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author | Christoph Hellwig <hch@lst.de> | 2015-01-14 10:42:32 +0100 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2015-01-20 14:02:58 -0700 |
commit | b4caecd48005fbed3949dde6c1cb233142fd69e9 (patch) | |
tree | 1fdd9b7c15568c79eb3c1ed84a39858ddbcbc88b /fs/ramfs/inode.c | |
parent | 97b713ba3ebaa6c8d84c2c720f5468a7c6a6eb4e (diff) | |
download | op-kernel-dev-b4caecd48005fbed3949dde6c1cb233142fd69e9.zip op-kernel-dev-b4caecd48005fbed3949dde6c1cb233142fd69e9.tar.gz |
fs: introduce f_op->mmap_capabilities for nommu mmap support
Since "BDI: Provide backing device capability information [try #3]" the
backing_dev_info structure also provides flags for the kind of mmap
operation available in a nommu environment, which is entirely unrelated
to it's original purpose.
Introduce a new nommu-only file operation to provide this information to
the nommu mmap code instead. Splitting this from the backing_dev_info
structure allows to remove lots of backing_dev_info instance that aren't
otherwise needed, and entirely gets rid of the concept of providing a
backing_dev_info for a character device. It also removes the need for
the mtd_inodefs filesystem.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Tejun Heo <tj@kernel.org>
Acked-by: Brian Norris <computersforpeace@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'fs/ramfs/inode.c')
-rw-r--r-- | fs/ramfs/inode.c | 22 |
1 files changed, 2 insertions, 20 deletions
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c index d365b1c..ad4d712 100644 --- a/fs/ramfs/inode.c +++ b/fs/ramfs/inode.c @@ -50,14 +50,6 @@ static const struct address_space_operations ramfs_aops = { .set_page_dirty = __set_page_dirty_no_writeback, }; -static struct backing_dev_info ramfs_backing_dev_info = { - .name = "ramfs", - .ra_pages = 0, /* No readahead */ - .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK | - BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY | - BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP, -}; - struct inode *ramfs_get_inode(struct super_block *sb, const struct inode *dir, umode_t mode, dev_t dev) { @@ -67,7 +59,7 @@ struct inode *ramfs_get_inode(struct super_block *sb, inode->i_ino = get_next_ino(); inode_init_owner(inode, dir, mode); inode->i_mapping->a_ops = &ramfs_aops; - inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info; + inode->i_mapping->backing_dev_info = &noop_backing_dev_info; mapping_set_gfp_mask(inode->i_mapping, GFP_HIGHUSER); mapping_set_unevictable(inode->i_mapping); inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; @@ -267,19 +259,9 @@ static struct file_system_type ramfs_fs_type = { int __init init_ramfs_fs(void) { static unsigned long once; - int err; if (test_and_set_bit(0, &once)) return 0; - - err = bdi_init(&ramfs_backing_dev_info); - if (err) - return err; - - err = register_filesystem(&ramfs_fs_type); - if (err) - bdi_destroy(&ramfs_backing_dev_info); - - return err; + return register_filesystem(&ramfs_fs_type); } fs_initcall(init_ramfs_fs); |