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fs/befs/io.c
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/* * 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; } |