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-rw-r--r--fs/ext4/ext4.h1
-rw-r--r--fs/ext4/extents.c14
-rw-r--r--fs/ext4/indirect.c240
-rw-r--r--fs/ext4/inode.c6
4 files changed, 250 insertions, 11 deletions
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 80246237f6d..ca9294f6b73 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2103,6 +2103,7 @@ extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks, int chunk);
extern void ext4_ind_truncate(struct inode *inode);
+extern int ext4_ind_punch_hole(struct file *file, loff_t offset, loff_t length);
/* ioctl.c */
extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 391e53a52e5..566c8f3789e 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4400,13 +4400,6 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
struct ext4_map_blocks map;
unsigned int credits, blkbits = inode->i_blkbits;
- /*
- * currently supporting (pre)allocate mode for extent-based
- * files _only_
- */
- if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
- return -EOPNOTSUPP;
-
/* Return error if mode is not supported */
if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
return -EOPNOTSUPP;
@@ -4418,6 +4411,13 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
if (ret)
return ret;
+ /*
+ * currently supporting (pre)allocate mode for extent-based
+ * files _only_
+ */
+ if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
+ return -EOPNOTSUPP;
+
trace_ext4_fallocate_enter(inode, offset, len, mode);
map.m_lblk = offset >> blkbits;
/*
diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c
index 8d83d1e508e..bdd20231e66 100644
--- a/fs/ext4/indirect.c
+++ b/fs/ext4/indirect.c
@@ -1518,3 +1518,243 @@ out_stop:
trace_ext4_truncate_exit(inode);
}
+static int free_hole_blocks(handle_t *handle, struct inode *inode,
+ struct buffer_head *parent_bh, __le32 *i_data,
+ int level, ext4_lblk_t first,
+ ext4_lblk_t count, int max)
+{
+ struct buffer_head *bh = NULL;
+ int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb);
+ int ret = 0;
+ int i, inc;
+ ext4_lblk_t offset;
+ __le32 blk;
+
+ inc = 1 << ((EXT4_BLOCK_SIZE_BITS(inode->i_sb) - 2) * level);
+ for (i = 0, offset = 0; i < max; i++, i_data++, offset += inc) {
+ if (offset >= count + first)
+ break;
+ if (*i_data == 0 || (offset + inc) <= first)
+ continue;
+ blk = *i_data;
+ if (level > 0) {
+ ext4_lblk_t first2;
+ bh = sb_bread(inode->i_sb, blk);
+ if (!bh) {
+ EXT4_ERROR_INODE_BLOCK(inode, blk,
+ "Read failure");
+ return -EIO;
+ }
+ first2 = (first > offset) ? first - offset : 0;
+ ret = free_hole_blocks(handle, inode, bh,
+ (__le32 *)bh->b_data, level - 1,
+ first2, count - offset,
+ inode->i_sb->s_blocksize >> 2);
+ if (ret) {
+ brelse(bh);
+ goto err;
+ }
+ }
+ if (level == 0 ||
+ (bh && all_zeroes((__le32 *)bh->b_data,
+ (__le32 *)bh->b_data + addr_per_block))) {
+ ext4_free_data(handle, inode, parent_bh, &blk, &blk+1);
+ *i_data = 0;
+ }
+ brelse(bh);
+ bh = NULL;
+ }
+
+err:
+ return ret;
+}
+
+static int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
+ ext4_lblk_t first, ext4_lblk_t stop)
+{
+ int addr_per_block = EXT4_ADDR_PER_BLOCK(inode->i_sb);
+ int level, ret = 0;
+ int num = EXT4_NDIR_BLOCKS;
+ ext4_lblk_t count, max = EXT4_NDIR_BLOCKS;
+ __le32 *i_data = EXT4_I(inode)->i_data;
+
+ count = stop - first;
+ for (level = 0; level < 4; level++, max *= addr_per_block) {
+ if (first < max) {
+ ret = free_hole_blocks(handle, inode, NULL, i_data,
+ level, first, count, num);
+ if (ret)
+ goto err;
+ if (count > max - first)
+ count -= max - first;
+ else
+ break;
+ first = 0;
+ } else {
+ first -= max;
+ }
+ i_data += num;
+ if (level == 0) {
+ num = 1;
+ max = 1;
+ }
+ }
+
+err:
+ return ret;
+}
+
+int ext4_ind_punch_hole(struct file *file, loff_t offset, loff_t length)
+{
+ struct inode *inode = file->f_path.dentry->d_inode;
+ struct super_block *sb = inode->i_sb;
+ ext4_lblk_t first_block, stop_block;
+ struct address_space *mapping = inode->i_mapping;
+ handle_t *handle = NULL;
+ loff_t first_page, last_page, page_len;
+ loff_t first_page_offset, last_page_offset;
+ int err = 0;
+
+ /*
+ * Write out all dirty pages to avoid race conditions
+ * Then release them.
+ */
+ if (mapping->nrpages && mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) {
+ err = filemap_write_and_wait_range(mapping,
+ offset, offset + length - 1);
+ if (err)
+ return err;
+ }
+
+ mutex_lock(&inode->i_mutex);
+ /* It's not possible punch hole on append only file */
+ if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) {
+ err = -EPERM;
+ goto out_mutex;
+ }
+ if (IS_SWAPFILE(inode)) {
+ err = -ETXTBSY;
+ goto out_mutex;
+ }
+
+ /* No need to punch hole beyond i_size */
+ if (offset >= inode->i_size)
+ goto out_mutex;
+
+ /*
+ * If the hole extents beyond i_size, set the hole
+ * to end after the page that contains i_size
+ */
+ if (offset + length > inode->i_size) {
+ length = inode->i_size +
+ PAGE_CACHE_SIZE - (inode->i_size & (PAGE_CACHE_SIZE - 1)) -
+ offset;
+ }
+
+ first_page = (offset + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+ last_page = (offset + length) >> PAGE_CACHE_SHIFT;
+
+ first_page_offset = first_page << PAGE_CACHE_SHIFT;
+ last_page_offset = last_page << PAGE_CACHE_SHIFT;
+
+ /* Now release the pages */
+ if (last_page_offset > first_page_offset) {
+ truncate_pagecache_range(inode, first_page_offset,
+ last_page_offset - 1);
+ }
+
+ /* Wait all existing dio works, newcomers will block on i_mutex */
+ inode_dio_wait(inode);
+
+ handle = start_transaction(inode);
+ if (IS_ERR(handle))
+ goto out_mutex;
+
+ /*
+ * Now we need to zero out the non-page-aligned data in the
+ * pages at the start and tail of the hole, and unmap the buffer
+ * heads for the block aligned regions of the page that were
+ * completely zerod.
+ */
+ if (first_page > last_page) {
+ /*
+ * If the file space being truncated is contained within a page
+ * just zero out and unmap the middle of that page
+ */
+ err = ext4_discard_partial_page_buffers(handle,
+ mapping, offset, length, 0);
+ if (err)
+ goto out;
+ } else {
+ /*
+ * Zero out and unmap the paritial page that contains
+ * the start of the hole
+ */
+ page_len = first_page_offset - offset;
+ if (page_len > 0) {
+ err = ext4_discard_partial_page_buffers(handle, mapping,
+ offset, page_len, 0);
+ if (err)
+ goto out;
+ }
+
+ /*
+ * Zero out and unmap the partial page that contains
+ * the end of the hole
+ */
+ page_len = offset + length - last_page_offset;
+ if (page_len > 0) {
+ err = ext4_discard_partial_page_buffers(handle, mapping,
+ last_page_offset, page_len, 0);
+ if (err)
+ goto out;
+ }
+ }
+
+ /*
+ * If i_size contained in the last page, we need to
+ * unmap and zero the paritial page after i_size
+ */
+ if (inode->i_size >> PAGE_CACHE_SHIFT == last_page &&
+ inode->i_size % PAGE_CACHE_SIZE != 0) {
+ page_len = PAGE_CACHE_SIZE -
+ (inode->i_size & (PAGE_CACHE_SIZE - 1));
+ if (page_len > 0) {
+ err = ext4_discard_partial_page_buffers(handle,
+ mapping, inode->i_size, page_len, 0);
+ if (err)
+ goto out;
+ }
+ }
+
+ first_block = (offset + sb->s_blocksize - 1) >>
+ EXT4_BLOCK_SIZE_BITS(sb);
+ stop_block = (offset + length) >> EXT4_BLOCK_SIZE_BITS(sb);
+
+ if (first_block >= stop_block)
+ goto out;
+
+ down_write(&EXT4_I(inode)->i_data_sem);
+ ext4_discard_preallocations(inode);
+
+ err = ext4_es_remove_extent(inode, first_block,
+ stop_block - first_block);
+ err = ext4_free_hole_blocks(handle, inode, first_block, stop_block);
+
+ ext4_discard_preallocations(inode);
+
+ if (IS_SYNC(inode))
+ ext4_handle_sync(handle);
+
+ up_write(&EXT4_I(inode)->i_data_sem);
+
+out:
+ inode->i_mtime = inode->i_ctime = ext4_current_time(inode);
+ ext4_mark_inode_dirty(handle, inode);
+ ext4_journal_stop(handle);
+
+out_mutex:
+ mutex_unlock(&inode->i_mutex);
+
+ return err;
+}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 5abf89c100b..80683bf0df1 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3557,10 +3557,8 @@ int ext4_punch_hole(struct file *file, loff_t offset, loff_t length)
if (!S_ISREG(inode->i_mode))
return -EOPNOTSUPP;
- if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)) {
- /* TODO: Add support for non extent hole punching */
- return -EOPNOTSUPP;
- }
+ if (!ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))
+ return ext4_ind_punch_hole(file, offset, length);
if (EXT4_SB(inode->i_sb)->s_cluster_ratio > 1) {
/* TODO: Add support for bigalloc file systems */
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-01 19:51:55 +0000