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xfs: cleanup xfs_reflink_find_cow_mapping 

Use xfs_iext_lookup_extent to look up the extent, drop a useless check,
drop a unneeded return value and clean up the general style a little bit.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2016-11-24 11:39:49 +11:00 committed by Dave Chinner
parent 2755fc4438
commit 092d5d9d58
3 changed files with 19 additions and 32 deletions
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16
fs/xfs/xfs_aops.c
View File

@ -777,7 +777,7 @@ xfs_map_cow(
{
struct xfs_inode *ip = XFS_I(inode);
struct xfs_bmbt_irec imap;
bool is_cow = false, need_alloc = false;
bool is_cow = false;
int error;
/*
@ -795,7 +795,7 @@ xfs_map_cow(
* Else we need to check if there is a COW mapping at this offset.
*/
xfs_ilock(ip, XFS_ILOCK_SHARED);
is_cow = xfs_reflink_find_cow_mapping(ip, offset, &imap, &need_alloc);
is_cow = xfs_reflink_find_cow_mapping(ip, offset, &imap);
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (!is_cow)
@ -805,7 +805,7 @@ xfs_map_cow(
* And if the COW mapping has a delayed extent here we need to
* allocate real space for it now.
*/
if (need_alloc) {
if (isnullstartblock(imap.br_startblock)) {
error = xfs_iomap_write_allocate(ip, XFS_COW_FORK, offset,
&imap);
if (error)
@ -1312,7 +1312,6 @@ __xfs_get_blocks(
ssize_t size;
int new = 0;
bool is_cow = false;
bool need_alloc = false;
BUG_ON(create && !direct);
@ -1338,9 +1337,11 @@ __xfs_get_blocks(
end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + size);
offset_fsb = XFS_B_TO_FSBT(mp, offset);
if (create && direct && xfs_is_reflink_inode(ip))
is_cow = xfs_reflink_find_cow_mapping(ip, offset, &imap,
&need_alloc);
if (create && direct && xfs_is_reflink_inode(ip)) {
is_cow = xfs_reflink_find_cow_mapping(ip, offset, &imap);
ASSERT(!is_cow || !isnullstartblock(imap.br_startblock));
}
if (!is_cow) {
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb,
&imap, &nimaps, XFS_BMAPI_ENTIRE);
@ -1357,7 +1358,6 @@ __xfs_get_blocks(
xfs_reflink_trim_irec_to_next_cow(ip, offset_fsb,
&imap);
}
ASSERT(!need_alloc);
if (error)
goto out_unlock;

33
fs/xfs/xfs_reflink.c
View File

@ -420,44 +420,31 @@ xfs_reflink_allocate_cow_range(
}
/*
* Find the CoW reservation (and whether or not it needs block allocation)
* for a given byte offset of a file.
* Find the CoW reservation for a given byte offset of a file.
*/
bool
xfs_reflink_find_cow_mapping(
struct xfs_inode *ip,
xfs_off_t offset,
struct xfs_bmbt_irec *imap,
bool *need_alloc)
struct xfs_bmbt_irec *imap)
{
struct xfs_bmbt_irec irec;
struct xfs_ifork *ifp;
struct xfs_bmbt_rec_host *gotp;
xfs_fileoff_t bno;
struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
xfs_fileoff_t offset_fsb;
struct xfs_bmbt_irec got;
xfs_extnum_t idx;
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED));
ASSERT(xfs_is_reflink_inode(ip));
/* Find the extent in the CoW fork. */
ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
bno = XFS_B_TO_FSBT(ip->i_mount, offset);
gotp = xfs_iext_bno_to_ext(ifp, bno, &idx);
if (!gotp)
offset_fsb = XFS_B_TO_FSBT(ip->i_mount, offset);
if (!xfs_iext_lookup_extent(ip, ifp, offset_fsb, &idx, &got))
return false;
xfs_bmbt_get_all(gotp, &irec);
if (bno >= irec.br_startoff + irec.br_blockcount ||
bno < irec.br_startoff)
if (got.br_startoff > offset_fsb)
return false;
trace_xfs_reflink_find_cow_mapping(ip, offset, 1, XFS_IO_OVERWRITE,
&irec);
/* If it's still delalloc, we must allocate later. */
*imap = irec;
*need_alloc = !!(isnullstartblock(irec.br_startblock));
&got);
*imap = got;
return true;
}

2
fs/xfs/xfs_reflink.h
View File

@ -31,7 +31,7 @@ extern int xfs_reflink_reserve_cow(struct xfs_inode *ip,
extern int xfs_reflink_allocate_cow_range(struct xfs_inode *ip,
xfs_off_t offset, xfs_off_t count);
extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset,
struct xfs_bmbt_irec *imap, bool *need_alloc);
struct xfs_bmbt_irec *imap);
extern int xfs_reflink_trim_irec_to_next_cow(struct xfs_inode *ip,
xfs_fileoff_t offset_fsb, struct xfs_bmbt_irec *imap);