Release 4.10 fs/bfs/dir.c

Directory: fs/bfs
/*
 *      fs/bfs/dir.c
 *      BFS directory operations.
 *      Copyright (C) 1999,2000  Tigran Aivazian <tigran@veritas.com>
 *      Made endianness-clean by Andrew Stribblehill <ads@wompom.org> 2005
 */

#include <linux/time.h>
#include <linux/string.h>
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/sched.h>
#include "bfs.h"


#undef DEBUG

#ifdef DEBUG

#define dprintf(x...)	printf(x)
#else

#define dprintf(x...)
#endif

static int bfs_add_entry(struct inode *dir, const unsigned char *name,
						int namelen, int ino);
static struct buffer_head *bfs_find_entry(struct inode *dir,
				const unsigned char *name, int namelen,
				struct bfs_dirent **res_dir);



static int bfs_readdir(struct file *f, struct dir_context *ctx)
{
	struct inode *dir = file_inode(f);
	struct buffer_head *bh;
	struct bfs_dirent *de;
	unsigned int offset;
	int block;

	if (ctx->pos & (BFS_DIRENT_SIZE - 1)) {
		printf("Bad f_pos=%08lx for %s:%08lx\n",
					(unsigned long)ctx->pos,
					dir->i_sb->s_id, dir->i_ino);
		return -EINVAL;
	}

	while (ctx->pos < dir->i_size) {
		offset = ctx->pos & (BFS_BSIZE - 1);
		block = BFS_I(dir)->i_sblock + (ctx->pos >> BFS_BSIZE_BITS);
		bh = sb_bread(dir->i_sb, block);
		if (!bh) {
			ctx->pos += BFS_BSIZE - offset;
			continue;
		}
		do {
			de = (struct bfs_dirent *)(bh->b_data + offset);
			if (de->ino) {
				int size = strnlen(de->name, BFS_NAMELEN);
				if (!dir_emit(ctx, de->name, size,
						le16_to_cpu(de->ino),
						DT_UNKNOWN)) {
					brelse(bh);
					return 0;
				}
			}
			offset += BFS_DIRENT_SIZE;
			ctx->pos += BFS_DIRENT_SIZE;
		} while ((offset < BFS_BSIZE) && (ctx->pos < dir->i_size));
		brelse(bh);
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 214 82.31% 4 33.33%
al viro al viro 26 10.00% 2 16.67%
linus torvalds linus torvalds 13 5.00% 4 33.33%
dmitri vorobiev dmitri vorobiev 4 1.54% 1 8.33%
andrew stribblehill andrew stribblehill 3 1.15% 1 8.33%
Total 260 100.00% 12 100.00%


const struct file_operations bfs_dir_operations = {
	.read		= generic_read_dir,
	.iterate_shared	= bfs_readdir,
	.fsync		= generic_file_fsync,
	.llseek		= generic_file_llseek,
};



static int bfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
						bool excl)
{
	int err;
	struct inode *inode;
	struct super_block *s = dir->i_sb;
	struct bfs_sb_info *info = BFS_SB(s);
	unsigned long ino;

	inode = new_inode(s);
	if (!inode)
		return -ENOMEM;
	mutex_lock(&info->bfs_lock);
	ino = find_first_zero_bit(info->si_imap, info->si_lasti + 1);
	if (ino > info->si_lasti) {
		mutex_unlock(&info->bfs_lock);
		iput(inode);
		return -ENOSPC;
	}
	set_bit(ino, info->si_imap);
	info->si_freei--;
	inode_init_owner(inode, dir, mode);
	inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
	inode->i_blocks = 0;
	inode->i_op = &bfs_file_inops;
	inode->i_fop = &bfs_file_operations;
	inode->i_mapping->a_ops = &bfs_aops;
	inode->i_ino = ino;
	BFS_I(inode)->i_dsk_ino = ino;
	BFS_I(inode)->i_sblock = 0;
	BFS_I(inode)->i_eblock = 0;
	insert_inode_hash(inode);
        mark_inode_dirty(inode);
	bfs_dump_imap("create", s);

	err = bfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len,
							inode->i_ino);
	if (err) {
		inode_dec_link_count(inode);
		mutex_unlock(&info->bfs_lock);
		iput(inode);
		return err;
	}
	mutex_unlock(&info->bfs_lock);
	d_instantiate(dentry, inode);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 214 69.93% 5 26.32%
dmitri vorobiev dmitri vorobiev 28 9.15% 1 5.26%
dave jones dave jones 20 6.54% 1 5.26%
linus torvalds linus torvalds 16 5.23% 1 5.26%
al viro al viro 7 2.29% 3 15.79%
dmitriy monakhov dmitriy monakhov 6 1.96% 1 5.26%
eric sesterhenn eric sesterhenn 5 1.63% 1 5.26%
deepa dinamani deepa dinamani 4 1.31% 1 5.26%
akinobu mita akinobu mita 2 0.65% 1 5.26%
trond myklebust trond myklebust 1 0.33% 1 5.26%
sanidhya kashyap sanidhya kashyap 1 0.33% 1 5.26%
fabian frederick fabian frederick 1 0.33% 1 5.26%
dave hansen dave hansen 1 0.33% 1 5.26%
Total 306 100.00% 19 100.00%



static struct dentry *bfs_lookup(struct inode *dir, struct dentry *dentry,
						unsigned int flags)
{
	struct inode *inode = NULL;
	struct buffer_head *bh;
	struct bfs_dirent *de;
	struct bfs_sb_info *info = BFS_SB(dir->i_sb);

	if (dentry->d_name.len > BFS_NAMELEN)
		return ERR_PTR(-ENAMETOOLONG);

	mutex_lock(&info->bfs_lock);
	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
	if (bh) {
		unsigned long ino = (unsigned long)le16_to_cpu(de->ino);
		brelse(bh);
		inode = bfs_iget(dir->i_sb, ino);
		if (IS_ERR(inode)) {
			mutex_unlock(&info->bfs_lock);
			return ERR_CAST(inode);
		}
	}
	mutex_unlock(&info->bfs_lock);
	d_add(dentry, inode);
	return NULL;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 123 69.89% 1 14.29%
dmitri vorobiev dmitri vorobiev 33 18.75% 1 14.29%
al viro al viro 8 4.55% 2 28.57%
david howells david howells 6 3.41% 1 14.29%
andrew stribblehill andrew stribblehill 5 2.84% 1 14.29%
trond myklebust trond myklebust 1 0.57% 1 14.29%
Total 176 100.00% 7 100.00%



static int bfs_link(struct dentry *old, struct inode *dir,
						struct dentry *new)
{
	struct inode *inode = d_inode(old);
	struct bfs_sb_info *info = BFS_SB(inode->i_sb);
	int err;

	mutex_lock(&info->bfs_lock);
	err = bfs_add_entry(dir, new->d_name.name, new->d_name.len,
							inode->i_ino);
	if (err) {
		mutex_unlock(&info->bfs_lock);
		return err;
	}
	inc_nlink(inode);
	inode->i_ctime = current_time(inode);
	mark_inode_dirty(inode);
	ihold(inode);
	d_instantiate(new, inode);
	mutex_unlock(&info->bfs_lock);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 87 63.97% 2 25.00%
dmitri vorobiev dmitri vorobiev 33 24.26% 1 12.50%
al viro al viro 6 4.41% 2 25.00%
deepa dinamani deepa dinamani 4 2.94% 1 12.50%
dave hansen dave hansen 3 2.21% 1 12.50%
david howells david howells 3 2.21% 1 12.50%
Total 136 100.00% 8 100.00%



static int bfs_unlink(struct inode *dir, struct dentry *dentry)
{
	int error = -ENOENT;
	struct inode *inode = d_inode(dentry);
	struct buffer_head *bh;
	struct bfs_dirent *de;
	struct bfs_sb_info *info = BFS_SB(inode->i_sb);

	mutex_lock(&info->bfs_lock);
	bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
	if (!bh || (le16_to_cpu(de->ino) != inode->i_ino))
		goto out_brelse;

	if (!inode->i_nlink) {
		printf("unlinking non-existent file %s:%lu (nlink=%d)\n",
					inode->i_sb->s_id, inode->i_ino,
					inode->i_nlink);
		set_nlink(inode, 1);
	}
	de->ino = 0;
	mark_buffer_dirty_inode(bh, dir);
	dir->i_ctime = dir->i_mtime = current_time(dir);
	mark_inode_dirty(dir);
	inode->i_ctime = dir->i_ctime;
	inode_dec_link_count(inode);
	error = 0;

out_brelse:
	brelse(bh);
	mutex_unlock(&info->bfs_lock);
	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 155 75.24% 2 16.67%
dmitri vorobiev dmitri vorobiev 28 13.59% 2 16.67%
al viro al viro 5 2.43% 2 16.67%
deepa dinamani deepa dinamani 4 1.94% 1 8.33%
miklos szeredi miklos szeredi 4 1.94% 1 8.33%
david howells david howells 3 1.46% 1 8.33%
andrew stribblehill andrew stribblehill 3 1.46% 1 8.33%
linus torvalds linus torvalds 3 1.46% 1 8.33%
dave hansen dave hansen 1 0.49% 1 8.33%
Total 206 100.00% 12 100.00%



static int bfs_rename(struct inode *old_dir, struct dentry *old_dentry,
		      struct inode *new_dir, struct dentry *new_dentry,
		      unsigned int flags)
{
	struct inode *old_inode, *new_inode;
	struct buffer_head *old_bh, *new_bh;
	struct bfs_dirent *old_de, *new_de;
	struct bfs_sb_info *info;
	int error = -ENOENT;

	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

	old_bh = new_bh = NULL;
	old_inode = d_inode(old_dentry);
	if (S_ISDIR(old_inode->i_mode))
		return -EINVAL;

	info = BFS_SB(old_inode->i_sb);

	mutex_lock(&info->bfs_lock);
	old_bh = bfs_find_entry(old_dir, 
				old_dentry->d_name.name, 
				old_dentry->d_name.len, &old_de);

	if (!old_bh || (le16_to_cpu(old_de->ino) != old_inode->i_ino))
		goto end_rename;

	error = -EPERM;
	new_inode = d_inode(new_dentry);
	new_bh = bfs_find_entry(new_dir, 
				new_dentry->d_name.name, 
				new_dentry->d_name.len, &new_de);

	if (new_bh && !new_inode) {
		brelse(new_bh);
		new_bh = NULL;
	}
	if (!new_bh) {
		error = bfs_add_entry(new_dir, 
					new_dentry->d_name.name,
					new_dentry->d_name.len,
					old_inode->i_ino);
		if (error)
			goto end_rename;
	}
	old_de->ino = 0;
	old_dir->i_ctime = old_dir->i_mtime = current_time(old_dir);
	mark_inode_dirty(old_dir);
	if (new_inode) {
		new_inode->i_ctime = current_time(new_inode);
		inode_dec_link_count(new_inode);
	}
	mark_buffer_dirty_inode(old_bh, old_dir);
	error = 0;

end_rename:
	mutex_unlock(&info->bfs_lock);
	brelse(old_bh);
	brelse(new_bh);
	return error;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 261 79.33% 1 10.00%
dmitri vorobiev dmitri vorobiev 30 9.12% 2 20.00%
miklos szeredi miklos szeredi 15 4.56% 1 10.00%
deepa dinamani deepa dinamani 8 2.43% 1 10.00%
david howells david howells 6 1.82% 1 10.00%
al viro al viro 5 1.52% 2 20.00%
andrew stribblehill andrew stribblehill 3 0.91% 1 10.00%
dave hansen dave hansen 1 0.30% 1 10.00%
Total 329 100.00% 10 100.00%


const struct inode_operations bfs_dir_inops = {
	.create			= bfs_create,
	.lookup			= bfs_lookup,
	.link			= bfs_link,
	.unlink			= bfs_unlink,
	.rename			= bfs_rename,
};



static int bfs_add_entry(struct inode *dir, const unsigned char *name,
							int namelen, int ino)
{
	struct buffer_head *bh;
	struct bfs_dirent *de;
	int block, sblock, eblock, off, pos;
	int i;

	dprintf("name=%s, namelen=%d\n", name, namelen);

	if (!namelen)
		return -ENOENT;
	if (namelen > BFS_NAMELEN)
		return -ENAMETOOLONG;

	sblock = BFS_I(dir)->i_sblock;
	eblock = BFS_I(dir)->i_eblock;
	for (block = sblock; block <= eblock; block++) {
		bh = sb_bread(dir->i_sb, block);
		if (!bh)
			return -EIO;
		for (off = 0; off < BFS_BSIZE; off += BFS_DIRENT_SIZE) {
			de = (struct bfs_dirent *)(bh->b_data + off);
			if (!de->ino) {
				pos = (block - sblock) * BFS_BSIZE + off;
				if (pos >= dir->i_size) {
					dir->i_size += BFS_DIRENT_SIZE;
					dir->i_ctime = current_time(dir);
				}
				dir->i_mtime = current_time(dir);
				mark_inode_dirty(dir);
				de->ino = cpu_to_le16((u16)ino);
				for (i = 0; i < BFS_NAMELEN; i++)
					de->name[i] =
						(i < namelen) ? name[i] : 0;
				mark_buffer_dirty_inode(bh, dir);
				brelse(bh);
				return 0;
			}
		}
		brelse(bh);
	}
	return -ENOSPC;
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 249 86.46% 2 20.00%
linus torvalds linus torvalds 12 4.17% 2 20.00%
deepa dinamani deepa dinamani 8 2.78% 1 10.00%
andrew stribblehill andrew stribblehill 7 2.43% 1 10.00%
dmitri vorobiev dmitri vorobiev 7 2.43% 1 10.00%
al viro al viro 3 1.04% 1 10.00%
sanidhya kashyap sanidhya kashyap 1 0.35% 1 10.00%
andrew morton andrew morton 1 0.35% 1 10.00%
Total 288 100.00% 10 100.00%



static inline int bfs_namecmp(int len, const unsigned char *name,
							const char *buffer)
{
	if ((len < BFS_NAMELEN) && buffer[len])
		return 0;
	return !memcmp(name, buffer, len);
}

Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 45 93.75% 1 33.33%
dmitri vorobiev dmitri vorobiev 2 4.17% 1 33.33%
andrew stribblehill andrew stribblehill 1 2.08% 1 33.33%
Total 48 100.00% 3 100.00%



static struct buffer_head *bfs_find_entry(struct inode *dir,
			const unsigned char *name, int namelen,
			struct bfs_dirent **res_dir)
{
	unsigned long block = 0, offset = 0;
	struct buffer_head *bh = NULL;
	struct bfs_dirent *de;

	*res_dir = NULL;
	if (namelen > BFS_NAMELEN)
		return NULL;

	while (block * BFS_BSIZE + offset < dir->i_size) {
		if (!bh) {
			bh = sb_bread(dir->i_sb, BFS_I(dir)->i_sblock + block);
			if (!bh) {
				block++;
				continue;
			}
		}
		de = (struct bfs_dirent *)(bh->b_data + offset);
		offset += BFS_DIRENT_SIZE;
		if (le16_to_cpu(de->ino) &&
				bfs_namecmp(namelen, name, de->name)) {
			*res_dir = de;
			return bh;
		}
		if (offset < bh->b_size)
			continue;
		brelse(bh);
		bh = NULL;
		offset = 0;
		block++;
	}
	brelse(bh);
	return NULL;
}
Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 180 91.84% 1 20.00%
linus torvalds linus torvalds 6 3.06% 2 40.00%
dmitri vorobiev dmitri vorobiev 6 3.06% 1 20.00%
andrew stribblehill andrew stribblehill 4 2.04% 1 20.00%
Total 196 100.00% 5 100.00%

Overall Contributors
Person Tokens Prop Commits CommitProp
pre-git pre-git 1643 78.35% 9 16.98%
dmitri vorobiev dmitri vorobiev 171 8.15% 2 3.77%
al viro al viro 63 3.00% 13 24.53%
linus torvalds linus torvalds 50 2.38% 4 7.55%
andrew stribblehill andrew stribblehill 29 1.38% 1 1.89%
deepa dinamani deepa dinamani 28 1.34% 1 1.89%
dave jones dave jones 21 1.00% 2 3.77%
miklos szeredi miklos szeredi 19 0.91% 2 3.77%
david howells david howells 18 0.86% 2 3.77%
art haas art haas 16 0.76% 1 1.89%
christoph hellwig christoph hellwig 12 0.57% 4 7.55%
dave hansen dave hansen 6 0.29% 2 3.77%
dmitriy monakhov dmitriy monakhov 6 0.29% 1 1.89%
eric sesterhenn eric sesterhenn 5 0.24% 1 1.89%
trond myklebust trond myklebust 2 0.10% 2 3.77%
arjan van de ven arjan van de ven 2 0.10% 2 3.77%
akinobu mita akinobu mita 2 0.10% 1 1.89%
sanidhya kashyap sanidhya kashyap 2 0.10% 1 1.89%
andrew morton andrew morton 1 0.05% 1 1.89%
fabian frederick fabian frederick 1 0.05% 1 1.89%
Total 2097 100.00% 53 100.00%
Directory: fs/bfs

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
pre-git	pre-git	214	82.31%	4	33.33%
al viro	al viro	26	10.00%	2	16.67%
linus torvalds	linus torvalds	13	5.00%	4	33.33%
dmitri vorobiev	dmitri vorobiev	4	1.54%	1	8.33%
andrew stribblehill	andrew stribblehill	3	1.15%	1	8.33%
	Total	260	100.00%	12	100.00%
cregit-Linux how code gets into the kernel

Release 4.10 fs/bfs/dir.c

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