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zfs: make use of getnewvnode_reserve in zfs_mknode and zfs_zget

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getnewvnode_reserve helps to avoid "recursing" back into zfs code
via getnewvnode when that latter needs to reclaim some vnodes.
zfs code may hold a number of locks around getnewvnode and doesn't
expect any recursion to happen on those locks, because that never
happens in solaris.

I believe that this change also eleiminates a need for the delayed
znode destruction via the taskqueue.

Many thanks to kib for devising getnewvnode_reserve.

Reported by:	flo
Tested by:	bapt, kwm, swills
MFC after:	2 weeks
X-MFC after:	r241556
This commit is contained in:
Andriy Gapon 2012-10-17 10:59:56 +00:00
parent 6684e46988
commit edb085b8ab
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=241628
1 changed files with 7 additions and 0 deletions
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7
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_znode.c
View file

@ -856,6 +856,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
}
}
getnewvnode_reserve(1);
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj);
VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db));
@ -1042,6 +1043,7 @@ zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr,
KASSERT(err == 0, ("insmntque() failed: error %d", err));
}
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj);
getnewvnode_drop_reserve();
}
/*
@ -1152,12 +1154,14 @@ zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
*zpp = NULL;
getnewvnode_reserve(1);
again:
ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db);
if (err) {
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (err);
}
@ -1168,6 +1172,7 @@ zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
doi.doi_bonus_size < sizeof (znode_phys_t)))) {
sa_buf_rele(db, NULL);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (EINVAL);
}
@ -1231,6 +1236,7 @@ zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
sa_buf_rele(db, NULL);
mutex_exit(&zp->z_lock);
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (err);
}
@ -1266,6 +1272,7 @@ zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
}
}
ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
getnewvnode_drop_reserve();
return (err);
}