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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/udf/lowlevel.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
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!
Diffstat (limited to 'fs/udf/lowlevel.c')
-rw-r--r-- | fs/udf/lowlevel.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/fs/udf/lowlevel.c b/fs/udf/lowlevel.c new file mode 100644 index 000000000000..2da5087dfe05 --- /dev/null +++ b/fs/udf/lowlevel.c @@ -0,0 +1,77 @@ +/* + * lowlevel.c + * + * PURPOSE + * Low Level Device Routines for the UDF filesystem + * + * CONTACTS + * E-mail regarding any portion of the Linux UDF file system should be + * directed to the development team mailing list (run by majordomo): + * linux_udf@hpesjro.fc.hp.com + * + * COPYRIGHT + * This file is distributed under the terms of the GNU General Public + * License (GPL). Copies of the GPL can be obtained from: + * ftp://prep.ai.mit.edu/pub/gnu/GPL + * Each contributing author retains all rights to their own work. + * + * (C) 1999-2001 Ben Fennema + * + * HISTORY + * + * 03/26/99 blf Created. + */ + +#include "udfdecl.h" + +#include <linux/blkdev.h> +#include <linux/cdrom.h> +#include <asm/uaccess.h> + +#include <linux/udf_fs.h> +#include "udf_sb.h" + +unsigned int +udf_get_last_session(struct super_block *sb) +{ + struct cdrom_multisession ms_info; + unsigned int vol_desc_start; + struct block_device *bdev = sb->s_bdev; + int i; + + vol_desc_start=0; + ms_info.addr_format=CDROM_LBA; + i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info); + +#define WE_OBEY_THE_WRITTEN_STANDARDS 1 + + if (i == 0) + { + udf_debug("XA disk: %s, vol_desc_start=%d\n", + (ms_info.xa_flag ? "yes" : "no"), ms_info.addr.lba); +#if WE_OBEY_THE_WRITTEN_STANDARDS + if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */ +#endif + vol_desc_start = ms_info.addr.lba; + } + else + { + udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i); + } + return vol_desc_start; +} + +unsigned long +udf_get_last_block(struct super_block *sb) +{ + struct block_device *bdev = sb->s_bdev; + unsigned long lblock = 0; + + if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock)) + lblock = bdev->bd_inode->i_size >> sb->s_blocksize_bits; + + if (lblock) + return lblock - 1; + else + return 0; +} |