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authorChristoph Hellwig <hch@lst.de>2015-01-14 12:42:32 +0300
committerJens Axboe <axboe@fb.com>2015-01-21 00:02:58 +0300
commitb4caecd48005fbed3949dde6c1cb233142fd69e9 (patch)
tree1fdd9b7c15568c79eb3c1ed84a39858ddbcbc88b /fs/configfs
parent97b713ba3ebaa6c8d84c2c720f5468a7c6a6eb4e (diff)
downloadlinux-b4caecd48005fbed3949dde6c1cb233142fd69e9.tar.xz
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/configfs')
-rw-r--r--fs/configfs/configfs_internal.h2
-rw-r--r--fs/configfs/inode.c18
-rw-r--r--fs/configfs/mount.c11
3 files changed, 3 insertions, 28 deletions
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index bd4a3c167091..a315677e44d3 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -70,8 +70,6 @@ extern int configfs_is_root(struct config_item *item);
extern struct inode * configfs_new_inode(umode_t mode, struct configfs_dirent *, struct super_block *);
extern int configfs_create(struct dentry *, umode_t mode, int (*init)(struct inode *));
-extern int configfs_inode_init(void);
-extern void configfs_inode_exit(void);
extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
extern int configfs_make_dirent(struct configfs_dirent *,
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 5946ad98053f..0ad6b4d6de00 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -50,12 +50,6 @@ static const struct address_space_operations configfs_aops = {
.write_end = simple_write_end,
};
-static struct backing_dev_info configfs_backing_dev_info = {
- .name = "configfs",
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
static const struct inode_operations configfs_inode_operations ={
.setattr = configfs_setattr,
};
@@ -137,7 +131,7 @@ struct inode *configfs_new_inode(umode_t mode, struct configfs_dirent *sd,
if (inode) {
inode->i_ino = get_next_ino();
inode->i_mapping->a_ops = &configfs_aops;
- inode->i_mapping->backing_dev_info = &configfs_backing_dev_info;
+ inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
inode->i_op = &configfs_inode_operations;
if (sd->s_iattr) {
@@ -283,13 +277,3 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
}
mutex_unlock(&dir->d_inode->i_mutex);
}
-
-int __init configfs_inode_init(void)
-{
- return bdi_init(&configfs_backing_dev_info);
-}
-
-void configfs_inode_exit(void)
-{
- bdi_destroy(&configfs_backing_dev_info);
-}
diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index f6c285833390..da94e41bdbf6 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -145,19 +145,13 @@ static int __init configfs_init(void)
if (!config_kobj)
goto out2;
- err = configfs_inode_init();
- if (err)
- goto out3;
-
err = register_filesystem(&configfs_fs_type);
if (err)
- goto out4;
+ goto out3;
return 0;
-out4:
- pr_err("Unable to register filesystem!\n");
- configfs_inode_exit();
out3:
+ pr_err("Unable to register filesystem!\n");
kobject_put(config_kobj);
out2:
kmem_cache_destroy(configfs_dir_cachep);
@@ -172,7 +166,6 @@ static void __exit configfs_exit(void)
kobject_put(config_kobj);
kmem_cache_destroy(configfs_dir_cachep);
configfs_dir_cachep = NULL;
- configfs_inode_exit();
}
MODULE_AUTHOR("Oracle");