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: d0a22a4b03
("gfs2: Fix iomap write page reclaim deadlock")
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
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@ -994,9 +994,12 @@ static void gfs2_write_unlock(struct inode *inode)
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static int gfs2_iomap_page_prepare(struct inode *inode, loff_t pos,
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unsigned len, struct iomap *iomap)
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{
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unsigned int blockmask = i_blocksize(inode) - 1;
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struct gfs2_sbd *sdp = GFS2_SB(inode);
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unsigned int blocks;
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return gfs2_trans_begin(sdp, RES_DINODE + (len >> inode->i_blkbits), 0);
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blocks = ((pos & blockmask) + len + blockmask) >> inode->i_blkbits;
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return gfs2_trans_begin(sdp, RES_DINODE + blocks, 0);
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}
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static void gfs2_iomap_page_done(struct inode *inode, loff_t pos,
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