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e8062719 BH |
1 | /* |
2 | * Copyright (C) 2005, 2006 | |
3 | * Avishay Traeger (avishay@gmail.com) (avishay@il.ibm.com) | |
4 | * Copyright (C) 2005, 2006 | |
5 | * International Business Machines | |
6 | * Copyright (C) 2008, 2009 | |
7 | * Boaz Harrosh <bharrosh@panasas.com> | |
8 | * | |
9 | * Copyrights for code taken from ext2: | |
10 | * Copyright (C) 1992, 1993, 1994, 1995 | |
11 | * Remy Card (card@masi.ibp.fr) | |
12 | * Laboratoire MASI - Institut Blaise Pascal | |
13 | * Universite Pierre et Marie Curie (Paris VI) | |
14 | * from | |
15 | * linux/fs/minix/inode.c | |
16 | * Copyright (C) 1991, 1992 Linus Torvalds | |
17 | * | |
18 | * This file is part of exofs. | |
19 | * | |
20 | * exofs is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation. Since it is based on ext2, and the only | |
23 | * valid version of GPL for the Linux kernel is version 2, the only valid | |
24 | * version of GPL for exofs is version 2. | |
25 | * | |
26 | * exofs is distributed in the hope that it will be useful, | |
27 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29 | * GNU General Public License for more details. | |
30 | * | |
31 | * You should have received a copy of the GNU General Public License | |
32 | * along with exofs; if not, write to the Free Software | |
33 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
34 | */ | |
35 | ||
36 | #include <linux/writeback.h> | |
37 | #include <linux/buffer_head.h> | |
38 | ||
39 | #include "exofs.h" | |
40 | ||
41 | #ifdef CONFIG_EXOFS_DEBUG | |
42 | # define EXOFS_DEBUG_OBJ_ISIZE 1 | |
43 | #endif | |
44 | ||
45 | /****************************************************************************** | |
46 | * INODE OPERATIONS | |
47 | *****************************************************************************/ | |
48 | ||
49 | /* | |
50 | * Test whether an inode is a fast symlink. | |
51 | */ | |
52 | static inline int exofs_inode_is_fast_symlink(struct inode *inode) | |
53 | { | |
54 | struct exofs_i_info *oi = exofs_i(inode); | |
55 | ||
56 | return S_ISLNK(inode->i_mode) && (oi->i_data[0] != 0); | |
57 | } | |
58 | ||
59 | /* | |
60 | * get_block_t - Fill in a buffer_head | |
61 | * An OSD takes care of block allocation so we just fake an allocation by | |
62 | * putting in the inode's sector_t in the buffer_head. | |
63 | * TODO: What about the case of create==0 and @iblock does not exist in the | |
64 | * object? | |
65 | */ | |
66 | static int exofs_get_block(struct inode *inode, sector_t iblock, | |
67 | struct buffer_head *bh_result, int create) | |
68 | { | |
69 | map_bh(bh_result, inode->i_sb, iblock); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | const struct osd_attr g_attr_logical_length = ATTR_DEF( | |
74 | OSD_APAGE_OBJECT_INFORMATION, OSD_ATTR_OI_LOGICAL_LENGTH, 8); | |
75 | ||
76 | /* | |
77 | * Truncate a file to the specified size - all we have to do is set the size | |
78 | * attribute. We make sure the object exists first. | |
79 | */ | |
80 | void exofs_truncate(struct inode *inode) | |
81 | { | |
82 | struct exofs_sb_info *sbi = inode->i_sb->s_fs_info; | |
83 | struct exofs_i_info *oi = exofs_i(inode); | |
84 | struct osd_obj_id obj = {sbi->s_pid, inode->i_ino + EXOFS_OBJ_OFF}; | |
85 | struct osd_request *or; | |
86 | struct osd_attr attr; | |
87 | loff_t isize = i_size_read(inode); | |
88 | __be64 newsize; | |
89 | int ret; | |
90 | ||
91 | if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) | |
92 | || S_ISLNK(inode->i_mode))) | |
93 | return; | |
94 | if (exofs_inode_is_fast_symlink(inode)) | |
95 | return; | |
96 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
97 | return; | |
98 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; | |
99 | ||
100 | nobh_truncate_page(inode->i_mapping, isize, exofs_get_block); | |
101 | ||
102 | or = osd_start_request(sbi->s_dev, GFP_KERNEL); | |
103 | if (unlikely(!or)) { | |
104 | EXOFS_ERR("ERROR: exofs_truncate: osd_start_request failed\n"); | |
105 | goto fail; | |
106 | } | |
107 | ||
108 | osd_req_set_attributes(or, &obj); | |
109 | ||
110 | newsize = cpu_to_be64((u64)isize); | |
111 | attr = g_attr_logical_length; | |
112 | attr.val_ptr = &newsize; | |
113 | osd_req_add_set_attr_list(or, &attr, 1); | |
114 | ||
115 | /* if we are about to truncate an object, and it hasn't been | |
116 | * created yet, wait | |
117 | */ | |
118 | if (unlikely(wait_obj_created(oi))) | |
119 | goto fail; | |
120 | ||
121 | ret = exofs_sync_op(or, sbi->s_timeout, oi->i_cred); | |
122 | osd_end_request(or); | |
123 | if (ret) | |
124 | goto fail; | |
125 | ||
126 | out: | |
127 | mark_inode_dirty(inode); | |
128 | return; | |
129 | fail: | |
130 | make_bad_inode(inode); | |
131 | goto out; | |
132 | } | |
133 | ||
134 | /* | |
135 | * Set inode attributes - just call generic functions. | |
136 | */ | |
137 | int exofs_setattr(struct dentry *dentry, struct iattr *iattr) | |
138 | { | |
139 | struct inode *inode = dentry->d_inode; | |
140 | int error; | |
141 | ||
142 | error = inode_change_ok(inode, iattr); | |
143 | if (error) | |
144 | return error; | |
145 | ||
146 | error = inode_setattr(inode, iattr); | |
147 | return error; | |
148 | } |