xfs: refactor swapext code
Refactor the swapext function to pull out the fork swapping piece into a separate function. In the next patch we'll add in the bit we need to make it work with rmap filesystems. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong
parent
e06259aa08
commit
39aff5fdb9
@ -1649,6 +1649,142 @@ xfs_swap_extent_flush(
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Swap the extents of two files by swapping data forks. */
|
||||
STATIC int
|
||||
xfs_swap_extent_forks(
|
||||
struct xfs_trans *tp,
|
||||
struct xfs_inode *ip,
|
||||
struct xfs_inode *tip,
|
||||
int *src_log_flags,
|
||||
int *target_log_flags)
|
||||
{
|
||||
struct xfs_ifork tempifp, *ifp, *tifp;
|
||||
int aforkblks = 0;
|
||||
int taforkblks = 0;
|
||||
__uint64_t tmp;
|
||||
int error;
|
||||
|
||||
/*
|
||||
* Count the number of extended attribute blocks
|
||||
*/
|
||||
if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
|
||||
(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
|
||||
error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK,
|
||||
&aforkblks);
|
||||
if (error)
|
||||
return error;
|
||||
}
|
||||
if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
|
||||
(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
|
||||
error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
|
||||
&taforkblks);
|
||||
if (error)
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Before we've swapped the forks, lets set the owners of the forks
|
||||
* appropriately. We have to do this as we are demand paging the btree
|
||||
* buffers, and so the validation done on read will expect the owner
|
||||
* field to be correctly set. Once we change the owners, we can swap the
|
||||
* inode forks.
|
||||
*/
|
||||
if (ip->i_d.di_version == 3 &&
|
||||
ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
||||
(*target_log_flags) |= XFS_ILOG_DOWNER;
|
||||
error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK,
|
||||
tip->i_ino, NULL);
|
||||
if (error)
|
||||
return error;
|
||||
}
|
||||
|
||||
if (tip->i_d.di_version == 3 &&
|
||||
tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
||||
(*src_log_flags) |= XFS_ILOG_DOWNER;
|
||||
error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK,
|
||||
ip->i_ino, NULL);
|
||||
if (error)
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Swap the data forks of the inodes
|
||||
*/
|
||||
ifp = &ip->i_df;
|
||||
tifp = &tip->i_df;
|
||||
tempifp = *ifp; /* struct copy */
|
||||
*ifp = *tifp; /* struct copy */
|
||||
*tifp = tempifp; /* struct copy */
|
||||
|
||||
/*
|
||||
* Fix the on-disk inode values
|
||||
*/
|
||||
tmp = (__uint64_t)ip->i_d.di_nblocks;
|
||||
ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
|
||||
tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
|
||||
|
||||
tmp = (__uint64_t) ip->i_d.di_nextents;
|
||||
ip->i_d.di_nextents = tip->i_d.di_nextents;
|
||||
tip->i_d.di_nextents = tmp;
|
||||
|
||||
tmp = (__uint64_t) ip->i_d.di_format;
|
||||
ip->i_d.di_format = tip->i_d.di_format;
|
||||
tip->i_d.di_format = tmp;
|
||||
|
||||
/*
|
||||
* The extents in the source inode could still contain speculative
|
||||
* preallocation beyond EOF (e.g. the file is open but not modified
|
||||
* while defrag is in progress). In that case, we need to copy over the
|
||||
* number of delalloc blocks the data fork in the source inode is
|
||||
* tracking beyond EOF so that when the fork is truncated away when the
|
||||
* temporary inode is unlinked we don't underrun the i_delayed_blks
|
||||
* counter on that inode.
|
||||
*/
|
||||
ASSERT(tip->i_delayed_blks == 0);
|
||||
tip->i_delayed_blks = ip->i_delayed_blks;
|
||||
ip->i_delayed_blks = 0;
|
||||
|
||||
switch (ip->i_d.di_format) {
|
||||
case XFS_DINODE_FMT_EXTENTS:
|
||||
/* If the extents fit in the inode, fix the
|
||||
* pointer. Otherwise it's already NULL or
|
||||
* pointing to the extent.
|
||||
*/
|
||||
if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
|
||||
ifp->if_u1.if_extents =
|
||||
ifp->if_u2.if_inline_ext;
|
||||
}
|
||||
(*src_log_flags) |= XFS_ILOG_DEXT;
|
||||
break;
|
||||
case XFS_DINODE_FMT_BTREE:
|
||||
ASSERT(ip->i_d.di_version < 3 ||
|
||||
(*src_log_flags & XFS_ILOG_DOWNER));
|
||||
(*src_log_flags) |= XFS_ILOG_DBROOT;
|
||||
break;
|
||||
}
|
||||
|
||||
switch (tip->i_d.di_format) {
|
||||
case XFS_DINODE_FMT_EXTENTS:
|
||||
/* If the extents fit in the inode, fix the
|
||||
* pointer. Otherwise it's already NULL or
|
||||
* pointing to the extent.
|
||||
*/
|
||||
if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
|
||||
tifp->if_u1.if_extents =
|
||||
tifp->if_u2.if_inline_ext;
|
||||
}
|
||||
(*target_log_flags) |= XFS_ILOG_DEXT;
|
||||
break;
|
||||
case XFS_DINODE_FMT_BTREE:
|
||||
(*target_log_flags) |= XFS_ILOG_DBROOT;
|
||||
ASSERT(tip->i_d.di_version < 3 ||
|
||||
(*target_log_flags & XFS_ILOG_DOWNER));
|
||||
break;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int
|
||||
xfs_swap_extents(
|
||||
struct xfs_inode *ip, /* target inode */
|
||||
@ -1658,26 +1794,12 @@ xfs_swap_extents(
|
||||
struct xfs_mount *mp = ip->i_mount;
|
||||
struct xfs_trans *tp;
|
||||
struct xfs_bstat *sbp = &sxp->sx_stat;
|
||||
struct xfs_ifork *tempifp, *ifp, *tifp;
|
||||
int src_log_flags, target_log_flags;
|
||||
int error = 0;
|
||||
int aforkblks = 0;
|
||||
int taforkblks = 0;
|
||||
__uint64_t tmp;
|
||||
int lock_flags;
|
||||
struct xfs_ifork *cowfp;
|
||||
__uint64_t f;
|
||||
|
||||
/* XXX: we can't do this with rmap, will fix later */
|
||||
if (xfs_sb_version_hasrmapbt(&mp->m_sb))
|
||||
return -EOPNOTSUPP;
|
||||
|
||||
tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
|
||||
if (!tempifp) {
|
||||
error = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Lock the inodes against other IO, page faults and truncate to
|
||||
* begin with. Then we can ensure the inodes are flushed and have no
|
||||
@ -1717,8 +1839,8 @@ xfs_swap_extents(
|
||||
*/
|
||||
xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
|
||||
lock_flags |= XFS_ILOCK_EXCL;
|
||||
xfs_trans_ijoin(tp, ip, lock_flags);
|
||||
xfs_trans_ijoin(tp, tip, lock_flags);
|
||||
xfs_trans_ijoin(tp, ip, 0);
|
||||
xfs_trans_ijoin(tp, tip, 0);
|
||||
|
||||
|
||||
/* Verify all data are being swapped */
|
||||
@ -1755,30 +1877,8 @@ xfs_swap_extents(
|
||||
error = -EBUSY;
|
||||
goto out_trans_cancel;
|
||||
}
|
||||
/*
|
||||
* Count the number of extended attribute blocks
|
||||
*/
|
||||
if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
|
||||
(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
|
||||
error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
|
||||
if (error)
|
||||
goto out_trans_cancel;
|
||||
}
|
||||
if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
|
||||
(tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
|
||||
error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
|
||||
&taforkblks);
|
||||
if (error)
|
||||
goto out_trans_cancel;
|
||||
}
|
||||
|
||||
/*
|
||||
* Before we've swapped the forks, lets set the owners of the forks
|
||||
* appropriately. We have to do this as we are demand paging the btree
|
||||
* buffers, and so the validation done on read will expect the owner
|
||||
* field to be correctly set. Once we change the owners, we can swap the
|
||||
* inode forks.
|
||||
*
|
||||
* Note the trickiness in setting the log flags - we set the owner log
|
||||
* flag on the opposite inode (i.e. the inode we are setting the new
|
||||
* owner to be) because once we swap the forks and log that, log
|
||||
@ -1787,98 +1887,11 @@ xfs_swap_extents(
|
||||
*/
|
||||
src_log_flags = XFS_ILOG_CORE;
|
||||
target_log_flags = XFS_ILOG_CORE;
|
||||
if (ip->i_d.di_version == 3 &&
|
||||
ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
||||
target_log_flags |= XFS_ILOG_DOWNER;
|
||||
error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK,
|
||||
tip->i_ino, NULL);
|
||||
if (error)
|
||||
goto out_trans_cancel;
|
||||
}
|
||||
|
||||
if (tip->i_d.di_version == 3 &&
|
||||
tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
|
||||
src_log_flags |= XFS_ILOG_DOWNER;
|
||||
error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK,
|
||||
ip->i_ino, NULL);
|
||||
if (error)
|
||||
goto out_trans_cancel;
|
||||
}
|
||||
|
||||
/*
|
||||
* Swap the data forks of the inodes
|
||||
*/
|
||||
ifp = &ip->i_df;
|
||||
tifp = &tip->i_df;
|
||||
*tempifp = *ifp; /* struct copy */
|
||||
*ifp = *tifp; /* struct copy */
|
||||
*tifp = *tempifp; /* struct copy */
|
||||
|
||||
/*
|
||||
* Fix the on-disk inode values
|
||||
*/
|
||||
tmp = (__uint64_t)ip->i_d.di_nblocks;
|
||||
ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
|
||||
tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
|
||||
|
||||
tmp = (__uint64_t) ip->i_d.di_nextents;
|
||||
ip->i_d.di_nextents = tip->i_d.di_nextents;
|
||||
tip->i_d.di_nextents = tmp;
|
||||
|
||||
tmp = (__uint64_t) ip->i_d.di_format;
|
||||
ip->i_d.di_format = tip->i_d.di_format;
|
||||
tip->i_d.di_format = tmp;
|
||||
|
||||
/*
|
||||
* The extents in the source inode could still contain speculative
|
||||
* preallocation beyond EOF (e.g. the file is open but not modified
|
||||
* while defrag is in progress). In that case, we need to copy over the
|
||||
* number of delalloc blocks the data fork in the source inode is
|
||||
* tracking beyond EOF so that when the fork is truncated away when the
|
||||
* temporary inode is unlinked we don't underrun the i_delayed_blks
|
||||
* counter on that inode.
|
||||
*/
|
||||
ASSERT(tip->i_delayed_blks == 0);
|
||||
tip->i_delayed_blks = ip->i_delayed_blks;
|
||||
ip->i_delayed_blks = 0;
|
||||
|
||||
switch (ip->i_d.di_format) {
|
||||
case XFS_DINODE_FMT_EXTENTS:
|
||||
/* If the extents fit in the inode, fix the
|
||||
* pointer. Otherwise it's already NULL or
|
||||
* pointing to the extent.
|
||||
*/
|
||||
if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
|
||||
ifp->if_u1.if_extents =
|
||||
ifp->if_u2.if_inline_ext;
|
||||
}
|
||||
src_log_flags |= XFS_ILOG_DEXT;
|
||||
break;
|
||||
case XFS_DINODE_FMT_BTREE:
|
||||
ASSERT(ip->i_d.di_version < 3 ||
|
||||
(src_log_flags & XFS_ILOG_DOWNER));
|
||||
src_log_flags |= XFS_ILOG_DBROOT;
|
||||
break;
|
||||
}
|
||||
|
||||
switch (tip->i_d.di_format) {
|
||||
case XFS_DINODE_FMT_EXTENTS:
|
||||
/* If the extents fit in the inode, fix the
|
||||
* pointer. Otherwise it's already NULL or
|
||||
* pointing to the extent.
|
||||
*/
|
||||
if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
|
||||
tifp->if_u1.if_extents =
|
||||
tifp->if_u2.if_inline_ext;
|
||||
}
|
||||
target_log_flags |= XFS_ILOG_DEXT;
|
||||
break;
|
||||
case XFS_DINODE_FMT_BTREE:
|
||||
target_log_flags |= XFS_ILOG_DBROOT;
|
||||
ASSERT(tip->i_d.di_version < 3 ||
|
||||
(target_log_flags & XFS_ILOG_DOWNER));
|
||||
break;
|
||||
}
|
||||
error = xfs_swap_extent_forks(tp, ip, tip, &src_log_flags,
|
||||
&target_log_flags);
|
||||
if (error)
|
||||
goto out_trans_cancel;
|
||||
|
||||
/* Do we have to swap reflink flags? */
|
||||
if ((ip->i_d.di_flags2 & XFS_DIFLAG2_REFLINK) ^
|
||||
@ -1909,16 +1922,16 @@ xfs_swap_extents(
|
||||
|
||||
trace_xfs_swap_extent_after(ip, 0);
|
||||
trace_xfs_swap_extent_after(tip, 1);
|
||||
out:
|
||||
kmem_free(tempifp);
|
||||
|
||||
xfs_iunlock(ip, lock_flags);
|
||||
xfs_iunlock(tip, lock_flags);
|
||||
return error;
|
||||
|
||||
out_trans_cancel:
|
||||
xfs_trans_cancel(tp);
|
||||
|
||||
out_unlock:
|
||||
xfs_iunlock(ip, lock_flags);
|
||||
xfs_iunlock(tip, lock_flags);
|
||||
goto out;
|
||||
|
||||
out_trans_cancel:
|
||||
xfs_trans_cancel(tp);
|
||||
goto out;
|
||||
return error;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user