Displaying 2 results from an estimated 2 matches for "iov_iter_copy_from_us".
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iov_iter_copy_from_user
2010 Dec 07
9
[PATCH] Btrfs: pwrite blocked when writing from the mmaped buffer of the same page
...PAGE_CACHE_SIZE - offset, write_bytes);
struct page *page = prepared_pages[pg];
again:
- /*
- * Copy data from userspace to the current page
- *
- * Disable pagefault to avoid recursive lock since the pages
- * are already locked
- */
- pagefault_disable();
- copied = iov_iter_copy_from_user_atomic(page, i, offset, count);
- pagefault_enable();
+ if (unlikely(iov_iter_fault_in_readable(i, count)))
+ return -EFAULT;
+
+ /* Copy data from userspace to the current page */
+ copied = iov_iter_copy_from_user(page, i, offset, count);
/* Flush processor''s dcache for this...
2010 May 07
6
[PATCH 1/5] fs: allow short direct-io reads to be completed via buffered IO V2
V1->V2: Check to see if our current ppos is >= i_size after a short DIO read,
just in case it was actually a short read and we need to just return.
This is similar to what already happens in the write case. If we have a short
read while doing O_DIRECT, instead of just returning, fallthrough and try to
read the rest via buffered IO. BTRFS needs this because if we encounter a
compressed or