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xfs: add CRC checks to remote symlinks

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Add a header to the remote symlink block, containing location and
owner information, as well as CRCs and LSN fields. This requires
verifiers to be added to the remote symlink buffers for CRC enabled
filesystems.

This also fixes a bug reading multiple block symlinks, where the second
block overwrites the first block when copying out the link name.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Dave Chinner
2013-04-03 16:11:19 +11:00
committed by Ben Myers
parent 19de7351a8
commit f948dd76dd
4 changed files with 284 additions and 44 deletions
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9
fs/xfs/xfs_log_recover.c
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@ -45,6 +45,7 @@
#include "xfs_cksum.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_symlink.h"
STATIC int
xlog_find_zeroed(
@ -2002,6 +2003,14 @@ xlog_recover_do_reg_buffer(
}
bp->b_ops = &xfs_inode_buf_ops;
break;
case XFS_BLF_SYMLINK_BUF:
if (*(__be32 *)bp->b_addr != cpu_to_be32(XFS_SYMLINK_MAGIC)) {
xfs_warn(mp, "Bad symlink block magic!");
ASSERT(0);
break;
}
bp->b_ops = &xfs_symlink_buf_ops;
break;
default:
break;
}