--- /dev/null
+===============================================================================
+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.
source "fs/sysv/Kconfig"
source "fs/ufs/Kconfig"
+source "fs/exofs/Kconfig"
+
endif # MISC_FILESYSTEMS
menuconfig NETWORK_FILESYSTEMS
obj-$(CONFIG_OCFS2_FS) += ocfs2/
obj-$(CONFIG_BTRFS_FS) += btrfs/
obj-$(CONFIG_GFS2_FS) += gfs2/
+obj-$(CONFIG_EXOFS_FS) += exofs/
--- /dev/null
+- 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.
--- /dev/null
+#
+# 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
--- /dev/null
+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.
--- /dev/null
+/*
+ * 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__*/
--- /dev/null
+/*
+ * 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,
+};
--- /dev/null
+/*
+ * 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
--- /dev/null
+/*
+ * 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,
+};
--- /dev/null
+/*
+ * 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/writeback.h>
+#include <linux/buffer_head.h>
+#include <scsi/scsi_device.h>
+
+#include "exofs.h"
+
+#ifdef CONFIG_EXOFS_DEBUG
+# define EXOFS_DEBUG_OBJ_ISIZE 1
+#endif
+
+struct page_collect {
+ struct exofs_sb_info *sbi;
+ struct request_queue *req_q;
+ struct inode *inode;
+ unsigned expected_pages;
+
+ struct bio *bio;
+ unsigned nr_pages;
+ unsigned long length;
+ loff_t pg_first; /* keep 64bit also in 32-arches */
+};
+
+static void _pcol_init(struct page_collect *pcol, unsigned expected_pages,
+ struct inode *inode)
+{
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ struct request_queue *req_q = sbi->s_dev->scsi_device->request_queue;
+
+ pcol->sbi = sbi;
+ pcol->req_q = req_q;
+ pcol->inode = inode;
+ pcol->expected_pages = expected_pages;
+
+ pcol->bio = NULL;
+ pcol->nr_pages = 0;
+ pcol->length = 0;
+ pcol->pg_first = -1;
+
+ EXOFS_DBGMSG("_pcol_init ino=0x%lx expected_pages=%u\n", inode->i_ino,
+ expected_pages);
+}
+
+static void _pcol_reset(struct page_collect *pcol)
+{
+ pcol->expected_pages -= min(pcol->nr_pages, pcol->expected_pages);
+
+ pcol->bio = NULL;
+ pcol->nr_pages = 0;
+ pcol->length = 0;
+ pcol->pg_first = -1;
+ EXOFS_DBGMSG("_pcol_reset ino=0x%lx expected_pages=%u\n",
+ pcol->inode->i_ino, pcol->expected_pages);
+
+ /* this is probably the end of the loop but in writes
+ * it might not end here. don't be left with nothing
+ */
+ if (!pcol->expected_pages)
+ pcol->expected_pages = 128;
+}
+
+static int pcol_try_alloc(struct page_collect *pcol)
+{
+ int pages = min_t(unsigned, pcol->expected_pages, BIO_MAX_PAGES);
+
+ for (; pages; pages >>= 1) {
+ pcol->bio = bio_alloc(GFP_KERNEL, pages);
+ if (likely(pcol->bio))
+ return 0;
+ }
+
+ EXOFS_ERR("Failed to kcalloc expected_pages=%u\n",
+ pcol->expected_pages);
+ return -ENOMEM;
+}
+
+static void pcol_free(struct page_collect *pcol)
+{
+ bio_put(pcol->bio);
+ pcol->bio = NULL;
+}
+
+static int pcol_add_page(struct page_collect *pcol, struct page *page,
+ unsigned len)
+{
+ int added_len = bio_add_pc_page(pcol->req_q, pcol->bio, page, len, 0);
+ if (unlikely(len != added_len))
+ return -ENOMEM;
+
+ ++pcol->nr_pages;
+ pcol->length += len;
+ return 0;
+}
+
+static int update_read_page(struct page *page, int ret)
+{
+ if (ret == 0) {
+ /* Everything is OK */
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+ } else if (ret == -EFAULT) {
+ /* In this case we were trying to read something that wasn't on
+ * disk yet - return a page full of zeroes. This should be OK,
+ * because the object should be empty (if there was a write
+ * before this read, the read would be waiting with the page
+ * locked */
+ clear_highpage(page);
+
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+ ret = 0; /* recovered error */
+ EXOFS_DBGMSG("recovered read error\n");
+ } else /* Error */
+ SetPageError(page);
+
+ return ret;
+}
+
+static void update_write_page(struct page *page, int ret)
+{
+ if (ret) {
+ mapping_set_error(page->mapping, ret);
+ SetPageError(page);
+ }
+ end_page_writeback(page);
+}
+
+/* Called at the end of reads, to optionally unlock pages and update their
+ * status.
+ */
+static int __readpages_done(struct osd_request *or, struct page_collect *pcol,
+ bool do_unlock)
+{
+ struct bio_vec *bvec;
+ int i;
+ u64 resid;
+ u64 good_bytes;
+ u64 length = 0;
+ int ret = exofs_check_ok_resid(or, &resid, NULL);
+
+ osd_end_request(or);
+
+ if (likely(!ret))
+ good_bytes = pcol->length;
+ else if (!resid)
+ good_bytes = 0;
+ else
+ good_bytes = pcol->length - resid;
+
+ EXOFS_DBGMSG("readpages_done(0x%lx) good_bytes=0x%llx"
+ " length=0x%lx nr_pages=%u\n",
+ pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
+ pcol->nr_pages);
+
+ __bio_for_each_segment(bvec, pcol->bio, i, 0) {
+ struct page *page = bvec->bv_page;
+ struct inode *inode = page->mapping->host;
+ int page_stat;
+
+ if (inode != pcol->inode)
+ continue; /* osd might add more pages at end */
+
+ if (likely(length < good_bytes))
+ page_stat = 0;
+ else
+ page_stat = ret;
+
+ EXOFS_DBGMSG(" readpages_done(0x%lx, 0x%lx) %s\n",
+ inode->i_ino, page->index,
+ page_stat ? "bad_bytes" : "good_bytes");
+
+ ret = update_read_page(page, page_stat);
+ if (do_unlock)
+ unlock_page(page);
+ length += bvec->bv_len;
+ }
+
+ pcol_free(pcol);
+ EXOFS_DBGMSG("readpages_done END\n");
+ return ret;
+}
+
+/* callback of async reads */
+static void readpages_done(struct osd_request *or, void *p)
+{
+ struct page_collect *pcol = p;
+
+ __readpages_done(or, pcol, true);
+ atomic_dec(&pcol->sbi->s_curr_pending);
+ kfree(p);
+}
+
+static void _unlock_pcol_pages(struct page_collect *pcol, int ret, int rw)
+{
+ struct bio_vec *bvec;
+ int i;
+
+ __bio_for_each_segment(bvec, pcol->bio, i, 0) {
+ struct page *page = bvec->bv_page;
+
+ if (rw == READ)
+ update_read_page(page, ret);
+ else
+ update_write_page(page, ret);
+
+ unlock_page(page);
+ }
+ pcol_free(pcol);
+}
+
+static int read_exec(struct page_collect *pcol, bool is_sync)
+{
+ struct exofs_i_info *oi = exofs_i(pcol->inode);
+ struct osd_obj_id obj = {pcol->sbi->s_pid,
+ pcol->inode->i_ino + EXOFS_OBJ_OFF};
+ struct osd_request *or = NULL;
+ struct page_collect *pcol_copy = NULL;
+ loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
+ int ret;
+
+ if (!pcol->bio)
+ return 0;
+
+ /* see comment in _readpage() about sync reads */
+ WARN_ON(is_sync && (pcol->nr_pages != 1));
+
+ or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ osd_req_read(or, &obj, pcol->bio, i_start);
+
+ if (is_sync) {
+ exofs_sync_op(or, pcol->sbi->s_timeout, oi->i_cred);
+ return __readpages_done(or, pcol, false);
+ }
+
+ pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
+ if (!pcol_copy) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ *pcol_copy = *pcol;
+ ret = exofs_async_op(or, readpages_done, pcol_copy, oi->i_cred);
+ if (unlikely(ret))
+ goto err;
+
+ atomic_inc(&pcol->sbi->s_curr_pending);
+
+ EXOFS_DBGMSG("read_exec obj=0x%llx start=0x%llx length=0x%lx\n",
+ obj.id, _LLU(i_start), pcol->length);
+
+ /* pages ownership was passed to pcol_copy */
+ _pcol_reset(pcol);
+ return 0;
+
+err:
+ if (!is_sync)
+ _unlock_pcol_pages(pcol, ret, READ);
+ kfree(pcol_copy);
+ if (or)
+ osd_end_request(or);
+ return ret;
+}
+
+/* readpage_strip is called either directly from readpage() or by the VFS from
+ * within read_cache_pages(), to add one more page to be read. It will try to
+ * collect as many contiguous pages as posible. If a discontinuity is
+ * encountered, or it runs out of resources, it will submit the previous segment
+ * and will start a new collection. Eventually caller must submit the last
+ * segment if present.
+ */
+static int readpage_strip(void *data, struct page *page)
+{
+ struct page_collect *pcol = data;
+ struct inode *inode = pcol->inode;
+ struct exofs_i_info *oi = exofs_i(inode);
+ loff_t i_size = i_size_read(inode);
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ size_t len;
+ int ret;
+
+ /* FIXME: Just for debugging, will be removed */
+ if (PageUptodate(page))
+ EXOFS_ERR("PageUptodate(0x%lx, 0x%lx)\n", pcol->inode->i_ino,
+ page->index);
+
+ if (page->index < end_index)
+ len = PAGE_CACHE_SIZE;
+ else if (page->index == end_index)
+ len = i_size & ~PAGE_CACHE_MASK;
+ else
+ len = 0;
+
+ if (!len || !obj_created(oi)) {
+ /* this will be out of bounds, or doesn't exist yet.
+ * Current page is cleared and the request is split
+ */
+ clear_highpage(page);
+
+ SetPageUptodate(page);
+ if (PageError(page))
+ ClearPageError(page);
+
+ unlock_page(page);
+ EXOFS_DBGMSG("readpage_strip(0x%lx, 0x%lx) empty page,"
+ " splitting\n", inode->i_ino, page->index);
+
+ return read_exec(pcol, false);
+ }
+
+try_again:
+
+ if (unlikely(pcol->pg_first == -1)) {
+ pcol->pg_first = page->index;
+ } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
+ page->index)) {
+ /* Discontinuity detected, split the request */
+ ret = read_exec(pcol, false);
+ if (unlikely(ret))
+ goto fail;
+ goto try_again;
+ }
+
+ if (!pcol->bio) {
+ ret = pcol_try_alloc(pcol);
+ if (unlikely(ret))
+ goto fail;
+ }
+
+ if (len != PAGE_CACHE_SIZE)
+ zero_user(page, len, PAGE_CACHE_SIZE - len);
+
+ EXOFS_DBGMSG(" readpage_strip(0x%lx, 0x%lx) len=0x%zx\n",
+ inode->i_ino, page->index, len);
+
+ ret = pcol_add_page(pcol, page, len);
+ if (ret) {
+ EXOFS_DBGMSG("Failed pcol_add_page pages[i]=%p "
+ "this_len=0x%zx nr_pages=%u length=0x%lx\n",
+ page, len, pcol->nr_pages, pcol->length);
+
+ /* split the request, and start again with current page */
+ ret = read_exec(pcol, false);
+ if (unlikely(ret))
+ goto fail;
+
+ goto try_again;
+ }
+
+ return 0;
+
+fail:
+ /* SetPageError(page); ??? */
+ unlock_page(page);
+ return ret;
+}
+
+static int exofs_readpages(struct file *file, struct address_space *mapping,
+ struct list_head *pages, unsigned nr_pages)
+{
+ struct page_collect pcol;
+ int ret;
+
+ _pcol_init(&pcol, nr_pages, mapping->host);
+
+ ret = read_cache_pages(mapping, pages, readpage_strip, &pcol);
+ if (ret) {
+ EXOFS_ERR("read_cache_pages => %d\n", ret);
+ return ret;
+ }
+
+ return read_exec(&pcol, false);
+}
+
+static int _readpage(struct page *page, bool is_sync)
+{
+ struct page_collect pcol;
+ int ret;
+
+ _pcol_init(&pcol, 1, page->mapping->host);
+
+ /* readpage_strip might call read_exec(,async) inside at several places
+ * but this is safe for is_async=0 since read_exec will not do anything
+ * when we have a single page.
+ */
+ ret = readpage_strip(&pcol, page);
+ if (ret) {
+ EXOFS_ERR("_readpage => %d\n", ret);
+ return ret;
+ }
+
+ return read_exec(&pcol, is_sync);
+}
+
+/*
+ * We don't need the file
+ */
+static int exofs_readpage(struct file *file, struct page *page)
+{
+ return _readpage(page, false);
+}
+
+/* Callback for osd_write. All writes are asynchronouse */
+static void writepages_done(struct osd_request *or, void *p)
+{
+ struct page_collect *pcol = p;
+ struct bio_vec *bvec;
+ int i;
+ u64 resid;
+ u64 good_bytes;
+ u64 length = 0;
+
+ int ret = exofs_check_ok_resid(or, NULL, &resid);
+
+ osd_end_request(or);
+ atomic_dec(&pcol->sbi->s_curr_pending);
+
+ if (likely(!ret))
+ good_bytes = pcol->length;
+ else if (!resid)
+ good_bytes = 0;
+ else
+ good_bytes = pcol->length - resid;
+
+ EXOFS_DBGMSG("writepages_done(0x%lx) good_bytes=0x%llx"
+ " length=0x%lx nr_pages=%u\n",
+ pcol->inode->i_ino, _LLU(good_bytes), pcol->length,
+ pcol->nr_pages);
+
+ __bio_for_each_segment(bvec, pcol->bio, i, 0) {
+ struct page *page = bvec->bv_page;
+ struct inode *inode = page->mapping->host;
+ int page_stat;
+
+ if (inode != pcol->inode)
+ continue; /* osd might add more pages to a bio */
+
+ if (likely(length < good_bytes))
+ page_stat = 0;
+ else
+ page_stat = ret;
+
+ update_write_page(page, page_stat);
+ unlock_page(page);
+ EXOFS_DBGMSG(" writepages_done(0x%lx, 0x%lx) status=%d\n",
+ inode->i_ino, page->index, page_stat);
+
+ length += bvec->bv_len;
+ }
+
+ pcol_free(pcol);
+ kfree(pcol);
+ EXOFS_DBGMSG("writepages_done END\n");
+}
+
+static int write_exec(struct page_collect *pcol)
+{
+ struct exofs_i_info *oi = exofs_i(pcol->inode);
+ struct osd_obj_id obj = {pcol->sbi->s_pid,
+ pcol->inode->i_ino + EXOFS_OBJ_OFF};
+ struct osd_request *or = NULL;
+ struct page_collect *pcol_copy = NULL;
+ loff_t i_start = pcol->pg_first << PAGE_CACHE_SHIFT;
+ int ret;
+
+ if (!pcol->bio)
+ return 0;
+
+ or = osd_start_request(pcol->sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("write_exec: Faild to osd_start_request()\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ pcol_copy = kmalloc(sizeof(*pcol_copy), GFP_KERNEL);
+ if (!pcol_copy) {
+ EXOFS_ERR("write_exec: Faild to kmalloc(pcol)\n");
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ *pcol_copy = *pcol;
+
+ osd_req_write(or, &obj, pcol_copy->bio, i_start);
+ ret = exofs_async_op(or, writepages_done, pcol_copy, oi->i_cred);
+ if (unlikely(ret)) {
+ EXOFS_ERR("write_exec: exofs_async_op() Faild\n");
+ goto err;
+ }
+
+ atomic_inc(&pcol->sbi->s_curr_pending);
+ EXOFS_DBGMSG("write_exec(0x%lx, 0x%llx) start=0x%llx length=0x%lx\n",
+ pcol->inode->i_ino, pcol->pg_first, _LLU(i_start),
+ pcol->length);
+ /* pages ownership was passed to pcol_copy */
+ _pcol_reset(pcol);
+ return 0;
+
+err:
+ _unlock_pcol_pages(pcol, ret, WRITE);
+ kfree(pcol_copy);
+ if (or)
+ osd_end_request(or);
+ return ret;
+}
+
+/* writepage_strip is called either directly from writepage() or by the VFS from
+ * within write_cache_pages(), to add one more page to be written to storage.
+ * It will try to collect as many contiguous pages as possible. If a
+ * discontinuity is encountered or it runs out of resources it will submit the
+ * previous segment and will start a new collection.
+ * Eventually caller must submit the last segment if present.
+ */
+static int writepage_strip(struct page *page,
+ struct writeback_control *wbc_unused, void *data)
+{
+ struct page_collect *pcol = data;
+ struct inode *inode = pcol->inode;
+ struct exofs_i_info *oi = exofs_i(inode);
+ loff_t i_size = i_size_read(inode);
+ pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
+ size_t len;
+ int ret;
+
+ BUG_ON(!PageLocked(page));
+
+ ret = wait_obj_created(oi);
+ if (unlikely(ret))
+ goto fail;
+
+ if (page->index < end_index)
+ /* in this case, the page is within the limits of the file */
+ len = PAGE_CACHE_SIZE;
+ else {
+ len = i_size & ~PAGE_CACHE_MASK;
+
+ if (page->index > end_index || !len) {
+ /* in this case, the page is outside the limits
+ * (truncate in progress)
+ */
+ ret = write_exec(pcol);
+ if (unlikely(ret))
+ goto fail;
+ if (PageError(page))
+ ClearPageError(page);
+ unlock_page(page);
+ return 0;
+ }
+ }
+
+try_again:
+
+ if (unlikely(pcol->pg_first == -1)) {
+ pcol->pg_first = page->index;
+ } else if (unlikely((pcol->pg_first + pcol->nr_pages) !=
+ page->index)) {
+ /* Discontinuity detected, split the request */
+ ret = write_exec(pcol);
+ if (unlikely(ret))
+ goto fail;
+ goto try_again;
+ }
+
+ if (!pcol->bio) {
+ ret = pcol_try_alloc(pcol);
+ if (unlikely(ret))
+ goto fail;
+ }
+
+ EXOFS_DBGMSG(" writepage_strip(0x%lx, 0x%lx) len=0x%zx\n",
+ inode->i_ino, page->index, len);
+
+ ret = pcol_add_page(pcol, page, len);
+ if (unlikely(ret)) {
+ EXOFS_DBGMSG("Failed pcol_add_page "
+ "nr_pages=%u total_length=0x%lx\n",
+ pcol->nr_pages, pcol->length);
+
+ /* split the request, next loop will start again */
+ ret = write_exec(pcol);
+ if (unlikely(ret)) {
+ EXOFS_DBGMSG("write_exec faild => %d", ret);
+ goto fail;
+ }
+
+ goto try_again;
+ }
+
+ BUG_ON(PageWriteback(page));
+ set_page_writeback(page);
+
+ return 0;
+
+fail:
+ set_bit(AS_EIO, &page->mapping->flags);
+ unlock_page(page);
+ return ret;
+}
+
+static int exofs_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ struct page_collect pcol;
+ long start, end, expected_pages;
+ int ret;
+
+ start = wbc->range_start >> PAGE_CACHE_SHIFT;
+ end = (wbc->range_end == LLONG_MAX) ?
+ start + mapping->nrpages :
+ wbc->range_end >> PAGE_CACHE_SHIFT;
+
+ if (start || end)
+ expected_pages = min(end - start + 1, 32L);
+ else
+ expected_pages = mapping->nrpages;
+
+ EXOFS_DBGMSG("inode(0x%lx) wbc->start=0x%llx wbc->end=0x%llx"
+ " m->nrpages=%lu start=0x%lx end=0x%lx\n",
+ mapping->host->i_ino, wbc->range_start, wbc->range_end,
+ mapping->nrpages, start, end);
+
+ _pcol_init(&pcol, expected_pages, mapping->host);
+
+ ret = write_cache_pages(mapping, wbc, writepage_strip, &pcol);
+ if (ret) {
+ EXOFS_ERR("write_cache_pages => %d\n", ret);
+ return ret;
+ }
+
+ return write_exec(&pcol);
+}
+
+static int exofs_writepage(struct page *page, struct writeback_control *wbc)
+{
+ struct page_collect pcol;
+ int ret;
+
+ _pcol_init(&pcol, 1, page->mapping->host);
+
+ ret = writepage_strip(page, NULL, &pcol);
+ if (ret) {
+ EXOFS_ERR("exofs_writepage => %d\n", ret);
+ return ret;
+ }
+
+ return write_exec(&pcol);
+}
+
+int exofs_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ int ret = 0;
+ struct page *page;
+
+ page = *pagep;
+ if (page == NULL) {
+ ret = simple_write_begin(file, mapping, pos, len, flags, pagep,
+ fsdata);
+ if (ret) {
+ EXOFS_DBGMSG("simple_write_begin faild\n");
+ return ret;
+ }
+
+ page = *pagep;
+ }
+
+ /* read modify write */
+ if (!PageUptodate(page) && (len != PAGE_CACHE_SIZE)) {
+ ret = _readpage(page, true);
+ if (ret) {
+ /*SetPageError was done by _readpage. Is it ok?*/
+ unlock_page(page);
+ EXOFS_DBGMSG("__readpage_filler faild\n");
+ }
+ }
+
+ return ret;
+}
+
+static int exofs_write_begin_export(struct file *file,
+ struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ *pagep = NULL;
+
+ return exofs_write_begin(file, mapping, pos, len, flags, pagep,
+ fsdata);
+}
+
+const struct address_space_operations exofs_aops = {
+ .readpage = exofs_readpage,
+ .readpages = exofs_readpages,
+ .writepage = exofs_writepage,
+ .writepages = exofs_writepages,
+ .write_begin = exofs_write_begin_export,
+ .write_end = simple_write_end,
+};
+
+/******************************************************************************
+ * INODE OPERATIONS
+ *****************************************************************************/
+
+/*
+ * Test whether an inode is a fast symlink.
+ */
+static inline int exofs_inode_is_fast_symlink(struct inode *inode)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+
+ return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0);
+}
+
+/*
+ * get_block_t - Fill in a buffer_head
+ * An OSD takes care of block allocation so we just fake an allocation by
+ * putting in the inode's sector_t in the buffer_head.
+ * TODO: What about the case of create==0 and @iblock does not exist in the
+ * object?
+ */
+static int exofs_get_block(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
+{
+ map_bh(bh_result, inode->i_sb, iblock);
+ return 0;
+}
+
+const struct osd_attr g_attr_logical_length = ATTR_DEF(
+ OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8);
+
+/*
+ * Truncate a file to the specified size - all we have to do is set the size
+ * attribute. We make sure the object exists first.
+ */
+void exofs_truncate(struct inode *inode)
+{
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
+ struct osd_request *or;
+ struct osd_attr attr;
+ loff_t isize = i_size_read(inode);
+ __be64 newsize;
+ int ret;
+
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
+ || S_ISLNK(inode->i_mode)))
+ return;
+ if (exofs_inode_is_fast_symlink(inode))
+ return;
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
+ return;
+ inode->i_mtime = inode->i_ctime = CURRENT_TIME;
+
+ nobh_truncate_page(inode->i_mapping, isize, exofs_get_block);
+
+ or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("ERROR: exofs_truncate: osd_start_request failed\n");
+ goto fail;
+ }
+
+ osd_req_set_attributes(or, &obj);
+
+ newsize = cpu_to_be64((u64)isize);
+ attr = g_attr_logical_length;
+ attr.val_ptr = &newsize;
+ osd_req_add_set_attr_list(or, &attr, 1);
+
+ /* if we are about to truncate an object, and it hasn't been
+ * created yet, wait
+ */
+ if (unlikely(wait_obj_created(oi)))
+ goto fail;
+
+ ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
+ osd_end_request(or);
+ if (ret)
+ goto fail;
+
+out:
+ mark_inode_dirty(inode);
+ return;
+fail:
+ make_bad_inode(inode);
+ goto out;
+}
+
+/*
+ * Set inode attributes - just call generic functions.
+ */
+int exofs_setattr(struct dentry *dentry, struct iattr *iattr)
+{
+ struct inode *inode = dentry->d_inode;
+ int error;
+
+ error = inode_change_ok(inode, iattr);
+ if (error)
+ return error;
+
+ error = inode_setattr(inode, iattr);
+ return error;
+}
+
+/*
+ * Read an inode from the OSD, and return it as is. We also return the size
+ * attribute in the 'sanity' argument if we got compiled with debugging turned
+ * on.
+ */
+static int exofs_get_inode(struct super_block *sb, struct exofs_i_info *oi,
+ struct exofs_fcb *inode, uint64_t *sanity)
+{
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct osd_request *or;
+ struct osd_attr attr;
+ struct osd_obj_id obj = {sbi->s_pid,
+ oi->vfs_inode.i_ino + EXOFS_OBJ_OFF};
+ int ret;
+
+ exofs_make_credential(oi->i_cred, &obj);
+
+ or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("exofs_get_inode: osd_start_request failed.\n");
+ return -ENOMEM;
+ }
+ osd_req_get_attributes(or, &obj);
+
+ /* we need the inode attribute */
+ osd_req_add_get_attr_list(or, &g_attr_inode_data, 1);
+
+#ifdef EXOFS_DEBUG_OBJ_ISIZE
+ /* we get the size attributes to do a sanity check */
+ osd_req_add_get_attr_list(or, &g_attr_logical_length, 1);
+#endif
+
+ ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
+ if (ret)
+ goto out;
+
+ attr = g_attr_inode_data;
+ ret = extract_attr_from_req(or, &attr);
+ if (ret) {
+ EXOFS_ERR("exofs_get_inode: extract_attr_from_req failed\n");
+ goto out;
+ }
+
+ WARN_ON(attr.len != EXOFS_INO_ATTR_SIZE);
+ memcpy(inode, attr.val_ptr, EXOFS_INO_ATTR_SIZE);
+
+#ifdef EXOFS_DEBUG_OBJ_ISIZE
+ attr = g_attr_logical_length;
+ ret = extract_attr_from_req(or, &attr);
+ if (ret) {
+ EXOFS_ERR("ERROR: extract attr from or failed\n");
+ goto out;
+ }
+ *sanity = get_unaligned_be64(attr.val_ptr);
+#endif
+
+out:
+ osd_end_request(or);
+ return ret;
+}
+
+/*
+ * Fill in an inode read from the OSD and set it up for use
+ */
+struct inode *exofs_iget(struct super_block *sb, unsigned long ino)
+{
+ struct exofs_i_info *oi;
+ struct exofs_fcb fcb;
+ struct inode *inode;
+ uint64_t uninitialized_var(sanity);
+ int ret;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+ oi = exofs_i(inode);
+
+ /* read the inode from the osd */
+ ret = exofs_get_inode(sb, oi, &fcb, &sanity);
+ if (ret)
+ goto bad_inode;
+
+ init_waitqueue_head(&oi->i_wq);
+ set_obj_created(oi);
+
+ /* copy stuff from on-disk struct to in-memory struct */
+ inode->i_mode = le16_to_cpu(fcb.i_mode);
+ inode->i_uid = le32_to_cpu(fcb.i_uid);
+ inode->i_gid = le32_to_cpu(fcb.i_gid);
+ inode->i_nlink = le16_to_cpu(fcb.i_links_count);
+ inode->i_ctime.tv_sec = (signed)le32_to_cpu(fcb.i_ctime);
+ inode->i_atime.tv_sec = (signed)le32_to_cpu(fcb.i_atime);
+ inode->i_mtime.tv_sec = (signed)le32_to_cpu(fcb.i_mtime);
+ inode->i_ctime.tv_nsec =
+ inode->i_atime.tv_nsec = inode->i_mtime.tv_nsec = 0;
+ oi->i_commit_size = le64_to_cpu(fcb.i_size);
+ i_size_write(inode, oi->i_commit_size);
+ inode->i_blkbits = EXOFS_BLKSHIFT;
+ inode->i_generation = le32_to_cpu(fcb.i_generation);
+
+#ifdef EXOFS_DEBUG_OBJ_ISIZE
+ if ((inode->i_size != sanity) &&
+ (!exofs_inode_is_fast_symlink(inode))) {
+ EXOFS_ERR("WARNING: Size of object from inode and "
+ "attributes differ (%lld != %llu)\n",
+ inode->i_size, _LLU(sanity));
+ }
+#endif
+
+ oi->i_dir_start_lookup = 0;
+
+ if ((inode->i_nlink == 0) && (inode->i_mode == 0)) {
+ ret = -ESTALE;
+ goto bad_inode;
+ }
+
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+ if (fcb.i_data[0])
+ inode->i_rdev =
+ old_decode_dev(le32_to_cpu(fcb.i_data[0]));
+ else
+ inode->i_rdev =
+ new_decode_dev(le32_to_cpu(fcb.i_data[1]));
+ } else {
+ memcpy(oi->i_data, fcb.i_data, sizeof(fcb.i_data));
+ }
+
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_op = &exofs_file_inode_operations;
+ inode->i_fop = &exofs_file_operations;
+ inode->i_mapping->a_ops = &exofs_aops;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &exofs_dir_inode_operations;
+ inode->i_fop = &exofs_dir_operations;
+ inode->i_mapping->a_ops = &exofs_aops;
+ } else if (S_ISLNK(inode->i_mode)) {
+ if (exofs_inode_is_fast_symlink(inode))
+ inode->i_op = &exofs_fast_symlink_inode_operations;
+ else {
+ inode->i_op = &exofs_symlink_inode_operations;
+ inode->i_mapping->a_ops = &exofs_aops;
+ }
+ } else {
+ inode->i_op = &exofs_special_inode_operations;
+ if (fcb.i_data[0])
+ init_special_inode(inode, inode->i_mode,
+ old_decode_dev(le32_to_cpu(fcb.i_data[0])));
+ else
+ init_special_inode(inode, inode->i_mode,
+ new_decode_dev(le32_to_cpu(fcb.i_data[1])));
+ }
+
+ unlock_new_inode(inode);
+ return inode;
+
+bad_inode:
+ iget_failed(inode);
+ return ERR_PTR(ret);
+}
+
+int __exofs_wait_obj_created(struct exofs_i_info *oi)
+{
+ if (!obj_created(oi)) {
+ BUG_ON(!obj_2bcreated(oi));
+ wait_event(oi->i_wq, obj_created(oi));
+ }
+ return unlikely(is_bad_inode(&oi->vfs_inode)) ? -EIO : 0;
+}
+/*
+ * Callback function from exofs_new_inode(). The important thing is that we
+ * set the obj_created flag so that other methods know that the object exists on
+ * the OSD.
+ */
+static void create_done(struct osd_request *or, void *p)
+{
+ struct inode *inode = p;
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct exofs_sb_info *sbi = inode->i_sb->s_fs_info;
+ int ret;
+
+ ret = exofs_check_ok(or);
+ osd_end_request(or);
+ atomic_dec(&sbi->s_curr_pending);
+
+ if (unlikely(ret)) {
+ EXOFS_ERR("object=0x%llx creation faild in pid=0x%llx",
+ _LLU(sbi->s_pid), _LLU(inode->i_ino + EXOFS_OBJ_OFF));
+ make_bad_inode(inode);
+ } else
+ set_obj_created(oi);
+
+ atomic_dec(&inode->i_count);
+ wake_up(&oi->i_wq);
+}
+
+/*
+ * Set up a new inode and create an object for it on the OSD
+ */
+struct inode *exofs_new_inode(struct inode *dir, int mode)
+{
+ struct super_block *sb;
+ struct inode *inode;
+ struct exofs_i_info *oi;
+ struct exofs_sb_info *sbi;
+ struct osd_request *or;
+ struct osd_obj_id obj;
+ int ret;
+
+ sb = dir->i_sb;
+ inode = new_inode(sb);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+
+ oi = exofs_i(inode);
+
+ init_waitqueue_head(&oi->i_wq);
+ set_obj_2bcreated(oi);
+
+ sbi = sb->s_fs_info;
+
+ sb->s_dirt = 1;
+ inode->i_uid = current->cred->fsuid;
+ if (dir->i_mode & S_ISGID) {
+ inode->i_gid = dir->i_gid;
+ if (S_ISDIR(mode))
+ mode |= S_ISGID;
+ } else {
+ inode->i_gid = current->cred->fsgid;
+ }
+ inode->i_mode = mode;
+
+ inode->i_ino = sbi->s_nextid++;
+ inode->i_blkbits = EXOFS_BLKSHIFT;
+ inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
+ oi->i_commit_size = inode->i_size = 0;
+ spin_lock(&sbi->s_next_gen_lock);
+ inode->i_generation = sbi->s_next_generation++;
+ spin_unlock(&sbi->s_next_gen_lock);
+ insert_inode_hash(inode);
+
+ mark_inode_dirty(inode);
+
+ obj.partition = sbi->s_pid;
+ obj.id = inode->i_ino + EXOFS_OBJ_OFF;
+ exofs_make_credential(oi->i_cred, &obj);
+
+ or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("exofs_new_inode: osd_start_request failed\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ osd_req_create_object(or, &obj);
+
+ /* increment the refcount so that the inode will still be around when we
+ * reach the callback
+ */
+ atomic_inc(&inode->i_count);
+
+ ret = exofs_async_op(or, create_done, inode, oi->i_cred);
+ if (ret) {
+ atomic_dec(&inode->i_count);
+ osd_end_request(or);
+ return ERR_PTR(-EIO);
+ }
+ atomic_inc(&sbi->s_curr_pending);
+
+ return inode;
+}
+
+/*
+ * struct to pass two arguments to update_inode's callback
+ */
+struct updatei_args {
+ struct exofs_sb_info *sbi;
+ struct exofs_fcb fcb;
+};
+
+/*
+ * Callback function from exofs_update_inode().
+ */
+static void updatei_done(struct osd_request *or, void *p)
+{
+ struct updatei_args *args = p;
+
+ osd_end_request(or);
+
+ atomic_dec(&args->sbi->s_curr_pending);
+
+ kfree(args);
+}
+
+/*
+ * Write the inode to the OSD. Just fill up the struct, and set the attribute
+ * synchronously or asynchronously depending on the do_sync flag.
+ */
+static int exofs_update_inode(struct inode *inode, int do_sync)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct super_block *sb = inode->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
+ struct osd_request *or;
+ struct osd_attr attr;
+ struct exofs_fcb *fcb;
+ struct updatei_args *args;
+ int ret;
+
+ args = kzalloc(sizeof(*args), GFP_KERNEL);
+ if (!args)
+ return -ENOMEM;
+
+ fcb = &args->fcb;
+
+ fcb->i_mode = cpu_to_le16(inode->i_mode);
+ fcb->i_uid = cpu_to_le32(inode->i_uid);
+ fcb->i_gid = cpu_to_le32(inode->i_gid);
+ fcb->i_links_count = cpu_to_le16(inode->i_nlink);
+ fcb->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
+ fcb->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
+ fcb->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
+ oi->i_commit_size = i_size_read(inode);
+ fcb->i_size = cpu_to_le64(oi->i_commit_size);
+ fcb->i_generation = cpu_to_le32(inode->i_generation);
+
+ if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
+ if (old_valid_dev(inode->i_rdev)) {
+ fcb->i_data[0] =
+ cpu_to_le32(old_encode_dev(inode->i_rdev));
+ fcb->i_data[1] = 0;
+ } else {
+ fcb->i_data[0] = 0;
+ fcb->i_data[1] =
+ cpu_to_le32(new_encode_dev(inode->i_rdev));
+ fcb->i_data[2] = 0;
+ }
+ } else
+ memcpy(fcb->i_data, oi->i_data, sizeof(fcb->i_data));
+
+ or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("exofs_update_inode: osd_start_request failed.\n");
+ ret = -ENOMEM;
+ goto free_args;
+ }
+
+ osd_req_set_attributes(or, &obj);
+
+ attr = g_attr_inode_data;
+ attr.val_ptr = fcb;
+ osd_req_add_set_attr_list(or, &attr, 1);
+
+ if (!obj_created(oi)) {
+ EXOFS_DBGMSG("!obj_created\n");
+ BUG_ON(!obj_2bcreated(oi));
+ wait_event(oi->i_wq, obj_created(oi));
+ EXOFS_DBGMSG("wait_event done\n");
+ }
+
+ if (do_sync) {
+ ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred);
+ osd_end_request(or);
+ goto free_args;
+ } else {
+ args->sbi = sbi;
+
+ ret = exofs_async_op(or, updatei_done, args, oi->i_cred);
+ if (ret) {
+ osd_end_request(or);
+ goto free_args;
+ }
+ atomic_inc(&sbi->s_curr_pending);
+ goto out; /* deallocation in updatei_done */
+ }
+
+free_args:
+ kfree(args);
+out:
+ EXOFS_DBGMSG("ret=>%d\n", ret);
+ return ret;
+}
+
+int exofs_write_inode(struct inode *inode, int wait)
+{
+ return exofs_update_inode(inode, wait);
+}
+
+/*
+ * Callback function from exofs_delete_inode() - don't have much cleaning up to
+ * do.
+ */
+static void delete_done(struct osd_request *or, void *p)
+{
+ struct exofs_sb_info *sbi;
+ osd_end_request(or);
+ sbi = p;
+ atomic_dec(&sbi->s_curr_pending);
+}
+
+/*
+ * Called when the refcount of an inode reaches zero. We remove the object
+ * from the OSD here. We make sure the object was created before we try and
+ * delete it.
+ */
+void exofs_delete_inode(struct inode *inode)
+{
+ struct exofs_i_info *oi = exofs_i(inode);
+ struct super_block *sb = inode->i_sb;
+ struct exofs_sb_info *sbi = sb->s_fs_info;
+ struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF};
+ struct osd_request *or;
+ int ret;
+
+ truncate_inode_pages(&inode->i_data, 0);
+
+ if (is_bad_inode(inode))
+ goto no_delete;
+
+ mark_inode_dirty(inode);
+ exofs_update_inode(inode, inode_needs_sync(inode));
+
+ inode->i_size = 0;
+ if (inode->i_blocks)
+ exofs_truncate(inode);
+
+ clear_inode(inode);
+
+ or = osd_start_request(sbi->s_dev, GFP_KERNEL);
+ if (unlikely(!or)) {
+ EXOFS_ERR("exofs_delete_inode: osd_start_request failed\n");
+ return;
+ }
+
+ osd_req_remove_object(or, &obj);
+
+ /* if we are deleting an obj that hasn't been created yet, wait */
+ if (!obj_created(oi)) {
+ BUG_ON(!obj_2bcreated(oi));
+ wait_event(oi->i_wq, obj_created(oi));
+ }
+
+ ret = exofs_async_op(or, delete_done, sbi, oi->i_cred);
+ if (ret) {
+ EXOFS_ERR(
+ "ERROR: @exofs_delete_inode exofs_async_op failed\n");
+ osd_end_request(or);
+ return;
+ }
+ atomic_inc(&sbi->s_curr_pending);
+
+ return;
+
+no_delete:
+ clear_inode(inode);
+}
--- /dev/null
+/*
+ * 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,
+};
--- /dev/null
+/*
+ * 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;
+}
--- /dev/null
+/*
+ * 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)
--- /dev/null
+/*
+ * 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,
+};
projects / linux-2.6-omap-h63xx.git / commitdiff