Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 362 insertions, 0 deletions

diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
new file mode 100644
index 000000000000..5a1e5ce057ff
--- /dev/null
+++ b/fs/bfs/dir.c
@@ -0,0 +1,362 @@
+/*
+ *      fs/bfs/dir.c
+ *      BFS directory operations.
+ *      Copyright (C) 1999,2000  Tigran Aivazian <tigran@veritas.com>
+ */
+
+#include <linux/time.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.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 char * name, int namelen, int ino);
+static struct buffer_head * bfs_find_entry(struct inode * dir, 
+        const char * name, int namelen, struct bfs_dirent ** res_dir);
+
+static int bfs_readdir(struct file * f, void * dirent, filldir_t filldir)
+{
+        struct inode * dir = f->f_dentry->d_inode;
+        struct buffer_head * bh;
+        struct bfs_dirent * de;
+        unsigned int offset;
+        int block;
+
+        lock_kernel();
+
+        if (f->f_pos & (BFS_DIRENT_SIZE-1)) {
+                printf("Bad f_pos=%08lx for %s:%08lx\n", (unsigned long)f->f_pos, 
+                        dir->i_sb->s_id, dir->i_ino);
+                unlock_kernel();
+                return -EBADF;
+        }
+
+        while (f->f_pos < dir->i_size) {
+                offset = f->f_pos & (BFS_BSIZE-1);
+                block = BFS_I(dir)->i_sblock + (f->f_pos >> BFS_BSIZE_BITS);
+                bh = sb_bread(dir->i_sb, block);
+                if (!bh) {
+                        f->f_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 (filldir(dirent, de->name, size, f->f_pos, de->ino, DT_UNKNOWN) < 0) {
+                                        brelse(bh);
+                                        unlock_kernel();
+                                        return 0;
+                                }
+                        }
+                        offset += BFS_DIRENT_SIZE;
+                        f->f_pos += BFS_DIRENT_SIZE;
+                } while (offset < BFS_BSIZE && f->f_pos < dir->i_size);
+                brelse(bh);
+        }
+
+        unlock_kernel();
+        return 0;       
+}
+
+struct file_operations bfs_dir_operations = {
+        .read           = generic_read_dir,
+        .readdir        = bfs_readdir,
+        .fsync          = file_fsync,
+};
+
+extern void dump_imap(const char *, struct super_block *);
+
+static int bfs_create(struct inode * dir, struct dentry * dentry, int mode,
+                struct nameidata *nd)
+{
+        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 -ENOSPC;
+        lock_kernel();
+        ino = find_first_zero_bit(info->si_imap, info->si_lasti);
+        if (ino > info->si_lasti) {
+                unlock_kernel();
+                iput(inode);
+                return -ENOSPC;
+        }
+        set_bit(ino, info->si_imap);    
+        info->si_freei--;
+        inode->i_uid = current->fsuid;
+        inode->i_gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
+        inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
+        inode->i_blocks = inode->i_blksize = 0;
+        inode->i_op = &bfs_file_inops;
+        inode->i_fop = &bfs_file_operations;
+        inode->i_mapping->a_ops = &bfs_aops;
+        inode->i_mode = mode;
+        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);
+        dump_imap("create",s);
+
+        err = bfs_add_entry(dir, dentry->d_name.name, dentry->d_name.len, inode->i_ino);
+        if (err) {
+                inode->i_nlink--;
+                mark_inode_dirty(inode);
+                iput(inode);
+                unlock_kernel();
+                return err;
+        }
+        unlock_kernel();
+        d_instantiate(dentry, inode);
+        return 0;
+}
+
+static struct dentry * bfs_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
+{
+        struct inode * inode = NULL;
+        struct buffer_head * bh;
+        struct bfs_dirent * de;
+
+        if (dentry->d_name.len > BFS_NAMELEN)
+                return ERR_PTR(-ENAMETOOLONG);
+
+        lock_kernel();
+        bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
+        if (bh) {
+                unsigned long ino = le32_to_cpu(de->ino);
+                brelse(bh);
+                inode = iget(dir->i_sb, ino);
+                if (!inode) {
+                        unlock_kernel();
+                        return ERR_PTR(-EACCES);
+                }
+        }
+        unlock_kernel();
+        d_add(dentry, inode);
+        return NULL;
+}
+
+static int bfs_link(struct dentry * old, struct inode * dir, struct dentry * new)
+{
+        struct inode * inode = old->d_inode;
+        int err;
+
+        lock_kernel();
+        err = bfs_add_entry(dir, new->d_name.name, new->d_name.len, inode->i_ino);
+        if (err) {
+                unlock_kernel();
+                return err;
+        }
+        inode->i_nlink++;
+        inode->i_ctime = CURRENT_TIME_SEC;
+        mark_inode_dirty(inode);
+        atomic_inc(&inode->i_count);
+        d_instantiate(new, inode);
+        unlock_kernel();
+        return 0;
+}
+
+
+static int bfs_unlink(struct inode * dir, struct dentry * dentry)
+{
+        int error = -ENOENT;
+        struct inode * inode;
+        struct buffer_head * bh;
+        struct bfs_dirent * de;
+
+        inode = dentry->d_inode;
+        lock_kernel();
+        bh = bfs_find_entry(dir, dentry->d_name.name, dentry->d_name.len, &de);
+        if (!bh || 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);
+                inode->i_nlink = 1;
+        }
+        de->ino = 0;
+        mark_buffer_dirty(bh);
+        dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
+        mark_inode_dirty(dir);
+        inode->i_nlink--;
+        inode->i_ctime = dir->i_ctime;
+        mark_inode_dirty(inode);
+        error = 0;
+
+out_brelse:
+        brelse(bh);
+        unlock_kernel();
+        return error;
+}
+
+static int bfs_rename(struct inode * old_dir, struct dentry * old_dentry, 
+                        struct inode * new_dir, struct dentry * new_dentry)
+{
+        struct inode * old_inode, * new_inode;
+        struct buffer_head * old_bh, * new_bh;
+        struct bfs_dirent * old_de, * new_de;           
+        int error = -ENOENT;
+
+        old_bh = new_bh = NULL;
+        old_inode = old_dentry->d_inode;
+        if (S_ISDIR(old_inode->i_mode))
+                return -EINVAL;
+
+        lock_kernel();
+        old_bh = bfs_find_entry(old_dir, 
+                                old_dentry->d_name.name, 
+                                old_dentry->d_name.len, &old_de);
+
+        if (!old_bh || old_de->ino != old_inode->i_ino)
+                goto end_rename;
+
+        error = -EPERM;
+        new_inode = new_dentry->d_inode;
+        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_SEC;
+        mark_inode_dirty(old_dir);
+        if (new_inode) {
+                new_inode->i_nlink--;
+                new_inode->i_ctime = CURRENT_TIME_SEC;
+                mark_inode_dirty(new_inode);
+        }
+        mark_buffer_dirty(old_bh);
+        error = 0;
+
+end_rename:
+        unlock_kernel();
+        brelse(old_bh);
+        brelse(new_bh);
+        return error;
+}
+
+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 char * name, int namelen, int ino)
+{
+        struct buffer_head * bh;
+        struct bfs_dirent * de;
+        int block, sblock, eblock, off, eoff;
+        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;
+        eoff = dir->i_size % BFS_BSIZE;
+        for (block=sblock; block<=eblock; block++) {
+                bh = sb_bread(dir->i_sb, block);
+                if(!bh) 
+                        return -ENOSPC;
+                for (off=0; off<BFS_BSIZE; off+=BFS_DIRENT_SIZE) {
+                        de = (struct bfs_dirent *)(bh->b_data + off);
+                        if (block==eblock && off>=eoff) {
+                                /* Do not read/interpret the garbage in the end of eblock. */
+                                de->ino = 0;
+                        }
+                        if (!de->ino) {
+                                if ((block-sblock)*BFS_BSIZE + off >= dir->i_size) {
+                                        dir->i_size += BFS_DIRENT_SIZE;
+                                        dir->i_ctime = CURRENT_TIME_SEC;
+                                }
+                                dir->i_mtime = CURRENT_TIME_SEC;
+                                mark_inode_dirty(dir);
+                                de->ino = ino;
+                                for (i=0; i<BFS_NAMELEN; i++)
+                                        de->name[i] = (i < namelen) ? name[i] : 0;
+                                mark_buffer_dirty(bh);
+                                brelse(bh);
+                                return 0;
+                        }
+                }
+                brelse(bh);
+        }
+        return -ENOSPC;
+}
+
+static inline int bfs_namecmp(int len, const char * name, const char * buffer)
+{
+        if (len < BFS_NAMELEN && buffer[len])
+                return 0;
+        return !memcmp(name, buffer, len);
+}
+
+static struct buffer_head * bfs_find_entry(struct inode * dir, 
+        const char * name, int namelen, struct bfs_dirent ** res_dir)
+{
+        unsigned long block, offset;
+        struct buffer_head * bh;
+        struct bfs_dirent * de;
+
+        *res_dir = NULL;
+        if (namelen > BFS_NAMELEN)
+                return NULL;
+        bh = NULL;
+        block = offset = 0;
+        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 (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;
+}