Btrfs: convert to the new truncate sequence
->truncate() is going away, instead all of the work needs to be done in ->setattr(). So this converts us over to do this. It's fairly straightforward, just get rid of our .truncate inode operation and call btrfs_truncate() directly from btrfs_setsize. This works out better for us since truncate can technically return ENOSPC, and before we had no way of letting anybody know. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik
Родитель
dc89e98244
Коммит
a41ad394a0
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@ -2537,7 +2537,7 @@ void btrfs_orphan_post_snapshot(struct btrfs_trans_handle *trans,
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struct btrfs_pending_snapshot *pending);
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void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans,
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struct btrfs_root *root);
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int btrfs_cont_expand(struct inode *inode, loff_t size);
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int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size);
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int btrfs_invalidate_inodes(struct btrfs_root *root);
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void btrfs_add_delayed_iput(struct inode *inode);
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void btrfs_run_delayed_iputs(struct btrfs_root *root);
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@ -817,7 +817,7 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
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last_pos = ((u64)index + num_pages) << PAGE_CACHE_SHIFT;
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if (start_pos > inode->i_size) {
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err = btrfs_cont_expand(inode, start_pos);
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err = btrfs_cont_expand(inode, i_size_read(inode), start_pos);
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if (err)
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return err;
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}
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@ -1330,7 +1330,8 @@ static long btrfs_fallocate(struct file *file, int mode,
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goto out;
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if (alloc_start > inode->i_size) {
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ret = btrfs_cont_expand(inode, alloc_start);
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ret = btrfs_cont_expand(inode, i_size_read(inode),
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alloc_start);
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if (ret)
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goto out;
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}
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@ -84,7 +84,8 @@ static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
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[S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
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};
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static void btrfs_truncate(struct inode *inode);
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static int btrfs_setsize(struct inode *inode, loff_t newsize);
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static int btrfs_truncate(struct inode *inode);
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static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end);
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static noinline int cow_file_range(struct inode *inode,
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struct page *locked_page,
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@ -2371,6 +2372,11 @@ void btrfs_orphan_cleanup(struct btrfs_root *root)
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/* if we have links, this was a truncate, lets do that */
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if (inode->i_nlink) {
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if (!S_ISREG(inode->i_mode)) {
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WARN_ON(1);
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iput(inode);
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continue;
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}
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nr_truncate++;
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btrfs_truncate(inode);
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} else {
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@ -3538,7 +3544,7 @@ out:
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return ret;
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}
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int btrfs_cont_expand(struct inode *inode, loff_t size)
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int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
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{
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root = BTRFS_I(inode)->root;
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@ -3546,7 +3552,7 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
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struct extent_map *em = NULL;
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struct extent_state *cached_state = NULL;
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u64 mask = root->sectorsize - 1;
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u64 hole_start = (inode->i_size + mask) & ~mask;
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u64 hole_start = (oldsize + mask) & ~mask;
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u64 block_end = (size + mask) & ~mask;
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u64 last_byte;
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u64 cur_offset;
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@ -3617,27 +3623,17 @@ int btrfs_cont_expand(struct inode *inode, loff_t size)
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return err;
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}
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static int btrfs_setattr_size(struct inode *inode, struct iattr *attr)
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static int btrfs_setsize(struct inode *inode, loff_t newsize)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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struct btrfs_trans_handle *trans;
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loff_t oldsize = i_size_read(inode);
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unsigned long nr;
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int ret;
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if (attr->ia_size == inode->i_size)
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if (newsize == oldsize)
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return 0;
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if (attr->ia_size > inode->i_size) {
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unsigned long limit;
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limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
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if (attr->ia_size > inode->i_sb->s_maxbytes)
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return -EFBIG;
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if (limit != RLIM_INFINITY && attr->ia_size > limit) {
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send_sig(SIGXFSZ, current, 0);
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return -EFBIG;
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}
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}
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trans = btrfs_start_transaction(root, 5);
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if (IS_ERR(trans))
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return PTR_ERR(trans);
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@ -3651,16 +3647,16 @@ static int btrfs_setattr_size(struct inode *inode, struct iattr *attr)
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btrfs_end_transaction(trans, root);
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btrfs_btree_balance_dirty(root, nr);
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if (attr->ia_size > inode->i_size) {
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ret = btrfs_cont_expand(inode, attr->ia_size);
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if (newsize > oldsize) {
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i_size_write(inode, newsize);
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btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL);
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truncate_pagecache(inode, oldsize, newsize);
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ret = btrfs_cont_expand(inode, oldsize, newsize);
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if (ret) {
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btrfs_truncate(inode);
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btrfs_setsize(inode, oldsize);
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return ret;
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}
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i_size_write(inode, attr->ia_size);
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btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
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trans = btrfs_start_transaction(root, 0);
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BUG_ON(IS_ERR(trans));
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btrfs_set_trans_block_group(trans, inode);
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@ -3676,22 +3672,22 @@ static int btrfs_setattr_size(struct inode *inode, struct iattr *attr)
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nr = trans->blocks_used;
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btrfs_end_transaction(trans, root);
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btrfs_btree_balance_dirty(root, nr);
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return 0;
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} else {
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/*
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* We're truncating a file that used to have good data down to
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* zero. Make sure it gets into the ordered flush list so that
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* any new writes get down to disk quickly.
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*/
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if (newsize == 0)
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BTRFS_I(inode)->ordered_data_close = 1;
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/* we don't support swapfiles, so vmtruncate shouldn't fail */
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truncate_setsize(inode, newsize);
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ret = btrfs_truncate(inode);
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}
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/*
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* We're truncating a file that used to have good data down to
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* zero. Make sure it gets into the ordered flush list so that
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* any new writes get down to disk quickly.
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*/
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if (attr->ia_size == 0)
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BTRFS_I(inode)->ordered_data_close = 1;
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/* we don't support swapfiles, so vmtruncate shouldn't fail */
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ret = vmtruncate(inode, attr->ia_size);
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BUG_ON(ret);
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return 0;
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return ret;
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}
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static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
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@ -3708,7 +3704,7 @@ static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
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return err;
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if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) {
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err = btrfs_setattr_size(inode, attr);
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err = btrfs_setsize(inode, attr->ia_size);
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if (err)
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return err;
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}
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@ -6478,7 +6474,7 @@ out:
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return ret;
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}
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static void btrfs_truncate(struct inode *inode)
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static int btrfs_truncate(struct inode *inode)
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{
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struct btrfs_root *root = BTRFS_I(inode)->root;
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int ret;
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@ -6486,14 +6482,9 @@ static void btrfs_truncate(struct inode *inode)
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unsigned long nr;
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u64 mask = root->sectorsize - 1;
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if (!S_ISREG(inode->i_mode)) {
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WARN_ON(1);
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return;
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}
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ret = btrfs_truncate_page(inode->i_mapping, inode->i_size);
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if (ret)
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return;
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return ret;
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btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1);
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btrfs_ordered_update_i_size(inode, inode->i_size, NULL);
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@ -6568,6 +6559,8 @@ static void btrfs_truncate(struct inode *inode)
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ret = btrfs_end_transaction_throttle(trans, root);
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BUG_ON(ret);
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btrfs_btree_balance_dirty(root, nr);
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return ret;
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}
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/*
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@ -7367,7 +7360,6 @@ static const struct address_space_operations btrfs_symlink_aops = {
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};
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static const struct inode_operations btrfs_file_inode_operations = {
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.truncate = btrfs_truncate,
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.getattr = btrfs_getattr,
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.setattr = btrfs_setattr,
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.setxattr = btrfs_setxattr,
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