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fs/block_dev.c
40.3 KB
1da177e4c Linux-2.6.12-rc2 |
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/* * linux/fs/block_dev.c * * Copyright (C) 1991, 1992 Linus Torvalds * Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE */ |
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#include <linux/init.h> #include <linux/mm.h> #include <linux/fcntl.h> #include <linux/slab.h> #include <linux/kmod.h> #include <linux/major.h> |
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#include <linux/device_cgroup.h> |
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#include <linux/highmem.h> #include <linux/blkdev.h> #include <linux/module.h> #include <linux/blkpg.h> #include <linux/buffer_head.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/kmemleak.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; } EXPORT_SYMBOL(I_BDEV); |
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/* * move the inode from it's current bdi to the a new bdi. if the inode is dirty * we need to move it onto the dirty list of @dst so that the inode is always * on the right list. */ static void bdev_inode_switch_bdi(struct inode *inode, struct backing_dev_info *dst) { |
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spin_lock(&inode_wb_list_lock); |
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spin_lock(&inode->i_lock); |
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inode->i_data.backing_dev_info = dst; if (inode->i_state & I_DIRTY) |
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list_move(&inode->i_wb_list, &dst->wb.b_dirty); |
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spin_unlock(&inode->i_lock); |
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spin_unlock(&inode_wb_list_lock); |
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} |
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static sector_t max_block(struct block_device *bdev) { sector_t retval = ~((sector_t)0); loff_t sz = i_size_read(bdev->bd_inode); if (sz) { unsigned int size = block_size(bdev); unsigned int sizebits = blksize_bits(size); retval = (sz >> sizebits); } return retval; } |
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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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if (bdev->bd_inode->i_mapping->nrpages == 0) return; invalidate_bh_lrus(); |
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truncate_inode_pages(bdev->bd_inode->i_mapping, 0); } 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) { if (iblock >= max_block(I_BDEV(inode))) { if (create) return -EIO; /* * for reads, we're just trying to fill a partial page. * return a hole, they will have to call get_block again * before they can fill it, and they will get -EIO at that * time */ return 0; } bh->b_bdev = I_BDEV(inode); bh->b_blocknr = iblock; set_buffer_mapped(bh); return 0; } |
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static int blkdev_get_blocks(struct inode *inode, sector_t iblock, struct buffer_head *bh, int create) { sector_t end_block = max_block(I_BDEV(inode)); unsigned long max_blocks = bh->b_size >> inode->i_blkbits; if ((iblock + max_blocks) > end_block) { max_blocks = end_block - iblock; if ((long)max_blocks <= 0) { if (create) return -EIO; /* write fully beyond EOF */ /* * It is a read which is fully beyond EOF. We return * a !buffer_mapped buffer */ max_blocks = 0; } } bh->b_bdev = I_BDEV(inode); bh->b_blocknr = iblock; bh->b_size = max_blocks << inode->i_blkbits; if (max_blocks) set_buffer_mapped(bh); return 0; } static ssize_t blkdev_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) { 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), iov, offset, nr_segs, blkdev_get_blocks, 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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error = freeze_super(sb); 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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error = thaw_super(sb); 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_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->f_path.dentry->d_inode->i_size is zero |
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* so we compute the size by hand (just as in block_read/write above) */ static loff_t block_llseek(struct file *file, loff_t offset, int origin) { struct inode *bd_inode = file->f_mapping->host; loff_t size; loff_t retval; |
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mutex_lock(&bd_inode->i_mutex); |
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size = i_size_read(bd_inode); switch (origin) { case 2: offset += size; break; case 1: offset += file->f_pos; } retval = -EINVAL; if (offset >= 0 && offset <= size) { if (offset != file->f_pos) { file->f_pos = offset; } retval = offset; } |
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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, 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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/* * 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. */ mutex_unlock(&bd_inode->i_mutex); |
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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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mutex_lock(&bd_inode->i_mutex); |
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return error; |
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} |
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EXPORT_SYMBOL(blkdev_fsync); |
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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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INIT_LIST_HEAD(&inode->i_dentry); |
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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(&inode->i_data, 0); invalidate_inode_buffers(inode); /* is it needed here? */ end_writeback(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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}; |
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static struct dentry *bd_mount(struct file_system_type *fs_type, int flags, const char *dev_name, void *data) |
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{ |
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return mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, 0x62646576); |
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} static struct file_system_type bd_type = { .name = "bdev", |
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.mount = bd_mount, |
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.kill_sb = kill_anon_super, }; |
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struct super_block *blockdev_superblock __read_mostly; |
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void __init bdev_cache_init(void) { int err; |
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struct vfsmount *bd_mnt; |
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bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), |
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0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD|SLAB_PANIC), |
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init_once); |
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err = register_filesystem(&bd_type); if (err) panic("Cannot register bdev pseudo-fs"); bd_mnt = kern_mount(&bd_type); |
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if (IS_ERR(bd_mnt)) panic("Cannot create bdev pseudo-fs"); |
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/* * This vfsmount structure is only used to obtain the * blockdev_superblock, so tell kmemleak not to report it. */ kmemleak_not_leak(bd_mnt); |
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blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ } /* * 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; |
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inode = iget5_locked(blockdev_superblock, hash(dev), |
1da177e4c Linux-2.6.12-rc2 |
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 |
bdev_test, bdev_set, &dev); if (!inode) return NULL; bdev = &BDEV_I(inode)->bdev; if (inode->i_state & I_NEW) { bdev->bd_contains = NULL; 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... |
541 542 543 544 545 546 |
/** * 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() |
547 |
ihold(bdev->bd_inode); |
dddac6a7b PM / Hibernate: R... |
548 549 |
return bdev; } |
1da177e4c Linux-2.6.12-rc2 |
550 551 |
long nr_blockdev_pages(void) { |
203a2935c fs/block_dev.c: u... |
552 |
struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
553 554 |
long ret = 0; spin_lock(&bdev_lock); |
203a2935c fs/block_dev.c: u... |
555 |
list_for_each_entry(bdev, &all_bdevs, bd_list) { |
1da177e4c Linux-2.6.12-rc2 |
556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 |
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... |
572 |
|
1da177e4c Linux-2.6.12-rc2 |
573 574 |
spin_lock(&bdev_lock); bdev = inode->i_bdev; |
09d967c6f [PATCH] Fix a rac... |
575 |
if (bdev) { |
7de9c6ee3 new helper: ihold() |
576 |
ihold(bdev->bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
577 578 579 580 |
spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
581 |
|
1da177e4c Linux-2.6.12-rc2 |
582 583 584 |
bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
585 586 |
if (!inode->i_bdev) { /* |
7de9c6ee3 new helper: ihold() |
587 |
* We take an additional reference to bd_inode, |
09d967c6f [PATCH] Fix a rac... |
588 589 590 591 |
* and it's released in clear_inode() of inode. * So, we can access it via ->i_mapping always * without igrab(). */ |
7de9c6ee3 new helper: ihold() |
592 |
ihold(bdev->bd_inode); |
09d967c6f [PATCH] Fix a rac... |
593 594 595 596 |
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 |
597 598 599 600 601 602 603 604 605 |
spin_unlock(&bdev_lock); } return bdev; } /* Call when you free inode */ void bd_forget(struct inode *inode) { |
09d967c6f [PATCH] Fix a rac... |
606 |
struct block_device *bdev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
607 |
spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
608 |
if (inode->i_bdev) { |
c2acf7b90 fs/block_dev.c: _... |
609 |
if (!sb_is_blkdev_sb(inode->i_sb)) |
09d967c6f [PATCH] Fix a rac... |
610 |
bdev = inode->i_bdev; |
1da177e4c Linux-2.6.12-rc2 |
611 |
__bd_forget(inode); |
09d967c6f [PATCH] Fix a rac... |
612 |
} |
1da177e4c Linux-2.6.12-rc2 |
613 |
spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
614 615 616 |
if (bdev) iput(bdev->bd_inode); |
1da177e4c Linux-2.6.12-rc2 |
617 |
} |
1a3cbbc5a block: factor out... |
618 619 620 621 622 623 |
/** * 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... |
624 |
* Test whether @bdev can be claimed by @holder. |
1a3cbbc5a block: factor out... |
625 626 627 628 629 630 631 632 633 |
* * 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 |
634 |
{ |
1da177e4c Linux-2.6.12-rc2 |
635 |
if (bdev->bd_holder == holder) |
1a3cbbc5a block: factor out... |
636 |
return true; /* already a holder */ |
1da177e4c Linux-2.6.12-rc2 |
637 |
else if (bdev->bd_holder != NULL) |
1a3cbbc5a block: factor out... |
638 |
return false; /* held by someone else */ |
1da177e4c Linux-2.6.12-rc2 |
639 |
else if (bdev->bd_contains == bdev) |
1a3cbbc5a block: factor out... |
640 |
return true; /* is a whole device which isn't held */ |
1da177e4c Linux-2.6.12-rc2 |
641 |
|
e525fd89d block: make blkde... |
642 |
else if (whole->bd_holder == bd_may_claim) |
1a3cbbc5a block: factor out... |
643 644 645 |
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 |
646 |
else |
1a3cbbc5a block: factor out... |
647 648 649 650 |
return true; /* is a partition of an un-held device */ } /** |
6b4517a79 block: implement ... |
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 |
* 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... |
675 676 |
/* if claiming is already in progress, wait for it to finish */ if (whole->bd_claiming) { |
6b4517a79 block: implement ... |
677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 |
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... |
700 701 702 703 704 705 706 |
* 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 ... |
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 |
* * 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... |
731 732 733 734 735 736 737 738 739 740 741 742 |
/* * 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... |
743 |
module_put(disk->fops->owner); |
6b4517a79 block: implement ... |
744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 |
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... |
762 |
#ifdef CONFIG_SYSFS |
49731baa4 block: restore mu... |
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 |
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.... |
779 |
static int add_symlink(struct kobject *from, struct kobject *to) |
641dc636b [PATCH] dm/md dep... |
780 |
{ |
4d7dd8fd9 [PATCH] blockdev.... |
781 |
return sysfs_create_link(from, to, kobject_name(to)); |
641dc636b [PATCH] dm/md dep... |
782 783 784 785 |
} static void del_symlink(struct kobject *from, struct kobject *to) { |
641dc636b [PATCH] dm/md dep... |
786 787 |
sysfs_remove_link(from, kobject_name(to)); } |
641dc636b [PATCH] dm/md dep... |
788 |
/** |
e09b457bd block: simplify h... |
789 790 791 |
* 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 ... |
792 |
* |
49731baa4 block: restore mu... |
793 794 |
* DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * |
e09b457bd block: simplify h... |
795 |
* This functions creates the following sysfs symlinks. |
641dc636b [PATCH] dm/md dep... |
796 |
* |
e09b457bd block: simplify h... |
797 798 |
* - 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... |
799 |
* |
e09b457bd block: simplify h... |
800 801 |
* 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... |
802 |
* |
e09b457bd block: simplify h... |
803 804 |
* /sys/block/dm-0/slaves/sda --> /sys/block/sda * /sys/block/sda/holders/dm-0 --> /sys/block/dm-0 |
641dc636b [PATCH] dm/md dep... |
805 |
* |
e09b457bd block: simplify h... |
806 807 808 |
* 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... |
809 |
* |
e09b457bd block: simplify h... |
810 811 |
* CONTEXT: * Might sleep. |
641dc636b [PATCH] dm/md dep... |
812 |
* |
e09b457bd block: simplify h... |
813 814 |
* RETURNS: * 0 on success, -errno on failure. |
641dc636b [PATCH] dm/md dep... |
815 |
*/ |
e09b457bd block: simplify h... |
816 |
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
817 |
{ |
49731baa4 block: restore mu... |
818 |
struct bd_holder_disk *holder; |
e09b457bd block: simplify h... |
819 |
int ret = 0; |
641dc636b [PATCH] dm/md dep... |
820 |
|
2e7b651df [PATCH] remove th... |
821 |
mutex_lock(&bdev->bd_mutex); |
df6c0cd9a [PATCH] clean up ... |
822 |
|
49731baa4 block: restore mu... |
823 |
WARN_ON_ONCE(!bdev->bd_holder); |
4e91672c7 Replace obscure c... |
824 |
|
e09b457bd block: simplify h... |
825 826 827 |
/* 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... |
828 |
|
49731baa4 block: restore mu... |
829 830 831 |
holder = bd_find_holder_disk(bdev, disk); if (holder) { holder->refcnt++; |
e09b457bd block: simplify h... |
832 |
goto out_unlock; |
49731baa4 block: restore mu... |
833 |
} |
641dc636b [PATCH] dm/md dep... |
834 |
|
49731baa4 block: restore mu... |
835 836 837 |
holder = kzalloc(sizeof(*holder), GFP_KERNEL); if (!holder) { ret = -ENOMEM; |
e09b457bd block: simplify h... |
838 839 |
goto out_unlock; } |
641dc636b [PATCH] dm/md dep... |
840 |
|
49731baa4 block: restore mu... |
841 842 843 844 845 846 847 848 849 850 851 |
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... |
852 853 854 855 856 |
/* * 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... |
857 858 859 860 861 862 863 864 |
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... |
865 |
out_unlock: |
b4cf1b72e [PATCH] dm/md dep... |
866 |
mutex_unlock(&bdev->bd_mutex); |
e09b457bd block: simplify h... |
867 |
return ret; |
641dc636b [PATCH] dm/md dep... |
868 |
} |
e09b457bd block: simplify h... |
869 |
EXPORT_SYMBOL_GPL(bd_link_disk_holder); |
641dc636b [PATCH] dm/md dep... |
870 |
|
49731baa4 block: restore mu... |
871 872 873 874 875 876 877 878 879 880 881 |
/** * 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... |
882 |
{ |
49731baa4 block: restore mu... |
883 |
struct bd_holder_disk *holder; |
641dc636b [PATCH] dm/md dep... |
884 |
|
49731baa4 block: restore mu... |
885 |
mutex_lock(&bdev->bd_mutex); |
641dc636b [PATCH] dm/md dep... |
886 |
|
49731baa4 block: restore mu... |
887 888 889 890 891 892 |
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... |
893 |
kobject_put(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
894 895 896 897 898 |
list_del_init(&holder->list); kfree(holder); } mutex_unlock(&bdev->bd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
899 |
} |
49731baa4 block: restore mu... |
900 |
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); |
641dc636b [PATCH] dm/md dep... |
901 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
902 |
|
0c002c2f7 Wrapper for lower... |
903 |
/** |
56ade44b4 Added flush_disk ... |
904 905 906 |
* flush_disk - invalidates all buffer-cache entries on a disk * * @bdev: struct block device to be flushed |
e6eb5ce1b fs/block_dev.c: f... |
907 |
* @kill_dirty: flag to guide handling of dirty inodes |
56ade44b4 Added flush_disk ... |
908 909 910 911 912 |
* * 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 ... |
913 |
static void flush_disk(struct block_device *bdev, bool kill_dirty) |
56ade44b4 Added flush_disk ... |
914 |
{ |
93b270f76 Fix over-zealous ... |
915 |
if (__invalidate_device(bdev, kill_dirty)) { |
56ade44b4 Added flush_disk ... |
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 |
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; if (disk_partitionable(bdev->bd_disk)) bdev->bd_invalidated = 1; } /** |
57d1b5366 block_dev: fix ke... |
932 |
* check_disk_size_change - checks for disk size change and adjusts bdev size. |
c3279d145 Adjust block devi... |
933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 |
* @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 ... |
954 |
flush_disk(bdev, false); |
c3279d145 Adjust block devi... |
955 956 957 958 959 |
} } EXPORT_SYMBOL(check_disk_size_change); /** |
57d1b5366 block_dev: fix ke... |
960 |
* revalidate_disk - wrapper for lower-level driver's revalidate_disk call-back |
0c002c2f7 Wrapper for lower... |
961 962 963 964 965 966 967 968 |
* @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... |
969 |
struct block_device *bdev; |
0c002c2f7 Wrapper for lower... |
970 971 972 973 |
int ret = 0; if (disk->fops->revalidate_disk) ret = disk->fops->revalidate_disk(disk); |
c3279d145 Adjust block devi... |
974 975 976 977 978 979 980 981 |
bdev = bdget_disk(disk, 0); if (!bdev) return ret; mutex_lock(&bdev->bd_mutex); check_disk_size_change(disk, bdev); mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
0c002c2f7 Wrapper for lower... |
982 983 984 |
return ret; } EXPORT_SYMBOL(revalidate_disk); |
1da177e4c Linux-2.6.12-rc2 |
985 986 987 988 989 990 991 992 993 994 995 996 |
/* * 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... |
997 |
const struct block_device_operations *bdops = disk->fops; |
77ea887e4 implement in-kern... |
998 |
unsigned int events; |
1da177e4c Linux-2.6.12-rc2 |
999 |
|
77ea887e4 implement in-kern... |
1000 1001 1002 |
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 |
1003 |
return 0; |
93b270f76 Fix over-zealous ... |
1004 |
flush_disk(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1005 1006 |
if (bdops->revalidate_disk) bdops->revalidate_disk(bdev->bd_disk); |
1da177e4c Linux-2.6.12-rc2 |
1007 1008 1009 1010 1011 1012 1013 |
return 1; } EXPORT_SYMBOL(check_disk_change); void bd_set_size(struct block_device *bdev, loff_t size) { |
e1defc4ff block: Do away wi... |
1014 |
unsigned bsize = bdev_logical_block_size(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 |
bdev->bd_inode->i_size = size; 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); |
9a1c35427 [PATCH] pass fmod... |
1026 |
static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); |
37be41241 [PATCH] lockdep: ... |
1027 |
|
6d740cd5b [PATCH] lockdep: ... |
1028 1029 1030 1031 1032 1033 |
/* * bd_mutex locking: * * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ |
572c48921 [PATCH] sanitize ... |
1034 |
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) |
1da177e4c Linux-2.6.12-rc2 |
1035 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1036 |
struct gendisk *disk; |
7db9cfd38 devscgroup: check... |
1037 |
int ret; |
cf771cb5a block: make varia... |
1038 |
int partno; |
fe6e9c1f2 [PATCH] fix cgrou... |
1039 |
int perm = 0; |
572c48921 [PATCH] sanitize ... |
1040 |
if (mode & FMODE_READ) |
fe6e9c1f2 [PATCH] fix cgrou... |
1041 |
perm |= MAY_READ; |
572c48921 [PATCH] sanitize ... |
1042 |
if (mode & FMODE_WRITE) |
fe6e9c1f2 [PATCH] fix cgrou... |
1043 1044 1045 1046 |
perm |= MAY_WRITE; /* * hooks: /n/, see "layering violations". */ |
b7300b78d blkdev: cgroup wh... |
1047 1048 1049 1050 1051 1052 |
if (!for_part) { ret = devcgroup_inode_permission(bdev->bd_inode, perm); if (ret != 0) { bdput(bdev); return ret; } |
826660203 [PATCH] fix bdev ... |
1053 |
} |
7db9cfd38 devscgroup: check... |
1054 |
|
d3374825c md: make devices ... |
1055 |
restart: |
0762b8bde block: always set... |
1056 |
|
89f97496e block: fix __blkd... |
1057 |
ret = -ENXIO; |
cf771cb5a block: make varia... |
1058 |
disk = get_gendisk(bdev->bd_dev, &partno); |
0762b8bde block: always set... |
1059 |
if (!disk) |
6e9624b8c block: push down ... |
1060 |
goto out; |
1da177e4c Linux-2.6.12-rc2 |
1061 |
|
69e02c59a block: Don't chec... |
1062 |
disk_block_events(disk); |
6796bf54a [PATCH] lockdep: ... |
1063 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
1da177e4c Linux-2.6.12-rc2 |
1064 1065 1066 |
if (!bdev->bd_openers) { bdev->bd_disk = disk; bdev->bd_contains = bdev; |
cf771cb5a block: make varia... |
1067 |
if (!partno) { |
1da177e4c Linux-2.6.12-rc2 |
1068 |
struct backing_dev_info *bdi; |
89f97496e block: fix __blkd... |
1069 1070 1071 1072 1073 |
ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) goto out_clear; |
1196f8b81 block: rescan par... |
1074 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1075 |
if (disk->fops->open) { |
572c48921 [PATCH] sanitize ... |
1076 |
ret = disk->fops->open(bdev, mode); |
d3374825c md: make devices ... |
1077 1078 1079 1080 1081 1082 1083 |
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 ... |
1084 1085 |
bdev->bd_disk = NULL; mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1086 1087 1088 |
disk_unblock_events(disk); module_put(disk->fops->owner); put_disk(disk); |
d3374825c md: make devices ... |
1089 1090 |
goto restart; } |
1da177e4c Linux-2.6.12-rc2 |
1091 |
} |
7e69723fe block: move bd_se... |
1092 1093 1094 1095 1096 1097 1098 1099 |
if (!ret && !bdev->bd_openers) { bd_set_size(bdev,(loff_t)get_capacity(disk)<<9); bdi = blk_get_backing_dev_info(bdev); if (bdi == NULL) bdi = &default_backing_dev_info; bdev_inode_switch_bdi(bdev->bd_inode, bdi); } |
1196f8b81 block: rescan par... |
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 |
/* * 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. */ if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM)) rescan_partitions(disk, bdev); if (ret) goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1110 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1111 1112 1113 1114 |
struct block_device *whole; whole = bdget_disk(disk, 0); ret = -ENOMEM; if (!whole) |
0762b8bde block: always set... |
1115 |
goto out_clear; |
37be41241 [PATCH] lockdep: ... |
1116 |
BUG_ON(for_part); |
572c48921 [PATCH] sanitize ... |
1117 |
ret = __blkdev_get(whole, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1118 |
if (ret) |
0762b8bde block: always set... |
1119 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1120 |
bdev->bd_contains = whole; |
a5491e0c7 fs: switch bdev i... |
1121 1122 |
bdev_inode_switch_bdi(bdev->bd_inode, whole->bd_inode->i_data.backing_dev_info); |
89f97496e block: fix __blkd... |
1123 |
bdev->bd_part = disk_get_part(disk, partno); |
e71bf0d0e block: fix disk->... |
1124 |
if (!(disk->flags & GENHD_FL_UP) || |
89f97496e block: fix __blkd... |
1125 |
!bdev->bd_part || !bdev->bd_part->nr_sects) { |
1da177e4c Linux-2.6.12-rc2 |
1126 |
ret = -ENXIO; |
0762b8bde block: always set... |
1127 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1128 |
} |
89f97496e block: fix __blkd... |
1129 |
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9); |
1da177e4c Linux-2.6.12-rc2 |
1130 1131 |
} } else { |
1da177e4c Linux-2.6.12-rc2 |
1132 |
if (bdev->bd_contains == bdev) { |
1196f8b81 block: rescan par... |
1133 1134 |
ret = 0; if (bdev->bd_disk->fops->open) |
572c48921 [PATCH] sanitize ... |
1135 |
ret = bdev->bd_disk->fops->open(bdev, mode); |
1196f8b81 block: rescan par... |
1136 1137 |
/* the same as first opener case, read comment there */ if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM)) |
1da177e4c Linux-2.6.12-rc2 |
1138 |
rescan_partitions(bdev->bd_disk, bdev); |
1196f8b81 block: rescan par... |
1139 1140 |
if (ret) goto out_unlock_bdev; |
1da177e4c Linux-2.6.12-rc2 |
1141 |
} |
69e02c59a block: Don't chec... |
1142 1143 1144 |
/* only one opener holds refs to the module and disk */ module_put(disk->fops->owner); put_disk(disk); |
1da177e4c Linux-2.6.12-rc2 |
1145 1146 |
} bdev->bd_openers++; |
37be41241 [PATCH] lockdep: ... |
1147 1148 |
if (for_part) bdev->bd_part_count++; |
c039e3134 [PATCH] sem2mutex... |
1149 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1150 |
disk_unblock_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
1151 |
return 0; |
0762b8bde block: always set... |
1152 |
out_clear: |
89f97496e block: fix __blkd... |
1153 |
disk_put_part(bdev->bd_part); |
1da177e4c Linux-2.6.12-rc2 |
1154 |
bdev->bd_disk = NULL; |
0762b8bde block: always set... |
1155 |
bdev->bd_part = NULL; |
a5491e0c7 fs: switch bdev i... |
1156 |
bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info); |
1da177e4c Linux-2.6.12-rc2 |
1157 |
if (bdev != bdev->bd_contains) |
572c48921 [PATCH] sanitize ... |
1158 |
__blkdev_put(bdev->bd_contains, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1159 |
bdev->bd_contains = NULL; |
0762b8bde block: always set... |
1160 |
out_unlock_bdev: |
c039e3134 [PATCH] sem2mutex... |
1161 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1162 |
disk_unblock_events(disk); |
69e02c59a block: Don't chec... |
1163 |
module_put(disk->fops->owner); |
0762b8bde block: always set... |
1164 |
put_disk(disk); |
4345caba3 block: NULL deref... |
1165 |
out: |
0762b8bde block: always set... |
1166 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1167 1168 |
return ret; } |
d4d776299 block: clean up b... |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 |
/** * 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... |
1188 |
int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
1189 |
{ |
e525fd89d block: make blkde... |
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 |
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... |
1206 |
struct gendisk *disk = whole->bd_disk; |
6a027eff6 block: reorganize... |
1207 |
/* finish claiming */ |
77ea887e4 implement in-kern... |
1208 |
mutex_lock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1209 |
spin_lock(&bdev_lock); |
77ea887e4 implement in-kern... |
1210 |
if (!res) { |
6a027eff6 block: reorganize... |
1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 |
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... |
1230 1231 |
/* |
d4dc210f6 block: don't bloc... |
1232 1233 1234 1235 1236 |
* 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... |
1237 |
*/ |
4c49ff3fe block: blkdev_get... |
1238 1239 |
if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder && (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { |
77ea887e4 implement in-kern... |
1240 |
bdev->bd_write_holder = true; |
d4dc210f6 block: don't bloc... |
1241 |
disk_block_events(disk); |
77ea887e4 implement in-kern... |
1242 1243 1244 |
} mutex_unlock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1245 |
bdput(whole); |
e525fd89d block: make blkde... |
1246 1247 1248 |
} return res; |
37be41241 [PATCH] lockdep: ... |
1249 |
} |
1da177e4c Linux-2.6.12-rc2 |
1250 |
EXPORT_SYMBOL(blkdev_get); |
d4d776299 block: clean up b... |
1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 |
/** * 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... |
1281 1282 1283 1284 |
if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } |
d4d776299 block: clean up b... |
1285 1286 1287 1288 1289 1290 1291 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 1318 1319 1320 1321 1322 1323 1324 1325 1326 |
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 |
1327 1328 1329 |
static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
1330 1331 1332 1333 1334 1335 1336 1337 |
/* * 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 ... |
1338 1339 1340 1341 1342 1343 |
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 |
1344 |
bdev = bd_acquire(inode); |
6a2aae06c [PATCH] Fix poten... |
1345 1346 |
if (bdev == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1347 |
|
572c48921 [PATCH] sanitize ... |
1348 |
filp->f_mapping = bdev->bd_inode->i_mapping; |
e525fd89d block: make blkde... |
1349 |
return blkdev_get(bdev, filp->f_mode, filp); |
1da177e4c Linux-2.6.12-rc2 |
1350 |
} |
9a1c35427 [PATCH] pass fmod... |
1351 |
static int __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) |
2e7b651df [PATCH] remove th... |
1352 1353 |
{ int ret = 0; |
2e7b651df [PATCH] remove th... |
1354 |
struct gendisk *disk = bdev->bd_disk; |
37be41241 [PATCH] lockdep: ... |
1355 |
struct block_device *victim = NULL; |
2e7b651df [PATCH] remove th... |
1356 |
|
6796bf54a [PATCH] lockdep: ... |
1357 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
37be41241 [PATCH] lockdep: ... |
1358 1359 |
if (for_part) bdev->bd_part_count--; |
2e7b651df [PATCH] remove th... |
1360 |
if (!--bdev->bd_openers) { |
6a027eff6 block: reorganize... |
1361 |
WARN_ON_ONCE(bdev->bd_holders); |
2e7b651df [PATCH] remove th... |
1362 1363 1364 1365 1366 |
sync_blockdev(bdev); kill_bdev(bdev); } if (bdev->bd_contains == bdev) { if (disk->fops->release) |
9a1c35427 [PATCH] pass fmod... |
1367 |
ret = disk->fops->release(disk, mode); |
2e7b651df [PATCH] remove th... |
1368 1369 1370 1371 1372 1373 |
} if (!bdev->bd_openers) { struct module *owner = disk->fops->owner; put_disk(disk); module_put(owner); |
0762b8bde block: always set... |
1374 1375 |
disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
2e7b651df [PATCH] remove th... |
1376 |
bdev->bd_disk = NULL; |
a5491e0c7 fs: switch bdev i... |
1377 1378 |
bdev_inode_switch_bdi(bdev->bd_inode, &default_backing_dev_info); |
37be41241 [PATCH] lockdep: ... |
1379 1380 |
if (bdev != bdev->bd_contains) victim = bdev->bd_contains; |
2e7b651df [PATCH] remove th... |
1381 1382 |
bdev->bd_contains = NULL; } |
2e7b651df [PATCH] remove th... |
1383 1384 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
37be41241 [PATCH] lockdep: ... |
1385 |
if (victim) |
9a1c35427 [PATCH] pass fmod... |
1386 |
__blkdev_put(victim, mode, 1); |
2e7b651df [PATCH] remove th... |
1387 1388 |
return ret; } |
9a1c35427 [PATCH] pass fmod... |
1389 |
int blkdev_put(struct block_device *bdev, fmode_t mode) |
37be41241 [PATCH] lockdep: ... |
1390 |
{ |
e525fd89d block: make blkde... |
1391 |
if (mode & FMODE_EXCL) { |
6a027eff6 block: reorganize... |
1392 1393 1394 1395 1396 1397 1398 |
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. */ |
e525fd89d block: make blkde... |
1399 |
mutex_lock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 |
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... |
1412 1413 1414 1415 1416 |
/* * If this was the last claim, remove holder link and * unblock evpoll if it was a write holder. */ if (bdev_free) { |
77ea887e4 implement in-kern... |
1417 1418 |
if (bdev->bd_write_holder) { disk_unblock_events(bdev->bd_disk); |
facc31ddc block: Don't impl... |
1419 |
disk_check_events(bdev->bd_disk); |
77ea887e4 implement in-kern... |
1420 |
bdev->bd_write_holder = false; |
6936217cc block: Don't chec... |
1421 |
} |
77ea887e4 implement in-kern... |
1422 |
} |
6a027eff6 block: reorganize... |
1423 |
|
e525fd89d block: make blkde... |
1424 |
mutex_unlock(&bdev->bd_mutex); |
6936217cc block: Don't chec... |
1425 |
} |
77ea887e4 implement in-kern... |
1426 |
|
9a1c35427 [PATCH] pass fmod... |
1427 |
return __blkdev_put(bdev, mode, 0); |
37be41241 [PATCH] lockdep: ... |
1428 |
} |
2e7b651df [PATCH] remove th... |
1429 |
EXPORT_SYMBOL(blkdev_put); |
1da177e4c Linux-2.6.12-rc2 |
1430 1431 1432 |
static int blkdev_close(struct inode * inode, struct file * filp) { struct block_device *bdev = I_BDEV(filp->f_mapping->host); |
e525fd89d block: make blkde... |
1433 |
|
9a1c35427 [PATCH] pass fmod... |
1434 |
return blkdev_put(bdev, filp->f_mode); |
1da177e4c Linux-2.6.12-rc2 |
1435 |
} |
bb93e3a52 [PATCH] block: ad... |
1436 |
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1437 |
{ |
56b26add0 [PATCH] kill the ... |
1438 1439 |
struct block_device *bdev = I_BDEV(file->f_mapping->host); fmode_t mode = file->f_mode; |
fd4ce1acd [PATCH 1/2] kill ... |
1440 1441 1442 1443 1444 |
/* * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have * to updated it before every ioctl. */ |
56b26add0 [PATCH] kill the ... |
1445 |
if (file->f_flags & O_NDELAY) |
fd4ce1acd [PATCH 1/2] kill ... |
1446 1447 1448 |
mode |= FMODE_NDELAY; else mode &= ~FMODE_NDELAY; |
56b26add0 [PATCH] kill the ... |
1449 |
return blkdev_ioctl(bdev, mode, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1450 |
} |
87d8fe1ee add releasepage h... |
1451 |
/* |
eef993806 vfs: Rename gener... |
1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 |
* 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. */ ssize_t blkdev_aio_write(struct kiocb *iocb, const struct iovec *iov, unsigned long nr_segs, loff_t pos) { struct file *file = iocb->ki_filp; ssize_t ret; BUG_ON(iocb->ki_pos != pos); ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos); if (ret > 0 || ret == -EIOCBQUEUED) { ssize_t err; err = generic_write_sync(file, pos, ret); if (err < 0 && ret > 0) ret = err; } return ret; } EXPORT_SYMBOL_GPL(blkdev_aio_write); /* |
87d8fe1ee add releasepage h... |
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 |
* 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... |
1491 |
static const struct address_space_operations def_blk_aops = { |
1da177e4c Linux-2.6.12-rc2 |
1492 1493 |
.readpage = blkdev_readpage, .writepage = blkdev_writepage, |
6272b5a58 block_dev: conver... |
1494 1495 |
.write_begin = blkdev_write_begin, .write_end = blkdev_write_end, |
1da177e4c Linux-2.6.12-rc2 |
1496 |
.writepages = generic_writepages, |
87d8fe1ee add releasepage h... |
1497 |
.releasepage = blkdev_releasepage, |
1da177e4c Linux-2.6.12-rc2 |
1498 1499 |
.direct_IO = blkdev_direct_IO, }; |
4b6f5d20b [PATCH] Make most... |
1500 |
const struct file_operations def_blk_fops = { |
1da177e4c Linux-2.6.12-rc2 |
1501 1502 1503 |
.open = blkdev_open, .release = blkdev_close, .llseek = block_llseek, |
543ade1fc [PATCH] Streamlin... |
1504 1505 |
.read = do_sync_read, .write = do_sync_write, |
1da177e4c Linux-2.6.12-rc2 |
1506 |
.aio_read = generic_file_aio_read, |
eef993806 vfs: Rename gener... |
1507 |
.aio_write = blkdev_aio_write, |
1da177e4c Linux-2.6.12-rc2 |
1508 |
.mmap = generic_file_mmap, |
b1dd3b284 vfs: rename block... |
1509 |
.fsync = blkdev_fsync, |
bb93e3a52 [PATCH] block: ad... |
1510 |
.unlocked_ioctl = block_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
1511 1512 1513 |
#ifdef CONFIG_COMPAT .compat_ioctl = compat_blkdev_ioctl, #endif |
7f9c51f0d [PATCH] Add ->spl... |
1514 1515 |
.splice_read = generic_file_splice_read, .splice_write = generic_file_splice_write, |
1da177e4c Linux-2.6.12-rc2 |
1516 1517 1518 1519 1520 1521 1522 |
}; 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 ... |
1523 |
res = blkdev_ioctl(bdev, 0, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1524 1525 1526 1527 1528 1529 1530 1531 |
set_fs(old_fs); return res; } EXPORT_SYMBOL(ioctl_by_bdev); /** * lookup_bdev - lookup a struct block_device by name |
94e2959e7 fs: fix function ... |
1532 |
* @pathname: special file representing the block device |
1da177e4c Linux-2.6.12-rc2 |
1533 |
* |
57d1b5366 block_dev: fix ke... |
1534 |
* Get a reference to the blockdevice at @pathname in the current |
1da177e4c Linux-2.6.12-rc2 |
1535 1536 1537 |
* namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ |
421748ecd [PATCH] assorted ... |
1538 |
struct block_device *lookup_bdev(const char *pathname) |
1da177e4c Linux-2.6.12-rc2 |
1539 1540 1541 |
{ struct block_device *bdev; struct inode *inode; |
421748ecd [PATCH] assorted ... |
1542 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
1543 |
int error; |
421748ecd [PATCH] assorted ... |
1544 |
if (!pathname || !*pathname) |
1da177e4c Linux-2.6.12-rc2 |
1545 |
return ERR_PTR(-EINVAL); |
421748ecd [PATCH] assorted ... |
1546 |
error = kern_path(pathname, LOOKUP_FOLLOW, &path); |
1da177e4c Linux-2.6.12-rc2 |
1547 1548 |
if (error) return ERR_PTR(error); |
421748ecd [PATCH] assorted ... |
1549 |
inode = path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1550 1551 1552 1553 |
error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) goto fail; error = -EACCES; |
421748ecd [PATCH] assorted ... |
1554 |
if (path.mnt->mnt_flags & MNT_NODEV) |
1da177e4c Linux-2.6.12-rc2 |
1555 1556 1557 1558 1559 1560 |
goto fail; error = -ENOMEM; bdev = bd_acquire(inode); if (!bdev) goto fail; out: |
421748ecd [PATCH] assorted ... |
1561 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
1562 1563 1564 1565 1566 |
return bdev; fail: bdev = ERR_PTR(error); goto out; } |
d5686b444 [PATCH] switch mt... |
1567 |
EXPORT_SYMBOL(lookup_bdev); |
1da177e4c Linux-2.6.12-rc2 |
1568 |
|
93b270f76 Fix over-zealous ... |
1569 |
int __invalidate_device(struct block_device *bdev, bool kill_dirty) |
b71e8a4ce [PATCH] BLOCK: Mo... |
1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 |
{ 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 ... |
1582 |
res = invalidate_inodes(sb, kill_dirty); |
b71e8a4ce [PATCH] BLOCK: Mo... |
1583 1584 |
drop_super(sb); } |
f98393a64 mm: remove destro... |
1585 |
invalidate_bdev(bdev); |
b71e8a4ce [PATCH] BLOCK: Mo... |
1586 1587 1588 |
return res; } EXPORT_SYMBOL(__invalidate_device); |