[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 <linux/pid_namespace.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 = GLOBAL_ROOT_UID;
	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);
	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 __init 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)
{
	/*
	 * Make sure all delayed rcu free inodes are flushed before we
	 * destroy cache.
	 */
	rcu_barrier();
	kmem_cache_destroy(coda_inode_cachep);
}

static int coda_remount(struct super_block *sb, int *flags, char *data)
{
	sync_filesystem(sb);
	*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 fd f;
	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;
	}

	f = fdget(data->fd);
	if (!f.file)
		goto Ebadf;
	inode = file_inode(f.file);
	if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
		fdput(f);
		goto Ebadf;
	}

	idx = iminor(inode);
	fdput(f);

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

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

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;

	if (task_active_pid_ns(current) != &init_pid_ns)
		return -EINVAL;

	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 */
        root = coda_cnode_make(&fid, sb);
        if (IS_ERR(root)) {
		error = PTR_ERR(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_make_root(root);
	if (!sb->s_root) {
		error = -EINVAL;
		goto error;
	}
	return 0;

error:
	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_final(&inode->i_data);
	clear_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->d_inode);
	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,
};
MODULE_ALIAS_FS("coda");
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>
9fd973e0	23	#include <linux/pid_namespace.h>
1da177e4	24
1da177e4 LT	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;
17499e33	52	ei->c_uid = GLOBAL_ROOT_UID;
1da177e4	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	60	struct inode *inode = container_of(head, struct inode, i_rcu);
1da177e4 LT	61	kmem_cache_free(coda_inode_cachep, ITOC(inode));
	62	}
	63
fa0d7e3d NP	64	static void coda_destroy_inode(struct inode *inode)
	65	{
	66	call_rcu(&inode->i_rcu, coda_i_callback);
	67	}
	68
51cc5068	69	static void init_once(void *foo)
1da177e4 LT	70	{
	71	struct coda_inode_info ei = (struct coda_inode_info ) foo;
	72
a35afb83	73	inode_init_once(&ei->vfs_inode);
1da177e4	74	}
20c2df83	75
5f356fd4	76	int __init coda_init_inodecache(void)
1da177e4 LT	77	{
	78	coda_inode_cachep = kmem_cache_create("coda_inode_cache",
	79	sizeof(struct coda_inode_info),
4b6a9316	80	0, SLAB_RECLAIM_ACCOUNT\|SLAB_MEM_SPREAD,
20c2df83	81	init_once);
1da177e4 LT	82	if (coda_inode_cachep == NULL)
	83	return -ENOMEM;
	84	return 0;
	85	}
	86
	87	void coda_destroy_inodecache(void)
	88	{
8c0a8537 KS	89	/*
	90	* Make sure all delayed rcu free inodes are flushed before we
	91	* destroy cache.
	92	*/
	93	rcu_barrier();
1a1d92c1	94	kmem_cache_destroy(coda_inode_cachep);
1da177e4 LT	95	}
	96
	97	static int coda_remount(struct super_block sb, int flags, char *data)
	98	{
02b9984d	99	sync_filesystem(sb);
fac1f0e3	100	*flags \|= MS_NOATIME;
1da177e4 LT	101	return 0;
	102	}
	103
	104	/* exported operations */
ee9b6d61	105	static const struct super_operations coda_super_operations =
1da177e4 LT	106	{
	107	.alloc_inode = coda_alloc_inode,
	108	.destroy_inode = coda_destroy_inode,
b57922d9	109	.evict_inode = coda_evict_inode,
1da177e4 LT	110	.put_super = coda_put_super,
	111	.statfs = coda_statfs,
	112	.remount_fs = coda_remount,
	113	};
	114
	115	static int get_device_index(struct coda_mount_data *data)
	116	{
2903ff01	117	struct fd f;
1da177e4	118	struct inode *inode;
2903ff01	119	int idx;
1da177e4	120
78f7d75e	121	if (data == NULL) {
1da177e4 LT	122	printk("coda_read_super: Bad mount data\n");
	123	return -1;
	124	}
	125
78f7d75e	126	if (data->version != CODA_MOUNT_VERSION) {
1da177e4 LT	127	printk("coda_read_super: Bad mount version\n");
	128	return -1;
	129	}
	130
2903ff01 AV	131	f = fdget(data->fd);
2903ff01 AV	132	if (!f.file)
78f7d75e	133	goto Ebadf;
496ad9aa	134	inode = file_inode(f.file);
78f7d75e	135	if (!S_ISCHR(inode->i_mode) \|\| imajor(inode) != CODA_PSDEV_MAJOR) {
2903ff01	136	fdput(f);
78f7d75e	137	goto Ebadf;
1da177e4 LT	138	}
	139
	140	idx = iminor(inode);
2903ff01	141	fdput(f);
1da177e4	142
78f7d75e	143	if (idx < 0 \|\| idx >= MAX_CODADEVS) {
1da177e4 LT	144	printk("coda_read_super: Bad minor number\n");
	145	return -1;
	146	}
	147
	148	return idx;
78f7d75e AV	149	Ebadf:
	150	printk("coda_read_super: Bad file\n");
	151	return -1;
1da177e4 LT	152	}
	153
	154	static int coda_fill_super(struct super_block sb, void data, int silent)
	155	{
a1b0aa87	156	struct inode *root = NULL;
da47c19e	157	struct venus_comm *vc;
1da177e4	158	struct CodaFid fid;
a1b0aa87	159	int error;
1da177e4 LT	160	int idx;
1da177e4 LT	161
9fd973e0 EB	162	if (task_active_pid_ns(current) != &init_pid_ns)
	163	return -EINVAL;
	164
1da177e4 LT	165	idx = get_device_index((struct coda_mount_data *) data);
	166
	167	/* Ignore errors in data, for backward compatibility */
	168	if(idx == -1)
	169	idx = 0;
	170
	171	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	172
	173	vc = &coda_comms[idx];
da47c19e	174	mutex_lock(&vc->vc_mutex);
f7cc02b8	175
1da177e4 LT	176	if (!vc->vc_inuse) {
1da177e4 LT	177	printk("coda_read_super: No pseudo device\n");
f7cc02b8 YA	178	error = -EINVAL;
f7cc02b8 YA	179	goto unlock_out;
1da177e4 LT	180	}
1da177e4 LT	181
f7cc02b8	182	if (vc->vc_sb) {
1da177e4	183	printk("coda_read_super: Device already mounted\n");
f7cc02b8 YA	184	error = -EBUSY;
f7cc02b8 YA	185	goto unlock_out;
1da177e4 LT	186	}
1da177e4 LT	187
5163d900 JA	188	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
5163d900 JA	189	if (error)
f7cc02b8	190	goto unlock_out;
5163d900	191
1da177e4	192	vc->vc_sb = sb;
da47c19e	193	mutex_unlock(&vc->vc_mutex);
1da177e4	194
a1b0aa87	195	sb->s_fs_info = vc;
fac1f0e3 JH	196	sb->s_flags \|= MS_NOATIME;
	197	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	198	sb->s_blocksize_bits = 12;
	199	sb->s_magic = CODA_SUPER_MAGIC;
	200	sb->s_op = &coda_super_operations;
9501e4c4	201	sb->s_d_op = &coda_dentry_operations;
5163d900	202	sb->s_bdi = &vc->bdi;
1da177e4 LT	203
	204	/* get root fid from Venus: this needs the root inode */
	205	error = venus_rootfid(sb, &fid);
	206	if ( error ) {
	207	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	208	error);
	209	goto error;
	210	}
	211	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	212
	213	/* make root inode */
f4947fbc AV	214	root = coda_cnode_make(&fid, sb);
	215	if (IS_ERR(root)) {
	216	error = PTR_ERR(root);
	217	printk("Failure of coda_cnode_make for root: error %d\n", error);
f4947fbc	218	goto error;
1da177e4 LT	219	}
	220
	221	printk("coda_read_super: rootinode is %ld dev %s\n",
	222	root->i_ino, root->i_sb->s_id);
48fde701	223	sb->s_root = d_make_root(root);
f7cc02b8 YA	224	if (!sb->s_root) {
f7cc02b8 YA	225	error = -EINVAL;
1da177e4	226	goto error;
f7cc02b8	227	}
db719222	228	return 0;
1da177e4	229
f7cc02b8	230	error:
da47c19e	231	mutex_lock(&vc->vc_mutex);
f7cc02b8 YA	232	bdi_destroy(&vc->bdi);
	233	vc->vc_sb = NULL;
	234	sb->s_fs_info = NULL;
	235	unlock_out:
da47c19e	236	mutex_unlock(&vc->vc_mutex);
f7cc02b8	237	return error;
1da177e4 LT	238	}
	239
	240	static void coda_put_super(struct super_block *sb)
	241	{
da47c19e YA	242	struct venus_comm *vcp = coda_vcp(sb);
	243	mutex_lock(&vcp->vc_mutex);
	244	bdi_destroy(&vcp->bdi);
	245	vcp->vc_sb = NULL;
a1b0aa87	246	sb->s_fs_info = NULL;
da47c19e	247	mutex_unlock(&vcp->vc_mutex);
1da177e4 LT	248
1da177e4 LT	249	printk("Coda: Bye bye.\n");
1da177e4 LT	250	}
1da177e4 LT	251
b57922d9	252	static void coda_evict_inode(struct inode *inode)
1da177e4	253	{
91b0abe3	254	truncate_inode_pages_final(&inode->i_data);
dbd5768f	255	clear_inode(inode);
1da177e4 LT	256	coda_cache_clear_inode(inode);
	257	}
	258
	259	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	260	{
11d100d9	261	int err = coda_revalidate_inode(dentry->d_inode);
1da177e4 LT	262	if (!err)
	263	generic_fillattr(dentry->d_inode, stat);
	264	return err;
	265	}
	266
	267	int coda_setattr(struct dentry de, struct iattr iattr)
	268	{
	269	struct inode *inode = de->d_inode;
	270	struct coda_vattr vattr;
	271	int error;
	272
1da177e4 LT	273	memset(&vattr, 0, sizeof(vattr));
	274
	275	inode->i_ctime = CURRENT_TIME_SEC;
	276	coda_iattr_to_vattr(iattr, &vattr);
	277	vattr.va_type = C_VNON; /* cannot set type */
	278
	279	/* Venus is responsible for truncating the container-file!!! */
	280	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	281
f7cc02b8	282	if (!error) {
1da177e4 LT	283	coda_vattr_to_iattr(inode, &vattr);
	284	coda_cache_clear_inode(inode);
	285	}
1da177e4 LT	286	return error;
	287	}
	288
754661f1	289	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	290	.permission = coda_permission,
	291	.getattr = coda_getattr,
	292	.setattr = coda_setattr,
	293	};
	294
726c3342	295	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	296	{
	297	int error;
	298
726c3342	299	error = venus_statfs(dentry, buf);
1da177e4	300
1da177e4 LT	301	if (error) {
	302	/* fake something like AFS does */
	303	buf->f_blocks = 9000000;
	304	buf->f_bfree = 9000000;
	305	buf->f_bavail = 9000000;
	306	buf->f_files = 9000000;
	307	buf->f_ffree = 9000000;
	308	}
	309
	310	/* and fill in the rest */
	311	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	312	buf->f_bsize = 4096;
1da177e4 LT	313	buf->f_namelen = CODA_MAXNAMLEN;
	314
	315	return 0;
	316	}
	317
	318	/* init_coda: used by filesystems.c to register coda */
	319
3c26ff6e AV	320	static struct dentry coda_mount(struct file_system_type fs_type,
3c26ff6e AV	321	int flags, const char dev_name, void data)
1da177e4	322	{
3c26ff6e	323	return mount_nodev(fs_type, flags, data, coda_fill_super);
1da177e4 LT	324	}
	325
	326	struct file_system_type coda_fs_type = {
	327	.owner = THIS_MODULE,
	328	.name = "coda",
3c26ff6e	329	.mount = coda_mount,
1da177e4 LT	330	.kill_sb = kill_anon_super,
	331	.fs_flags = FS_BINARY_MOUNTDATA,
	332	};
7f78e035	333	MODULE_ALIAS_FS("coda");
1da177e4	334