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gfs2: Further iomap cleanups

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In gfs2_iomap_alloc, set the type of newly allocated extents to
IOMAP_MAPPED so that iomap_to_bh will set the bh states correctly:
otherwise, the bhs would not be marked as mapped, confusing
__mpage_writepage.  This means that we need to check for the IOMAP_F_NEW
flag in fallocate_chunk now.

Further clean up gfs2_iomap_get and implement gfs2_stuffed_iomap here
directly.  For reads beyond the end of the file, return holes instead of
failing with -ENOENT so that we can get rid of that special case in
gfs2_block_map.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2018-06-24 10:43:49 +01:00
parent e184fde6f3
commit d505a96a3b
2 changed files with 43 additions and 33 deletions
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74
fs/gfs2/bmap.c
View File

@ -750,6 +750,7 @@ static int gfs2_iomap_alloc(struct inode *inode, struct iomap *iomap,
}
} while (iomap->addr == IOMAP_NULL_ADDR);
iomap->type = IOMAP_MAPPED;
iomap->length = (u64)dblks << inode->i_blkbits;
ip->i_height = mp->mp_fheight;
gfs2_add_inode_blocks(&ip->i_inode, alloced);
@ -759,17 +760,6 @@ out:
return ret;
}
static void gfs2_stuffed_iomap(struct inode *inode, struct iomap *iomap)
{
struct gfs2_inode *ip = GFS2_I(inode);
iomap->addr = (ip->i_no_addr << inode->i_blkbits) +
sizeof(struct gfs2_dinode);
iomap->offset = 0;
iomap->length = i_size_read(inode);
iomap->type = IOMAP_INLINE;
}
#define IOMAP_F_GFS2_BOUNDARY IOMAP_F_PRIVATE
/**
@ -789,37 +779,61 @@ static int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
loff_t size = i_size_read(inode);
__be64 *ptr;
sector_t lblock;
sector_t lblock_stop;
int ret;
int eob;
u64 len;
struct buffer_head *bh;
struct buffer_head *dibh = NULL, *bh;
u8 height;
if (!length)
return -EINVAL;
down_read(&ip->i_rw_mutex);
ret = gfs2_meta_inode_buffer(ip, &dibh);
if (ret)
goto unlock;
if (gfs2_is_stuffed(ip)) {
if (flags & IOMAP_REPORT) {
if (pos >= i_size_read(inode))
return -ENOENT;
gfs2_stuffed_iomap(inode, iomap);
return 0;
if (flags & IOMAP_WRITE) {
loff_t max_size = gfs2_max_stuffed_size(ip);
if (pos + length > max_size)
goto unstuff;
iomap->length = max_size;
} else {
if (pos >= size) {
if (flags & IOMAP_REPORT) {
ret = -ENOENT;
goto unlock;
} else {
/* report a hole */
iomap->offset = pos;
iomap->length = length;
goto do_alloc;
}
}
iomap->length = size;
}
BUG_ON(!(flags & IOMAP_WRITE));
iomap->addr = (ip->i_no_addr << inode->i_blkbits) +
sizeof(struct gfs2_dinode);
iomap->type = IOMAP_INLINE;
goto out;
}
unstuff:
lblock = pos >> inode->i_blkbits;
iomap->offset = lblock << inode->i_blkbits;
lblock_stop = (pos + length - 1) >> inode->i_blkbits;
len = lblock_stop - lblock + 1;
iomap->length = len << inode->i_blkbits;
down_read(&ip->i_rw_mutex);
ret = gfs2_meta_inode_buffer(ip, &mp->mp_bh[0]);
if (ret)
goto unlock;
get_bh(dibh);
mp->mp_bh[0] = dibh;
height = ip->i_height;
while ((lblock + 1) * sdp->sd_sb.sb_bsize > sdp->sd_heightsize[height])
@ -853,21 +867,23 @@ out:
iomap->bdev = inode->i_sb->s_bdev;
unlock:
up_read(&ip->i_rw_mutex);
if (dibh)
brelse(dibh);
return ret;
do_alloc:
iomap->addr = IOMAP_NULL_ADDR;
iomap->length = len << inode->i_blkbits;
iomap->type = IOMAP_HOLE;
iomap->flags = 0;
if (flags & IOMAP_REPORT) {
loff_t size = i_size_read(inode);
if (pos >= size)
ret = -ENOENT;
else if (height == ip->i_height)
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
else
iomap->length = size - pos;
} else if (!(flags & IOMAP_WRITE)) {
if (pos < size && height == ip->i_height)
ret = gfs2_hole_size(inode, lblock, len, mp, iomap);
}
goto out;
}
@ -941,12 +957,6 @@ int gfs2_block_map(struct inode *inode, sector_t lblock,
} else {
ret = gfs2_iomap_get(inode, pos, length, 0, &iomap, &mp);
release_metapath(&mp);
/* Return unmapped buffer beyond the end of file. */
if (ret == -ENOENT) {
ret = 0;
goto out;
}
}
if (ret)
goto out;

2
fs/gfs2/file.c
View File

@ -754,7 +754,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
if (error)
goto out;
offset = iomap.offset + iomap.length;
if (iomap.type != IOMAP_HOLE)
if (!(iomap.flags & IOMAP_F_NEW))
continue;
error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
iomap.length >> inode->i_blkbits,