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authorSteven Whitehouse <swhiteho@redhat.com>2010-03-25 14:32:43 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2010-03-29 14:29:17 +0100
commit602c89d2e3e8652f94a697c9a919be739b9bcdd5 (patch)
tree791c0f4ea2b1f9028f7fdf60dbedd42fa0f8ce06 /fs/gfs2/bmap.c
parent4cb947b59c5835783fb96aad2f7d92b1e4250aff (diff)
downloadlinux-602c89d2e3e8652f94a697c9a919be739b9bcdd5.tar.bz2
GFS2: Clean up stuffed file copying
If the inode size was corrupt for stuffed files, it was possible for the copying of data to overrun the block and/or page. This patch checks for that condition so that this is no longer possible. This is also preparation for the new truncate sequence patch which requires the ability to have stuffed files with larger sizes than (disk block size - sizeof(on disk inode)) with the restriction that only the initial part of the file may be non-zero. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/bmap.c')
-rw-r--r--fs/gfs2/bmap.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 583e823307ae..0db0cd92a38d 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -72,11 +72,13 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
if (!PageUptodate(page)) {
void *kaddr = kmap(page);
+ u64 dsize = i_size_read(inode);
+
+ if (dsize > (dibh->b_size - sizeof(struct gfs2_dinode)))
+ dsize = dibh->b_size - sizeof(struct gfs2_dinode);
- memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
- ip->i_disksize);
- memset(kaddr + ip->i_disksize, 0,
- PAGE_CACHE_SIZE - ip->i_disksize);
+ memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode), dsize);
+ memset(kaddr + dsize, 0, PAGE_CACHE_SIZE - dsize);
kunmap(page);
SetPageUptodate(page);
@@ -1039,13 +1041,14 @@ static int trunc_start(struct gfs2_inode *ip, u64 size)
goto out;
if (gfs2_is_stuffed(ip)) {
- ip->i_disksize = size;
+ u64 dsize = size + sizeof(struct gfs2_inode);
ip->i_inode.i_mtime = ip->i_inode.i_ctime = CURRENT_TIME;
gfs2_trans_add_bh(ip->i_gl, dibh, 1);
gfs2_dinode_out(ip, dibh->b_data);
- gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + size);
+ if (dsize > dibh->b_size)
+ dsize = dibh->b_size;
+ gfs2_buffer_clear_tail(dibh, dsize);
error = 1;
-
} else {
if (size & (u64)(sdp->sd_sb.sb_bsize - 1))
error = gfs2_block_truncate_page(ip->i_inode.i_mapping);