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, 162 insertions, 0 deletions

diff --git a/fs/bfs/file.c b/fs/bfs/file.c
new file mode 100644
index 000000000000..747fd1ea55e0
--- /dev/null
+++ b/fs/bfs/file.c
@@ -0,0 +1,162 @@
+/*
+ *      fs/bfs/file.c
+ *      BFS file operations.
+ *      Copyright (C) 1999,2000 Tigran Aivazian <tigran@veritas.com>
+ */
+
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/smp_lock.h>
+#include "bfs.h"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define dprintf(x...)   printf(x)
+#else
+#define dprintf(x...)
+#endif
+
+struct file_operations bfs_file_operations = {
+        .llseek         = generic_file_llseek,
+        .read           = generic_file_read,
+        .write          = generic_file_write,
+        .mmap           = generic_file_mmap,
+        .sendfile       = generic_file_sendfile,
+};
+
+static int bfs_move_block(unsigned long from, unsigned long to, struct super_block *sb)
+{
+        struct buffer_head *bh, *new;
+
+        bh = sb_bread(sb, from);
+        if (!bh)
+                return -EIO;
+        new = sb_getblk(sb, to);
+        memcpy(new->b_data, bh->b_data, bh->b_size);
+        mark_buffer_dirty(new);
+        bforget(bh);
+        brelse(new);
+        return 0;
+}
+
+static int bfs_move_blocks(struct super_block *sb, unsigned long start, unsigned long end, 
+                                unsigned long where)
+{
+        unsigned long i;
+
+        dprintf("%08lx-%08lx->%08lx\n", start, end, where);
+        for (i = start; i <= end; i++)
+                if(bfs_move_block(i, where + i, sb)) {
+                        dprintf("failed to move block %08lx -> %08lx\n", i, where + i);
+                        return -EIO;
+                }
+        return 0;
+}
+
+static int bfs_get_block(struct inode * inode, sector_t block, 
+        struct buffer_head * bh_result, int create)
+{
+        long phys;
+        int err;
+        struct super_block *sb = inode->i_sb;
+        struct bfs_sb_info *info = BFS_SB(sb);
+        struct bfs_inode_info *bi = BFS_I(inode);
+        struct buffer_head *sbh = info->si_sbh;
+
+        if (block < 0 || block > info->si_blocks)
+                return -EIO;
+
+        phys = bi->i_sblock + block;
+        if (!create) {
+                if (phys <= bi->i_eblock) {
+                        dprintf("c=%d, b=%08lx, phys=%08lx (granted)\n", create, block, phys);
+                        map_bh(bh_result, sb, phys);
+                }
+                return 0;
+        }
+
+        /* if the file is not empty and the requested block is within the range
+           of blocks allocated for this file, we can grant it */
+        if (inode->i_size && phys <= bi->i_eblock) {
+                dprintf("c=%d, b=%08lx, phys=%08lx (interim block granted)\n", 
+                                create, block, phys);
+                map_bh(bh_result, sb, phys);
+                return 0;
+        }
+
+        /* the rest has to be protected against itself */
+        lock_kernel();
+
+        /* if the last data block for this file is the last allocated block, we can
+           extend the file trivially, without moving it anywhere */
+        if (bi->i_eblock == info->si_lf_eblk) {
+                dprintf("c=%d, b=%08lx, phys=%08lx (simple extension)\n", 
+                                create, block, phys);
+                map_bh(bh_result, sb, phys);
+                info->si_freeb -= phys - bi->i_eblock;
+                info->si_lf_eblk = bi->i_eblock = phys;
+                mark_inode_dirty(inode);
+                mark_buffer_dirty(sbh);
+                err = 0;
+                goto out;
+        }
+
+        /* Ok, we have to move this entire file to the next free block */
+        phys = info->si_lf_eblk + 1;
+        if (bi->i_sblock) { /* if data starts on block 0 then there is no data */
+                err = bfs_move_blocks(inode->i_sb, bi->i_sblock, 
+                                bi->i_eblock, phys);
+                if (err) {
+                        dprintf("failed to move ino=%08lx -> fs corruption\n", inode->i_ino);
+                        goto out;
+                }
+        } else
+                err = 0;
+
+        dprintf("c=%d, b=%08lx, phys=%08lx (moved)\n", create, block, phys);
+        bi->i_sblock = phys;
+        phys += block;
+        info->si_lf_eblk = bi->i_eblock = phys;
+
+        /* this assumes nothing can write the inode back while we are here
+         * and thus update inode->i_blocks! (XXX)*/
+        info->si_freeb -= bi->i_eblock - bi->i_sblock + 1 - inode->i_blocks;
+        mark_inode_dirty(inode);
+        mark_buffer_dirty(sbh);
+        map_bh(bh_result, sb, phys);
+out:
+        unlock_kernel();
+        return err;
+}
+
+static int bfs_writepage(struct page *page, struct writeback_control *wbc)
+{
+        return block_write_full_page(page, bfs_get_block, wbc);
+}
+
+static int bfs_readpage(struct file *file, struct page *page)
+{
+        return block_read_full_page(page, bfs_get_block);
+}
+
+static int bfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
+{
+        return block_prepare_write(page, from, to, bfs_get_block);
+}
+
+static sector_t bfs_bmap(struct address_space *mapping, sector_t block)
+{
+        return generic_block_bmap(mapping, block, bfs_get_block);
+}
+
+struct address_space_operations bfs_aops = {
+        .readpage       = bfs_readpage,
+        .writepage      = bfs_writepage,
+        .sync_page      = block_sync_page,
+        .prepare_write  = bfs_prepare_write,
+        .commit_write   = generic_commit_write,
+        .bmap           = bfs_bmap,
+};
+
+struct inode_operations bfs_file_inops;