Commit | Line | Data |
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9c25d2e3 DM |
1 | /* |
2 | * ioe_e4defrag: ioengine for git://git.kernel.dk/fio.git | |
3 | * | |
4 | * IO engine that does regular EXT4_IOC_MOVE_EXT ioctls to simulate | |
5 | * defragment activity | |
6 | * | |
7 | */ | |
8 | ||
9 | #include <sys/types.h> | |
10 | #include <sys/stat.h> | |
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <unistd.h> | |
14 | #include <sys/uio.h> | |
15 | #include <errno.h> | |
16 | #include <assert.h> | |
17 | #include <fcntl.h> | |
18 | ||
19 | #include "../fio.h" | |
20 | ||
21 | #ifndef EXT4_IOC_MOVE_EXT | |
22 | #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent) | |
23 | struct move_extent { | |
24 | __u32 reserved; /* should be zero */ | |
25 | __u32 donor_fd; /* donor file descriptor */ | |
26 | __u64 orig_start; /* logical start offset in block for orig */ | |
27 | __u64 donor_start; /* logical start offset in block for donor */ | |
28 | __u64 len; /* block length to be moved */ | |
29 | __u64 moved_len; /* moved block length */ | |
30 | }; | |
31 | #endif | |
32 | ||
33 | struct e4defrag_data { | |
34 | int donor_fd; | |
35 | int bsz; | |
36 | }; | |
37 | ||
38 | struct e4defrag_options { | |
39 | struct thread_data *td; | |
40 | unsigned int inplace; | |
41 | char * donor_name; | |
42 | }; | |
43 | ||
44 | static struct fio_option options[] = { | |
45 | { | |
46 | .name = "donorname", | |
47 | .type = FIO_OPT_STR_STORE, | |
48 | .off1 = offsetof(struct e4defrag_options, donor_name), | |
49 | .help = "File used as a block donor", | |
e90a0adf JA |
50 | .category = FIO_OPT_C_ENGINE, |
51 | .group = FIO_OPT_G_E4DEFRAG, | |
9c25d2e3 DM |
52 | }, |
53 | { | |
54 | .name = "inplace", | |
55 | .type = FIO_OPT_INT, | |
56 | .off1 = offsetof(struct e4defrag_options, inplace), | |
57 | .minval = 0, | |
58 | .maxval = 1, | |
59 | .help = "Alloc and free space inside defrag event", | |
e90a0adf JA |
60 | .category = FIO_OPT_C_ENGINE, |
61 | .group = FIO_OPT_G_E4DEFRAG, | |
9c25d2e3 DM |
62 | }, |
63 | { | |
64 | .name = NULL, | |
65 | }, | |
66 | }; | |
67 | ||
68 | static int fio_e4defrag_init(struct thread_data *td) | |
69 | { | |
70 | int r, len = 0; | |
71 | struct e4defrag_options *o = td->eo; | |
72 | struct e4defrag_data *ed; | |
73 | struct stat stub; | |
74 | char donor_name[PATH_MAX]; | |
75 | ||
76 | if (!strlen(o->donor_name)) { | |
77 | log_err("'donorname' options required\n"); | |
78 | return 1; | |
79 | } | |
80 | ||
81 | ed = malloc(sizeof(*ed)); | |
82 | if (!ed) { | |
43e0d132 | 83 | td_verror(td, ENOMEM, "io_queue_init"); |
9c25d2e3 DM |
84 | return 1; |
85 | } | |
86 | memset(ed, 0 ,sizeof(*ed)); | |
87 | ||
88 | if (td->o.directory) | |
89 | len = sprintf(donor_name, "%s/", td->o.directory); | |
90 | sprintf(donor_name + len, "%s", o->donor_name); | |
91 | ||
92 | ed->donor_fd = open(donor_name, O_CREAT|O_WRONLY, 0644); | |
93 | if (ed->donor_fd < 0) { | |
43e0d132 | 94 | td_verror(td, errno, "io_queue_init"); |
4e0a8fa2 | 95 | log_err("Can't open donor file %s err:%d", donor_name, ed->donor_fd); |
9c25d2e3 DM |
96 | free(ed); |
97 | return 1; | |
98 | } | |
99 | ||
100 | if (!o->inplace) { | |
101 | long long len = td->o.file_size_high - td->o.start_offset; | |
102 | r = fallocate(ed->donor_fd, 0, td->o.start_offset, len); | |
103 | if (r) | |
104 | goto err; | |
105 | } | |
106 | r = fstat(ed->donor_fd, &stub); | |
107 | if (r) | |
108 | goto err; | |
109 | ||
110 | ed->bsz = stub.st_blksize; | |
111 | td->io_ops->data = ed; | |
112 | return 0; | |
113 | err: | |
114 | td_verror(td, errno, "io_queue_init"); | |
115 | close(ed->donor_fd); | |
116 | free(ed); | |
117 | return 1; | |
118 | } | |
119 | ||
120 | static void fio_e4defrag_cleanup(struct thread_data *td) | |
121 | { | |
122 | struct e4defrag_data *ed = td->io_ops->data; | |
123 | if (ed) { | |
124 | if (ed->donor_fd >= 0) | |
125 | close(ed->donor_fd); | |
126 | free(ed); | |
127 | } | |
128 | } | |
129 | ||
130 | ||
131 | static int fio_e4defrag_queue(struct thread_data *td, struct io_u *io_u) | |
132 | { | |
133 | ||
134 | int ret; | |
135 | unsigned long long len; | |
136 | struct move_extent me; | |
137 | struct fio_file *f = io_u->file; | |
138 | struct e4defrag_data *ed = td->io_ops->data; | |
139 | struct e4defrag_options *o = td->eo; | |
140 | ||
141 | fio_ro_check(td, io_u); | |
142 | ||
143 | /* Theoretically defragmentation should not change data, but it | |
144 | * changes data layout. So this function handle only DDIR_WRITE | |
145 | * in order to satisfy strict read only access pattern | |
146 | */ | |
147 | if (io_u->ddir != DDIR_WRITE) { | |
e12d2800 | 148 | io_u->error = EINVAL; |
9c25d2e3 DM |
149 | return FIO_Q_COMPLETED; |
150 | } | |
151 | ||
152 | if (o->inplace) { | |
153 | ret = fallocate(ed->donor_fd, 0, io_u->offset, io_u->xfer_buflen); | |
e12d2800 | 154 | if (ret) |
9c25d2e3 | 155 | goto out; |
9c25d2e3 DM |
156 | } |
157 | ||
158 | memset(&me, 0, sizeof(me)); | |
159 | me.donor_fd = ed->donor_fd; | |
160 | me.orig_start = io_u->offset / ed->bsz; | |
161 | me.donor_start = me.orig_start; | |
162 | len = (io_u->offset + io_u->xfer_buflen + ed->bsz -1); | |
163 | me.len = len / ed->bsz - me.orig_start; | |
164 | ||
165 | ret = ioctl(f->fd, EXT4_IOC_MOVE_EXT, &me); | |
166 | len = me.moved_len * ed->bsz; | |
167 | ||
9c25d2e3 DM |
168 | if (len > io_u->xfer_buflen) |
169 | len = io_u->xfer_buflen; | |
170 | ||
171 | if (len != io_u->xfer_buflen) { | |
172 | io_u->resid = io_u->xfer_buflen - len; | |
173 | io_u->error = 0; | |
174 | } | |
175 | if (ret) | |
176 | io_u->error = errno; | |
e12d2800 DM |
177 | |
178 | if (o->inplace) | |
9c25d2e3 | 179 | ret = ftruncate(ed->donor_fd, 0); |
9c25d2e3 | 180 | out: |
e12d2800 DM |
181 | if (ret && !io_u->error) |
182 | io_u->error = errno; | |
9c25d2e3 DM |
183 | |
184 | return FIO_Q_COMPLETED; | |
185 | } | |
186 | ||
187 | static struct ioengine_ops ioengine = { | |
188 | .name = "e4defrag", | |
189 | .version = FIO_IOOPS_VERSION, | |
190 | .init = fio_e4defrag_init, | |
191 | .queue = fio_e4defrag_queue, | |
192 | .open_file = generic_open_file, | |
193 | .close_file = generic_close_file, | |
194 | .get_file_size = generic_get_file_size, | |
195 | .flags = FIO_SYNCIO, | |
196 | .cleanup = fio_e4defrag_cleanup, | |
197 | .options = options, | |
198 | .option_struct_size = sizeof(struct e4defrag_options), | |
199 | ||
200 | }; | |
201 | ||
202 | static void fio_init fio_syncio_register(void) | |
203 | { | |
204 | register_ioengine(&ioengine); | |
205 | } | |
206 | ||
207 | static void fio_exit fio_syncio_unregister(void) | |
208 | { | |
209 | unregister_ioengine(&ioengine); | |
210 | } |