port async unlinked drain from illumos-nexenta

[mirror_zfs.git] / module / zfs / zfs_vfsops.c

diff --git a/module/zfs/zfs_vfsops.c b/module/zfs/zfs_vfsops.c
index c9e314caa223e2852c0ec78a694386bae7ce0bac..cdc1bc70758136fb47c2bb68dded69cf7d432f4b 100644 (file)
--- a/module/zfs/zfs_vfsops.c
+++ b/module/zfs/zfs_vfsops.c
@@ -56,6 +56,7 @@
 #include <sys/dmu_objset.h>
 #include <sys/spa_boot.h>
 #include <sys/zpl.h>
+#include <linux/vfs_compat.h>
 #include "zfs_comutil.h"
 
 enum {
@@ -249,7 +250,7 @@ zfsvfs_parse_options(char *mntopts, vfs_t **vfsp)
 boolean_t
 zfs_is_readonly(zfsvfs_t *zfsvfs)
 {
-       return (!!(zfsvfs->z_sb->s_flags & MS_RDONLY));
+       return (!!(zfsvfs->z_sb->s_flags & SB_RDONLY));
 }
 
 /*ARGSUSED*/
@@ -336,15 +337,15 @@ acltype_changed_cb(void *arg, uint64_t newval)
        switch (newval) {
        case ZFS_ACLTYPE_OFF:
                zfsvfs->z_acl_type = ZFS_ACLTYPE_OFF;
-               zfsvfs->z_sb->s_flags &= ~MS_POSIXACL;
+               zfsvfs->z_sb->s_flags &= ~SB_POSIXACL;
                break;
        case ZFS_ACLTYPE_POSIXACL:
 #ifdef CONFIG_FS_POSIX_ACL
                zfsvfs->z_acl_type = ZFS_ACLTYPE_POSIXACL;
-               zfsvfs->z_sb->s_flags |= MS_POSIXACL;
+               zfsvfs->z_sb->s_flags |= SB_POSIXACL;
 #else
                zfsvfs->z_acl_type = ZFS_ACLTYPE_OFF;
-               zfsvfs->z_sb->s_flags &= ~MS_POSIXACL;
+               zfsvfs->z_sb->s_flags &= ~SB_POSIXACL;
 #endif /* CONFIG_FS_POSIX_ACL */
                break;
        default:
@@ -373,9 +374,9 @@ readonly_changed_cb(void *arg, uint64_t newval)
                return;
 
        if (newval)
-               sb->s_flags |= MS_RDONLY;
+               sb->s_flags |= SB_RDONLY;
        else
-               sb->s_flags &= ~MS_RDONLY;
+               sb->s_flags &= ~SB_RDONLY;
 }
 
 static void
@@ -403,9 +404,9 @@ nbmand_changed_cb(void *arg, uint64_t newval)
                return;
 
        if (newval == TRUE)
-               sb->s_flags |= MS_MANDLOCK;
+               sb->s_flags |= SB_MANDLOCK;
        else
-               sb->s_flags &= ~MS_MANDLOCK;
+               sb->s_flags &= ~SB_MANDLOCK;
 }
 
 static void
@@ -1177,6 +1178,10 @@ zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os)
                return (error);
        }
 
+       zfsvfs->z_drain_task = TASKQID_INVALID;
+       zfsvfs->z_draining = B_FALSE;
+       zfsvfs->z_drain_cancel = B_TRUE;
+
        *zfvp = zfsvfs;
        return (0);
 }
@@ -1199,14 +1204,27 @@ zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
         * operations out since we closed the ZIL.
         */
        if (mounting) {
+               ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL);
+               dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os);
+
                /*
                 * During replay we remove the read only flag to
                 * allow replays to succeed.
                 */
-               if (readonly != 0)
+               if (readonly != 0) {
                        readonly_changed_cb(zfsvfs, B_FALSE);
-               else
+               } else {
+                       zap_stats_t zs;
+                       if (zap_get_stats(zfsvfs->z_os, zfsvfs->z_unlinkedobj,
+                           &zs) == 0) {
+                               dataset_kstats_update_nunlinks_kstat(
+                                   &zfsvfs->z_kstat, zs.zs_num_entries);
+                       }
+                       dprintf_ds(zfsvfs->z_os->os_dsl_dataset,
+                           "num_entries in unlinked set: %llu",
+                           zs.zs_num_entries);
                        zfs_unlinked_drain(zfsvfs);
+               }
 
                /*
                 * Parse and replay the intent log.
@@ -1249,9 +1267,6 @@ zfsvfs_setup(zfsvfs_t *zfsvfs, boolean_t mounting)
                /* restore readonly bit */
                if (readonly != 0)
                        readonly_changed_cb(zfsvfs, B_TRUE);
-
-               ASSERT3P(zfsvfs->z_kstat.dk_kstats, ==, NULL);
-               dataset_kstats_create(&zfsvfs->z_kstat, zfsvfs->z_os);
        }
 
        /*
@@ -1632,6 +1647,8 @@ zfsvfs_teardown(zfsvfs_t *zfsvfs, boolean_t unmounting)
 {
        znode_t *zp;
 
+       zfs_unlinked_drain_stop_wait(zfsvfs);
+
        /*
         * If someone has not already unmounted this file system,
         * drain the iput_taskq to ensure all active references to the
@@ -1883,6 +1900,7 @@ zfs_preumount(struct super_block *sb)
 
        /* zfsvfs is NULL when zfs_domount fails during mount */
        if (zfsvfs) {
+               zfs_unlinked_drain_stop_wait(zfsvfs);
                zfsctl_destroy(sb->s_fs_info);
                /*
                 * Wait for iput_async before entering evict_inodes in
@@ -1954,8 +1972,8 @@ zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm)
        int error;
 
        if ((issnap || !spa_writeable(dmu_objset_spa(zfsvfs->z_os))) &&
-           !(*flags & MS_RDONLY)) {
-               *flags |= MS_RDONLY;
+           !(*flags & SB_RDONLY)) {
+               *flags |= SB_RDONLY;
                return (EROFS);
        }
 
@@ -1963,7 +1981,7 @@ zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm)
        if (error)
                return (error);
 
-       if (!zfs_is_readonly(zfsvfs) && (*flags & MS_RDONLY))
+       if (!zfs_is_readonly(zfsvfs) && (*flags & SB_RDONLY))
                txg_wait_synced(dmu_objset_pool(zfsvfs->z_os), 0);
 
        zfs_unregister_callbacks(zfsvfs);
@@ -2158,6 +2176,15 @@ zfs_resume_fs(zfsvfs_t *zfsvfs, dsl_dataset_t *ds)
        }
        mutex_exit(&zfsvfs->z_znodes_lock);
 
+       if (!zfs_is_readonly(zfsvfs) && !zfsvfs->z_unmounted) {
+               /*
+                * zfs_suspend_fs() could have interrupted freeing
+                * of dnodes. We need to restart this freeing so
+                * that we don't "leak" the space.
+                */
+               zfs_unlinked_drain(zfsvfs);
+       }
+
 bail:
        /* release the VFS ops */
        rw_exit(&zfsvfs->z_teardown_inactive_lock);