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add releasepage hooks to block devices which can be used by file systems
Implement blkdev_releasepage() to release the buffer_heads and pages after we release private data belonging to a mounted filesystem. Cc: Toshiyuki Okajima <toshi.okajima@jp.fujitsu.com> Cc: linux-fsdevel@vger.kernel.org Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -1220,6 +1220,20 @@ static long block_ioctl(struct file *file, unsigned cmd, unsigned long arg)
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return blkdev_ioctl(bdev, mode, cmd, arg);
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}
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/*
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* Try to release a page associated with block device when the system
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* is under memory pressure.
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*/
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static int blkdev_releasepage(struct page *page, gfp_t wait)
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{
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struct super_block *super = BDEV_I(page->mapping->host)->bdev.bd_super;
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if (super && super->s_op->bdev_try_to_free_page)
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return super->s_op->bdev_try_to_free_page(super, page, wait);
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return try_to_free_buffers(page);
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}
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static const struct address_space_operations def_blk_aops = {
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.readpage = blkdev_readpage,
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.writepage = blkdev_writepage,
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@ -1227,6 +1241,7 @@ static const struct address_space_operations def_blk_aops = {
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.write_begin = blkdev_write_begin,
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.write_end = blkdev_write_end,
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.writepages = generic_writepages,
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.releasepage = blkdev_releasepage,
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.direct_IO = blkdev_direct_IO,
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};
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@ -800,6 +800,7 @@ int get_sb_bdev(struct file_system_type *fs_type,
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}
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s->s_flags |= MS_ACTIVE;
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bdev->bd_super = s;
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}
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return simple_set_mnt(mnt, s);
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@ -819,6 +820,7 @@ void kill_block_super(struct super_block *sb)
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struct block_device *bdev = sb->s_bdev;
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fmode_t mode = sb->s_mode;
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bdev->bd_super = 0;
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generic_shutdown_super(sb);
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sync_blockdev(bdev);
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close_bdev_exclusive(bdev, mode);
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@ -565,6 +565,7 @@ struct address_space {
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struct block_device {
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dev_t bd_dev; /* not a kdev_t - it's a search key */
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struct inode * bd_inode; /* will die */
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struct super_block * bd_super;
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int bd_openers;
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struct mutex bd_mutex; /* open/close mutex */
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struct semaphore bd_mount_sem;
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@ -1385,6 +1386,7 @@ struct super_operations {
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ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
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ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
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#endif
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int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
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};
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/*
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