[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/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_psdev.h>
#include "coda_linux.h"
#include "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 = 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_i_callback(struct rcu_head *head)
{
	struct inode *inode = container_of(head, struct inode, i_rcu);
	INIT_LIST_HEAD(&inode->i_dentry);
	kmem_cache_free(coda_inode_cachep, ITOC(inode));
}

static void coda_destroy_inode(struct inode *inode)
{
	call_rcu(&inode->i_rcu, coda_i_callback);
}

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_d_op = &coda_dentry_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>
1da177e4	31	#include <linux/coda_psdev.h>
31a203df AV	32	#include "coda_linux.h"
31a203df AV	33	#include "coda_cache.h"
1da177e4	34
c98d8cfb AB	35	#include "coda_int.h"
c98d8cfb AB	36
1da177e4	37	/* VFS super_block ops */
b57922d9	38	static void coda_evict_inode(struct inode *);
1da177e4	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;
747fecab	47	ei = 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;
b5ce1d83	54	spin_lock_init(&ei->c_lock);
1da177e4 LT	55	return &ei->vfs_inode;
	56	}
	57
fa0d7e3d	58	static void coda_i_callback(struct rcu_head *head)
1da177e4	59	{
fa0d7e3d NP	60	struct inode *inode = container_of(head, struct inode, i_rcu);
fa0d7e3d NP	61	INIT_LIST_HEAD(&inode->i_dentry);
1da177e4 LT	62	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	63	}
	64
fa0d7e3d NP	65	static void coda_destroy_inode(struct inode *inode)
	66	{
	67	call_rcu(&inode->i_rcu, coda_i_callback);
	68	}
	69
51cc5068	70	static void init_once(void *foo)
1da177e4 LT	71	{
	72	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	73
a35afb83	74	inode_init_once(&ei->vfs_inode);
1da177e4	75	}
20c2df83	76
1da177e4 LT	77	int coda_init_inodecache(void)
	78	{
	79	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	80	sizeof(struct coda_inode_info),
4b6a9316	81	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	82	init_once);
1da177e4 LT	83	if (coda_inode_cachep == NULL)
	84	return -ENOMEM;
	85	return 0;
	86	}
	87
	88	void coda_destroy_inodecache(void)
	89	{
1a1d92c1	90	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	91	}
	92
	93	static int coda_remount(struct super_block sb, int flags, char *data)
	94	{
fac1f0e3	95	*flags \|= MS_NOATIME;
1da177e4 LT	96	return 0;
	97	}
	98
	99	/* exported operations */
ee9b6d61	100	static const struct super_operations coda_super_operations =
1da177e4 LT	101	{
	102	.alloc_inode = coda_alloc_inode,
	103	.destroy_inode = coda_destroy_inode,
b57922d9	104	.evict_inode = coda_evict_inode,
1da177e4 LT	105	.put_super = coda_put_super,
	106	.statfs = coda_statfs,
	107	.remount_fs = coda_remount,
	108	};
	109
	110	static int get_device_index(struct coda_mount_data *data)
	111	{
	112	struct file *file;
	113	struct inode *inode;
	114	int idx;
	115
	116	if(data == NULL) {
	117	printk("coda_read_super: Bad mount data\n");
	118	return -1;
	119	}
	120
	121	if(data->version != CODA_MOUNT_VERSION) {
	122	printk("coda_read_super: Bad mount version\n");
	123	return -1;
	124	}
	125
	126	file = fget(data->fd);
	127	inode = NULL;
	128	if(file)
d4176d32	129	inode = file->f_path.dentry->d_inode;
1da177e4 LT	130
	131	if(!inode \|\| !S_ISCHR(inode->i_mode) \|\|
	132	imajor(inode) != CODA_PSDEV_MAJOR) {
	133	if(file)
	134	fput(file);
	135
	136	printk("coda_read_super: Bad file\n");
	137	return -1;
	138	}
	139
	140	idx = iminor(inode);
	141	fput(file);
	142
	143	if(idx < 0 \|\| idx >= MAX_CODADEVS) {
	144	printk("coda_read_super: Bad minor number\n");
	145	return -1;
	146	}
	147
	148	return idx;
	149	}
	150
	151	static int coda_fill_super(struct super_block sb, void data, int silent)
	152	{
a1b0aa87	153	struct inode *root = NULL;
da47c19e	154	struct venus_comm *vc;
1da177e4	155	struct CodaFid fid;
a1b0aa87	156	int error;
1da177e4 LT	157	int idx;
	158
	159	idx = get_device_index((struct coda_mount_data *) data);
	160
	161	/* Ignore errors in data, for backward compatibility */
	162	if(idx == -1)
	163	idx = 0;
	164
	165	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	166
	167	vc = &coda_comms[idx];
da47c19e	168	mutex_lock(&vc->vc_mutex);
f7cc02b8	169
1da177e4 LT	170	if (!vc->vc_inuse) {
1da177e4 LT	171	printk("coda_read_super: No pseudo device\n");
f7cc02b8 YA	172	error = -EINVAL;
f7cc02b8 YA	173	goto unlock_out;
1da177e4 LT	174	}
1da177e4 LT	175
f7cc02b8	176	if (vc->vc_sb) {
1da177e4	177	printk("coda_read_super: Device already mounted\n");
f7cc02b8 YA	178	error = -EBUSY;
f7cc02b8 YA	179	goto unlock_out;
1da177e4 LT	180	}
1da177e4 LT	181
5163d900 JA	182	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
5163d900 JA	183	if (error)
f7cc02b8	184	goto unlock_out;
5163d900	185
1da177e4	186	vc->vc_sb = sb;
da47c19e	187	mutex_unlock(&vc->vc_mutex);
1da177e4	188
a1b0aa87	189	sb->s_fs_info = vc;
fac1f0e3 JH	190	sb->s_flags \|= MS_NOATIME;
	191	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	192	sb->s_blocksize_bits = 12;
	193	sb->s_magic = CODA_SUPER_MAGIC;
	194	sb->s_op = &coda_super_operations;
9501e4c4	195	sb->s_d_op = &coda_dentry_operations;
5163d900	196	sb->s_bdi = &vc->bdi;
1da177e4 LT	197
	198	/* get root fid from Venus: this needs the root inode */
	199	error = venus_rootfid(sb, &fid);
	200	if ( error ) {
	201	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	202	error);
	203	goto error;
	204	}
	205	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	206
	207	/* make root inode */
	208	error = coda_cnode_make(&root, &fid, sb);
	209	if ( error \|\| !root ) {
	210	printk("Failure of coda_cnode_make for root: error %d\n", error);
	211	goto error;
	212	}
	213
	214	printk("coda_read_super: rootinode is %ld dev %s\n",
	215	root->i_ino, root->i_sb->s_id);
	216	sb->s_root = d_alloc_root(root);
f7cc02b8 YA	217	if (!sb->s_root) {
f7cc02b8 YA	218	error = -EINVAL;
1da177e4	219	goto error;
f7cc02b8	220	}
db719222	221	return 0;
1da177e4	222
f7cc02b8	223	error:
1da177e4	224	if (root)
a1b0aa87	225	iput(root);
1da177e4	226
da47c19e	227	mutex_lock(&vc->vc_mutex);
f7cc02b8 YA	228	bdi_destroy(&vc->bdi);
	229	vc->vc_sb = NULL;
	230	sb->s_fs_info = NULL;
	231	unlock_out:
da47c19e	232	mutex_unlock(&vc->vc_mutex);
f7cc02b8	233	return error;
1da177e4 LT	234	}
	235
	236	static void coda_put_super(struct super_block *sb)
	237	{
da47c19e YA	238	struct venus_comm *vcp = coda_vcp(sb);
	239	mutex_lock(&vcp->vc_mutex);
	240	bdi_destroy(&vcp->bdi);
	241	vcp->vc_sb = NULL;
a1b0aa87	242	sb->s_fs_info = NULL;
da47c19e	243	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	244
1da177e4 LT	245	printk("Coda: Bye bye.\n");
1da177e4 LT	246	}
1da177e4 LT	247
b57922d9	248	static void coda_evict_inode(struct inode *inode)
1da177e4	249	{
b57922d9 AV	250	truncate_inode_pages(&inode->i_data, 0);
b57922d9 AV	251	end_writeback(inode);
1da177e4 LT	252	coda_cache_clear_inode(inode);
	253	}
	254
	255	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	256	{
	257	int err = coda_revalidate_inode(dentry);
	258	if (!err)
	259	generic_fillattr(dentry->d_inode, stat);
	260	return err;
	261	}
	262
	263	int coda_setattr(struct dentry de, struct iattr iattr)
	264	{
	265	struct inode *inode = de->d_inode;
	266	struct coda_vattr vattr;
	267	int error;
	268
1da177e4 LT	269	memset(&vattr, 0, sizeof(vattr));
	270
	271	inode->i_ctime = CURRENT_TIME_SEC;
	272	coda_iattr_to_vattr(iattr, &vattr);
	273	vattr.va_type = C_VNON; /* cannot set type */
	274
	275	/* Venus is responsible for truncating the container-file!!! */
	276	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	277
f7cc02b8	278	if (!error) {
1da177e4 LT	279	coda_vattr_to_iattr(inode, &vattr);
	280	coda_cache_clear_inode(inode);
	281	}
1da177e4 LT	282	return error;
	283	}
	284
754661f1	285	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	286	.permission = coda_permission,
	287	.getattr = coda_getattr,
	288	.setattr = coda_setattr,
	289	};
	290
726c3342	291	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	292	{
	293	int error;
	294
726c3342	295	error = venus_statfs(dentry, buf);
1da177e4	296
1da177e4 LT	297	if (error) {
	298	/* fake something like AFS does */
	299	buf->f_blocks = 9000000;
	300	buf->f_bfree = 9000000;
	301	buf->f_bavail = 9000000;
	302	buf->f_files = 9000000;
	303	buf->f_ffree = 9000000;
	304	}
	305
	306	/* and fill in the rest */
	307	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	308	buf->f_bsize = 4096;
1da177e4 LT	309	buf->f_namelen = CODA_MAXNAMLEN;
	310
	311	return 0;
	312	}
	313
	314	/* init_coda: used by filesystems.c to register coda */
	315
3c26ff6e AV	316	static struct dentry coda_mount(struct file_system_type fs_type,
3c26ff6e AV	317	int flags, const char dev_name, void data)
1da177e4	318	{
3c26ff6e	319	return mount_nodev(fs_type, flags, data, coda_fill_super);
1da177e4 LT	320	}
	321
	322	struct file_system_type coda_fs_type = {
	323	.owner = THIS_MODULE,
	324	.name = "coda",
3c26ff6e	325	.mount = coda_mount,
1da177e4 LT	326	.kill_sb = kill_anon_super,
	327	.fs_flags = FS_BINARY_MOUNTDATA,
	328	};
	329