[mirror_ubuntu-artful-kernel.git] / fs / coda / inode.c

/*
 * Super block/filesystem wide operations
 *
 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and 
 * Michael Callahan <callahan@maths.ox.ac.uk> 
 * 
 * Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
 * Copyright (C) Carnegie Mellon University
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/smp_lock.h>
#include <linux/file.h>
#include <linux/vfs.h>

#include <asm/system.h>
#include <asm/uaccess.h>

#include <linux/fs.h>
#include <linux/vmalloc.h>

#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_psdev.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_cache.h>

#include "coda_int.h"

/* VFS super_block ops */
static void coda_clear_inode(struct inode *);
static void coda_put_super(struct super_block *);
static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);

static struct kmem_cache * coda_inode_cachep;

static struct inode *coda_alloc_inode(struct super_block *sb)
{
	struct coda_inode_info *ei;
	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
	if (!ei)
		return NULL;
	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	ei->c_flags = 0;
	ei->c_uid = 0;
	ei->c_cached_perm = 0;
	return &ei->vfs_inode;
}

static void coda_destroy_inode(struct inode *inode)
{
	kmem_cache_free(coda_inode_cachep, ITOC(inode));
}

static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
{
	struct coda_inode_info *ei = (struct coda_inode_info *) foo;

	inode_init_once(&ei->vfs_inode);
}

int coda_init_inodecache(void)
{
	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
				sizeof(struct coda_inode_info),
				0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
				init_once);
	if (coda_inode_cachep == NULL)
		return -ENOMEM;
	return 0;
}

void coda_destroy_inodecache(void)
{
	kmem_cache_destroy(coda_inode_cachep);
}

static int coda_remount(struct super_block *sb, int *flags, char *data)
{
	*flags |= MS_NOATIME;
	return 0;
}

/* exported operations */
static const struct super_operations coda_super_operations =
{
	.alloc_inode	= coda_alloc_inode,
	.destroy_inode	= coda_destroy_inode,
	.clear_inode	= coda_clear_inode,
	.put_super	= coda_put_super,
	.statfs		= coda_statfs,
	.remount_fs	= coda_remount,
};

static int get_device_index(struct coda_mount_data *data)
{
	struct file *file;
	struct inode *inode;
	int idx;

	if(data == NULL) {
		printk("coda_read_super: Bad mount data\n");
		return -1;
	}

	if(data->version != CODA_MOUNT_VERSION) {
		printk("coda_read_super: Bad mount version\n");
		return -1;
	}

	file = fget(data->fd);
	inode = NULL;
	if(file)
		inode = file->f_path.dentry->d_inode;
	
	if(!inode || !S_ISCHR(inode->i_mode) ||
	   imajor(inode) != CODA_PSDEV_MAJOR) {
		if(file)
			fput(file);

		printk("coda_read_super: Bad file\n");
		return -1;
	}

	idx = iminor(inode);
	fput(file);

	if(idx < 0 || idx >= MAX_CODADEVS) {
		printk("coda_read_super: Bad minor number\n");
		return -1;
	}

	return idx;
}

static int coda_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *root = NULL;
	struct venus_comm *vc = NULL;
	struct CodaFid fid;
	int error;
	int idx;

	idx = get_device_index((struct coda_mount_data *) data);

	/* Ignore errors in data, for backward compatibility */
	if(idx == -1)
		idx = 0;
	
	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);

	vc = &coda_comms[idx];
	if (!vc->vc_inuse) {
		printk("coda_read_super: No pseudo device\n");
		return -EINVAL;
	}

        if ( vc->vc_sb ) {
		printk("coda_read_super: Device already mounted\n");
		return -EBUSY;
	}

	vc->vc_sb = sb;

	sb->s_fs_info = vc;
	sb->s_flags |= MS_NOATIME;
	sb->s_blocksize = 4096;	/* XXXXX  what do we put here?? */
	sb->s_blocksize_bits = 12;
	sb->s_magic = CODA_SUPER_MAGIC;
	sb->s_op = &coda_super_operations;

	/* get root fid from Venus: this needs the root inode */
	error = venus_rootfid(sb, &fid);
	if ( error ) {
	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
		       error);
		goto error;
	}
	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	
	/* make root inode */
        error = coda_cnode_make(&root, &fid, sb);
        if ( error || !root ) {
	    printk("Failure of coda_cnode_make for root: error %d\n", error);
	    goto error;
	} 

	printk("coda_read_super: rootinode is %ld dev %s\n", 
	       root->i_ino, root->i_sb->s_id);
	sb->s_root = d_alloc_root(root);
	if (!sb->s_root)
		goto error;
        return 0;

 error:
	if (root)
		iput(root);
	if (vc)
		vc->vc_sb = NULL;

	return -EINVAL;
}

static void coda_put_super(struct super_block *sb)
{
	coda_vcp(sb)->vc_sb = NULL;
	sb->s_fs_info = NULL;

	printk("Coda: Bye bye.\n");
}

static void coda_clear_inode(struct inode *inode)
{
	coda_cache_clear_inode(inode);
}

int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
	int err = coda_revalidate_inode(dentry);
	if (!err)
		generic_fillattr(dentry->d_inode, stat);
	return err;
}

int coda_setattr(struct dentry *de, struct iattr *iattr)
{
	struct inode *inode = de->d_inode;
	struct coda_vattr vattr;
	int error;

	lock_kernel();
	
	memset(&vattr, 0, sizeof(vattr)); 

	inode->i_ctime = CURRENT_TIME_SEC;
	coda_iattr_to_vattr(iattr, &vattr);
	vattr.va_type = C_VNON; /* cannot set type */

	/* Venus is responsible for truncating the container-file!!! */
	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);

	if ( !error ) {
	        coda_vattr_to_iattr(inode, &vattr); 
		coda_cache_clear_inode(inode);
	}

	unlock_kernel();

	return error;
}

const struct inode_operations coda_file_inode_operations = {
	.permission	= coda_permission,
	.getattr	= coda_getattr,
	.setattr	= coda_setattr,
};

static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	int error;
	
	lock_kernel();

	error = venus_statfs(dentry, buf);

	unlock_kernel();

	if (error) {
		/* fake something like AFS does */
		buf->f_blocks = 9000000;
		buf->f_bfree  = 9000000;
		buf->f_bavail = 9000000;
		buf->f_files  = 9000000;
		buf->f_ffree  = 9000000;
	}

	/* and fill in the rest */
	buf->f_type = CODA_SUPER_MAGIC;
	buf->f_bsize = 4096;
	buf->f_namelen = CODA_MAXNAMLEN;

	return 0; 
}

/* init_coda: used by filesystems.c to register coda */

static int coda_get_sb(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
}

struct file_system_type coda_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "coda",
	.get_sb		= coda_get_sb,
	.kill_sb	= kill_anon_super,
	.fs_flags	= FS_BINARY_MOUNTDATA,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Super block/filesystem wide operations
	3	*
	4	* Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
	5	* Michael Callahan <callahan@maths.ox.ac.uk>
	6	*
	7	* Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
	8	* Copyright (C) Carnegie Mellon University
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/mm.h>
	14	#include <linux/string.h>
	15	#include <linux/stat.h>
	16	#include <linux/errno.h>
	17	#include <linux/unistd.h>
	18	#include <linux/smp_lock.h>
	19	#include <linux/file.h>
	20	#include <linux/vfs.h>
	21
	22	#include <asm/system.h>
	23	#include <asm/uaccess.h>
	24
	25	#include <linux/fs.h>
	26	#include <linux/vmalloc.h>
	27
	28	#include <linux/coda.h>
	29	#include <linux/coda_linux.h>
	30	#include <linux/coda_psdev.h>
	31	#include <linux/coda_fs_i.h>
	32	#include <linux/coda_cache.h>
	33
c98d8cfb AB	34	#include "coda_int.h"
c98d8cfb AB	35
1da177e4 LT	36	/* VFS super_block ops */
	37	static void coda_clear_inode(struct inode *);
	38	static void coda_put_super(struct super_block *);
726c3342	39	static int coda_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4	40
e18b890b	41	static struct kmem_cache * coda_inode_cachep;
1da177e4 LT	42
	43	static struct inode coda_alloc_inode(struct super_block sb)
	44	{
	45	struct coda_inode_info *ei;
e94b1766	46	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
1da177e4 LT	47	if (!ei)
	48	return NULL;
	49	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	50	ei->c_flags = 0;
	51	ei->c_uid = 0;
	52	ei->c_cached_perm = 0;
	53	return &ei->vfs_inode;
	54	}
	55
	56	static void coda_destroy_inode(struct inode *inode)
	57	{
	58	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	59	}
	60
e18b890b	61	static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
1da177e4 LT	62	{
	63	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	64
a35afb83	65	inode_init_once(&ei->vfs_inode);
1da177e4	66	}
20c2df83	67
1da177e4 LT	68	int coda_init_inodecache(void)
	69	{
	70	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	71	sizeof(struct coda_inode_info),
4b6a9316	72	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	73	init_once);
1da177e4 LT	74	if (coda_inode_cachep == NULL)
	75	return -ENOMEM;
	76	return 0;
	77	}
	78
	79	void coda_destroy_inodecache(void)
	80	{
1a1d92c1	81	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	82	}
	83
	84	static int coda_remount(struct super_block sb, int flags, char *data)
	85	{
fac1f0e3	86	*flags \|= MS_NOATIME;
1da177e4 LT	87	return 0;
	88	}
	89
	90	/* exported operations */
ee9b6d61	91	static const struct super_operations coda_super_operations =
1da177e4 LT	92	{
	93	.alloc_inode = coda_alloc_inode,
	94	.destroy_inode = coda_destroy_inode,
	95	.clear_inode = coda_clear_inode,
	96	.put_super = coda_put_super,
	97	.statfs = coda_statfs,
	98	.remount_fs = coda_remount,
	99	};
	100
	101	static int get_device_index(struct coda_mount_data *data)
	102	{
	103	struct file *file;
	104	struct inode *inode;
	105	int idx;
	106
	107	if(data == NULL) {
	108	printk("coda_read_super: Bad mount data\n");
	109	return -1;
	110	}
	111
	112	if(data->version != CODA_MOUNT_VERSION) {
	113	printk("coda_read_super: Bad mount version\n");
	114	return -1;
	115	}
	116
	117	file = fget(data->fd);
	118	inode = NULL;
	119	if(file)
d4176d32	120	inode = file->f_path.dentry->d_inode;
1da177e4 LT	121
	122	if(!inode \|\| !S_ISCHR(inode->i_mode) \|\|
	123	imajor(inode) != CODA_PSDEV_MAJOR) {
	124	if(file)
	125	fput(file);
	126
	127	printk("coda_read_super: Bad file\n");
	128	return -1;
	129	}
	130
	131	idx = iminor(inode);
	132	fput(file);
	133
	134	if(idx < 0 \|\| idx >= MAX_CODADEVS) {
	135	printk("coda_read_super: Bad minor number\n");
	136	return -1;
	137	}
	138
	139	return idx;
	140	}
	141
	142	static int coda_fill_super(struct super_block sb, void data, int silent)
	143	{
a1b0aa87	144	struct inode *root = NULL;
1da177e4 LT	145	struct venus_comm *vc = NULL;
1da177e4 LT	146	struct CodaFid fid;
a1b0aa87	147	int error;
1da177e4 LT	148	int idx;
	149
	150	idx = get_device_index((struct coda_mount_data *) data);
	151
	152	/* Ignore errors in data, for backward compatibility */
	153	if(idx == -1)
	154	idx = 0;
	155
	156	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	157
	158	vc = &coda_comms[idx];
	159	if (!vc->vc_inuse) {
	160	printk("coda_read_super: No pseudo device\n");
	161	return -EINVAL;
	162	}
	163
	164	if ( vc->vc_sb ) {
	165	printk("coda_read_super: Device already mounted\n");
	166	return -EBUSY;
	167	}
	168
1da177e4 LT	169	vc->vc_sb = sb;
1da177e4 LT	170
a1b0aa87	171	sb->s_fs_info = vc;
fac1f0e3 JH	172	sb->s_flags \|= MS_NOATIME;
	173	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	174	sb->s_blocksize_bits = 12;
	175	sb->s_magic = CODA_SUPER_MAGIC;
	176	sb->s_op = &coda_super_operations;
1da177e4 LT	177
	178	/* get root fid from Venus: this needs the root inode */
	179	error = venus_rootfid(sb, &fid);
	180	if ( error ) {
	181	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	182	error);
	183	goto error;
	184	}
	185	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	186
	187	/* make root inode */
	188	error = coda_cnode_make(&root, &fid, sb);
	189	if ( error \|\| !root ) {
	190	printk("Failure of coda_cnode_make for root: error %d\n", error);
	191	goto error;
	192	}
	193
	194	printk("coda_read_super: rootinode is %ld dev %s\n",
	195	root->i_ino, root->i_sb->s_id);
	196	sb->s_root = d_alloc_root(root);
	197	if (!sb->s_root)
	198	goto error;
	199	return 0;
	200
	201	error:
1da177e4	202	if (root)
a1b0aa87 JH	203	iput(root);
	204	if (vc)
	205	vc->vc_sb = NULL;
1da177e4	206
a1b0aa87	207	return -EINVAL;
1da177e4 LT	208	}
	209
	210	static void coda_put_super(struct super_block *sb)
	211	{
a1b0aa87 JH	212	coda_vcp(sb)->vc_sb = NULL;
a1b0aa87 JH	213	sb->s_fs_info = NULL;
1da177e4 LT	214
1da177e4 LT	215	printk("Coda: Bye bye.\n");
1da177e4 LT	216	}
	217
	218	static void coda_clear_inode(struct inode *inode)
	219	{
	220	coda_cache_clear_inode(inode);
	221	}
	222
	223	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	224	{
	225	int err = coda_revalidate_inode(dentry);
	226	if (!err)
	227	generic_fillattr(dentry->d_inode, stat);
	228	return err;
	229	}
	230
	231	int coda_setattr(struct dentry de, struct iattr iattr)
	232	{
	233	struct inode *inode = de->d_inode;
	234	struct coda_vattr vattr;
	235	int error;
	236
	237	lock_kernel();
	238
	239	memset(&vattr, 0, sizeof(vattr));
	240
	241	inode->i_ctime = CURRENT_TIME_SEC;
	242	coda_iattr_to_vattr(iattr, &vattr);
	243	vattr.va_type = C_VNON; /* cannot set type */
	244
	245	/* Venus is responsible for truncating the container-file!!! */
	246	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	247
	248	if ( !error ) {
	249	coda_vattr_to_iattr(inode, &vattr);
	250	coda_cache_clear_inode(inode);
	251	}
	252
	253	unlock_kernel();
	254
	255	return error;
	256	}
	257
754661f1	258	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	259	.permission = coda_permission,
	260	.getattr = coda_getattr,
	261	.setattr = coda_setattr,
	262	};
	263
726c3342	264	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	265	{
	266	int error;
	267
	268	lock_kernel();
	269
726c3342	270	error = venus_statfs(dentry, buf);
1da177e4 LT	271
	272	unlock_kernel();
	273
	274	if (error) {
	275	/* fake something like AFS does */
	276	buf->f_blocks = 9000000;
	277	buf->f_bfree = 9000000;
	278	buf->f_bavail = 9000000;
	279	buf->f_files = 9000000;
	280	buf->f_ffree = 9000000;
	281	}
	282
	283	/* and fill in the rest */
	284	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	285	buf->f_bsize = 4096;
1da177e4 LT	286	buf->f_namelen = CODA_MAXNAMLEN;
	287
	288	return 0;
	289	}
	290
	291	/* init_coda: used by filesystems.c to register coda */
	292
454e2398 DH	293	static int coda_get_sb(struct file_system_type *fs_type,
454e2398 DH	294	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	295	{
454e2398	296	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
1da177e4 LT	297	}
	298
	299	struct file_system_type coda_fs_type = {
	300	.owner = THIS_MODULE,
	301	.name = "coda",
	302	.get_sb = coda_get_sb,
	303	.kill_sb = kill_anon_super,
	304	.fs_flags = FS_BINARY_MOUNTDATA,
	305	};
	306