[net-next-2.6.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/mutex.h>
#include <linux/spinlock.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_evict_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;
	spin_lock_init(&ei->c_lock);
	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,
	.evict_inode	= coda_evict_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;
	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];
	mutex_lock(&vc->vc_mutex);

	if (!vc->vc_inuse) {
		printk("coda_read_super: No pseudo device\n");
		error = -EINVAL;
		goto unlock_out;
	}

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

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

	vc->vc_sb = sb;
	mutex_unlock(&vc->vc_mutex);

	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) {
		error = -EINVAL;
		goto error;
	}
	return 0;

error:
	if (root)
		iput(root);

	mutex_lock(&vc->vc_mutex);
	bdi_destroy(&vc->bdi);
	vc->vc_sb = NULL;
	sb->s_fs_info = NULL;
unlock_out:
	mutex_unlock(&vc->vc_mutex);
	return error;
}

static void coda_put_super(struct super_block *sb)
{
	struct venus_comm *vcp = coda_vcp(sb);
	mutex_lock(&vcp->vc_mutex);
	bdi_destroy(&vcp->bdi);
	vcp->vc_sb = NULL;
	sb->s_fs_info = NULL;
	mutex_unlock(&vcp->vc_mutex);

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

static void coda_evict_inode(struct inode *inode)
{
	truncate_inode_pages(&inode->i_data, 0);
	end_writeback(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;

	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);
	}
	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;
	
	error = venus_statfs(dentry, buf);

	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 struct dentry *coda_mount(struct file_system_type *fs_type,
	int flags, const char *dev_name, void *data)
{
	return mount_nodev(fs_type, flags, data, coda_fill_super);
}

struct file_system_type coda_fs_type = {
	.owner		= THIS_MODULE,
	.name		= "coda",
	.mount		= coda_mount,
	.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>
da47c19e	18	#include <linux/mutex.h>
b5ce1d83	19	#include <linux/spinlock.h>
1da177e4 LT	20	#include <linux/file.h>
1da177e4 LT	21	#include <linux/vfs.h>
5a0e3ad6	22	#include <linux/slab.h>
1da177e4 LT	23
	24	#include <asm/system.h>
	25	#include <asm/uaccess.h>
	26
	27	#include <linux/fs.h>
	28	#include <linux/vmalloc.h>
	29
	30	#include <linux/coda.h>
	31	#include <linux/coda_linux.h>
	32	#include <linux/coda_psdev.h>
	33	#include <linux/coda_fs_i.h>
	34	#include <linux/coda_cache.h>
	35
c98d8cfb AB	36	#include "coda_int.h"
c98d8cfb AB	37
1da177e4	38	/* VFS super_block ops */
b57922d9	39	static void coda_evict_inode(struct inode *);
1da177e4	40	static void coda_put_super(struct super_block *);
726c3342	41	static int coda_statfs(struct dentry dentry, struct kstatfs buf);
1da177e4	42
e18b890b	43	static struct kmem_cache * coda_inode_cachep;
1da177e4 LT	44
	45	static struct inode coda_alloc_inode(struct super_block sb)
	46	{
	47	struct coda_inode_info *ei;
e94b1766	48	ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
1da177e4 LT	49	if (!ei)
	50	return NULL;
	51	memset(&ei->c_fid, 0, sizeof(struct CodaFid));
	52	ei->c_flags = 0;
	53	ei->c_uid = 0;
	54	ei->c_cached_perm = 0;
b5ce1d83	55	spin_lock_init(&ei->c_lock);
1da177e4 LT	56	return &ei->vfs_inode;
	57	}
	58
	59	static void coda_destroy_inode(struct inode *inode)
	60	{
	61	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	62	}
	63
51cc5068	64	static void init_once(void *foo)
1da177e4 LT	65	{
	66	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	67
a35afb83	68	inode_init_once(&ei->vfs_inode);
1da177e4	69	}
20c2df83	70
1da177e4 LT	71	int coda_init_inodecache(void)
	72	{
	73	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	74	sizeof(struct coda_inode_info),
4b6a9316	75	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	76	init_once);
1da177e4 LT	77	if (coda_inode_cachep == NULL)
	78	return -ENOMEM;
	79	return 0;
	80	}
	81
	82	void coda_destroy_inodecache(void)
	83	{
1a1d92c1	84	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	85	}
	86
	87	static int coda_remount(struct super_block sb, int flags, char *data)
	88	{
fac1f0e3	89	*flags \|= MS_NOATIME;
1da177e4 LT	90	return 0;
	91	}
	92
	93	/* exported operations */
ee9b6d61	94	static const struct super_operations coda_super_operations =
1da177e4 LT	95	{
	96	.alloc_inode = coda_alloc_inode,
	97	.destroy_inode = coda_destroy_inode,
b57922d9	98	.evict_inode = coda_evict_inode,
1da177e4 LT	99	.put_super = coda_put_super,
	100	.statfs = coda_statfs,
	101	.remount_fs = coda_remount,
	102	};
	103
	104	static int get_device_index(struct coda_mount_data *data)
	105	{
	106	struct file *file;
	107	struct inode *inode;
	108	int idx;
	109
	110	if(data == NULL) {
	111	printk("coda_read_super: Bad mount data\n");
	112	return -1;
	113	}
	114
	115	if(data->version != CODA_MOUNT_VERSION) {
	116	printk("coda_read_super: Bad mount version\n");
	117	return -1;
	118	}
	119
	120	file = fget(data->fd);
	121	inode = NULL;
	122	if(file)
d4176d32	123	inode = file->f_path.dentry->d_inode;
1da177e4 LT	124
	125	if(!inode \|\| !S_ISCHR(inode->i_mode) \|\|
	126	imajor(inode) != CODA_PSDEV_MAJOR) {
	127	if(file)
	128	fput(file);
	129
	130	printk("coda_read_super: Bad file\n");
	131	return -1;
	132	}
	133
	134	idx = iminor(inode);
	135	fput(file);
	136
	137	if(idx < 0 \|\| idx >= MAX_CODADEVS) {
	138	printk("coda_read_super: Bad minor number\n");
	139	return -1;
	140	}
	141
	142	return idx;
	143	}
	144
	145	static int coda_fill_super(struct super_block sb, void data, int silent)
	146	{
a1b0aa87	147	struct inode *root = NULL;
da47c19e	148	struct venus_comm *vc;
1da177e4	149	struct CodaFid fid;
a1b0aa87	150	int error;
1da177e4 LT	151	int idx;
	152
	153	idx = get_device_index((struct coda_mount_data *) data);
	154
	155	/* Ignore errors in data, for backward compatibility */
	156	if(idx == -1)
	157	idx = 0;
	158
	159	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	160
	161	vc = &coda_comms[idx];
da47c19e	162	mutex_lock(&vc->vc_mutex);
f7cc02b8	163
1da177e4 LT	164	if (!vc->vc_inuse) {
1da177e4 LT	165	printk("coda_read_super: No pseudo device\n");
f7cc02b8 YA	166	error = -EINVAL;
f7cc02b8 YA	167	goto unlock_out;
1da177e4 LT	168	}
1da177e4 LT	169
f7cc02b8	170	if (vc->vc_sb) {
1da177e4	171	printk("coda_read_super: Device already mounted\n");
f7cc02b8 YA	172	error = -EBUSY;
f7cc02b8 YA	173	goto unlock_out;
1da177e4 LT	174	}
1da177e4 LT	175
5163d900 JA	176	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
5163d900 JA	177	if (error)
f7cc02b8	178	goto unlock_out;
5163d900	179
1da177e4	180	vc->vc_sb = sb;
da47c19e	181	mutex_unlock(&vc->vc_mutex);
1da177e4	182
a1b0aa87	183	sb->s_fs_info = vc;
fac1f0e3 JH	184	sb->s_flags \|= MS_NOATIME;
	185	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	186	sb->s_blocksize_bits = 12;
	187	sb->s_magic = CODA_SUPER_MAGIC;
	188	sb->s_op = &coda_super_operations;
5163d900	189	sb->s_bdi = &vc->bdi;
1da177e4 LT	190
	191	/* get root fid from Venus: this needs the root inode */
	192	error = venus_rootfid(sb, &fid);
	193	if ( error ) {
	194	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	195	error);
	196	goto error;
	197	}
	198	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	199
	200	/* make root inode */
	201	error = coda_cnode_make(&root, &fid, sb);
	202	if ( error \|\| !root ) {
	203	printk("Failure of coda_cnode_make for root: error %d\n", error);
	204	goto error;
	205	}
	206
	207	printk("coda_read_super: rootinode is %ld dev %s\n",
	208	root->i_ino, root->i_sb->s_id);
	209	sb->s_root = d_alloc_root(root);
f7cc02b8 YA	210	if (!sb->s_root) {
f7cc02b8 YA	211	error = -EINVAL;
1da177e4	212	goto error;
f7cc02b8	213	}
db719222	214	return 0;
1da177e4	215
f7cc02b8	216	error:
1da177e4	217	if (root)
a1b0aa87	218	iput(root);
1da177e4	219
da47c19e	220	mutex_lock(&vc->vc_mutex);
f7cc02b8 YA	221	bdi_destroy(&vc->bdi);
	222	vc->vc_sb = NULL;
	223	sb->s_fs_info = NULL;
	224	unlock_out:
da47c19e	225	mutex_unlock(&vc->vc_mutex);
f7cc02b8	226	return error;
1da177e4 LT	227	}
	228
	229	static void coda_put_super(struct super_block *sb)
	230	{
da47c19e YA	231	struct venus_comm *vcp = coda_vcp(sb);
	232	mutex_lock(&vcp->vc_mutex);
	233	bdi_destroy(&vcp->bdi);
	234	vcp->vc_sb = NULL;
a1b0aa87	235	sb->s_fs_info = NULL;
da47c19e	236	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	237
1da177e4 LT	238	printk("Coda: Bye bye.\n");
1da177e4 LT	239	}
1da177e4 LT	240
b57922d9	241	static void coda_evict_inode(struct inode *inode)
1da177e4	242	{
b57922d9 AV	243	truncate_inode_pages(&inode->i_data, 0);
b57922d9 AV	244	end_writeback(inode);
1da177e4 LT	245	coda_cache_clear_inode(inode);
	246	}
	247
	248	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	249	{
	250	int err = coda_revalidate_inode(dentry);
	251	if (!err)
	252	generic_fillattr(dentry->d_inode, stat);
	253	return err;
	254	}
	255
	256	int coda_setattr(struct dentry de, struct iattr iattr)
	257	{
	258	struct inode *inode = de->d_inode;
	259	struct coda_vattr vattr;
	260	int error;
	261
1da177e4 LT	262	memset(&vattr, 0, sizeof(vattr));
	263
	264	inode->i_ctime = CURRENT_TIME_SEC;
	265	coda_iattr_to_vattr(iattr, &vattr);
	266	vattr.va_type = C_VNON; /* cannot set type */
	267
	268	/* Venus is responsible for truncating the container-file!!! */
	269	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	270
f7cc02b8	271	if (!error) {
1da177e4 LT	272	coda_vattr_to_iattr(inode, &vattr);
	273	coda_cache_clear_inode(inode);
	274	}
1da177e4 LT	275	return error;
	276	}
	277
754661f1	278	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	279	.permission = coda_permission,
	280	.getattr = coda_getattr,
	281	.setattr = coda_setattr,
	282	};
	283
726c3342	284	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	285	{
	286	int error;
	287
726c3342	288	error = venus_statfs(dentry, buf);
1da177e4	289
1da177e4 LT	290	if (error) {
	291	/* fake something like AFS does */
	292	buf->f_blocks = 9000000;
	293	buf->f_bfree = 9000000;
	294	buf->f_bavail = 9000000;
	295	buf->f_files = 9000000;
	296	buf->f_ffree = 9000000;
	297	}
	298
	299	/* and fill in the rest */
	300	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	301	buf->f_bsize = 4096;
1da177e4 LT	302	buf->f_namelen = CODA_MAXNAMLEN;
	303
	304	return 0;
	305	}
	306
	307	/* init_coda: used by filesystems.c to register coda */
	308
3c26ff6e AV	309	static struct dentry coda_mount(struct file_system_type fs_type,
3c26ff6e AV	310	int flags, const char dev_name, void data)
1da177e4	311	{
3c26ff6e	312	return mount_nodev(fs_type, flags, data, coda_fill_super);
1da177e4 LT	313	}
	314
	315	struct file_system_type coda_fs_type = {
	316	.owner = THIS_MODULE,
	317	.name = "coda",
3c26ff6e	318	.mount = coda_mount,
1da177e4 LT	319	.kill_sb = kill_anon_super,
	320	.fs_flags = FS_BINARY_MOUNTDATA,
	321	};
	322