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authorBoaz Harrosh <bharrosh@panasas.com>2008-10-27 12:27:55 -0400
committerBoaz Harrosh <bharrosh@panasas.com>2009-03-31 12:44:20 -0400
commitb14f8ab2844987f013253dd04b708bde7fc1b52d (patch)
tree52af3569943e17a29d4ed08d2df37211d8dc7ea8 /fs
parent15f7176eb1cccec0a332541285ee752b935c1c85 (diff)
exofs: Kbuild, Headers and osd utils
This patch includes osd infrastructure that will be used later by the file system. Also the declarations of constants, on disk structures, and prototypes. And the Kbuild+Kconfig files needed to build the exofs module. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/exofs/Kbuild16
-rw-r--r--fs/exofs/Kconfig13
-rw-r--r--fs/exofs/common.h184
-rw-r--r--fs/exofs/exofs.h127
-rw-r--r--fs/exofs/osd.c153
5 files changed, 493 insertions, 0 deletions
diff --git a/fs/exofs/Kbuild b/fs/exofs/Kbuild
new file mode 100644
index 000000000000..36d23ca79a58
--- /dev/null
+++ b/fs/exofs/Kbuild
@@ -0,0 +1,16 @@
1#
2# Kbuild for the EXOFS module
3#
4# Copyright (C) 2008 Panasas Inc. All rights reserved.
5#
6# Authors:
7# Boaz Harrosh <bharrosh@panasas.com>
8#
9# This program is free software; you can redistribute it and/or modify
10# it under the terms of the GNU General Public License version 2
11#
12# Kbuild - Gets included from the Kernels Makefile and build system
13#
14
15exofs-y := osd.o
16obj-$(CONFIG_EXOFS_FS) += exofs.o
diff --git a/fs/exofs/Kconfig b/fs/exofs/Kconfig
new file mode 100644
index 000000000000..86194b2f799d
--- /dev/null
+++ b/fs/exofs/Kconfig
@@ -0,0 +1,13 @@
1config EXOFS_FS
2 tristate "exofs: OSD based file system support"
3 depends on SCSI_OSD_ULD
4 help
5 EXOFS is a file system that uses an OSD storage device,
6 as its backing storage.
7
8# Debugging-related stuff
9config EXOFS_DEBUG
10 bool "Enable debugging"
11 depends on EXOFS_FS
12 help
13 This option enables EXOFS debug prints.
diff --git a/fs/exofs/common.h b/fs/exofs/common.h
new file mode 100644
index 000000000000..b1512c4bb8c7
--- /dev/null
+++ b/fs/exofs/common.h
@@ -0,0 +1,184 @@
1/*
2 * common.h - Common definitions for both Kernel and user-mode utilities
3 *
4 * Copyright (C) 2005, 2006
5 * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
6 * Copyright (C) 2005, 2006
7 * International Business Machines
8 * Copyright (C) 2008, 2009
9 * Boaz Harrosh <bharrosh@panasas.com>
10 *
11 * Copyrights for code taken from ext2:
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
16 * from
17 * linux/fs/minix/inode.c
18 * Copyright (C) 1991, 1992 Linus Torvalds
19 *
20 * This file is part of exofs.
21 *
22 * exofs is free software; you can redistribute it and/or modify
23 * it under the terms of the GNU General Public License as published by
24 * the Free Software Foundation. Since it is based on ext2, and the only
25 * valid version of GPL for the Linux kernel is version 2, the only valid
26 * version of GPL for exofs is version 2.
27 *
28 * exofs is distributed in the hope that it will be useful,
29 * but WITHOUT ANY WARRANTY; without even the implied warranty of
30 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
31 * GNU General Public License for more details.
32 *
33 * You should have received a copy of the GNU General Public License
34 * along with exofs; if not, write to the Free Software
35 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
36 */
37
38#ifndef __EXOFS_COM_H__
39#define __EXOFS_COM_H__
40
41#include <linux/types.h>
42
43#include <scsi/osd_attributes.h>
44#include <scsi/osd_initiator.h>
45#include <scsi/osd_sec.h>
46
47/****************************************************************************
48 * Object ID related defines
49 * NOTE: inode# = object ID - EXOFS_OBJ_OFF
50 ****************************************************************************/
51#define EXOFS_MIN_PID 0x10000 /* Smallest partition ID */
52#define EXOFS_OBJ_OFF 0x10000 /* offset for objects */
53#define EXOFS_SUPER_ID 0x10000 /* object ID for on-disk superblock */
54#define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */
55
56/* exofs Application specific page/attribute */
57# define EXOFS_APAGE_FS_DATA (OSD_APAGE_APP_DEFINED_FIRST + 3)
58# define EXOFS_ATTR_INODE_DATA 1
59
60/*
61 * The maximum number of files we can have is limited by the size of the
62 * inode number. This is the largest object ID that the file system supports.
63 * Object IDs 0, 1, and 2 are always in use (see above defines).
64 */
65enum {
66 EXOFS_MAX_INO_ID = (sizeof(ino_t) * 8 == 64) ? ULLONG_MAX :
67 (1ULL << (sizeof(ino_t) * 8ULL - 1ULL)),
68 EXOFS_MAX_ID = (EXOFS_MAX_INO_ID - 1 - EXOFS_OBJ_OFF),
69};
70
71/****************************************************************************
72 * Misc.
73 ****************************************************************************/
74#define EXOFS_BLKSHIFT 12
75#define EXOFS_BLKSIZE (1UL << EXOFS_BLKSHIFT)
76
77/****************************************************************************
78 * superblock-related things
79 ****************************************************************************/
80#define EXOFS_SUPER_MAGIC 0x5DF5
81
82/*
83 * The file system control block - stored in an object's data (mainly, the one
84 * with ID EXOFS_SUPER_ID). This is where the in-memory superblock is stored
85 * on disk. Right now it just has a magic value, which is basically a sanity
86 * check on our ability to communicate with the object store.
87 */
88struct exofs_fscb {
89 __le64 s_nextid; /* Highest object ID used */
90 __le32 s_numfiles; /* Number of files on fs */
91 __le16 s_magic; /* Magic signature */
92 __le16 s_newfs; /* Non-zero if this is a new fs */
93};
94
95/****************************************************************************
96 * inode-related things
97 ****************************************************************************/
98#define EXOFS_IDATA 5
99
100/*
101 * The file control block - stored in an object's attributes. This is where
102 * the in-memory inode is stored on disk.
103 */
104struct exofs_fcb {
105 __le64 i_size; /* Size of the file */
106 __le16 i_mode; /* File mode */
107 __le16 i_links_count; /* Links count */
108 __le32 i_uid; /* Owner Uid */
109 __le32 i_gid; /* Group Id */
110 __le32 i_atime; /* Access time */
111 __le32 i_ctime; /* Creation time */
112 __le32 i_mtime; /* Modification time */
113 __le32 i_flags; /* File flags (unused for now)*/
114 __le32 i_generation; /* File version (for NFS) */
115 __le32 i_data[EXOFS_IDATA]; /* Short symlink names and device #s */
116};
117
118#define EXOFS_INO_ATTR_SIZE sizeof(struct exofs_fcb)
119
120/* This is the Attribute the fcb is stored in */
121static const struct __weak osd_attr g_attr_inode_data = ATTR_DEF(
122 EXOFS_APAGE_FS_DATA,
123 EXOFS_ATTR_INODE_DATA,
124 EXOFS_INO_ATTR_SIZE);
125
126/****************************************************************************
127 * dentry-related things
128 ****************************************************************************/
129#define EXOFS_NAME_LEN 255
130
131/*
132 * The on-disk directory entry
133 */
134struct exofs_dir_entry {
135 __le64 inode_no; /* inode number */
136 __le16 rec_len; /* directory entry length */
137 u8 name_len; /* name length */
138 u8 file_type; /* umm...file type */
139 char name[EXOFS_NAME_LEN]; /* file name */
140};
141
142enum {
143 EXOFS_FT_UNKNOWN,
144 EXOFS_FT_REG_FILE,
145 EXOFS_FT_DIR,
146 EXOFS_FT_CHRDEV,
147 EXOFS_FT_BLKDEV,
148 EXOFS_FT_FIFO,
149 EXOFS_FT_SOCK,
150 EXOFS_FT_SYMLINK,
151 EXOFS_FT_MAX
152};
153
154#define EXOFS_DIR_PAD 4
155#define EXOFS_DIR_ROUND (EXOFS_DIR_PAD - 1)
156#define EXOFS_DIR_REC_LEN(name_len) \
157 (((name_len) + offsetof(struct exofs_dir_entry, name) + \
158 EXOFS_DIR_ROUND) & ~EXOFS_DIR_ROUND)
159
160/*************************
161 * function declarations *
162 *************************/
163/* osd.c */
164void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
165 const struct osd_obj_id *obj);
166
167int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid);
168static inline int exofs_check_ok(struct osd_request *or)
169{
170 return exofs_check_ok_resid(or, NULL, NULL);
171}
172int exofs_sync_op(struct osd_request *or, int timeout, u8 *cred);
173int exofs_async_op(struct osd_request *or,
174 osd_req_done_fn *async_done, void *caller_context, u8 *cred);
175
176int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr);
177
178int osd_req_read_kern(struct osd_request *or,
179 const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
180
181int osd_req_write_kern(struct osd_request *or,
182 const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
183
184#endif /*ifndef __EXOFS_COM_H__*/
diff --git a/fs/exofs/exofs.h b/fs/exofs/exofs.h
new file mode 100644
index 000000000000..365376d3f72d
--- /dev/null
+++ b/fs/exofs/exofs.h
@@ -0,0 +1,127 @@
1/*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
4 * Copyright (C) 2005, 2006
5 * International Business Machines
6 * Copyright (C) 2008, 2009
7 * Boaz Harrosh <bharrosh@panasas.com>
8 *
9 * Copyrights for code taken from ext2:
10 * Copyright (C) 1992, 1993, 1994, 1995
11 * Remy Card (card@masi.ibp.fr)
12 * Laboratoire MASI - Institut Blaise Pascal
13 * Universite Pierre et Marie Curie (Paris VI)
14 * from
15 * linux/fs/minix/inode.c
16 * Copyright (C) 1991, 1992 Linus Torvalds
17 *
18 * This file is part of exofs.
19 *
20 * exofs is free software; you can redistribute it and/or modify
21 * it under the terms of the GNU General Public License as published by
22 * the Free Software Foundation. Since it is based on ext2, and the only
23 * valid version of GPL for the Linux kernel is version 2, the only valid
24 * version of GPL for exofs is version 2.
25 *
26 * exofs is distributed in the hope that it will be useful,
27 * but WITHOUT ANY WARRANTY; without even the implied warranty of
28 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
29 * GNU General Public License for more details.
30 *
31 * You should have received a copy of the GNU General Public License
32 * along with exofs; if not, write to the Free Software
33 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
34 */
35
36#include <linux/fs.h>
37#include <linux/time.h>
38#include "common.h"
39
40#ifndef __EXOFS_H__
41#define __EXOFS_H__
42
43#define EXOFS_ERR(fmt, a...) printk(KERN_ERR "exofs: " fmt, ##a)
44
45#ifdef CONFIG_EXOFS_DEBUG
46#define EXOFS_DBGMSG(fmt, a...) \
47 printk(KERN_NOTICE "exofs @%s:%d: " fmt, __func__, __LINE__, ##a)
48#else
49#define EXOFS_DBGMSG(fmt, a...) \
50 do { if (0) printk(fmt, ##a); } while (0)
51#endif
52
53/* u64 has problems with printk this will cast it to unsigned long long */
54#define _LLU(x) (unsigned long long)(x)
55
56/*
57 * our extension to the in-memory superblock
58 */
59struct exofs_sb_info {
60 struct osd_dev *s_dev; /* returned by get_osd_dev */
61 osd_id s_pid; /* partition ID of file system*/
62 int s_timeout; /* timeout for OSD operations */
63 uint64_t s_nextid; /* highest object ID used */
64 uint32_t s_numfiles; /* number of files on fs */
65 spinlock_t s_next_gen_lock; /* spinlock for gen # update */
66 u32 s_next_generation; /* next gen # to use */
67 atomic_t s_curr_pending; /* number of pending commands */
68 uint8_t s_cred[OSD_CAP_LEN]; /* all-powerful credential */
69};
70
71/*
72 * our extension to the in-memory inode
73 */
74struct exofs_i_info {
75 unsigned long i_flags; /* various atomic flags */
76 uint32_t i_data[EXOFS_IDATA];/*short symlink names and device #s*/
77 uint32_t i_dir_start_lookup; /* which page to start lookup */
78 wait_queue_head_t i_wq; /* wait queue for inode */
79 uint64_t i_commit_size; /* the object's written length */
80 uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
81 struct inode vfs_inode; /* normal in-memory inode */
82};
83
84/*
85 * our inode flags
86 */
87#define OBJ_2BCREATED 0 /* object will be created soon*/
88#define OBJ_CREATED 1 /* object has been created on the osd*/
89
90static inline int obj_2bcreated(struct exofs_i_info *oi)
91{
92 return test_bit(OBJ_2BCREATED, &oi->i_flags);
93}
94
95static inline void set_obj_2bcreated(struct exofs_i_info *oi)
96{
97 set_bit(OBJ_2BCREATED, &oi->i_flags);
98}
99
100static inline int obj_created(struct exofs_i_info *oi)
101{
102 return test_bit(OBJ_CREATED, &oi->i_flags);
103}
104
105static inline void set_obj_created(struct exofs_i_info *oi)
106{
107 set_bit(OBJ_CREATED, &oi->i_flags);
108}
109
110int __exofs_wait_obj_created(struct exofs_i_info *oi);
111static inline int wait_obj_created(struct exofs_i_info *oi)
112{
113 if (likely(obj_created(oi)))
114 return 0;
115
116 return __exofs_wait_obj_created(oi);
117}
118
119/*
120 * get to our inode from the vfs inode
121 */
122static inline struct exofs_i_info *exofs_i(struct inode *inode)
123{
124 return container_of(inode, struct exofs_i_info, vfs_inode);
125}
126
127#endif
diff --git a/fs/exofs/osd.c b/fs/exofs/osd.c
new file mode 100644
index 000000000000..b249ae97fb15
--- /dev/null
+++ b/fs/exofs/osd.c
@@ -0,0 +1,153 @@
1/*
2 * Copyright (C) 2005, 2006
3 * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
4 * Copyright (C) 2005, 2006
5 * International Business Machines
6 * Copyright (C) 2008, 2009
7 * Boaz Harrosh <bharrosh@panasas.com>
8 *
9 * This file is part of exofs.
10 *
11 * exofs is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation. Since it is based on ext2, and the only
14 * valid version of GPL for the Linux kernel is version 2, the only valid
15 * version of GPL for exofs is version 2.
16 *
17 * exofs is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with exofs; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
25 */
26
27#include <scsi/scsi_device.h>
28#include <scsi/osd_sense.h>
29
30#include "exofs.h"
31
32int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
33{
34 struct osd_sense_info osi;
35 int ret = osd_req_decode_sense(or, &osi);
36
37 if (ret) { /* translate to Linux codes */
38 if (osi.additional_code == scsi_invalid_field_in_cdb) {
39 if (osi.cdb_field_offset == OSD_CFO_STARTING_BYTE)
40 ret = -EFAULT;
41 if (osi.cdb_field_offset == OSD_CFO_OBJECT_ID)
42 ret = -ENOENT;
43 else
44 ret = -EINVAL;
45 } else if (osi.additional_code == osd_quota_error)
46 ret = -ENOSPC;
47 else
48 ret = -EIO;
49 }
50
51 /* FIXME: should be include in osd_sense_info */
52 if (in_resid)
53 *in_resid = or->in.req ? or->in.req->data_len : 0;
54
55 if (out_resid)
56 *out_resid = or->out.req ? or->out.req->data_len : 0;
57
58 return ret;
59}
60
61void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
62{
63 osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
64}
65
66/*
67 * Perform a synchronous OSD operation.
68 */
69int exofs_sync_op(struct osd_request *or, int timeout, uint8_t *credential)
70{
71 int ret;
72
73 or->timeout = timeout;
74 ret = osd_finalize_request(or, 0, credential, NULL);
75 if (ret) {
76 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
77 return ret;
78 }
79
80 ret = osd_execute_request(or);
81
82 if (ret)
83 EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
84 /* osd_req_decode_sense(or, ret); */
85 return ret;
86}
87
88/*
89 * Perform an asynchronous OSD operation.
90 */
91int exofs_async_op(struct osd_request *or, osd_req_done_fn *async_done,
92 void *caller_context, u8 *cred)
93{
94 int ret;
95
96 ret = osd_finalize_request(or, 0, cred, NULL);
97 if (ret) {
98 EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
99 return ret;
100 }
101
102 ret = osd_execute_request_async(or, async_done, caller_context);
103
104 if (ret)
105 EXOFS_DBGMSG("osd_execute_request_async() => %d\n", ret);
106 return ret;
107}
108
109int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr)
110{
111 struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
112 void *iter = NULL;
113 int nelem;
114
115 do {
116 nelem = 1;
117 osd_req_decode_get_attr_list(or, &cur_attr, &nelem, &iter);
118 if ((cur_attr.attr_page == attr->attr_page) &&
119 (cur_attr.attr_id == attr->attr_id)) {
120 attr->len = cur_attr.len;
121 attr->val_ptr = cur_attr.val_ptr;
122 return 0;
123 }
124 } while (iter);
125
126 return -EIO;
127}
128
129int osd_req_read_kern(struct osd_request *or,
130 const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
131{
132 struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
133 struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
134
135 if (!bio)
136 return -ENOMEM;
137
138 osd_req_read(or, obj, bio, offset);
139 return 0;
140}
141
142int osd_req_write_kern(struct osd_request *or,
143 const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
144{
145 struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
146 struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
147
148 if (!bio)
149 return -ENOMEM;
150
151 osd_req_write(or, obj, bio, offset);
152 return 0;
153}
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