diff options
Diffstat (limited to 'fs/orangefs/super.c')
| -rw-r--r-- | fs/orangefs/super.c | 559 |
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; +} |