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Diffstat (limited to 'sys/contrib/openzfs/module/os/linux/zfs/zpl_super.c')
-rw-r--r--sys/contrib/openzfs/module/os/linux/zfs/zpl_super.c365
1 files changed, 365 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/module/os/linux/zfs/zpl_super.c b/sys/contrib/openzfs/module/os/linux/zfs/zpl_super.c
new file mode 100644
index 000000000000..c2fd3fee1401
--- /dev/null
+++ b/sys/contrib/openzfs/module/os/linux/zfs/zpl_super.c
@@ -0,0 +1,365 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2011, Lawrence Livermore National Security, LLC.
+ */
+
+
+#include <sys/zfs_znode.h>
+#include <sys/zfs_vfsops.h>
+#include <sys/zfs_vnops.h>
+#include <sys/zfs_ctldir.h>
+#include <sys/zpl.h>
+
+
+static struct inode *
+zpl_inode_alloc(struct super_block *sb)
+{
+ struct inode *ip;
+
+ VERIFY3S(zfs_inode_alloc(sb, &ip), ==, 0);
+ inode_set_iversion(ip, 1);
+
+ return (ip);
+}
+
+static void
+zpl_inode_destroy(struct inode *ip)
+{
+ ASSERT(atomic_read(&ip->i_count) == 0);
+ zfs_inode_destroy(ip);
+}
+
+/*
+ * Called from __mark_inode_dirty() to reflect that something in the
+ * inode has changed. We use it to ensure the znode system attributes
+ * are always strictly update to date with respect to the inode.
+ */
+#ifdef HAVE_DIRTY_INODE_WITH_FLAGS
+static void
+zpl_dirty_inode(struct inode *ip, int flags)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ zfs_dirty_inode(ip, flags);
+ spl_fstrans_unmark(cookie);
+}
+#else
+static void
+zpl_dirty_inode(struct inode *ip)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ zfs_dirty_inode(ip, 0);
+ spl_fstrans_unmark(cookie);
+}
+#endif /* HAVE_DIRTY_INODE_WITH_FLAGS */
+
+/*
+ * When ->drop_inode() is called its return value indicates if the
+ * inode should be evicted from the inode cache. If the inode is
+ * unhashed and has no links the default policy is to evict it
+ * immediately.
+ *
+ * The ->evict_inode() callback must minimally truncate the inode pages,
+ * and call clear_inode(). For 2.6.35 and later kernels this will
+ * simply update the inode state, with the sync occurring before the
+ * truncate in evict(). For earlier kernels clear_inode() maps to
+ * end_writeback() which is responsible for completing all outstanding
+ * write back. In either case, once this is done it is safe to cleanup
+ * any remaining inode specific data via zfs_inactive().
+ * remaining filesystem specific data.
+ */
+static void
+zpl_evict_inode(struct inode *ip)
+{
+ fstrans_cookie_t cookie;
+
+ cookie = spl_fstrans_mark();
+ truncate_setsize(ip, 0);
+ clear_inode(ip);
+ zfs_inactive(ip);
+ spl_fstrans_unmark(cookie);
+}
+
+static void
+zpl_put_super(struct super_block *sb)
+{
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_umount(sb);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+}
+
+static int
+zpl_sync_fs(struct super_block *sb, int wait)
+{
+ fstrans_cookie_t cookie;
+ cred_t *cr = CRED();
+ int error;
+
+ crhold(cr);
+ cookie = spl_fstrans_mark();
+ error = -zfs_sync(sb, wait, cr);
+ spl_fstrans_unmark(cookie);
+ crfree(cr);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_statfs(struct dentry *dentry, struct kstatfs *statp)
+{
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_statvfs(dentry->d_inode, statp);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+
+ /*
+ * If required by a 32-bit system call, dynamically scale the
+ * block size up to 16MiB and decrease the block counts. This
+ * allows for a maximum size of 64EiB to be reported. The file
+ * counts must be artificially capped at 2^32-1.
+ */
+ if (unlikely(zpl_is_32bit_api())) {
+ while (statp->f_blocks > UINT32_MAX &&
+ statp->f_bsize < SPA_MAXBLOCKSIZE) {
+ statp->f_frsize <<= 1;
+ statp->f_bsize <<= 1;
+
+ statp->f_blocks >>= 1;
+ statp->f_bfree >>= 1;
+ statp->f_bavail >>= 1;
+ }
+
+ uint64_t usedobjs = statp->f_files - statp->f_ffree;
+ statp->f_ffree = MIN(statp->f_ffree, UINT32_MAX - usedobjs);
+ statp->f_files = statp->f_ffree + usedobjs;
+ }
+
+ return (error);
+}
+
+static int
+zpl_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+ zfs_mnt_t zm = { .mnt_osname = NULL, .mnt_data = data };
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_remount(sb, flags, &zm);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+__zpl_show_devname(struct seq_file *seq, zfsvfs_t *zfsvfs)
+{
+ ZPL_ENTER(zfsvfs);
+
+ char *fsname = kmem_alloc(ZFS_MAX_DATASET_NAME_LEN, KM_SLEEP);
+ dmu_objset_name(zfsvfs->z_os, fsname);
+
+ for (int i = 0; fsname[i] != 0; i++) {
+ /*
+ * Spaces in the dataset name must be converted to their
+ * octal escape sequence for getmntent(3) to correctly
+ * parse then fsname portion of /proc/self/mounts.
+ */
+ if (fsname[i] == ' ') {
+ seq_puts(seq, "\\040");
+ } else {
+ seq_putc(seq, fsname[i]);
+ }
+ }
+
+ kmem_free(fsname, ZFS_MAX_DATASET_NAME_LEN);
+
+ ZPL_EXIT(zfsvfs);
+
+ return (0);
+}
+
+static int
+zpl_show_devname(struct seq_file *seq, struct dentry *root)
+{
+ return (__zpl_show_devname(seq, root->d_sb->s_fs_info));
+}
+
+static int
+__zpl_show_options(struct seq_file *seq, zfsvfs_t *zfsvfs)
+{
+ seq_printf(seq, ",%s",
+ zfsvfs->z_flags & ZSB_XATTR ? "xattr" : "noxattr");
+
+#ifdef CONFIG_FS_POSIX_ACL
+ switch (zfsvfs->z_acl_type) {
+ case ZFS_ACLTYPE_POSIX:
+ seq_puts(seq, ",posixacl");
+ break;
+ default:
+ seq_puts(seq, ",noacl");
+ break;
+ }
+#endif /* CONFIG_FS_POSIX_ACL */
+
+ return (0);
+}
+
+static int
+zpl_show_options(struct seq_file *seq, struct dentry *root)
+{
+ return (__zpl_show_options(seq, root->d_sb->s_fs_info));
+}
+
+static int
+zpl_fill_super(struct super_block *sb, void *data, int silent)
+{
+ zfs_mnt_t *zm = (zfs_mnt_t *)data;
+ fstrans_cookie_t cookie;
+ int error;
+
+ cookie = spl_fstrans_mark();
+ error = -zfs_domount(sb, zm, silent);
+ spl_fstrans_unmark(cookie);
+ ASSERT3S(error, <=, 0);
+
+ return (error);
+}
+
+static int
+zpl_test_super(struct super_block *s, void *data)
+{
+ zfsvfs_t *zfsvfs = s->s_fs_info;
+ objset_t *os = data;
+
+ if (zfsvfs == NULL)
+ return (0);
+
+ return (os == zfsvfs->z_os);
+}
+
+static struct super_block *
+zpl_mount_impl(struct file_system_type *fs_type, int flags, zfs_mnt_t *zm)
+{
+ struct super_block *s;
+ objset_t *os;
+ int err;
+
+ err = dmu_objset_hold(zm->mnt_osname, FTAG, &os);
+ if (err)
+ return (ERR_PTR(-err));
+
+ /*
+ * The dsl pool lock must be released prior to calling sget().
+ * It is possible sget() may block on the lock in grab_super()
+ * while deactivate_super() holds that same lock and waits for
+ * a txg sync. If the dsl_pool lock is held over sget()
+ * this can prevent the pool sync and cause a deadlock.
+ */
+ dsl_dataset_long_hold(dmu_objset_ds(os), FTAG);
+ dsl_pool_rele(dmu_objset_pool(os), FTAG);
+
+ s = sget(fs_type, zpl_test_super, set_anon_super, flags, os);
+
+ dsl_dataset_long_rele(dmu_objset_ds(os), FTAG);
+ dsl_dataset_rele(dmu_objset_ds(os), FTAG);
+
+ if (IS_ERR(s))
+ return (ERR_CAST(s));
+
+ if (s->s_root == NULL) {
+ err = zpl_fill_super(s, zm, flags & SB_SILENT ? 1 : 0);
+ if (err) {
+ deactivate_locked_super(s);
+ return (ERR_PTR(err));
+ }
+ s->s_flags |= SB_ACTIVE;
+ } else if ((flags ^ s->s_flags) & SB_RDONLY) {
+ deactivate_locked_super(s);
+ return (ERR_PTR(-EBUSY));
+ }
+
+ return (s);
+}
+
+static struct dentry *
+zpl_mount(struct file_system_type *fs_type, int flags,
+ const char *osname, void *data)
+{
+ zfs_mnt_t zm = { .mnt_osname = osname, .mnt_data = data };
+
+ struct super_block *sb = zpl_mount_impl(fs_type, flags, &zm);
+ if (IS_ERR(sb))
+ return (ERR_CAST(sb));
+
+ return (dget(sb->s_root));
+}
+
+static void
+zpl_kill_sb(struct super_block *sb)
+{
+ zfs_preumount(sb);
+ kill_anon_super(sb);
+}
+
+void
+zpl_prune_sb(int64_t nr_to_scan, void *arg)
+{
+ struct super_block *sb = (struct super_block *)arg;
+ int objects = 0;
+
+ (void) -zfs_prune(sb, nr_to_scan, &objects);
+}
+
+const struct super_operations zpl_super_operations = {
+ .alloc_inode = zpl_inode_alloc,
+ .destroy_inode = zpl_inode_destroy,
+ .dirty_inode = zpl_dirty_inode,
+ .write_inode = NULL,
+ .evict_inode = zpl_evict_inode,
+ .put_super = zpl_put_super,
+ .sync_fs = zpl_sync_fs,
+ .statfs = zpl_statfs,
+ .remount_fs = zpl_remount_fs,
+ .show_devname = zpl_show_devname,
+ .show_options = zpl_show_options,
+ .show_stats = NULL,
+};
+
+struct file_system_type zpl_fs_type = {
+ .owner = THIS_MODULE,
+ .name = ZFS_DRIVER,
+ .mount = zpl_mount,
+ .kill_sb = zpl_kill_sb,
+};