Linux-2.6.12-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!
This commit is contained in:
Linus Torvalds
509
fs/affs/amigaffs.c
Normal file
509
fs/affs/amigaffs.c
Normal file
@@ -0,0 +1,509 @@
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/*
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* linux/fs/affs/amigaffs.c
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*
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* (c) 1996 Hans-Joachim Widmaier - Rewritten
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*
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* (C) 1993 Ray Burr - Amiga FFS filesystem.
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*
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* Please send bug reports to: hjw@zvw.de
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*/
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#include "affs.h"
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extern struct timezone sys_tz;
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static char ErrorBuffer[256];
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/*
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* Functions for accessing Amiga-FFS structures.
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*/
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/* Insert a header block bh into the directory dir
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* caller must hold AFFS_DIR->i_hash_lock!
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*/
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int
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affs_insert_hash(struct inode *dir, struct buffer_head *bh)
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{
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struct super_block *sb = dir->i_sb;
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struct buffer_head *dir_bh;
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u32 ino, hash_ino;
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int offset;
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ino = bh->b_blocknr;
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offset = affs_hash_name(sb, AFFS_TAIL(sb, bh)->name + 1, AFFS_TAIL(sb, bh)->name[0]);
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pr_debug("AFFS: insert_hash(dir=%u, ino=%d)\n", (u32)dir->i_ino, ino);
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dir_bh = affs_bread(sb, dir->i_ino);
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if (!dir_bh)
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return -EIO;
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hash_ino = be32_to_cpu(AFFS_HEAD(dir_bh)->table[offset]);
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while (hash_ino) {
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affs_brelse(dir_bh);
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dir_bh = affs_bread(sb, hash_ino);
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if (!dir_bh)
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return -EIO;
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hash_ino = be32_to_cpu(AFFS_TAIL(sb, dir_bh)->hash_chain);
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}
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AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
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AFFS_TAIL(sb, bh)->hash_chain = 0;
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affs_fix_checksum(sb, bh);
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if (dir->i_ino == dir_bh->b_blocknr)
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AFFS_HEAD(dir_bh)->table[offset] = cpu_to_be32(ino);
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else
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AFFS_TAIL(sb, dir_bh)->hash_chain = cpu_to_be32(ino);
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affs_adjust_checksum(dir_bh, ino);
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mark_buffer_dirty_inode(dir_bh, dir);
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affs_brelse(dir_bh);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
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dir->i_version++;
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mark_inode_dirty(dir);
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return 0;
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}
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/* Remove a header block from its directory.
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* caller must hold AFFS_DIR->i_hash_lock!
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*/
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int
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affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh)
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{
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struct super_block *sb;
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struct buffer_head *bh;
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u32 rem_ino, hash_ino;
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__be32 ino;
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int offset, retval;
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sb = dir->i_sb;
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rem_ino = rem_bh->b_blocknr;
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offset = affs_hash_name(sb, AFFS_TAIL(sb, rem_bh)->name+1, AFFS_TAIL(sb, rem_bh)->name[0]);
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pr_debug("AFFS: remove_hash(dir=%d, ino=%d, hashval=%d)\n", (u32)dir->i_ino, rem_ino, offset);
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bh = affs_bread(sb, dir->i_ino);
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if (!bh)
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return -EIO;
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retval = -ENOENT;
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hash_ino = be32_to_cpu(AFFS_HEAD(bh)->table[offset]);
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while (hash_ino) {
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if (hash_ino == rem_ino) {
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ino = AFFS_TAIL(sb, rem_bh)->hash_chain;
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if (dir->i_ino == bh->b_blocknr)
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AFFS_HEAD(bh)->table[offset] = ino;
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else
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AFFS_TAIL(sb, bh)->hash_chain = ino;
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affs_adjust_checksum(bh, be32_to_cpu(ino) - hash_ino);
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mark_buffer_dirty_inode(bh, dir);
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AFFS_TAIL(sb, rem_bh)->parent = 0;
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retval = 0;
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break;
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}
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affs_brelse(bh);
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bh = affs_bread(sb, hash_ino);
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if (!bh)
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return -EIO;
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hash_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->hash_chain);
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}
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affs_brelse(bh);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
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dir->i_version++;
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mark_inode_dirty(dir);
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return retval;
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}
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static void
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affs_fix_dcache(struct dentry *dentry, u32 entry_ino)
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{
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struct inode *inode = dentry->d_inode;
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void *data = dentry->d_fsdata;
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struct list_head *head, *next;
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spin_lock(&dcache_lock);
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head = &inode->i_dentry;
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next = head->next;
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while (next != head) {
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dentry = list_entry(next, struct dentry, d_alias);
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if (entry_ino == (u32)(long)dentry->d_fsdata) {
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dentry->d_fsdata = data;
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break;
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}
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next = next->next;
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}
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spin_unlock(&dcache_lock);
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}
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/* Remove header from link chain */
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static int
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affs_remove_link(struct dentry *dentry)
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{
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struct inode *dir, *inode = dentry->d_inode;
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struct super_block *sb = inode->i_sb;
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struct buffer_head *bh = NULL, *link_bh = NULL;
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u32 link_ino, ino;
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int retval;
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pr_debug("AFFS: remove_link(key=%ld)\n", inode->i_ino);
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retval = -EIO;
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bh = affs_bread(sb, inode->i_ino);
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if (!bh)
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goto done;
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link_ino = (u32)(long)dentry->d_fsdata;
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if (inode->i_ino == link_ino) {
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/* we can't remove the head of the link, as its blocknr is still used as ino,
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* so we remove the block of the first link instead.
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*/
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link_ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain);
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link_bh = affs_bread(sb, link_ino);
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if (!link_bh)
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goto done;
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dir = iget(sb, be32_to_cpu(AFFS_TAIL(sb, link_bh)->parent));
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if (!dir)
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goto done;
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affs_lock_dir(dir);
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affs_fix_dcache(dentry, link_ino);
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retval = affs_remove_hash(dir, link_bh);
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if (retval)
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goto done;
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mark_buffer_dirty_inode(link_bh, inode);
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memcpy(AFFS_TAIL(sb, bh)->name, AFFS_TAIL(sb, link_bh)->name, 32);
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retval = affs_insert_hash(dir, bh);
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if (retval)
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goto done;
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mark_buffer_dirty_inode(bh, inode);
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affs_unlock_dir(dir);
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iput(dir);
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} else {
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link_bh = affs_bread(sb, link_ino);
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if (!link_bh)
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goto done;
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}
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while ((ino = be32_to_cpu(AFFS_TAIL(sb, bh)->link_chain)) != 0) {
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if (ino == link_ino) {
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__be32 ino2 = AFFS_TAIL(sb, link_bh)->link_chain;
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AFFS_TAIL(sb, bh)->link_chain = ino2;
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affs_adjust_checksum(bh, be32_to_cpu(ino2) - link_ino);
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mark_buffer_dirty_inode(bh, inode);
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retval = 0;
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/* Fix the link count, if bh is a normal header block without links */
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switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
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case ST_LINKDIR:
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case ST_LINKFILE:
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break;
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default:
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if (!AFFS_TAIL(sb, bh)->link_chain)
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inode->i_nlink = 1;
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}
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affs_free_block(sb, link_ino);
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goto done;
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}
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affs_brelse(bh);
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bh = affs_bread(sb, ino);
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if (!bh)
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goto done;
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}
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retval = -ENOENT;
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done:
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affs_brelse(link_bh);
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affs_brelse(bh);
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return retval;
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}
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static int
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affs_empty_dir(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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struct buffer_head *bh;
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int retval, size;
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retval = -EIO;
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bh = affs_bread(sb, inode->i_ino);
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if (!bh)
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goto done;
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retval = -ENOTEMPTY;
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for (size = AFFS_SB(sb)->s_hashsize - 1; size >= 0; size--)
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if (AFFS_HEAD(bh)->table[size])
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goto not_empty;
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retval = 0;
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not_empty:
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affs_brelse(bh);
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done:
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return retval;
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}
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/* Remove a filesystem object. If the object to be removed has
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* links to it, one of the links must be changed to inherit
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* the file or directory. As above, any inode will do.
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* The buffer will not be freed. If the header is a link, the
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* block will be marked as free.
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* This function returns a negative error number in case of
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* an error, else 0 if the inode is to be deleted or 1 if not.
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*/
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int
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affs_remove_header(struct dentry *dentry)
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{
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struct super_block *sb;
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struct inode *inode, *dir;
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struct buffer_head *bh = NULL;
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int retval;
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dir = dentry->d_parent->d_inode;
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sb = dir->i_sb;
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retval = -ENOENT;
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inode = dentry->d_inode;
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if (!inode)
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goto done;
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pr_debug("AFFS: remove_header(key=%ld)\n", inode->i_ino);
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retval = -EIO;
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bh = affs_bread(sb, (u32)(long)dentry->d_fsdata);
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if (!bh)
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goto done;
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affs_lock_link(inode);
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affs_lock_dir(dir);
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switch (be32_to_cpu(AFFS_TAIL(sb, bh)->stype)) {
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case ST_USERDIR:
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||||
/* if we ever want to support links to dirs
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* i_hash_lock of the inode must only be
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||||
* taken after some checks
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||||
*/
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||||
affs_lock_dir(inode);
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||||
retval = affs_empty_dir(inode);
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||||
affs_unlock_dir(inode);
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||||
if (retval)
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||||
goto done_unlock;
|
||||
break;
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||||
default:
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||||
break;
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||||
}
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||||
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||||
retval = affs_remove_hash(dir, bh);
|
||||
if (retval)
|
||||
goto done_unlock;
|
||||
mark_buffer_dirty_inode(bh, inode);
|
||||
|
||||
affs_unlock_dir(dir);
|
||||
|
||||
if (inode->i_nlink > 1)
|
||||
retval = affs_remove_link(dentry);
|
||||
else
|
||||
inode->i_nlink = 0;
|
||||
affs_unlock_link(inode);
|
||||
inode->i_ctime = CURRENT_TIME_SEC;
|
||||
mark_inode_dirty(inode);
|
||||
|
||||
done:
|
||||
affs_brelse(bh);
|
||||
return retval;
|
||||
|
||||
done_unlock:
|
||||
affs_unlock_dir(dir);
|
||||
affs_unlock_link(inode);
|
||||
goto done;
|
||||
}
|
||||
|
||||
/* Checksum a block, do various consistency checks and optionally return
|
||||
the blocks type number. DATA points to the block. If their pointers
|
||||
are non-null, *PTYPE and *STYPE are set to the primary and secondary
|
||||
block types respectively, *HASHSIZE is set to the size of the hashtable
|
||||
(which lets us calculate the block size).
|
||||
Returns non-zero if the block is not consistent. */
|
||||
|
||||
u32
|
||||
affs_checksum_block(struct super_block *sb, struct buffer_head *bh)
|
||||
{
|
||||
__be32 *ptr = (__be32 *)bh->b_data;
|
||||
u32 sum;
|
||||
int bsize;
|
||||
|
||||
sum = 0;
|
||||
for (bsize = sb->s_blocksize / sizeof(__be32); bsize > 0; bsize--)
|
||||
sum += be32_to_cpu(*ptr++);
|
||||
return sum;
|
||||
}
|
||||
|
||||
/*
|
||||
* Calculate the checksum of a disk block and store it
|
||||
* at the indicated position.
|
||||
*/
|
||||
|
||||
void
|
||||
affs_fix_checksum(struct super_block *sb, struct buffer_head *bh)
|
||||
{
|
||||
int cnt = sb->s_blocksize / sizeof(__be32);
|
||||
__be32 *ptr = (__be32 *)bh->b_data;
|
||||
u32 checksum;
|
||||
__be32 *checksumptr;
|
||||
|
||||
checksumptr = ptr + 5;
|
||||
*checksumptr = 0;
|
||||
for (checksum = 0; cnt > 0; ptr++, cnt--)
|
||||
checksum += be32_to_cpu(*ptr);
|
||||
*checksumptr = cpu_to_be32(-checksum);
|
||||
}
|
||||
|
||||
void
|
||||
secs_to_datestamp(time_t secs, struct affs_date *ds)
|
||||
{
|
||||
u32 days;
|
||||
u32 minute;
|
||||
|
||||
secs -= sys_tz.tz_minuteswest * 60 + ((8 * 365 + 2) * 24 * 60 * 60);
|
||||
if (secs < 0)
|
||||
secs = 0;
|
||||
days = secs / 86400;
|
||||
secs -= days * 86400;
|
||||
minute = secs / 60;
|
||||
secs -= minute * 60;
|
||||
|
||||
ds->days = cpu_to_be32(days);
|
||||
ds->mins = cpu_to_be32(minute);
|
||||
ds->ticks = cpu_to_be32(secs * 50);
|
||||
}
|
||||
|
||||
mode_t
|
||||
prot_to_mode(u32 prot)
|
||||
{
|
||||
int mode = 0;
|
||||
|
||||
if (!(prot & FIBF_NOWRITE))
|
||||
mode |= S_IWUSR;
|
||||
if (!(prot & FIBF_NOREAD))
|
||||
mode |= S_IRUSR;
|
||||
if (!(prot & FIBF_NOEXECUTE))
|
||||
mode |= S_IXUSR;
|
||||
if (prot & FIBF_GRP_WRITE)
|
||||
mode |= S_IWGRP;
|
||||
if (prot & FIBF_GRP_READ)
|
||||
mode |= S_IRGRP;
|
||||
if (prot & FIBF_GRP_EXECUTE)
|
||||
mode |= S_IXGRP;
|
||||
if (prot & FIBF_OTR_WRITE)
|
||||
mode |= S_IWOTH;
|
||||
if (prot & FIBF_OTR_READ)
|
||||
mode |= S_IROTH;
|
||||
if (prot & FIBF_OTR_EXECUTE)
|
||||
mode |= S_IXOTH;
|
||||
|
||||
return mode;
|
||||
}
|
||||
|
||||
void
|
||||
mode_to_prot(struct inode *inode)
|
||||
{
|
||||
u32 prot = AFFS_I(inode)->i_protect;
|
||||
mode_t mode = inode->i_mode;
|
||||
|
||||
if (!(mode & S_IXUSR))
|
||||
prot |= FIBF_NOEXECUTE;
|
||||
if (!(mode & S_IRUSR))
|
||||
prot |= FIBF_NOREAD;
|
||||
if (!(mode & S_IWUSR))
|
||||
prot |= FIBF_NOWRITE;
|
||||
if (mode & S_IXGRP)
|
||||
prot |= FIBF_GRP_EXECUTE;
|
||||
if (mode & S_IRGRP)
|
||||
prot |= FIBF_GRP_READ;
|
||||
if (mode & S_IWGRP)
|
||||
prot |= FIBF_GRP_WRITE;
|
||||
if (mode & S_IXOTH)
|
||||
prot |= FIBF_OTR_EXECUTE;
|
||||
if (mode & S_IROTH)
|
||||
prot |= FIBF_OTR_READ;
|
||||
if (mode & S_IWOTH)
|
||||
prot |= FIBF_OTR_WRITE;
|
||||
|
||||
AFFS_I(inode)->i_protect = prot;
|
||||
}
|
||||
|
||||
void
|
||||
affs_error(struct super_block *sb, const char *function, const char *fmt, ...)
|
||||
{
|
||||
va_list args;
|
||||
|
||||
va_start(args,fmt);
|
||||
vsprintf(ErrorBuffer,fmt,args);
|
||||
va_end(args);
|
||||
|
||||
printk(KERN_CRIT "AFFS error (device %s): %s(): %s\n", sb->s_id,
|
||||
function,ErrorBuffer);
|
||||
if (!(sb->s_flags & MS_RDONLY))
|
||||
printk(KERN_WARNING "AFFS: Remounting filesystem read-only\n");
|
||||
sb->s_flags |= MS_RDONLY;
|
||||
}
|
||||
|
||||
void
|
||||
affs_warning(struct super_block *sb, const char *function, const char *fmt, ...)
|
||||
{
|
||||
va_list args;
|
||||
|
||||
va_start(args,fmt);
|
||||
vsprintf(ErrorBuffer,fmt,args);
|
||||
va_end(args);
|
||||
|
||||
printk(KERN_WARNING "AFFS warning (device %s): %s(): %s\n", sb->s_id,
|
||||
function,ErrorBuffer);
|
||||
}
|
||||
|
||||
/* Check if the name is valid for a affs object. */
|
||||
|
||||
int
|
||||
affs_check_name(const unsigned char *name, int len)
|
||||
{
|
||||
int i;
|
||||
|
||||
if (len > 30)
|
||||
#ifdef AFFS_NO_TRUNCATE
|
||||
return -ENAMETOOLONG;
|
||||
#else
|
||||
len = 30;
|
||||
#endif
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
if (name[i] < ' ' || name[i] == ':'
|
||||
|| (name[i] > 0x7e && name[i] < 0xa0))
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* This function copies name to bstr, with at most 30
|
||||
* characters length. The bstr will be prepended by
|
||||
* a length byte.
|
||||
* NOTE: The name will must be already checked by
|
||||
* affs_check_name()!
|
||||
*/
|
||||
|
||||
int
|
||||
affs_copy_name(unsigned char *bstr, struct dentry *dentry)
|
||||
{
|
||||
int len = min(dentry->d_name.len, 30u);
|
||||
|
||||
*bstr++ = len;
|
||||
memcpy(bstr, dentry->d_name.name, len);
|
||||
return len;
|
||||
}
|
||||
Reference in New Issue
Block a user