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-rw-r--r--fs/seq_file.c128
1 files changed, 68 insertions, 60 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 16c211558c22..5267098532bf 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -54,6 +54,64 @@ int seq_open(struct file *file, const struct seq_operations *op)
54} 54}
55EXPORT_SYMBOL(seq_open); 55EXPORT_SYMBOL(seq_open);
56 56
57static int traverse(struct seq_file *m, loff_t offset)
58{
59 loff_t pos = 0, index;
60 int error = 0;
61 void *p;
62
63 m->version = 0;
64 index = 0;
65 m->count = m->from = 0;
66 if (!offset) {
67 m->index = index;
68 return 0;
69 }
70 if (!m->buf) {
71 m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);
72 if (!m->buf)
73 return -ENOMEM;
74 }
75 p = m->op->start(m, &index);
76 while (p) {
77 error = PTR_ERR(p);
78 if (IS_ERR(p))
79 break;
80 error = m->op->show(m, p);
81 if (error < 0)
82 break;
83 if (unlikely(error)) {
84 error = 0;
85 m->count = 0;
86 }
87 if (m->count == m->size)
88 goto Eoverflow;
89 if (pos + m->count > offset) {
90 m->from = offset - pos;
91 m->count -= m->from;
92 m->index = index;
93 break;
94 }
95 pos += m->count;
96 m->count = 0;
97 if (pos == offset) {
98 index++;
99 m->index = index;
100 break;
101 }
102 p = m->op->next(m, p, &index);
103 }
104 m->op->stop(m, p);
105 m->index = index;
106 return error;
107
108Eoverflow:
109 m->op->stop(m, p);
110 kfree(m->buf);
111 m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
112 return !m->buf ? -ENOMEM : -EAGAIN;
113}
114
57/** 115/**
58 * seq_read - ->read() method for sequential files. 116 * seq_read - ->read() method for sequential files.
59 * @file: the file to read from 117 * @file: the file to read from
@@ -186,63 +244,6 @@ Efault:
186} 244}
187EXPORT_SYMBOL(seq_read); 245EXPORT_SYMBOL(seq_read);
188 246
189static int traverse(struct seq_file *m, loff_t offset)
190{
191 loff_t pos = 0, index;
192 int error = 0;
193 void *p;
194
195 m->version = 0;
196 index = 0;
197 m->count = m->from = 0;
198 if (!offset) {
199 m->index = index;
200 return 0;
201 }
202 if (!m->buf) {
203 m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);
204 if (!m->buf)
205 return -ENOMEM;
206 }
207 p = m->op->start(m, &index);
208 while (p) {
209 error = PTR_ERR(p);
210 if (IS_ERR(p))
211 break;
212 error = m->op->show(m, p);
213 if (error < 0)
214 break;
215 if (unlikely(error)) {
216 error = 0;
217 m->count = 0;
218 }
219 if (m->count == m->size)
220 goto Eoverflow;
221 if (pos + m->count > offset) {
222 m->from = offset - pos;
223 m->count -= m->from;
224 m->index = index;
225 break;
226 }
227 pos += m->count;
228 m->count = 0;
229 if (pos == offset) {
230 index++;
231 m->index = index;
232 break;
233 }
234 p = m->op->next(m, p, &index);
235 }
236 m->op->stop(m, p);
237 return error;
238
239Eoverflow:
240 m->op->stop(m, p);
241 kfree(m->buf);
242 m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
243 return !m->buf ? -ENOMEM : -EAGAIN;
244}
245
246/** 247/**
247 * seq_lseek - ->llseek() method for sequential files. 248 * seq_lseek - ->llseek() method for sequential files.
248 * @file: the file in question 249 * @file: the file in question
@@ -389,8 +390,14 @@ char *mangle_path(char *s, char *p, char *esc)
389} 390}
390EXPORT_SYMBOL(mangle_path); 391EXPORT_SYMBOL(mangle_path);
391 392
392/* 393/**
393 * return the absolute path of 'dentry' residing in mount 'mnt'. 394 * seq_path - seq_file interface to print a pathname
395 * @m: the seq_file handle
396 * @path: the struct path to print
397 * @esc: set of characters to escape in the output
398 *
399 * return the absolute path of 'path', as represented by the
400 * dentry / mnt pair in the path parameter.
394 */ 401 */
395int seq_path(struct seq_file *m, struct path *path, char *esc) 402int seq_path(struct seq_file *m, struct path *path, char *esc)
396{ 403{
@@ -462,7 +469,8 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, char *esc)
462 return -1; 469 return -1;
463} 470}
464 471
465int seq_bitmap(struct seq_file *m, unsigned long *bits, unsigned int nr_bits) 472int seq_bitmap(struct seq_file *m, const unsigned long *bits,
473 unsigned int nr_bits)
466{ 474{
467 if (m->count < m->size) { 475 if (m->count < m->size) {
468 int len = bitmap_scnprintf(m->buf + m->count, 476 int len = bitmap_scnprintf(m->buf + m->count,