/* * Copyright (C) 2005, 2006 * Avishay Traeger (avishay@gmail.com) * Copyright (C) 2008, 2009 * Boaz Harrosh * * Copyrights for code taken from ext2: * Copyright (C) 1992, 1993, 1994, 1995 * Remy Card (card@masi.ibp.fr) * Laboratoire MASI - Institut Blaise Pascal * Universite Pierre et Marie Curie (Paris VI) * from * linux/fs/minix/inode.c * Copyright (C) 1991, 1992 Linus Torvalds * * This file is part of exofs. * * exofs is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation. Since it is based on ext2, and the only * valid version of GPL for the Linux kernel is version 2, the only valid * version of GPL for exofs is version 2. * * exofs is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with exofs; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef __EXOFS_H__ #define __EXOFS_H__ #include #include #include #include #include "common.h" #define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a) #ifdef CONFIG_EXOFS_DEBUG #define EXOFS_DBGMSG(fmt, a...) \ printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a) #else #define EXOFS_DBGMSG(fmt, a...) \ do { if (0) printk(fmt, ##a); } while (0) #endif /* u64 has problems with printk this will cast it to unsigned long long */ #define _LLU(x) (unsigned long long)(x) struct exofs_dev { struct ore_dev ored; unsigned did; unsigned urilen; uint8_t *uri; struct kobject ed_kobj; }; /* * our extension to the in-memory superblock */ struct exofs_sb_info { struct backing_dev_info bdi; /* register our bdi with VFS */ struct exofs_sb_stats s_ess; /* Written often, pre-allocate*/ int s_timeout; /* timeout for OSD operations */ uint64_t s_nextid; /* highest object ID used */ uint32_t s_numfiles; /* number of files on fs */ spinlock_t s_next_gen_lock; /* spinlock for gen # update */ u32 s_next_generation; /* next gen # to use */ atomic_t s_curr_pending; /* number of pending commands */ struct ore_layout layout; /* Default files layout */ struct ore_comp one_comp; /* id & cred of partition id=0*/ struct ore_components oc; /* comps for the partition */ struct kobject s_kobj; /* holds per-sbi kobject */ }; /* * our extension to the in-memory inode */ struct exofs_i_info { struct inode vfs_inode; /* normal in-memory inode */ wait_queue_head_t i_wq; /* wait queue for inode */ unsigned long i_flags; /* various atomic flags */ uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/ uint32_t i_dir_start_lookup; /* which page to start lookup */ uint64_t i_commit_size; /* the object's written length */ struct ore_comp one_comp; /* same component for all devices */ struct ore_components oc; /* inode view of the device table */ }; static inline osd_id exofs_oi_objno(struct exofs_i_info *oi) { return oi->vfs_inode.i_ino + EXOFS_OBJ_OFF; } /* * our inode flags */ #define OBJ_2BCREATED 0 /* object will be created soon*/ #define OBJ_CREATED 1 /* object has been created on the osd*/ static inline int obj_2bcreated(struct exofs_i_info *oi) { return test_bit(OBJ_2BCREATED, &oi->i_flags); } static inline void set_obj_2bcreated(struct exofs_i_info *oi) { set_bit(OBJ_2BCREATED, &oi->i_flags); } static inline int obj_created(struct exofs_i_info *oi) { return test_bit(OBJ_CREATED, &oi->i_flags); } static inline void set_obj_created(struct exofs_i_info *oi) { set_bit(OBJ_CREATED, &oi->i_flags); } int __exofs_wait_obj_created(struct exofs_i_info *oi); static inline int wait_obj_created(struct exofs_i_info *oi) { if (likely(obj_created(oi))) return 0; return __exofs_wait_obj_created(oi); } /* * get to our inode from the vfs inode */ static inline struct exofs_i_info *exofs_i(struct inode *inode) { return container_of(inode, struct exofs_i_info, vfs_inode); } /* * Maximum count of links to a file */ #define EXOFS_LINK_MAX 32000 /************************* * function declarations * *************************/ /* inode.c */ unsigned exofs_max_io_pages(struct ore_layout *layout, unsigned expected_pages); int exofs_setattr(struct dentry *, struct iattr *); int exofs_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata); extern struct inode *exofs_iget(struct super_block *, unsigned long); struct inode *exofs_new_inode(struct inode *, umode_t); extern int exofs_write_inode(struct inode *, struct writeback_control *wbc); extern void exofs_evict_inode(struct inode *); /* dir.c: */ int exofs_add_link(struct dentry *, struct inode *); ino_t exofs_inode_by_name(struct inode *, struct dentry *); int exofs_delete_entry(struct exofs_dir_entry *, struct page *); int exofs_make_empty(struct inode *, struct inode *); struct exofs_dir_entry *exofs_find_entry(struct inode *, struct dentry *, struct page **); int exofs_empty_dir(struct inode *); struct exofs_dir_entry *exofs_dotdot(struct inode *, struct page **); ino_t exofs_parent_ino(struct dentry *child); int exofs_set_link(struct inode *, struct exofs_dir_entry *, struct page *, struct inode *); /* super.c */ void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj); int exofs_sbi_write_stats(struct exofs_sb_info *sbi); /* sys.c */ int exofs_sysfs_init(void); void exofs_sysfs_uninit(void); int exofs_sysfs_sb_add(struct exofs_sb_info *sbi, struct exofs_dt_device_info *dt_dev); void exofs_sysfs_sb_del(struct exofs_sb_info *sbi); int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi); void exofs_sysfs_dbg_print(void); /********************* * operation vectors * *********************/ /* dir.c: */ extern const struct file_operations exofs_dir_operations; /* file.c */ extern const struct inode_operations exofs_file_inode_operations; extern const struct file_operations exofs_file_operations; /* inode.c */ extern const struct address_space_operations exofs_aops; /* namei.c */ extern const struct inode_operations exofs_dir_inode_operations; extern const struct inode_operations exofs_special_inode_operations; /* symlink.c */ extern const struct inode_operations exofs_symlink_inode_operations; extern const struct inode_operations exofs_fast_symlink_inode_operations; /* exofs_init_comps will initialize an ore_components device array * pointing to a single ore_comp struct, and a round-robin view * of the device table. * The first device of each inode is the [inode->ino % num_devices] * and the rest of the devices sequentially following where the * first device is after the last device. * It is assumed that the global device array at @sbi is twice * bigger and that the device table repeats twice. * See: exofs_read_lookup_dev_table() */ static inline void exofs_init_comps(struct ore_components *oc, struct ore_comp *one_comp, struct exofs_sb_info *sbi, osd_id oid) { unsigned dev_mod = (unsigned)oid, first_dev; one_comp->obj.partition = sbi->one_comp.obj.partition; one_comp->obj.id = oid; exofs_make_credential(one_comp->cred, &one_comp->obj); oc->first_dev = 0; oc->numdevs = sbi->layout.group_width * sbi->layout.mirrors_p1 * sbi->layout.group_count; oc->single_comp = EC_SINGLE_COMP; oc->comps = one_comp; /* Round robin device view of the table */ first_dev = (dev_mod * sbi->layout.mirrors_p1) % sbi->oc.numdevs; oc->ods = &sbi->oc.ods[first_dev]; } #endif