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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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4
fs/btrfs/ctree.h
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@@ -346,6 +346,8 @@ struct btrfs_fs_info {
int closing;
u64 total_pinned;
spinlock_t delalloc_lock;
u64 delalloc_bytes;
};
/*
* in ram representation of the tree. extent_root is used for all allocations
@@ -1115,6 +1117,8 @@ int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
struct btrfs_root *root, struct btrfs_path *path,
u64 isize);
/* inode.c */
int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
int for_del);
int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
int btrfs_readpage(struct file *file, struct page *page);
void btrfs_delete_inode(struct inode *inode);