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/filelock.h>
10 #include <linux/posix_acl.h>
11 #include <linux/quotaops.h>
12 #include "jfs_incore.h"
13 #include "jfs_inode.h"
14 #include "jfs_dmap.h"
15 #include "jfs_txnmgr.h"
16 #include "jfs_xattr.h"
17 #include "jfs_acl.h"
18 #include "jfs_debug.h"
19
jfs_fsync(struct file * file,loff_t start,loff_t end,int datasync)20 int jfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
21 {
22 struct inode *inode = file->f_mapping->host;
23 int rc = 0;
24
25 rc = file_write_and_wait_range(file, start, end);
26 if (rc)
27 return rc;
28
29 inode_lock(inode);
30 if (!(inode_state_read_once(inode) & I_DIRTY_ALL) ||
31 (datasync && !(inode_state_read_once(inode) & I_DIRTY_DATASYNC))) {
32 /* Make sure committed changes hit the disk */
33 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, 1);
34 inode_unlock(inode);
35 return rc;
36 }
37
38 rc |= jfs_commit_inode(inode, 1);
39 inode_unlock(inode);
40
41 return rc ? -EIO : 0;
42 }
43
jfs_open(struct inode * inode,struct file * file)44 static int jfs_open(struct inode *inode, struct file *file)
45 {
46 int rc;
47
48 if (S_ISREG(inode->i_mode) && inode->i_size < 0)
49 return -EIO;
50
51 if ((rc = dquot_file_open(inode, file)))
52 return rc;
53
54 /*
55 * We attempt to allow only one "active" file open per aggregate
56 * group. Otherwise, appending to files in parallel can cause
57 * fragmentation within the files.
58 *
59 * If the file is empty, it was probably just created and going
60 * to be written to. If it has a size, we'll hold off until the
61 * file is actually grown.
62 */
63 if (S_ISREG(inode->i_mode) && file->f_mode & FMODE_WRITE &&
64 (inode->i_size == 0)) {
65 struct jfs_inode_info *ji = JFS_IP(inode);
66 spin_lock_irq(&ji->ag_lock);
67 if (ji->active_ag == -1) {
68 struct jfs_sb_info *jfs_sb = JFS_SBI(inode->i_sb);
69 ji->active_ag = BLKTOAG(addressPXD(&ji->ixpxd), jfs_sb);
70 atomic_inc(&jfs_sb->bmap->db_active[ji->active_ag]);
71 }
72 spin_unlock_irq(&ji->ag_lock);
73 }
74
75 return 0;
76 }
jfs_release(struct inode * inode,struct file * file)77 static int jfs_release(struct inode *inode, struct file *file)
78 {
79 struct jfs_inode_info *ji = JFS_IP(inode);
80
81 spin_lock_irq(&ji->ag_lock);
82 if (ji->active_ag != -1) {
83 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
84 atomic_dec(&bmap->db_active[ji->active_ag]);
85 ji->active_ag = -1;
86 }
87 spin_unlock_irq(&ji->ag_lock);
88
89 return 0;
90 }
91
jfs_setattr(struct mnt_idmap * idmap,struct dentry * dentry,struct iattr * iattr)92 int jfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
93 struct iattr *iattr)
94 {
95 struct inode *inode = d_inode(dentry);
96 int rc;
97
98 rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr);
99 if (rc)
100 return rc;
101
102 if (is_quota_modification(&nop_mnt_idmap, inode, iattr)) {
103 rc = dquot_initialize(inode);
104 if (rc)
105 return rc;
106 }
107 if ((iattr->ia_valid & ATTR_UID && !uid_eq(iattr->ia_uid, inode->i_uid)) ||
108 (iattr->ia_valid & ATTR_GID && !gid_eq(iattr->ia_gid, inode->i_gid))) {
109 rc = dquot_transfer(&nop_mnt_idmap, inode, iattr);
110 if (rc)
111 return rc;
112 }
113
114 if ((iattr->ia_valid & ATTR_SIZE) &&
115 iattr->ia_size != i_size_read(inode)) {
116 inode_dio_wait(inode);
117
118 rc = inode_newsize_ok(inode, iattr->ia_size);
119 if (rc)
120 return rc;
121
122 truncate_setsize(inode, iattr->ia_size);
123 jfs_truncate(inode);
124 }
125
126 setattr_copy(&nop_mnt_idmap, inode, iattr);
127 mark_inode_dirty(inode);
128
129 if (iattr->ia_valid & ATTR_MODE)
130 rc = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode);
131 return rc;
132 }
133
134 const struct inode_operations jfs_file_inode_operations = {
135 .listxattr = jfs_listxattr,
136 .setattr = jfs_setattr,
137 .fileattr_get = jfs_fileattr_get,
138 .fileattr_set = jfs_fileattr_set,
139 #ifdef CONFIG_JFS_POSIX_ACL
140 .get_inode_acl = jfs_get_acl,
141 .set_acl = jfs_set_acl,
142 #endif
143 };
144
145 const struct file_operations jfs_file_operations = {
146 .open = jfs_open,
147 .llseek = generic_file_llseek,
148 .read_iter = generic_file_read_iter,
149 .write_iter = generic_file_write_iter,
150 .mmap_prepare = generic_file_mmap_prepare,
151 .splice_read = filemap_splice_read,
152 .splice_write = iter_file_splice_write,
153 .fsync = jfs_fsync,
154 .release = jfs_release,
155 .unlocked_ioctl = jfs_ioctl,
156 .compat_ioctl = compat_ptr_ioctl,
157 .setlease = generic_setlease,
158 };
159