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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/befs/io.c
downloadlinux-sh-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
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/befs/io.c')
-rw-r--r--fs/befs/io.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/fs/befs/io.c b/fs/befs/io.c
new file mode 100644
index 000000000000..ddef98aa255d
--- /dev/null
+++ b/fs/befs/io.c
@@ -0,0 +1,83 @@
+/*
+ * linux/fs/befs/io.c
+ *
+ * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com
+ *
+ * Based on portions of file.c and inode.c
+ * by Makoto Kato (m_kato@ga2.so-net.ne.jp)
+ *
+ * Many thanks to Dominic Giampaolo, author of Practical File System
+ * Design with the Be File System, for such a helpful book.
+ *
+ */
+
+#include <linux/buffer_head.h>
+
+#include "befs.h"
+#include "io.h"
+
+/*
+ * Converts befs notion of disk addr to a disk offset and uses
+ * linux kernel function sb_bread() to get the buffer containing
+ * the offset. -Will Dyson
+ *
+ */
+
+struct buffer_head *
+befs_bread_iaddr(struct super_block *sb, befs_inode_addr iaddr)
+{
+ struct buffer_head *bh = NULL;
+ befs_blocknr_t block = 0;
+ befs_sb_info *befs_sb = BEFS_SB(sb);
+
+ befs_debug(sb, "---> Enter befs_read_iaddr() "
+ "[%u, %hu, %hu]",
+ iaddr.allocation_group, iaddr.start, iaddr.len);
+
+ if (iaddr.allocation_group > befs_sb->num_ags) {
+ befs_error(sb, "BEFS: Invalid allocation group %u, max is %u",
+ iaddr.allocation_group, befs_sb->num_ags);
+ goto error;
+ }
+
+ block = iaddr2blockno(sb, &iaddr);
+
+ befs_debug(sb, "befs_read_iaddr: offset = %lu", block);
+
+ bh = sb_bread(sb, block);
+
+ if (bh == NULL) {
+ befs_error(sb, "Failed to read block %lu", block);
+ goto error;
+ }
+
+ befs_debug(sb, "<--- befs_read_iaddr()");
+ return bh;
+
+ error:
+ befs_debug(sb, "<--- befs_read_iaddr() ERROR");
+ return NULL;
+}
+
+struct buffer_head *
+befs_bread(struct super_block *sb, befs_blocknr_t block)
+{
+ struct buffer_head *bh = NULL;
+
+ befs_debug(sb, "---> Enter befs_read() %Lu", block);
+
+ bh = sb_bread(sb, block);
+
+ if (bh == NULL) {
+ befs_error(sb, "Failed to read block %lu", block);
+ goto error;
+ }
+
+ befs_debug(sb, "<--- befs_read()");
+
+ return bh;
+
+ error:
+ befs_debug(sb, "<--- befs_read() ERROR");
+ return NULL;
+}