Release 4.10 fs/jffs2/fs.c

/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */


#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/mtd/mtd.h>
#include <linux/pagemap.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/vfs.h>
#include <linux/crc32.h>
#include "nodelist.h"

static int jffs2_flash_setup(struct jffs2_sb_info *c);



int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
{
	struct jffs2_full_dnode *old_metadata, *new_metadata;
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_raw_inode *ri;
	union jffs2_device_node dev;
	unsigned char *mdata = NULL;
	int mdatalen = 0;
	unsigned int ivalid;
	uint32_t alloclen;
	int ret;
	int alloc_type = ALLOC_NORMAL;

	jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino);

	/* Special cases - we don't want more than one data node
           for these types on the medium at any time. So setattr
           must read the original data associated with the node
           (i.e. the device numbers or the target name) and write
           it out again with the appropriate data attached */
	if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
		/* For these, we don't actually need to read the old node */
		mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
		mdata = (char *)&dev;
		jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n",
			  __func__, mdatalen);
	} else if (S_ISLNK(inode->i_mode)) {
		mutex_lock(&f->sem);
		mdatalen = f->metadata->size;
		mdata = kmalloc(f->metadata->size, GFP_USER);
		if (!mdata) {
			mutex_unlock(&f->sem);
			return -ENOMEM;
		}
		ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
		if (ret) {
			mutex_unlock(&f->sem);
			kfree(mdata);
			return ret;
		}
		mutex_unlock(&f->sem);
		jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n",
			  __func__, mdatalen);
	}

	ri = jffs2_alloc_raw_inode();
	if (!ri) {
		if (S_ISLNK(inode->i_mode))
			kfree(mdata);
		return -ENOMEM;
	}

	ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
				  ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
	if (ret) {
		jffs2_free_raw_inode(ri);
		if (S_ISLNK(inode->i_mode))
			 kfree(mdata);
		return ret;
	}
	mutex_lock(&f->sem);
	ivalid = iattr->ia_valid;

	ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
	ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
	ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
	ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));

	ri->ino = cpu_to_je32(inode->i_ino);
	ri->version = cpu_to_je32(++f->highest_version);

	ri->uid = cpu_to_je16((ivalid & ATTR_UID)?
		from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode));
	ri->gid = cpu_to_je16((ivalid & ATTR_GID)?
		from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode));

	if (ivalid & ATTR_MODE)
		ri->mode = cpu_to_jemode(iattr->ia_mode);
	else
		ri->mode = cpu_to_jemode(inode->i_mode);


	ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
	ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
	ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
	ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));

	ri->offset = cpu_to_je32(0);
	ri->csize = ri->dsize = cpu_to_je32(mdatalen);
	ri->compr = JFFS2_COMPR_NONE;
	if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
		/* It's an extension. Make it a hole node */
		ri->compr = JFFS2_COMPR_ZERO;
		ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
		ri->offset = cpu_to_je32(inode->i_size);
	} else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
		/* For truncate-to-zero, treat it as deletion because
                   it'll always be obsoleting all previous nodes */
		alloc_type = ALLOC_DELETION;
	}
	ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
	if (mdatalen)
		ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
	else
		ri->data_crc = cpu_to_je32(0);

	new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
	if (S_ISLNK(inode->i_mode))
		kfree(mdata);

	if (IS_ERR(new_metadata)) {
		jffs2_complete_reservation(c);
		jffs2_free_raw_inode(ri);
		mutex_unlock(&f->sem);
		return PTR_ERR(new_metadata);
	}
	/* It worked. Update the inode */
	inode->i_atime = ITIME(je32_to_cpu(ri->atime));
	inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
	inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
	inode->i_mode = jemode_to_cpu(ri->mode);
	i_uid_write(inode, je16_to_cpu(ri->uid));
	i_gid_write(inode, je16_to_cpu(ri->gid));


	old_metadata = f->metadata;

	if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
		jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);

	if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
		jffs2_add_full_dnode_to_inode(c, f, new_metadata);
		inode->i_size = iattr->ia_size;
		inode->i_blocks = (inode->i_size + 511) >> 9;
		f->metadata = NULL;
	} else {
		f->metadata = new_metadata;
	}
	if (old_metadata) {
		jffs2_mark_node_obsolete(c, old_metadata->raw);
		jffs2_free_full_dnode(old_metadata);
	}
	jffs2_free_raw_inode(ri);

	mutex_unlock(&f->sem);
	jffs2_complete_reservation(c);

	/* We have to do the truncate_setsize() without f->sem held, since
           some pages may be locked and waiting for it in readpage().
           We are protected from a simultaneous write() extending i_size
           back past iattr->ia_size, because do_truncate() holds the
           generic inode semaphore. */
	if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
		truncate_setsize(inode, iattr->ia_size);
		inode->i_blocks = (inode->i_size + 511) >> 9;
	}	

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
1004
92.71%
6
50.00%
dmitry bazhenov
dmitry bazhenov
30
2.77%
1
8.33%
eric w. biederman
eric w. biederman
26
2.40%
1
8.33%
joe perches
joe perches
18
1.66%
1
8.33%
christoph hellwig
christoph hellwig
2
0.18%
1
8.33%
ferenc havasi
ferenc havasi
2
0.18%
1
8.33%
artem bityutskiy
artem bityutskiy
1
0.09%
1
8.33%
Total
1083
100.00%
12
100.00%



int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
{
	struct inode *inode = d_inode(dentry);
	int rc;

	rc = setattr_prepare(dentry, iattr);
	if (rc)
		return rc;

	rc = jffs2_do_setattr(inode, iattr);
	if (!rc && (iattr->ia_valid & ATTR_MODE))
		rc = posix_acl_chmod(inode, inode->i_mode);

	return rc;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
35
43.75%
2
33.33%
kaigai kohei
kaigai kohei
27
33.75%
1
16.67%
christoph hellwig
christoph hellwig
13
16.25%
1
16.67%
david howells
david howells
3
3.75%
1
16.67%
jan kara
jan kara
2
2.50%
1
16.67%
Total
80
100.00%
6
100.00%



int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
	unsigned long avail;

	buf->f_type = JFFS2_SUPER_MAGIC;
	buf->f_bsize = 1 << PAGE_SHIFT;
	buf->f_blocks = c->flash_size >> PAGE_SHIFT;
	buf->f_files = 0;
	buf->f_ffree = 0;
	buf->f_namelen = JFFS2_MAX_NAME_LEN;
	buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
	buf->f_fsid.val[1] = c->mtd->index;

	spin_lock(&c->erase_completion_lock);
	avail = c->dirty_size + c->free_size;
	if (avail > c->sector_size * c->resv_blocks_write)
		avail -= c->sector_size * c->resv_blocks_write;
	else
		avail = 0;
	spin_unlock(&c->erase_completion_lock);

	buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;

	return 0;
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
154
92.22%
5
71.43%
artem bityutskiy
artem bityutskiy
8
4.79%
1
14.29%
david howells
david howells
5
2.99%
1
14.29%
Total
167
100.00%
7
100.00%



void jffs2_evict_inode (struct inode *inode)
{
	/* We can forget about this inode for now - drop all
         *  the nodelists associated with it, etc.
         */
	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);

	jffs2_dbg(1, "%s(): ino #%lu mode %o\n",
		  __func__, inode->i_ino, inode->i_mode);
	truncate_inode_pages_final(&inode->i_data);
	clear_inode(inode);
	jffs2_do_clear_inode(c, f);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
49
70.00%
1
16.67%
al viro
al viro
12
17.14%
1
16.67%
joe perches
joe perches
6
8.57%
1
16.67%
thomas gleixner
thomas gleixner
1
1.43%
1
16.67%
johannes weiner
johannes weiner
1
1.43%
1
16.67%
jan kara
jan kara
1
1.43%
1
16.67%
Total
70
100.00%
6
100.00%



struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
{
	struct jffs2_inode_info *f;
	struct jffs2_sb_info *c;
	struct jffs2_raw_inode latest_node;
	union jffs2_device_node jdev;
	struct inode *inode;
	dev_t rdev = 0;
	int ret;

	jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino);

	inode = iget_locked(sb, ino);
	if (!inode)
		return ERR_PTR(-ENOMEM);
	if (!(inode->i_state & I_NEW))
		return inode;

	f = JFFS2_INODE_INFO(inode);
	c = JFFS2_SB_INFO(inode->i_sb);

	jffs2_init_inode_info(f);
	mutex_lock(&f->sem);

	ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
	if (ret)
		goto error;

	inode->i_mode = jemode_to_cpu(latest_node.mode);
	i_uid_write(inode, je16_to_cpu(latest_node.uid));
	i_gid_write(inode, je16_to_cpu(latest_node.gid));
	inode->i_size = je32_to_cpu(latest_node.isize);
	inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
	inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
	inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));

	set_nlink(inode, f->inocache->pino_nlink);

	inode->i_blocks = (inode->i_size + 511) >> 9;

	switch (inode->i_mode & S_IFMT) {

	case S_IFLNK:
		inode->i_op = &jffs2_symlink_inode_operations;
		inode->i_link = f->target;
		break;

	case S_IFDIR:
	{
		struct jffs2_full_dirent *fd;
		set_nlink(inode, 2); /* parent and '.' */

		for (fd=f->dents; fd; fd = fd->next) {
			if (fd->type == DT_DIR && fd->ino)
				inc_nlink(inode);
		}
		/* Root dir gets i_nlink 3 for some reason */
		if (inode->i_ino == 1)
			inc_nlink(inode);

		inode->i_op = &jffs2_dir_inode_operations;
		inode->i_fop = &jffs2_dir_operations;
		break;
	}
	case S_IFREG:
		inode->i_op = &jffs2_file_inode_operations;
		inode->i_fop = &jffs2_file_operations;
		inode->i_mapping->a_ops = &jffs2_file_address_operations;
		inode->i_mapping->nrpages = 0;
		break;

	case S_IFBLK:
	case S_IFCHR:
		/* Read the device numbers from the media */
		if (f->metadata->size != sizeof(jdev.old_id) &&
		    f->metadata->size != sizeof(jdev.new_id)) {
			pr_notice("Device node has strange size %d\n",
				  f->metadata->size);
			goto error_io;
		}
		jffs2_dbg(1, "Reading device numbers from flash\n");
		ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
		if (ret < 0) {
			/* Eep */
			pr_notice("Read device numbers for inode %lu failed\n",
				  (unsigned long)inode->i_ino);
			goto error;
		}
		if (f->metadata->size == sizeof(jdev.old_id))
			rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
		else
			rdev = new_decode_dev(je32_to_cpu(jdev.new_id));

	case S_IFSOCK:
	case S_IFIFO:
		inode->i_op = &jffs2_file_inode_operations;
		init_special_inode(inode, inode->i_mode, rdev);
		break;

	default:
		pr_warn("%s(): Bogus i_mode %o for ino %lu\n",
			__func__, inode->i_mode, (unsigned long)inode->i_ino);
	}

	mutex_unlock(&f->sem);

	jffs2_dbg(1, "jffs2_read_inode() returning\n");
	unlock_new_inode(inode);
	return inode;

error_io:
	ret = -EIO;
error:
	mutex_unlock(&f->sem);
	jffs2_do_clear_inode(c, f);
	iget_failed(inode);
	return ERR_PTR(ret);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
488
74.16%
7
38.89%
david howells
david howells
105
15.96%
1
5.56%
joe perches
joe perches
18
2.74%
2
11.11%
al viro
al viro
8
1.22%
1
5.56%
eric w. biederman
eric w. biederman
8
1.22%
1
5.56%
miklos szeredi
miklos szeredi
8
1.22%
1
5.56%
thomas gleixner
thomas gleixner
7
1.06%
1
5.56%
dave hansen
dave hansen
6
0.91%
1
5.56%
andrew morton
andrew morton
5
0.76%
1
5.56%
brian norris
brian norris
3
0.46%
1
5.56%
andi kleen
andi kleen
2
0.30%
1
5.56%
Total
658
100.00%
18
100.00%



void jffs2_dirty_inode(struct inode *inode, int flags)
{
	struct iattr iattr;

	if (!(inode->i_state & I_DIRTY_DATASYNC)) {
		jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n",
			  __func__, inode->i_ino);
		return;
	}

	jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n",
		  __func__, inode->i_ino);

	iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
	iattr.ia_mode = inode->i_mode;
	iattr.ia_uid = inode->i_uid;
	iattr.ia_gid = inode->i_gid;
	iattr.ia_atime = inode->i_atime;
	iattr.ia_mtime = inode->i_mtime;
	iattr.ia_ctime = inode->i_ctime;

	jffs2_do_setattr(inode, &iattr);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
114
88.37%
1
33.33%
joe perches
joe perches
12
9.30%
1
33.33%
christoph hellwig
christoph hellwig
3
2.33%
1
33.33%
Total
129
100.00%
3
100.00%



int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data)
{
	struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);

	if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY))
		return -EROFS;

	/* We stop if it was running, then restart if it needs to.
           This also catches the case where it was stopped and this
           is just a remount to restart it.
           Flush the writebuffer, if neccecary, else we loose it */
	if (!(sb->s_flags & MS_RDONLY)) {
		jffs2_stop_garbage_collect_thread(c);
		mutex_lock(&c->alloc_sem);
		jffs2_flush_wbuf_pad(c);
		mutex_unlock(&c->alloc_sem);
	}

	if (!(*flags & MS_RDONLY))
		jffs2_start_garbage_collect_thread(c);

	*flags |= MS_NOATIME;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
109
97.32%
3
60.00%
al viro
al viro
2
1.79%
1
20.00%
andres salomon
andres salomon
1
0.89%
1
20.00%
Total
112
100.00%
5
100.00%

/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
   fill in the raw_inode while you're at it. */


struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri)
{
	struct inode *inode;
	struct super_block *sb = dir_i->i_sb;
	struct jffs2_sb_info *c;
	struct jffs2_inode_info *f;
	int ret;

	jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n",
		  __func__, dir_i->i_ino, mode);

	c = JFFS2_SB_INFO(sb);

	inode = new_inode(sb);

	if (!inode)
		return ERR_PTR(-ENOMEM);

	f = JFFS2_INODE_INFO(inode);
	jffs2_init_inode_info(f);
	mutex_lock(&f->sem);

	memset(ri, 0, sizeof(*ri));
	/* Set OS-specific defaults for new inodes */
	ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid()));

	if (dir_i->i_mode & S_ISGID) {
		ri->gid = cpu_to_je16(i_gid_read(dir_i));
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else {
		ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid()));
	}

	/* POSIX ACLs have to be processed now, at least partly.
           The umask is only applied if there's no default ACL */
	ret = jffs2_init_acl_pre(dir_i, inode, &mode);
	if (ret) {
		mutex_unlock(&f->sem);
		make_bad_inode(inode);
		iput(inode);
		return ERR_PTR(ret);
	}
	ret = jffs2_do_new_inode (c, f, mode, ri);
	if (ret) {
		mutex_unlock(&f->sem);
		make_bad_inode(inode);
		iput(inode);
		return ERR_PTR(ret);
	}
	set_nlink(inode, 1);
	inode->i_ino = je32_to_cpu(ri->ino);
	inode->i_mode = jemode_to_cpu(ri->mode);
	i_gid_write(inode, je16_to_cpu(ri->gid));
	i_uid_write(inode, je16_to_cpu(ri->uid));
	inode->i_atime = inode->i_ctime = inode->i_mtime = current_time(inode);
	ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));

	inode->i_blocks = 0;
	inode->i_size = 0;

	if (insert_inode_locked(inode) < 0) {
		mutex_unlock(&f->sem);
		make_bad_inode(inode);
		iput(inode);
		return ERR_PTR(-EINVAL);
	}

	return inode;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
david woodhouse
david woodhouse
335
79.95%
6
40.00%
wang guoli
wang guoli
24
5.73%
1
6.67%
eric w. biederman
eric w. biederman
23
5.49%
1
6.67%
kaigai kohei
kaigai kohei
11
2.63%
1
6.67%
thomas gleixner
thomas gleixner
7
1.67%
1
6.67%
joe perches
joe perches
6
1.43%
1
6.67%
deepa dinamani
deepa dinamani
4
0.95%
1
6.67%
david howells
david howells
4
0.95%
1
6.67%
miklos szeredi
miklos szeredi
4
0.95%
1
6.67%
al viro
al viro
1
0.24%
1
6.67%
Total
419
100.00%
15
100.00%



static int calculate_inocache_hashsize(uint32_t flash_size)
{
	/*
         * Pick a inocache hash size based on the size of the medium.
         * Count how many megabytes we're dealing with, apply a hashsize twice
         * that size, but rounding down to the usual big powers of 2. And keep
         * to sensible bounds.
         */

	int size_mb = flash_size / 1024 / 1024;
	int hashsize = (size_mb * 2) & ~0x3f;

	if (hashsize < INOCACHE_HASHSIZE_MIN)
		return INOCACHE_HASHSIZE_MIN;
	if (hashsize > INOCACHE_HASHSIZE_MAX)
		return INOCACHE_HASHSIZE_MAX;

	return hashsize;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
daniel drake
daniel drake
52
100.00%
1
100.00%
Total
52
100.00%
1
100.00%



int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
{
	struct jffs2_sb_info *c;
	struct inode *root_i;
	int ret;
	size_t blocks;

	c = JFFS2_SB_INFO(sb);

	/* Do not support the MLC nand */
	if (c->mtd->type == MTD_MLCNANDFLASH)
		return -EINVAL;

#ifndef