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Conserve stack in zfs_sa_upgrade() 

As always under Linux stack space is at a premium.  Relocate two
20 element sa_bulk_attr_t arrays in zfs_sa_upgrade() from the stack
to the heap.
This commit is contained in:
Brian Behlendorf 2010-12-17 14:21:46 -08:00
parent e5c39b95a7
commit 1ee1b76786
1 changed files with 8 additions and 4 deletions
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12
module/zfs/zfs_sa.c
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@ -199,9 +199,8 @@ zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
dmu_buf_t *db = sa_get_db(hdl);
znode_t *zp = sa_get_userdata(hdl);
zfsvfs_t *zfsvfs = zp->z_zfsvfs;
sa_bulk_attr_t bulk[20];
int count = 0;
sa_bulk_attr_t sa_attrs[20] = { 0 };
sa_bulk_attr_t *bulk, *sa_attrs;
zfs_acl_locator_cb_t locate = { 0 };
uint64_t uid, gid, mode, rdev, xattr, parent;
uint64_t crtime[2], mtime[2], ctime[2];
@ -237,6 +236,7 @@ zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
}
/* First do a bulk query of the attributes that aren't cached */
bulk = kmem_alloc(sizeof(sa_bulk_attr_t) * 20, KM_SLEEP);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, &mtime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, &ctime, 16);
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CRTIME(zfsvfs), NULL, &crtime, 16);
@ -249,15 +249,17 @@ zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ZNODE_ACL(zfsvfs), NULL,
&znode_acl, 88);
if (sa_bulk_lookup_locked(hdl, bulk, count) != 0)
if (sa_bulk_lookup_locked(hdl, bulk, count) != 0) {
kmem_free(bulk, sizeof(sa_bulk_attr_t) * 20);
goto done;
}
/*
* While the order here doesn't matter its best to try and organize
* it is such a way to pick up an already existing layout number
*/
count = 0;
sa_attrs = kmem_zalloc(sizeof(sa_bulk_attr_t) * 20, KM_SLEEP);
SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8);
SA_ADD_BULK_ATTR(sa_attrs, count, SA_ZPL_SIZE(zfsvfs), NULL,
&zp->z_size, 8);
@ -316,6 +318,8 @@ zfs_sa_upgrade(sa_handle_t *hdl, dmu_tx_t *tx)
znode_acl.z_acl_extern_obj, tx));
zp->z_is_sa = B_TRUE;
kmem_free(sa_attrs, sizeof(sa_bulk_attr_t) * 20);
kmem_free(bulk, sizeof(sa_bulk_attr_t) * 20);
done:
if (drop_lock)
mutex_exit(&zp->z_lock);