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fs: introduce f_op->mmap_capabilities for nommu mmap support

Browse source 
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 <[email protected]>
Reviewed-by: Tejun Heo <[email protected]>
Acked-by: Brian Norris <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2015-01-14 10:42:32 +01:00 • committed by Jens Axboe
commit b4caecd480
32 changed files with 169 additions and 346 deletions
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2
fs/configfs/configfs_internal.h
View file

@ -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 *,

18
fs/configfs/inode.c
View file

@ -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);
}

11
fs/configfs/mount.c
View file

@ -145,19 +145,13 @@ static int __init configfs_init(void)
if (!config_kobj)
goto out2;
err = configfs_inode_init();
err = register_filesystem(&configfs_fs_type);
if (err)
goto out3;
err = register_filesystem(&configfs_fs_type);
if (err)
goto out4;
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");