[mirror_ubuntu-zesty-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/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 = NULL;
	struct CodaFid fid;
	int error;
	int idx;

	lock_kernel();

	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");
		unlock_kernel();
		return -EINVAL;
	}

        if ( vc->vc_sb ) {
		printk("coda_read_super: Device already mounted\n");
		unlock_kernel();
		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;
	unlock_kernel();
	return 0;

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

	unlock_kernel();
	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_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;

	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>
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;
1da177e4 LT	148	struct venus_comm *vc = NULL;
1da177e4 LT	149	struct CodaFid fid;
a1b0aa87	150	int error;
1da177e4 LT	151	int idx;
1da177e4 LT	152
db719222 JB	153	lock_kernel();
db719222 JB	154
1da177e4 LT	155	idx = get_device_index((struct coda_mount_data *) data);
	156
	157	/* Ignore errors in data, for backward compatibility */
	158	if(idx == -1)
	159	idx = 0;
	160
	161	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
	162
	163	vc = &coda_comms[idx];
	164	if (!vc->vc_inuse) {
	165	printk("coda_read_super: No pseudo device\n");
db719222	166	unlock_kernel();
1da177e4 LT	167	return -EINVAL;
	168	}
	169
	170	if ( vc->vc_sb ) {
	171	printk("coda_read_super: Device already mounted\n");
db719222	172	unlock_kernel();
1da177e4 LT	173	return -EBUSY;
	174	}
	175
5163d900 JA	176	error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
	177	if (error)
	178	goto bdi_err;
	179
1da177e4 LT	180	vc->vc_sb = sb;
1da177e4 LT	181
a1b0aa87	182	sb->s_fs_info = vc;
fac1f0e3 JH	183	sb->s_flags \|= MS_NOATIME;
	184	sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
	185	sb->s_blocksize_bits = 12;
	186	sb->s_magic = CODA_SUPER_MAGIC;
	187	sb->s_op = &coda_super_operations;
5163d900	188	sb->s_bdi = &vc->bdi;
1da177e4 LT	189
	190	/* get root fid from Venus: this needs the root inode */
	191	error = venus_rootfid(sb, &fid);
	192	if ( error ) {
	193	printk("coda_read_super: coda_get_rootfid failed with %d\n",
	194	error);
	195	goto error;
	196	}
	197	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
	198
	199	/* make root inode */
	200	error = coda_cnode_make(&root, &fid, sb);
	201	if ( error \|\| !root ) {
	202	printk("Failure of coda_cnode_make for root: error %d\n", error);
	203	goto error;
	204	}
	205
	206	printk("coda_read_super: rootinode is %ld dev %s\n",
	207	root->i_ino, root->i_sb->s_id);
	208	sb->s_root = d_alloc_root(root);
	209	if (!sb->s_root)
	210	goto error;
db719222 JB	211	unlock_kernel();
db719222 JB	212	return 0;
1da177e4 LT	213
1da177e4 LT	214	error:
5163d900 JA	215	bdi_destroy(&vc->bdi);
5163d900 JA	216	bdi_err:
1da177e4	217	if (root)
a1b0aa87 JH	218	iput(root);
	219	if (vc)
	220	vc->vc_sb = NULL;
1da177e4	221
db719222	222	unlock_kernel();
a1b0aa87	223	return -EINVAL;
1da177e4 LT	224	}
	225
	226	static void coda_put_super(struct super_block *sb)
	227	{
5163d900	228	bdi_destroy(&coda_vcp(sb)->bdi);
a1b0aa87 JH	229	coda_vcp(sb)->vc_sb = NULL;
a1b0aa87 JH	230	sb->s_fs_info = NULL;
1da177e4 LT	231
1da177e4 LT	232	printk("Coda: Bye bye.\n");
1da177e4 LT	233	}
1da177e4 LT	234
b57922d9	235	static void coda_evict_inode(struct inode *inode)
1da177e4	236	{
b57922d9 AV	237	truncate_inode_pages(&inode->i_data, 0);
b57922d9 AV	238	end_writeback(inode);
1da177e4 LT	239	coda_cache_clear_inode(inode);
	240	}
	241
	242	int coda_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	243	{
	244	int err = coda_revalidate_inode(dentry);
	245	if (!err)
	246	generic_fillattr(dentry->d_inode, stat);
	247	return err;
	248	}
	249
	250	int coda_setattr(struct dentry de, struct iattr iattr)
	251	{
	252	struct inode *inode = de->d_inode;
	253	struct coda_vattr vattr;
	254	int error;
	255
	256	lock_kernel();
	257
	258	memset(&vattr, 0, sizeof(vattr));
	259
	260	inode->i_ctime = CURRENT_TIME_SEC;
	261	coda_iattr_to_vattr(iattr, &vattr);
	262	vattr.va_type = C_VNON; /* cannot set type */
	263
	264	/* Venus is responsible for truncating the container-file!!! */
	265	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
	266
	267	if ( !error ) {
	268	coda_vattr_to_iattr(inode, &vattr);
	269	coda_cache_clear_inode(inode);
	270	}
	271
	272	unlock_kernel();
	273
	274	return error;
	275	}
	276
754661f1	277	const struct inode_operations coda_file_inode_operations = {
1da177e4 LT	278	.permission = coda_permission,
	279	.getattr = coda_getattr,
	280	.setattr = coda_setattr,
	281	};
	282
726c3342	283	static int coda_statfs(struct dentry dentry, struct kstatfs buf)
1da177e4 LT	284	{
	285	int error;
	286
	287	lock_kernel();
	288
726c3342	289	error = venus_statfs(dentry, buf);
1da177e4 LT	290
	291	unlock_kernel();
	292
	293	if (error) {
	294	/* fake something like AFS does */
	295	buf->f_blocks = 9000000;
	296	buf->f_bfree = 9000000;
	297	buf->f_bavail = 9000000;
	298	buf->f_files = 9000000;
	299	buf->f_ffree = 9000000;
	300	}
	301
	302	/* and fill in the rest */
	303	buf->f_type = CODA_SUPER_MAGIC;
fac1f0e3	304	buf->f_bsize = 4096;
1da177e4 LT	305	buf->f_namelen = CODA_MAXNAMLEN;
	306
	307	return 0;
	308	}
	309
	310	/* init_coda: used by filesystems.c to register coda */
	311
454e2398 DH	312	static int coda_get_sb(struct file_system_type *fs_type,
454e2398 DH	313	int flags, const char dev_name, void data, struct vfsmount *mnt)
1da177e4	314	{
454e2398	315	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
1da177e4 LT	316	}
	317
	318	struct file_system_type coda_fs_type = {
	319	.owner = THIS_MODULE,
	320	.name = "coda",
	321	.get_sb = coda_get_sb,
	322	.kill_sb = kill_anon_super,
	323	.fs_flags = FS_BINARY_MOUNTDATA,
	324	};
	325