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fs/block_dev.c
47.5 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> |
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#include <linux/backing-dev.h> |
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#include <linux/module.h> #include <linux/blkpg.h> |
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#include <linux/magic.h> |
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#include <linux/buffer_head.h> |
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#include <linux/swap.h> |
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#include <linux/pagevec.h> |
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#include <linux/writeback.h> |
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#include <linux/mpage.h> #include <linux/mount.h> #include <linux/uio.h> #include <linux/namei.h> |
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#include <linux/log2.h> |
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#include <linux/cleancache.h> |
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#include <linux/dax.h> |
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#include <linux/badblocks.h> |
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#include <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); } |
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struct block_device *I_BDEV(struct inode *inode) |
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{ return &BDEV_I(inode)->bdev; } |
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EXPORT_SYMBOL(I_BDEV); |
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void __vfs_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) { struct va_format vaf; va_list args; va_start(args, fmt); vaf.fmt = fmt; vaf.va = &args; printk_ratelimited("%sVFS (%s): %pV ", prefix, sb->s_id, &vaf); va_end(args); } |
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static void bdev_write_inode(struct block_device *bdev) |
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{ |
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struct inode *inode = bdev->bd_inode; int ret; |
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spin_lock(&inode->i_lock); while (inode->i_state & I_DIRTY) { spin_unlock(&inode->i_lock); |
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ret = write_inode_now(inode, true); if (ret) { char name[BDEVNAME_SIZE]; pr_warn_ratelimited("VFS: Dirty inode writeback failed " "for block device %s (err=%d). ", bdevname(bdev, name), ret); } |
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spin_lock(&inode->i_lock); } spin_unlock(&inode->i_lock); } |
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/* Kill _all_ buffers and pagecache , dirty or not.. */ |
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void kill_bdev(struct block_device *bdev) |
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{ |
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struct address_space *mapping = bdev->bd_inode->i_mapping; |
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if (mapping->nrpages == 0 && mapping->nrexceptional == 0) |
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return; |
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|
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invalidate_bh_lrus(); |
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truncate_inode_pages(mapping, 0); |
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} |
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EXPORT_SYMBOL(kill_bdev); /* Invalidate clean unused buffers and pagecache. */ void invalidate_bdev(struct block_device *bdev) { struct address_space *mapping = bdev->bd_inode->i_mapping; 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 struct inode *bdev_file_inode(struct file *file) { return file->f_mapping->host; } |
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static ssize_t |
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blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
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{ struct file *file = iocb->ki_filp; |
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struct inode *inode = bdev_file_inode(file); |
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|
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return __blockdev_direct_IO(iocb, inode, I_BDEV(inode), iter, |
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blkdev_get_block, NULL, NULL, DIO_SKIP_DIO_COUNT); |
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} |
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int __sync_blockdev(struct block_device *bdev, int wait) { if (!bdev) return 0; if (!wait) return filemap_flush(bdev->bd_inode->i_mapping); return filemap_write_and_wait(bdev->bd_inode->i_mapping); } |
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/* * Write out and wait upon all the dirty data associated with a block * device via its mapping. Does not take the superblock lock. */ int sync_blockdev(struct block_device *bdev) { |
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return __sync_blockdev(bdev, 1); |
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} EXPORT_SYMBOL(sync_blockdev); /* * Write out and wait upon all dirty data associated with this * device. Filesystem data as well as the underlying block * device. Takes the superblock lock. */ int fsync_bdev(struct block_device *bdev) { struct super_block *sb = get_super(bdev); if (sb) { |
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int res = sync_filesystem(sb); |
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drop_super(sb); return res; } return sync_blockdev(bdev); } |
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EXPORT_SYMBOL(fsync_bdev); |
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/** * freeze_bdev -- lock a filesystem and force it into a consistent state * @bdev: blockdevice to lock * |
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* If a superblock is found on this device, we take the s_umount semaphore * on it to make sure nobody unmounts until the snapshot creation is done. * The reference counter (bd_fsfreeze_count) guarantees that only the last * unfreeze process can unfreeze the frozen filesystem actually when multiple * freeze requests arrive simultaneously. It counts up in freeze_bdev() and * count down in thaw_bdev(). When it becomes 0, thaw_bdev() will unfreeze * actually. */ struct super_block *freeze_bdev(struct block_device *bdev) { struct super_block *sb; int error = 0; mutex_lock(&bdev->bd_fsfreeze_mutex); |
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if (++bdev->bd_fsfreeze_count > 1) { /* * We don't even need to grab a reference - the first call * to freeze_bdev grab an active reference and only the last * thaw_bdev drops it. */ |
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sb = get_super(bdev); |
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if (sb) drop_super(sb); |
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mutex_unlock(&bdev->bd_fsfreeze_mutex); return sb; } sb = get_active_super(bdev); if (!sb) goto out; |
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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) |
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bdev->bd_fsfreeze_count++; |
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out: |
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mutex_unlock(&bdev->bd_fsfreeze_mutex); |
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return error; |
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} 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); |
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put_page(page); |
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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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{ |
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struct inode *bd_inode = bdev_file_inode(file); |
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loff_t retval; |
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inode_lock(bd_inode); |
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retval = fixed_size_llseek(file, offset, whence, i_size_read(bd_inode)); |
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inode_unlock(bd_inode); |
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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 = bdev_file_inode(filp); |
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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; |
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int result = -EOPNOTSUPP; |
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if (!ops->rw_page || bdev_get_integrity(bdev)) |
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return result; |
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result = blk_queue_enter(bdev->bd_queue, false); |
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if (result) return result; |
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result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, false); |
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blk_queue_exit(bdev->bd_queue); return result; |
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} 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; |
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const struct block_device_operations *ops = bdev->bd_disk->fops; |
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|
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if (!ops->rw_page || bdev_get_integrity(bdev)) |
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return -EOPNOTSUPP; |
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result = blk_queue_enter(bdev->bd_queue, false); |
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if (result) return result; |
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set_page_writeback(page); |
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result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, true); |
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if (result) end_page_writeback(page); else unlock_page(page); |
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blk_queue_exit(bdev->bd_queue); |
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return result; } EXPORT_SYMBOL_GPL(bdev_write_page); |
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/** * bdev_direct_access() - Get the address for directly-accessibly memory * @bdev: The device containing the memory |
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* @dax: control and output parameters for ->direct_access |
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* * If a block device is made up of directly addressable memory, this function * will tell the caller the PFN and the address of the memory. The address * may be directly dereferenced within the kernel without the need to call * ioremap(), kmap() or similar. The PFN is suitable for inserting into * page tables. * * Return: negative errno if an error occurs, otherwise the number of bytes * accessible at this address. */ |
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long bdev_direct_access(struct block_device *bdev, struct blk_dax_ctl *dax) |
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{ |
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458 459 |
sector_t sector = dax->sector; long avail, size = dax->size; |
dd22f551a block: Change dir... |
460 |
const struct block_device_operations *ops = bdev->bd_disk->fops; |
43c3dd08d dax: bdev_direct_... |
461 462 463 464 465 |
/* * The device driver is allowed to sleep, in order to make the * memory directly accessible. */ might_sleep(); |
dd22f551a block: Change dir... |
466 467 |
if (size < 0) return size; |
163d4baae block: add QUEUE_... |
468 |
if (!blk_queue_dax(bdev_get_queue(bdev)) || !ops->direct_access) |
dd22f551a block: Change dir... |
469 470 471 472 473 474 475 |
return -EOPNOTSUPP; if ((sector + DIV_ROUND_UP(size, 512)) > part_nr_sects_read(bdev->bd_part)) return -ERANGE; sector += get_start_sect(bdev); if (sector % (PAGE_SIZE / 512)) return -EINVAL; |
0a70bd430 dax: enable dax i... |
476 |
avail = ops->direct_access(bdev, sector, &dax->addr, &dax->pfn, size); |
dd22f551a block: Change dir... |
477 478 |
if (!avail) return -ERANGE; |
fe683adab dax: guarantee pa... |
479 480 |
if (avail > 0 && avail & ~PAGE_MASK) return -ENXIO; |
dd22f551a block: Change dir... |
481 482 483 |
return min(avail, size); } EXPORT_SYMBOL_GPL(bdev_direct_access); |
2d96afc8f block: Add bdev_d... |
484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 |
/** * bdev_dax_supported() - Check if the device supports dax for filesystem * @sb: The superblock of the device * @blocksize: The block size of the device * * This is a library function for filesystems to check if the block device * can be mounted with dax option. * * Return: negative errno if unsupported, 0 if supported. */ int bdev_dax_supported(struct super_block *sb, int blocksize) { struct blk_dax_ctl dax = { .sector = 0, .size = PAGE_SIZE, }; int err; if (blocksize != PAGE_SIZE) { vfs_msg(sb, KERN_ERR, "error: unsupported blocksize for dax"); return -EINVAL; } err = bdev_direct_access(sb->s_bdev, &dax); if (err < 0) { switch (err) { case -EOPNOTSUPP: vfs_msg(sb, KERN_ERR, "error: device does not support dax"); break; case -EINVAL: vfs_msg(sb, KERN_ERR, "error: unaligned partition for dax"); break; default: vfs_msg(sb, KERN_ERR, "error: dax access failed (%d)", err); } return err; } return 0; } EXPORT_SYMBOL_GPL(bdev_dax_supported); |
a8078b1fc block: Update blk... |
528 529 530 531 532 533 |
/** * bdev_dax_capable() - Return if the raw device is capable for dax * @bdev: The device for raw block device access */ bool bdev_dax_capable(struct block_device *bdev) { |
a8078b1fc block: Update blk... |
534 535 536 537 538 539 540 541 542 543 544 545 546 547 |
struct blk_dax_ctl dax = { .size = PAGE_SIZE, }; if (!IS_ENABLED(CONFIG_FS_DAX)) return false; dax.sector = 0; if (bdev_direct_access(bdev, &dax) < 0) return false; dax.sector = bdev->bd_part->nr_sects - (PAGE_SIZE / 512); if (bdev_direct_access(bdev, &dax) < 0) return false; |
a8078b1fc block: Update blk... |
548 549 |
return true; } |
1da177e4c Linux-2.6.12-rc2 |
550 551 552 553 554 |
/* * pseudo-fs */ static __cacheline_aligned_in_smp DEFINE_SPINLOCK(bdev_lock); |
e18b890bb [PATCH] slab: rem... |
555 |
static struct kmem_cache * bdev_cachep __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
556 557 558 |
static struct inode *bdev_alloc_inode(struct super_block *sb) { |
e94b17660 [PATCH] slab: rem... |
559 |
struct bdev_inode *ei = kmem_cache_alloc(bdev_cachep, GFP_KERNEL); |
1da177e4c Linux-2.6.12-rc2 |
560 561 562 563 |
if (!ei) return NULL; return &ei->vfs_inode; } |
fa0d7e3de fs: icache RCU fr... |
564 |
static void bdev_i_callback(struct rcu_head *head) |
1da177e4c Linux-2.6.12-rc2 |
565 |
{ |
fa0d7e3de fs: icache RCU fr... |
566 |
struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4c Linux-2.6.12-rc2 |
567 |
struct bdev_inode *bdi = BDEV_I(inode); |
1da177e4c Linux-2.6.12-rc2 |
568 569 |
kmem_cache_free(bdev_cachep, bdi); } |
fa0d7e3de fs: icache RCU fr... |
570 571 572 573 |
static void bdev_destroy_inode(struct inode *inode) { call_rcu(&inode->i_rcu, bdev_i_callback); } |
51cc50685 SL*B: drop kmem c... |
574 |
static void init_once(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
575 576 577 |
{ struct bdev_inode *ei = (struct bdev_inode *) foo; struct block_device *bdev = &ei->bdev; |
a35afb830 Remove SLAB_CTOR_... |
578 579 |
memset(bdev, 0, sizeof(*bdev)); mutex_init(&bdev->bd_mutex); |
a35afb830 Remove SLAB_CTOR_... |
580 |
INIT_LIST_HEAD(&bdev->bd_list); |
49731baa4 block: restore mu... |
581 582 583 |
#ifdef CONFIG_SYSFS INIT_LIST_HEAD(&bdev->bd_holder_disks); #endif |
a35afb830 Remove SLAB_CTOR_... |
584 |
inode_init_once(&ei->vfs_inode); |
fcccf5025 filesystem freeze... |
585 586 |
/* Initialize mutex for freeze. */ mutex_init(&bdev->bd_fsfreeze_mutex); |
1da177e4c Linux-2.6.12-rc2 |
587 |
} |
b57922d97 convert remaining... |
588 |
static void bdev_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
589 590 |
{ struct block_device *bdev = &BDEV_I(inode)->bdev; |
91b0abe36 mm + fs: store sh... |
591 |
truncate_inode_pages_final(&inode->i_data); |
b57922d97 convert remaining... |
592 |
invalidate_inode_buffers(inode); /* is it needed here? */ |
dbd5768f8 vfs: Rename end_w... |
593 |
clear_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
594 |
spin_lock(&bdev_lock); |
1da177e4c Linux-2.6.12-rc2 |
595 596 597 |
list_del_init(&bdev->bd_list); spin_unlock(&bdev_lock); } |
ee9b6d61a [PATCH] Mark stru... |
598 |
static const struct super_operations bdev_sops = { |
1da177e4c Linux-2.6.12-rc2 |
599 600 601 602 |
.statfs = simple_statfs, .alloc_inode = bdev_alloc_inode, .destroy_inode = bdev_destroy_inode, .drop_inode = generic_delete_inode, |
b57922d97 convert remaining... |
603 |
.evict_inode = bdev_evict_inode, |
1da177e4c Linux-2.6.12-rc2 |
604 |
}; |
51139adac convert get_sb_ps... |
605 606 |
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 |
607 |
{ |
3684aa709 block-dev: enable... |
608 609 |
struct dentry *dent; dent = mount_pseudo(fs_type, "bdev:", &bdev_sops, NULL, BDEVFS_MAGIC); |
e9e5e3fae bdev: fix NULL po... |
610 |
if (!IS_ERR(dent)) |
3684aa709 block-dev: enable... |
611 612 |
dent->d_sb->s_iflags |= SB_I_CGROUPWB; return dent; |
1da177e4c Linux-2.6.12-rc2 |
613 614 615 616 |
} static struct file_system_type bd_type = { .name = "bdev", |
51139adac convert get_sb_ps... |
617 |
.mount = bd_mount, |
1da177e4c Linux-2.6.12-rc2 |
618 619 |
.kill_sb = kill_anon_super, }; |
a212b105b bdi: make inode_t... |
620 621 |
struct super_block *blockdev_superblock __read_mostly; EXPORT_SYMBOL_GPL(blockdev_superblock); |
1da177e4c Linux-2.6.12-rc2 |
622 623 624 625 |
void __init bdev_cache_init(void) { int err; |
ace8577ae block_dev: Suppre... |
626 |
static struct vfsmount *bd_mnt; |
c2acf7b90 fs/block_dev.c: _... |
627 |
|
1da177e4c Linux-2.6.12-rc2 |
628 |
bdev_cachep = kmem_cache_create("bdev_cache", sizeof(struct bdev_inode), |
fffb60f93 [PATCH] cpuset me... |
629 |
0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT| |
5d097056c kmemcg: account c... |
630 |
SLAB_MEM_SPREAD|SLAB_ACCOUNT|SLAB_PANIC), |
20c2df83d mm: Remove slab d... |
631 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
632 633 634 635 |
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 |
636 637 |
if (IS_ERR(bd_mnt)) panic("Cannot create bdev pseudo-fs"); |
ace8577ae block_dev: Suppre... |
638 |
blockdev_superblock = bd_mnt->mnt_sb; /* For writeback */ |
1da177e4c Linux-2.6.12-rc2 |
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 |
} /* * 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: _... |
668 |
inode = iget5_locked(blockdev_superblock, hash(dev), |
1da177e4c Linux-2.6.12-rc2 |
669 670 671 672 673 674 675 676 677 |
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... |
678 |
bdev->bd_super = NULL; |
1da177e4c Linux-2.6.12-rc2 |
679 680 681 682 683 684 685 686 687 |
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); |
1da177e4c Linux-2.6.12-rc2 |
688 689 690 691 692 693 694 695 696 |
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... |
697 698 699 700 701 702 |
/** * 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() |
703 |
ihold(bdev->bd_inode); |
dddac6a7b PM / Hibernate: R... |
704 705 |
return bdev; } |
c1681bf8a loop: prevent bde... |
706 |
EXPORT_SYMBOL(bdgrab); |
dddac6a7b PM / Hibernate: R... |
707 |
|
1da177e4c Linux-2.6.12-rc2 |
708 709 |
long nr_blockdev_pages(void) { |
203a2935c fs/block_dev.c: u... |
710 |
struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
711 712 |
long ret = 0; spin_lock(&bdev_lock); |
203a2935c fs/block_dev.c: u... |
713 |
list_for_each_entry(bdev, &all_bdevs, bd_list) { |
1da177e4c Linux-2.6.12-rc2 |
714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 |
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... |
730 |
|
1da177e4c Linux-2.6.12-rc2 |
731 732 |
spin_lock(&bdev_lock); bdev = inode->i_bdev; |
09d967c6f [PATCH] Fix a rac... |
733 |
if (bdev) { |
ed8a9d2c8 block: use bd{gra... |
734 |
bdgrab(bdev); |
1da177e4c Linux-2.6.12-rc2 |
735 736 737 738 |
spin_unlock(&bdev_lock); return bdev; } spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
739 |
|
1da177e4c Linux-2.6.12-rc2 |
740 741 742 |
bdev = bdget(inode->i_rdev); if (bdev) { spin_lock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
743 744 |
if (!inode->i_bdev) { /* |
7de9c6ee3 new helper: ihold() |
745 |
* We take an additional reference to bd_inode, |
09d967c6f [PATCH] Fix a rac... |
746 747 748 749 |
* and it's released in clear_inode() of inode. * So, we can access it via ->i_mapping always * without igrab(). */ |
ed8a9d2c8 block: use bd{gra... |
750 |
bdgrab(bdev); |
09d967c6f [PATCH] Fix a rac... |
751 752 |
inode->i_bdev = bdev; inode->i_mapping = bdev->bd_inode->i_mapping; |
09d967c6f [PATCH] Fix a rac... |
753 |
} |
1da177e4c Linux-2.6.12-rc2 |
754 755 756 757 758 759 760 761 762 |
spin_unlock(&bdev_lock); } return bdev; } /* Call when you free inode */ void bd_forget(struct inode *inode) { |
09d967c6f [PATCH] Fix a rac... |
763 |
struct block_device *bdev = NULL; |
1da177e4c Linux-2.6.12-rc2 |
764 |
spin_lock(&bdev_lock); |
b4ea2eaa1 fs/block_dev.c: n... |
765 766 |
if (!sb_is_blkdev_sb(inode->i_sb)) bdev = inode->i_bdev; |
a4a4f9439 bdev: get rid of ... |
767 768 |
inode->i_bdev = NULL; inode->i_mapping = &inode->i_data; |
1da177e4c Linux-2.6.12-rc2 |
769 |
spin_unlock(&bdev_lock); |
09d967c6f [PATCH] Fix a rac... |
770 771 |
if (bdev) |
ed8a9d2c8 block: use bd{gra... |
772 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
773 |
} |
1a3cbbc5a block: factor out... |
774 775 776 777 778 779 |
/** * 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... |
780 |
* Test whether @bdev can be claimed by @holder. |
1a3cbbc5a block: factor out... |
781 782 783 784 785 786 787 788 789 |
* * 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 |
790 |
{ |
1da177e4c Linux-2.6.12-rc2 |
791 |
if (bdev->bd_holder == holder) |
1a3cbbc5a block: factor out... |
792 |
return true; /* already a holder */ |
1da177e4c Linux-2.6.12-rc2 |
793 |
else if (bdev->bd_holder != NULL) |
1a3cbbc5a block: factor out... |
794 |
return false; /* held by someone else */ |
1da177e4c Linux-2.6.12-rc2 |
795 |
else if (bdev->bd_contains == bdev) |
1a3cbbc5a block: factor out... |
796 |
return true; /* is a whole device which isn't held */ |
1da177e4c Linux-2.6.12-rc2 |
797 |
|
e525fd89d block: make blkde... |
798 |
else if (whole->bd_holder == bd_may_claim) |
1a3cbbc5a block: factor out... |
799 800 801 |
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 |
802 |
else |
1a3cbbc5a block: factor out... |
803 804 805 806 |
return true; /* is a partition of an un-held device */ } /** |
6b4517a79 block: implement ... |
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 |
* 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... |
831 832 |
/* if claiming is already in progress, wait for it to finish */ if (whole->bd_claiming) { |
6b4517a79 block: implement ... |
833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 |
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... |
856 857 858 859 860 861 862 |
* 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 ... |
863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 |
* * 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... |
887 888 889 890 891 892 893 894 895 896 897 898 |
/* * 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... |
899 |
module_put(disk->fops->owner); |
6b4517a79 block: implement ... |
900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 |
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... |
918 |
#ifdef CONFIG_SYSFS |
49731baa4 block: restore mu... |
919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 |
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.... |
935 |
static int add_symlink(struct kobject *from, struct kobject *to) |
641dc636b [PATCH] dm/md dep... |
936 |
{ |
4d7dd8fd9 [PATCH] blockdev.... |
937 |
return sysfs_create_link(from, to, kobject_name(to)); |
641dc636b [PATCH] dm/md dep... |
938 939 940 941 |
} static void del_symlink(struct kobject *from, struct kobject *to) { |
641dc636b [PATCH] dm/md dep... |
942 943 |
sysfs_remove_link(from, kobject_name(to)); } |
641dc636b [PATCH] dm/md dep... |
944 |
/** |
e09b457bd block: simplify h... |
945 946 947 |
* 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 ... |
948 |
* |
49731baa4 block: restore mu... |
949 950 |
* DON'T USE THIS UNLESS YOU'RE ALREADY USING IT. * |
e09b457bd block: simplify h... |
951 |
* This functions creates the following sysfs symlinks. |
641dc636b [PATCH] dm/md dep... |
952 |
* |
e09b457bd block: simplify h... |
953 954 |
* - 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... |
955 |
* |
e09b457bd block: simplify h... |
956 957 |
* 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... |
958 |
* |
e09b457bd block: simplify h... |
959 960 |
* /sys/block/dm-0/slaves/sda --> /sys/block/sda * /sys/block/sda/holders/dm-0 --> /sys/block/dm-0 |
641dc636b [PATCH] dm/md dep... |
961 |
* |
e09b457bd block: simplify h... |
962 963 964 |
* 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... |
965 |
* |
e09b457bd block: simplify h... |
966 967 |
* CONTEXT: * Might sleep. |
641dc636b [PATCH] dm/md dep... |
968 |
* |
e09b457bd block: simplify h... |
969 970 |
* RETURNS: * 0 on success, -errno on failure. |
641dc636b [PATCH] dm/md dep... |
971 |
*/ |
e09b457bd block: simplify h... |
972 |
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) |
641dc636b [PATCH] dm/md dep... |
973 |
{ |
49731baa4 block: restore mu... |
974 |
struct bd_holder_disk *holder; |
e09b457bd block: simplify h... |
975 |
int ret = 0; |
641dc636b [PATCH] dm/md dep... |
976 |
|
2e7b651df [PATCH] remove th... |
977 |
mutex_lock(&bdev->bd_mutex); |
df6c0cd9a [PATCH] clean up ... |
978 |
|
49731baa4 block: restore mu... |
979 |
WARN_ON_ONCE(!bdev->bd_holder); |
4e91672c7 Replace obscure c... |
980 |
|
e09b457bd block: simplify h... |
981 982 983 |
/* 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... |
984 |
|
49731baa4 block: restore mu... |
985 986 987 |
holder = bd_find_holder_disk(bdev, disk); if (holder) { holder->refcnt++; |
e09b457bd block: simplify h... |
988 |
goto out_unlock; |
49731baa4 block: restore mu... |
989 |
} |
641dc636b [PATCH] dm/md dep... |
990 |
|
49731baa4 block: restore mu... |
991 992 993 |
holder = kzalloc(sizeof(*holder), GFP_KERNEL); if (!holder) { ret = -ENOMEM; |
e09b457bd block: simplify h... |
994 995 |
goto out_unlock; } |
641dc636b [PATCH] dm/md dep... |
996 |
|
49731baa4 block: restore mu... |
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 |
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... |
1008 1009 1010 1011 1012 |
/* * 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... |
1013 1014 1015 1016 1017 1018 1019 1020 |
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... |
1021 |
out_unlock: |
b4cf1b72e [PATCH] dm/md dep... |
1022 |
mutex_unlock(&bdev->bd_mutex); |
e09b457bd block: simplify h... |
1023 |
return ret; |
641dc636b [PATCH] dm/md dep... |
1024 |
} |
e09b457bd block: simplify h... |
1025 |
EXPORT_SYMBOL_GPL(bd_link_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1026 |
|
49731baa4 block: restore mu... |
1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
/** * 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... |
1038 |
{ |
49731baa4 block: restore mu... |
1039 |
struct bd_holder_disk *holder; |
641dc636b [PATCH] dm/md dep... |
1040 |
|
49731baa4 block: restore mu... |
1041 |
mutex_lock(&bdev->bd_mutex); |
641dc636b [PATCH] dm/md dep... |
1042 |
|
49731baa4 block: restore mu... |
1043 1044 1045 1046 1047 1048 |
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... |
1049 |
kobject_put(bdev->bd_part->holder_dir); |
49731baa4 block: restore mu... |
1050 1051 1052 1053 1054 |
list_del_init(&holder->list); kfree(holder); } mutex_unlock(&bdev->bd_mutex); |
1da177e4c Linux-2.6.12-rc2 |
1055 |
} |
49731baa4 block: restore mu... |
1056 |
EXPORT_SYMBOL_GPL(bd_unlink_disk_holder); |
641dc636b [PATCH] dm/md dep... |
1057 |
#endif |
1da177e4c Linux-2.6.12-rc2 |
1058 |
|
0c002c2f7 Wrapper for lower... |
1059 |
/** |
56ade44b4 Added flush_disk ... |
1060 1061 1062 |
* flush_disk - invalidates all buffer-cache entries on a disk * * @bdev: struct block device to be flushed |
e6eb5ce1b fs/block_dev.c: f... |
1063 |
* @kill_dirty: flag to guide handling of dirty inodes |
56ade44b4 Added flush_disk ... |
1064 1065 1066 1067 1068 |
* * 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 ... |
1069 |
static void flush_disk(struct block_device *bdev, bool kill_dirty) |
56ade44b4 Added flush_disk ... |
1070 |
{ |
93b270f76 Fix over-zealous ... |
1071 |
if (__invalidate_device(bdev, kill_dirty)) { |
56ade44b4 Added flush_disk ... |
1072 |
printk(KERN_WARNING "VFS: busy inodes on changed media or " |
424081f3c fs: use gendisk->... |
1073 1074 1075 |
"resized disk %s ", bdev->bd_disk ? bdev->bd_disk->disk_name : ""); |
56ade44b4 Added flush_disk ... |
1076 1077 1078 1079 |
} if (!bdev->bd_disk) return; |
d27769ec3 block: add GENHD_... |
1080 |
if (disk_part_scan_enabled(bdev->bd_disk)) |
56ade44b4 Added flush_disk ... |
1081 1082 1083 1084 |
bdev->bd_invalidated = 1; } /** |
57d1b5366 block_dev: fix ke... |
1085 |
* check_disk_size_change - checks for disk size change and adjusts bdev size. |
c3279d145 Adjust block devi... |
1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 |
* @disk: struct gendisk to check * @bdev: struct bdev to adjust. * * This routine checks to see if the bdev size does not match the disk size * and adjusts it if it differs. */ void check_disk_size_change(struct gendisk *disk, struct block_device *bdev) { loff_t disk_size, bdev_size; disk_size = (loff_t)get_capacity(disk) << 9; bdev_size = i_size_read(bdev->bd_inode); if (disk_size != bdev_size) { |
c3279d145 Adjust block devi... |
1099 1100 1101 |
printk(KERN_INFO "%s: detected capacity change from %lld to %lld ", |
424081f3c fs: use gendisk->... |
1102 |
disk->disk_name, bdev_size, disk_size); |
c3279d145 Adjust block devi... |
1103 |
i_size_write(bdev->bd_inode, disk_size); |
93b270f76 Fix over-zealous ... |
1104 |
flush_disk(bdev, false); |
c3279d145 Adjust block devi... |
1105 1106 1107 1108 1109 |
} } EXPORT_SYMBOL(check_disk_size_change); /** |
57d1b5366 block_dev: fix ke... |
1110 |
* revalidate_disk - wrapper for lower-level driver's revalidate_disk call-back |
0c002c2f7 Wrapper for lower... |
1111 1112 1113 1114 1115 1116 1117 1118 |
* @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... |
1119 |
struct block_device *bdev; |
0c002c2f7 Wrapper for lower... |
1120 1121 1122 1123 |
int ret = 0; if (disk->fops->revalidate_disk) ret = disk->fops->revalidate_disk(disk); |
25520d55c block: Inline blk... |
1124 |
blk_integrity_revalidate(disk); |
c3279d145 Adjust block devi... |
1125 1126 1127 1128 1129 1130 |
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... |
1131 |
bdev->bd_invalidated = 0; |
c3279d145 Adjust block devi... |
1132 1133 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
0c002c2f7 Wrapper for lower... |
1134 1135 1136 |
return ret; } EXPORT_SYMBOL(revalidate_disk); |
1da177e4c Linux-2.6.12-rc2 |
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 |
/* * 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... |
1149 |
const struct block_device_operations *bdops = disk->fops; |
77ea887e4 implement in-kern... |
1150 |
unsigned int events; |
1da177e4c Linux-2.6.12-rc2 |
1151 |
|
77ea887e4 implement in-kern... |
1152 1153 1154 |
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 |
1155 |
return 0; |
93b270f76 Fix over-zealous ... |
1156 |
flush_disk(bdev, true); |
1da177e4c Linux-2.6.12-rc2 |
1157 1158 |
if (bdops->revalidate_disk) bdops->revalidate_disk(bdev->bd_disk); |
1da177e4c Linux-2.6.12-rc2 |
1159 1160 1161 1162 1163 1164 1165 |
return 1; } EXPORT_SYMBOL(check_disk_change); void bd_set_size(struct block_device *bdev, loff_t size) { |
e1defc4ff block: Do away wi... |
1166 |
unsigned bsize = bdev_logical_block_size(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1167 |
|
5955102c9 wrappers for ->i_... |
1168 |
inode_lock(bdev->bd_inode); |
d646a02a9 block: use i_size... |
1169 |
i_size_write(bdev->bd_inode, size); |
5955102c9 wrappers for ->i_... |
1170 |
inode_unlock(bdev->bd_inode); |
09cbfeaf1 mm, fs: get rid o... |
1171 |
while (bsize < PAGE_SIZE) { |
1da177e4c Linux-2.6.12-rc2 |
1172 1173 1174 1175 1176 1177 1178 1179 |
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()... |
1180 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part); |
37be41241 [PATCH] lockdep: ... |
1181 |
|
6d740cd5b [PATCH] lockdep: ... |
1182 1183 1184 1185 1186 1187 |
/* * bd_mutex locking: * * mutex_lock(part->bd_mutex) * mutex_lock_nested(whole->bd_mutex, 1) */ |
572c48921 [PATCH] sanitize ... |
1188 |
static int __blkdev_get(struct block_device *bdev, fmode_t mode, int for_part) |
1da177e4c Linux-2.6.12-rc2 |
1189 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1190 |
struct gendisk *disk; |
523e1d399 block: make gendi... |
1191 |
struct module *owner; |
7db9cfd38 devscgroup: check... |
1192 |
int ret; |
cf771cb5a block: make varia... |
1193 |
int partno; |
fe6e9c1f2 [PATCH] fix cgrou... |
1194 |
int perm = 0; |
572c48921 [PATCH] sanitize ... |
1195 |
if (mode & FMODE_READ) |
fe6e9c1f2 [PATCH] fix cgrou... |
1196 |
perm |= MAY_READ; |
572c48921 [PATCH] sanitize ... |
1197 |
if (mode & FMODE_WRITE) |
fe6e9c1f2 [PATCH] fix cgrou... |
1198 1199 1200 1201 |
perm |= MAY_WRITE; /* * hooks: /n/, see "layering violations". */ |
b7300b78d blkdev: cgroup wh... |
1202 1203 1204 1205 1206 1207 |
if (!for_part) { ret = devcgroup_inode_permission(bdev->bd_inode, perm); if (ret != 0) { bdput(bdev); return ret; } |
826660203 [PATCH] fix bdev ... |
1208 |
} |
7db9cfd38 devscgroup: check... |
1209 |
|
d3374825c md: make devices ... |
1210 |
restart: |
0762b8bde block: always set... |
1211 |
|
89f97496e block: fix __blkd... |
1212 |
ret = -ENXIO; |
cf771cb5a block: make varia... |
1213 |
disk = get_gendisk(bdev->bd_dev, &partno); |
0762b8bde block: always set... |
1214 |
if (!disk) |
6e9624b8c block: push down ... |
1215 |
goto out; |
523e1d399 block: make gendi... |
1216 |
owner = disk->fops->owner; |
1da177e4c Linux-2.6.12-rc2 |
1217 |
|
69e02c59a block: Don't chec... |
1218 |
disk_block_events(disk); |
6796bf54a [PATCH] lockdep: ... |
1219 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
1da177e4c Linux-2.6.12-rc2 |
1220 1221 |
if (!bdev->bd_openers) { bdev->bd_disk = disk; |
87192a2a4 vfs: cache reques... |
1222 |
bdev->bd_queue = disk->queue; |
1da177e4c Linux-2.6.12-rc2 |
1223 |
bdev->bd_contains = bdev; |
03cdadb04 block: disable bl... |
1224 |
|
cf771cb5a block: make varia... |
1225 |
if (!partno) { |
89f97496e block: fix __blkd... |
1226 1227 1228 1229 |
ret = -ENXIO; bdev->bd_part = disk_get_part(disk, partno); if (!bdev->bd_part) goto out_clear; |
1196f8b81 block: rescan par... |
1230 |
ret = 0; |
1da177e4c Linux-2.6.12-rc2 |
1231 |
if (disk->fops->open) { |
572c48921 [PATCH] sanitize ... |
1232 |
ret = disk->fops->open(bdev, mode); |
d3374825c md: make devices ... |
1233 1234 1235 1236 1237 1238 1239 |
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 ... |
1240 |
bdev->bd_disk = NULL; |
87192a2a4 vfs: cache reques... |
1241 |
bdev->bd_queue = NULL; |
d3374825c md: make devices ... |
1242 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1243 |
disk_unblock_events(disk); |
69e02c59a block: Don't chec... |
1244 |
put_disk(disk); |
523e1d399 block: make gendi... |
1245 |
module_put(owner); |
d3374825c md: make devices ... |
1246 1247 |
goto restart; } |
1da177e4c Linux-2.6.12-rc2 |
1248 |
} |
7e69723fe block: move bd_se... |
1249 |
|
223757016 block_dev: remove... |
1250 |
if (!ret) |
7e69723fe block: move bd_se... |
1251 |
bd_set_size(bdev,(loff_t)get_capacity(disk)<<9); |
7e69723fe block: move bd_se... |
1252 |
|
1196f8b81 block: rescan par... |
1253 1254 1255 1256 1257 1258 |
/* * 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... |
1259 1260 1261 1262 1263 1264 |
if (bdev->bd_invalidated) { if (!ret) rescan_partitions(disk, bdev); else if (ret == -ENOMEDIUM) invalidate_partitions(disk, bdev); } |
5a023cdba block: enable dax... |
1265 |
|
1196f8b81 block: rescan par... |
1266 1267 |
if (ret) goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1268 |
} else { |
1da177e4c Linux-2.6.12-rc2 |
1269 1270 1271 1272 |
struct block_device *whole; whole = bdget_disk(disk, 0); ret = -ENOMEM; if (!whole) |
0762b8bde block: always set... |
1273 |
goto out_clear; |
37be41241 [PATCH] lockdep: ... |
1274 |
BUG_ON(for_part); |
572c48921 [PATCH] sanitize ... |
1275 |
ret = __blkdev_get(whole, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1276 |
if (ret) |
0762b8bde block: always set... |
1277 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1278 |
bdev->bd_contains = whole; |
89f97496e block: fix __blkd... |
1279 |
bdev->bd_part = disk_get_part(disk, partno); |
e71bf0d0e block: fix disk->... |
1280 |
if (!(disk->flags & GENHD_FL_UP) || |
89f97496e block: fix __blkd... |
1281 |
!bdev->bd_part || !bdev->bd_part->nr_sects) { |
1da177e4c Linux-2.6.12-rc2 |
1282 |
ret = -ENXIO; |
0762b8bde block: always set... |
1283 |
goto out_clear; |
1da177e4c Linux-2.6.12-rc2 |
1284 |
} |
89f97496e block: fix __blkd... |
1285 |
bd_set_size(bdev, (loff_t)bdev->bd_part->nr_sects << 9); |
1da177e4c Linux-2.6.12-rc2 |
1286 1287 |
} } else { |
1da177e4c Linux-2.6.12-rc2 |
1288 |
if (bdev->bd_contains == bdev) { |
1196f8b81 block: rescan par... |
1289 1290 |
ret = 0; if (bdev->bd_disk->fops->open) |
572c48921 [PATCH] sanitize ... |
1291 |
ret = bdev->bd_disk->fops->open(bdev, mode); |
1196f8b81 block: rescan par... |
1292 |
/* the same as first opener case, read comment there */ |
fe316bf2d block: Fix NULL p... |
1293 1294 1295 1296 1297 1298 |
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... |
1299 1300 |
if (ret) goto out_unlock_bdev; |
1da177e4c Linux-2.6.12-rc2 |
1301 |
} |
69e02c59a block: Don't chec... |
1302 |
/* only one opener holds refs to the module and disk */ |
69e02c59a block: Don't chec... |
1303 |
put_disk(disk); |
523e1d399 block: make gendi... |
1304 |
module_put(owner); |
1da177e4c Linux-2.6.12-rc2 |
1305 1306 |
} bdev->bd_openers++; |
37be41241 [PATCH] lockdep: ... |
1307 1308 |
if (for_part) bdev->bd_part_count++; |
c039e3134 [PATCH] sem2mutex... |
1309 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1310 |
disk_unblock_events(disk); |
1da177e4c Linux-2.6.12-rc2 |
1311 |
return 0; |
0762b8bde block: always set... |
1312 |
out_clear: |
89f97496e block: fix __blkd... |
1313 |
disk_put_part(bdev->bd_part); |
1da177e4c Linux-2.6.12-rc2 |
1314 |
bdev->bd_disk = NULL; |
0762b8bde block: always set... |
1315 |
bdev->bd_part = NULL; |
87192a2a4 vfs: cache reques... |
1316 |
bdev->bd_queue = NULL; |
1da177e4c Linux-2.6.12-rc2 |
1317 |
if (bdev != bdev->bd_contains) |
572c48921 [PATCH] sanitize ... |
1318 |
__blkdev_put(bdev->bd_contains, mode, 1); |
1da177e4c Linux-2.6.12-rc2 |
1319 |
bdev->bd_contains = NULL; |
0762b8bde block: always set... |
1320 |
out_unlock_bdev: |
c039e3134 [PATCH] sem2mutex... |
1321 |
mutex_unlock(&bdev->bd_mutex); |
69e02c59a block: Don't chec... |
1322 |
disk_unblock_events(disk); |
0762b8bde block: always set... |
1323 |
put_disk(disk); |
523e1d399 block: make gendi... |
1324 |
module_put(owner); |
4345caba3 block: NULL deref... |
1325 |
out: |
0762b8bde block: always set... |
1326 |
bdput(bdev); |
1da177e4c Linux-2.6.12-rc2 |
1327 1328 |
return ret; } |
d4d776299 block: clean up b... |
1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 |
/** * 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... |
1348 |
int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder) |
1da177e4c Linux-2.6.12-rc2 |
1349 |
{ |
e525fd89d block: make blkde... |
1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 |
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... |
1366 |
struct gendisk *disk = whole->bd_disk; |
6a027eff6 block: reorganize... |
1367 |
/* finish claiming */ |
77ea887e4 implement in-kern... |
1368 |
mutex_lock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1369 |
spin_lock(&bdev_lock); |
77ea887e4 implement in-kern... |
1370 |
if (!res) { |
6a027eff6 block: reorganize... |
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 |
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... |
1390 1391 |
/* |
d4dc210f6 block: don't bloc... |
1392 1393 1394 1395 1396 |
* 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... |
1397 |
*/ |
4c49ff3fe block: blkdev_get... |
1398 1399 |
if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder && (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) { |
77ea887e4 implement in-kern... |
1400 |
bdev->bd_write_holder = true; |
d4dc210f6 block: don't bloc... |
1401 |
disk_block_events(disk); |
77ea887e4 implement in-kern... |
1402 1403 1404 |
} mutex_unlock(&bdev->bd_mutex); |
6a027eff6 block: reorganize... |
1405 |
bdput(whole); |
e525fd89d block: make blkde... |
1406 1407 1408 |
} return res; |
37be41241 [PATCH] lockdep: ... |
1409 |
} |
1da177e4c Linux-2.6.12-rc2 |
1410 |
EXPORT_SYMBOL(blkdev_get); |
d4d776299 block: clean up b... |
1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 |
/** * 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... |
1441 1442 1443 1444 |
if ((mode & FMODE_WRITE) && bdev_read_only(bdev)) { blkdev_put(bdev, mode); return ERR_PTR(-EACCES); } |
d4d776299 block: clean up b... |
1445 1446 1447 1448 1449 1450 1451 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 1479 1480 1481 1482 1483 1484 1485 1486 |
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 |
1487 1488 1489 |
static int blkdev_open(struct inode * inode, struct file * filp) { struct block_device *bdev; |
1da177e4c Linux-2.6.12-rc2 |
1490 1491 1492 1493 1494 1495 1496 1497 |
/* * 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 ... |
1498 1499 1500 1501 1502 1503 |
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 |
1504 |
bdev = bd_acquire(inode); |
6a2aae06c [PATCH] Fix poten... |
1505 1506 |
if (bdev == NULL) return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
1507 |
|
572c48921 [PATCH] sanitize ... |
1508 |
filp->f_mapping = bdev->bd_inode->i_mapping; |
e525fd89d block: make blkde... |
1509 |
return blkdev_get(bdev, filp->f_mode, filp); |
1da177e4c Linux-2.6.12-rc2 |
1510 |
} |
4385bab12 make blkdev_put()... |
1511 |
static void __blkdev_put(struct block_device *bdev, fmode_t mode, int for_part) |
2e7b651df [PATCH] remove th... |
1512 |
{ |
2e7b651df [PATCH] remove th... |
1513 |
struct gendisk *disk = bdev->bd_disk; |
37be41241 [PATCH] lockdep: ... |
1514 |
struct block_device *victim = NULL; |
2e7b651df [PATCH] remove th... |
1515 |
|
6796bf54a [PATCH] lockdep: ... |
1516 |
mutex_lock_nested(&bdev->bd_mutex, for_part); |
37be41241 [PATCH] lockdep: ... |
1517 1518 |
if (for_part) bdev->bd_part_count--; |
2e7b651df [PATCH] remove th... |
1519 |
if (!--bdev->bd_openers) { |
6a027eff6 block: reorganize... |
1520 |
WARN_ON_ONCE(bdev->bd_holders); |
2e7b651df [PATCH] remove th... |
1521 1522 |
sync_blockdev(bdev); kill_bdev(bdev); |
43d1c0eb7 block: detach bde... |
1523 1524 |
bdev_write_inode(bdev); |
564f00f6c block_dev: only w... |
1525 |
/* |
43d1c0eb7 block: detach bde... |
1526 1527 1528 |
* Detaching bdev inode from its wb in __destroy_inode() * is too late: the queue which embeds its bdi (along with * root wb) can be gone as soon as we put_disk() below. |
94007751b Avoid dereferenci... |
1529 |
*/ |
43d1c0eb7 block: detach bde... |
1530 |
inode_detach_wb(bdev->bd_inode); |
2e7b651df [PATCH] remove th... |
1531 1532 1533 |
} if (bdev->bd_contains == bdev) { if (disk->fops->release) |
db2a144be block_device_oper... |
1534 |
disk->fops->release(disk, mode); |
2e7b651df [PATCH] remove th... |
1535 1536 1537 |
} if (!bdev->bd_openers) { struct module *owner = disk->fops->owner; |
0762b8bde block: always set... |
1538 1539 |
disk_put_part(bdev->bd_part); bdev->bd_part = NULL; |
2e7b651df [PATCH] remove th... |
1540 |
bdev->bd_disk = NULL; |
37be41241 [PATCH] lockdep: ... |
1541 1542 |
if (bdev != bdev->bd_contains) victim = bdev->bd_contains; |
2e7b651df [PATCH] remove th... |
1543 |
bdev->bd_contains = NULL; |
523e1d399 block: make gendi... |
1544 1545 1546 |
put_disk(disk); module_put(owner); |
2e7b651df [PATCH] remove th... |
1547 |
} |
2e7b651df [PATCH] remove th... |
1548 1549 |
mutex_unlock(&bdev->bd_mutex); bdput(bdev); |
37be41241 [PATCH] lockdep: ... |
1550 |
if (victim) |
9a1c35427 [PATCH] pass fmod... |
1551 |
__blkdev_put(victim, mode, 1); |
2e7b651df [PATCH] remove th... |
1552 |
} |
4385bab12 make blkdev_put()... |
1553 |
void blkdev_put(struct block_device *bdev, fmode_t mode) |
37be41241 [PATCH] lockdep: ... |
1554 |
{ |
85ef06d1d block: flush MEDI... |
1555 |
mutex_lock(&bdev->bd_mutex); |
e525fd89d block: make blkde... |
1556 |
if (mode & FMODE_EXCL) { |
6a027eff6 block: reorganize... |
1557 1558 1559 1560 1561 1562 1563 |
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... |
1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 |
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... |
1576 1577 1578 1579 |
/* * If this was the last claim, remove holder link and * unblock evpoll if it was a write holder. */ |
85ef06d1d block: flush MEDI... |
1580 1581 1582 |
if (bdev_free && bdev->bd_write_holder) { disk_unblock_events(bdev->bd_disk); bdev->bd_write_holder = false; |
77ea887e4 implement in-kern... |
1583 |
} |
6936217cc block: Don't chec... |
1584 |
} |
77ea887e4 implement in-kern... |
1585 |
|
85ef06d1d block: flush MEDI... |
1586 1587 1588 1589 1590 1591 1592 1593 |
/* * 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()... |
1594 |
__blkdev_put(bdev, mode, 0); |
37be41241 [PATCH] lockdep: ... |
1595 |
} |
2e7b651df [PATCH] remove th... |
1596 |
EXPORT_SYMBOL(blkdev_put); |
1da177e4c Linux-2.6.12-rc2 |
1597 1598 |
static int blkdev_close(struct inode * inode, struct file * filp) { |
4ebb16ca9 block: introduce ... |
1599 |
struct block_device *bdev = I_BDEV(bdev_file_inode(filp)); |
4385bab12 make blkdev_put()... |
1600 1601 |
blkdev_put(bdev, filp->f_mode); return 0; |
1da177e4c Linux-2.6.12-rc2 |
1602 |
} |
bb93e3a52 [PATCH] block: ad... |
1603 |
static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg) |
1da177e4c Linux-2.6.12-rc2 |
1604 |
{ |
4ebb16ca9 block: introduce ... |
1605 |
struct block_device *bdev = I_BDEV(bdev_file_inode(file)); |
56b26add0 [PATCH] kill the ... |
1606 |
fmode_t mode = file->f_mode; |
fd4ce1acd [PATCH 1/2] kill ... |
1607 1608 1609 1610 1611 |
/* * O_NDELAY can be altered using fcntl(.., F_SETFL, ..), so we have * to updated it before every ioctl. */ |
56b26add0 [PATCH] kill the ... |
1612 |
if (file->f_flags & O_NDELAY) |
fd4ce1acd [PATCH 1/2] kill ... |
1613 1614 1615 |
mode |= FMODE_NDELAY; else mode &= ~FMODE_NDELAY; |
56b26add0 [PATCH] kill the ... |
1616 |
return blkdev_ioctl(bdev, mode, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1617 |
} |
87d8fe1ee add releasepage h... |
1618 |
/* |
eef993806 vfs: Rename gener... |
1619 1620 1621 1622 1623 1624 |
* 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(... |
1625 |
ssize_t blkdev_write_iter(struct kiocb *iocb, struct iov_iter *from) |
eef993806 vfs: Rename gener... |
1626 1627 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1628 |
struct inode *bd_inode = bdev_file_inode(file); |
7ec7b94a3 blkdev_write_iter... |
1629 |
loff_t size = i_size_read(bd_inode); |
53362a05a fs/block-dev.c:fi... |
1630 |
struct blk_plug plug; |
eef993806 vfs: Rename gener... |
1631 |
ssize_t ret; |
5f380c7fa lift generic_writ... |
1632 |
|
7ec7b94a3 blkdev_write_iter... |
1633 1634 |
if (bdev_read_only(I_BDEV(bd_inode))) return -EPERM; |
5f380c7fa lift generic_writ... |
1635 |
|
7ec7b94a3 blkdev_write_iter... |
1636 |
if (!iov_iter_count(from)) |
5f380c7fa lift generic_writ... |
1637 |
return 0; |
7ec7b94a3 blkdev_write_iter... |
1638 1639 1640 1641 |
if (iocb->ki_pos >= size) return -ENOSPC; iov_iter_truncate(from, size - iocb->ki_pos); |
eef993806 vfs: Rename gener... |
1642 |
|
53362a05a fs/block-dev.c:fi... |
1643 |
blk_start_plug(&plug); |
1456c0a87 blkdev_aio_write(... |
1644 |
ret = __generic_file_write_iter(iocb, from); |
e25922176 fs: simplify the ... |
1645 1646 |
if (ret > 0) ret = generic_write_sync(iocb, ret); |
53362a05a fs/block-dev.c:fi... |
1647 |
blk_finish_plug(&plug); |
eef993806 vfs: Rename gener... |
1648 1649 |
return ret; } |
1456c0a87 blkdev_aio_write(... |
1650 |
EXPORT_SYMBOL_GPL(blkdev_write_iter); |
eef993806 vfs: Rename gener... |
1651 |
|
b2de525f0 Return short read... |
1652 |
ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) |
684c9aaeb vfs: fix O_DIRECT... |
1653 1654 |
{ struct file *file = iocb->ki_filp; |
4ebb16ca9 block: introduce ... |
1655 |
struct inode *bd_inode = bdev_file_inode(file); |
684c9aaeb vfs: fix O_DIRECT... |
1656 |
loff_t size = i_size_read(bd_inode); |
a886038ba fs/block_dev.c: s... |
1657 |
loff_t pos = iocb->ki_pos; |
684c9aaeb vfs: fix O_DIRECT... |
1658 1659 1660 1661 1662 |
if (pos >= size) return 0; size -= pos; |
a886038ba fs/block_dev.c: s... |
1663 1664 |
iov_iter_truncate(to, size); return generic_file_read_iter(iocb, to); |
684c9aaeb vfs: fix O_DIRECT... |
1665 |
} |
b2de525f0 Return short read... |
1666 |
EXPORT_SYMBOL_GPL(blkdev_read_iter); |
684c9aaeb vfs: fix O_DIRECT... |
1667 |
|
eef993806 vfs: Rename gener... |
1668 |
/* |
87d8fe1ee add releasepage h... |
1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 |
* Try to release a page associated with block device when the system * is under memory pressure. */ static int blkdev_releasepage(struct page *page, gfp_t wait) { struct super_block *super = BDEV_I(page->mapping->host)->bdev.bd_super; if (super && super->s_op->bdev_try_to_free_page) return super->s_op->bdev_try_to_free_page(super, page, wait); return try_to_free_buffers(page); } |
7f6d5b529 dax: move writeba... |
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 |
static int blkdev_writepages(struct address_space *mapping, struct writeback_control *wbc) { if (dax_mapping(mapping)) { struct block_device *bdev = I_BDEV(mapping->host); return dax_writeback_mapping_range(mapping, bdev, wbc); } return generic_writepages(mapping, wbc); } |
4c54ac62d make struct def_b... |
1691 |
static const struct address_space_operations def_blk_aops = { |
1da177e4c Linux-2.6.12-rc2 |
1692 |
.readpage = blkdev_readpage, |
447f05bb4 block_dev: implem... |
1693 |
.readpages = blkdev_readpages, |
1da177e4c Linux-2.6.12-rc2 |
1694 |
.writepage = blkdev_writepage, |
6272b5a58 block_dev: conver... |
1695 1696 |
.write_begin = blkdev_write_begin, .write_end = blkdev_write_end, |
7f6d5b529 dax: move writeba... |
1697 |
.writepages = blkdev_writepages, |
87d8fe1ee add releasepage h... |
1698 |
.releasepage = blkdev_releasepage, |
1da177e4c Linux-2.6.12-rc2 |
1699 |
.direct_IO = blkdev_direct_IO, |
b45972265 mm: vmscan: take ... |
1700 |
.is_dirty_writeback = buffer_check_dirty_writeback, |
1da177e4c Linux-2.6.12-rc2 |
1701 |
}; |
4b6f5d20b [PATCH] Make most... |
1702 |
const struct file_operations def_blk_fops = { |
1da177e4c Linux-2.6.12-rc2 |
1703 1704 1705 |
.open = blkdev_open, .release = blkdev_close, .llseek = block_llseek, |
a886038ba fs/block_dev.c: s... |
1706 |
.read_iter = blkdev_read_iter, |
1456c0a87 blkdev_aio_write(... |
1707 |
.write_iter = blkdev_write_iter, |
acc93d30d Revert "block: en... |
1708 |
.mmap = generic_file_mmap, |
b1dd3b284 vfs: rename block... |
1709 |
.fsync = blkdev_fsync, |
bb93e3a52 [PATCH] block: ad... |
1710 |
.unlocked_ioctl = block_ioctl, |
1da177e4c Linux-2.6.12-rc2 |
1711 1712 1713 |
#ifdef CONFIG_COMPAT .compat_ioctl = compat_blkdev_ioctl, #endif |
1e8b33328 blockdev: remove ... |
1714 |
.splice_read = generic_file_splice_read, |
8d0207652 ->splice_write() ... |
1715 |
.splice_write = iter_file_splice_write, |
1da177e4c Linux-2.6.12-rc2 |
1716 1717 1718 1719 1720 1721 1722 |
}; 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 ... |
1723 |
res = blkdev_ioctl(bdev, 0, cmd, arg); |
1da177e4c Linux-2.6.12-rc2 |
1724 1725 1726 1727 1728 1729 1730 1731 |
set_fs(old_fs); return res; } EXPORT_SYMBOL(ioctl_by_bdev); /** * lookup_bdev - lookup a struct block_device by name |
94e2959e7 fs: fix function ... |
1732 |
* @pathname: special file representing the block device |
1da177e4c Linux-2.6.12-rc2 |
1733 |
* |
57d1b5366 block_dev: fix ke... |
1734 |
* Get a reference to the blockdevice at @pathname in the current |
1da177e4c Linux-2.6.12-rc2 |
1735 1736 1737 |
* namespace if possible and return it. Return ERR_PTR(error) * otherwise. */ |
421748ecd [PATCH] assorted ... |
1738 |
struct block_device *lookup_bdev(const char *pathname) |
1da177e4c Linux-2.6.12-rc2 |
1739 1740 1741 |
{ struct block_device *bdev; struct inode *inode; |
421748ecd [PATCH] assorted ... |
1742 |
struct path path; |
1da177e4c Linux-2.6.12-rc2 |
1743 |
int error; |
421748ecd [PATCH] assorted ... |
1744 |
if (!pathname || !*pathname) |
1da177e4c Linux-2.6.12-rc2 |
1745 |
return ERR_PTR(-EINVAL); |
421748ecd [PATCH] assorted ... |
1746 |
error = kern_path(pathname, LOOKUP_FOLLOW, &path); |
1da177e4c Linux-2.6.12-rc2 |
1747 1748 |
if (error) return ERR_PTR(error); |
bb668734c VFS: assorted d_b... |
1749 |
inode = d_backing_inode(path.dentry); |
1da177e4c Linux-2.6.12-rc2 |
1750 1751 1752 1753 |
error = -ENOTBLK; if (!S_ISBLK(inode->i_mode)) goto fail; error = -EACCES; |
a2982cc92 vfs: Generalize f... |
1754 |
if (!may_open_dev(&path)) |
1da177e4c Linux-2.6.12-rc2 |
1755 1756 1757 1758 1759 1760 |
goto fail; error = -ENOMEM; bdev = bd_acquire(inode); if (!bdev) goto fail; out: |
421748ecd [PATCH] assorted ... |
1761 |
path_put(&path); |
1da177e4c Linux-2.6.12-rc2 |
1762 1763 1764 1765 1766 |
return bdev; fail: bdev = ERR_PTR(error); goto out; } |
d5686b444 [PATCH] switch mt... |
1767 |
EXPORT_SYMBOL(lookup_bdev); |
1da177e4c Linux-2.6.12-rc2 |
1768 |
|
93b270f76 Fix over-zealous ... |
1769 |
int __invalidate_device(struct block_device *bdev, bool kill_dirty) |
b71e8a4ce [PATCH] BLOCK: Mo... |
1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 |
{ 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 ... |
1782 |
res = invalidate_inodes(sb, kill_dirty); |
b71e8a4ce [PATCH] BLOCK: Mo... |
1783 1784 |
drop_super(sb); } |
f98393a64 mm: remove destro... |
1785 |
invalidate_bdev(bdev); |
b71e8a4ce [PATCH] BLOCK: Mo... |
1786 1787 1788 |
return res; } EXPORT_SYMBOL(__invalidate_device); |
5c0d6b60a vfs: Create funct... |
1789 1790 1791 1792 |
void iterate_bdevs(void (*func)(struct block_device *, void *), void *arg) { struct inode *inode, *old_inode = NULL; |
74278da9f inode: convert in... |
1793 |
spin_lock(&blockdev_superblock->s_inode_list_lock); |
5c0d6b60a vfs: Create funct... |
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 |
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); |
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spin_unlock(&blockdev_superblock->s_inode_list_lock); |
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/* * We hold a reference to 'inode' so it couldn't have been * removed from s_inodes list while we dropped the |
74278da9f inode: convert in... |
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* s_inode_list_lock We cannot iput the inode now as we can |
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* be holding the last reference and we cannot iput it under |
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* s_inode_list_lock. So we keep the reference and iput it |
5c0d6b60a vfs: Create funct... |
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* later. */ iput(old_inode); old_inode = inode; func(I_BDEV(inode), arg); |
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spin_lock(&blockdev_superblock->s_inode_list_lock); |
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} |
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spin_unlock(&blockdev_superblock->s_inode_list_lock); |
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iput(old_inode); } |