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982980d753
Generic implementation of symlink ops. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
146 lines
4.5 KiB
C
146 lines
4.5 KiB
C
/*
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* Copyright (C) 2005, 2006
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* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
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* Copyright (C) 2005, 2006
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* International Business Machines
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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/fs.h>
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#include <linux/time.h>
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#include "common.h"
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#ifndef __EXOFS_H__
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#define __EXOFS_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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/*
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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 osd_dev *s_dev; /* returned by get_osd_dev */
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osd_id s_pid; /* partition ID of file system*/
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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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uint8_t s_cred[OSD_CAP_LEN]; /* all-powerful credential */
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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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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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wait_queue_head_t i_wq; /* wait queue for inode */
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uint64_t i_commit_size; /* the object's written length */
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uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
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struct inode vfs_inode; /* normal in-memory inode */
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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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* function declarations *
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*************************/
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/* inode.c */
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void exofs_truncate(struct inode *inode);
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int exofs_setattr(struct dentry *, struct iattr *);
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/*********************
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* operation vectors *
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*********************/
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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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/* 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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#endif
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