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![David Howells](/assets/img/avatar_default.png)
Implement the show_options superblock op for omfs as part of a bid to get rid of s_options and generic_show_options() to make it easier to implement a context-based mount where the mount options can be passed individually over a file descriptor. Note that the uid and gid should possibly be displayed relative to the viewer's user namespace. Signed-off-by: David Howells <dhowells@redhat.com> cc: Bob Copeland <me@bobcopeland.com> cc: linux-karma-devel@lists.sourceforge.net Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
624 lines
14 KiB
C
624 lines
14 KiB
C
/*
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* Optimized MPEG FS - inode and super operations.
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* Copyright (C) 2006 Bob Copeland <me@bobcopeland.com>
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* Released under GPL v2.
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/vfs.h>
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#include <linux/cred.h>
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#include <linux/parser.h>
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#include <linux/buffer_head.h>
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#include <linux/vmalloc.h>
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#include <linux/writeback.h>
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#include <linux/seq_file.h>
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#include <linux/crc-itu-t.h>
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#include "omfs.h"
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MODULE_AUTHOR("Bob Copeland <me@bobcopeland.com>");
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MODULE_DESCRIPTION("OMFS (ReplayTV/Karma) Filesystem for Linux");
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MODULE_LICENSE("GPL");
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struct buffer_head *omfs_bread(struct super_block *sb, sector_t block)
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{
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struct omfs_sb_info *sbi = OMFS_SB(sb);
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if (block >= sbi->s_num_blocks)
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return NULL;
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return sb_bread(sb, clus_to_blk(sbi, block));
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}
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struct inode *omfs_new_inode(struct inode *dir, umode_t mode)
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{
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struct inode *inode;
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u64 new_block;
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int err;
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int len;
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struct omfs_sb_info *sbi = OMFS_SB(dir->i_sb);
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inode = new_inode(dir->i_sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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err = omfs_allocate_range(dir->i_sb, sbi->s_mirrors, sbi->s_mirrors,
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&new_block, &len);
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if (err)
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goto fail;
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inode->i_ino = new_block;
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inode_init_owner(inode, NULL, mode);
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inode->i_mapping->a_ops = &omfs_aops;
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inode->i_atime = inode->i_mtime = inode->i_ctime = current_time(inode);
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switch (mode & S_IFMT) {
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case S_IFDIR:
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inode->i_op = &omfs_dir_inops;
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inode->i_fop = &omfs_dir_operations;
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inode->i_size = sbi->s_sys_blocksize;
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inc_nlink(inode);
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break;
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case S_IFREG:
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inode->i_op = &omfs_file_inops;
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inode->i_fop = &omfs_file_operations;
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inode->i_size = 0;
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break;
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}
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insert_inode_hash(inode);
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mark_inode_dirty(inode);
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return inode;
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fail:
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make_bad_inode(inode);
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iput(inode);
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return ERR_PTR(err);
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}
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/*
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* Update the header checksums for a dirty inode based on its contents.
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* Caller is expected to hold the buffer head underlying oi and mark it
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* dirty.
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*/
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static void omfs_update_checksums(struct omfs_inode *oi)
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{
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int xor, i, ofs = 0, count;
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u16 crc = 0;
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unsigned char *ptr = (unsigned char *) oi;
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count = be32_to_cpu(oi->i_head.h_body_size);
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ofs = sizeof(struct omfs_header);
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crc = crc_itu_t(crc, ptr + ofs, count);
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oi->i_head.h_crc = cpu_to_be16(crc);
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xor = ptr[0];
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for (i = 1; i < OMFS_XOR_COUNT; i++)
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xor ^= ptr[i];
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oi->i_head.h_check_xor = xor;
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}
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static int __omfs_write_inode(struct inode *inode, int wait)
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{
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struct omfs_inode *oi;
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struct omfs_sb_info *sbi = OMFS_SB(inode->i_sb);
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struct buffer_head *bh, *bh2;
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u64 ctime;
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int i;
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int ret = -EIO;
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int sync_failed = 0;
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/* get current inode since we may have written sibling ptrs etc. */
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bh = omfs_bread(inode->i_sb, inode->i_ino);
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if (!bh)
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goto out;
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oi = (struct omfs_inode *) bh->b_data;
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oi->i_head.h_self = cpu_to_be64(inode->i_ino);
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if (S_ISDIR(inode->i_mode))
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oi->i_type = OMFS_DIR;
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else if (S_ISREG(inode->i_mode))
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oi->i_type = OMFS_FILE;
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else {
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printk(KERN_WARNING "omfs: unknown file type: %d\n",
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inode->i_mode);
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goto out_brelse;
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}
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oi->i_head.h_body_size = cpu_to_be32(sbi->s_sys_blocksize -
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sizeof(struct omfs_header));
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oi->i_head.h_version = 1;
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oi->i_head.h_type = OMFS_INODE_NORMAL;
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oi->i_head.h_magic = OMFS_IMAGIC;
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oi->i_size = cpu_to_be64(inode->i_size);
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ctime = inode->i_ctime.tv_sec * 1000LL +
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((inode->i_ctime.tv_nsec + 999)/1000);
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oi->i_ctime = cpu_to_be64(ctime);
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omfs_update_checksums(oi);
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mark_buffer_dirty(bh);
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if (wait) {
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sync_dirty_buffer(bh);
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if (buffer_req(bh) && !buffer_uptodate(bh))
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sync_failed = 1;
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}
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/* if mirroring writes, copy to next fsblock */
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for (i = 1; i < sbi->s_mirrors; i++) {
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bh2 = omfs_bread(inode->i_sb, inode->i_ino + i);
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if (!bh2)
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goto out_brelse;
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memcpy(bh2->b_data, bh->b_data, bh->b_size);
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mark_buffer_dirty(bh2);
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if (wait) {
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sync_dirty_buffer(bh2);
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if (buffer_req(bh2) && !buffer_uptodate(bh2))
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sync_failed = 1;
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}
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brelse(bh2);
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}
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ret = (sync_failed) ? -EIO : 0;
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out_brelse:
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brelse(bh);
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out:
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return ret;
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}
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static int omfs_write_inode(struct inode *inode, struct writeback_control *wbc)
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{
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return __omfs_write_inode(inode, wbc->sync_mode == WB_SYNC_ALL);
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}
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int omfs_sync_inode(struct inode *inode)
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{
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return __omfs_write_inode(inode, 1);
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}
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/*
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* called when an entry is deleted, need to clear the bits in the
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* bitmaps.
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*/
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static void omfs_evict_inode(struct inode *inode)
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{
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truncate_inode_pages_final(&inode->i_data);
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clear_inode(inode);
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if (inode->i_nlink)
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return;
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if (S_ISREG(inode->i_mode)) {
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inode->i_size = 0;
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omfs_shrink_inode(inode);
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}
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omfs_clear_range(inode->i_sb, inode->i_ino, 2);
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}
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struct inode *omfs_iget(struct super_block *sb, ino_t ino)
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{
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struct omfs_sb_info *sbi = OMFS_SB(sb);
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struct omfs_inode *oi;
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struct buffer_head *bh;
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u64 ctime;
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unsigned long nsecs;
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struct inode *inode;
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inode = iget_locked(sb, ino);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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bh = omfs_bread(inode->i_sb, ino);
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if (!bh)
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goto iget_failed;
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oi = (struct omfs_inode *)bh->b_data;
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/* check self */
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if (ino != be64_to_cpu(oi->i_head.h_self))
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goto fail_bh;
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inode->i_uid = sbi->s_uid;
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inode->i_gid = sbi->s_gid;
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ctime = be64_to_cpu(oi->i_ctime);
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nsecs = do_div(ctime, 1000) * 1000L;
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inode->i_atime.tv_sec = ctime;
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inode->i_mtime.tv_sec = ctime;
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inode->i_ctime.tv_sec = ctime;
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inode->i_atime.tv_nsec = nsecs;
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inode->i_mtime.tv_nsec = nsecs;
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inode->i_ctime.tv_nsec = nsecs;
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inode->i_mapping->a_ops = &omfs_aops;
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switch (oi->i_type) {
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case OMFS_DIR:
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inode->i_mode = S_IFDIR | (S_IRWXUGO & ~sbi->s_dmask);
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inode->i_op = &omfs_dir_inops;
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inode->i_fop = &omfs_dir_operations;
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inode->i_size = sbi->s_sys_blocksize;
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inc_nlink(inode);
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break;
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case OMFS_FILE:
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inode->i_mode = S_IFREG | (S_IRWXUGO & ~sbi->s_fmask);
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inode->i_fop = &omfs_file_operations;
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inode->i_size = be64_to_cpu(oi->i_size);
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break;
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}
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brelse(bh);
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unlock_new_inode(inode);
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return inode;
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fail_bh:
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brelse(bh);
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iget_failed:
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iget_failed(inode);
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return ERR_PTR(-EIO);
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}
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static void omfs_put_super(struct super_block *sb)
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{
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struct omfs_sb_info *sbi = OMFS_SB(sb);
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kfree(sbi->s_imap);
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kfree(sbi);
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sb->s_fs_info = NULL;
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}
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static int omfs_statfs(struct dentry *dentry, struct kstatfs *buf)
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{
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struct super_block *s = dentry->d_sb;
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struct omfs_sb_info *sbi = OMFS_SB(s);
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u64 id = huge_encode_dev(s->s_bdev->bd_dev);
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buf->f_type = OMFS_MAGIC;
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buf->f_bsize = sbi->s_blocksize;
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buf->f_blocks = sbi->s_num_blocks;
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buf->f_files = sbi->s_num_blocks;
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buf->f_namelen = OMFS_NAMELEN;
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buf->f_fsid.val[0] = (u32)id;
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buf->f_fsid.val[1] = (u32)(id >> 32);
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buf->f_bfree = buf->f_bavail = buf->f_ffree =
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omfs_count_free(s);
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return 0;
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}
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/*
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* Display the mount options in /proc/mounts.
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*/
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static int omfs_show_options(struct seq_file *m, struct dentry *root)
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{
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struct omfs_sb_info *sbi = OMFS_SB(root->d_sb);
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umode_t cur_umask = current_umask();
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if (!uid_eq(sbi->s_uid, current_uid()))
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seq_printf(m, ",uid=%u",
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from_kuid_munged(&init_user_ns, sbi->s_uid));
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if (!gid_eq(sbi->s_gid, current_gid()))
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seq_printf(m, ",gid=%u",
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from_kgid_munged(&init_user_ns, sbi->s_gid));
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if (sbi->s_dmask == sbi->s_fmask) {
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if (sbi->s_fmask != cur_umask)
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seq_printf(m, ",umask=%o", sbi->s_fmask);
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} else {
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if (sbi->s_dmask != cur_umask)
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seq_printf(m, ",dmask=%o", sbi->s_dmask);
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if (sbi->s_fmask != cur_umask)
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seq_printf(m, ",fmask=%o", sbi->s_fmask);
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}
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return 0;
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}
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static const struct super_operations omfs_sops = {
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.write_inode = omfs_write_inode,
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.evict_inode = omfs_evict_inode,
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.put_super = omfs_put_super,
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.statfs = omfs_statfs,
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.show_options = omfs_show_options,
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};
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/*
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* For Rio Karma, there is an on-disk free bitmap whose location is
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* stored in the root block. For ReplayTV, there is no such free bitmap
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* so we have to walk the tree. Both inodes and file data are allocated
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* from the same map. This array can be big (300k) so we allocate
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* in units of the blocksize.
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*/
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static int omfs_get_imap(struct super_block *sb)
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{
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unsigned int bitmap_size, array_size;
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int count;
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struct omfs_sb_info *sbi = OMFS_SB(sb);
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struct buffer_head *bh;
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unsigned long **ptr;
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sector_t block;
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bitmap_size = DIV_ROUND_UP(sbi->s_num_blocks, 8);
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array_size = DIV_ROUND_UP(bitmap_size, sb->s_blocksize);
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if (sbi->s_bitmap_ino == ~0ULL)
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goto out;
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sbi->s_imap_size = array_size;
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sbi->s_imap = kcalloc(array_size, sizeof(unsigned long *), GFP_KERNEL);
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if (!sbi->s_imap)
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goto nomem;
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block = clus_to_blk(sbi, sbi->s_bitmap_ino);
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if (block >= sbi->s_num_blocks)
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goto nomem;
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ptr = sbi->s_imap;
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for (count = bitmap_size; count > 0; count -= sb->s_blocksize) {
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bh = sb_bread(sb, block++);
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if (!bh)
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goto nomem_free;
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*ptr = kmalloc(sb->s_blocksize, GFP_KERNEL);
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if (!*ptr) {
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brelse(bh);
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goto nomem_free;
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}
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memcpy(*ptr, bh->b_data, sb->s_blocksize);
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if (count < sb->s_blocksize)
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memset((void *)*ptr + count, 0xff,
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sb->s_blocksize - count);
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brelse(bh);
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ptr++;
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}
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out:
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return 0;
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nomem_free:
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for (count = 0; count < array_size; count++)
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kfree(sbi->s_imap[count]);
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kfree(sbi->s_imap);
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nomem:
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sbi->s_imap = NULL;
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sbi->s_imap_size = 0;
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return -ENOMEM;
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}
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enum {
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Opt_uid, Opt_gid, Opt_umask, Opt_dmask, Opt_fmask, Opt_err
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};
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static const match_table_t tokens = {
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{Opt_uid, "uid=%u"},
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{Opt_gid, "gid=%u"},
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{Opt_umask, "umask=%o"},
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{Opt_dmask, "dmask=%o"},
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{Opt_fmask, "fmask=%o"},
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{Opt_err, NULL},
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};
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static int parse_options(char *options, struct omfs_sb_info *sbi)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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if (!options)
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return 1;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_uid:
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if (match_int(&args[0], &option))
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return 0;
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sbi->s_uid = make_kuid(current_user_ns(), option);
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if (!uid_valid(sbi->s_uid))
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return 0;
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break;
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case Opt_gid:
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if (match_int(&args[0], &option))
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return 0;
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sbi->s_gid = make_kgid(current_user_ns(), option);
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if (!gid_valid(sbi->s_gid))
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return 0;
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break;
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case Opt_umask:
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if (match_octal(&args[0], &option))
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return 0;
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sbi->s_fmask = sbi->s_dmask = option;
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break;
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case Opt_dmask:
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if (match_octal(&args[0], &option))
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return 0;
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sbi->s_dmask = option;
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break;
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case Opt_fmask:
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if (match_octal(&args[0], &option))
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return 0;
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sbi->s_fmask = option;
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break;
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default:
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return 0;
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}
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}
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return 1;
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}
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static int omfs_fill_super(struct super_block *sb, void *data, int silent)
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{
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struct buffer_head *bh, *bh2;
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struct omfs_super_block *omfs_sb;
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struct omfs_root_block *omfs_rb;
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struct omfs_sb_info *sbi;
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struct inode *root;
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int ret = -EINVAL;
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sbi = kzalloc(sizeof(struct omfs_sb_info), GFP_KERNEL);
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if (!sbi)
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return -ENOMEM;
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sb->s_fs_info = sbi;
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sbi->s_uid = current_uid();
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sbi->s_gid = current_gid();
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sbi->s_dmask = sbi->s_fmask = current_umask();
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if (!parse_options((char *) data, sbi))
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goto end;
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sb->s_maxbytes = 0xffffffff;
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sb_set_blocksize(sb, 0x200);
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bh = sb_bread(sb, 0);
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if (!bh)
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goto end;
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omfs_sb = (struct omfs_super_block *)bh->b_data;
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if (omfs_sb->s_magic != cpu_to_be32(OMFS_MAGIC)) {
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if (!silent)
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printk(KERN_ERR "omfs: Invalid superblock (%x)\n",
|
|
omfs_sb->s_magic);
|
|
goto out_brelse_bh;
|
|
}
|
|
sb->s_magic = OMFS_MAGIC;
|
|
|
|
sbi->s_num_blocks = be64_to_cpu(omfs_sb->s_num_blocks);
|
|
sbi->s_blocksize = be32_to_cpu(omfs_sb->s_blocksize);
|
|
sbi->s_mirrors = be32_to_cpu(omfs_sb->s_mirrors);
|
|
sbi->s_root_ino = be64_to_cpu(omfs_sb->s_root_block);
|
|
sbi->s_sys_blocksize = be32_to_cpu(omfs_sb->s_sys_blocksize);
|
|
mutex_init(&sbi->s_bitmap_lock);
|
|
|
|
if (sbi->s_num_blocks > OMFS_MAX_BLOCKS) {
|
|
printk(KERN_ERR "omfs: sysblock number (%llx) is out of range\n",
|
|
(unsigned long long)sbi->s_num_blocks);
|
|
goto out_brelse_bh;
|
|
}
|
|
|
|
if (sbi->s_sys_blocksize > PAGE_SIZE) {
|
|
printk(KERN_ERR "omfs: sysblock size (%d) is out of range\n",
|
|
sbi->s_sys_blocksize);
|
|
goto out_brelse_bh;
|
|
}
|
|
|
|
if (sbi->s_blocksize < sbi->s_sys_blocksize ||
|
|
sbi->s_blocksize > OMFS_MAX_BLOCK_SIZE) {
|
|
printk(KERN_ERR "omfs: block size (%d) is out of range\n",
|
|
sbi->s_blocksize);
|
|
goto out_brelse_bh;
|
|
}
|
|
|
|
/*
|
|
* Use sys_blocksize as the fs block since it is smaller than a
|
|
* page while the fs blocksize can be larger.
|
|
*/
|
|
sb_set_blocksize(sb, sbi->s_sys_blocksize);
|
|
|
|
/*
|
|
* ...and the difference goes into a shift. sys_blocksize is always
|
|
* a power of two factor of blocksize.
|
|
*/
|
|
sbi->s_block_shift = get_bitmask_order(sbi->s_blocksize) -
|
|
get_bitmask_order(sbi->s_sys_blocksize);
|
|
|
|
bh2 = omfs_bread(sb, be64_to_cpu(omfs_sb->s_root_block));
|
|
if (!bh2)
|
|
goto out_brelse_bh;
|
|
|
|
omfs_rb = (struct omfs_root_block *)bh2->b_data;
|
|
|
|
sbi->s_bitmap_ino = be64_to_cpu(omfs_rb->r_bitmap);
|
|
sbi->s_clustersize = be32_to_cpu(omfs_rb->r_clustersize);
|
|
|
|
if (sbi->s_num_blocks != be64_to_cpu(omfs_rb->r_num_blocks)) {
|
|
printk(KERN_ERR "omfs: block count discrepancy between "
|
|
"super and root blocks (%llx, %llx)\n",
|
|
(unsigned long long)sbi->s_num_blocks,
|
|
(unsigned long long)be64_to_cpu(omfs_rb->r_num_blocks));
|
|
goto out_brelse_bh2;
|
|
}
|
|
|
|
if (sbi->s_bitmap_ino != ~0ULL &&
|
|
sbi->s_bitmap_ino > sbi->s_num_blocks) {
|
|
printk(KERN_ERR "omfs: free space bitmap location is corrupt "
|
|
"(%llx, total blocks %llx)\n",
|
|
(unsigned long long) sbi->s_bitmap_ino,
|
|
(unsigned long long) sbi->s_num_blocks);
|
|
goto out_brelse_bh2;
|
|
}
|
|
if (sbi->s_clustersize < 1 ||
|
|
sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) {
|
|
printk(KERN_ERR "omfs: cluster size out of range (%d)",
|
|
sbi->s_clustersize);
|
|
goto out_brelse_bh2;
|
|
}
|
|
|
|
ret = omfs_get_imap(sb);
|
|
if (ret)
|
|
goto out_brelse_bh2;
|
|
|
|
sb->s_op = &omfs_sops;
|
|
|
|
root = omfs_iget(sb, be64_to_cpu(omfs_rb->r_root_dir));
|
|
if (IS_ERR(root)) {
|
|
ret = PTR_ERR(root);
|
|
goto out_brelse_bh2;
|
|
}
|
|
|
|
sb->s_root = d_make_root(root);
|
|
if (!sb->s_root) {
|
|
ret = -ENOMEM;
|
|
goto out_brelse_bh2;
|
|
}
|
|
printk(KERN_DEBUG "omfs: Mounted volume %s\n", omfs_rb->r_name);
|
|
|
|
ret = 0;
|
|
out_brelse_bh2:
|
|
brelse(bh2);
|
|
out_brelse_bh:
|
|
brelse(bh);
|
|
end:
|
|
if (ret)
|
|
kfree(sbi);
|
|
return ret;
|
|
}
|
|
|
|
static struct dentry *omfs_mount(struct file_system_type *fs_type,
|
|
int flags, const char *dev_name, void *data)
|
|
{
|
|
return mount_bdev(fs_type, flags, dev_name, data, omfs_fill_super);
|
|
}
|
|
|
|
static struct file_system_type omfs_fs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "omfs",
|
|
.mount = omfs_mount,
|
|
.kill_sb = kill_block_super,
|
|
.fs_flags = FS_REQUIRES_DEV,
|
|
};
|
|
MODULE_ALIAS_FS("omfs");
|
|
|
|
static int __init init_omfs_fs(void)
|
|
{
|
|
return register_filesystem(&omfs_fs_type);
|
|
}
|
|
|
|
static void __exit exit_omfs_fs(void)
|
|
{
|
|
unregister_filesystem(&omfs_fs_type);
|
|
}
|
|
|
|
module_init(init_omfs_fs);
|
|
module_exit(exit_omfs_fs);
|