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authorMark Fasheh <mark.fasheh@oracle.com>2006-12-14 13:01:05 -0800
committerMark Fasheh <mark.fasheh@oracle.com>2006-12-28 16:38:08 -0800
commit564f8a3228879d6962edb3432d01bcd7499a67ec (patch)
tree6e3a1b840e3061e7a1bc4df56287a99c2f513a47 /fs/ocfs2
parent0333394bff439c3fb09264303de42e7038b3e709 (diff)
downloadop-kernel-dev-564f8a3228879d6962edb3432d01bcd7499a67ec.zip
op-kernel-dev-564f8a3228879d6962edb3432d01bcd7499a67ec.tar.gz
ocfs2: Allow direct I/O read past end of file
ocfs2_direct_IO_get_blocks() was incorrectly returning -EIO for a direct I/O read whose start block was past the end of the file allocation tree. Fix things so that we return a hole instead. do_direct_IO() will then notice that the range start is past eof and return a short read. While there, remove the unused vbo_max variable. Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Diffstat (limited to 'fs/ocfs2')
-rw-r--r--fs/ocfs2/aops.c24
1 files changed, 17 insertions, 7 deletions
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index ef6cd30..93628b0 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -540,8 +540,7 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create)
{
int ret;
- u64 vbo_max; /* file offset, max_blocks from iblock */
- u64 p_blkno;
+ u64 p_blkno, inode_blocks;
int contig_blocks;
unsigned char blocksize_bits = inode->i_sb->s_blocksize_bits;
unsigned long max_blocks = bh_result->b_size >> inode->i_blkbits;
@@ -550,12 +549,23 @@ static int ocfs2_direct_IO_get_blocks(struct inode *inode, sector_t iblock,
* nicely aligned and of the right size, so there's no need
* for us to check any of that. */
- vbo_max = ((u64)iblock + max_blocks) << blocksize_bits;
-
spin_lock(&OCFS2_I(inode)->ip_lock);
- if ((iblock + max_blocks) >
- ocfs2_clusters_to_blocks(inode->i_sb,
- OCFS2_I(inode)->ip_clusters)) {
+ inode_blocks = ocfs2_clusters_to_blocks(inode->i_sb,
+ OCFS2_I(inode)->ip_clusters);
+
+ /*
+ * For a read which begins past the end of file, we return a hole.
+ */
+ if (!create && (iblock >= inode_blocks)) {
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+ ret = 0;
+ goto bail;
+ }
+
+ /*
+ * Any write past EOF is not allowed because we'd be extending.
+ */
+ if (create && (iblock + max_blocks) > inode_blocks) {
spin_unlock(&OCFS2_I(inode)->ip_lock);
ret = -EIO;
goto bail;
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