231 lines
7.5 KiB
C
231 lines
7.5 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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#ifndef __EXOFS_H__
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#define __EXOFS_H__
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/backing-dev.h>
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#include <scsi/osd_ore.h>
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#include "common.h"
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#define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
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#ifdef CONFIG_EXOFS_DEBUG
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#define EXOFS_DBGMSG(fmt, a...) \
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printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
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#else
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#define EXOFS_DBGMSG(fmt, a...) \
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do { if (0) printk(fmt, ##a); } while (0)
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#endif
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/* u64 has problems with printk this will cast it to unsigned long long */
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#define _LLU(x) (unsigned long long)(x)
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struct exofs_dev {
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struct ore_dev ored;
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unsigned did;
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};
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/*
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* our extension to the in-memory superblock
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*/
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struct exofs_sb_info {
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struct backing_dev_info bdi; /* register our bdi with VFS */
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struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/
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int s_timeout; /* timeout for OSD operations */
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uint64_t s_nextid; /* highest object ID used */
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uint32_t s_numfiles; /* number of files on fs */
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spinlock_t s_next_gen_lock; /* spinlock for gen # update */
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u32 s_next_generation; /* next gen # to use */
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atomic_t s_curr_pending; /* number of pending commands */
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struct ore_layout layout; /* Default files layout */
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struct ore_comp one_comp; /* id & cred of partition id=0*/
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struct ore_components oc; /* comps for the partition */
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};
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/*
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* our extension to the in-memory inode
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*/
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struct exofs_i_info {
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struct inode vfs_inode; /* normal in-memory inode */
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wait_queue_head_t i_wq; /* wait queue for inode */
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unsigned long i_flags; /* various atomic flags */
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uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
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uint32_t i_dir_start_lookup; /* which page to start lookup */
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uint64_t i_commit_size; /* the object's written length */
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struct ore_comp one_comp; /* same component for all devices */
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struct ore_components oc; /* inode view of the device table */
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};
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static inline osd_id exofs_oi_objno(struct exofs_i_info *oi)
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{
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return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF;
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}
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/*
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* our inode flags
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*/
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#define OBJ_2BCREATED 0 /* object will be created soon*/
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#define OBJ_CREATED 1 /* object has been created on the osd*/
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static inline int obj_2bcreated(struct exofs_i_info *oi)
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{
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return test_bit(OBJ_2BCREATED, &oi->i_flags);
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}
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static inline void set_obj_2bcreated(struct exofs_i_info *oi)
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{
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set_bit(OBJ_2BCREATED, &oi->i_flags);
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}
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static inline int obj_created(struct exofs_i_info *oi)
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{
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return test_bit(OBJ_CREATED, &oi->i_flags);
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}
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static inline void set_obj_created(struct exofs_i_info *oi)
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{
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set_bit(OBJ_CREATED, &oi->i_flags);
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}
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int __exofs_wait_obj_created(struct exofs_i_info *oi);
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static inline int wait_obj_created(struct exofs_i_info *oi)
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{
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if (likely(obj_created(oi)))
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return 0;
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return __exofs_wait_obj_created(oi);
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}
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/*
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* get to our inode from the vfs inode
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*/
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static inline struct exofs_i_info *exofs_i(struct inode *inode)
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{
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return container_of(inode, struct exofs_i_info, vfs_inode);
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}
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/*
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* Maximum count of links to a file
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*/
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#define EXOFS_LINK_MAX 32000
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/*************************
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* function declarations *
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*************************/
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/* inode.c */
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unsigned exofs_max_io_pages(struct ore_layout *layout,
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unsigned expected_pages);
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int exofs_setattr(struct dentry *, struct iattr *);
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int exofs_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata);
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extern struct inode *exofs_iget(struct super_block *, unsigned long);
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struct inode *exofs_new_inode(struct inode *, umode_t);
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extern int exofs_write_inode(struct inode *, struct writeback_control *wbc);
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extern void exofs_evict_inode(struct inode *);
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/* dir.c: */
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int exofs_add_link(struct dentry *, struct inode *);
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ino_t exofs_inode_by_name(struct inode *, struct dentry *);
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int exofs_delete_entry(struct exofs_dir_entry *, struct page *);
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int exofs_make_empty(struct inode *, struct inode *);
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struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *,
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struct page **);
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int exofs_empty_dir(struct inode *);
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struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **);
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ino_t exofs_parent_ino(struct dentry *child);
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int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *,
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struct inode *);
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/* super.c */
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void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
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const struct osd_obj_id *obj);
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int exofs_sbi_write_stats(struct exofs_sb_info *sbi);
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/*********************
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* operation vectors *
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*********************/
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/* dir.c: */
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extern const struct file_operations exofs_dir_operations;
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/* file.c */
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extern const struct inode_operations exofs_file_inode_operations;
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extern const struct file_operations exofs_file_operations;
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/* inode.c */
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extern const struct address_space_operations exofs_aops;
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/* namei.c */
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extern const struct inode_operations exofs_dir_inode_operations;
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extern const struct inode_operations exofs_special_inode_operations;
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/* symlink.c */
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extern const struct inode_operations exofs_symlink_inode_operations;
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extern const struct inode_operations exofs_fast_symlink_inode_operations;
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/* exofs_init_comps will initialize an ore_components device array
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* pointing to a single ore_comp struct, and a round-robin view
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* of the device table.
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* The first device of each inode is the [inode->ino % num_devices]
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* and the rest of the devices sequentially following where the
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* first device is after the last device.
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* It is assumed that the global device array at @sbi is twice
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* bigger and that the device table repeats twice.
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* See: exofs_read_lookup_dev_table()
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*/
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static inline void exofs_init_comps(struct ore_components *oc,
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struct ore_comp *one_comp,
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struct exofs_sb_info *sbi, osd_id oid)
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{
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unsigned dev_mod = (unsigned)oid, first_dev;
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one_comp->obj.partition = sbi->one_comp.obj.partition;
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one_comp->obj.id = oid;
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exofs_make_credential(one_comp->cred, &one_comp->obj);
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oc->first_dev = 0;
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oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 *
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sbi->layout.group_count;
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oc->single_comp = EC_SINGLE_COMP;
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oc->comps = one_comp;
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/* Round robin device view of the table */
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first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs;
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oc->ods = &sbi->oc.ods[first_dev];
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}
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#endif
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