Commit 2741b672 authored by Andreas Gruenbacher's avatar Andreas Gruenbacher

gfs2: Fix rounding error in gfs2_iomap_page_prepare

The pos and len arguments to the iomap page_prepare callback are not
block aligned, so we need to take that into account when computing the
number of blocks.

Fixes: d0a22a4b ("gfs2: Fix iomap write page reclaim deadlock")
Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
parent dc8ca9cc
......@@ -994,9 +994,12 @@ static void gfs2_write_unlock(struct inode *inode)
static int gfs2_iomap_page_prepare(struct inode *inode, loff_t pos,
unsigned len, struct iomap *iomap)
{
unsigned int blockmask = i_blocksize(inode) - 1;
struct gfs2_sbd *sdp = GFS2_SB(inode);
unsigned int blocks;
return gfs2_trans_begin(sdp, RES_DINODE + (len >> inode->i_blkbits), 0);
blocks = ((pos & blockmask) + len + blockmask) >> inode->i_blkbits;
return gfs2_trans_begin(sdp, RES_DINODE + blocks, 0);
}
static void gfs2_iomap_page_done(struct inode *inode, loff_t pos,
......
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