[RFC v2 PATCH 02/10] xfs: replace xfs_mod_fdblocks() bool param with flags

Brian Foster
2016-04-12T16:42:57Z

xfs_mod_fdblocks() takes a boolean parameter to indicate whether the
requested allocation can dip into the XFS reserve block pool, if
necessary, to satisfy the allocation.

This function will also require caller control over block device
reservation. In preparation, convert the bool parameter to a flags
parameter and update all callers to use the appropriate reserved pool
flag as appropriate.

Signed-off-by: Brian Foster <bfoster@redhat.com>
---
fs/xfs/libxfs/xfs_bmap.c | 17 ++++++++---------
fs/xfs/xfs_mount.c | 3 ++-
fs/xfs/xfs_mount.h | 4 +++-
fs/xfs/xfs_trans.c | 21 ++++++++++++++-------
4 files changed, 27 insertions(+), 18 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index ce41d7f..1a805b0 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -2186,7 +2186,7 @@ xfs_bmap_add_extent_delay_real(
(bma->cur ? bma->cur->bc_private.b.allocated : 0));
if (diff > 0) {
error = xfs_mod_fdblocks(bma->ip->i_mount,
- -((int64_t)diff), false);
+ -((int64_t)diff), 0);
ASSERT(!error);
if (error)
goto done;
@@ -2238,7 +2238,7 @@ xfs_bmap_add_extent_delay_real(
ASSERT(temp <= da_old);
if (temp < da_old)
xfs_mod_fdblocks(bma->ip->i_mount,
- (int64_t)(da_old - temp), false);
+ (int64_t)(da_old - temp), 0);
}

/* clear out the allocated field, done with it now in any case. */
@@ -2916,8 +2916,7 @@ xfs_bmap_add_extent_hole_delay(
}
if (oldlen != newlen) {
ASSERT(oldlen > newlen);
- xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen),
- false);
+ xfs_mod_fdblocks(ip->i_mount, (int64_t)(oldlen - newlen), 0);
/*
* Nothing to do for disk quota accounting here.
*/
@@ -4149,13 +4148,13 @@ xfs_bmapi_reserve_delalloc(
if (rt) {
error = xfs_mod_frextents(mp, -((int64_t)extsz));
} else {
- error = xfs_mod_fdblocks(mp, -((int64_t)alen), false);
+ error = xfs_mod_fdblocks(mp, -((int64_t)alen), 0);
}

if (error)
goto out_unreserve_quota;

- error = xfs_mod_fdblocks(mp, -((int64_t)indlen), false);
+ error = xfs_mod_fdblocks(mp, -((int64_t)indlen), 0);
if (error)
goto out_unreserve_blocks;

@@ -4184,7 +4183,7 @@ out_unreserve_blocks:
if (rt)
xfs_mod_frextents(mp, extsz);
else
- xfs_mod_fdblocks(mp, alen, false);
+ xfs_mod_fdblocks(mp, alen, 0);
out_unreserve_quota:
if (XFS_IS_QUOTA_ON(mp))
xfs_trans_unreserve_quota_nblks(NULL, ip, (long)alen, 0, rt ?
@@ -5093,7 +5092,7 @@ xfs_bmap_del_extent(
*/
ASSERT(da_old >= da_new);
if (da_old > da_new)
- xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), false);
+ xfs_mod_fdblocks(mp, (int64_t)(da_old - da_new), 0);
done:
*logflagsp = flags;
return error;
@@ -5413,7 +5412,7 @@ xfs_bunmapi(
goto error0;

if (!isrt && wasdel)
- xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount, false);
+ xfs_mod_fdblocks(mp, (int64_t)del.br_blockcount, 0);

bno = del.br_startoff - 1;
nodelete:
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index cfd4210..50a6ccc 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1150,11 +1150,12 @@ int
xfs_mod_fdblocks(
struct xfs_mount *mp,
int64_t delta,
- bool rsvd)
+ uint32_t flags)
{
int64_t lcounter;
long long res_used;
s32 batch;
+ bool rsvd = (flags & XFS_FDBLOCKS_RSVD);

if (delta > 0) {
/*
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index eafe257..bd1043f 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -347,8 +347,10 @@ extern void xfs_unmountfs(xfs_mount_t *);

extern int xfs_mod_icount(struct xfs_mount *mp, int64_t delta);
extern int xfs_mod_ifree(struct xfs_mount *mp, int64_t delta);
+
+#define XFS_FDBLOCKS_RSVD (1 << 0)
extern int xfs_mod_fdblocks(struct xfs_mount *mp, int64_t delta,
- bool reserved);
+ uint32_t flags);
extern int xfs_mod_frextents(struct xfs_mount *mp, int64_t delta);

extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index 20c5366..8aa9d9a 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -172,8 +172,11 @@ xfs_trans_reserve(
uint blocks,
uint rtextents)
{
- int error = 0;
- bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
+ int error = 0;
+ int flags = 0;
+
+ if (tp->t_flags & XFS_TRANS_RESERVE)
+ flags |= XFS_FDBLOCKS_RSVD;

/* Mark this thread as being in a transaction */
current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
@@ -184,7 +187,8 @@ xfs_trans_reserve(
* fail if the count would go below zero.
*/
if (blocks > 0) {
- error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
+ error = xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks),
+ flags);
if (error != 0) {
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
return -ENOSPC;
@@ -259,7 +263,7 @@ undo_log:

undo_blocks:
if (blocks > 0) {
- xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), rsvd);
+ xfs_mod_fdblocks(tp->t_mountp, -((int64_t)blocks), flags);
tp->t_blk_res = 0;
}

@@ -543,12 +547,15 @@ xfs_trans_unreserve_and_mod_sb(
struct xfs_trans *tp)
{
struct xfs_mount *mp = tp->t_mountp;
- bool rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
int64_t blkdelta = 0;
int64_t rtxdelta = 0;
int64_t idelta = 0;
int64_t ifreedelta = 0;
int error;
+ int flags = 0;
+
+ if (tp->t_flags & XFS_TRANS_RESERVE)
+ flags |= XFS_FDBLOCKS_RSVD;

/* calculate deltas */
if (tp->t_blk_res > 0)
@@ -572,7 +579,7 @@ xfs_trans_unreserve_and_mod_sb(

/* apply the per-cpu counters */
if (blkdelta) {
- error = xfs_mod_fdblocks(mp, blkdelta, rsvd);
+ error = xfs_mod_fdblocks(mp, blkdelta, flags);
if (error)
goto out;
}
@@ -680,7 +687,7 @@ out_undo_icount:
xfs_mod_icount(mp, -idelta);
out_undo_fdblocks:
if (blkdelta)
- xfs_mod_fdblocks(mp, -blkdelta, rsvd);
+ xfs_mod_fdblocks(mp, -blkdelta, flags);
out:
ASSERT(error == 0);
return;
--
2.4.11