file.c

  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *   Copyright (C) International Business Machines Corp., 2000-2002
  4 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
  5 */
  6
  7#include <linux/mm.h>
  8#include <linux/fs.h>
  9#include <linux/posix_acl.h>
 10#include <linux/quotaops.h>
 11#include "jfs_incore.h"
 12#include "jfs_inode.h"
 13#include "jfs_dmap.h"
 14#include "jfs_txnmgr.h"
 15#include "jfs_xattr.h"
 16#include "jfs_acl.h"
 17#include "jfs_debug.h"
 18
 19int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
 20{
 21	struct inode *inode = file->f_mapping->host;
 22	int rc = 0;
 23
 24	rc = file_write_and_wait_range(file, start, end);
 25	if (rc)
 26		return rc;
 27
 28	inode_lock(inode);
 29	if (!(inode_state_read_once(inode) & I_DIRTY_ALL) ||
 30	    (datasync && !(inode_state_read_once(inode) & I_DIRTY_DATASYNC))) {
 31		/* Make sure committed changes hit the disk */
 32		jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
 33		inode_unlock(inode);
 34		return rc;
 35	}
 36
 37	rc |= jfs_commit_inode(inode, 1);
 38	inode_unlock(inode);
 39
 40	return rc ? -EIO : 0;
 41}
 42
 43static int jfs_open(struct inode *inode, struct file *file)
 44{
 45	int rc;
 46
 47	if (S_ISREG(inode->i_mode) && inode->i_size < 0)
 48		return -EIO;
 49
 50	if ((rc = dquot_file_open(inode, file)))
 51		return rc;
 52
 53	/*
 54	 * We attempt to allow only one "active" file open per aggregate
 55	 * group.  Otherwise, appending to files in parallel can cause
 56	 * fragmentation within the files.
 57	 *
 58	 * If the file is empty, it was probably just created and going
 59	 * to be written to.  If it has a size, we'll hold off until the
 60	 * file is actually grown.
 61	 */
 62	if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
 63	    (inode->i_size == 0)) {
 64		struct jfs_inode_info *ji = JFS_IP(inode);
 65		spin_lock_irq(&ji->ag_lock);
 66		if (ji->active_ag == -1) {
 67			struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
 68			ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
 69			atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
 70		}
 71		spin_unlock_irq(&ji->ag_lock);
 72	}
 73
 74	return 0;
 75}
 76static int jfs_release(struct inode *inode, struct file *file)
 77{
 78	struct jfs_inode_info *ji = JFS_IP(inode);
 79
 80	spin_lock_irq(&ji->ag_lock);
 81	if (ji->active_ag != -1) {
 82		struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
 83		atomic_dec(&bmap->db_active[ji->active_ag]);
 84		ji->active_ag = -1;
 85	}
 86	spin_unlock_irq(&ji->ag_lock);
 87
 88	return 0;
 89}
 90
 91int jfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
 92		struct iattr *iattr)
 93{
 94	struct inode *inode = d_inode(dentry);
 95	int rc;
 96
 97	rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
 98	if (rc)
 99		return rc;
100
101	if (is_quota_modification(&nop_mnt_idmap, inode, iattr)) {
102		rc = dquot_initialize(inode);
103		if (rc)
104			return rc;
105	}
106	if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
107	    (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
108		rc = dquot_transfer(&nop_mnt_idmap, inode, iattr);
109		if (rc)
110			return rc;
111	}
112
113	if ((iattr->ia_valid & ATTR_SIZE) &&
114	    iattr->ia_size != i_size_read(inode)) {
115		inode_dio_wait(inode);
116
117		rc = inode_newsize_ok(inode, iattr->ia_size);
118		if (rc)
119			return rc;
120
121		truncate_setsize(inode, iattr->ia_size);
122		jfs_truncate(inode);
123	}
124
125	setattr_copy(&nop_mnt_idmap, inode, iattr);
126	mark_inode_dirty(inode);
127
128	if (iattr->ia_valid & ATTR_MODE)
129		rc = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode);
130	return rc;
131}
132
133const struct inode_operations jfs_file_inode_operations = {
134	.listxattr	= jfs_listxattr,
135	.setattr	= jfs_setattr,
136	.fileattr_get	= jfs_fileattr_get,
137	.fileattr_set	= jfs_fileattr_set,
138#ifdef CONFIG_JFS_POSIX_ACL
139	.get_inode_acl	= jfs_get_acl,
140	.set_acl	= jfs_set_acl,
141#endif
142};
143
144const struct file_operations jfs_file_operations = {
145	.open		= jfs_open,
146	.llseek		= generic_file_llseek,
147	.read_iter	= generic_file_read_iter,
148	.write_iter	= generic_file_write_iter,
149	.mmap_prepare	= generic_file_mmap_prepare,
150	.splice_read	= filemap_splice_read,
151	.splice_write	= iter_file_splice_write,
152	.fsync		= jfs_fsync,
153	.release	= jfs_release,
154	.unlocked_ioctl = jfs_ioctl,
155	.compat_ioctl	= compat_ptr_ioctl,
156};