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Date: Fri, 7 Jul 2017 23:28:00 +0200
From: Andreas Gruenbacher <agruenba@...hat.com>
To: Christoph Hellwig <hch@....de>
Cc: Andreas Gruenbacher <agruenba@...hat.com>, Jan Kara <jack@...e.cz>,
linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
linux-ext4@...r.kernel.org
Subject: [PATCH v4 2/3] iomap: Switch from blkno to physical offset
Replace iomap->blkno, the sector number in 512-byte units, into
iomap->pyhsical, the physical offset in bytes. For invalid physical
offsets, use the special value IOMAP_NULL_PHYSICAL instead of
IOMAP_NULL_BLOCK. This allows to use iomap for mappings which are not
block aligned, line inline data on ext4.
Add a new IOMAP_F_INLINE flag to indicate that a mapping is in an area
that contains data as well as metadata. In iomap_fiemap, map that flag
to FIEMAP_EXTENT_DATA_INLINE.
Signed-off-by: Andreas Gruenbacher <agruenba@...hat.com>
---
fs/buffer.c | 2 +-
fs/dax.c | 2 +-
fs/ext2/inode.c | 4 ++--
fs/ext4/inode.c | 4 ++--
fs/iomap.c | 14 ++++++++------
fs/nfsd/blocklayout.c | 4 ++--
fs/xfs/xfs_iomap.c | 6 +++---
include/linux/iomap.h | 5 +++--
8 files changed, 22 insertions(+), 19 deletions(-)
diff --git a/fs/buffer.c b/fs/buffer.c
index b3674eb..e16f647 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1982,7 +1982,7 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
case IOMAP_MAPPED:
if (offset >= i_size_read(inode))
set_buffer_new(bh);
- bh->b_blocknr = (iomap->blkno >> (inode->i_blkbits - 9)) +
+ bh->b_blocknr = (iomap->physical >> inode->i_blkbits) +
((offset - iomap->offset) >> inode->i_blkbits);
set_buffer_mapped(bh);
break;
diff --git a/fs/dax.c b/fs/dax.c
index 9187f3b..926caa5 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -985,7 +985,7 @@ EXPORT_SYMBOL_GPL(__dax_zero_page_range);
static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos)
{
- return iomap->blkno + (((pos & PAGE_MASK) - iomap->offset) >> 9);
+ return (iomap->physical + (pos & PAGE_MASK) - iomap->offset) >> 9;
}
static loff_t
diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index 2dcbd56..8e9f109 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -823,11 +823,11 @@ static int ext2_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
if (ret == 0) {
iomap->type = IOMAP_HOLE;
- iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->physical = IOMAP_NULL_PHYSICAL;
iomap->length = 1 << blkbits;
} else {
iomap->type = IOMAP_MAPPED;
- iomap->blkno = (sector_t)bno << (blkbits - 9);
+ iomap->physical = (u64)bno << blkbits;
iomap->length = (u64)ret << blkbits;
iomap->flags |= IOMAP_F_MERGED;
}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 56a3b04..82f3f7d 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3454,7 +3454,7 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
if (ret == 0) {
iomap->type = IOMAP_HOLE;
- iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->physical = IOMAP_NULL_PHYSICAL;
iomap->length = (u64)map.m_len << blkbits;
} else {
if (delalloc) {
@@ -3467,7 +3467,7 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
WARN_ON_ONCE(1);
return -EIO;
}
- iomap->blkno = (sector_t)map.m_pblk << (blkbits - 9);
+ iomap->physical = (u64)map.m_pblk << blkbits;
iomap->length = (u64)map.m_len << blkbits;
}
diff --git a/fs/iomap.c b/fs/iomap.c
index 432eed8..fca7b4c 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -350,8 +350,8 @@ static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
struct iomap *iomap)
{
- sector_t sector = iomap->blkno +
- (((pos & ~(PAGE_SIZE - 1)) - iomap->offset) >> 9);
+ sector_t sector = (iomap->physical +
+ (pos & ~(PAGE_SIZE - 1)) - iomap->offset) >> 9;
return __dax_zero_page_range(iomap->bdev, iomap->dax_dev, sector,
offset, bytes);
@@ -510,11 +510,13 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
flags |= FIEMAP_EXTENT_MERGED;
if (iomap->flags & IOMAP_F_SHARED)
flags |= FIEMAP_EXTENT_SHARED;
+ if (iomap->flags & IOMAP_F_INLINE)
+ flags |= FIEMAP_EXTENT_DATA_INLINE;
return fiemap_fill_next_extent(fi, iomap->offset,
- iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0,
+ iomap->physical != IOMAP_NULL_PHYSICAL ?
+ iomap->physical : 0,
iomap->length, flags);
-
}
static loff_t
@@ -807,7 +809,7 @@ iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
bio = bio_alloc(GFP_KERNEL, 1);
bio->bi_bdev = iomap->bdev;
bio->bi_iter.bi_sector =
- iomap->blkno + ((pos - iomap->offset) >> 9);
+ (iomap->physical + pos - iomap->offset) >> 9;
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
@@ -886,7 +888,7 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
bio = bio_alloc(GFP_KERNEL, nr_pages);
bio->bi_bdev = iomap->bdev;
bio->bi_iter.bi_sector =
- iomap->blkno + ((pos - iomap->offset) >> 9);
+ (iomap->physical + pos - iomap->offset) >> 9;
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
index fb5213a..6027b45 100644
--- a/fs/nfsd/blocklayout.c
+++ b/fs/nfsd/blocklayout.c
@@ -65,7 +65,7 @@ nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
bex->es = PNFS_BLOCK_READ_DATA;
else
bex->es = PNFS_BLOCK_READWRITE_DATA;
- bex->soff = (iomap.blkno << 9);
+ bex->soff = iomap.physical;
break;
case IOMAP_UNWRITTEN:
if (seg->iomode & IOMODE_RW) {
@@ -78,7 +78,7 @@ nfsd4_block_proc_layoutget(struct inode *inode, const struct svc_fh *fhp,
}
bex->es = PNFS_BLOCK_INVALID_DATA;
- bex->soff = (iomap.blkno << 9);
+ bex->soff = iomap.physical;
break;
}
/*FALLTHRU*/
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 94e5bdf..45b2561 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -54,13 +54,13 @@ xfs_bmbt_to_iomap(
struct xfs_mount *mp = ip->i_mount;
if (imap->br_startblock == HOLESTARTBLOCK) {
- iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->physical = IOMAP_NULL_PHYSICAL;
iomap->type = IOMAP_HOLE;
} else if (imap->br_startblock == DELAYSTARTBLOCK) {
- iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->physical = IOMAP_NULL_PHYSICAL;
iomap->type = IOMAP_DELALLOC;
} else {
- iomap->blkno = xfs_fsb_to_db(ip, imap->br_startblock);
+ iomap->physical = xfs_fsb_to_db(ip, imap->br_startblock) << 9;
if (imap->br_state == XFS_EXT_UNWRITTEN)
iomap->type = IOMAP_UNWRITTEN;
else
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 8a03f5d..ad49625 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -28,14 +28,15 @@ struct vm_fault;
*/
#define IOMAP_F_MERGED 0x10 /* contains multiple blocks/extents */
#define IOMAP_F_SHARED 0x20 /* block shared with another file */
+#define IOMAP_F_INLINE 0x40 /* data mixed with metadata */
/*
* Magic value for blkno:
*/
-#define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
+#define IOMAP_NULL_PHYSICAL -1LL /* physical offset is not valid */
struct iomap {
- sector_t blkno; /* 1st sector of mapping, 512b units */
+ u64 physical; /* physical offset of mapping, bytes */
loff_t offset; /* file offset of mapping, bytes */
u64 length; /* length of mapping, bytes */
u16 type; /* type of mapping */
--
2.7.5
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