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Turn gfs2_block_truncate_page into gfs2_block_zero_range

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Turn gfs2_block_truncate_page into a function that zeroes a range within
a block rather than only the end of a block.  This will be used for
cleaning the end of the first partial block and the start of the last
partial block when punching a hole in a file.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2017-12-13 20:10:38 +01:00 committed by Bob Peterson
parent cb7f0903ef
commit bdba0d5ec1
1 changed files with 10 additions and 8 deletions
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18
fs/gfs2/bmap.c
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@ -904,17 +904,18 @@ int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsi
}
/**
* gfs2_block_truncate_page - Deal with zeroing out data for truncate
* gfs2_block_zero_range - Deal with zeroing out data
*
* This is partly borrowed from ext3.
*/
static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
static int gfs2_block_zero_range(struct inode *inode, loff_t from,
unsigned int length)
{
struct inode *inode = mapping->host;
struct address_space *mapping = inode->i_mapping;
struct gfs2_inode *ip = GFS2_I(inode);
unsigned long index = from >> PAGE_SHIFT;
unsigned offset = from & (PAGE_SIZE-1);
unsigned blocksize, iblock, length, pos;
unsigned blocksize, iblock, pos;
struct buffer_head *bh;
struct page *page;
int err;
@ -924,7 +925,6 @@ static int gfs2_block_truncate_page(struct address_space *mapping, loff_t from)
return 0;
blocksize = inode->i_sb->s_blocksize;
length = blocksize - (offset & (blocksize - 1));
iblock = index << (PAGE_SHIFT - inode->i_sb->s_blocksize_bits);
if (!page_has_buffers(page))
@ -1025,7 +1025,6 @@ static int trunc_start(struct inode *inode, u64 newsize)
{
struct gfs2_inode *ip = GFS2_I(inode);
struct gfs2_sbd *sdp = GFS2_SB(inode);
struct address_space *mapping = inode->i_mapping;
struct buffer_head *dibh = NULL;
int journaled = gfs2_is_jdata(ip);
u64 oldsize = inode->i_size;
@ -1047,8 +1046,11 @@ static int trunc_start(struct inode *inode, u64 newsize)
if (gfs2_is_stuffed(ip)) {
gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode) + newsize);
} else {
if (newsize & (u64)(sdp->sd_sb.sb_bsize - 1)) {
error = gfs2_block_truncate_page(mapping, newsize);
unsigned int blocksize = i_blocksize(inode);
unsigned int offs = newsize & (blocksize - 1);
if (offs) {
error = gfs2_block_zero_range(inode, newsize,
blocksize - offs);
if (error)
goto out;
}