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xfs: initialize iomap->flags in xfs_bmbt_to_iomap

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Currently we don't overwrite the flags field in the iomap in
xfs_bmbt_to_iomap.  This works fine with 0-initialized iomaps on stack,
but is harmful once we want to be able to reuse an iomap in the
writeback code.  Replace the shared parameter with a set of initial
flags an thus ensures the flags field is always reinitialized.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig 2019-10-17 13:12:02 -07:00 committed by Darrick J. Wong
parent 7684e2c438
commit 2492a606b3
3 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
fs/xfs/xfs_iomap.c
View File

@ -54,7 +54,7 @@ xfs_bmbt_to_iomap(
struct xfs_inode *ip,
struct iomap *iomap,
struct xfs_bmbt_irec *imap,
bool shared)
u16 flags)
{
struct xfs_mount *mp = ip->i_mount;
@ -79,12 +79,11 @@ xfs_bmbt_to_iomap(
iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
iomap->dax_dev = xfs_find_daxdev_for_inode(VFS_I(ip));
iomap->flags = flags;
if (xfs_ipincount(ip) &&
(ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP))
iomap->flags |= IOMAP_F_DIRTY;
if (shared)
iomap->flags |= IOMAP_F_SHARED;
return 0;
}
@ -540,6 +539,7 @@ xfs_file_iomap_begin_delay(
struct xfs_iext_cursor icur, ccur;
xfs_fsblock_t prealloc_blocks = 0;
bool eof = false, cow_eof = false, shared = false;
u16 iomap_flags = 0;
int whichfork = XFS_DATA_FORK;
int error = 0;
@ -707,7 +707,7 @@ retry:
* Flag newly allocated delalloc blocks with IOMAP_F_NEW so we punch
* them out if the write happens to fail.
*/
iomap->flags |= IOMAP_F_NEW;
iomap_flags |= IOMAP_F_NEW;
trace_xfs_iomap_alloc(ip, offset, count, whichfork,
whichfork == XFS_DATA_FORK ? &imap : &cmap);
done:
@ -715,14 +715,17 @@ done:
if (imap.br_startoff > offset_fsb) {
xfs_trim_extent(&cmap, offset_fsb,
imap.br_startoff - offset_fsb);
error = xfs_bmbt_to_iomap(ip, iomap, &cmap, true);
error = xfs_bmbt_to_iomap(ip, iomap, &cmap,
IOMAP_F_SHARED);
goto out_unlock;
}
/* ensure we only report blocks we have a reservation for */
xfs_trim_extent(&imap, cmap.br_startoff, cmap.br_blockcount);
shared = true;
}
error = xfs_bmbt_to_iomap(ip, iomap, &imap, shared);
if (shared)
iomap_flags |= IOMAP_F_SHARED;
error = xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags);
out_unlock:
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
@ -930,6 +933,7 @@ xfs_file_iomap_begin(
xfs_fileoff_t offset_fsb, end_fsb;
int nimaps = 1, error = 0;
bool shared = false;
u16 iomap_flags = 0;
unsigned lockmode;
if (XFS_FORCED_SHUTDOWN(mp))
@ -1045,7 +1049,7 @@ xfs_file_iomap_begin(
if (error)
return error;
iomap->flags |= IOMAP_F_NEW;
iomap_flags |= IOMAP_F_NEW;
trace_xfs_iomap_alloc(ip, offset, length, XFS_DATA_FORK, &imap);
out_finish:
@ -1055,8 +1059,10 @@ out_finish:
* there is no other metadata changes pending or have been made here.
*/
if ((flags & IOMAP_WRITE) && offset + length > i_size_read(inode))
iomap->flags |= IOMAP_F_DIRTY;
return xfs_bmbt_to_iomap(ip, iomap, &imap, shared);
iomap_flags |= IOMAP_F_DIRTY;
if (shared)
iomap_flags |= IOMAP_F_SHARED;
return xfs_bmbt_to_iomap(ip, iomap, &imap, iomap_flags);
out_found:
ASSERT(nimaps);
@ -1200,7 +1206,7 @@ xfs_seek_iomap_begin(
if (data_fsb < cow_fsb + cmap.br_blockcount)
end_fsb = min(end_fsb, data_fsb);
xfs_trim_extent(&cmap, offset_fsb, end_fsb);
error = xfs_bmbt_to_iomap(ip, iomap, &cmap, true);
error = xfs_bmbt_to_iomap(ip, iomap, &cmap, IOMAP_F_SHARED);
/*
* This is a COW extent, so we must probe the page cache
* because there could be dirty page cache being backed
@ -1222,7 +1228,7 @@ xfs_seek_iomap_begin(
imap.br_state = XFS_EXT_NORM;
done:
xfs_trim_extent(&imap, offset_fsb, end_fsb);
error = xfs_bmbt_to_iomap(ip, iomap, &imap, false);
error = xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
out_unlock:
xfs_iunlock(ip, lockmode);
return error;
@ -1268,7 +1274,7 @@ out_unlock:
if (error)
return error;
ASSERT(nimaps);
return xfs_bmbt_to_iomap(ip, iomap, &imap, false);
return xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
}
const struct iomap_ops xfs_xattr_iomap_ops = {

2
fs/xfs/xfs_iomap.h
View File

@ -16,7 +16,7 @@ int xfs_iomap_write_direct(struct xfs_inode *, xfs_off_t, size_t,
int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t, bool);
int xfs_bmbt_to_iomap(struct xfs_inode *, struct iomap *,
struct xfs_bmbt_irec *, bool shared);
struct xfs_bmbt_irec *, u16);
xfs_extlen_t xfs_eof_alignment(struct xfs_inode *ip, xfs_extlen_t extsize);
static inline xfs_filblks_t

2
fs/xfs/xfs_pnfs.c
View File

@ -178,7 +178,7 @@ xfs_fs_map_blocks(
}
xfs_iunlock(ip, XFS_IOLOCK_EXCL);
error = xfs_bmbt_to_iomap(ip, iomap, &imap, false);
error = xfs_bmbt_to_iomap(ip, iomap, &imap, 0);
*device_generation = mp->m_generation;
return error;
out_unlock: