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authorLinus Torvalds <torvalds@linux-foundation.org>2008-04-22 18:27:56 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-22 18:28:34 -0700
commit94bc891b00e40cbec375feb4568780af183fd7f4 (patch)
treefd48d354c61d2e736aa593c324a6d794afd8a4e7 /fs/seq_file.c
parent934b7024f0ed29003c95cef447d92737ab86dc4f (diff)
parent1ec7f1ddbe5ba49f7b10c3b129d6d5c90c43526c (diff)
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6: [PATCH] get rid of __exit_files(), __exit_fs() and __put_fs_struct() [PATCH] proc_readfd_common() race fix [PATCH] double-free of inode on alloc_file() failure exit in create_write_pipe() [PATCH] teach seq_file to discard entries [PATCH] umount_tree() will unhash everything itself [PATCH] get rid of more nameidata passing in namespace.c [PATCH] switch a bunch of LSM hooks from nameidata to path [PATCH] lock exclusively in collect_mounts() and drop_collected_mounts() [PATCH] move a bunch of declarations to fs/internal.h
Diffstat (limited to 'fs/seq_file.c')
-rw-r--r--fs/seq_file.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 9943408b315..cdfd996ca6e 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -25,6 +25,7 @@
* into the buffer. In case of error ->start() and ->next() return
* ERR_PTR(error). In the end of sequence they return %NULL. ->show()
* returns 0 in case of success and negative number in case of error.
+ * Returning SEQ_SKIP means "discard this element and move on".
*/
int seq_open(struct file *file, const struct seq_operations *op)
{
@@ -114,8 +115,10 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
if (!p || IS_ERR(p))
break;
err = m->op->show(m, p);
- if (err)
+ if (err < 0)
break;
+ if (unlikely(err))
+ m->count = 0;
if (m->count < m->size)
goto Fill;
m->op->stop(m, p);
@@ -140,9 +143,10 @@ Fill:
break;
}
err = m->op->show(m, p);
- if (err || m->count == m->size) {
+ if (m->count == m->size || err) {
m->count = offs;
- break;
+ if (likely(err <= 0))
+ break;
}
pos = next;
}
@@ -199,8 +203,12 @@ static int traverse(struct seq_file *m, loff_t offset)
if (IS_ERR(p))
break;
error = m->op->show(m, p);
- if (error)
+ if (error < 0)
break;
+ if (unlikely(error)) {
+ error = 0;
+ m->count = 0;
+ }
if (m->count == m->size)
goto Eoverflow;
if (pos + m->count > offset) {