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Merge branch 'for-linus' of git://git.open-osd.org/linux-open-osd
* 'for-linus' of git://git.open-osd.org/linux-open-osd: fs: Add exofs to Kernel build exofs: Documentation exofs: export_operations exofs: super_operations and file_system_type exofs: dir_inode and directory operations exofs: address_space_operations exofs: symlink_inode and fast_symlink_inode operations exofs: file and file_inode operations exofs: Kbuild, Headers and osd utils
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176
Documentation/filesystems/exofs.txt
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176
Documentation/filesystems/exofs.txt
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@ -0,0 +1,176 @@
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|||
===============================================================================
|
||||
WHAT IS EXOFS?
|
||||
===============================================================================
|
||||
|
||||
exofs is a file system that uses an OSD and exports the API of a normal Linux
|
||||
file system. Users access exofs like any other local file system, and exofs
|
||||
will in turn issue commands to the local OSD initiator.
|
||||
|
||||
OSD is a new T10 command set that views storage devices not as a large/flat
|
||||
array of sectors but as a container of objects, each having a length, quota,
|
||||
time attributes and more. Each object is addressed by a 64bit ID, and is
|
||||
contained in a 64bit ID partition. Each object has associated attributes
|
||||
attached to it, which are integral part of the object and provide metadata about
|
||||
the object. The standard defines some common obligatory attributes, but user
|
||||
attributes can be added as needed.
|
||||
|
||||
===============================================================================
|
||||
ENVIRONMENT
|
||||
===============================================================================
|
||||
|
||||
To use this file system, you need to have an object store to run it on. You
|
||||
may download a target from:
|
||||
http://open-osd.org
|
||||
|
||||
See Documentation/scsi/osd.txt for how to setup a working osd environment.
|
||||
|
||||
===============================================================================
|
||||
USAGE
|
||||
===============================================================================
|
||||
|
||||
1. Download and compile exofs and open-osd initiator:
|
||||
You need an external Kernel source tree or kernel headers from your
|
||||
distribution. (anything based on 2.6.26 or later).
|
||||
|
||||
a. download open-osd including exofs source using:
|
||||
[parent-directory]$ git clone git://git.open-osd.org/open-osd.git
|
||||
|
||||
b. Build the library module like this:
|
||||
[parent-directory]$ make -C KSRC=$(KER_DIR) open-osd
|
||||
|
||||
This will build both the open-osd initiator as well as the exofs kernel
|
||||
module. Use whatever parameters you compiled your Kernel with and
|
||||
$(KER_DIR) above pointing to the Kernel you compile against. See the file
|
||||
open-osd/top-level-Makefile for an example.
|
||||
|
||||
2. Get the OSD initiator and target set up properly, and login to the target.
|
||||
See Documentation/scsi/osd.txt for farther instructions. Also see ./do-osd
|
||||
for example script that does all these steps.
|
||||
|
||||
3. Insmod the exofs.ko module:
|
||||
[exofs]$ insmod exofs.ko
|
||||
|
||||
4. Make sure the directory where you want to mount exists. If not, create it.
|
||||
(For example, mkdir /mnt/exofs)
|
||||
|
||||
5. At first run you will need to invoke the mkfs.exofs application
|
||||
|
||||
As an example, this will create the file system on:
|
||||
/dev/osd0 partition ID 65536
|
||||
|
||||
mkfs.exofs --pid=65536 --format /dev/osd0
|
||||
|
||||
The --format is optional if not specified no OSD_FORMAT will be
|
||||
preformed and a clean file system will be created in the specified pid,
|
||||
in the available space of the target. (Use --format=size_in_meg to limit
|
||||
the total LUN space available)
|
||||
|
||||
If pid already exist it will be deleted and a new one will be created in it's
|
||||
place. Be careful.
|
||||
|
||||
An exofs lives inside a single OSD partition. You can create multiple exofs
|
||||
filesystems on the same device using multiple pids.
|
||||
|
||||
(run mkfs.exofs without any parameters for usage help message)
|
||||
|
||||
6. Mount the file system.
|
||||
|
||||
For example, to mount /dev/osd0, partition ID 0x10000 on /mnt/exofs:
|
||||
|
||||
mount -t exofs -o pid=65536 /dev/osd0 /mnt/exofs/
|
||||
|
||||
7. For reference (See do-exofs example script):
|
||||
do-exofs start - an example of how to perform the above steps.
|
||||
do-exofs stop - an example of how to unmount the file system.
|
||||
do-exofs format - an example of how to format and mkfs a new exofs.
|
||||
|
||||
8. Extra compilation flags (uncomment in fs/exofs/Kbuild):
|
||||
CONFIG_EXOFS_DEBUG - for debug messages and extra checks.
|
||||
|
||||
===============================================================================
|
||||
exofs mount options
|
||||
===============================================================================
|
||||
Similar to any mount command:
|
||||
mount -t exofs -o exofs_options /dev/osdX mount_exofs_directory
|
||||
|
||||
Where:
|
||||
-t exofs: specifies the exofs file system
|
||||
|
||||
/dev/osdX: X is a decimal number. /dev/osdX was created after a successful
|
||||
login into an OSD target.
|
||||
|
||||
mount_exofs_directory: The directory to mount the file system on
|
||||
|
||||
exofs specific options: Options are separated by commas (,)
|
||||
pid=<integer> - The partition number to mount/create as
|
||||
container of the filesystem.
|
||||
This option is mandatory
|
||||
to=<integer> - Timeout in ticks for a single command
|
||||
default is (60 * HZ) [for debugging only]
|
||||
|
||||
===============================================================================
|
||||
DESIGN
|
||||
===============================================================================
|
||||
|
||||
* The file system control block (AKA on-disk superblock) resides in an object
|
||||
with a special ID (defined in common.h).
|
||||
Information included in the file system control block is used to fill the
|
||||
in-memory superblock structure at mount time. This object is created before
|
||||
the file system is used by mkexofs.c It contains information such as:
|
||||
- The file system's magic number
|
||||
- The next inode number to be allocated
|
||||
|
||||
* Each file resides in its own object and contains the data (and it will be
|
||||
possible to extend the file over multiple objects, though this has not been
|
||||
implemented yet).
|
||||
|
||||
* A directory is treated as a file, and essentially contains a list of <file
|
||||
name, inode #> pairs for files that are found in that directory. The object
|
||||
IDs correspond to the files' inode numbers and will be allocated according to
|
||||
a bitmap (stored in a separate object). Now they are allocated using a
|
||||
counter.
|
||||
|
||||
* Each file's control block (AKA on-disk inode) is stored in its object's
|
||||
attributes. This applies to both regular files and other types (directories,
|
||||
device files, symlinks, etc.).
|
||||
|
||||
* Credentials are generated per object (inode and superblock) when they is
|
||||
created in memory (read off disk or created). The credential works for all
|
||||
operations and is used as long as the object remains in memory.
|
||||
|
||||
* Async OSD operations are used whenever possible, but the target may execute
|
||||
them out of order. The operations that concern us are create, delete,
|
||||
readpage, writepage, update_inode, and truncate. The following pairs of
|
||||
operations should execute in the order written, and we need to prevent them
|
||||
from executing in reverse order:
|
||||
- The following are handled with the OBJ_CREATED and OBJ_2BCREATED
|
||||
flags. OBJ_CREATED is set when we know the object exists on the OSD -
|
||||
in create's callback function, and when we successfully do a read_inode.
|
||||
OBJ_2BCREATED is set in the beginning of the create function, so we
|
||||
know that we should wait.
|
||||
- create/delete: delete should wait until the object is created
|
||||
on the OSD.
|
||||
- create/readpage: readpage should be able to return a page
|
||||
full of zeroes in this case. If there was a write already
|
||||
en-route (i.e. create, writepage, readpage) then the page
|
||||
would be locked, and so it would really be the same as
|
||||
create/writepage.
|
||||
- create/writepage: if writepage is called for a sync write, it
|
||||
should wait until the object is created on the OSD.
|
||||
Otherwise, it should just return.
|
||||
- create/truncate: truncate should wait until the object is
|
||||
created on the OSD.
|
||||
- create/update_inode: update_inode should wait until the
|
||||
object is created on the OSD.
|
||||
- Handled by VFS locks:
|
||||
- readpage/delete: shouldn't happen because of page lock.
|
||||
- writepage/delete: shouldn't happen because of page lock.
|
||||
- readpage/writepage: shouldn't happen because of page lock.
|
||||
|
||||
===============================================================================
|
||||
LICENSE/COPYRIGHT
|
||||
===============================================================================
|
||||
The exofs file system is based on ext2 v0.5b (distributed with the Linux kernel
|
||||
version 2.6.10). All files include the original copyrights, and the license
|
||||
is GPL version 2 (only version 2, as is true for the Linux kernel). The
|
||||
Linux kernel can be downloaded from www.kernel.org.
|
|
@ -169,6 +169,8 @@ source "fs/romfs/Kconfig"
|
|||
source "fs/sysv/Kconfig"
|
||||
source "fs/ufs/Kconfig"
|
||||
|
||||
source "fs/exofs/Kconfig"
|
||||
|
||||
endif # MISC_FILESYSTEMS
|
||||
|
||||
menuconfig NETWORK_FILESYSTEMS
|
||||
|
|
|
@ -120,3 +120,4 @@ obj-$(CONFIG_DEBUG_FS) += debugfs/
|
|||
obj-$(CONFIG_OCFS2_FS) += ocfs2/
|
||||
obj-$(CONFIG_BTRFS_FS) += btrfs/
|
||||
obj-$(CONFIG_GFS2_FS) += gfs2/
|
||||
obj-$(CONFIG_EXOFS_FS) += exofs/
|
||||
|
|
3
fs/exofs/BUGS
Normal file
3
fs/exofs/BUGS
Normal file
|
@ -0,0 +1,3 @@
|
|||
- Out-of-space may cause a severe problem if the object (and directory entry)
|
||||
were written, but the inode attributes failed. Then if the filesystem was
|
||||
unmounted and mounted the kernel can get into an endless loop doing a readdir.
|
16
fs/exofs/Kbuild
Normal file
16
fs/exofs/Kbuild
Normal file
|
@ -0,0 +1,16 @@
|
|||
#
|
||||
# Kbuild for the EXOFS module
|
||||
#
|
||||
# Copyright (C) 2008 Panasas Inc. All rights reserved.
|
||||
#
|
||||
# Authors:
|
||||
# Boaz Harrosh <bharrosh@panasas.com>
|
||||
#
|
||||
# This program is free software; you can redistribute it and/or modify
|
||||
# it under the terms of the GNU General Public License version 2
|
||||
#
|
||||
# Kbuild - Gets included from the Kernels Makefile and build system
|
||||
#
|
||||
|
||||
exofs-y := osd.o inode.o file.o symlink.o namei.o dir.o super.o
|
||||
obj-$(CONFIG_EXOFS_FS) += exofs.o
|
13
fs/exofs/Kconfig
Normal file
13
fs/exofs/Kconfig
Normal file
|
@ -0,0 +1,13 @@
|
|||
config EXOFS_FS
|
||||
tristate "exofs: OSD based file system support"
|
||||
depends on SCSI_OSD_ULD
|
||||
help
|
||||
EXOFS is a file system that uses an OSD storage device,
|
||||
as its backing storage.
|
||||
|
||||
# Debugging-related stuff
|
||||
config EXOFS_DEBUG
|
||||
bool "Enable debugging"
|
||||
depends on EXOFS_FS
|
||||
help
|
||||
This option enables EXOFS debug prints.
|
184
fs/exofs/common.h
Normal file
184
fs/exofs/common.h
Normal file
|
@ -0,0 +1,184 @@
|
|||
/*
|
||||
* common.h - Common definitions for both Kernel and user-mode utilities
|
||||
*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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_COM_H__
|
||||
#define __EXOFS_COM_H__
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
#include <scsi/osd_attributes.h>
|
||||
#include <scsi/osd_initiator.h>
|
||||
#include <scsi/osd_sec.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Object ID related defines
|
||||
* NOTE: inode# = object ID - EXOFS_OBJ_OFF
|
||||
****************************************************************************/
|
||||
#define EXOFS_MIN_PID 0x10000 /* Smallest partition ID */
|
||||
#define EXOFS_OBJ_OFF 0x10000 /* offset for objects */
|
||||
#define EXOFS_SUPER_ID 0x10000 /* object ID for on-disk superblock */
|
||||
#define EXOFS_ROOT_ID 0x10002 /* object ID for root directory */
|
||||
|
||||
/* exofs Application specific page/attribute */
|
||||
# define EXOFS_APAGE_FS_DATA (OSD_APAGE_APP_DEFINED_FIRST + 3)
|
||||
# define EXOFS_ATTR_INODE_DATA 1
|
||||
|
||||
/*
|
||||
* The maximum number of files we can have is limited by the size of the
|
||||
* inode number. This is the largest object ID that the file system supports.
|
||||
* Object IDs 0, 1, and 2 are always in use (see above defines).
|
||||
*/
|
||||
enum {
|
||||
EXOFS_MAX_INO_ID = (sizeof(ino_t) * 8 == 64) ? ULLONG_MAX :
|
||||
(1ULL << (sizeof(ino_t) * 8ULL - 1ULL)),
|
||||
EXOFS_MAX_ID = (EXOFS_MAX_INO_ID - 1 - EXOFS_OBJ_OFF),
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Misc.
|
||||
****************************************************************************/
|
||||
#define EXOFS_BLKSHIFT 12
|
||||
#define EXOFS_BLKSIZE (1UL << EXOFS_BLKSHIFT)
|
||||
|
||||
/****************************************************************************
|
||||
* superblock-related things
|
||||
****************************************************************************/
|
||||
#define EXOFS_SUPER_MAGIC 0x5DF5
|
||||
|
||||
/*
|
||||
* The file system control block - stored in an object's data (mainly, the one
|
||||
* with ID EXOFS_SUPER_ID). This is where the in-memory superblock is stored
|
||||
* on disk. Right now it just has a magic value, which is basically a sanity
|
||||
* check on our ability to communicate with the object store.
|
||||
*/
|
||||
struct exofs_fscb {
|
||||
__le64 s_nextid; /* Highest object ID used */
|
||||
__le32 s_numfiles; /* Number of files on fs */
|
||||
__le16 s_magic; /* Magic signature */
|
||||
__le16 s_newfs; /* Non-zero if this is a new fs */
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* inode-related things
|
||||
****************************************************************************/
|
||||
#define EXOFS_IDATA 5
|
||||
|
||||
/*
|
||||
* The file control block - stored in an object's attributes. This is where
|
||||
* the in-memory inode is stored on disk.
|
||||
*/
|
||||
struct exofs_fcb {
|
||||
__le64 i_size; /* Size of the file */
|
||||
__le16 i_mode; /* File mode */
|
||||
__le16 i_links_count; /* Links count */
|
||||
__le32 i_uid; /* Owner Uid */
|
||||
__le32 i_gid; /* Group Id */
|
||||
__le32 i_atime; /* Access time */
|
||||
__le32 i_ctime; /* Creation time */
|
||||
__le32 i_mtime; /* Modification time */
|
||||
__le32 i_flags; /* File flags (unused for now)*/
|
||||
__le32 i_generation; /* File version (for NFS) */
|
||||
__le32 i_data[EXOFS_IDATA]; /* Short symlink names and device #s */
|
||||
};
|
||||
|
||||
#define EXOFS_INO_ATTR_SIZE sizeof(struct exofs_fcb)
|
||||
|
||||
/* This is the Attribute the fcb is stored in */
|
||||
static const struct __weak osd_attr g_attr_inode_data = ATTR_DEF(
|
||||
EXOFS_APAGE_FS_DATA,
|
||||
EXOFS_ATTR_INODE_DATA,
|
||||
EXOFS_INO_ATTR_SIZE);
|
||||
|
||||
/****************************************************************************
|
||||
* dentry-related things
|
||||
****************************************************************************/
|
||||
#define EXOFS_NAME_LEN 255
|
||||
|
||||
/*
|
||||
* The on-disk directory entry
|
||||
*/
|
||||
struct exofs_dir_entry {
|
||||
__le64 inode_no; /* inode number */
|
||||
__le16 rec_len; /* directory entry length */
|
||||
u8 name_len; /* name length */
|
||||
u8 file_type; /* umm...file type */
|
||||
char name[EXOFS_NAME_LEN]; /* file name */
|
||||
};
|
||||
|
||||
enum {
|
||||
EXOFS_FT_UNKNOWN,
|
||||
EXOFS_FT_REG_FILE,
|
||||
EXOFS_FT_DIR,
|
||||
EXOFS_FT_CHRDEV,
|
||||
EXOFS_FT_BLKDEV,
|
||||
EXOFS_FT_FIFO,
|
||||
EXOFS_FT_SOCK,
|
||||
EXOFS_FT_SYMLINK,
|
||||
EXOFS_FT_MAX
|
||||
};
|
||||
|
||||
#define EXOFS_DIR_PAD 4
|
||||
#define EXOFS_DIR_ROUND (EXOFS_DIR_PAD - 1)
|
||||
#define EXOFS_DIR_REC_LEN(name_len) \
|
||||
(((name_len) + offsetof(struct exofs_dir_entry, name) + \
|
||||
EXOFS_DIR_ROUND) & ~EXOFS_DIR_ROUND)
|
||||
|
||||
/*************************
|
||||
* function declarations *
|
||||
*************************/
|
||||
/* osd.c */
|
||||
void exofs_make_credential(u8 cred_a[OSD_CAP_LEN],
|
||||
const struct osd_obj_id *obj);
|
||||
|
||||
int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid);
|
||||
static inline int exofs_check_ok(struct osd_request *or)
|
||||
{
|
||||
return exofs_check_ok_resid(or, NULL, NULL);
|
||||
}
|
||||
int exofs_sync_op(struct osd_request *or, int timeout, u8 *cred);
|
||||
int exofs_async_op(struct osd_request *or,
|
||||
osd_req_done_fn *async_done, void *caller_context, u8 *cred);
|
||||
|
||||
int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr);
|
||||
|
||||
int osd_req_read_kern(struct osd_request *or,
|
||||
const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
|
||||
|
||||
int osd_req_write_kern(struct osd_request *or,
|
||||
const struct osd_obj_id *obj, u64 offset, void *buff, u64 len);
|
||||
|
||||
#endif /*ifndef __EXOFS_COM_H__*/
|
672
fs/exofs/dir.c
Normal file
672
fs/exofs/dir.c
Normal file
|
@ -0,0 +1,672 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
static inline unsigned exofs_chunk_size(struct inode *inode)
|
||||
{
|
||||
return inode->i_sb->s_blocksize;
|
||||
}
|
||||
|
||||
static inline void exofs_put_page(struct page *page)
|
||||
{
|
||||
kunmap(page);
|
||||
page_cache_release(page);
|
||||
}
|
||||
|
||||
/* Accesses dir's inode->i_size must be called under inode lock */
|
||||
static inline unsigned long dir_pages(struct inode *inode)
|
||||
{
|
||||
return (inode->i_size + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
|
||||
}
|
||||
|
||||
static unsigned exofs_last_byte(struct inode *inode, unsigned long page_nr)
|
||||
{
|
||||
loff_t last_byte = inode->i_size;
|
||||
|
||||
last_byte -= page_nr << PAGE_CACHE_SHIFT;
|
||||
if (last_byte > PAGE_CACHE_SIZE)
|
||||
last_byte = PAGE_CACHE_SIZE;
|
||||
return last_byte;
|
||||
}
|
||||
|
||||
static int exofs_commit_chunk(struct page *page, loff_t pos, unsigned len)
|
||||
{
|
||||
struct address_space *mapping = page->mapping;
|
||||
struct inode *dir = mapping->host;
|
||||
int err = 0;
|
||||
|
||||
dir->i_version++;
|
||||
|
||||
if (!PageUptodate(page))
|
||||
SetPageUptodate(page);
|
||||
|
||||
if (pos+len > dir->i_size) {
|
||||
i_size_write(dir, pos+len);
|
||||
mark_inode_dirty(dir);
|
||||
}
|
||||
set_page_dirty(page);
|
||||
|
||||
if (IS_DIRSYNC(dir))
|
||||
err = write_one_page(page, 1);
|
||||
else
|
||||
unlock_page(page);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
static void exofs_check_page(struct page *page)
|
||||
{
|
||||
struct inode *dir = page->mapping->host;
|
||||
unsigned chunk_size = exofs_chunk_size(dir);
|
||||
char *kaddr = page_address(page);
|
||||
unsigned offs, rec_len;
|
||||
unsigned limit = PAGE_CACHE_SIZE;
|
||||
struct exofs_dir_entry *p;
|
||||
char *error;
|
||||
|
||||
/* if the page is the last one in the directory */
|
||||
if ((dir->i_size >> PAGE_CACHE_SHIFT) == page->index) {
|
||||
limit = dir->i_size & ~PAGE_CACHE_MASK;
|
||||
if (limit & (chunk_size - 1))
|
||||
goto Ebadsize;
|
||||
if (!limit)
|
||||
goto out;
|
||||
}
|
||||
for (offs = 0; offs <= limit - EXOFS_DIR_REC_LEN(1); offs += rec_len) {
|
||||
p = (struct exofs_dir_entry *)(kaddr + offs);
|
||||
rec_len = le16_to_cpu(p->rec_len);
|
||||
|
||||
if (rec_len < EXOFS_DIR_REC_LEN(1))
|
||||
goto Eshort;
|
||||
if (rec_len & 3)
|
||||
goto Ealign;
|
||||
if (rec_len < EXOFS_DIR_REC_LEN(p->name_len))
|
||||
goto Enamelen;
|
||||
if (((offs + rec_len - 1) ^ offs) & ~(chunk_size-1))
|
||||
goto Espan;
|
||||
}
|
||||
if (offs != limit)
|
||||
goto Eend;
|
||||
out:
|
||||
SetPageChecked(page);
|
||||
return;
|
||||
|
||||
Ebadsize:
|
||||
EXOFS_ERR("ERROR [exofs_check_page]: "
|
||||
"size of directory #%lu is not a multiple of chunk size",
|
||||
dir->i_ino
|
||||
);
|
||||
goto fail;
|
||||
Eshort:
|
||||
error = "rec_len is smaller than minimal";
|
||||
goto bad_entry;
|
||||
Ealign:
|
||||
error = "unaligned directory entry";
|
||||
goto bad_entry;
|
||||
Enamelen:
|
||||
error = "rec_len is too small for name_len";
|
||||
goto bad_entry;
|
||||
Espan:
|
||||
error = "directory entry across blocks";
|
||||
goto bad_entry;
|
||||
bad_entry:
|
||||
EXOFS_ERR(
|
||||
"ERROR [exofs_check_page]: bad entry in directory #%lu: %s - "
|
||||
"offset=%lu, inode=%llu, rec_len=%d, name_len=%d",
|
||||
dir->i_ino, error, (page->index<<PAGE_CACHE_SHIFT)+offs,
|
||||
_LLU(le64_to_cpu(p->inode_no)),
|
||||
rec_len, p->name_len);
|
||||
goto fail;
|
||||
Eend:
|
||||
p = (struct exofs_dir_entry *)(kaddr + offs);
|
||||
EXOFS_ERR("ERROR [exofs_check_page]: "
|
||||
"entry in directory #%lu spans the page boundary"
|
||||
"offset=%lu, inode=%llu",
|
||||
dir->i_ino, (page->index<<PAGE_CACHE_SHIFT)+offs,
|
||||
_LLU(le64_to_cpu(p->inode_no)));
|
||||
fail:
|
||||
SetPageChecked(page);
|
||||
SetPageError(page);
|
||||
}
|
||||
|
||||
static struct page *exofs_get_page(struct inode *dir, unsigned long n)
|
||||
{
|
||||
struct address_space *mapping = dir->i_mapping;
|
||||
struct page *page = read_mapping_page(mapping, n, NULL);
|
||||
|
||||
if (!IS_ERR(page)) {
|
||||
kmap(page);
|
||||
if (!PageChecked(page))
|
||||
exofs_check_page(page);
|
||||
if (PageError(page))
|
||||
goto fail;
|
||||
}
|
||||
return page;
|
||||
|
||||
fail:
|
||||
exofs_put_page(page);
|
||||
return ERR_PTR(-EIO);
|
||||
}
|
||||
|
||||
static inline int exofs_match(int len, const unsigned char *name,
|
||||
struct exofs_dir_entry *de)
|
||||
{
|
||||
if (len != de->name_len)
|
||||
return 0;
|
||||
if (!de->inode_no)
|
||||
return 0;
|
||||
return !memcmp(name, de->name, len);
|
||||
}
|
||||
|
||||
static inline
|
||||
struct exofs_dir_entry *exofs_next_entry(struct exofs_dir_entry *p)
|
||||
{
|
||||
return (struct exofs_dir_entry *)((char *)p + le16_to_cpu(p->rec_len));
|
||||
}
|
||||
|
||||
static inline unsigned
|
||||
exofs_validate_entry(char *base, unsigned offset, unsigned mask)
|
||||
{
|
||||
struct exofs_dir_entry *de = (struct exofs_dir_entry *)(base + offset);
|
||||
struct exofs_dir_entry *p =
|
||||
(struct exofs_dir_entry *)(base + (offset&mask));
|
||||
while ((char *)p < (char *)de) {
|
||||
if (p->rec_len == 0)
|
||||
break;
|
||||
p = exofs_next_entry(p);
|
||||
}
|
||||
return (char *)p - base;
|
||||
}
|
||||
|
||||
static unsigned char exofs_filetype_table[EXOFS_FT_MAX] = {
|
||||
[EXOFS_FT_UNKNOWN] = DT_UNKNOWN,
|
||||
[EXOFS_FT_REG_FILE] = DT_REG,
|
||||
[EXOFS_FT_DIR] = DT_DIR,
|
||||
[EXOFS_FT_CHRDEV] = DT_CHR,
|
||||
[EXOFS_FT_BLKDEV] = DT_BLK,
|
||||
[EXOFS_FT_FIFO] = DT_FIFO,
|
||||
[EXOFS_FT_SOCK] = DT_SOCK,
|
||||
[EXOFS_FT_SYMLINK] = DT_LNK,
|
||||
};
|
||||
|
||||
#define S_SHIFT 12
|
||||
static unsigned char exofs_type_by_mode[S_IFMT >> S_SHIFT] = {
|
||||
[S_IFREG >> S_SHIFT] = EXOFS_FT_REG_FILE,
|
||||
[S_IFDIR >> S_SHIFT] = EXOFS_FT_DIR,
|
||||
[S_IFCHR >> S_SHIFT] = EXOFS_FT_CHRDEV,
|
||||
[S_IFBLK >> S_SHIFT] = EXOFS_FT_BLKDEV,
|
||||
[S_IFIFO >> S_SHIFT] = EXOFS_FT_FIFO,
|
||||
[S_IFSOCK >> S_SHIFT] = EXOFS_FT_SOCK,
|
||||
[S_IFLNK >> S_SHIFT] = EXOFS_FT_SYMLINK,
|
||||
};
|
||||
|
||||
static inline
|
||||
void exofs_set_de_type(struct exofs_dir_entry *de, struct inode *inode)
|
||||
{
|
||||
mode_t mode = inode->i_mode;
|
||||
de->file_type = exofs_type_by_mode[(mode & S_IFMT) >> S_SHIFT];
|
||||
}
|
||||
|
||||
static int
|
||||
exofs_readdir(struct file *filp, void *dirent, filldir_t filldir)
|
||||
{
|
||||
loff_t pos = filp->f_pos;
|
||||
struct inode *inode = filp->f_path.dentry->d_inode;
|
||||
unsigned int offset = pos & ~PAGE_CACHE_MASK;
|
||||
unsigned long n = pos >> PAGE_CACHE_SHIFT;
|
||||
unsigned long npages = dir_pages(inode);
|
||||
unsigned chunk_mask = ~(exofs_chunk_size(inode)-1);
|
||||
unsigned char *types = NULL;
|
||||
int need_revalidate = (filp->f_version != inode->i_version);
|
||||
|
||||
if (pos > inode->i_size - EXOFS_DIR_REC_LEN(1))
|
||||
return 0;
|
||||
|
||||
types = exofs_filetype_table;
|
||||
|
||||
for ( ; n < npages; n++, offset = 0) {
|
||||
char *kaddr, *limit;
|
||||
struct exofs_dir_entry *de;
|
||||
struct page *page = exofs_get_page(inode, n);
|
||||
|
||||
if (IS_ERR(page)) {
|
||||
EXOFS_ERR("ERROR: "
|
||||
"bad page in #%lu",
|
||||
inode->i_ino);
|
||||
filp->f_pos += PAGE_CACHE_SIZE - offset;
|
||||
return PTR_ERR(page);
|
||||
}
|
||||
kaddr = page_address(page);
|
||||
if (unlikely(need_revalidate)) {
|
||||
if (offset) {
|
||||
offset = exofs_validate_entry(kaddr, offset,
|
||||
chunk_mask);
|
||||
filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
|
||||
}
|
||||
filp->f_version = inode->i_version;
|
||||
need_revalidate = 0;
|
||||
}
|
||||
de = (struct exofs_dir_entry *)(kaddr + offset);
|
||||
limit = kaddr + exofs_last_byte(inode, n) -
|
||||
EXOFS_DIR_REC_LEN(1);
|
||||
for (; (char *)de <= limit; de = exofs_next_entry(de)) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: "
|
||||
"zero-length directory entry");
|
||||
exofs_put_page(page);
|
||||
return -EIO;
|
||||
}
|
||||
if (de->inode_no) {
|
||||
int over;
|
||||
unsigned char d_type = DT_UNKNOWN;
|
||||
|
||||
if (types && de->file_type < EXOFS_FT_MAX)
|
||||
d_type = types[de->file_type];
|
||||
|
||||
offset = (char *)de - kaddr;
|
||||
over = filldir(dirent, de->name, de->name_len,
|
||||
(n<<PAGE_CACHE_SHIFT) | offset,
|
||||
le64_to_cpu(de->inode_no),
|
||||
d_type);
|
||||
if (over) {
|
||||
exofs_put_page(page);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
filp->f_pos += le16_to_cpu(de->rec_len);
|
||||
}
|
||||
exofs_put_page(page);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct exofs_dir_entry *exofs_find_entry(struct inode *dir,
|
||||
struct dentry *dentry, struct page **res_page)
|
||||
{
|
||||
const unsigned char *name = dentry->d_name.name;
|
||||
int namelen = dentry->d_name.len;
|
||||
unsigned reclen = EXOFS_DIR_REC_LEN(namelen);
|
||||
unsigned long start, n;
|
||||
unsigned long npages = dir_pages(dir);
|
||||
struct page *page = NULL;
|
||||
struct exofs_i_info *oi = exofs_i(dir);
|
||||
struct exofs_dir_entry *de;
|
||||
|
||||
if (npages == 0)
|
||||
goto out;
|
||||
|
||||
*res_page = NULL;
|
||||
|
||||
start = oi->i_dir_start_lookup;
|
||||
if (start >= npages)
|
||||
start = 0;
|
||||
n = start;
|
||||
do {
|
||||
char *kaddr;
|
||||
page = exofs_get_page(dir, n);
|
||||
if (!IS_ERR(page)) {
|
||||
kaddr = page_address(page);
|
||||
de = (struct exofs_dir_entry *) kaddr;
|
||||
kaddr += exofs_last_byte(dir, n) - reclen;
|
||||
while ((char *) de <= kaddr) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR(
|
||||
"ERROR: exofs_find_entry: "
|
||||
"zero-length directory entry");
|
||||
exofs_put_page(page);
|
||||
goto out;
|
||||
}
|
||||
if (exofs_match(namelen, name, de))
|
||||
goto found;
|
||||
de = exofs_next_entry(de);
|
||||
}
|
||||
exofs_put_page(page);
|
||||
}
|
||||
if (++n >= npages)
|
||||
n = 0;
|
||||
} while (n != start);
|
||||
out:
|
||||
return NULL;
|
||||
|
||||
found:
|
||||
*res_page = page;
|
||||
oi->i_dir_start_lookup = n;
|
||||
return de;
|
||||
}
|
||||
|
||||
struct exofs_dir_entry *exofs_dotdot(struct inode *dir, struct page **p)
|
||||
{
|
||||
struct page *page = exofs_get_page(dir, 0);
|
||||
struct exofs_dir_entry *de = NULL;
|
||||
|
||||
if (!IS_ERR(page)) {
|
||||
de = exofs_next_entry(
|
||||
(struct exofs_dir_entry *)page_address(page));
|
||||
*p = page;
|
||||
}
|
||||
return de;
|
||||
}
|
||||
|
||||
ino_t exofs_parent_ino(struct dentry *child)
|
||||
{
|
||||
struct page *page;
|
||||
struct exofs_dir_entry *de;
|
||||
ino_t ino;
|
||||
|
||||
de = exofs_dotdot(child->d_inode, &page);
|
||||
if (!de)
|
||||
return 0;
|
||||
|
||||
ino = le64_to_cpu(de->inode_no);
|
||||
exofs_put_page(page);
|
||||
return ino;
|
||||
}
|
||||
|
||||
ino_t exofs_inode_by_name(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
ino_t res = 0;
|
||||
struct exofs_dir_entry *de;
|
||||
struct page *page;
|
||||
|
||||
de = exofs_find_entry(dir, dentry, &page);
|
||||
if (de) {
|
||||
res = le64_to_cpu(de->inode_no);
|
||||
exofs_put_page(page);
|
||||
}
|
||||
return res;
|
||||
}
|
||||
|
||||
int exofs_set_link(struct inode *dir, struct exofs_dir_entry *de,
|
||||
struct page *page, struct inode *inode)
|
||||
{
|
||||
loff_t pos = page_offset(page) +
|
||||
(char *) de - (char *) page_address(page);
|
||||
unsigned len = le16_to_cpu(de->rec_len);
|
||||
int err;
|
||||
|
||||
lock_page(page);
|
||||
err = exofs_write_begin(NULL, page->mapping, pos, len,
|
||||
AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
|
||||
if (err)
|
||||
EXOFS_ERR("exofs_set_link: exofs_write_begin FAILD => %d\n",
|
||||
err);
|
||||
|
||||
de->inode_no = cpu_to_le64(inode->i_ino);
|
||||
exofs_set_de_type(de, inode);
|
||||
if (likely(!err))
|
||||
err = exofs_commit_chunk(page, pos, len);
|
||||
exofs_put_page(page);
|
||||
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
||||
mark_inode_dirty(dir);
|
||||
return err;
|
||||
}
|
||||
|
||||
int exofs_add_link(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
struct inode *dir = dentry->d_parent->d_inode;
|
||||
const unsigned char *name = dentry->d_name.name;
|
||||
int namelen = dentry->d_name.len;
|
||||
unsigned chunk_size = exofs_chunk_size(dir);
|
||||
unsigned reclen = EXOFS_DIR_REC_LEN(namelen);
|
||||
unsigned short rec_len, name_len;
|
||||
struct page *page = NULL;
|
||||
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
|
||||
struct exofs_dir_entry *de;
|
||||
unsigned long npages = dir_pages(dir);
|
||||
unsigned long n;
|
||||
char *kaddr;
|
||||
loff_t pos;
|
||||
int err;
|
||||
|
||||
for (n = 0; n <= npages; n++) {
|
||||
char *dir_end;
|
||||
|
||||
page = exofs_get_page(dir, n);
|
||||
err = PTR_ERR(page);
|
||||
if (IS_ERR(page))
|
||||
goto out;
|
||||
lock_page(page);
|
||||
kaddr = page_address(page);
|
||||
dir_end = kaddr + exofs_last_byte(dir, n);
|
||||
de = (struct exofs_dir_entry *)kaddr;
|
||||
kaddr += PAGE_CACHE_SIZE - reclen;
|
||||
while ((char *)de <= kaddr) {
|
||||
if ((char *)de == dir_end) {
|
||||
name_len = 0;
|
||||
rec_len = chunk_size;
|
||||
de->rec_len = cpu_to_le16(chunk_size);
|
||||
de->inode_no = 0;
|
||||
goto got_it;
|
||||
}
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: exofs_add_link: "
|
||||
"zero-length directory entry");
|
||||
err = -EIO;
|
||||
goto out_unlock;
|
||||
}
|
||||
err = -EEXIST;
|
||||
if (exofs_match(namelen, name, de))
|
||||
goto out_unlock;
|
||||
name_len = EXOFS_DIR_REC_LEN(de->name_len);
|
||||
rec_len = le16_to_cpu(de->rec_len);
|
||||
if (!de->inode_no && rec_len >= reclen)
|
||||
goto got_it;
|
||||
if (rec_len >= name_len + reclen)
|
||||
goto got_it;
|
||||
de = (struct exofs_dir_entry *) ((char *) de + rec_len);
|
||||
}
|
||||
unlock_page(page);
|
||||
exofs_put_page(page);
|
||||
}
|
||||
|
||||
EXOFS_ERR("exofs_add_link: BAD dentry=%p or inode=%p", dentry, inode);
|
||||
return -EINVAL;
|
||||
|
||||
got_it:
|
||||
pos = page_offset(page) +
|
||||
(char *)de - (char *)page_address(page);
|
||||
err = exofs_write_begin(NULL, page->mapping, pos, rec_len, 0,
|
||||
&page, NULL);
|
||||
if (err)
|
||||
goto out_unlock;
|
||||
if (de->inode_no) {
|
||||
struct exofs_dir_entry *de1 =
|
||||
(struct exofs_dir_entry *)((char *)de + name_len);
|
||||
de1->rec_len = cpu_to_le16(rec_len - name_len);
|
||||
de->rec_len = cpu_to_le16(name_len);
|
||||
de = de1;
|
||||
}
|
||||
de->name_len = namelen;
|
||||
memcpy(de->name, name, namelen);
|
||||
de->inode_no = cpu_to_le64(inode->i_ino);
|
||||
exofs_set_de_type(de, inode);
|
||||
err = exofs_commit_chunk(page, pos, rec_len);
|
||||
dir->i_mtime = dir->i_ctime = CURRENT_TIME;
|
||||
mark_inode_dirty(dir);
|
||||
sbi->s_numfiles++;
|
||||
|
||||
out_put:
|
||||
exofs_put_page(page);
|
||||
out:
|
||||
return err;
|
||||
out_unlock:
|
||||
unlock_page(page);
|
||||
goto out_put;
|
||||
}
|
||||
|
||||
int exofs_delete_entry(struct exofs_dir_entry *dir, struct page *page)
|
||||
{
|
||||
struct address_space *mapping = page->mapping;
|
||||
struct inode *inode = mapping->host;
|
||||
struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
|
||||
char *kaddr = page_address(page);
|
||||
unsigned from = ((char *)dir - kaddr) & ~(exofs_chunk_size(inode)-1);
|
||||
unsigned to = ((char *)dir - kaddr) + le16_to_cpu(dir->rec_len);
|
||||
loff_t pos;
|
||||
struct exofs_dir_entry *pde = NULL;
|
||||
struct exofs_dir_entry *de = (struct exofs_dir_entry *) (kaddr + from);
|
||||
int err;
|
||||
|
||||
while (de < dir) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: exofs_delete_entry:"
|
||||
"zero-length directory entry");
|
||||
err = -EIO;
|
||||
goto out;
|
||||
}
|
||||
pde = de;
|
||||
de = exofs_next_entry(de);
|
||||
}
|
||||
if (pde)
|
||||
from = (char *)pde - (char *)page_address(page);
|
||||
pos = page_offset(page) + from;
|
||||
lock_page(page);
|
||||
err = exofs_write_begin(NULL, page->mapping, pos, to - from, 0,
|
||||
&page, NULL);
|
||||
if (err)
|
||||
EXOFS_ERR("exofs_delete_entry: exofs_write_begin FAILD => %d\n",
|
||||
err);
|
||||
if (pde)
|
||||
pde->rec_len = cpu_to_le16(to - from);
|
||||
dir->inode_no = 0;
|
||||
if (likely(!err))
|
||||
err = exofs_commit_chunk(page, pos, to - from);
|
||||
inode->i_ctime = inode->i_mtime = CURRENT_TIME;
|
||||
mark_inode_dirty(inode);
|
||||
sbi->s_numfiles--;
|
||||
out:
|
||||
exofs_put_page(page);
|
||||
return err;
|
||||
}
|
||||
|
||||
/* kept aligned on 4 bytes */
|
||||
#define THIS_DIR ".\0\0"
|
||||
#define PARENT_DIR "..\0"
|
||||
|
||||
int exofs_make_empty(struct inode *inode, struct inode *parent)
|
||||
{
|
||||
struct address_space *mapping = inode->i_mapping;
|
||||
struct page *page = grab_cache_page(mapping, 0);
|
||||
unsigned chunk_size = exofs_chunk_size(inode);
|
||||
struct exofs_dir_entry *de;
|
||||
int err;
|
||||
void *kaddr;
|
||||
|
||||
if (!page)
|
||||
return -ENOMEM;
|
||||
|
||||
err = exofs_write_begin(NULL, page->mapping, 0, chunk_size, 0,
|
||||
&page, NULL);
|
||||
if (err) {
|
||||
unlock_page(page);
|
||||
goto fail;
|
||||
}
|
||||
|
||||
kaddr = kmap_atomic(page, KM_USER0);
|
||||
de = (struct exofs_dir_entry *)kaddr;
|
||||
de->name_len = 1;
|
||||
de->rec_len = cpu_to_le16(EXOFS_DIR_REC_LEN(1));
|
||||
memcpy(de->name, THIS_DIR, sizeof(THIS_DIR));
|
||||
de->inode_no = cpu_to_le64(inode->i_ino);
|
||||
exofs_set_de_type(de, inode);
|
||||
|
||||
de = (struct exofs_dir_entry *)(kaddr + EXOFS_DIR_REC_LEN(1));
|
||||
de->name_len = 2;
|
||||
de->rec_len = cpu_to_le16(chunk_size - EXOFS_DIR_REC_LEN(1));
|
||||
de->inode_no = cpu_to_le64(parent->i_ino);
|
||||
memcpy(de->name, PARENT_DIR, sizeof(PARENT_DIR));
|
||||
exofs_set_de_type(de, inode);
|
||||
kunmap_atomic(page, KM_USER0);
|
||||
err = exofs_commit_chunk(page, 0, chunk_size);
|
||||
fail:
|
||||
page_cache_release(page);
|
||||
return err;
|
||||
}
|
||||
|
||||
int exofs_empty_dir(struct inode *inode)
|
||||
{
|
||||
struct page *page = NULL;
|
||||
unsigned long i, npages = dir_pages(inode);
|
||||
|
||||
for (i = 0; i < npages; i++) {
|
||||
char *kaddr;
|
||||
struct exofs_dir_entry *de;
|
||||
page = exofs_get_page(inode, i);
|
||||
|
||||
if (IS_ERR(page))
|
||||
continue;
|
||||
|
||||
kaddr = page_address(page);
|
||||
de = (struct exofs_dir_entry *)kaddr;
|
||||
kaddr += exofs_last_byte(inode, i) - EXOFS_DIR_REC_LEN(1);
|
||||
|
||||
while ((char *)de <= kaddr) {
|
||||
if (de->rec_len == 0) {
|
||||
EXOFS_ERR("ERROR: exofs_empty_dir: "
|
||||
"zero-length directory entry"
|
||||
"kaddr=%p, de=%p\n", kaddr, de);
|
||||
goto not_empty;
|
||||
}
|
||||
if (de->inode_no != 0) {
|
||||
/* check for . and .. */
|
||||
if (de->name[0] != '.')
|
||||
goto not_empty;
|
||||
if (de->name_len > 2)
|
||||
goto not_empty;
|
||||
if (de->name_len < 2) {
|
||||
if (le64_to_cpu(de->inode_no) !=
|
||||
inode->i_ino)
|
||||
goto not_empty;
|
||||
} else if (de->name[1] != '.')
|
||||
goto not_empty;
|
||||
}
|
||||
de = exofs_next_entry(de);
|
||||
}
|
||||
exofs_put_page(page);
|
||||
}
|
||||
return 1;
|
||||
|
||||
not_empty:
|
||||
exofs_put_page(page);
|
||||
return 0;
|
||||
}
|
||||
|
||||
const struct file_operations exofs_dir_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = generic_read_dir,
|
||||
.readdir = exofs_readdir,
|
||||
};
|
180
fs/exofs/exofs.h
Normal file
180
fs/exofs/exofs.h
Normal file
|
@ -0,0 +1,180 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include <linux/fs.h>
|
||||
#include <linux/time.h>
|
||||
#include "common.h"
|
||||
|
||||
#ifndef __EXOFS_H__
|
||||
#define __EXOFS_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)
|
||||
|
||||
/*
|
||||
* our extension to the in-memory superblock
|
||||
*/
|
||||
struct exofs_sb_info {
|
||||
struct osd_dev *s_dev; /* returned by get_osd_dev */
|
||||
osd_id s_pid; /* partition ID of file system*/
|
||||
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 */
|
||||
uint8_t s_cred[OSD_CAP_LEN]; /* all-powerful credential */
|
||||
};
|
||||
|
||||
/*
|
||||
* our extension to the in-memory inode
|
||||
*/
|
||||
struct exofs_i_info {
|
||||
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 */
|
||||
wait_queue_head_t i_wq; /* wait queue for inode */
|
||||
uint64_t i_commit_size; /* the object's written length */
|
||||
uint8_t i_cred[OSD_CAP_LEN];/* all-powerful credential */
|
||||
struct inode vfs_inode; /* normal in-memory inode */
|
||||
};
|
||||
|
||||
/*
|
||||
* 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 */
|
||||
void exofs_truncate(struct inode *inode);
|
||||
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 *, int);
|
||||
extern int exofs_write_inode(struct inode *, int);
|
||||
extern void exofs_delete_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 *);
|
||||
|
||||
/*********************
|
||||
* 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;
|
||||
|
||||
#endif
|
87
fs/exofs/file.c
Normal file
87
fs/exofs/file.c
Normal file
|
@ -0,0 +1,87 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include <linux/buffer_head.h>
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
static int exofs_release_file(struct inode *inode, struct file *filp)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int exofs_file_fsync(struct file *filp, struct dentry *dentry,
|
||||
int datasync)
|
||||
{
|
||||
int ret;
|
||||
struct address_space *mapping = filp->f_mapping;
|
||||
|
||||
ret = filemap_write_and_wait(mapping);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/*Note: file_fsync below also calles sync_blockdev, which is a no-op
|
||||
* for exofs, but other then that it does sync_inode and
|
||||
* sync_superblock which is what we need here.
|
||||
*/
|
||||
return file_fsync(filp, dentry, datasync);
|
||||
}
|
||||
|
||||
static int exofs_flush(struct file *file, fl_owner_t id)
|
||||
{
|
||||
exofs_file_fsync(file, file->f_path.dentry, 1);
|
||||
/* TODO: Flush the OSD target */
|
||||
return 0;
|
||||
}
|
||||
|
||||
const struct file_operations exofs_file_operations = {
|
||||
.llseek = generic_file_llseek,
|
||||
.read = do_sync_read,
|
||||
.write = do_sync_write,
|
||||
.aio_read = generic_file_aio_read,
|
||||
.aio_write = generic_file_aio_write,
|
||||
.mmap = generic_file_mmap,
|
||||
.open = generic_file_open,
|
||||
.release = exofs_release_file,
|
||||
.fsync = exofs_file_fsync,
|
||||
.flush = exofs_flush,
|
||||
.splice_read = generic_file_splice_read,
|
||||
.splice_write = generic_file_splice_write,
|
||||
};
|
||||
|
||||
const struct inode_operations exofs_file_inode_operations = {
|
||||
.truncate = exofs_truncate,
|
||||
.setattr = exofs_setattr,
|
||||
};
|
1303
fs/exofs/inode.c
Normal file
1303
fs/exofs/inode.c
Normal file
File diff suppressed because it is too large
Load diff
342
fs/exofs/namei.c
Normal file
342
fs/exofs/namei.c
Normal file
|
@ -0,0 +1,342 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
static inline int exofs_add_nondir(struct dentry *dentry, struct inode *inode)
|
||||
{
|
||||
int err = exofs_add_link(dentry, inode);
|
||||
if (!err) {
|
||||
d_instantiate(dentry, inode);
|
||||
return 0;
|
||||
}
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
return err;
|
||||
}
|
||||
|
||||
static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
|
||||
struct nameidata *nd)
|
||||
{
|
||||
struct inode *inode;
|
||||
ino_t ino;
|
||||
|
||||
if (dentry->d_name.len > EXOFS_NAME_LEN)
|
||||
return ERR_PTR(-ENAMETOOLONG);
|
||||
|
||||
ino = exofs_inode_by_name(dir, dentry);
|
||||
inode = NULL;
|
||||
if (ino) {
|
||||
inode = exofs_iget(dir->i_sb, ino);
|
||||
if (IS_ERR(inode))
|
||||
return ERR_CAST(inode);
|
||||
}
|
||||
return d_splice_alias(inode, dentry);
|
||||
}
|
||||
|
||||
static int exofs_create(struct inode *dir, struct dentry *dentry, int mode,
|
||||
struct nameidata *nd)
|
||||
{
|
||||
struct inode *inode = exofs_new_inode(dir, mode);
|
||||
int err = PTR_ERR(inode);
|
||||
if (!IS_ERR(inode)) {
|
||||
inode->i_op = &exofs_file_inode_operations;
|
||||
inode->i_fop = &exofs_file_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
mark_inode_dirty(inode);
|
||||
err = exofs_add_nondir(dentry, inode);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_mknod(struct inode *dir, struct dentry *dentry, int mode,
|
||||
dev_t rdev)
|
||||
{
|
||||
struct inode *inode;
|
||||
int err;
|
||||
|
||||
if (!new_valid_dev(rdev))
|
||||
return -EINVAL;
|
||||
|
||||
inode = exofs_new_inode(dir, mode);
|
||||
err = PTR_ERR(inode);
|
||||
if (!IS_ERR(inode)) {
|
||||
init_special_inode(inode, inode->i_mode, rdev);
|
||||
mark_inode_dirty(inode);
|
||||
err = exofs_add_nondir(dentry, inode);
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_symlink(struct inode *dir, struct dentry *dentry,
|
||||
const char *symname)
|
||||
{
|
||||
struct super_block *sb = dir->i_sb;
|
||||
int err = -ENAMETOOLONG;
|
||||
unsigned l = strlen(symname)+1;
|
||||
struct inode *inode;
|
||||
struct exofs_i_info *oi;
|
||||
|
||||
if (l > sb->s_blocksize)
|
||||
goto out;
|
||||
|
||||
inode = exofs_new_inode(dir, S_IFLNK | S_IRWXUGO);
|
||||
err = PTR_ERR(inode);
|
||||
if (IS_ERR(inode))
|
||||
goto out;
|
||||
|
||||
oi = exofs_i(inode);
|
||||
if (l > sizeof(oi->i_data)) {
|
||||
/* slow symlink */
|
||||
inode->i_op = &exofs_symlink_inode_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
memset(oi->i_data, 0, sizeof(oi->i_data));
|
||||
|
||||
err = page_symlink(inode, symname, l);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
} else {
|
||||
/* fast symlink */
|
||||
inode->i_op = &exofs_fast_symlink_inode_operations;
|
||||
memcpy(oi->i_data, symname, l);
|
||||
inode->i_size = l-1;
|
||||
}
|
||||
mark_inode_dirty(inode);
|
||||
|
||||
err = exofs_add_nondir(dentry, inode);
|
||||
out:
|
||||
return err;
|
||||
|
||||
out_fail:
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int exofs_link(struct dentry *old_dentry, struct inode *dir,
|
||||
struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = old_dentry->d_inode;
|
||||
|
||||
if (inode->i_nlink >= EXOFS_LINK_MAX)
|
||||
return -EMLINK;
|
||||
|
||||
inode->i_ctime = CURRENT_TIME;
|
||||
inode_inc_link_count(inode);
|
||||
atomic_inc(&inode->i_count);
|
||||
|
||||
return exofs_add_nondir(dentry, inode);
|
||||
}
|
||||
|
||||
static int exofs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
||||
{
|
||||
struct inode *inode;
|
||||
int err = -EMLINK;
|
||||
|
||||
if (dir->i_nlink >= EXOFS_LINK_MAX)
|
||||
goto out;
|
||||
|
||||
inode_inc_link_count(dir);
|
||||
|
||||
inode = exofs_new_inode(dir, S_IFDIR | mode);
|
||||
err = PTR_ERR(inode);
|
||||
if (IS_ERR(inode))
|
||||
goto out_dir;
|
||||
|
||||
inode->i_op = &exofs_dir_inode_operations;
|
||||
inode->i_fop = &exofs_dir_operations;
|
||||
inode->i_mapping->a_ops = &exofs_aops;
|
||||
|
||||
inode_inc_link_count(inode);
|
||||
|
||||
err = exofs_make_empty(inode, dir);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
err = exofs_add_link(dentry, inode);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
d_instantiate(dentry, inode);
|
||||
out:
|
||||
return err;
|
||||
|
||||
out_fail:
|
||||
inode_dec_link_count(inode);
|
||||
inode_dec_link_count(inode);
|
||||
iput(inode);
|
||||
out_dir:
|
||||
inode_dec_link_count(dir);
|
||||
goto out;
|
||||
}
|
||||
|
||||
static int exofs_unlink(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
struct exofs_dir_entry *de;
|
||||
struct page *page;
|
||||
int err = -ENOENT;
|
||||
|
||||
de = exofs_find_entry(dir, dentry, &page);
|
||||
if (!de)
|
||||
goto out;
|
||||
|
||||
err = exofs_delete_entry(de, page);
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
inode->i_ctime = dir->i_ctime;
|
||||
inode_dec_link_count(inode);
|
||||
err = 0;
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_rmdir(struct inode *dir, struct dentry *dentry)
|
||||
{
|
||||
struct inode *inode = dentry->d_inode;
|
||||
int err = -ENOTEMPTY;
|
||||
|
||||
if (exofs_empty_dir(inode)) {
|
||||
err = exofs_unlink(dir, dentry);
|
||||
if (!err) {
|
||||
inode->i_size = 0;
|
||||
inode_dec_link_count(inode);
|
||||
inode_dec_link_count(dir);
|
||||
}
|
||||
}
|
||||
return err;
|
||||
}
|
||||
|
||||
static int exofs_rename(struct inode *old_dir, struct dentry *old_dentry,
|
||||
struct inode *new_dir, struct dentry *new_dentry)
|
||||
{
|
||||
struct inode *old_inode = old_dentry->d_inode;
|
||||
struct inode *new_inode = new_dentry->d_inode;
|
||||
struct page *dir_page = NULL;
|
||||
struct exofs_dir_entry *dir_de = NULL;
|
||||
struct page *old_page;
|
||||
struct exofs_dir_entry *old_de;
|
||||
int err = -ENOENT;
|
||||
|
||||
old_de = exofs_find_entry(old_dir, old_dentry, &old_page);
|
||||
if (!old_de)
|
||||
goto out;
|
||||
|
||||
if (S_ISDIR(old_inode->i_mode)) {
|
||||
err = -EIO;
|
||||
dir_de = exofs_dotdot(old_inode, &dir_page);
|
||||
if (!dir_de)
|
||||
goto out_old;
|
||||
}
|
||||
|
||||
if (new_inode) {
|
||||
struct page *new_page;
|
||||
struct exofs_dir_entry *new_de;
|
||||
|
||||
err = -ENOTEMPTY;
|
||||
if (dir_de && !exofs_empty_dir(new_inode))
|
||||
goto out_dir;
|
||||
|
||||
err = -ENOENT;
|
||||
new_de = exofs_find_entry(new_dir, new_dentry, &new_page);
|
||||
if (!new_de)
|
||||
goto out_dir;
|
||||
inode_inc_link_count(old_inode);
|
||||
err = exofs_set_link(new_dir, new_de, new_page, old_inode);
|
||||
new_inode->i_ctime = CURRENT_TIME;
|
||||
if (dir_de)
|
||||
drop_nlink(new_inode);
|
||||
inode_dec_link_count(new_inode);
|
||||
if (err)
|
||||
goto out_dir;
|
||||
} else {
|
||||
if (dir_de) {
|
||||
err = -EMLINK;
|
||||
if (new_dir->i_nlink >= EXOFS_LINK_MAX)
|
||||
goto out_dir;
|
||||
}
|
||||
inode_inc_link_count(old_inode);
|
||||
err = exofs_add_link(new_dentry, old_inode);
|
||||
if (err) {
|
||||
inode_dec_link_count(old_inode);
|
||||
goto out_dir;
|
||||
}
|
||||
if (dir_de)
|
||||
inode_inc_link_count(new_dir);
|
||||
}
|
||||
|
||||
old_inode->i_ctime = CURRENT_TIME;
|
||||
|
||||
exofs_delete_entry(old_de, old_page);
|
||||
inode_dec_link_count(old_inode);
|
||||
|
||||
if (dir_de) {
|
||||
err = exofs_set_link(old_inode, dir_de, dir_page, new_dir);
|
||||
inode_dec_link_count(old_dir);
|
||||
if (err)
|
||||
goto out_dir;
|
||||
}
|
||||
return 0;
|
||||
|
||||
|
||||
out_dir:
|
||||
if (dir_de) {
|
||||
kunmap(dir_page);
|
||||
page_cache_release(dir_page);
|
||||
}
|
||||
out_old:
|
||||
kunmap(old_page);
|
||||
page_cache_release(old_page);
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
const struct inode_operations exofs_dir_inode_operations = {
|
||||
.create = exofs_create,
|
||||
.lookup = exofs_lookup,
|
||||
.link = exofs_link,
|
||||
.unlink = exofs_unlink,
|
||||
.symlink = exofs_symlink,
|
||||
.mkdir = exofs_mkdir,
|
||||
.rmdir = exofs_rmdir,
|
||||
.mknod = exofs_mknod,
|
||||
.rename = exofs_rename,
|
||||
.setattr = exofs_setattr,
|
||||
};
|
||||
|
||||
const struct inode_operations exofs_special_inode_operations = {
|
||||
.setattr = exofs_setattr,
|
||||
};
|
153
fs/exofs/osd.c
Normal file
153
fs/exofs/osd.c
Normal file
|
@ -0,0 +1,153 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include <scsi/scsi_device.h>
|
||||
#include <scsi/osd_sense.h>
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
int exofs_check_ok_resid(struct osd_request *or, u64 *in_resid, u64 *out_resid)
|
||||
{
|
||||
struct osd_sense_info osi;
|
||||
int ret = osd_req_decode_sense(or, &osi);
|
||||
|
||||
if (ret) { /* translate to Linux codes */
|
||||
if (osi.additional_code == scsi_invalid_field_in_cdb) {
|
||||
if (osi.cdb_field_offset == OSD_CFO_STARTING_BYTE)
|
||||
ret = -EFAULT;
|
||||
if (osi.cdb_field_offset == OSD_CFO_OBJECT_ID)
|
||||
ret = -ENOENT;
|
||||
else
|
||||
ret = -EINVAL;
|
||||
} else if (osi.additional_code == osd_quota_error)
|
||||
ret = -ENOSPC;
|
||||
else
|
||||
ret = -EIO;
|
||||
}
|
||||
|
||||
/* FIXME: should be include in osd_sense_info */
|
||||
if (in_resid)
|
||||
*in_resid = or->in.req ? or->in.req->data_len : 0;
|
||||
|
||||
if (out_resid)
|
||||
*out_resid = or->out.req ? or->out.req->data_len : 0;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj)
|
||||
{
|
||||
osd_sec_init_nosec_doall_caps(cred_a, obj, false, true);
|
||||
}
|
||||
|
||||
/*
|
||||
* Perform a synchronous OSD operation.
|
||||
*/
|
||||
int exofs_sync_op(struct osd_request *or, int timeout, uint8_t *credential)
|
||||
{
|
||||
int ret;
|
||||
|
||||
or->timeout = timeout;
|
||||
ret = osd_finalize_request(or, 0, credential, NULL);
|
||||
if (ret) {
|
||||
EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = osd_execute_request(or);
|
||||
|
||||
if (ret)
|
||||
EXOFS_DBGMSG("osd_execute_request() => %d\n", ret);
|
||||
/* osd_req_decode_sense(or, ret); */
|
||||
return ret;
|
||||
}
|
||||
|
||||
/*
|
||||
* Perform an asynchronous OSD operation.
|
||||
*/
|
||||
int exofs_async_op(struct osd_request *or, osd_req_done_fn *async_done,
|
||||
void *caller_context, u8 *cred)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = osd_finalize_request(or, 0, cred, NULL);
|
||||
if (ret) {
|
||||
EXOFS_DBGMSG("Faild to osd_finalize_request() => %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
ret = osd_execute_request_async(or, async_done, caller_context);
|
||||
|
||||
if (ret)
|
||||
EXOFS_DBGMSG("osd_execute_request_async() => %d\n", ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
int extract_attr_from_req(struct osd_request *or, struct osd_attr *attr)
|
||||
{
|
||||
struct osd_attr cur_attr = {.attr_page = 0}; /* start with zeros */
|
||||
void *iter = NULL;
|
||||
int nelem;
|
||||
|
||||
do {
|
||||
nelem = 1;
|
||||
osd_req_decode_get_attr_list(or, &cur_attr, &nelem, &iter);
|
||||
if ((cur_attr.attr_page == attr->attr_page) &&
|
||||
(cur_attr.attr_id == attr->attr_id)) {
|
||||
attr->len = cur_attr.len;
|
||||
attr->val_ptr = cur_attr.val_ptr;
|
||||
return 0;
|
||||
}
|
||||
} while (iter);
|
||||
|
||||
return -EIO;
|
||||
}
|
||||
|
||||
int osd_req_read_kern(struct osd_request *or,
|
||||
const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
|
||||
{
|
||||
struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
|
||||
struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
|
||||
|
||||
if (!bio)
|
||||
return -ENOMEM;
|
||||
|
||||
osd_req_read(or, obj, bio, offset);
|
||||
return 0;
|
||||
}
|
||||
|
||||
int osd_req_write_kern(struct osd_request *or,
|
||||
const struct osd_obj_id *obj, u64 offset, void* buff, u64 len)
|
||||
{
|
||||
struct request_queue *req_q = or->osd_dev->scsi_device->request_queue;
|
||||
struct bio *bio = bio_map_kern(req_q, buff, len, GFP_KERNEL);
|
||||
|
||||
if (!bio)
|
||||
return -ENOMEM;
|
||||
|
||||
osd_req_write(or, obj, bio, offset);
|
||||
return 0;
|
||||
}
|
584
fs/exofs/super.c
Normal file
584
fs/exofs/super.c
Normal file
|
@ -0,0 +1,584 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include <linux/string.h>
|
||||
#include <linux/parser.h>
|
||||
#include <linux/vfs.h>
|
||||
#include <linux/random.h>
|
||||
#include <linux/exportfs.h>
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
/******************************************************************************
|
||||
* MOUNT OPTIONS
|
||||
*****************************************************************************/
|
||||
|
||||
/*
|
||||
* struct to hold what we get from mount options
|
||||
*/
|
||||
struct exofs_mountopt {
|
||||
const char *dev_name;
|
||||
uint64_t pid;
|
||||
int timeout;
|
||||
};
|
||||
|
||||
/*
|
||||
* exofs-specific mount-time options.
|
||||
*/
|
||||
enum { Opt_pid, Opt_to, Opt_mkfs, Opt_format, Opt_err };
|
||||
|
||||
/*
|
||||
* Our mount-time options. These should ideally be 64-bit unsigned, but the
|
||||
* kernel's parsing functions do not currently support that. 32-bit should be
|
||||
* sufficient for most applications now.
|
||||
*/
|
||||
static match_table_t tokens = {
|
||||
{Opt_pid, "pid=%u"},
|
||||
{Opt_to, "to=%u"},
|
||||
{Opt_err, NULL}
|
||||
};
|
||||
|
||||
/*
|
||||
* The main option parsing method. Also makes sure that all of the mandatory
|
||||
* mount options were set.
|
||||
*/
|
||||
static int parse_options(char *options, struct exofs_mountopt *opts)
|
||||
{
|
||||
char *p;
|
||||
substring_t args[MAX_OPT_ARGS];
|
||||
int option;
|
||||
bool s_pid = false;
|
||||
|
||||
EXOFS_DBGMSG("parse_options %s\n", options);
|
||||
/* defaults */
|
||||
memset(opts, 0, sizeof(*opts));
|
||||
opts->timeout = BLK_DEFAULT_SG_TIMEOUT;
|
||||
|
||||
while ((p = strsep(&options, ",")) != NULL) {
|
||||
int token;
|
||||
char str[32];
|
||||
|
||||
if (!*p)
|
||||
continue;
|
||||
|
||||
token = match_token(p, tokens, args);
|
||||
switch (token) {
|
||||
case Opt_pid:
|
||||
if (0 == match_strlcpy(str, &args[0], sizeof(str)))
|
||||
return -EINVAL;
|
||||
opts->pid = simple_strtoull(str, NULL, 0);
|
||||
if (opts->pid < EXOFS_MIN_PID) {
|
||||
EXOFS_ERR("Partition ID must be >= %u",
|
||||
EXOFS_MIN_PID);
|
||||
return -EINVAL;
|
||||
}
|
||||
s_pid = 1;
|
||||
break;
|
||||
case Opt_to:
|
||||
if (match_int(&args[0], &option))
|
||||
return -EINVAL;
|
||||
if (option <= 0) {
|
||||
EXOFS_ERR("Timout must be > 0");
|
||||
return -EINVAL;
|
||||
}
|
||||
opts->timeout = option * HZ;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
if (!s_pid) {
|
||||
EXOFS_ERR("Need to specify the following options:\n");
|
||||
EXOFS_ERR(" -o pid=pid_no_to_use\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
* INODE CACHE
|
||||
*****************************************************************************/
|
||||
|
||||
/*
|
||||
* Our inode cache. Isn't it pretty?
|
||||
*/
|
||||
static struct kmem_cache *exofs_inode_cachep;
|
||||
|
||||
/*
|
||||
* Allocate an inode in the cache
|
||||
*/
|
||||
static struct inode *exofs_alloc_inode(struct super_block *sb)
|
||||
{
|
||||
struct exofs_i_info *oi;
|
||||
|
||||
oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL);
|
||||
if (!oi)
|
||||
return NULL;
|
||||
|
||||
oi->vfs_inode.i_version = 1;
|
||||
return &oi->vfs_inode;
|
||||
}
|
||||
|
||||
/*
|
||||
* Remove an inode from the cache
|
||||
*/
|
||||
static void exofs_destroy_inode(struct inode *inode)
|
||||
{
|
||||
kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
|
||||
}
|
||||
|
||||
/*
|
||||
* Initialize the inode
|
||||
*/
|
||||
static void exofs_init_once(void *foo)
|
||||
{
|
||||
struct exofs_i_info *oi = foo;
|
||||
|
||||
inode_init_once(&oi->vfs_inode);
|
||||
}
|
||||
|
||||
/*
|
||||
* Create and initialize the inode cache
|
||||
*/
|
||||
static int init_inodecache(void)
|
||||
{
|
||||
exofs_inode_cachep = kmem_cache_create("exofs_inode_cache",
|
||||
sizeof(struct exofs_i_info), 0,
|
||||
SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD,
|
||||
exofs_init_once);
|
||||
if (exofs_inode_cachep == NULL)
|
||||
return -ENOMEM;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Destroy the inode cache
|
||||
*/
|
||||
static void destroy_inodecache(void)
|
||||
{
|
||||
kmem_cache_destroy(exofs_inode_cachep);
|
||||
}
|
||||
|
||||
/******************************************************************************
|
||||
* SUPERBLOCK FUNCTIONS
|
||||
*****************************************************************************/
|
||||
static const struct super_operations exofs_sops;
|
||||
static const struct export_operations exofs_export_ops;
|
||||
|
||||
/*
|
||||
* Write the superblock to the OSD
|
||||
*/
|
||||
static void exofs_write_super(struct super_block *sb)
|
||||
{
|
||||
struct exofs_sb_info *sbi;
|
||||
struct exofs_fscb *fscb;
|
||||
struct osd_request *or;
|
||||
struct osd_obj_id obj;
|
||||
int ret;
|
||||
|
||||
fscb = kzalloc(sizeof(struct exofs_fscb), GFP_KERNEL);
|
||||
if (!fscb) {
|
||||
EXOFS_ERR("exofs_write_super: memory allocation failed.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
lock_kernel();
|
||||
sbi = sb->s_fs_info;
|
||||
fscb->s_nextid = cpu_to_le64(sbi->s_nextid);
|
||||
fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles);
|
||||
fscb->s_magic = cpu_to_le16(sb->s_magic);
|
||||
fscb->s_newfs = 0;
|
||||
|
||||
or = osd_start_request(sbi->s_dev, GFP_KERNEL);
|
||||
if (unlikely(!or)) {
|
||||
EXOFS_ERR("exofs_write_super: osd_start_request failed.\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
obj.partition = sbi->s_pid;
|
||||
obj.id = EXOFS_SUPER_ID;
|
||||
ret = osd_req_write_kern(or, &obj, 0, fscb, sizeof(*fscb));
|
||||
if (unlikely(ret)) {
|
||||
EXOFS_ERR("exofs_write_super: osd_req_write_kern failed.\n");
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = exofs_sync_op(or, sbi->s_timeout, sbi->s_cred);
|
||||
if (unlikely(ret)) {
|
||||
EXOFS_ERR("exofs_write_super: exofs_sync_op failed.\n");
|
||||
goto out;
|
||||
}
|
||||
sb->s_dirt = 0;
|
||||
|
||||
out:
|
||||
if (or)
|
||||
osd_end_request(or);
|
||||
unlock_kernel();
|
||||
kfree(fscb);
|
||||
}
|
||||
|
||||
/*
|
||||
* This function is called when the vfs is freeing the superblock. We just
|
||||
* need to free our own part.
|
||||
*/
|
||||
static void exofs_put_super(struct super_block *sb)
|
||||
{
|
||||
int num_pend;
|
||||
struct exofs_sb_info *sbi = sb->s_fs_info;
|
||||
|
||||
/* make sure there are no pending commands */
|
||||
for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0;
|
||||
num_pend = atomic_read(&sbi->s_curr_pending)) {
|
||||
wait_queue_head_t wq;
|
||||
init_waitqueue_head(&wq);
|
||||
wait_event_timeout(wq,
|
||||
(atomic_read(&sbi->s_curr_pending) == 0),
|
||||
msecs_to_jiffies(100));
|
||||
}
|
||||
|
||||
osduld_put_device(sbi->s_dev);
|
||||
kfree(sb->s_fs_info);
|
||||
sb->s_fs_info = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Read the superblock from the OSD and fill in the fields
|
||||
*/
|
||||
static int exofs_fill_super(struct super_block *sb, void *data, int silent)
|
||||
{
|
||||
struct inode *root;
|
||||
struct exofs_mountopt *opts = data;
|
||||
struct exofs_sb_info *sbi; /*extended info */
|
||||
struct exofs_fscb fscb; /*on-disk superblock info */
|
||||
struct osd_request *or = NULL;
|
||||
struct osd_obj_id obj;
|
||||
int ret;
|
||||
|
||||
sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
|
||||
if (!sbi)
|
||||
return -ENOMEM;
|
||||
sb->s_fs_info = sbi;
|
||||
|
||||
/* use mount options to fill superblock */
|
||||
sbi->s_dev = osduld_path_lookup(opts->dev_name);
|
||||
if (IS_ERR(sbi->s_dev)) {
|
||||
ret = PTR_ERR(sbi->s_dev);
|
||||
sbi->s_dev = NULL;
|
||||
goto free_sbi;
|
||||
}
|
||||
|
||||
sbi->s_pid = opts->pid;
|
||||
sbi->s_timeout = opts->timeout;
|
||||
|
||||
/* fill in some other data by hand */
|
||||
memset(sb->s_id, 0, sizeof(sb->s_id));
|
||||
strcpy(sb->s_id, "exofs");
|
||||
sb->s_blocksize = EXOFS_BLKSIZE;
|
||||
sb->s_blocksize_bits = EXOFS_BLKSHIFT;
|
||||
sb->s_maxbytes = MAX_LFS_FILESIZE;
|
||||
atomic_set(&sbi->s_curr_pending, 0);
|
||||
sb->s_bdev = NULL;
|
||||
sb->s_dev = 0;
|
||||
|
||||
/* read data from on-disk superblock object */
|
||||
obj.partition = sbi->s_pid;
|
||||
obj.id = EXOFS_SUPER_ID;
|
||||
exofs_make_credential(sbi->s_cred, &obj);
|
||||
|
||||
or = osd_start_request(sbi->s_dev, GFP_KERNEL);
|
||||
if (unlikely(!or)) {
|
||||
if (!silent)
|
||||
EXOFS_ERR(
|
||||
"exofs_fill_super: osd_start_request failed.\n");
|
||||
ret = -ENOMEM;
|
||||
goto free_sbi;
|
||||
}
|
||||
ret = osd_req_read_kern(or, &obj, 0, &fscb, sizeof(fscb));
|
||||
if (unlikely(ret)) {
|
||||
if (!silent)
|
||||
EXOFS_ERR(
|
||||
"exofs_fill_super: osd_req_read_kern failed.\n");
|
||||
ret = -ENOMEM;
|
||||
goto free_sbi;
|
||||
}
|
||||
|
||||
ret = exofs_sync_op(or, sbi->s_timeout, sbi->s_cred);
|
||||
if (unlikely(ret)) {
|
||||
if (!silent)
|
||||
EXOFS_ERR("exofs_fill_super: exofs_sync_op failed.\n");
|
||||
ret = -EIO;
|
||||
goto free_sbi;
|
||||
}
|
||||
|
||||
sb->s_magic = le16_to_cpu(fscb.s_magic);
|
||||
sbi->s_nextid = le64_to_cpu(fscb.s_nextid);
|
||||
sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles);
|
||||
|
||||
/* make sure what we read from the object store is correct */
|
||||
if (sb->s_magic != EXOFS_SUPER_MAGIC) {
|
||||
if (!silent)
|
||||
EXOFS_ERR("ERROR: Bad magic value\n");
|
||||
ret = -EINVAL;
|
||||
goto free_sbi;
|
||||
}
|
||||
|
||||
/* start generation numbers from a random point */
|
||||
get_random_bytes(&sbi->s_next_generation, sizeof(u32));
|
||||
spin_lock_init(&sbi->s_next_gen_lock);
|
||||
|
||||
/* set up operation vectors */
|
||||
sb->s_op = &exofs_sops;
|
||||
sb->s_export_op = &exofs_export_ops;
|
||||
root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF);
|
||||
if (IS_ERR(root)) {
|
||||
EXOFS_ERR("ERROR: exofs_iget failed\n");
|
||||
ret = PTR_ERR(root);
|
||||
goto free_sbi;
|
||||
}
|
||||
sb->s_root = d_alloc_root(root);
|
||||
if (!sb->s_root) {
|
||||
iput(root);
|
||||
EXOFS_ERR("ERROR: get root inode failed\n");
|
||||
ret = -ENOMEM;
|
||||
goto free_sbi;
|
||||
}
|
||||
|
||||
if (!S_ISDIR(root->i_mode)) {
|
||||
dput(sb->s_root);
|
||||
sb->s_root = NULL;
|
||||
EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n",
|
||||
root->i_mode);
|
||||
ret = -EINVAL;
|
||||
goto free_sbi;
|
||||
}
|
||||
|
||||
ret = 0;
|
||||
out:
|
||||
if (or)
|
||||
osd_end_request(or);
|
||||
return ret;
|
||||
|
||||
free_sbi:
|
||||
osduld_put_device(sbi->s_dev); /* NULL safe */
|
||||
kfree(sbi);
|
||||
goto out;
|
||||
}
|
||||
|
||||
/*
|
||||
* Set up the superblock (calls exofs_fill_super eventually)
|
||||
*/
|
||||
static int exofs_get_sb(struct file_system_type *type,
|
||||
int flags, const char *dev_name,
|
||||
void *data, struct vfsmount *mnt)
|
||||
{
|
||||
struct exofs_mountopt opts;
|
||||
int ret;
|
||||
|
||||
ret = parse_options(data, &opts);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
opts.dev_name = dev_name;
|
||||
return get_sb_nodev(type, flags, &opts, exofs_fill_super, mnt);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return information about the file system state in the buffer. This is used
|
||||
* by the 'df' command, for example.
|
||||
*/
|
||||
static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
||||
{
|
||||
struct super_block *sb = dentry->d_sb;
|
||||
struct exofs_sb_info *sbi = sb->s_fs_info;
|
||||
struct osd_obj_id obj = {sbi->s_pid, 0};
|
||||
struct osd_attr attrs[] = {
|
||||
ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS,
|
||||
OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)),
|
||||
ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION,
|
||||
OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)),
|
||||
};
|
||||
uint64_t capacity = ULLONG_MAX;
|
||||
uint64_t used = ULLONG_MAX;
|
||||
struct osd_request *or;
|
||||
uint8_t cred_a[OSD_CAP_LEN];
|
||||
int ret;
|
||||
|
||||
/* get used/capacity attributes */
|
||||
exofs_make_credential(cred_a, &obj);
|
||||
|
||||
or = osd_start_request(sbi->s_dev, GFP_KERNEL);
|
||||
if (unlikely(!or)) {
|
||||
EXOFS_DBGMSG("exofs_statfs: osd_start_request failed.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
osd_req_get_attributes(or, &obj);
|
||||
osd_req_add_get_attr_list(or, attrs, ARRAY_SIZE(attrs));
|
||||
ret = exofs_sync_op(or, sbi->s_timeout, cred_a);
|
||||
if (unlikely(ret))
|
||||
goto out;
|
||||
|
||||
ret = extract_attr_from_req(or, &attrs[0]);
|
||||
if (likely(!ret))
|
||||
capacity = get_unaligned_be64(attrs[0].val_ptr);
|
||||
else
|
||||
EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n");
|
||||
|
||||
ret = extract_attr_from_req(or, &attrs[1]);
|
||||
if (likely(!ret))
|
||||
used = get_unaligned_be64(attrs[1].val_ptr);
|
||||
else
|
||||
EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n");
|
||||
|
||||
/* fill in the stats buffer */
|
||||
buf->f_type = EXOFS_SUPER_MAGIC;
|
||||
buf->f_bsize = EXOFS_BLKSIZE;
|
||||
buf->f_blocks = (capacity >> EXOFS_BLKSHIFT);
|
||||
buf->f_bfree = ((capacity - used) >> EXOFS_BLKSHIFT);
|
||||
buf->f_bavail = buf->f_bfree;
|
||||
buf->f_files = sbi->s_numfiles;
|
||||
buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles;
|
||||
buf->f_namelen = EXOFS_NAME_LEN;
|
||||
|
||||
out:
|
||||
osd_end_request(or);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct super_operations exofs_sops = {
|
||||
.alloc_inode = exofs_alloc_inode,
|
||||
.destroy_inode = exofs_destroy_inode,
|
||||
.write_inode = exofs_write_inode,
|
||||
.delete_inode = exofs_delete_inode,
|
||||
.put_super = exofs_put_super,
|
||||
.write_super = exofs_write_super,
|
||||
.statfs = exofs_statfs,
|
||||
};
|
||||
|
||||
/******************************************************************************
|
||||
* EXPORT OPERATIONS
|
||||
*****************************************************************************/
|
||||
|
||||
struct dentry *exofs_get_parent(struct dentry *child)
|
||||
{
|
||||
unsigned long ino = exofs_parent_ino(child);
|
||||
|
||||
if (!ino)
|
||||
return NULL;
|
||||
|
||||
return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino));
|
||||
}
|
||||
|
||||
static struct inode *exofs_nfs_get_inode(struct super_block *sb,
|
||||
u64 ino, u32 generation)
|
||||
{
|
||||
struct inode *inode;
|
||||
|
||||
inode = exofs_iget(sb, ino);
|
||||
if (IS_ERR(inode))
|
||||
return ERR_CAST(inode);
|
||||
if (generation && inode->i_generation != generation) {
|
||||
/* we didn't find the right inode.. */
|
||||
iput(inode);
|
||||
return ERR_PTR(-ESTALE);
|
||||
}
|
||||
return inode;
|
||||
}
|
||||
|
||||
static struct dentry *exofs_fh_to_dentry(struct super_block *sb,
|
||||
struct fid *fid, int fh_len, int fh_type)
|
||||
{
|
||||
return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
|
||||
exofs_nfs_get_inode);
|
||||
}
|
||||
|
||||
static struct dentry *exofs_fh_to_parent(struct super_block *sb,
|
||||
struct fid *fid, int fh_len, int fh_type)
|
||||
{
|
||||
return generic_fh_to_parent(sb, fid, fh_len, fh_type,
|
||||
exofs_nfs_get_inode);
|
||||
}
|
||||
|
||||
static const struct export_operations exofs_export_ops = {
|
||||
.fh_to_dentry = exofs_fh_to_dentry,
|
||||
.fh_to_parent = exofs_fh_to_parent,
|
||||
.get_parent = exofs_get_parent,
|
||||
};
|
||||
|
||||
/******************************************************************************
|
||||
* INSMOD/RMMOD
|
||||
*****************************************************************************/
|
||||
|
||||
/*
|
||||
* struct that describes this file system
|
||||
*/
|
||||
static struct file_system_type exofs_type = {
|
||||
.owner = THIS_MODULE,
|
||||
.name = "exofs",
|
||||
.get_sb = exofs_get_sb,
|
||||
.kill_sb = generic_shutdown_super,
|
||||
};
|
||||
|
||||
static int __init init_exofs(void)
|
||||
{
|
||||
int err;
|
||||
|
||||
err = init_inodecache();
|
||||
if (err)
|
||||
goto out;
|
||||
|
||||
err = register_filesystem(&exofs_type);
|
||||
if (err)
|
||||
goto out_d;
|
||||
|
||||
return 0;
|
||||
out_d:
|
||||
destroy_inodecache();
|
||||
out:
|
||||
return err;
|
||||
}
|
||||
|
||||
static void __exit exit_exofs(void)
|
||||
{
|
||||
unregister_filesystem(&exofs_type);
|
||||
destroy_inodecache();
|
||||
}
|
||||
|
||||
MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>");
|
||||
MODULE_DESCRIPTION("exofs");
|
||||
MODULE_LICENSE("GPL");
|
||||
|
||||
module_init(init_exofs)
|
||||
module_exit(exit_exofs)
|
57
fs/exofs/symlink.c
Normal file
57
fs/exofs/symlink.c
Normal file
|
@ -0,0 +1,57 @@
|
|||
/*
|
||||
* Copyright (C) 2005, 2006
|
||||
* Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com)
|
||||
* Copyright (C) 2005, 2006
|
||||
* International Business Machines
|
||||
* Copyright (C) 2008, 2009
|
||||
* Boaz Harrosh <bharrosh@panasas.com>
|
||||
*
|
||||
* 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
|
||||
*/
|
||||
|
||||
#include <linux/namei.h>
|
||||
|
||||
#include "exofs.h"
|
||||
|
||||
static void *exofs_follow_link(struct dentry *dentry, struct nameidata *nd)
|
||||
{
|
||||
struct exofs_i_info *oi = exofs_i(dentry->d_inode);
|
||||
|
||||
nd_set_link(nd, (char *)oi->i_data);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
const struct inode_operations exofs_symlink_inode_operations = {
|
||||
.readlink = generic_readlink,
|
||||
.follow_link = page_follow_link_light,
|
||||
.put_link = page_put_link,
|
||||
};
|
||||
|
||||
const struct inode_operations exofs_fast_symlink_inode_operations = {
|
||||
.readlink = generic_readlink,
|
||||
.follow_link = exofs_follow_link,
|
||||
};
|
Loading…
Reference in a new issue