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-rw-r--r--fs/btrfs/super.c184
1 files changed, 65 insertions, 119 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index e76fcd80db6a..820d21ee4afd 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -18,124 +18,6 @@ static struct inode_operations btrfs_dir_inode_operations;
18static struct super_operations btrfs_super_ops; 18static struct super_operations btrfs_super_ops;
19static struct file_operations btrfs_dir_file_operations; 19static struct file_operations btrfs_dir_file_operations;
20 20
21#if 0
22/* some random number */
23
24static struct super_operations ramfs_ops;
25
26static struct backing_dev_info ramfs_backing_dev_info = {
27 .ra_pages = 0, /* No readahead */
28 .capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
29 BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
30 BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
31};
32
33struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev)
34{
35 struct inode * inode = new_inode(sb);
36
37 if (inode) {
38 inode->i_mode = mode;
39 inode->i_uid = current->fsuid;
40 inode->i_gid = current->fsgid;
41 inode->i_blocks = 0;
42 inode->i_mapping->a_ops = &ramfs_aops;
43 inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
44 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
45 switch (mode & S_IFMT) {
46 default:
47 init_special_inode(inode, mode, dev);
48 break;
49 case S_IFREG:
50 inode->i_op = &ramfs_file_inode_operations;
51 inode->i_fop = &ramfs_file_operations;
52 break;
53 case S_IFDIR:
54 inode->i_op = &ramfs_dir_inode_operations;
55 inode->i_fop = &simple_dir_operations;
56
57 /* directory inodes start off with i_nlink == 2 (for "." entry) */
58 inc_nlink(inode);
59 break;
60 case S_IFLNK:
61 inode->i_op = &page_symlink_inode_operations;
62 break;
63 }
64 }
65 return inode;
66}
67
68/*
69 * File creation. Allocate an inode, and we're done..
70 */
71/* SMP-safe */
72static int
73ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
74{
75 struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
76 int error = -ENOSPC;
77
78 if (inode) {
79 if (dir->i_mode & S_ISGID) {
80 inode->i_gid = dir->i_gid;
81 if (S_ISDIR(mode))
82 inode->i_mode |= S_ISGID;
83 }
84 d_instantiate(dentry, inode);
85 dget(dentry); /* Extra count - pin the dentry in core */
86 error = 0;
87 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
88 }
89 return error;
90}
91
92static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
93{
94 int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
95 if (!retval)
96 inc_nlink(dir);
97 return retval;
98}
99
100static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
101{
102 return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
103}
104
105static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
106{
107 struct inode *inode;
108 int error = -ENOSPC;
109
110 inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
111 if (inode) {
112 int l = strlen(symname)+1;
113 error = page_symlink(inode, symname, l);
114 if (!error) {
115 if (dir->i_mode & S_ISGID)
116 inode->i_gid = dir->i_gid;
117 d_instantiate(dentry, inode);
118 dget(dentry);
119 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
120 } else
121 iput(inode);
122 }
123 return error;
124}
125
126static struct inode_operations ramfs_dir_inode_operations = {
127 .create = ramfs_create,
128 .lookup = simple_lookup,
129 .link = simple_link,
130 .unlink = simple_unlink,
131 .symlink = ramfs_symlink,
132 .mkdir = ramfs_mkdir,
133 .rmdir = simple_rmdir,
134 .mknod = ramfs_mknod,
135 .rename = simple_rename,
136};
137#endif
138
139static void btrfs_read_locked_inode(struct inode *inode) 21static void btrfs_read_locked_inode(struct inode *inode)
140{ 22{
141 struct btrfs_path path; 23 struct btrfs_path path;
@@ -533,9 +415,11 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
533 inode->i_ino = objectid; 415 inode->i_ino = objectid;
534 inode->i_blocks = 0; 416 inode->i_blocks = 0;
535 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC; 417 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
418 /* FIXME do this on link */
419 if (mode & S_IFDIR)
420 inode->i_size = 3;
536 fill_inode_item(&inode_item, inode); 421 fill_inode_item(&inode_item, inode);
537 422
538
539 key.objectid = objectid; 423 key.objectid = objectid;
540 key.flags = 0; 424 key.flags = 0;
541 key.offset = 0; 425 key.offset = 0;
@@ -603,6 +487,67 @@ out_unlock:
603 return err; 487 return err;
604} 488}
605 489
490static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
491 struct inode *inode, struct inode *dir)
492{
493 struct btrfs_root *root = btrfs_sb(inode->i_sb);
494 int ret;
495 char buf[2];
496 buf[0] = '.';
497 buf[1] = '.';
498
499 ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
500 inode->i_ino, 1);
501 if (ret)
502 goto error;
503 ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
504 dir->i_ino, 1);
505error:
506 return ret;
507}
508
509static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
510{
511 struct inode *inode;
512 struct btrfs_trans_handle *trans;
513 struct btrfs_root *root = btrfs_sb(dir->i_sb);
514 int err = 0;
515 int drop_on_err = 0;
516
517 mutex_lock(&root->fs_info->fs_mutex);
518 trans = btrfs_start_transaction(root, 1);
519 if (IS_ERR(trans)) {
520 err = PTR_ERR(trans);
521 goto out_unlock;
522 }
523 inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
524 if (IS_ERR(inode)) {
525 err = PTR_ERR(inode);
526 goto out_fail;
527 }
528 drop_on_err = 1;
529 inode->i_op = &btrfs_dir_inode_operations;
530 inode->i_fop = &btrfs_dir_file_operations;
531
532 err = btrfs_make_empty_dir(trans, inode, dir);
533 if (err)
534 goto out_fail;
535 err = btrfs_add_link(trans, dentry, inode);
536 if (err)
537 goto out_fail;
538 d_instantiate(dentry, inode);
539 mark_inode_dirty(inode);
540 drop_on_err = 0;
541
542out_fail:
543 btrfs_end_transaction(trans, root);
544out_unlock:
545 mutex_unlock(&root->fs_info->fs_mutex);
546 if (drop_on_err)
547 iput(inode);
548 return err;
549}
550
606static int btrfs_sync_fs(struct super_block *sb, int wait) 551static int btrfs_sync_fs(struct super_block *sb, int wait)
607{ 552{
608 struct btrfs_trans_handle *trans; 553 struct btrfs_trans_handle *trans;
@@ -661,6 +606,7 @@ static struct inode_operations btrfs_dir_inode_operations = {
661 .lookup = btrfs_lookup, 606 .lookup = btrfs_lookup,
662 .create = btrfs_create, 607 .create = btrfs_create,
663 .unlink = btrfs_unlink, 608 .unlink = btrfs_unlink,
609 .mkdir = btrfs_mkdir,
664}; 610};
665 611
666static struct file_operations btrfs_dir_file_operations = { 612static struct file_operations btrfs_dir_file_operations = {
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-29 14:32:25 -0500