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245 lines
8.0 KiB
245 lines
8.0 KiB
/* |
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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 <ooo@electrozaur.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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unsigned urilen; |
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uint8_t *uri; |
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struct kobject ed_kobj; |
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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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struct kobject s_kobj; /* holds per-sbi kobject */ |
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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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/* sys.c */ |
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int exofs_sysfs_init(void); |
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void exofs_sysfs_uninit(void); |
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int exofs_sysfs_sb_add(struct exofs_sb_info *sbi, |
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struct exofs_dt_device_info *dt_dev); |
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void exofs_sysfs_sb_del(struct exofs_sb_info *sbi); |
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int exofs_sysfs_odev_add(struct exofs_dev *edev, |
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struct exofs_sb_info *sbi); |
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void exofs_sysfs_dbg_print(void); |
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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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