix __blkd... |
1466 |
!bdev->bd_part || !bdev->bd_part->nr_sects) { |
1da177e4c Linux-2.6.12-rc2 |
1467 |
ret = -ENXIO; |
0762b8bde block: always set... |
1468 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1469 |
} |
611bee526 block: replace bd... |
1470 |
bd_set_nr_sectors(bdev, bdev->bd_part->nr_sects); |
04906b2f5 blockdev: Fix liv... |
1471 |
set_init_blocksize(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1472 |
} |
03e262798 block: Fix bdi as... |
1473 1474 1475 |
if (bdev->bd_bdi == &noop_backing_dev_info) bdev->bd_bdi = bdi_get(disk->queue->backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
1476 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1477 |
if (bdev->bd_contains == bdev) { |
1196f8b81 block: rescan par... |
1478 1479 |
ret = 0; if (bdev->bd_disk->fops->open) |
572c48921 [PATCH] sanitize ... |
1480 |
ret = bdev->bd_disk->fops->open(bdev, mode); |
1196f8b81 block: rescan par... |
1481 |
/* the same as first opener case, read comment there */ |
38430f087 block: move the N... |
1482 |
if (test_bit(GD_NEED_PART_SCAN, &disk->state) && |
731dc4868 bdev: Factor out ... |
1483 1484 |
(!ret || ret == -ENOMEDIUM)) bdev_disk_changed(bdev, ret == -ENOMEDIUM); |
1196f8b81 block: rescan par... |
1485 1486 |
if (ret) goto out_unlock_bdev; |
1da177e4c Linux-2.6.12-rc2 |
1487 1488 1489 |
} } bdev->bd_openers++; |
37be41241 [PATCH] lockdep: ... |
1490 1491 |
if (for_part) bdev->bd_part_count++; |
5b642d8b9 block: integrate ... |
1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 |
if (claiming) bd_finish_claiming(bdev, claiming, holder); /* * 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(). */ if (claiming && (mode & FMODE_WRITE) && !bdev->bd_write_holder && (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { bdev->bd_write_holder = true; unblock_events = false; } |
c039e3134 [PATCH] sem2mutex... |
1506 |
mutex_unlock(&bdev->bd_mutex); |
5b642d8b9 block: integrate ... |
1507 1508 1509 |
if (unblock_events) disk_unblock_events(disk); |
897366537 genhd: Fix use af... |
1510 1511 1512 |
/* only one opener holds refs to the module and disk */ if (!first_open) put_disk_and_module(disk); |
5b642d8b9 block: integrate ... |
1513 1514 |
if (whole) bdput(whole); |
1da177e4c Linux-2.6.12-rc2 |
1515 |
return 0; |
0762b8bde block: always set... |
1516 |
out_clear: |
89f97496e block: fix __blkd... |
1517 |
disk_put_part(bdev->bd_part); |
1da177e4c Linux-2.6.12-rc2 |
1518 |
bdev->bd_disk = NULL; |
0762b8bde block: always set... |
1519 |
bdev->bd_part = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1520 |
if (bdev != bdev->bd_contains) |
572c48921 [PATCH] sanitize ... |
1521 |
__blkdev_put(bdev->bd_contains, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1522 |
bdev->bd_contains = NULL; |
0762b8bde block: always set... |
1523 |
out_unlock_bdev: |
5b642d8b9 block: integrate ... |
1524 1525 |
if (claiming) bd_abort_claiming(bdev, claiming, holder); |
c039e3134 [PATCH] sem2mutex... |
1526 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1527 |
disk_unblock_events(disk); |
5b642d8b9 block: integrate ... |
1528 1529 1530 1531 |
out_put_whole: if (whole) bdput(whole); out_put_disk: |
9df6c2991 genhd: Add helper... |
1532 |
put_disk_and_module(disk); |
c5638ab41 block: simplify t... |
1533 1534 |
if (need_restart) goto restart; |
4345caba3 block: NULL deref... |
1535 |
out: |
1da177e4c Linux-2.6.12-rc2 |
1536 1537 |
return ret; } |
d4d776299 block: clean up b... |
1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 |
/** * 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. */ |
1fb1a2ad7 block: mark blkde... |
1557 |
static int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
1558 |
{ |
e5c7fb400 block: move the d... |
1559 |
int ret, perm = 0; |
e525fd89d block: make blkde... |
1560 |
|
e5c7fb400 block: move the d... |
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 |
if (mode & FMODE_READ) perm |= MAY_READ; if (mode & FMODE_WRITE) perm |= MAY_WRITE; ret = devcgroup_inode_permission(bdev->bd_inode, perm); if (ret) goto bdput; ret =__blkdev_get(bdev, mode, holder, 0); if (ret) goto bdput; return 0; bdput: bdput(bdev); return ret; |
37be41241 [PATCH] lockdep: ... |
1577 |
} |
1da177e4c Linux-2.6.12-rc2 |
1578 |
|
d4d776299 block: clean up b... |
1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 |
/** * 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... |
1609 1610 1611 1612 |
if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } |
d4d776299 block: clean up b... |
1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 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 |
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 |
1655 1656 1657 |
static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
1658 1659 1660 1661 1662 1663 1664 1665 |
/* * 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; |
a304f0744 block: flag block... |
1666 |
filp->f_mode |= FMODE_NOWAIT | FMODE_BUF_RASYNC; |
c35fc7a5a block_dev: suppor... |
1667 |
|
572c48921 [PATCH] sanitize ... |
1668 1669 1670 1671 1672 1673 |
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 |
1674 |
bdev = bd_acquire(inode); |
6a2aae06c [PATCH] Fix poten... |
1675 1676 |
if (bdev == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1677 |
|
572c48921 [PATCH] sanitize ... |
1678 |
filp->f_mapping = bdev->bd_inode->i_mapping; |
5660e13d2 fs: new infrastru... |
1679 |
filp->f_wb_err = filemap_sample_wb_err(filp->f_mapping); |
572c48921 [PATCH] sanitize ... |
1680 |
|
e525fd89d block: make blkde... |
1681 |
return blkdev_get(bdev, filp->f_mode, filp); |
1da177e4c Linux-2.6.12-rc2 |
1682 |
} |
4385bab12 make blkdev_put()... |
1683 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) |
2e7b651df [PATCH] remove th... |
1684 |
{ |
2e7b651df [PATCH] remove th... |
1685 |
struct gendisk *disk = bdev->bd_disk; |
37be41241 [PATCH] lockdep: ... |
1686 |
struct block_device *victim = NULL; |
2e7b651df [PATCH] remove th... |
1687 |
|
b849dd84b bdev: Reduce time... |
1688 1689 1690 1691 1692 1693 1694 1695 1696 |
/* * Sync early if it looks like we're the last one. If someone else * opens the block device between now and the decrement of bd_openers * then we did a sync that we didn't need to, but that's not the end * of the world and we want to avoid long (could be several minute) * syncs while holding the mutex. */ if (bdev->bd_openers == 1) sync_blockdev(bdev); |
6796bf54a [PATCH] lockdep: ... |
1697 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
37be41241 [PATCH] lockdep: ... |
1698 1699 |
if (for_part) bdev->bd_part_count--; |
2e7b651df [PATCH] remove th... |
1700 |
if (!--bdev->bd_openers) { |
6a027eff6 block: reorganize... |
1701 |
WARN_ON_ONCE(bdev->bd_holders); |
2e7b651df [PATCH] remove th... |
1702 1703 |
sync_blockdev(bdev); kill_bdev(bdev); |
43d1c0eb7 block: detach bde... |
1704 1705 |
bdev_write_inode(bdev); |
2e7b651df [PATCH] remove th... |
1706 1707 1708 |
} if (bdev->bd_contains == bdev) { if (disk->fops->release) |
db2a144be block_device_oper... |
1709 |
disk->fops->release(disk, mode); |
2e7b651df [PATCH] remove th... |
1710 1711 |
} if (!bdev->bd_openers) { |
0762b8bde block: always set... |
1712 1713 |
disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
2e7b651df [PATCH] remove th... |
1714 |
bdev->bd_disk = NULL; |
37be41241 [PATCH] lockdep: ... |
1715 1716 |
if (bdev != bdev->bd_contains) victim = bdev->bd_contains; |
2e7b651df [PATCH] remove th... |
1717 |
bdev->bd_contains = NULL; |
523e1d399 block: make gendi... |
1718 |
|
9df6c2991 genhd: Add helper... |
1719 |
put_disk_and_module(disk); |
2e7b651df [PATCH] remove th... |
1720 |
} |
2e7b651df [PATCH] remove th... |
1721 1722 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
37be41241 [PATCH] lockdep: ... |
1723 |
if (victim) |
9a1c35427 [PATCH] pass fmod... |
1724 |
__blkdev_put(victim, mode, 1); |
2e7b651df [PATCH] remove th... |
1725 |
} |
4385bab12 make blkdev_put()... |
1726 |
void blkdev_put(struct block_device *bdev, fmode_t mode) |
37be41241 [PATCH] lockdep: ... |
1727 |
{ |
85ef06d1d block: flush MEDI... |
1728 |
mutex_lock(&bdev->bd_mutex); |
e525fd89d block: make blkde... |
1729 |
if (mode & FMODE_EXCL) { |
6a027eff6 block: reorganize... |
1730 1731 1732 1733 1734 1735 1736 |
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... |
1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 |
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... |
1749 1750 1751 1752 |
/* * If this was the last claim, remove holder link and * unblock evpoll if it was a write holder. */ |
85ef06d1d block: flush MEDI... |
1753 1754 1755 |
if (bdev_free && bdev->bd_write_holder) { disk_unblock_events(bdev->bd_disk); bdev->bd_write_holder = false; |
77ea887e4 implement in-kern... |
1756 |
} |
6936217cc block: Don't chec... |
1757 |
} |
77ea887e4 implement in-kern... |
1758 |
|
85ef06d1d block: flush MEDI... |
1759 1760 1761 1762 1763 1764 1765 1766 |
/* * 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()... |
1767 |
__blkdev_put(bdev, mode, 0); |
37be41241 [PATCH] lockdep: ... |
1768 |
} |
2e7b651df [PATCH] remove th... |
1769 |
EXPORT_SYMBOL(blkdev_put); |
1da177e4c Linux-2.6.12-rc2 |
1770 1771 |
static int blkdev_close(struct inode * inode, struct file * filp) { |
4ebb16ca9 block: introduce ... |
1772 |
struct block_device *bdev = I_BDEV(bdev_file_inode(filp)); |
4385bab12 make blkdev_put()... |
1773 1774 |
blkdev_put(bdev, filp->f_mode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1775 |
} |
bb93e3a52 [PATCH] block: ad... |
1776 |
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1777 |
{ |
4ebb16ca9 block: introduce ... |
1778 |
struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
56b26add0 [PATCH] kill the ... |
1779 |
fmode_t mode = file->f_mode; |
fd4ce1acd [PATCH 1/2] kill ... |
1780 1781 1782 1783 1784 |
/* * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have * to updated it before every ioctl. */ |
56b26add0 [PATCH] kill the ... |
1785 |
if (file->f_flags & O_NDELAY) |
fd4ce1acd [PATCH 1/2] kill ... |
1786 1787 1788 |
mode |= FMODE_NDELAY; else mode &= ~FMODE_NDELAY; |
56b26add0 [PATCH] kill the ... |
1789 |
return blkdev_ioctl(bdev, mode, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1790 |
} |
87d8fe1ee add releasepage h... |
1791 |
/* |
eef993806 vfs: Rename gener... |
1792 1793 1794 1795 1796 1797 |
* 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(... |
1798 |
ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) |
eef993806 vfs: Rename gener... |
1799 1800 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1801 |
struct inode *bd_inode = bdev_file_inode(file); |
7ec7b94a3 blkdev_write_iter... |
1802 |
loff_t size = i_size_read(bd_inode); |
53362a05a fs/block-dev.c:fi... |
1803 |
struct blk_plug plug; |
eef993806 vfs: Rename gener... |
1804 |
ssize_t ret; |
5f380c7fa lift generic_writ... |
1805 |
|
7ec7b94a3 blkdev_write_iter... |
1806 1807 |
if (bdev_read_only(I_BDEV(bd_inode))) return -EPERM; |
5f380c7fa lift generic_writ... |
1808 |
|
bb3247a39 PM: rewrite is_hi... |
1809 |
if (IS_SWAPFILE(bd_inode) && !is_hibernate_resume_dev(bd_inode->i_rdev)) |
dc617f29d vfs: don't allow ... |
1810 |
return -ETXTBSY; |
7ec7b94a3 blkdev_write_iter... |
1811 |
if (!iov_iter_count(from)) |
5f380c7fa lift generic_writ... |
1812 |
return 0; |
7ec7b94a3 blkdev_write_iter... |
1813 1814 |
if (iocb->ki_pos >= size) return -ENOSPC; |
c35fc7a5a block_dev: suppor... |
1815 1816 |
if ((iocb->ki_flags & (IOCB_NOWAIT | IOCB_DIRECT)) == IOCB_NOWAIT) return -EOPNOTSUPP; |
7ec7b94a3 blkdev_write_iter... |
1817 |
iov_iter_truncate(from, size - iocb->ki_pos); |
eef993806 vfs: Rename gener... |
1818 |
|
53362a05a fs/block-dev.c:fi... |
1819 |
blk_start_plug(&plug); |
1456c0a87 blkdev_aio_write(... |
1820 |
ret = __generic_file_write_iter(iocb, from); |
e25922176 fs: simplify the ... |
1821 1822 |
if (ret > 0) ret = generic_write_sync(iocb, ret); |
53362a05a fs/block-dev.c:fi... |
1823 |
blk_finish_plug(&plug); |
eef993806 vfs: Rename gener... |
1824 1825 |
return ret; } |
1456c0a87 blkdev_aio_write(... |
1826 |
EXPORT_SYMBOL_GPL(blkdev_write_iter); |
eef993806 vfs: Rename gener... |
1827 |
|
b2de525f0 Return short read... |
1828 |
ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
684c9aaeb vfs: fix O_DIRECT... |
1829 1830 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1831 |
struct inode *bd_inode = bdev_file_inode(file); |
684c9aaeb vfs: fix O_DIRECT... |
1832 |
loff_t size = i_size_read(bd_inode); |
a886038ba fs/block_dev.c: s... |
1833 |
loff_t pos = iocb->ki_pos; |
684c9aaeb vfs: fix O_DIRECT... |
1834 1835 1836 1837 1838 |
if (pos >= size) return 0; size -= pos; |
a886038ba fs/block_dev.c: s... |
1839 1840 |
iov_iter_truncate(to, size); return generic_file_read_iter(iocb, to); |
684c9aaeb vfs: fix O_DIRECT... |
1841 |
} |
b2de525f0 Return short read... |
1842 |
EXPORT_SYMBOL_GPL(blkdev_read_iter); |
684c9aaeb vfs: fix O_DIRECT... |
1843 |
|
eef993806 vfs: Rename gener... |
1844 |
/* |
87d8fe1ee add releasepage h... |
1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 |
* 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... |
1857 1858 1859 |
static int blkdev_writepages(struct address_space *mapping, struct writeback_control *wbc) { |
7f6d5b529 dax: move writeba... |
1860 1861 |
return generic_writepages(mapping, wbc); } |
4c54ac62d make struct def_b... |
1862 |
static const struct address_space_operations def_blk_aops = { |
1da177e4c Linux-2.6.12-rc2 |
1863 |
.readpage = blkdev_readpage, |
d4388340a fs: convert mpage... |
1864 |
.readahead = blkdev_readahead, |
1da177e4c Linux-2.6.12-rc2 |
1865 |
.writepage = blkdev_writepage, |
6272b5a58 block_dev: conver... |
1866 1867 |
.write_begin = blkdev_write_begin, .write_end = blkdev_write_end, |
7f6d5b529 dax: move writeba... |
1868 |
.writepages = blkdev_writepages, |
87d8fe1ee add releasepage h... |
1869 |
.releasepage = blkdev_releasepage, |
1da177e4c Linux-2.6.12-rc2 |
1870 |
.direct_IO = blkdev_direct_IO, |
88dbcbb3a blkdev: avoid mig... |
1871 |
.migratepage = buffer_migrate_page_norefs, |
b45972265 mm: vmscan: take ... |
1872 |
.is_dirty_writeback = buffer_check_dirty_writeback, |
1da177e4c Linux-2.6.12-rc2 |
1873 |
}; |
25f4c4141 block: implement ... |
1874 1875 1876 1877 1878 1879 1880 1881 |
#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 ... |
1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 |
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. */ |
384d87ef2 block: Do not dis... |
1909 1910 1911 |
error = truncate_bdev_range(bdev, file->f_mode, start, end); if (error) return error; |
25f4c4141 block: implement ... |
1912 1913 1914 1915 1916 |
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... |
1917 |
GFP_KERNEL, BLKDEV_ZERO_NOUNMAP); |
25f4c4141 block: implement ... |
1918 1919 |
break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE: |
34045129b block_dev: use bl... |
1920 1921 |
error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9, GFP_KERNEL, BLKDEV_ZERO_NOFALLBACK); |
25f4c4141 block: implement ... |
1922 1923 |
break; case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE: |
25f4c4141 block: implement ... |
1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 |
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. */ |
384d87ef2 block: Do not dis... |
1938 |
return invalidate_inode_pages2_range(bdev->bd_inode->i_mapping, |
25f4c4141 block: implement ... |
1939 1940 1941 |
start >> PAGE_SHIFT, end >> PAGE_SHIFT); } |
4b6f5d20b [PATCH] Make most... |
1942 |
const struct file_operations def_blk_fops = { |
1da177e4c Linux-2.6.12-rc2 |
1943 1944 1945 |
.open = blkdev_open, .release = blkdev_close, .llseek = block_llseek, |
a886038ba fs/block_dev.c: s... |
1946 |
.read_iter = blkdev_read_iter, |
1456c0a87 blkdev_aio_write(... |
1947 |
.write_iter = blkdev_write_iter, |
eae83ce10 block: wire up bl... |
1948 |
.iopoll = blkdev_iopoll, |
acc93d30d Revert "block: en... |
1949 |
.mmap = generic_file_mmap, |
b1dd3b284 vfs: rename block... |
1950 |
.fsync = blkdev_fsync, |
bb93e3a52 [PATCH] block: ad... |
1951 |
.unlocked_ioctl = block_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
1952 1953 1954 |
#ifdef CONFIG_COMPAT .compat_ioctl = compat_blkdev_ioctl, #endif |
1e8b33328 blockdev: remove ... |
1955 |
.splice_read = generic_file_splice_read, |
8d0207652 ->splice_write() ... |
1956 |
.splice_write = iter_file_splice_write, |
25f4c4141 block: implement ... |
1957 |
.fallocate = blkdev_fallocate, |
1da177e4c Linux-2.6.12-rc2 |
1958 |
}; |
1da177e4c Linux-2.6.12-rc2 |
1959 1960 |
/** * lookup_bdev - lookup a struct block_device by name |
94e2959e7 fs: fix function ... |
1961 |
* @pathname: special file representing the block device |
1da177e4c Linux-2.6.12-rc2 |
1962 |
* |
57d1b5366 block_dev: fix ke... |
1963 |
* Get a reference to the blockdevice at @pathname in the current |
1da177e4c Linux-2.6.12-rc2 |
1964 1965 1966 |
* namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ |
421748ecd [PATCH] assorted ... |
1967 |
struct block_device *lookup_bdev(const char *pathname) |
1da177e4c Linux-2.6.12-rc2 |
1968 1969 1970 |
{ struct block_device *bdev; struct inode *inode; |
421748ecd [PATCH] assorted ... |
1971 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
1972 |
int error; |
421748ecd [PATCH] assorted ... |
1973 |
if (!pathname || !*pathname) |
1da177e4c Linux-2.6.12-rc2 |
1974 |
return ERR_PTR(-EINVAL); |
421748ecd [PATCH] assorted ... |
1975 |
error = kern_path(pathname, LOOKUP_FOLLOW, &path); |
1da177e4c Linux-2.6.12-rc2 |
1976 1977 |
if (error) return ERR_PTR(error); |
bb668734c VFS: assorted d_b... |
1978 |
inode = d_backing_inode(path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
1979 1980 1981 1982 |
error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) goto fail; error = -EACCES; |
a2982cc92 vfs: Generalize f... |
1983 |
if (!may_open_dev(&path)) |
1da177e4c Linux-2.6.12-rc2 |
1984 1985 1986 1987 1988 1989 |
goto fail; error = -ENOMEM; bdev = bd_acquire(inode); if (!bdev) goto fail; out: |
421748ecd [PATCH] assorted ... |
1990 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
1991 1992 1993 1994 1995 |
return bdev; fail: bdev = ERR_PTR(error); goto out; } |
d5686b444 [PATCH] switch mt... |
1996 |
EXPORT_SYMBOL(lookup_bdev); |
1da177e4c Linux-2.6.12-rc2 |
1997 |
|
93b270f76 Fix over-zealous ... |
1998 |
int __invalidate_device(struct block_device *bdev, bool kill_dirty) |
b71e8a4ce [PATCH] BLOCK: Mo... |
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 |
{ 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 ... |
2011 |
res = invalidate_inodes(sb, kill_dirty); |
b71e8a4ce [PATCH] BLOCK: Mo... |
2012 2013 |
drop_super(sb); } |
f98393a64 mm: remove destro... |
2014 |
invalidate_bdev(bdev); |
b71e8a4ce [PATCH] BLOCK: Mo... |
2015 2016 2017 |
return res; } EXPORT_SYMBOL(__invalidate_device); |
5c0d6b60a vfs: Create funct... |
2018 2019 2020 2021 |
void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) { struct inode *inode, *old_inode = NULL; |
74278da9f inode: convert in... |
2022 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2023 2024 |
list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) { struct address_space *mapping = inode->i_mapping; |
af309226d block: protect it... |
2025 |
struct block_device *bdev; |
5c0d6b60a vfs: Create funct... |
2026 2027 2028 2029 2030 2031 2032 2033 2034 |
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... |
2035 |
spin_unlock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2036 2037 2038 |
/* * 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... |
2039 |
* s_inode_list_lock We cannot iput the inode now as we can |
5c0d6b60a vfs: Create funct... |
2040 |
* be holding the last reference and we cannot iput it under |
74278da9f inode: convert in... |
2041 |
* s_inode_list_lock. So we keep the reference and iput it |
5c0d6b60a vfs: Create funct... |
2042 2043 2044 2045 |
* later. */ iput(old_inode); old_inode = inode; |
af309226d block: protect it... |
2046 |
bdev = I_BDEV(inode); |
5c0d6b60a vfs: Create funct... |
2047 |
|
af309226d block: protect it... |
2048 2049 2050 2051 |
mutex_lock(&bdev->bd_mutex); if (bdev->bd_openers) func(bdev, arg); mutex_unlock(&bdev->bd_mutex); |
5c0d6b60a vfs: Create funct... |
2052 |
|
74278da9f inode: convert in... |
2053 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2054 |
} |
74278da9f inode: convert in... |
2055 |
spin_unlock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
2056 2057 |
iput(old_inode); } |