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![Nick Piggin](/assets/img/avatar_default.png)
RCU free the struct inode. This will allow: - Subsequent store-free path walking patch. The inode must be consulted for permissions when walking, so an RCU inode reference is a must. - sb_inode_list_lock to be moved inside i_lock because sb list walkers who want to take i_lock no longer need to take sb_inode_list_lock to walk the list in the first place. This will simplify and optimize locking. - Could remove some nested trylock loops in dcache code - Could potentially simplify things a bit in VM land. Do not need to take the page lock to follow page->mapping. The downsides of this is the performance cost of using RCU. In a simple creat/unlink microbenchmark, performance drops by about 10% due to inability to reuse cache-hot slab objects. As iterations increase and RCU freeing starts kicking over, this increases to about 20%. In cases where inode lifetimes are longer (ie. many inodes may be allocated during the average life span of a single inode), a lot of this cache reuse is not applicable, so the regression caused by this patch is smaller. The cache-hot regression could largely be avoided by using SLAB_DESTROY_BY_RCU, however this adds some complexity to list walking and store-free path walking, so I prefer to implement this at a later date, if it is shown to be a win in real situations. I haven't found a regression in any non-micro benchmark so I doubt it will be a problem. Signed-off-by: Nick Piggin <npiggin@kernel.dk>
853 lines
22 KiB
C
853 lines
22 KiB
C
/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com)
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* Copyright (C) 2008, 2009
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* Boaz Harrosh <bharrosh@panasas.com>
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*
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* Copyrights for code taken from ext2:
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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* from
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* linux/fs/minix/inode.c
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* This file is part of exofs.
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*
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* exofs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation. Since it is based on ext2, and the only
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* valid version of GPL for the Linux kernel is version 2, the only valid
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* version of GPL for exofs is version 2.
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*
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* exofs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with exofs; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/string.h>
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#include <linux/parser.h>
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#include <linux/vfs.h>
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#include <linux/random.h>
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#include <linux/exportfs.h>
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#include <linux/slab.h>
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#include "exofs.h"
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/******************************************************************************
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* MOUNT OPTIONS
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*****************************************************************************/
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/*
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* struct to hold what we get from mount options
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*/
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struct exofs_mountopt {
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const char *dev_name;
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uint64_t pid;
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int timeout;
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};
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/*
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* exofs-specific mount-time options.
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*/
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enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };
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/*
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* Our mount-time options. These should ideally be 64-bit unsigned, but the
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* kernel's parsing functions do not currently support that. 32-bit should be
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* sufficient for most applications now.
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*/
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static match_table_t tokens = {
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{Opt_pid, "pid=%u"},
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{Opt_to, "to=%u"},
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{Opt_err, NULL}
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};
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/*
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* The main option parsing method. Also makes sure that all of the mandatory
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* mount options were set.
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*/
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static int parse_options(char *options, struct exofs_mountopt *opts)
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{
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char *p;
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substring_t args[MAX_OPT_ARGS];
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int option;
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bool s_pid = false;
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EXOFS_DBGMSG("parse_options %s\n", options);
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/* defaults */
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memset(opts, 0, sizeof(*opts));
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opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
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while ((p = strsep(&options, ",")) != NULL) {
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int token;
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char str[32];
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if (!*p)
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continue;
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token = match_token(p, tokens, args);
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switch (token) {
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case Opt_pid:
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if (0 == match_strlcpy(str, &args[0], sizeof(str)))
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return -EINVAL;
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opts->pid = simple_strtoull(str, NULL, 0);
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if (opts->pid < EXOFS_MIN_PID) {
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EXOFS_ERR("Partition ID must be >= %u",
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EXOFS_MIN_PID);
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return -EINVAL;
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}
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s_pid = 1;
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break;
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case Opt_to:
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if (match_int(&args[0], &option))
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return -EINVAL;
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if (option <= 0) {
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EXOFS_ERR("Timout must be > 0");
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return -EINVAL;
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}
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opts->timeout = option * HZ;
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break;
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}
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}
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if (!s_pid) {
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EXOFS_ERR("Need to specify the following options:\n");
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EXOFS_ERR(" -o pid=pid_no_to_use\n");
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return -EINVAL;
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}
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return 0;
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}
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/******************************************************************************
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* INODE CACHE
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*****************************************************************************/
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/*
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* Our inode cache. Isn't it pretty?
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*/
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static struct kmem_cache *exofs_inode_cachep;
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/*
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* Allocate an inode in the cache
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*/
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static struct inode *exofs_alloc_inode(struct super_block *sb)
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{
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struct exofs_i_info *oi;
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oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
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if (!oi)
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return NULL;
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oi->vfs_inode.i_version = 1;
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return &oi->vfs_inode;
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}
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static void exofs_i_callback(struct rcu_head *head)
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{
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struct inode *inode = container_of(head, struct inode, i_rcu);
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INIT_LIST_HEAD(&inode->i_dentry);
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kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
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}
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/*
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* Remove an inode from the cache
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*/
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static void exofs_destroy_inode(struct inode *inode)
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{
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call_rcu(&inode->i_rcu, exofs_i_callback);
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}
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/*
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* Initialize the inode
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*/
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static void exofs_init_once(void *foo)
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{
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struct exofs_i_info *oi = foo;
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inode_init_once(&oi->vfs_inode);
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}
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/*
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* Create and initialize the inode cache
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*/
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static int init_inodecache(void)
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{
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exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
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sizeof(struct exofs_i_info), 0,
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SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
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exofs_init_once);
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if (exofs_inode_cachep == NULL)
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return -ENOMEM;
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return 0;
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}
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/*
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* Destroy the inode cache
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*/
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static void destroy_inodecache(void)
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{
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kmem_cache_destroy(exofs_inode_cachep);
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}
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/******************************************************************************
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* SUPERBLOCK FUNCTIONS
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*****************************************************************************/
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static const struct super_operations exofs_sops;
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static const struct export_operations exofs_export_ops;
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/*
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* Write the superblock to the OSD
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*/
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int exofs_sync_fs(struct super_block *sb, int wait)
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{
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struct exofs_sb_info *sbi;
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struct exofs_fscb *fscb;
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struct exofs_io_state *ios;
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int ret = -ENOMEM;
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lock_super(sb);
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sbi = sb->s_fs_info;
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fscb = &sbi->s_fscb;
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ret = exofs_get_io_state(&sbi->layout, &ios);
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if (ret)
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goto out;
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/* Note: We only write the changing part of the fscb. .i.e upto the
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* the fscb->s_dev_table_oid member. There is no read-modify-write
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* here.
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*/
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ios->length = offsetof(struct exofs_fscb, s_dev_table_oid);
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memset(fscb, 0, ios->length);
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fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
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fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
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fscb->s_magic = cpu_to_le16(sb->s_magic);
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fscb->s_newfs = 0;
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fscb->s_version = EXOFS_FSCB_VER;
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ios->obj.id = EXOFS_SUPER_ID;
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ios->offset = 0;
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ios->kern_buff = fscb;
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ios->cred = sbi->s_cred;
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ret = exofs_sbi_write(ios);
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if (unlikely(ret)) {
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EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__);
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goto out;
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}
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sb->s_dirt = 0;
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out:
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EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret);
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exofs_put_io_state(ios);
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unlock_super(sb);
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return ret;
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}
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static void exofs_write_super(struct super_block *sb)
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{
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if (!(sb->s_flags & MS_RDONLY))
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exofs_sync_fs(sb, 1);
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else
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sb->s_dirt = 0;
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}
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static void _exofs_print_device(const char *msg, const char *dev_path,
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struct osd_dev *od, u64 pid)
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{
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const struct osd_dev_info *odi = osduld_device_info(od);
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printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n",
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msg, dev_path ?: "", odi->osdname, _LLU(pid));
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}
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void exofs_free_sbi(struct exofs_sb_info *sbi)
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{
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while (sbi->layout.s_numdevs) {
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int i = --sbi->layout.s_numdevs;
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struct osd_dev *od = sbi->layout.s_ods[i];
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if (od) {
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sbi->layout.s_ods[i] = NULL;
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osduld_put_device(od);
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}
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}
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kfree(sbi);
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}
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/*
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* This function is called when the vfs is freeing the superblock. We just
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* need to free our own part.
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*/
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static void exofs_put_super(struct super_block *sb)
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{
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int num_pend;
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struct exofs_sb_info *sbi = sb->s_fs_info;
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if (sb->s_dirt)
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exofs_write_super(sb);
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/* make sure there are no pending commands */
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for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
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num_pend = atomic_read(&sbi->s_curr_pending)) {
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wait_queue_head_t wq;
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init_waitqueue_head(&wq);
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wait_event_timeout(wq,
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(atomic_read(&sbi->s_curr_pending) == 0),
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msecs_to_jiffies(100));
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}
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_exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0],
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sbi->layout.s_pid);
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bdi_destroy(&sbi->bdi);
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exofs_free_sbi(sbi);
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sb->s_fs_info = NULL;
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}
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static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs,
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struct exofs_device_table *dt)
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{
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u64 stripe_length;
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sbi->data_map.odm_num_comps =
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le32_to_cpu(dt->dt_data_map.cb_num_comps);
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sbi->data_map.odm_stripe_unit =
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le64_to_cpu(dt->dt_data_map.cb_stripe_unit);
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sbi->data_map.odm_group_width =
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le32_to_cpu(dt->dt_data_map.cb_group_width);
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sbi->data_map.odm_group_depth =
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le32_to_cpu(dt->dt_data_map.cb_group_depth);
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sbi->data_map.odm_mirror_cnt =
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le32_to_cpu(dt->dt_data_map.cb_mirror_cnt);
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sbi->data_map.odm_raid_algorithm =
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le32_to_cpu(dt->dt_data_map.cb_raid_algorithm);
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/* FIXME: Only raid0 for now. if not so, do not mount */
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if (sbi->data_map.odm_num_comps != numdevs) {
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EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n",
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sbi->data_map.odm_num_comps, numdevs);
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return -EINVAL;
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}
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if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) {
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EXOFS_ERR("Only RAID_0 for now\n");
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return -EINVAL;
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}
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if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) {
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EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n",
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numdevs, sbi->data_map.odm_mirror_cnt);
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return -EINVAL;
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}
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if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) {
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EXOFS_ERR("Stripe Unit(0x%llx)"
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" must be Multples of PAGE_SIZE(0x%lx)\n",
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_LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE);
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return -EINVAL;
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}
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sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit;
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sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1;
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if (sbi->data_map.odm_group_width) {
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sbi->layout.group_width = sbi->data_map.odm_group_width;
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sbi->layout.group_depth = sbi->data_map.odm_group_depth;
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if (!sbi->layout.group_depth) {
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EXOFS_ERR("group_depth == 0 && group_width != 0\n");
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return -EINVAL;
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}
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sbi->layout.group_count = sbi->data_map.odm_num_comps /
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sbi->layout.mirrors_p1 /
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sbi->data_map.odm_group_width;
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} else {
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if (sbi->data_map.odm_group_depth) {
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printk(KERN_NOTICE "Warning: group_depth ignored "
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"group_width == 0 && group_depth == %d\n",
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sbi->data_map.odm_group_depth);
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sbi->data_map.odm_group_depth = 0;
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}
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sbi->layout.group_width = sbi->data_map.odm_num_comps /
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sbi->layout.mirrors_p1;
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sbi->layout.group_depth = -1;
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sbi->layout.group_count = 1;
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}
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stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit;
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if (stripe_length >= (1ULL << 32)) {
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EXOFS_ERR("Total Stripe length(0x%llx)"
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" >= 32bit is not supported\n", _LLU(stripe_length));
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return -EINVAL;
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}
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return 0;
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}
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/* @odi is valid only as long as @fscb_dev is valid */
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static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev,
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struct osd_dev_info *odi)
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{
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odi->systemid_len = le32_to_cpu(dt_dev->systemid_len);
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memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len);
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odi->osdname_len = le32_to_cpu(dt_dev->osdname_len);
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odi->osdname = dt_dev->osdname;
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/* FIXME support long names. Will need a _put function */
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if (dt_dev->long_name_offset)
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return -EINVAL;
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/* Make sure osdname is printable!
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* mkexofs should give us space for a null-terminator else the
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* device-table is invalid.
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*/
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if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname)))
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odi->osdname_len = sizeof(dt_dev->osdname) - 1;
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dt_dev->osdname[odi->osdname_len] = 0;
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/* If it's all zeros something is bad we read past end-of-obj */
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return !(odi->systemid_len || odi->osdname_len);
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}
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static int exofs_read_lookup_dev_table(struct exofs_sb_info **psbi,
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unsigned table_count)
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{
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struct exofs_sb_info *sbi = *psbi;
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struct osd_dev *fscb_od;
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struct osd_obj_id obj = {.partition = sbi->layout.s_pid,
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.id = EXOFS_DEVTABLE_ID};
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struct exofs_device_table *dt;
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unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) +
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sizeof(*dt);
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unsigned numdevs, i;
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int ret;
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dt = kmalloc(table_bytes, GFP_KERNEL);
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if (unlikely(!dt)) {
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EXOFS_ERR("ERROR: allocating %x bytes for device table\n",
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table_bytes);
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return -ENOMEM;
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}
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fscb_od = sbi->layout.s_ods[0];
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sbi->layout.s_ods[0] = NULL;
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sbi->layout.s_numdevs = 0;
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ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes);
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if (unlikely(ret)) {
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EXOFS_ERR("ERROR: reading device table\n");
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goto out;
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}
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numdevs = le64_to_cpu(dt->dt_num_devices);
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if (unlikely(!numdevs)) {
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ret = -EINVAL;
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goto out;
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}
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WARN_ON(table_count != numdevs);
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ret = _read_and_match_data_map(sbi, numdevs, dt);
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if (unlikely(ret))
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goto out;
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if (likely(numdevs > 1)) {
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unsigned size = numdevs * sizeof(sbi->layout.s_ods[0]);
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sbi = krealloc(sbi, sizeof(*sbi) + size, GFP_KERNEL);
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if (unlikely(!sbi)) {
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ret = -ENOMEM;
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goto out;
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}
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memset(&sbi->layout.s_ods[1], 0,
|
|
size - sizeof(sbi->layout.s_ods[0]));
|
|
*psbi = sbi;
|
|
}
|
|
|
|
for (i = 0; i < numdevs; i++) {
|
|
struct exofs_fscb fscb;
|
|
struct osd_dev_info odi;
|
|
struct osd_dev *od;
|
|
|
|
if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) {
|
|
EXOFS_ERR("ERROR: Read all-zeros device entry\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n",
|
|
i, odi.osdname);
|
|
|
|
/* On all devices the device table is identical. The user can
|
|
* specify any one of the participating devices on the command
|
|
* line. We always keep them in device-table order.
|
|
*/
|
|
if (fscb_od && osduld_device_same(fscb_od, &odi)) {
|
|
sbi->layout.s_ods[i] = fscb_od;
|
|
++sbi->layout.s_numdevs;
|
|
fscb_od = NULL;
|
|
continue;
|
|
}
|
|
|
|
od = osduld_info_lookup(&odi);
|
|
if (unlikely(IS_ERR(od))) {
|
|
ret = PTR_ERR(od);
|
|
EXOFS_ERR("ERROR: device requested is not found "
|
|
"osd_name-%s =>%d\n", odi.osdname, ret);
|
|
goto out;
|
|
}
|
|
|
|
sbi->layout.s_ods[i] = od;
|
|
++sbi->layout.s_numdevs;
|
|
|
|
/* Read the fscb of the other devices to make sure the FS
|
|
* partition is there.
|
|
*/
|
|
ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb,
|
|
sizeof(fscb));
|
|
if (unlikely(ret)) {
|
|
EXOFS_ERR("ERROR: Malformed participating device "
|
|
"error reading fscb osd_name-%s\n",
|
|
odi.osdname);
|
|
goto out;
|
|
}
|
|
|
|
/* TODO: verify other information is correct and FS-uuid
|
|
* matches. Benny what did you say about device table
|
|
* generation and old devices?
|
|
*/
|
|
}
|
|
|
|
out:
|
|
kfree(dt);
|
|
if (unlikely(!ret && fscb_od)) {
|
|
EXOFS_ERR(
|
|
"ERROR: Bad device-table container device not present\n");
|
|
osduld_put_device(fscb_od);
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Read the superblock from the OSD and fill in the fields
|
|
*/
|
|
static int exofs_fill_super(struct super_block *sb, void *data, int silent)
|
|
{
|
|
struct inode *root;
|
|
struct exofs_mountopt *opts = data;
|
|
struct exofs_sb_info *sbi; /*extended info */
|
|
struct osd_dev *od; /* Master device */
|
|
struct exofs_fscb fscb; /*on-disk superblock info */
|
|
struct osd_obj_id obj;
|
|
unsigned table_count;
|
|
int ret;
|
|
|
|
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
|
if (!sbi)
|
|
return -ENOMEM;
|
|
|
|
ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY);
|
|
if (ret)
|
|
goto free_bdi;
|
|
|
|
/* use mount options to fill superblock */
|
|
od = osduld_path_lookup(opts->dev_name);
|
|
if (IS_ERR(od)) {
|
|
ret = PTR_ERR(od);
|
|
goto free_sbi;
|
|
}
|
|
|
|
/* Default layout in case we do not have a device-table */
|
|
sbi->layout.stripe_unit = PAGE_SIZE;
|
|
sbi->layout.mirrors_p1 = 1;
|
|
sbi->layout.group_width = 1;
|
|
sbi->layout.group_depth = -1;
|
|
sbi->layout.group_count = 1;
|
|
sbi->layout.s_ods[0] = od;
|
|
sbi->layout.s_numdevs = 1;
|
|
sbi->layout.s_pid = opts->pid;
|
|
sbi->s_timeout = opts->timeout;
|
|
|
|
/* fill in some other data by hand */
|
|
memset(sb->s_id, 0, sizeof(sb->s_id));
|
|
strcpy(sb->s_id, "exofs");
|
|
sb->s_blocksize = EXOFS_BLKSIZE;
|
|
sb->s_blocksize_bits = EXOFS_BLKSHIFT;
|
|
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
|
atomic_set(&sbi->s_curr_pending, 0);
|
|
sb->s_bdev = NULL;
|
|
sb->s_dev = 0;
|
|
|
|
obj.partition = sbi->layout.s_pid;
|
|
obj.id = EXOFS_SUPER_ID;
|
|
exofs_make_credential(sbi->s_cred, &obj);
|
|
|
|
ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb));
|
|
if (unlikely(ret))
|
|
goto free_sbi;
|
|
|
|
sb->s_magic = le16_to_cpu(fscb.s_magic);
|
|
sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
|
|
sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
|
|
|
|
/* make sure what we read from the object store is correct */
|
|
if (sb->s_magic != EXOFS_SUPER_MAGIC) {
|
|
if (!silent)
|
|
EXOFS_ERR("ERROR: Bad magic value\n");
|
|
ret = -EINVAL;
|
|
goto free_sbi;
|
|
}
|
|
if (le32_to_cpu(fscb.s_version) != EXOFS_FSCB_VER) {
|
|
EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n",
|
|
EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version));
|
|
ret = -EINVAL;
|
|
goto free_sbi;
|
|
}
|
|
|
|
/* start generation numbers from a random point */
|
|
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
|
spin_lock_init(&sbi->s_next_gen_lock);
|
|
|
|
table_count = le64_to_cpu(fscb.s_dev_table_count);
|
|
if (table_count) {
|
|
ret = exofs_read_lookup_dev_table(&sbi, table_count);
|
|
if (unlikely(ret))
|
|
goto free_sbi;
|
|
}
|
|
|
|
/* set up operation vectors */
|
|
sb->s_bdi = &sbi->bdi;
|
|
sb->s_fs_info = sbi;
|
|
sb->s_op = &exofs_sops;
|
|
sb->s_export_op = &exofs_export_ops;
|
|
root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
|
|
if (IS_ERR(root)) {
|
|
EXOFS_ERR("ERROR: exofs_iget failed\n");
|
|
ret = PTR_ERR(root);
|
|
goto free_sbi;
|
|
}
|
|
sb->s_root = d_alloc_root(root);
|
|
if (!sb->s_root) {
|
|
iput(root);
|
|
EXOFS_ERR("ERROR: get root inode failed\n");
|
|
ret = -ENOMEM;
|
|
goto free_sbi;
|
|
}
|
|
|
|
if (!S_ISDIR(root->i_mode)) {
|
|
dput(sb->s_root);
|
|
sb->s_root = NULL;
|
|
EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
|
|
root->i_mode);
|
|
ret = -EINVAL;
|
|
goto free_sbi;
|
|
}
|
|
|
|
_exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0],
|
|
sbi->layout.s_pid);
|
|
return 0;
|
|
|
|
free_sbi:
|
|
bdi_destroy(&sbi->bdi);
|
|
free_bdi:
|
|
EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n",
|
|
opts->dev_name, sbi->layout.s_pid, ret);
|
|
exofs_free_sbi(sbi);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Set up the superblock (calls exofs_fill_super eventually)
|
|
*/
|
|
static struct dentry *exofs_mount(struct file_system_type *type,
|
|
int flags, const char *dev_name,
|
|
void *data)
|
|
{
|
|
struct exofs_mountopt opts;
|
|
int ret;
|
|
|
|
ret = parse_options(data, &opts);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
opts.dev_name = dev_name;
|
|
return mount_nodev(type, flags, &opts, exofs_fill_super);
|
|
}
|
|
|
|
/*
|
|
* Return information about the file system state in the buffer. This is used
|
|
* by the 'df' command, for example.
|
|
*/
|
|
static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct super_block *sb = dentry->d_sb;
|
|
struct exofs_sb_info *sbi = sb->s_fs_info;
|
|
struct exofs_io_state *ios;
|
|
struct osd_attr attrs[] = {
|
|
ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
|
|
OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
|
|
ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
|
|
OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
|
|
};
|
|
uint64_t capacity = ULLONG_MAX;
|
|
uint64_t used = ULLONG_MAX;
|
|
uint8_t cred_a[OSD_CAP_LEN];
|
|
int ret;
|
|
|
|
ret = exofs_get_io_state(&sbi->layout, &ios);
|
|
if (ret) {
|
|
EXOFS_DBGMSG("exofs_get_io_state failed.\n");
|
|
return ret;
|
|
}
|
|
|
|
exofs_make_credential(cred_a, &ios->obj);
|
|
ios->cred = sbi->s_cred;
|
|
ios->in_attr = attrs;
|
|
ios->in_attr_len = ARRAY_SIZE(attrs);
|
|
|
|
ret = exofs_sbi_read(ios);
|
|
if (unlikely(ret))
|
|
goto out;
|
|
|
|
ret = extract_attr_from_ios(ios, &attrs[0]);
|
|
if (likely(!ret)) {
|
|
capacity = get_unaligned_be64(attrs[0].val_ptr);
|
|
if (unlikely(!capacity))
|
|
capacity = ULLONG_MAX;
|
|
} else
|
|
EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
|
|
|
|
ret = extract_attr_from_ios(ios, &attrs[1]);
|
|
if (likely(!ret))
|
|
used = get_unaligned_be64(attrs[1].val_ptr);
|
|
else
|
|
EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
|
|
|
|
/* fill in the stats buffer */
|
|
buf->f_type = EXOFS_SUPER_MAGIC;
|
|
buf->f_bsize = EXOFS_BLKSIZE;
|
|
buf->f_blocks = capacity >> 9;
|
|
buf->f_bfree = (capacity - used) >> 9;
|
|
buf->f_bavail = buf->f_bfree;
|
|
buf->f_files = sbi->s_numfiles;
|
|
buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
|
|
buf->f_namelen = EXOFS_NAME_LEN;
|
|
|
|
out:
|
|
exofs_put_io_state(ios);
|
|
return ret;
|
|
}
|
|
|
|
static const struct super_operations exofs_sops = {
|
|
.alloc_inode = exofs_alloc_inode,
|
|
.destroy_inode = exofs_destroy_inode,
|
|
.write_inode = exofs_write_inode,
|
|
.evict_inode = exofs_evict_inode,
|
|
.put_super = exofs_put_super,
|
|
.write_super = exofs_write_super,
|
|
.sync_fs = exofs_sync_fs,
|
|
.statfs = exofs_statfs,
|
|
};
|
|
|
|
/******************************************************************************
|
|
* EXPORT OPERATIONS
|
|
*****************************************************************************/
|
|
|
|
struct dentry *exofs_get_parent(struct dentry *child)
|
|
{
|
|
unsigned long ino = exofs_parent_ino(child);
|
|
|
|
if (!ino)
|
|
return NULL;
|
|
|
|
return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
|
|
}
|
|
|
|
static struct inode *exofs_nfs_get_inode(struct super_block *sb,
|
|
u64 ino, u32 generation)
|
|
{
|
|
struct inode *inode;
|
|
|
|
inode = exofs_iget(sb, ino);
|
|
if (IS_ERR(inode))
|
|
return ERR_CAST(inode);
|
|
if (generation && inode->i_generation != generation) {
|
|
/* we didn't find the right inode.. */
|
|
iput(inode);
|
|
return ERR_PTR(-ESTALE);
|
|
}
|
|
return inode;
|
|
}
|
|
|
|
static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
|
exofs_nfs_get_inode);
|
|
}
|
|
|
|
static struct dentry *exofs_fh_to_parent(struct super_block *sb,
|
|
struct fid *fid, int fh_len, int fh_type)
|
|
{
|
|
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
|
exofs_nfs_get_inode);
|
|
}
|
|
|
|
static const struct export_operations exofs_export_ops = {
|
|
.fh_to_dentry = exofs_fh_to_dentry,
|
|
.fh_to_parent = exofs_fh_to_parent,
|
|
.get_parent = exofs_get_parent,
|
|
};
|
|
|
|
/******************************************************************************
|
|
* INSMOD/RMMOD
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* struct that describes this file system
|
|
*/
|
|
static struct file_system_type exofs_type = {
|
|
.owner = THIS_MODULE,
|
|
.name = "exofs",
|
|
.mount = exofs_mount,
|
|
.kill_sb = generic_shutdown_super,
|
|
};
|
|
|
|
static int __init init_exofs(void)
|
|
{
|
|
int err;
|
|
|
|
err = init_inodecache();
|
|
if (err)
|
|
goto out;
|
|
|
|
err = register_filesystem(&exofs_type);
|
|
if (err)
|
|
goto out_d;
|
|
|
|
return 0;
|
|
out_d:
|
|
destroy_inodecache();
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void __exit exit_exofs(void)
|
|
{
|
|
unregister_filesystem(&exofs_type);
|
|
destroy_inodecache();
|
|
}
|
|
|
|
MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
|
|
MODULE_DESCRIPTION("exofs");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(init_exofs)
|
|
module_exit(exit_exofs)
|