[deliverable/linux.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 <linux/slab.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 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;
	}

	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
	if (error)
		goto bdi_err;

	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;
	sb->s_bdi = &vc->bdi;

	/* 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:
	bdi_destroy(&vc->bdi);
 bdi_err:
	if (root)
		iput(root);
	if (vc)
		vc->vc_sb = NULL;

	return -EINVAL;
}

static void coda_put_super(struct super_block *sb)
{
	bdi_destroy(&coda_vcp(sb)->bdi);
	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>
5a0e3ad6	21	#include <linux/slab.h>
1da177e4 LT	22
	23	#include <asm/system.h>
	24	#include <asm/uaccess.h>
	25
	26	#include <linux/fs.h>
	27	#include <linux/vmalloc.h>
	28
	29	#include <linux/coda.h>
	30	#include <linux/coda_linux.h>
	31	#include <linux/coda_psdev.h>
	32	#include <linux/coda_fs_i.h>
	33	#include <linux/coda_cache.h>
	34
c98d8cfb AB	35	#include "coda_int.h"
c98d8cfb AB	36
1da177e4 LT	37	/* VFS super_block ops */
	38	static void coda_clear_inode(struct inode *);
	39	static void coda_put_super(struct super_block *);
726c3342	40	static int coda_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4	41
e18b890b	42	static struct kmem_cache * coda_inode_cachep;
1da177e4 LT	43
	44	static struct inode coda_alloc_inode(struct super_block sb)
	45	{
	46	struct coda_inode_info *ei;
e94b1766	47	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
1da177e4 LT	48	if (!ei)
	49	return NULL;
	50	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	51	ei->c_flags = 0;
	52	ei->c_uid = 0;
	53	ei->c_cached_perm = 0;
	54	return &ei->vfs_inode;
	55	}
	56
	57	static void coda_destroy_inode(struct inode *inode)
	58	{
	59	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	60	}
	61
51cc5068	62	static void init_once(void *foo)
1da177e4 LT	63	{
	64	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	65
a35afb83	66	inode_init_once(&ei->vfs_inode);
1da177e4	67	}
20c2df83	68
1da177e4 LT	69	int coda_init_inodecache(void)
	70	{
	71	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	72	sizeof(struct coda_inode_info),
4b6a9316	73	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	74	init_once);
1da177e4 LT	75	if (coda_inode_cachep == NULL)
	76	return -ENOMEM;
	77	return 0;
	78	}
	79
	80	void coda_destroy_inodecache(void)
	81	{
1a1d92c1	82	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	83	}
	84
	85	static int coda_remount(struct super_block sb, int flags, char *data)
	86	{
fac1f0e3	87	*flags \|= MS_NOATIME;
1da177e4 LT	88	return 0;
	89	}
	90
	91	/* exported operations */
ee9b6d61	92	static const struct super_operations coda_super_operations =
1da177e4 LT	93	{
	94	.alloc_inode = coda_alloc_inode,
	95	.destroy_inode = coda_destroy_inode,
	96	.clear_inode = coda_clear_inode,
	97	.put_super = coda_put_super,
	98	.statfs = coda_statfs,
	99	.remount_fs = coda_remount,
	100	};
	101
	102	static int get_device_index(struct coda_mount_data *data)
	103	{
	104	struct file *file;
	105	struct inode *inode;
	106	int idx;
	107
	108	if(data == NULL) {
	109	printk("coda_read_super: Bad mount data\n");
	110	return -1;
	111	}
	112
	113	if(data->version != CODA_MOUNT_VERSION) {
	114	printk("coda_read_super: Bad mount version\n");
	115	return -1;
	116	}
	117
	118	file = fget(data->fd);
	119	inode = NULL;
	120	if(file)
d4176d32	121	inode = file->f_path.dentry->d_inode;
1da177e4 LT	122
	123	if(!inode \|\| !S_ISCHR(inode->i_mode) \|\|
	124	imajor(inode) != CODA_PSDEV_MAJOR) {
	125	if(file)
	126	fput(file);
	127
	128	printk("coda_read_super: Bad file\n");
	129	return -1;
	130	}
	131
	132	idx = iminor(inode);
	133	fput(file);
	134
	135	if(idx < 0 \|\| idx >= MAX_CODADEVS) {
	136	printk("coda_read_super: Bad minor number\n");
	137	return -1;
	138	}
	139
	140	return idx;
	141	}
	142
	143	static int coda_fill_super(struct super_block sb, void data, int silent)
	144	{
a1b0aa87	145	struct inode *root = NULL;
1da177e4 LT	146	struct venus_comm *vc = NULL;
1da177e4 LT	147	struct CodaFid fid;
a1b0aa87	148	int error;
1da177e4 LT	149	int idx;
	150
	151	idx = get_device_index((struct coda_mount_data *) data);
	152
	153	/* Ignore errors in data, for backward compatibility */
	154	if(idx == -1)
	155	idx = 0;
	156
	157	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	158
	159	vc = &coda_comms[idx];
	160	if (!vc->vc_inuse) {
	161	printk("coda_read_super: No pseudo device\n");
	162	return -EINVAL;
	163	}
	164
	165	if ( vc->vc_sb ) {
	166	printk("coda_read_super: Device already mounted\n");
	167	return -EBUSY;
	168	}
	169
5163d900 JA	170	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
	171	if (error)
	172	goto bdi_err;
	173
1da177e4 LT	174	vc->vc_sb = sb;
1da177e4 LT	175
a1b0aa87	176	sb->s_fs_info = vc;
fac1f0e3 JH	177	sb->s_flags \|= MS_NOATIME;
	178	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	179	sb->s_blocksize_bits = 12;
	180	sb->s_magic = CODA_SUPER_MAGIC;
	181	sb->s_op = &coda_super_operations;
5163d900	182	sb->s_bdi = &vc->bdi;
1da177e4 LT	183
	184	/* get root fid from Venus: this needs the root inode */
	185	error = venus_rootfid(sb, &fid);
	186	if ( error ) {
	187	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	188	error);
	189	goto error;
	190	}
	191	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	192
	193	/* make root inode */
	194	error = coda_cnode_make(&root, &fid, sb);
	195	if ( error \|\| !root ) {
	196	printk("Failure of coda_cnode_make for root: error %d\n", error);
	197	goto error;
	198	}
	199
	200	printk("coda_read_super: rootinode is %ld dev %s\n",
	201	root->i_ino, root->i_sb->s_id);
	202	sb->s_root = d_alloc_root(root);
	203	if (!sb->s_root)
	204	goto error;
	205	return 0;
	206
	207	error:
5163d900 JA	208	bdi_destroy(&vc->bdi);
5163d900 JA	209	bdi_err:
1da177e4	210	if (root)
a1b0aa87 JH	211	iput(root);
	212	if (vc)
	213	vc->vc_sb = NULL;
1da177e4	214
a1b0aa87	215	return -EINVAL;
1da177e4 LT	216	}
	217
	218	static void coda_put_super(struct super_block *sb)
	219	{
5163d900	220	bdi_destroy(&coda_vcp(sb)->bdi);
a1b0aa87 JH	221	coda_vcp(sb)->vc_sb = NULL;
a1b0aa87 JH	222	sb->s_fs_info = NULL;
1da177e4 LT	223
1da177e4 LT	224	printk("Coda: Bye bye.\n");
1da177e4 LT	225	}
	226
	227	static void coda_clear_inode(struct inode *inode)
	228	{
	229	coda_cache_clear_inode(inode);
	230	}
	231
	232	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	233	{
	234	int err = coda_revalidate_inode(dentry);
	235	if (!err)
	236	generic_fillattr(dentry->d_inode, stat);
	237	return err;
	238	}
	239
	240	int coda_setattr(struct dentry de, struct iattr iattr)
	241	{
	242	struct inode *inode = de->d_inode;
	243	struct coda_vattr vattr;
	244	int error;
	245
	246	lock_kernel();
	247
	248	memset(&vattr, 0, sizeof(vattr));
	249
	250	inode->i_ctime = CURRENT_TIME_SEC;
	251	coda_iattr_to_vattr(iattr, &vattr);
	252	vattr.va_type = C_VNON; /* cannot set type */
	253
	254	/* Venus is responsible for truncating the container-file!!! */
	255	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	256
	257	if ( !error ) {
	258	coda_vattr_to_iattr(inode, &vattr);
	259	coda_cache_clear_inode(inode);
	260	}
	261
	262	unlock_kernel();
	263
	264	return error;
	265	}
	266
754661f1	267	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	268	.permission = coda_permission,
	269	.getattr = coda_getattr,
	270	.setattr = coda_setattr,
	271	};
	272
726c3342	273	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	274	{
	275	int error;
	276
	277	lock_kernel();
	278
726c3342	279	error = venus_statfs(dentry, buf);
1da177e4 LT	280
	281	unlock_kernel();
	282
	283	if (error) {
	284	/* fake something like AFS does */
	285	buf->f_blocks = 9000000;
	286	buf->f_bfree = 9000000;
	287	buf->f_bavail = 9000000;
	288	buf->f_files = 9000000;
	289	buf->f_ffree = 9000000;
	290	}
	291
	292	/* and fill in the rest */
	293	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	294	buf->f_bsize = 4096;
1da177e4 LT	295	buf->f_namelen = CODA_MAXNAMLEN;
	296
	297	return 0;
	298	}
	299
	300	/* init_coda: used by filesystems.c to register coda */
	301
454e2398 DH	302	static int coda_get_sb(struct file_system_type *fs_type,
454e2398 DH	303	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	304	{
454e2398	305	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
1da177e4 LT	306	}
	307
	308	struct file_system_type coda_fs_type = {
	309	.owner = THIS_MODULE,
	310	.name = "coda",
	311	.get_sb = coda_get_sb,
	312	.kill_sb = kill_anon_super,
	313	.fs_flags = FS_BINARY_MOUNTDATA,
	314	};
	315