kernel-ark/fs/jfs/file.c

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/*
* Copyright (C) International Business Machines Corp., 2000-2002
* Portions Copyright (C) Christoph Hellwig, 2001-2002
*
* This program 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; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include "jfs_incore.h"
#include "jfs_inode.h"
#include "jfs_dmap.h"
#include "jfs_txnmgr.h"
#include "jfs_xattr.h"
#include "jfs_acl.h"
#include "jfs_debug.h"
int jfs_fsync(struct file *file, struct dentry *dentry, int datasync)
{
struct inode *inode = dentry->d_inode;
int rc = 0;
if (!(inode->i_state & I_DIRTY) ||
(datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
/* Make sure committed changes hit the disk */
jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
return rc;
}
rc |= jfs_commit_inode(inode, 1);
return rc ? -EIO : 0;
}
static int jfs_open(struct inode *inode, struct file *file)
{
int rc;
if ((rc = generic_file_open(inode, file)))
return rc;
/*
* We attempt to allow only one "active" file open per aggregate
* group. Otherwise, appending to files in parallel can cause
* fragmentation within the files.
*
* If the file is empty, it was probably just created and going
* to be written to. If it has a size, we'll hold off until the
* file is actually grown.
*/
if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
(inode->i_size == 0)) {
struct jfs_inode_info *ji = JFS_IP(inode);
spin_lock_irq(&ji->ag_lock);
if (ji->active_ag == -1) {
ji->active_ag = ji->agno;
atomic_inc(
&JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
}
spin_unlock_irq(&ji->ag_lock);
}
return 0;
}
static int jfs_release(struct inode *inode, struct file *file)
{
struct jfs_inode_info *ji = JFS_IP(inode);
spin_lock_irq(&ji->ag_lock);
if (ji->active_ag != -1) {
struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
atomic_dec(&bmap->db_active[ji->active_ag]);
ji->active_ag = -1;
}
spin_unlock_irq(&ji->ag_lock);
return 0;
}
struct inode_operations jfs_file_inode_operations = {
.truncate = jfs_truncate,
.setxattr = jfs_setxattr,
.getxattr = jfs_getxattr,
.listxattr = jfs_listxattr,
.removexattr = jfs_removexattr,
#ifdef CONFIG_JFS_POSIX_ACL
.setattr = jfs_setattr,
.permission = jfs_permission,
#endif
};
const struct file_operations jfs_file_operations = {
.open = jfs_open,
.llseek = generic_file_llseek,
.write = do_sync_write,
.read = do_sync_read,
.aio_read = generic_file_aio_read,
.aio_write = generic_file_aio_write,
.mmap = generic_file_mmap,
.sendfile = generic_file_sendfile,
.fsync = jfs_fsync,
.release = jfs_release,
JFS: ext2 inode attributes for jfs ext2 inode attributes with relevance for jfs: 'a' EXT2_APPEND_FL -> append only 'i' EXT2_IMMUTABLE_FL -> immutable file 's' EXT2_SECRM_FL -> zero file 'u' EXT2_UNRM_FL -> allow for unrm 'A' EXT2_NOATIME_FL -> no access time 'D' EXT2_DIRSYNC_FL -> dirsync 'S' EXT2_SYNC_FL -> sync overview of jfs flags (partially for OS/2) value (OS/2) Linux ext2 attrs ------------------------------------------------ 0x00010000 IFJOURNAL - 0x00020000 ISPARSE used 0x00040000 INLINEEA used 0x00080000 - - JFS_NOATIME_FL 0x00100000 - - JFS_DIRSYNC_FL 0x00200000 - - JFS_SYNC_FL 0x00400000 - - JFS_SECRM_FL 0x00800000 ISWAPFILE - JFS_UNRM_FL 0x01000000 - - JFS_APPEND_FL 0x02000000 IREADONLY - JFS_IMMUTABLE_FL 0x04000000 IHIDDEN - - 0x08000000 ISYSTEM - - 0x10000000 - - 0x20000000 IDIRECTORY used 0x40000000 IARCHIVE - 0x80000000 INEWNAME - the implementation is straight forward, except for the fact that the attributes have to be mapped to match with the ext2 ones to avoid a separate tool for manipulating them (this could be avoided when using a separate flag field in the on-disk representation, but the overhead is minimal) a special jfs_ioctl is added to allow for the new JFS_IOC_GETFLAGS and JFS_IOC_SETFLAGS calls. a helper function jfs_set_inode_flags() to transfer the flags from the on-disk version to the inode minor changes to allow flag inheritance on inode creation, as well as a cleanup of the on-disk flags (including the new ones) beforementioned helper to map between ext2 and jfs versions of the new flags ... the JFS_SECRM_FL and JFS_UNRM_FL are not done yet and I'm not 100% sure they are worth the effort, the rest seems to work out of the box ... Signed-off-by: Herbert Poetzl <herbert@13thfloor.at> Signed-off-by: Dave Kleikamp <shaggy@austin.ibm.com>
2006-02-09 15:09:16 +00:00
.ioctl = jfs_ioctl,
};