From 946217ba28637d7a08e03e93ef40586ce621f557 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Tue, 30 Apr 2013 21:39:35 +1000 Subject: [PATCH] xfs: Remote attr validation fixes and optimisations - optimise the calcuation for the number of blocks in a remote xattr. - check attribute length against MAX_XATTR_SIZE, not MAXPATHLEN - whitespace fixes Signed-off-by: Dave Chinner Reviewed-by: Ben Myers Signed-off-by: Ben Myers --- fs/xfs/xfs_attr_remote.c | 19 +++++-------------- 1 file changed, 5 insertions(+), 14 deletions(-) diff --git a/fs/xfs/xfs_attr_remote.c b/fs/xfs/xfs_attr_remote.c index 53da46b46c2f..dee84466dcc9 100644 --- a/fs/xfs/xfs_attr_remote.c +++ b/fs/xfs/xfs_attr_remote.c @@ -52,15 +52,9 @@ xfs_attr3_rmt_blocks( struct xfs_mount *mp, int attrlen) { - int fsblocks = 0; - int len = attrlen; - - do { - fsblocks++; - len -= XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize); - } while (len > 0); - - return fsblocks; + int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, + mp->m_sb.sb_blocksize); + return (attrlen + buflen - 1) / buflen; } static bool @@ -79,7 +73,7 @@ xfs_attr3_rmt_verify( if (bp->b_bn != be64_to_cpu(rmt->rm_blkno)) return false; if (be32_to_cpu(rmt->rm_offset) + - be32_to_cpu(rmt->rm_bytes) >= MAXPATHLEN) + be32_to_cpu(rmt->rm_bytes) >= XATTR_SIZE_MAX) return false; if (rmt->rm_owner == 0) return false; @@ -183,7 +177,6 @@ xfs_attr3_rmt_hdr_ok( /* ok */ return true; - } /* @@ -367,7 +360,6 @@ xfs_attr_rmtval_set( * spill for another block every 9 headers we require in this * loop. */ - if (crcs && blkcnt == 0) { int total_len; @@ -422,9 +414,8 @@ xfs_attr_rmtval_set( byte_cnt = BBTOB(bp->b_length); byte_cnt = XFS_ATTR3_RMT_BUF_SPACE(mp, byte_cnt); - if (valuelen < byte_cnt) { + if (valuelen < byte_cnt) byte_cnt = valuelen; - } buf = bp->b_addr; buf += xfs_attr3_rmt_hdr_set(mp, dp->i_ino, offset, -- 2.20.1