GFS2: call gfs2_write_alloc_required for each chunk (58a7d5fb) · Commits · 戴 / test

gfs2_fallocate was calling gfs2_write_alloc_required() once at the start of the function. This caused problems since gfs2_write_alloc_required used a long unsigned int for the len, but gfs2_fallocate could allocate a much larger amount. This patch will move the call into the loop where the chunks are actually allocated and zeroed out. This will keep the allocation size under the limit, and also allow gfs2_fallocate to quickly skip over sections of the file that are already completely allocated. fallcate_chunk was also not correctly setting the file size. It was using the len veriable to find the last block written to, but by the time it was setting the size, the len variable had already been decremented to 0. Signed-off-by:

Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by:

Steven Whitehouse <swhiteho@redhat.com>

fs/gfs2/file.c

+8 −5

Original line number	Diff line number	Diff line
		@@ -676,6 +676,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
		struct gfs2_inode *ip = GFS2_I(inode);
		struct buffer_head *dibh;
		int error;
		loff_t size = len;
		unsigned int nr_blks;
		sector_t lblock = offset >> inode->i_blkbits;

		@@ -709,8 +710,8 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
		goto out;
		}
		}
		if (offset + len > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
		i_size_write(inode, offset + len);
		if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
		i_size_write(inode, offset + size);

		mark_inode_dirty(inode);

		@@ -779,12 +780,14 @@ static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
		if (unlikely(error))
		goto out_uninit;

		if (!gfs2_write_alloc_required(ip, offset, len))
		goto out_unlock;

		while (len > 0) {
		if (len < bytes)
		bytes = len;
		if (!gfs2_write_alloc_required(ip, offset, bytes)) {
		len -= bytes;
		offset += bytes;
		continue;
		}
		qa = gfs2_qadata_get(ip);
		if (!qa) {
		error = -ENOMEM;

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