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authorLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-11 18:31:05 (GMT)
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-06-11 18:31:05 (GMT)
commit5212c555be332fc95982077e6cdc7bb6cb5fff5f (patch)
tree44907e3427949462dcc54ae762cc49ae8e9571f0 /fs
parent845a2fdcbd5bc5b9f652201ee95c825827a1d521 (diff)
parent620a324b744a7d66c3c45a83042f8e7fc9fc5a04 (diff)
Merge branch 'splice-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-block
* 'splice-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-block: splice: __generic_file_splice_read: fix read/truncate race splice: __generic_file_splice_read: fix i_size_read() length checks splice: move balance_dirty_pages_ratelimited() outside of splice actor pipe: move pipe_inode_info structure decleration up before it's used splice: remove do_splice_direct() symbol export splice: move inode size check into generic_file_splice_read()
Diffstat (limited to 'fs')
-rw-r--r--fs/splice.c70
1 files changed, 35 insertions, 35 deletions
diff --git a/fs/splice.c b/fs/splice.c
index 12f2828..cb21136 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -272,7 +272,6 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
struct page *page;
pgoff_t index, end_index;
loff_t isize;
- size_t total_len;
int error, page_nr;
struct splice_pipe_desc spd = {
.pages = pages,
@@ -298,7 +297,6 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
* Now fill in the holes:
*/
error = 0;
- total_len = 0;
/*
* Lookup the (hopefully) full range of pages we need.
@@ -415,43 +413,47 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
break;
}
+ }
+fill_it:
+ /*
+ * i_size must be checked after PageUptodate.
+ */
+ isize = i_size_read(mapping->host);
+ end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
+ if (unlikely(!isize || index > end_index))
+ break;
+
+ /*
+ * if this is the last page, see if we need to shrink
+ * the length and stop
+ */
+ if (end_index == index) {
+ unsigned int plen;
/*
- * i_size must be checked after ->readpage().
+ * max good bytes in this page
*/
- isize = i_size_read(mapping->host);
- end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
- if (unlikely(!isize || index > end_index))
+ plen = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
+ if (plen <= loff)
break;
/*
- * if this is the last page, see if we need to shrink
- * the length and stop
+ * force quit after adding this page
*/
- if (end_index == index) {
- loff = PAGE_CACHE_SIZE - (isize & ~PAGE_CACHE_MASK);
- if (total_len + loff > isize)
- break;
- /*
- * force quit after adding this page
- */
- len = this_len;
- this_len = min(this_len, loff);
- loff = 0;
- }
+ this_len = min(this_len, plen - loff);
+ len = this_len;
}
-fill_it:
+
partial[page_nr].offset = loff;
partial[page_nr].len = this_len;
len -= this_len;
- total_len += this_len;
loff = 0;
spd.nr_pages++;
index++;
}
/*
- * Release any pages at the end, if we quit early. 'i' is how far
+ * Release any pages at the end, if we quit early. 'page_nr' is how far
* we got, 'nr_pages' is how many pages are in the map.
*/
while (page_nr < nr_pages)
@@ -478,10 +480,18 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
{
ssize_t spliced;
int ret;
+ loff_t isize, left;
+
+ isize = i_size_read(in->f_mapping->host);
+ if (unlikely(*ppos >= isize))
+ return 0;
+
+ left = isize - *ppos;
+ if (unlikely(left < len))
+ len = left;
ret = 0;
spliced = 0;
-
while (len) {
ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
@@ -644,7 +654,6 @@ find_page:
* accessed, we are now done!
*/
mark_page_accessed(page);
- balance_dirty_pages_ratelimited(mapping);
out:
page_cache_release(page);
unlock_page(page);
@@ -815,6 +824,7 @@ generic_file_splice_write_nolock(struct pipe_inode_info *pipe, struct file *out,
if (err)
ret = err;
}
+ balance_dirty_pages_ratelimited(mapping);
}
return ret;
@@ -868,6 +878,7 @@ generic_file_splice_write(struct pipe_inode_info *pipe, struct file *out,
if (err)
ret = err;
}
+ balance_dirty_pages_ratelimited(mapping);
}
return ret;
@@ -922,7 +933,6 @@ static long do_splice_to(struct file *in, loff_t *ppos,
struct pipe_inode_info *pipe, size_t len,
unsigned int flags)
{
- loff_t isize, left;
int ret;
if (unlikely(!in->f_op || !in->f_op->splice_read))
@@ -935,14 +945,6 @@ static long do_splice_to(struct file *in, loff_t *ppos,
if (unlikely(ret < 0))
return ret;
- isize = i_size_read(in->f_mapping->host);
- if (unlikely(*ppos >= isize))
- return 0;
-
- left = isize - *ppos;
- if (unlikely(left < len))
- len = left;
-
return in->f_op->splice_read(in, ppos, pipe, len, flags);
}
@@ -1058,8 +1060,6 @@ out_release:
return ret;
}
-EXPORT_SYMBOL(do_splice_direct);
-
/*
* After the inode slimming patch, i_pipe/i_bdev/i_cdev share the same
* location, so checking ->i_pipe is not enough to verify that this is a

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