Release 4.11 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/cred.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
1004
92.71%
6
50.00%
Dmitry Bazhenov
30
2.77%
1
8.33%
Eric W. Biedermann
26
2.40%
1
8.33%
Joe Perches
18
1.66%
1
8.33%
Christoph Hellwig
2
0.18%
1
8.33%
Ferenc Havasi
2
0.18%
1
8.33%
Artem B. 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
35
43.75%
2
33.33%
KaiGai Kohei
27
33.75%
1
16.67%
Christoph Hellwig
13
16.25%
1
16.67%
David Howells
3
3.75%
1
16.67%
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
154
92.22%
5
71.43%
Artem B. Bityutskiy
8
4.79%
1
14.29%
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
49
70.00%
1
16.67%
Al Viro
12
17.14%
1
16.67%
Joe Perches
6
8.57%
1
16.67%
Johannes Weiner
1
1.43%
1
16.67%
Thomas Gleixner
1
1.43%
1
16.67%
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
488
74.16%
7
38.89%
David Howells
105
15.96%
1
5.56%
Joe Perches
18
2.74%
2
11.11%
Al Viro
8
1.22%
1
5.56%
Miklos Szeredi
8
1.22%
1
5.56%
Eric W. Biedermann
8
1.22%
1
5.56%
Thomas Gleixner
7
1.06%
1
5.56%
Dave Hansen
6
0.91%
1
5.56%
Andrew Morton
5
0.76%
1
5.56%
Brian Norris
3
0.46%
1
5.56%
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
114
88.37%
1
33.33%
Joe Perches
12
9.30%
1
33.33%
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
109
97.32%
3
60.00%
Al Viro
2
1.79%
1
20.00%
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
335
79.95%
6
40.00%
Wang Guoli
24
5.73%
1
6.67%
Eric W. Biedermann
23
5.49%
1
6.67%
KaiGai Kohei
11
2.63%
1
6.67%
Thomas Gleixner
7
1.67%
1
6.67%
Joe Perches
6
1.43%
1
6.67%
David Howells
4
0.95%
1
6.67%
Miklos Szeredi
4
0.95%
1
6.67%
Deepa Dinamani
4
0.95%
1
6.67%
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
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 CONFIG_JFFS2_FS_WRITEBUFFER
	if (c->mtd->type == MTD_NANDFLASH) {
		pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n");
		return -EINVAL;
	}
	if (c->mtd->type == MTD_DATAFLASH) {
		pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n");
		return -EINVAL;
	}
#endif

	c->flash_size = c->mtd->size;
	c->sector_size = c->mtd->erasesize;
	blocks = c->flash_size / c->sector_size;

	/*
         * Size alignment check
         */
	if ((c->sector_size * blocks) != c->flash_size) {
		c->flash_size = c->sector_size * blocks;
		pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n",
			c->flash_size / 1024);
	}

	if (c->flash_size < 5*c->sector_size) {
		pr_err("Too few erase blocks (%d)\n",
		       c->flash_size / c->sector_size);
		return -EINVAL;
	}

	c->cleanmarker_size = sizeof(struct jffs2_unknown_node);

	/* NAND (or other bizarre) flash... do setup accordingly */
	ret = jffs2_flash_setup(c);
	if (ret)
		return ret;

	c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
	c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
	if (!c->inocache_list) {
		ret = -ENOMEM;
		goto out_wbuf;
	}

	jffs2_init_xattr_subsystem(c);

	if ((ret = jffs2_do_mount_fs(c)))
		goto out_inohash;

	jffs2_dbg(1, "%s(): Getting root inode\n", __func__);
	root_i = jffs2_iget(sb, 1);
	if (IS_ERR(root_i)) {
		jffs2_dbg(1, "get root inode failed\n");
		ret = PTR_ERR(root_i);
		goto out_root;
	}

	ret = -ENOMEM;

	jffs2_dbg(1, "%s(): d_make_root()\n", __func__);
	sb->s_root = d_make_root(root_i);
	if (!sb->s_root)
		goto out_root;

	sb->s_maxbytes = 0xFFFFFFFF;
	sb->s_blocksize = PAGE_SIZE;
	sb->s_blocksize_bits = PAGE_SHIFT;
	sb->s_magic = JFFS2_SUPER_MAGIC;
	if (!(sb->s_flags & MS_RDONLY))
		jffs2_start_garbage_collect_thread(c);
	return 0;

out_root:
	jffs2_free_ino_caches(c);
	jffs2_free_raw_node_refs(c);
	kvfree(c->blocks);
 out_inohash:
	jffs2_clear_xattr_subsystem(c);
	kfree(c->inocache_list);
 out_wbuf:
	jffs2_flash_cleanup(c);

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
348
76.32%
5
26.32%
Andrew Victor
22
4.82%
2
10.53%
Joe Perches
22
4.82%
3
15.79%
David Howells
17
3.73%
1
5.26%
Huang Shijie
15
3.29%
1
5.26%
Daniel Drake
14
3.07%
1
5.26%
KaiGai Kohei
10
2.19%
1
5.26%
Kirill A. Shutemov
2
0.44%
1
5.26%
Yan Burman
2
0.44%
1
5.26%
Al Viro
2
0.44%
1
5.26%
Linus Torvalds
1
0.22%
1
5.26%
Tetsuo Handa
1
0.22%
1
5.26%
Total
456
100.00%
19
100.00%



void jffs2_gc_release_inode(struct jffs2_sb_info *c,
				   struct jffs2_inode_info *f)
{
	iput(OFNI_EDONI_2SFFJ(f));
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
23
100.00%
1
100.00%
Total
23
100.00%
1
100.00%



struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
					      int inum, int unlinked)
{
	struct inode *inode;
	struct jffs2_inode_cache *ic;

	if (unlinked) {
		/* The inode has zero nlink but its nodes weren't yet marked
                   obsolete. This has to be because we're still waiting for
                   the final (close() and) iput() to happen.

                   There's a possibility that the final iput() could have
                   happened while we were contemplating. In order to ensure
                   that we don't cause a new read_inode() (which would fail)
                   for the inode in question, we use ilookup() in this case
                   instead of iget().

                   The nlink can't _become_ zero at this point because we're
                   holding the alloc_sem, and jffs2_do_unlink() would also
                   need that while decrementing nlink on any inode.
                */
		inode = ilookup(OFNI_BS_2SFFJ(c), inum);
		if (!inode) {
			jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n",
				  inum);

			spin_lock(&c->inocache_lock);
			ic = jffs2_get_ino_cache(c, inum);
			if (!ic) {
				jffs2_dbg(1, "Inode cache for ino #%u is gone\n",
					  inum);
				spin_unlock(&c->inocache_lock);
				return NULL;
			}
			if (ic->state != INO_STATE_CHECKEDABSENT) {
				/* Wait for progress. Don't just loop */
				jffs2_dbg(1, "Waiting for ino #%u in state %d\n",
					  ic->ino, ic->state);
				sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
			} else {
				spin_unlock(&c->inocache_lock);
			}

			return NULL;
		}
	} else {
		/* Inode has links to it still; they're not going away because
                   jffs2_do_unlink() would need the alloc_sem and we have it.
                   Just iget() it, and if read_inode() is necessary that's OK.
                */
		inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}
	if (is_bad_inode(inode)) {
		pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n",
			  inum, unlinked);
		/* NB. This will happen again. We need to do something appropriate here. */
		iput(inode);
		return ERR_PTR(-EIO);
	}

	return JFFS2_INODE_INFO(inode);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
208
92.04%
2
33.33%
Joe Perches
11
4.87%
2
33.33%
David Howells
6
2.65%
1
16.67%
Thomas Gleixner
1
0.44%
1
16.67%
Total
226
100.00%
6
100.00%



unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
				   struct jffs2_inode_info *f,
				   unsigned long offset,
				   unsigned long *priv)
{
	struct inode *inode = OFNI_EDONI_2SFFJ(f);
	struct page *pg;

	pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT,
			     (void *)jffs2_do_readpage_unlock, inode);
	if (IS_ERR(pg))
		return (void *)pg;

	*priv = (unsigned long)pg;
	return kmap(pg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
89
97.80%
1
33.33%
Kirill A. Shutemov
1
1.10%
1
33.33%
Sasha Levin
1
1.10%
1
33.33%
Total
91
100.00%
3
100.00%



void jffs2_gc_release_page(struct jffs2_sb_info *c,
			   unsigned char *ptr,
			   unsigned long *priv)
{
	struct page *pg = (void *)*priv;

	kunmap(pg);
	put_page(pg);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
41
97.62%
1
50.00%
Kirill A. Shutemov
1
2.38%
1
50.00%
Total
42
100.00%
2
100.00%



static int jffs2_flash_setup(struct jffs2_sb_info *c) {
	int ret = 0;

	if (jffs2_cleanmarker_oob(c)) {
		/* NAND flash... do setup accordingly */
		ret = jffs2_nand_flash_setup(c);
		if (ret)
			return ret;
	}

	/* and Dataflash */
	if (jffs2_dataflash(c)) {
		ret = jffs2_dataflash_setup(c);
		if (ret)
			return ret;
	}

	/* and Intel "Sibley" flash */
	if (jffs2_nor_wbuf_flash(c)) {
		ret = jffs2_nor_wbuf_flash_setup(c);
		if (ret)
			return ret;
	}

	/* and an UBI volume */
	if (jffs2_ubivol(c)) {
		ret = jffs2_ubivol_setup(c);
		if (ret)
			return ret;
	}

	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
42
36.52%
1
20.00%
Artem B. Bityutskiy
24
20.87%
1
20.00%
Andrew Victor
24
20.87%
1
20.00%
Nico Pitre
24
20.87%
1
20.00%
Adrian Bunk
1
0.87%
1
20.00%
Total
115
100.00%
5
100.00%



void jffs2_flash_cleanup(struct jffs2_sb_info *c) {

	if (jffs2_cleanmarker_oob(c)) {
		jffs2_nand_flash_cleanup(c);
	}

	/* and DataFlash */
	if (jffs2_dataflash(c)) {
		jffs2_dataflash_cleanup(c);
	}

	/* and Intel "Sibley" flash */
	if (jffs2_nor_wbuf_flash(c)) {
		jffs2_nor_wbuf_flash_cleanup(c);
	}

	/* and an UBI volume */
	if (jffs2_ubivol(c)) {
		jffs2_ubivol_cleanup(c);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
24
34.78%
1
25.00%
Artem B. Bityutskiy
15
21.74%
1
25.00%
Andrew Victor
15
21.74%
1
25.00%
Nico Pitre
15
21.74%
1
25.00%
Total
69
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
David Woodhouse
3092
80.31%
17
25.00%
David Howells
140
3.64%
4
5.88%
Joe Perches
100
2.60%
3
4.41%
Daniel Drake
66
1.71%
1
1.47%
Andrew Victor
61
1.58%
2
2.94%
Eric W. Biedermann
57
1.48%
1
1.47%
Artem B. Bityutskiy
51
1.32%
4
5.88%
KaiGai Kohei
48
1.25%
2
2.94%
Nico Pitre
39
1.01%
1
1.47%
Dmitry Bazhenov
30
0.78%
1
1.47%
Al Viro
25
0.65%
5
7.35%
Wang Guoli
24
0.62%
1
1.47%
Christoph Hellwig
21
0.55%
4
5.88%
Thomas Gleixner
16
0.42%
2
2.94%
Huang Shijie
15
0.39%
1
1.47%
Miklos Szeredi
12
0.31%
1
1.47%
Adrian Bunk
11
0.29%
1
1.47%
Dave Hansen
6
0.16%
1
1.47%
Andrew Morton
5
0.13%
1
1.47%
Deepa Dinamani
4
0.10%
1
1.47%
Kirill A. Shutemov
4
0.10%
1
1.47%
Jan Kara
3
0.08%
2
2.94%
Brian Norris
3
0.08%
1
1.47%
Randy Dunlap
3
0.08%
1
1.47%
Ingo Molnar
3
0.08%
1
1.47%
Yan Burman
2
0.05%
1
1.47%
Ferenc Havasi
2
0.05%
1
1.47%
Andi Kleen
2
0.05%
1
1.47%
Sasha Levin
1
0.03%
1
1.47%
Tetsuo Handa
1
0.03%
1
1.47%
Johannes Weiner
1
0.03%
1
1.47%
Linus Torvalds
1
0.03%
1
1.47%
Andres Salomon
1
0.03%
1
1.47%
Total
3850
100.00%
68
100.00%
Directory: fs/jffs2

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