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Btrfs: Implement basic support for -ENOSPC

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This is intended to prevent accidentally filling the drive.  A determined
user can still make things oops.

It includes some accounting of the current bytes under delayed allocation,
but this will change as things get optimized

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2007-12-21 16:27:21 -05:00
parent 01f4665805
commit 1832a6d5ee
6 changed files with 193 additions and 28 deletions
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fs/btrfs/file.c
+24 -4
View File
@@ -307,6 +307,7 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
inline_size > 32768 ||
inline_size >= BTRFS_MAX_INLINE_DATA_SIZE(root)) {
u64 last_end;
u64 existing_delalloc = 0;
for (i = 0; i < num_pages; i++) {
struct page *p = pages[i];
@@ -316,8 +317,19 @@ static int dirty_and_release_pages(struct btrfs_trans_handle *trans,
last_end = (u64)(pages[num_pages -1]->index) <<
PAGE_CACHE_SHIFT;
last_end += PAGE_CACHE_SIZE - 1;
if (start_pos < isize) {
u64 delalloc_start = start_pos;
existing_delalloc = count_range_bits(em_tree,
&delalloc_start,
end_of_last_block, (u64)-1,
EXTENT_DELALLOC);
}
set_extent_delalloc(em_tree, start_pos, end_of_last_block,
GFP_NOFS);
spin_lock(&root->fs_info->delalloc_lock);
root->fs_info->delalloc_bytes += (end_of_last_block + 1 -
start_pos) - existing_delalloc;
spin_unlock(&root->fs_info->delalloc_lock);
} else {
u64 aligned_end;
/* step one, delete the existing extents in this range */
@@ -708,12 +720,12 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
current->backing_dev_info = inode->i_mapping->backing_dev_info;
err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
if (err)
goto out;
goto out_nolock;
if (count == 0)
goto out;
goto out_nolock;
err = remove_suid(fdentry(file));
if (err)
goto out;
goto out_nolock;
file_update_time(file);
pages = kmalloc(nrptrs * sizeof(struct page *), GFP_KERNEL);
@@ -758,6 +770,13 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
WARN_ON(num_pages > nrptrs);
memset(pages, 0, sizeof(pages));
mutex_lock(&root->fs_info->fs_mutex);
ret = btrfs_check_free_space(root, write_bytes, 0);
mutex_unlock(&root->fs_info->fs_mutex);
if (ret)
goto out;
ret = prepare_pages(root, file, pages, num_pages,
pos, first_index, last_index,
write_bytes);
@@ -787,8 +806,9 @@ static ssize_t btrfs_file_write(struct file *file, const char __user *buf,
btrfs_btree_balance_dirty(root, 1);
cond_resched();
}
mutex_unlock(&inode->i_mutex);
out:
mutex_unlock(&inode->i_mutex);
out_nolock:
kfree(pages);
if (pinned[0])
page_cache_release(pinned[0]);