forked from luck/tmp_suning_uos_patched
18f4c64477
This avoids an indirect call in the VFS for each path component lookup. Well, at least as long as you own the directory in question, and the ACL check is unnecessary. Reviewed-by: James Morris <jmorris@namei.org> Acked-by: Serge Hallyn <serue@us.ibm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
120 lines
3.3 KiB
C
120 lines
3.3 KiB
C
/*
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* Copyright (C) International Business Machines Corp., 2000-2002
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* Portions Copyright (C) Christoph Hellwig, 2001-2002
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include "jfs_incore.h"
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#include "jfs_inode.h"
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#include "jfs_dmap.h"
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#include "jfs_txnmgr.h"
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#include "jfs_xattr.h"
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#include "jfs_acl.h"
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#include "jfs_debug.h"
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int jfs_fsync(struct file *file, struct dentry *dentry, int datasync)
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{
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struct inode *inode = dentry->d_inode;
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int rc = 0;
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if (!(inode->i_state & I_DIRTY) ||
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(datasync && !(inode->i_state & I_DIRTY_DATASYNC))) {
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/* Make sure committed changes hit the disk */
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jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
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return rc;
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}
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rc |= jfs_commit_inode(inode, 1);
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return rc ? -EIO : 0;
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}
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static int jfs_open(struct inode *inode, struct file *file)
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{
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int rc;
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if ((rc = generic_file_open(inode, file)))
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return rc;
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/*
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* We attempt to allow only one "active" file open per aggregate
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* group. Otherwise, appending to files in parallel can cause
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* fragmentation within the files.
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*
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* If the file is empty, it was probably just created and going
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* to be written to. If it has a size, we'll hold off until the
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* file is actually grown.
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*/
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if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
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(inode->i_size == 0)) {
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struct jfs_inode_info *ji = JFS_IP(inode);
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spin_lock_irq(&ji->ag_lock);
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if (ji->active_ag == -1) {
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ji->active_ag = ji->agno;
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atomic_inc(
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&JFS_SBI(inode->i_sb)->bmap->db_active[ji->agno]);
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}
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spin_unlock_irq(&ji->ag_lock);
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}
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return 0;
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}
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static int jfs_release(struct inode *inode, struct file *file)
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{
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struct jfs_inode_info *ji = JFS_IP(inode);
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spin_lock_irq(&ji->ag_lock);
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if (ji->active_ag != -1) {
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struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
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atomic_dec(&bmap->db_active[ji->active_ag]);
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ji->active_ag = -1;
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}
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spin_unlock_irq(&ji->ag_lock);
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return 0;
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}
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const struct inode_operations jfs_file_inode_operations = {
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.truncate = jfs_truncate,
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.setxattr = jfs_setxattr,
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.getxattr = jfs_getxattr,
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.listxattr = jfs_listxattr,
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.removexattr = jfs_removexattr,
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#ifdef CONFIG_JFS_POSIX_ACL
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.setattr = jfs_setattr,
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.check_acl = jfs_check_acl,
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#endif
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};
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const struct file_operations jfs_file_operations = {
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.open = jfs_open,
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.llseek = generic_file_llseek,
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.write = do_sync_write,
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.read = do_sync_read,
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.aio_read = generic_file_aio_read,
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.aio_write = generic_file_aio_write,
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.mmap = generic_file_mmap,
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.splice_read = generic_file_splice_read,
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.splice_write = generic_file_splice_write,
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.fsync = jfs_fsync,
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.release = jfs_release,
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.unlocked_ioctl = jfs_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = jfs_compat_ioctl,
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#endif
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};
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