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fs/block_dev.c
44.2 KB
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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> #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> #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/aio.h> |
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#include <asm/uaccess.h> |
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#include "internal.h" |
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struct bdev_inode { struct block_device bdev; struct inode vfs_inode; }; |
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static const struct address_space_operations def_blk_aops; |
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static inline struct bdev_inode *BDEV_I(struct inode *inode) { return container_of(inode, struct bdev_inode, vfs_inode); } inline struct block_device *I_BDEV(struct inode *inode) { return &BDEV_I(inode)->bdev; } |
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EXPORT_SYMBOL(I_BDEV); |
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/* |
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* Move the inode from its current bdi to a new bdi. Make sure the inode * is clean before moving so that it doesn't linger on the old bdi. |
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*/ static void bdev_inode_switch_bdi(struct inode *inode, struct backing_dev_info *dst) { |
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while (true) { spin_lock(&inode->i_lock); if (!(inode->i_state & I_DIRTY)) { inode->i_data.backing_dev_info = dst; spin_unlock(&inode->i_lock); return; } spin_unlock(&inode->i_lock); WARN_ON_ONCE(write_inode_now(inode, true)); |
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} |
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} |
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/* Kill _all_ buffers and pagecache , dirty or not.. */ |
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void kill_bdev(struct block_device *bdev) |
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{ |
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struct address_space *mapping = bdev->bd_inode->i_mapping; |
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if (mapping->nrpages == 0 && mapping->nrshadows == 0) |
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return; |
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|
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invalidate_bh_lrus(); |
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truncate_inode_pages(mapping, 0); |
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} |
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EXPORT_SYMBOL(kill_bdev); /* Invalidate clean unused buffers and pagecache. */ void invalidate_bdev(struct block_device *bdev) { struct address_space *mapping = bdev->bd_inode->i_mapping; if (mapping->nrpages == 0) return; invalidate_bh_lrus(); lru_add_drain_all(); /* make sure all lru add caches are flushed */ invalidate_mapping_pages(mapping, 0, -1); /* 99% of the time, we don't need to flush the cleancache on the bdev. * But, for the strange corners, lets be cautious */ |
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cleancache_invalidate_inode(mapping); |
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} EXPORT_SYMBOL(invalidate_bdev); |
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int set_blocksize(struct block_device *bdev, int size) { /* Size must be a power of two, and between 512 and PAGE_SIZE */ |
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if (size > PAGE_SIZE || size < 512 || !is_power_of_2(size)) |
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return -EINVAL; /* Size cannot be smaller than the size supported by the device */ |
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if (size < bdev_logical_block_size(bdev)) |
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return -EINVAL; /* Don't change the size if it is same as current */ if (bdev->bd_block_size != size) { sync_blockdev(bdev); bdev->bd_block_size = size; bdev->bd_inode->i_blkbits = blksize_bits(size); kill_bdev(bdev); } return 0; } EXPORT_SYMBOL(set_blocksize); int sb_set_blocksize(struct super_block *sb, int size) { |
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if (set_blocksize(sb->s_bdev, size)) return 0; /* If we get here, we know size is power of two * and it's value is between 512 and PAGE_SIZE */ sb->s_blocksize = size; |
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sb->s_blocksize_bits = blksize_bits(size); |
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return sb->s_blocksize; } EXPORT_SYMBOL(sb_set_blocksize); int sb_min_blocksize(struct super_block *sb, int size) { |
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int minsize = bdev_logical_block_size(sb->s_bdev); |
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if (size < minsize) size = minsize; return sb_set_blocksize(sb, size); } EXPORT_SYMBOL(sb_min_blocksize); static int blkdev_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh, int create) { |
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bh->b_bdev = I_BDEV(inode); bh->b_blocknr = iblock; set_buffer_mapped(bh); return 0; } |
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static ssize_t |
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blkdev_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t offset) |
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{ struct file *file = iocb->ki_filp; struct inode *inode = file->f_mapping->host; |
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return __blockdev_direct_IO(rw, iocb, inode, I_BDEV(inode), iter, offset, blkdev_get_block, |
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NULL, NULL, 0); |
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} |
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int __sync_blockdev(struct block_device *bdev, int wait) { if (!bdev) return 0; if (!wait) return filemap_flush(bdev->bd_inode->i_mapping); return filemap_write_and_wait(bdev->bd_inode->i_mapping); } |
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/* * Write out and wait upon all the dirty data associated with a block * device via its mapping. Does not take the superblock lock. */ int sync_blockdev(struct block_device *bdev) { |
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return __sync_blockdev(bdev, 1); |
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} EXPORT_SYMBOL(sync_blockdev); /* * Write out and wait upon all dirty data associated with this * device. Filesystem data as well as the underlying block * device. Takes the superblock lock. */ int fsync_bdev(struct block_device *bdev) { struct super_block *sb = get_super(bdev); if (sb) { |
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int res = sync_filesystem(sb); |
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drop_super(sb); return res; } return sync_blockdev(bdev); } |
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EXPORT_SYMBOL(fsync_bdev); |
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/** * freeze_bdev -- lock a filesystem and force it into a consistent state * @bdev: blockdevice to lock * |
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* If a superblock is found on this device, we take the s_umount semaphore * on it to make sure nobody unmounts until the snapshot creation is done. * The reference counter (bd_fsfreeze_count) guarantees that only the last * unfreeze process can unfreeze the frozen filesystem actually when multiple * freeze requests arrive simultaneously. It counts up in freeze_bdev() and * count down in thaw_bdev(). When it becomes 0, thaw_bdev() will unfreeze * actually. */ struct super_block *freeze_bdev(struct block_device *bdev) { struct super_block *sb; int error = 0; mutex_lock(&bdev->bd_fsfreeze_mutex); |
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if (++bdev->bd_fsfreeze_count > 1) { /* * We don't even need to grab a reference - the first call * to freeze_bdev grab an active reference and only the last * thaw_bdev drops it. */ |
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sb = get_super(bdev); |
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drop_super(sb); mutex_unlock(&bdev->bd_fsfreeze_mutex); return sb; } sb = get_active_super(bdev); if (!sb) goto out; |
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if (sb->s_op->freeze_super) error = sb->s_op->freeze_super(sb); else error = freeze_super(sb); |
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if (error) { deactivate_super(sb); bdev->bd_fsfreeze_count--; |
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mutex_unlock(&bdev->bd_fsfreeze_mutex); |
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return ERR_PTR(error); |
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} |
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deactivate_super(sb); |
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out: |
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sync_blockdev(bdev); mutex_unlock(&bdev->bd_fsfreeze_mutex); |
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return sb; /* thaw_bdev releases s->s_umount */ |
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} 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) { |
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int error = -EINVAL; |
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mutex_lock(&bdev->bd_fsfreeze_mutex); |
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if (!bdev->bd_fsfreeze_count) |
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goto out; |
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error = 0; if (--bdev->bd_fsfreeze_count > 0) |
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goto out; |
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if (!sb) |
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goto out; |
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|
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if (sb->s_op->thaw_super) error = sb->s_op->thaw_super(sb); else error = thaw_super(sb); |
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if (error) { bdev->bd_fsfreeze_count++; mutex_unlock(&bdev->bd_fsfreeze_mutex); return error; } out: |
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mutex_unlock(&bdev->bd_fsfreeze_mutex); return 0; } EXPORT_SYMBOL(thaw_bdev); |
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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); } |
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static int blkdev_readpages(struct file *file, struct address_space *mapping, struct list_head *pages, unsigned nr_pages) { return mpage_readpages(mapping, pages, nr_pages, blkdev_get_block); } |
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static int blkdev_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) |
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{ |
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return block_write_begin(mapping, pos, len, flags, pagep, blkdev_get_block); |
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} |
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static int blkdev_write_end(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned copied, struct page *page, void *fsdata) |
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{ |
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int ret; ret = block_write_end(file, mapping, pos, len, copied, page, fsdata); unlock_page(page); page_cache_release(page); return ret; |
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} /* * private llseek: |
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* for a block special file file_inode(file)->i_size is zero |
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* so we compute the size by hand (just as in block_read/write above) */ |
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static loff_t block_llseek(struct file *file, loff_t offset, int whence) |
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{ struct inode *bd_inode = file->f_mapping->host; |
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loff_t retval; |
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mutex_lock(&bd_inode->i_mutex); |
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retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode)); |
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mutex_unlock(&bd_inode->i_mutex); |
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return retval; } |
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int blkdev_fsync(struct file *filp, loff_t start, loff_t end, int datasync) |
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{ |
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struct inode *bd_inode = filp->f_mapping->host; struct block_device *bdev = I_BDEV(bd_inode); |
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int error; |
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error = filemap_write_and_wait_range(filp->f_mapping, start, end); if (error) return error; |
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|
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/* * 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. */ |
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error = blkdev_issue_flush(bdev, GFP_KERNEL, NULL); |
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if (error == -EOPNOTSUPP) error = 0; |
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|
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return error; |
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} |
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EXPORT_SYMBOL(blkdev_fsync); |
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|
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/** * 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; if (!ops->rw_page) return -EOPNOTSUPP; return ops->rw_page(bdev, sector + get_start_sect(bdev), page, READ); } EXPORT_SYMBOL_GPL(bdev_read_page); /** * bdev_write_page() - Start writing a page to a block device * @bdev: The device to write the page to * @sector: The offset on the device to write the page to (need not be aligned) * @page: The page to write * @wbc: The writeback_control for the write * * On entry, the page should be locked and not currently under writeback. * On exit, if the write started successfully, the page will be unlocked and * under writeback. If the write failed already (eg the driver failed to * queue the page to the device), the page will still be locked. If the * caller is a ->writepage implementation, it will need to unlock the page. * * Errors returned by this function are usually "soft", eg out of memory, or * queue full; callers should try a different route to write this page rather * than propagate an error back up the stack. * * Return: negative errno if an error occurs, 0 if submission was successful. */ int bdev_write_page(struct block_device *bdev, sector_t sector, struct page *page, struct writeback_control *wbc) { int result; int rw = (wbc->sync_mode == WB_SYNC_ALL) ? WRITE_SYNC : WRITE; const struct block_device_operations *ops = bdev->bd_disk->fops; if (!ops->rw_page) return -EOPNOTSUPP; set_page_writeback(page); result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, rw); if (result) end_page_writeback(page); else unlock_page(page); return result; } EXPORT_SYMBOL_GPL(bdev_write_page); |
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/* * pseudo-fs */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(bdev_lock); |
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static struct kmem_cache * bdev_cachep __read_mostly; |
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static struct inode *bdev_alloc_inode(struct super_block *sb) { |
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struct bdev_inode *ei = kmem_cache_alloc(bdev_cachep, GFP_KERNEL); |
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if (!ei) return NULL; return &ei->vfs_inode; } |
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static void bdev_i_callback(struct rcu_head *head) |
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{ |
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struct inode *inode = container_of(head, struct inode, i_rcu); |
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struct bdev_inode *bdi = BDEV_I(inode); |
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kmem_cache_free(bdev_cachep, bdi); } |
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static void bdev_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, bdev_i_callback); } |
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static void init_once(void *foo) |
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{ struct bdev_inode *ei = (struct bdev_inode *) foo; struct block_device *bdev = &ei->bdev; |
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memset(bdev, 0, sizeof(*bdev)); mutex_init(&bdev->bd_mutex); |
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INIT_LIST_HEAD(&bdev->bd_inodes); INIT_LIST_HEAD(&bdev->bd_list); |
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#ifdef CONFIG_SYSFS INIT_LIST_HEAD(&bdev->bd_holder_disks); #endif |
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inode_init_once(&ei->vfs_inode); |
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/* Initialize mutex for freeze. */ mutex_init(&bdev->bd_fsfreeze_mutex); |
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} static inline void __bd_forget(struct inode *inode) { list_del_init(&inode->i_devices); inode->i_bdev = NULL; inode->i_mapping = &inode->i_data; } |
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static void bdev_evict_inode(struct inode *inode) |
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{ struct block_device *bdev = &BDEV_I(inode)->bdev; struct list_head *p; |
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truncate_inode_pages_final(&inode->i_data); |
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invalidate_inode_buffers(inode); /* is it needed here? */ |
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clear_inode(inode); |
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spin_lock(&bdev_lock); while ( (p = bdev->bd_inodes.next) != &bdev->bd_inodes ) { __bd_forget(list_entry(p, struct inode, i_devices)); } list_del_init(&bdev->bd_list); spin_unlock(&bdev_lock); } |
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static const struct super_operations bdev_sops = { |
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.statfs = simple_statfs, .alloc_inode = bdev_alloc_inode, .destroy_inode = bdev_destroy_inode, .drop_inode = generic_delete_inode, |
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.evict_inode = bdev_evict_inode, |
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}; |
51139adac convert get_sb_ps... |
483 484 |
static struct dentry *bd_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
1da177e4c Linux-2.6.12-rc2 |
485 |
{ |
b502bd115 magic.h: move som... |
486 |
return mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC); |
1da177e4c Linux-2.6.12-rc2 |
487 488 489 490 |
} static struct file_system_type bd_type = { .name = "bdev", |
51139adac convert get_sb_ps... |
491 |
.mount = bd_mount, |
1da177e4c Linux-2.6.12-rc2 |
492 493 |
.kill_sb = kill_anon_super, }; |
f47ec3f28 trim fs/internal.h |
494 |
static struct super_block *blockdev_superblock __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
495 496 497 498 |
void __init bdev_cache_init(void) { int err; |
ace8577ae block_dev: Suppre... |
499 |
static struct vfsmount *bd_mnt; |
c2acf7b90 fs/block_dev.c: _... |
500 |
|
1da177e4c Linux-2.6.12-rc2 |
501 |
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), |
fffb60f93 [PATCH] cpuset me... |
502 503 |
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD|SLAB_PANIC), |
20c2df83d mm: Remove slab d... |
504 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
505 506 507 508 |
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 |
509 510 |
if (IS_ERR(bd_mnt)) panic("Cannot create bdev pseudo-fs"); |
ace8577ae block_dev: Suppre... |
511 |
blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ |
1da177e4c Linux-2.6.12-rc2 |
512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 |
} /* * Most likely _very_ bad one - but then it's hardly critical for small * /dev and can be fixed when somebody will need really large one. * Keep in mind that it will be fed through icache hash function too. */ static inline unsigned long hash(dev_t dev) { return MAJOR(dev)+MINOR(dev); } static int bdev_test(struct inode *inode, void *data) { return BDEV_I(inode)->bdev.bd_dev == *(dev_t *)data; } static int bdev_set(struct inode *inode, void *data) { BDEV_I(inode)->bdev.bd_dev = *(dev_t *)data; return 0; } static LIST_HEAD(all_bdevs); struct block_device *bdget(dev_t dev) { struct block_device *bdev; struct inode *inode; |
c2acf7b90 fs/block_dev.c: _... |
541 |
inode = iget5_locked(blockdev_superblock, hash(dev), |
1da177e4c Linux-2.6.12-rc2 |
542 543 544 545 546 547 548 549 550 |
bdev_test, bdev_set, &dev); if (!inode) return NULL; bdev = &BDEV_I(inode)->bdev; if (inode->i_state & I_NEW) { bdev->bd_contains = NULL; |
782b94cdf block: initialise... |
551 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 |
bdev->bd_inode = inode; bdev->bd_block_size = (1 << inode->i_blkbits); bdev->bd_part_count = 0; bdev->bd_invalidated = 0; inode->i_mode = S_IFBLK; inode->i_rdev = dev; inode->i_bdev = bdev; inode->i_data.a_ops = &def_blk_aops; mapping_set_gfp_mask(&inode->i_data, GFP_USER); inode->i_data.backing_dev_info = &default_backing_dev_info; spin_lock(&bdev_lock); list_add(&bdev->bd_list, &all_bdevs); spin_unlock(&bdev_lock); unlock_new_inode(inode); } return bdev; } EXPORT_SYMBOL(bdget); |
dddac6a7b PM / Hibernate: R... |
571 572 573 574 575 576 |
/** * 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() |
577 |
ihold(bdev->bd_inode); |
dddac6a7b PM / Hibernate: R... |
578 579 |
return bdev; } |
c1681bf8a loop: prevent bde... |
580 |
EXPORT_SYMBOL(bdgrab); |
dddac6a7b PM / Hibernate: R... |
581 |
|
1da177e4c Linux-2.6.12-rc2 |
582 583 |
long nr_blockdev_pages(void) { |
203a2935c fs/block_dev.c: u... |
584 |
struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
585 586 |
long ret = 0; spin_lock(&bdev_lock); |
203a2935c fs/block_dev.c: u... |
587 |
list_for_each_entry(bdev, &all_bdevs, bd_list) { |
1da177e4c Linux-2.6.12-rc2 |
588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 |
ret += bdev->bd_inode->i_mapping->nrpages; } spin_unlock(&bdev_lock); return ret; } void bdput(struct block_device *bdev) { iput(bdev->bd_inode); } EXPORT_SYMBOL(bdput); static struct block_device *bd_acquire(struct inode *inode) { struct block_device *bdev; |
09d967c6f [PATCH] Fix a rac... |
604 |
|
1da177e4c Linux-2.6.12-rc2 |
605 606 |
spin_lock(&bdev_lock); bdev = inode->i_bdev; |
09d967c6f [PATCH] Fix a rac... |
607 |
if (bdev) { |
7de9c6ee3 new helper: ihold() |
608 |
ihold(bdev->bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
609 610 611 612 |
spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
613 |
|
1da177e4c Linux-2.6.12-rc2 |
614 615 616 |
bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
617 618 |
if (!inode->i_bdev) { /* |
7de9c6ee3 new helper: ihold() |
619 |
* We take an additional reference to bd_inode, |
09d967c6f [PATCH] Fix a rac... |
620 621 622 623 |
* and it's released in clear_inode() of inode. * So, we can access it via ->i_mapping always * without igrab(). */ |
7de9c6ee3 new helper: ihold() |
624 |
ihold(bdev->bd_inode); |
09d967c6f [PATCH] Fix a rac... |
625 626 627 628 |
inode->i_bdev = bdev; inode->i_mapping = bdev->bd_inode->i_mapping; list_add(&inode->i_devices, &bdev->bd_inodes); } |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 632 |
spin_unlock(&bdev_lock); } return bdev; } |
a8855990e writeback: Do not... |
633 |
int sb_is_blkdev_sb(struct super_block *sb) |
f47ec3f28 trim fs/internal.h |
634 635 636 |
{ return sb == blockdev_superblock; } |
1da177e4c Linux-2.6.12-rc2 |
637 638 639 640 |
/* Call when you free inode */ void bd_forget(struct inode *inode) { |
09d967c6f [PATCH] Fix a rac... |
641 |
struct block_device *bdev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
642 |
spin_lock(&bdev_lock); |
b4ea2eaa1 fs/block_dev.c: n... |
643 644 645 |
if (!sb_is_blkdev_sb(inode->i_sb)) bdev = inode->i_bdev; __bd_forget(inode); |
1da177e4c Linux-2.6.12-rc2 |
646 |
spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
647 648 649 |
if (bdev) iput(bdev->bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
650 |
} |
1a3cbbc5a block: factor out... |
651 652 653 654 655 656 |
/** * 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... |
657 |
* Test whether @bdev can be claimed by @holder. |
1a3cbbc5a block: factor out... |
658 659 660 661 662 663 664 665 666 |
* * 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 |
667 |
{ |
1da177e4c Linux-2.6.12-rc2 |
668 |
if (bdev->bd_holder == holder) |
1a3cbbc5a block: factor out... |
669 |
return true; /* already a holder */ |
1da177e4c Linux-2.6.12-rc2 |
670 |
else if (bdev->bd_holder != NULL) |
1a3cbbc5a block: factor out... |
671 |
return false; /* held by someone else */ |
1da177e4c Linux-2.6.12-rc2 |
672 |
else if (bdev->bd_contains == bdev) |
1a3cbbc5a block: factor out... |
673 |
return true; /* is a whole device which isn't held */ |
1da177e4c Linux-2.6.12-rc2 |
674 |
|
e525fd89d block: make blkde... |
675 |
else if (whole->bd_holder == bd_may_claim) |
1a3cbbc5a block: factor out... |
676 677 678 |
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 |
679 |
else |
1a3cbbc5a block: factor out... |
680 681 682 683 |
return true; /* is a partition of an un-held device */ } /** |
6b4517a79 block: implement ... |
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 |
* bd_prepare_to_claim - prepare to claim a block device * @bdev: block device of interest * @whole: the whole device containing @bdev, may equal @bdev * @holder: holder trying to claim @bdev * * Prepare to claim @bdev. This function fails if @bdev is already * claimed by another holder and waits if another claiming is in * progress. This function doesn't actually claim. On successful * return, the caller has ownership of bd_claiming and bd_holder[s]. * * CONTEXT: * spin_lock(&bdev_lock). Might release bdev_lock, sleep and regrab * it multiple times. * * RETURNS: * 0 if @bdev can be claimed, -EBUSY otherwise. */ static int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, void *holder) { retry: /* if someone else claimed, fail */ if (!bd_may_claim(bdev, whole, holder)) return -EBUSY; |
e75aa8589 block_dev: always... |
708 709 |
/* if claiming is already in progress, wait for it to finish */ if (whole->bd_claiming) { |
6b4517a79 block: implement ... |
710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 |
wait_queue_head_t *wq = bit_waitqueue(&whole->bd_claiming, 0); DEFINE_WAIT(wait); prepare_to_wait(wq, &wait, TASK_UNINTERRUPTIBLE); spin_unlock(&bdev_lock); schedule(); finish_wait(wq, &wait); spin_lock(&bdev_lock); goto retry; } /* yay, all mine */ return 0; } /** * bd_start_claiming - start claiming a block device * @bdev: block device of interest * @holder: holder trying to claim @bdev * * @bdev is about to be opened exclusively. Check @bdev can be opened * exclusively and mark that an exclusive open is in progress. Each * successful call to this function must be matched with a call to |
b0018361c block: bd_start_c... |
733 734 735 736 737 738 739 |
* either bd_finish_claiming() or bd_abort_claiming() (which do not * fail). * * This function is used to gain exclusive access to the block device * without actually causing other exclusive open attempts to fail. It * should be used when the open sequence itself requires exclusive * access but may subsequently fail. |
6b4517a79 block: implement ... |
740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 |
* * CONTEXT: * Might sleep. * * RETURNS: * Pointer to the block device containing @bdev on success, ERR_PTR() * value on failure. */ static struct block_device *bd_start_claiming(struct block_device *bdev, void *holder) { struct gendisk *disk; struct block_device *whole; int partno, err; might_sleep(); /* * @bdev might not have been initialized properly yet, look up * and grab the outer block device the hard way. */ disk = get_gendisk(bdev->bd_dev, &partno); if (!disk) return ERR_PTR(-ENXIO); |
d4c208b86 block: use the pa... |
764 765 766 767 768 769 770 771 772 773 774 775 |
/* * Normally, @bdev should equal what's returned from bdget_disk() * if partno is 0; however, some drivers (floppy) use multiple * bdev's for the same physical device and @bdev may be one of the * aliases. Keep @bdev if partno is 0. This means claimer * tracking is broken for those devices but it has always been that * way. */ if (partno) whole = bdget_disk(disk, 0); else whole = bdgrab(bdev); |
cf3425707 block: bd_start_c... |
776 |
module_put(disk->fops->owner); |
6b4517a79 block: implement ... |
777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 |
put_disk(disk); if (!whole) return ERR_PTR(-ENOMEM); /* prepare to claim, if successful, mark claiming in progress */ spin_lock(&bdev_lock); err = bd_prepare_to_claim(bdev, whole, holder); if (err == 0) { whole->bd_claiming = holder; spin_unlock(&bdev_lock); return whole; } else { spin_unlock(&bdev_lock); bdput(whole); return ERR_PTR(err); } } |
641dc636b [PATCH] dm/md dep... |
795 |
#ifdef CONFIG_SYSFS |
49731baa4 block: restore mu... |
796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 |
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.... |
812 |
static int add_symlink(struct kobject *from, struct kobject *to) |
641dc636b [PATCH] dm/md dep... |
813 |
{ |
4d7dd8fd9 [PATCH] blockdev.... |
814 |
return sysfs_create_link(from, to, kobject_name(to)); |
641dc636b [PATCH] dm/md dep... |
815 816 817 818 |
} static void del_symlink(struct kobject *from, struct kobject *to) { |
641dc636b [PATCH] dm/md dep... |
819 820 |
sysfs_remove_link(from, kobject_name(to)); } |
641dc636b [PATCH] dm/md dep... |
821 |
/** |
e09b457bd block: simplify h... |
822 823 824 |
* 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 ... |
825 |
* |
49731baa4 block: restore mu... |
826 827 |
* DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * |
e09b457bd block: simplify h... |
828 |
* This functions creates the following sysfs symlinks. |
641dc636b [PATCH] dm/md dep... |
829 |
* |
e09b457bd block: simplify h... |
830 831 |
* - 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... |
832 |
* |
e09b457bd block: simplify h... |
833 834 |
* 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... |
835 |
* |
e09b457bd block: simplify h... |
836 837 |
* /sys/block/dm-0/slaves/sda --> /sys/block/sda * /sys/block/sda/holders/dm-0 --> /sys/block/dm-0 |
641dc636b [PATCH] dm/md dep... |
838 |
* |
e09b457bd block: simplify h... |
839 840 841 |
* 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... |
842 |
* |
e09b457bd block: simplify h... |
843 844 |
* CONTEXT: * Might sleep. |
641dc636b [PATCH] dm/md dep... |
845 |
* |
e09b457bd block: simplify h... |
846 847 |
* RETURNS: * 0 on success, -errno on failure. |
641dc636b [PATCH] dm/md dep... |
848 |
*/ |
e09b457bd block: simplify h... |
849 |
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
850 |
{ |
49731baa4 block: restore mu... |
851 |
struct bd_holder_disk *holder; |
e09b457bd block: simplify h... |
852 |
int ret = 0; |
641dc636b [PATCH] dm/md dep... |
853 |
|
2e7b651df [PATCH] remove th... |
854 |
mutex_lock(&bdev->bd_mutex); |
df6c0cd9a [PATCH] clean up ... |
855 |
|
49731baa4 block: restore mu... |
856 |
WARN_ON_ONCE(!bdev->bd_holder); |
4e91672c7 Replace obscure c... |
857 |
|
e09b457bd block: simplify h... |
858 859 860 |
/* 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... |
861 |
|
49731baa4 block: restore mu... |
862 863 864 |
holder = bd_find_holder_disk(bdev, disk); if (holder) { holder->refcnt++; |
e09b457bd block: simplify h... |
865 |
goto out_unlock; |
49731baa4 block: restore mu... |
866 |
} |
641dc636b [PATCH] dm/md dep... |
867 |
|
49731baa4 block: restore mu... |
868 869 870 |
holder = kzalloc(sizeof(*holder), GFP_KERNEL); if (!holder) { ret = -ENOMEM; |
e09b457bd block: simplify h... |
871 872 |
goto out_unlock; } |
641dc636b [PATCH] dm/md dep... |
873 |
|
49731baa4 block: restore mu... |
874 875 876 877 878 879 880 881 882 883 884 |
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... |
885 886 887 888 889 |
/* * 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... |
890 891 892 893 894 895 896 897 |
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... |
898 |
out_unlock: |
b4cf1b72e [PATCH] dm/md dep... |
899 |
mutex_unlock(&bdev->bd_mutex); |
e09b457bd block: simplify h... |
900 |
return ret; |
641dc636b [PATCH] dm/md dep... |
901 |
} |
e09b457bd block: simplify h... |
902 |
EXPORT_SYMBOL_GPL(bd_link_disk_holder); |
641dc636b [PATCH] dm/md dep... |
903 |
|
49731baa4 block: restore mu... |
904 905 906 907 908 909 910 911 912 913 914 |
/** * 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... |
915 |
{ |
49731baa4 block: restore mu... |
916 |
struct bd_holder_disk *holder; |
641dc636b [PATCH] dm/md dep... |
917 |
|
49731baa4 block: restore mu... |
918 |
mutex_lock(&bdev->bd_mutex); |
641dc636b [PATCH] dm/md dep... |
919 |
|
49731baa4 block: restore mu... |
920 921 922 923 924 925 |
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... |
926 |
kobject_put(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
927 928 929 930 931 |
list_del_init(&holder->list); kfree(holder); } mutex_unlock(&bdev->bd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
932 |
} |
49731baa4 block: restore mu... |
933 |
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); |
641dc636b [PATCH] dm/md dep... |
934 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
935 |
|
0c002c2f7 Wrapper for lower... |
936 |
/** |
56ade44b4 Added flush_disk ... |
937 938 939 |
* flush_disk - invalidates all buffer-cache entries on a disk * * @bdev: struct block device to be flushed |
e6eb5ce1b fs/block_dev.c: f... |
940 |
* @kill_dirty: flag to guide handling of dirty inodes |
56ade44b4 Added flush_disk ... |
941 942 943 944 945 |
* * Invalidates all buffer-cache entries on a disk. It should be called * when a disk has been changed -- either by a media change or online * resize. */ |
93b270f76 Fix over-zealous ... |
946 |
static void flush_disk(struct block_device *bdev, bool kill_dirty) |
56ade44b4 Added flush_disk ... |
947 |
{ |
93b270f76 Fix over-zealous ... |
948 |
if (__invalidate_device(bdev, kill_dirty)) { |
56ade44b4 Added flush_disk ... |
949 950 951 952 953 954 955 956 957 958 959 |
char name[BDEVNAME_SIZE] = ""; if (bdev->bd_disk) disk_name(bdev->bd_disk, 0, name); printk(KERN_WARNING "VFS: busy inodes on changed media or " "resized disk %s ", name); } if (!bdev->bd_disk) return; |
d27769ec3 block: add GENHD_... |
960 |
if (disk_part_scan_enabled(bdev->bd_disk)) |
56ade44b4 Added flush_disk ... |
961 962 963 964 |
bdev->bd_invalidated = 1; } /** |
57d1b5366 block_dev: fix ke... |
965 |
* check_disk_size_change - checks for disk size change and adjusts bdev size. |
c3279d145 Adjust block devi... |
966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 |
* @disk: struct gendisk to check * @bdev: struct bdev to adjust. * * This routine checks to see if the bdev size does not match the disk size * and adjusts it if it differs. */ void check_disk_size_change(struct gendisk *disk, struct block_device *bdev) { loff_t disk_size, bdev_size; disk_size = (loff_t)get_capacity(disk) << 9; bdev_size = i_size_read(bdev->bd_inode); if (disk_size != bdev_size) { char name[BDEVNAME_SIZE]; disk_name(disk, 0, name); printk(KERN_INFO "%s: detected capacity change from %lld to %lld ", name, bdev_size, disk_size); i_size_write(bdev->bd_inode, disk_size); |
93b270f76 Fix over-zealous ... |
987 |
flush_disk(bdev, false); |
c3279d145 Adjust block devi... |
988 989 990 991 992 |
} } EXPORT_SYMBOL(check_disk_size_change); /** |
57d1b5366 block_dev: fix ke... |
993 |
* revalidate_disk - wrapper for lower-level driver's revalidate_disk call-back |
0c002c2f7 Wrapper for lower... |
994 995 996 997 998 999 1000 1001 |
* @disk: struct gendisk to be revalidated * * This routine is a wrapper for lower-level driver's revalidate_disk * call-backs. It is used to do common pre and post operations needed * for all revalidate_disk operations. */ int revalidate_disk(struct gendisk *disk) { |
c3279d145 Adjust block devi... |
1002 |
struct block_device *bdev; |
0c002c2f7 Wrapper for lower... |
1003 1004 1005 1006 |
int ret = 0; if (disk->fops->revalidate_disk) ret = disk->fops->revalidate_disk(disk); |
c3279d145 Adjust block devi... |
1007 1008 1009 1010 1011 1012 |
bdev = bdget_disk(disk, 0); if (!bdev) return ret; mutex_lock(&bdev->bd_mutex); check_disk_size_change(disk, bdev); |
7630b661d fs/block_dev.c: p... |
1013 |
bdev->bd_invalidated = 0; |
c3279d145 Adjust block devi... |
1014 1015 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
0c002c2f7 Wrapper for lower... |
1016 1017 1018 |
return ret; } EXPORT_SYMBOL(revalidate_disk); |
1da177e4c Linux-2.6.12-rc2 |
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 |
/* * This routine checks whether a removable media has been changed, * and invalidates all buffer-cache-entries in that case. This * is a relatively slow routine, so we have to try to minimize using * it. Thus it is called only upon a 'mount' or 'open'. This * is the best way of combining speed and utility, I think. * People changing diskettes in the middle of an operation deserve * to lose :-) */ int check_disk_change(struct block_device *bdev) { struct gendisk *disk = bdev->bd_disk; |
83d5cde47 const: make block... |
1031 |
const struct block_device_operations *bdops = disk->fops; |
77ea887e4 implement in-kern... |
1032 |
unsigned int events; |
1da177e4c Linux-2.6.12-rc2 |
1033 |
|
77ea887e4 implement in-kern... |
1034 1035 1036 |
events = disk_clear_events(disk, DISK_EVENT_MEDIA_CHANGE | DISK_EVENT_EJECT_REQUEST); if (!(events & DISK_EVENT_MEDIA_CHANGE)) |
1da177e4c Linux-2.6.12-rc2 |
1037 |
return 0; |
93b270f76 Fix over-zealous ... |
1038 |
flush_disk(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1039 1040 |
if (bdops->revalidate_disk) bdops->revalidate_disk(bdev->bd_disk); |
1da177e4c Linux-2.6.12-rc2 |
1041 1042 1043 1044 1045 1046 1047 |
return 1; } EXPORT_SYMBOL(check_disk_change); void bd_set_size(struct block_device *bdev, loff_t size) { |
e1defc4ff block: Do away wi... |
1048 |
unsigned bsize = bdev_logical_block_size(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1049 |
|
d646a02a9 block: use i_size... |
1050 1051 1052 |
mutex_lock(&bdev->bd_inode->i_mutex); i_size_write(bdev->bd_inode, size); mutex_unlock(&bdev->bd_inode->i_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1053 1054 1055 1056 1057 1058 1059 1060 1061 |
while (bsize < PAGE_CACHE_SIZE) { if (size & bsize) break; bsize <<= 1; } bdev->bd_block_size = bsize; bdev->bd_inode->i_blkbits = blksize_bits(bsize); } EXPORT_SYMBOL(bd_set_size); |
4385bab12 make blkdev_put()... |
1062 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); |
37be41241 [PATCH] lockdep: ... |
1063 |
|
6d740cd5b [PATCH] lockdep: ... |
1064 1065 1066 1067 1068 1069 |
/* * bd_mutex locking: * * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ |
572c48921 [PATCH] sanitize ... |
1070 |
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) |
1da177e4c Linux-2.6.12-rc2 |
1071 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1072 |
struct gendisk *disk; |
523e1d399 block: make gendi... |
1073 |
struct module *owner; |
7db9cfd38 devscgroup: check... |
1074 |
int ret; |
cf771cb5a block: make varia... |
1075 |
int partno; |
fe6e9c1f2 [PATCH] fix cgrou... |
1076 |
int perm = 0; |
572c48921 [PATCH] sanitize ... |
1077 |
if (mode & FMODE_READ) |
fe6e9c1f2 [PATCH] fix cgrou... |
1078 |
perm |= MAY_READ; |
572c48921 [PATCH] sanitize ... |
1079 |
if (mode & FMODE_WRITE) |
fe6e9c1f2 [PATCH] fix cgrou... |
1080 1081 1082 1083 |
perm |= MAY_WRITE; /* * hooks: /n/, see "layering violations". */ |
b7300b78d blkdev: cgroup wh... |
1084 1085 1086 1087 1088 1089 |
if (!for_part) { ret = devcgroup_inode_permission(bdev->bd_inode, perm); if (ret != 0) { bdput(bdev); return ret; } |
826660203 [PATCH] fix bdev ... |
1090 |
} |
7db9cfd38 devscgroup: check... |
1091 |
|
d3374825c md: make devices ... |
1092 |
restart: |
0762b8bde block: always set... |
1093 |
|
89f97496e block: fix __blkd... |
1094 |
ret = -ENXIO; |
cf771cb5a block: make varia... |
1095 |
disk = get_gendisk(bdev->bd_dev, &partno); |
0762b8bde block: always set... |
1096 |
if (!disk) |
6e9624b8c block: push down ... |
1097 |
goto out; |
523e1d399 block: make gendi... |
1098 |
owner = disk->fops->owner; |
1da177e4c Linux-2.6.12-rc2 |
1099 |
|
69e02c59a block: Don't chec... |
1100 |
disk_block_events(disk); |
6796bf54a [PATCH] lockdep: ... |
1101 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
1da177e4c Linux-2.6.12-rc2 |
1102 1103 |
if (!bdev->bd_openers) { bdev->bd_disk = disk; |
87192a2a4 vfs: cache reques... |
1104 |
bdev->bd_queue = disk->queue; |
1da177e4c Linux-2.6.12-rc2 |
1105 |
bdev->bd_contains = bdev; |
cf771cb5a block: make varia... |
1106 |
if (!partno) { |
1da177e4c Linux-2.6.12-rc2 |
1107 |
struct backing_dev_info *bdi; |
89f97496e block: fix __blkd... |
1108 1109 1110 1111 1112 |
ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) goto out_clear; |
1196f8b81 block: rescan par... |
1113 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1114 |
if (disk->fops->open) { |
572c48921 [PATCH] sanitize ... |
1115 |
ret = disk->fops->open(bdev, mode); |
d3374825c md: make devices ... |
1116 1117 1118 1119 1120 1121 1122 |
if (ret == -ERESTARTSYS) { /* Lost a race with 'disk' being * deleted, try again. * See md.c */ disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
d3374825c md: make devices ... |
1123 |
bdev->bd_disk = NULL; |
87192a2a4 vfs: cache reques... |
1124 |
bdev->bd_queue = NULL; |
d3374825c md: make devices ... |
1125 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1126 |
disk_unblock_events(disk); |
69e02c59a block: Don't chec... |
1127 |
put_disk(disk); |
523e1d399 block: make gendi... |
1128 |
module_put(owner); |
d3374825c md: make devices ... |
1129 1130 |
goto restart; } |
1da177e4c Linux-2.6.12-rc2 |
1131 |
} |
7e69723fe block: move bd_se... |
1132 |
|
de33127d8 block: remove red... |
1133 |
if (!ret) { |
7e69723fe block: move bd_se... |
1134 1135 |
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9); bdi = blk_get_backing_dev_info(bdev); |
7e69723fe block: move bd_se... |
1136 1137 |
bdev_inode_switch_bdi(bdev->bd_inode, bdi); } |
1196f8b81 block: rescan par... |
1138 1139 1140 1141 1142 1143 |
/* * If the device is invalidated, rescan partition * if open succeeded or failed with -ENOMEDIUM. * The latter is necessary to prevent ghost * partitions on a removed medium. */ |
fe316bf2d block: Fix NULL p... |
1144 1145 1146 1147 1148 1149 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(disk, bdev); } |
1196f8b81 block: rescan par... |
1150 1151 |
if (ret) goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1152 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1153 1154 1155 1156 |
struct block_device *whole; whole = bdget_disk(disk, 0); ret = -ENOMEM; if (!whole) |
0762b8bde block: always set... |
1157 |
goto out_clear; |
37be41241 [PATCH] lockdep: ... |
1158 |
BUG_ON(for_part); |
572c48921 [PATCH] sanitize ... |
1159 |
ret = __blkdev_get(whole, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1160 |
if (ret) |
0762b8bde block: always set... |
1161 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1162 |
bdev->bd_contains = whole; |
a5491e0c7 fs: switch bdev i... |
1163 1164 |
bdev_inode_switch_bdi(bdev->bd_inode, whole->bd_inode->i_data.backing_dev_info); |
89f97496e block: fix __blkd... |
1165 |
bdev->bd_part = disk_get_part(disk, partno); |
e71bf0d0e block: fix disk->... |
1166 |
if (!(disk->flags & GENHD_FL_UP) || |
89f97496e block: fix __blkd... |
1167 |
!bdev->bd_part || !bdev->bd_part->nr_sects) { |
1da177e4c Linux-2.6.12-rc2 |
1168 |
ret = -ENXIO; |
0762b8bde block: always set... |
1169 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1170 |
} |
89f97496e block: fix __blkd... |
1171 |
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9); |
1da177e4c Linux-2.6.12-rc2 |
1172 1173 |
} } else { |
1da177e4c Linux-2.6.12-rc2 |
1174 |
if (bdev->bd_contains == bdev) { |
1196f8b81 block: rescan par... |
1175 1176 |
ret = 0; if (bdev->bd_disk->fops->open) |
572c48921 [PATCH] sanitize ... |
1177 |
ret = bdev->bd_disk->fops->open(bdev, mode); |
1196f8b81 block: rescan par... |
1178 |
/* the same as first opener case, read comment there */ |
fe316bf2d block: Fix NULL p... |
1179 1180 1181 1182 1183 1184 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(bdev->bd_disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(bdev->bd_disk, bdev); } |
1196f8b81 block: rescan par... |
1185 1186 |
if (ret) goto out_unlock_bdev; |
1da177e4c Linux-2.6.12-rc2 |
1187 |
} |
69e02c59a block: Don't chec... |
1188 |
/* only one opener holds refs to the module and disk */ |
69e02c59a block: Don't chec... |
1189 |
put_disk(disk); |
523e1d399 block: make gendi... |
1190 |
module_put(owner); |
1da177e4c Linux-2.6.12-rc2 |
1191 1192 |
} bdev->bd_openers++; |
37be41241 [PATCH] lockdep: ... |
1193 1194 |
if (for_part) bdev->bd_part_count++; |
c039e3134 [PATCH] sem2mutex... |
1195 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1196 |
disk_unblock_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
1197 |
return 0; |
0762b8bde block: always set... |
1198 |
out_clear: |
89f97496e block: fix __blkd... |
1199 |
disk_put_part(bdev->bd_part); |
1da177e4c Linux-2.6.12-rc2 |
1200 |
bdev->bd_disk = NULL; |
0762b8bde block: always set... |
1201 |
bdev->bd_part = NULL; |
87192a2a4 vfs: cache reques... |
1202 |
bdev->bd_queue = NULL; |
a5491e0c7 fs: switch bdev i... |
1203 |
bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
1204 |
if (bdev != bdev->bd_contains) |
572c48921 [PATCH] sanitize ... |
1205 |
__blkdev_put(bdev->bd_contains, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1206 |
bdev->bd_contains = NULL; |
0762b8bde block: always set... |
1207 |
out_unlock_bdev: |
c039e3134 [PATCH] sem2mutex... |
1208 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1209 |
disk_unblock_events(disk); |
0762b8bde block: always set... |
1210 |
put_disk(disk); |
523e1d399 block: make gendi... |
1211 |
module_put(owner); |
4345caba3 block: NULL deref... |
1212 |
out: |
0762b8bde block: always set... |
1213 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1214 1215 |
return ret; } |
d4d776299 block: clean up b... |
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 |
/** * blkdev_get - open a block device * @bdev: block_device to open * @mode: FMODE_* mask * @holder: exclusive holder identifier * * Open @bdev with @mode. If @mode includes %FMODE_EXCL, @bdev is * open with exclusive access. Specifying %FMODE_EXCL with %NULL * @holder is invalid. Exclusive opens may nest for the same @holder. * * On success, the reference count of @bdev is unchanged. On failure, * @bdev is put. * * CONTEXT: * Might sleep. * * RETURNS: * 0 on success, -errno on failure. */ |
e525fd89d block: make blkde... |
1235 |
int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
1236 |
{ |
e525fd89d block: make blkde... |
1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 |
struct block_device *whole = NULL; int res; WARN_ON_ONCE((mode & FMODE_EXCL) && !holder); if ((mode & FMODE_EXCL) && holder) { whole = bd_start_claiming(bdev, holder); if (IS_ERR(whole)) { bdput(bdev); return PTR_ERR(whole); } } res = __blkdev_get(bdev, mode, 0); if (whole) { |
d4dc210f6 block: don't bloc... |
1253 |
struct gendisk *disk = whole->bd_disk; |
6a027eff6 block: reorganize... |
1254 |
/* finish claiming */ |
77ea887e4 implement in-kern... |
1255 |
mutex_lock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1256 |
spin_lock(&bdev_lock); |
77ea887e4 implement in-kern... |
1257 |
if (!res) { |
6a027eff6 block: reorganize... |
1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 |
BUG_ON(!bd_may_claim(bdev, whole, holder)); /* * Note that for a whole device bd_holders * will be incremented twice, and bd_holder * will be set to bd_may_claim before being * set to holder */ whole->bd_holders++; whole->bd_holder = bd_may_claim; bdev->bd_holders++; bdev->bd_holder = holder; } /* tell others that we're done */ BUG_ON(whole->bd_claiming != holder); whole->bd_claiming = NULL; wake_up_bit(&whole->bd_claiming, 0); spin_unlock(&bdev_lock); |
77ea887e4 implement in-kern... |
1277 1278 |
/* |
d4dc210f6 block: don't bloc... |
1279 1280 1281 1282 1283 |
* Block event polling for write claims if requested. Any * write holder makes the write_holder state stick until * all are released. This is good enough and tracking * individual writeable reference is too fragile given the * way @mode is used in blkdev_get/put(). |
77ea887e4 implement in-kern... |
1284 |
*/ |
4c49ff3fe block: blkdev_get... |
1285 1286 |
if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder && (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { |
77ea887e4 implement in-kern... |
1287 |
bdev->bd_write_holder = true; |
d4dc210f6 block: don't bloc... |
1288 |
disk_block_events(disk); |
77ea887e4 implement in-kern... |
1289 1290 1291 |
} mutex_unlock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1292 |
bdput(whole); |
e525fd89d block: make blkde... |
1293 1294 1295 |
} return res; |
37be41241 [PATCH] lockdep: ... |
1296 |
} |
1da177e4c Linux-2.6.12-rc2 |
1297 |
EXPORT_SYMBOL(blkdev_get); |
d4d776299 block: clean up b... |
1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 |
/** * 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... |
1328 1329 1330 1331 |
if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } |
d4d776299 block: clean up b... |
1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 |
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 |
1374 1375 1376 |
static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
1377 1378 1379 1380 1381 1382 1383 1384 |
/* * 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; |
572c48921 [PATCH] sanitize ... |
1385 1386 1387 1388 1389 1390 |
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 |
1391 |
bdev = bd_acquire(inode); |
6a2aae06c [PATCH] Fix poten... |
1392 1393 |
if (bdev == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1394 |
|
572c48921 [PATCH] sanitize ... |
1395 |
filp->f_mapping = bdev->bd_inode->i_mapping; |
e525fd89d block: make blkde... |
1396 |
return blkdev_get(bdev, filp->f_mode, filp); |
1da177e4c Linux-2.6.12-rc2 |
1397 |
} |
4385bab12 make blkdev_put()... |
1398 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) |
2e7b651df [PATCH] remove th... |
1399 |
{ |
2e7b651df [PATCH] remove th... |
1400 |
struct gendisk *disk = bdev->bd_disk; |
37be41241 [PATCH] lockdep: ... |
1401 |
struct block_device *victim = NULL; |
2e7b651df [PATCH] remove th... |
1402 |
|
6796bf54a [PATCH] lockdep: ... |
1403 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
37be41241 [PATCH] lockdep: ... |
1404 1405 |
if (for_part) bdev->bd_part_count--; |
2e7b651df [PATCH] remove th... |
1406 |
if (!--bdev->bd_openers) { |
6a027eff6 block: reorganize... |
1407 |
WARN_ON_ONCE(bdev->bd_holders); |
2e7b651df [PATCH] remove th... |
1408 1409 |
sync_blockdev(bdev); kill_bdev(bdev); |
94007751b Avoid dereferenci... |
1410 1411 1412 1413 1414 |
/* ->release can cause the old bdi to disappear, * so must switch it out first */ bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info); |
2e7b651df [PATCH] remove th... |
1415 1416 1417 |
} if (bdev->bd_contains == bdev) { if (disk->fops->release) |
db2a144be block_device_oper... |
1418 |
disk->fops->release(disk, mode); |
2e7b651df [PATCH] remove th... |
1419 1420 1421 |
} if (!bdev->bd_openers) { struct module *owner = disk->fops->owner; |
0762b8bde block: always set... |
1422 1423 |
disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
2e7b651df [PATCH] remove th... |
1424 |
bdev->bd_disk = NULL; |
37be41241 [PATCH] lockdep: ... |
1425 1426 |
if (bdev != bdev->bd_contains) victim = bdev->bd_contains; |
2e7b651df [PATCH] remove th... |
1427 |
bdev->bd_contains = NULL; |
523e1d399 block: make gendi... |
1428 1429 1430 |
put_disk(disk); module_put(owner); |
2e7b651df [PATCH] remove th... |
1431 |
} |
2e7b651df [PATCH] remove th... |
1432 1433 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
37be41241 [PATCH] lockdep: ... |
1434 |
if (victim) |
9a1c35427 [PATCH] pass fmod... |
1435 |
__blkdev_put(victim, mode, 1); |
2e7b651df [PATCH] remove th... |
1436 |
} |
4385bab12 make blkdev_put()... |
1437 |
void blkdev_put(struct block_device *bdev, fmode_t mode) |
37be41241 [PATCH] lockdep: ... |
1438 |
{ |
85ef06d1d block: flush MEDI... |
1439 |
mutex_lock(&bdev->bd_mutex); |
e525fd89d block: make blkde... |
1440 |
if (mode & FMODE_EXCL) { |
6a027eff6 block: reorganize... |
1441 1442 1443 1444 1445 1446 1447 |
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... |
1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 |
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... |
1460 1461 1462 1463 |
/* * If this was the last claim, remove holder link and * unblock evpoll if it was a write holder. */ |
85ef06d1d block: flush MEDI... |
1464 1465 1466 |
if (bdev_free && bdev->bd_write_holder) { disk_unblock_events(bdev->bd_disk); bdev->bd_write_holder = false; |
77ea887e4 implement in-kern... |
1467 |
} |
6936217cc block: Don't chec... |
1468 |
} |
77ea887e4 implement in-kern... |
1469 |
|
85ef06d1d block: flush MEDI... |
1470 1471 1472 1473 1474 1475 1476 1477 |
/* * 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()... |
1478 |
__blkdev_put(bdev, mode, 0); |
37be41241 [PATCH] lockdep: ... |
1479 |
} |
2e7b651df [PATCH] remove th... |
1480 |
EXPORT_SYMBOL(blkdev_put); |
1da177e4c Linux-2.6.12-rc2 |
1481 1482 1483 |
static int blkdev_close(struct inode * inode, struct file * filp) { struct block_device *bdev = I_BDEV(filp->f_mapping->host); |
4385bab12 make blkdev_put()... |
1484 1485 |
blkdev_put(bdev, filp->f_mode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1486 |
} |
bb93e3a52 [PATCH] block: ad... |
1487 |
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1488 |
{ |
56b26add0 [PATCH] kill the ... |
1489 1490 |
struct block_device *bdev = I_BDEV(file->f_mapping->host); fmode_t mode = file->f_mode; |
fd4ce1acd [PATCH 1/2] kill ... |
1491 1492 1493 1494 1495 |
/* * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have * to updated it before every ioctl. */ |
56b26add0 [PATCH] kill the ... |
1496 |
if (file->f_flags & O_NDELAY) |
fd4ce1acd [PATCH 1/2] kill ... |
1497 1498 1499 |
mode |= FMODE_NDELAY; else mode &= ~FMODE_NDELAY; |
56b26add0 [PATCH] kill the ... |
1500 |
return blkdev_ioctl(bdev, mode, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1501 |
} |
87d8fe1ee add releasepage h... |
1502 |
/* |
eef993806 vfs: Rename gener... |
1503 1504 1505 1506 1507 1508 |
* 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(... |
1509 |
ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) |
eef993806 vfs: Rename gener... |
1510 1511 |
{ struct file *file = iocb->ki_filp; |
53362a05a fs/block-dev.c:fi... |
1512 |
struct blk_plug plug; |
eef993806 vfs: Rename gener... |
1513 |
ssize_t ret; |
53362a05a fs/block-dev.c:fi... |
1514 |
blk_start_plug(&plug); |
1456c0a87 blkdev_aio_write(... |
1515 |
ret = __generic_file_write_iter(iocb, from); |
02afc27fa direct-io: Handle... |
1516 |
if (ret > 0) { |
eef993806 vfs: Rename gener... |
1517 |
ssize_t err; |
1456c0a87 blkdev_aio_write(... |
1518 |
err = generic_write_sync(file, iocb->ki_pos - ret, ret); |
45d4f8550 fs/direct-io.c: r... |
1519 |
if (err < 0) |
eef993806 vfs: Rename gener... |
1520 1521 |
ret = err; } |
53362a05a fs/block-dev.c:fi... |
1522 |
blk_finish_plug(&plug); |
eef993806 vfs: Rename gener... |
1523 1524 |
return ret; } |
1456c0a87 blkdev_aio_write(... |
1525 |
EXPORT_SYMBOL_GPL(blkdev_write_iter); |
eef993806 vfs: Rename gener... |
1526 |
|
b2de525f0 Return short read... |
1527 |
ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
684c9aaeb vfs: fix O_DIRECT... |
1528 1529 1530 1531 |
{ struct file *file = iocb->ki_filp; struct inode *bd_inode = file->f_mapping->host; loff_t size = i_size_read(bd_inode); |
a886038ba fs/block_dev.c: s... |
1532 |
loff_t pos = iocb->ki_pos; |
684c9aaeb vfs: fix O_DIRECT... |
1533 1534 1535 1536 1537 |
if (pos >= size) return 0; size -= pos; |
a886038ba fs/block_dev.c: s... |
1538 1539 |
iov_iter_truncate(to, size); return generic_file_read_iter(iocb, to); |
684c9aaeb vfs: fix O_DIRECT... |
1540 |
} |
b2de525f0 Return short read... |
1541 |
EXPORT_SYMBOL_GPL(blkdev_read_iter); |
684c9aaeb vfs: fix O_DIRECT... |
1542 |
|
eef993806 vfs: Rename gener... |
1543 |
/* |
87d8fe1ee add releasepage h... |
1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 |
* 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); } |
4c54ac62d make struct def_b... |
1556 |
static const struct address_space_operations def_blk_aops = { |
1da177e4c Linux-2.6.12-rc2 |
1557 |
.readpage = blkdev_readpage, |
447f05bb4 block_dev: implem... |
1558 |
.readpages = blkdev_readpages, |
1da177e4c Linux-2.6.12-rc2 |
1559 |
.writepage = blkdev_writepage, |
6272b5a58 block_dev: conver... |
1560 1561 |
.write_begin = blkdev_write_begin, .write_end = blkdev_write_end, |
1da177e4c Linux-2.6.12-rc2 |
1562 |
.writepages = generic_writepages, |
87d8fe1ee add releasepage h... |
1563 |
.releasepage = blkdev_releasepage, |
1da177e4c Linux-2.6.12-rc2 |
1564 |
.direct_IO = blkdev_direct_IO, |
b45972265 mm: vmscan: take ... |
1565 |
.is_dirty_writeback = buffer_check_dirty_writeback, |
1da177e4c Linux-2.6.12-rc2 |
1566 |
}; |
4b6f5d20b [PATCH] Make most... |
1567 |
const struct file_operations def_blk_fops = { |
1da177e4c Linux-2.6.12-rc2 |
1568 1569 1570 |
.open = blkdev_open, .release = blkdev_close, .llseek = block_llseek, |
a886038ba fs/block_dev.c: s... |
1571 |
.read = new_sync_read, |
1456c0a87 blkdev_aio_write(... |
1572 |
.write = new_sync_write, |
a886038ba fs/block_dev.c: s... |
1573 |
.read_iter = blkdev_read_iter, |
1456c0a87 blkdev_aio_write(... |
1574 |
.write_iter = blkdev_write_iter, |
1e8b33328 blockdev: remove ... |
1575 |
.mmap = generic_file_mmap, |
b1dd3b284 vfs: rename block... |
1576 |
.fsync = blkdev_fsync, |
bb93e3a52 [PATCH] block: ad... |
1577 |
.unlocked_ioctl = block_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
1578 1579 1580 |
#ifdef CONFIG_COMPAT .compat_ioctl = compat_blkdev_ioctl, #endif |
1e8b33328 blockdev: remove ... |
1581 |
.splice_read = generic_file_splice_read, |
8d0207652 ->splice_write() ... |
1582 |
.splice_write = iter_file_splice_write, |
1da177e4c Linux-2.6.12-rc2 |
1583 1584 1585 1586 1587 1588 1589 |
}; int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg) { int res; mm_segment_t old_fs = get_fs(); set_fs(KERNEL_DS); |
56b26add0 [PATCH] kill the ... |
1590 |
res = blkdev_ioctl(bdev, 0, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1591 1592 1593 1594 1595 1596 1597 1598 |
set_fs(old_fs); return res; } EXPORT_SYMBOL(ioctl_by_bdev); /** * lookup_bdev - lookup a struct block_device by name |
94e2959e7 fs: fix function ... |
1599 |
* @pathname: special file representing the block device |
1da177e4c Linux-2.6.12-rc2 |
1600 |
* |
57d1b5366 block_dev: fix ke... |
1601 |
* Get a reference to the blockdevice at @pathname in the current |
1da177e4c Linux-2.6.12-rc2 |
1602 1603 1604 |
* namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ |
421748ecd [PATCH] assorted ... |
1605 |
struct block_device *lookup_bdev(const char *pathname) |
1da177e4c Linux-2.6.12-rc2 |
1606 1607 1608 |
{ struct block_device *bdev; struct inode *inode; |
421748ecd [PATCH] assorted ... |
1609 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
1610 |
int error; |
421748ecd [PATCH] assorted ... |
1611 |
if (!pathname || !*pathname) |
1da177e4c Linux-2.6.12-rc2 |
1612 |
return ERR_PTR(-EINVAL); |
421748ecd [PATCH] assorted ... |
1613 |
error = kern_path(pathname, LOOKUP_FOLLOW, &path); |
1da177e4c Linux-2.6.12-rc2 |
1614 1615 |
if (error) return ERR_PTR(error); |
421748ecd [PATCH] assorted ... |
1616 |
inode = path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1617 1618 1619 1620 |
error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) goto fail; error = -EACCES; |
421748ecd [PATCH] assorted ... |
1621 |
if (path.mnt->mnt_flags & MNT_NODEV) |
1da177e4c Linux-2.6.12-rc2 |
1622 1623 1624 1625 1626 1627 |
goto fail; error = -ENOMEM; bdev = bd_acquire(inode); if (!bdev) goto fail; out: |
421748ecd [PATCH] assorted ... |
1628 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
1629 1630 1631 1632 1633 |
return bdev; fail: bdev = ERR_PTR(error); goto out; } |
d5686b444 [PATCH] switch mt... |
1634 |
EXPORT_SYMBOL(lookup_bdev); |
1da177e4c Linux-2.6.12-rc2 |
1635 |
|
93b270f76 Fix over-zealous ... |
1636 |
int __invalidate_device(struct block_device *bdev, bool kill_dirty) |
b71e8a4ce [PATCH] BLOCK: Mo... |
1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 |
{ 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 ... |
1649 |
res = invalidate_inodes(sb, kill_dirty); |
b71e8a4ce [PATCH] BLOCK: Mo... |
1650 1651 |
drop_super(sb); } |
f98393a64 mm: remove destro... |
1652 |
invalidate_bdev(bdev); |
b71e8a4ce [PATCH] BLOCK: Mo... |
1653 1654 1655 |
return res; } EXPORT_SYMBOL(__invalidate_device); |
5c0d6b60a vfs: Create funct... |
1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 |
void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) { struct inode *inode, *old_inode = NULL; spin_lock(&inode_sb_list_lock); list_for_each_entry(inode, &blockdev_superblock->s_inodes, i_sb_list) { struct address_space *mapping = inode->i_mapping; 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); spin_unlock(&inode_sb_list_lock); /* * We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the * inode_sb_list_lock. We cannot iput the inode now as we can * be holding the last reference and we cannot iput it under * inode_sb_list_lock. So we keep the reference and iput it * later. */ iput(old_inode); old_inode = inode; func(I_BDEV(inode), arg); spin_lock(&inode_sb_list_lock); } spin_unlock(&inode_sb_list_lock); iput(old_inode); } |