1 files changed, 559 insertions, 0 deletions

diff --git a/fs/orangefs/super.c b/fs/orangefs/super.c
new file mode 100644
index 000000000000..b9da9a0281c9
--- /dev/null
+++ b/fs/orangefs/super.c
@@ -0,0 +1,559 @@
+/*
+ * (C) 2001 Clemson University and The University of Chicago
+ *
+ * See COPYING in top-level directory.
+ */
+
+#include "protocol.h"
+#include "orangefs-kernel.h"
+#include "orangefs-bufmap.h"
+
+#include <linux/parser.h>
+
+/* a cache for orangefs-inode objects (i.e. orangefs inode private data) */
+static struct kmem_cache *orangefs_inode_cache;
+
+/* list for storing orangefs specific superblocks in use */
+LIST_HEAD(orangefs_superblocks);
+
+DEFINE_SPINLOCK(orangefs_superblocks_lock);
+
+enum {
+        Opt_intr,
+        Opt_acl,
+        Opt_local_lock,
+
+        Opt_err
+};
+
+static const match_table_t tokens = {
+        { Opt_acl,              "acl" },
+        { Opt_intr,             "intr" },
+        { Opt_local_lock,       "local_lock" },
+        { Opt_err,      NULL }
+};
+
+
+static int parse_mount_options(struct super_block *sb, char *options,
+                int silent)
+{
+        struct orangefs_sb_info_s *orangefs_sb = ORANGEFS_SB(sb);
+        substring_t args[MAX_OPT_ARGS];
+        char *p;
+
+        /*
+         * Force any potential flags that might be set from the mount
+         * to zero, ie, initialize to unset.
+         */
+        sb->s_flags &= ~MS_POSIXACL;
+        orangefs_sb->flags &= ~ORANGEFS_OPT_INTR;
+        orangefs_sb->flags &= ~ORANGEFS_OPT_LOCAL_LOCK;
+
+        while ((p = strsep(&options, ",")) != NULL) {
+                int token;
+
+                if (!*p)
+                        continue;
+
+                token = match_token(p, tokens, args);
+                switch (token) {
+                case Opt_acl:
+                        sb->s_flags |= MS_POSIXACL;
+                        break;
+                case Opt_intr:
+                        orangefs_sb->flags |= ORANGEFS_OPT_INTR;
+                        break;
+                case Opt_local_lock:
+                        orangefs_sb->flags |= ORANGEFS_OPT_LOCAL_LOCK;
+                        break;
+                default:
+                        goto fail;
+                }
+        }
+
+        return 0;
+fail:
+        if (!silent)
+                gossip_err("Error: mount option [%s] is not supported.\n", p);
+        return -EINVAL;
+}
+
+static void orangefs_inode_cache_ctor(void *req)
+{
+        struct orangefs_inode_s *orangefs_inode = req;
+
+        inode_init_once(&orangefs_inode->vfs_inode);
+        init_rwsem(&orangefs_inode->xattr_sem);
+
+        orangefs_inode->vfs_inode.i_version = 1;
+}
+
+static struct inode *orangefs_alloc_inode(struct super_block *sb)
+{
+        struct orangefs_inode_s *orangefs_inode;
+
+        orangefs_inode = kmem_cache_alloc(orangefs_inode_cache, GFP_KERNEL);
+        if (orangefs_inode == NULL) {
+                gossip_err("Failed to allocate orangefs_inode\n");
+                return NULL;
+        }
+
+        /*
+         * We want to clear everything except for rw_semaphore and the
+         * vfs_inode.
+         */
+        memset(&orangefs_inode->refn.khandle, 0, 16);
+        orangefs_inode->refn.fs_id = ORANGEFS_FS_ID_NULL;
+        orangefs_inode->last_failed_block_index_read = 0;
+        memset(orangefs_inode->link_target, 0, sizeof(orangefs_inode->link_target));
+        orangefs_inode->pinode_flags = 0;
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "orangefs_alloc_inode: allocated %p\n",
+                     &orangefs_inode->vfs_inode);
+        return &orangefs_inode->vfs_inode;
+}
+
+static void orangefs_destroy_inode(struct inode *inode)
+{
+        struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                        "%s: deallocated %p destroying inode %pU\n",
+                        __func__, orangefs_inode, get_khandle_from_ino(inode));
+
+        kmem_cache_free(orangefs_inode_cache, orangefs_inode);
+}
+
+/*
+ * NOTE: information filled in here is typically reflected in the
+ * output of the system command 'df'
+*/
+static int orangefs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+        int ret = -ENOMEM;
+        struct orangefs_kernel_op_s *new_op = NULL;
+        int flags = 0;
+        struct super_block *sb = NULL;
+
+        sb = dentry->d_sb;
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "orangefs_statfs: called on sb %p (fs_id is %d)\n",
+                     sb,
+                     (int)(ORANGEFS_SB(sb)->fs_id));
+
+        new_op = op_alloc(ORANGEFS_VFS_OP_STATFS);
+        if (!new_op)
+                return ret;
+        new_op->upcall.req.statfs.fs_id = ORANGEFS_SB(sb)->fs_id;
+
+        if (ORANGEFS_SB(sb)->flags & ORANGEFS_OPT_INTR)
+                flags = ORANGEFS_OP_INTERRUPTIBLE;
+
+        ret = service_operation(new_op, "orangefs_statfs", flags);
+
+        if (new_op->downcall.status < 0)
+                goto out_op_release;
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "%s: got %ld blocks available | "
+                     "%ld blocks total | %ld block size | "
+                     "%ld files total | %ld files avail\n",
+                     __func__,
+                     (long)new_op->downcall.resp.statfs.blocks_avail,
+                     (long)new_op->downcall.resp.statfs.blocks_total,
+                     (long)new_op->downcall.resp.statfs.block_size,
+                     (long)new_op->downcall.resp.statfs.files_total,
+                     (long)new_op->downcall.resp.statfs.files_avail);
+
+        buf->f_type = sb->s_magic;
+        memcpy(&buf->f_fsid, &ORANGEFS_SB(sb)->fs_id, sizeof(buf->f_fsid));
+        buf->f_bsize = new_op->downcall.resp.statfs.block_size;
+        buf->f_namelen = ORANGEFS_NAME_MAX;
+
+        buf->f_blocks = (sector_t) new_op->downcall.resp.statfs.blocks_total;
+        buf->f_bfree = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
+        buf->f_bavail = (sector_t) new_op->downcall.resp.statfs.blocks_avail;
+        buf->f_files = (sector_t) new_op->downcall.resp.statfs.files_total;
+        buf->f_ffree = (sector_t) new_op->downcall.resp.statfs.files_avail;
+        buf->f_frsize = sb->s_blocksize;
+
+out_op_release:
+        op_release(new_op);
+        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_statfs: returning %d\n", ret);
+        return ret;
+}
+
+/*
+ * Remount as initiated by VFS layer.  We just need to reparse the mount
+ * options, no need to signal pvfs2-client-core about it.
+ */
+static int orangefs_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount_fs: called\n");
+        return parse_mount_options(sb, data, 1);
+}
+
+/*
+ * Remount as initiated by pvfs2-client-core on restart.  This is used to
+ * repopulate mount information left from previous pvfs2-client-core.
+ *
+ * the idea here is that given a valid superblock, we're
+ * re-initializing the user space client with the initial mount
+ * information specified when the super block was first initialized.
+ * this is very different than the first initialization/creation of a
+ * superblock.  we use the special service_priority_operation to make
+ * sure that the mount gets ahead of any other pending operation that
+ * is waiting for servicing.  this means that the pvfs2-client won't
+ * fail to start several times for all other pending operations before
+ * the client regains all of the mount information from us.
+ * NOTE: this function assumes that the request_mutex is already acquired!
+ */
+int orangefs_remount(struct orangefs_sb_info_s *orangefs_sb)
+{
+        struct orangefs_kernel_op_s *new_op;
+        int ret = -EINVAL;
+
+        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_remount: called\n");
+
+        new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
+        if (!new_op)
+                return -ENOMEM;
+        strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
+                orangefs_sb->devname,
+                ORANGEFS_MAX_SERVER_ADDR_LEN);
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "Attempting ORANGEFS Remount via host %s\n",
+                     new_op->upcall.req.fs_mount.orangefs_config_server);
+
+        /*
+         * we assume that the calling function has already acquired the
+         * request_mutex to prevent other operations from bypassing
+         * this one
+         */
+        ret = service_operation(new_op, "orangefs_remount",
+                ORANGEFS_OP_PRIORITY | ORANGEFS_OP_NO_MUTEX);
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "orangefs_remount: mount got return value of %d\n",
+                     ret);
+        if (ret == 0) {
+                /*
+                 * store the id assigned to this sb -- it's just a
+                 * short-lived mapping that the system interface uses
+                 * to map this superblock to a particular mount entry
+                 */
+                orangefs_sb->id = new_op->downcall.resp.fs_mount.id;
+                orangefs_sb->mount_pending = 0;
+        }
+
+        op_release(new_op);
+        return ret;
+}
+
+int fsid_key_table_initialize(void)
+{
+        return 0;
+}
+
+void fsid_key_table_finalize(void)
+{
+}
+
+/* Called whenever the VFS dirties the inode in response to atime updates */
+static void orangefs_dirty_inode(struct inode *inode, int flags)
+{
+        struct orangefs_inode_s *orangefs_inode = ORANGEFS_I(inode);
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "orangefs_dirty_inode: %pU\n",
+                     get_khandle_from_ino(inode));
+        SetAtimeFlag(orangefs_inode);
+}
+
+static const struct super_operations orangefs_s_ops = {
+        .alloc_inode = orangefs_alloc_inode,
+        .destroy_inode = orangefs_destroy_inode,
+        .dirty_inode = orangefs_dirty_inode,
+        .drop_inode = generic_delete_inode,
+        .statfs = orangefs_statfs,
+        .remount_fs = orangefs_remount_fs,
+        .show_options = generic_show_options,
+};
+
+static struct dentry *orangefs_fh_to_dentry(struct super_block *sb,
+                                  struct fid *fid,
+                                  int fh_len,
+                                  int fh_type)
+{
+        struct orangefs_object_kref refn;
+
+        if (fh_len < 5 || fh_type > 2)
+                return NULL;
+
+        ORANGEFS_khandle_from(&(refn.khandle), fid->raw, 16);
+        refn.fs_id = (u32) fid->raw[4];
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "fh_to_dentry: handle %pU, fs_id %d\n",
+                     &refn.khandle,
+                     refn.fs_id);
+
+        return d_obtain_alias(orangefs_iget(sb, &refn));
+}
+
+static int orangefs_encode_fh(struct inode *inode,
+                    __u32 *fh,
+                    int *max_len,
+                    struct inode *parent)
+{
+        int len = parent ? 10 : 5;
+        int type = 1;
+        struct orangefs_object_kref refn;
+
+        if (*max_len < len) {
+                gossip_lerr("fh buffer is too small for encoding\n");
+                *max_len = len;
+                type = 255;
+                goto out;
+        }
+
+        refn = ORANGEFS_I(inode)->refn;
+        ORANGEFS_khandle_to(&refn.khandle, fh, 16);
+        fh[4] = refn.fs_id;
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "Encoding fh: handle %pU, fsid %u\n",
+                     &refn.khandle,
+                     refn.fs_id);
+
+
+        if (parent) {
+                refn = ORANGEFS_I(parent)->refn;
+                ORANGEFS_khandle_to(&refn.khandle, (char *) fh + 20, 16);
+                fh[9] = refn.fs_id;
+
+                type = 2;
+                gossip_debug(GOSSIP_SUPER_DEBUG,
+                             "Encoding parent: handle %pU, fsid %u\n",
+                             &refn.khandle,
+                             refn.fs_id);
+        }
+        *max_len = len;
+
+out:
+        return type;
+}
+
+static const struct export_operations orangefs_export_ops = {
+        .encode_fh = orangefs_encode_fh,
+        .fh_to_dentry = orangefs_fh_to_dentry,
+};
+
+static int orangefs_fill_sb(struct super_block *sb,
+                struct orangefs_fs_mount_response *fs_mount,
+                void *data, int silent)
+{
+        int ret = -EINVAL;
+        struct inode *root = NULL;
+        struct dentry *root_dentry = NULL;
+        struct orangefs_object_kref root_object;
+
+        /* alloc and init our private orangefs sb info */
+        sb->s_fs_info = kzalloc(sizeof(struct orangefs_sb_info_s), GFP_KERNEL);
+        if (!ORANGEFS_SB(sb))
+                return -ENOMEM;
+        ORANGEFS_SB(sb)->sb = sb;
+
+        ORANGEFS_SB(sb)->root_khandle = fs_mount->root_khandle;
+        ORANGEFS_SB(sb)->fs_id = fs_mount->fs_id;
+        ORANGEFS_SB(sb)->id = fs_mount->id;
+
+        if (data) {
+                ret = parse_mount_options(sb, data, silent);
+                if (ret)
+                        return ret;
+        }
+
+        /* Hang the xattr handlers off the superblock */
+        sb->s_xattr = orangefs_xattr_handlers;
+        sb->s_magic = ORANGEFS_SUPER_MAGIC;
+        sb->s_op = &orangefs_s_ops;
+        sb->s_d_op = &orangefs_dentry_operations;
+
+        sb->s_blocksize = orangefs_bufmap_size_query();
+        sb->s_blocksize_bits = orangefs_bufmap_shift_query();
+        sb->s_maxbytes = MAX_LFS_FILESIZE;
+
+        root_object.khandle = ORANGEFS_SB(sb)->root_khandle;
+        root_object.fs_id = ORANGEFS_SB(sb)->fs_id;
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "get inode %pU, fsid %d\n",
+                     &root_object.khandle,
+                     root_object.fs_id);
+
+        root = orangefs_iget(sb, &root_object);
+        if (IS_ERR(root))
+                return PTR_ERR(root);
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "Allocated root inode [%p] with mode %x\n",
+                     root,
+                     root->i_mode);
+
+        /* allocates and places root dentry in dcache */
+        root_dentry = d_make_root(root);
+        if (!root_dentry)
+                return -ENOMEM;
+
+        sb->s_export_op = &orangefs_export_ops;
+        sb->s_root = root_dentry;
+        return 0;
+}
+
+struct dentry *orangefs_mount(struct file_system_type *fst,
+                           int flags,
+                           const char *devname,
+                           void *data)
+{
+        int ret = -EINVAL;
+        struct super_block *sb = ERR_PTR(-EINVAL);
+        struct orangefs_kernel_op_s *new_op;
+        struct dentry *d = ERR_PTR(-EINVAL);
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "orangefs_mount: called with devname %s\n",
+                     devname);
+
+        if (!devname) {
+                gossip_err("ERROR: device name not specified.\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        new_op = op_alloc(ORANGEFS_VFS_OP_FS_MOUNT);
+        if (!new_op)
+                return ERR_PTR(-ENOMEM);
+
+        strncpy(new_op->upcall.req.fs_mount.orangefs_config_server,
+                devname,
+                ORANGEFS_MAX_SERVER_ADDR_LEN);
+
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "Attempting ORANGEFS Mount via host %s\n",
+                     new_op->upcall.req.fs_mount.orangefs_config_server);
+
+        ret = service_operation(new_op, "orangefs_mount", 0);
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "orangefs_mount: mount got return value of %d\n", ret);
+        if (ret)
+                goto free_op;
+
+        if (new_op->downcall.resp.fs_mount.fs_id == ORANGEFS_FS_ID_NULL) {
+                gossip_err("ERROR: Retrieved null fs_id\n");
+                ret = -EINVAL;
+                goto free_op;
+        }
+
+        sb = sget(fst, NULL, set_anon_super, flags, NULL);
+
+        if (IS_ERR(sb)) {
+                d = ERR_CAST(sb);
+                goto free_op;
+        }
+
+        ret = orangefs_fill_sb(sb,
+              &new_op->downcall.resp.fs_mount, data,
+              flags & MS_SILENT ? 1 : 0);
+
+        if (ret) {
+                d = ERR_PTR(ret);
+                goto free_op;
+        }
+
+        /*
+         * on successful mount, store the devname and data
+         * used
+         */
+        strncpy(ORANGEFS_SB(sb)->devname,
+                devname,
+                ORANGEFS_MAX_SERVER_ADDR_LEN);
+
+        /* mount_pending must be cleared */
+        ORANGEFS_SB(sb)->mount_pending = 0;
+
+        /*
+         * finally, add this sb to our list of known orangefs
+         * sb's
+         */
+        gossip_debug(GOSSIP_SUPER_DEBUG,
+                     "Adding SB %p to orangefs superblocks\n",
+                     ORANGEFS_SB(sb));
+        spin_lock(&orangefs_superblocks_lock);
+        list_add_tail(&ORANGEFS_SB(sb)->list, &orangefs_superblocks);
+        spin_unlock(&orangefs_superblocks_lock);
+        op_release(new_op);
+        return dget(sb->s_root);
+
+free_op:
+        gossip_err("orangefs_mount: mount request failed with %d\n", ret);
+        if (ret == -EINVAL) {
+                gossip_err("Ensure that all orangefs-servers have the same FS configuration files\n");
+                gossip_err("Look at pvfs2-client-core log file (typically /tmp/pvfs2-client.log) for more details\n");
+        }
+
+        op_release(new_op);
+
+        return d;
+}
+
+void orangefs_kill_sb(struct super_block *sb)
+{
+        gossip_debug(GOSSIP_SUPER_DEBUG, "orangefs_kill_sb: called\n");
+
+        /* provided sb cleanup */
+        kill_anon_super(sb);
+
+        /*
+         * issue the unmount to userspace to tell it to remove the
+         * dynamic mount info it has for this superblock
+         */
+         orangefs_unmount_sb(sb);
+
+        /* remove the sb from our list of orangefs specific sb's */
+
+        spin_lock(&orangefs_superblocks_lock);
+        __list_del_entry(&ORANGEFS_SB(sb)->list);       /* not list_del_init */
+        ORANGEFS_SB(sb)->list.prev = NULL;
+        spin_unlock(&orangefs_superblocks_lock);
+
+        /*
+         * make sure that ORANGEFS_DEV_REMOUNT_ALL loop that might've seen us
+         * gets completed before we free the dang thing.
+         */
+        mutex_lock(&request_mutex);
+        mutex_unlock(&request_mutex);
+
+        /* free the orangefs superblock private data */
+        kfree(ORANGEFS_SB(sb));
+}
+
+int orangefs_inode_cache_initialize(void)
+{
+        orangefs_inode_cache = kmem_cache_create("orangefs_inode_cache",
+                                              sizeof(struct orangefs_inode_s),
+                                              0,
+                                              ORANGEFS_CACHE_CREATE_FLAGS,
+                                              orangefs_inode_cache_ctor);
+
+        if (!orangefs_inode_cache) {
+                gossip_err("Cannot create orangefs_inode_cache\n");
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+int orangefs_inode_cache_finalize(void)
+{
+        kmem_cache_destroy(orangefs_inode_cache);
+        return 0;
+}