diff options
| author | Boaz Harrosh <bharrosh@panasas.com> | 2008-10-27 18:37:02 +0200 |
|---|---|---|
| committer | Boaz Harrosh <bharrosh@panasas.com> | 2009-03-31 19:44:24 +0300 |
| commit | e806271916ed6068a0e3e4e9298dff0688b88e0d (patch) | |
| tree | 53669f4a55fecd82d289c035712d416e5b8dce35 /fs/exofs/inode.c | |
| parent | b14f8ab2844987f013253dd04b708bde7fc1b52d (diff) | |
exofs: file and file_inode operations
implementation of the file_operations and inode_operations for
regular data files.
Most file_operations are generic vfs implementations except:
- exofs_truncate will truncate the OSD object as well
- Generic file_fsync is not good for none_bd devices so open code it
- The default for .flush in Linux is todo nothing so call exofs_fsync
on the file.
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Diffstat (limited to 'fs/exofs/inode.c')
| -rw-r--r-- | fs/exofs/inode.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c new file mode 100644 index 000000000000..b0bda1e91225 --- /dev/null +++ b/fs/exofs/inode.c @@ -0,0 +1,148 @@ +/* + * 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 "exofs.h" + +#ifdef CONFIG_EXOFS_DEBUG +# define EXOFS_DEBUG_OBJ_ISIZE 1 +#endif + +/****************************************************************************** + * 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; +} |