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ocfs2: support for removing file regions

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Provide an internal interface for the removal of arbitrary file regions.

ocfs2_remove_inode_range() takes a byte range within a file and will remove
existing extents within that range. Partial clusters will be zeroed so that
any read from within the region will return zeros.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh
2007-07-03 13:34:11 -07:00
parent 35edec1d52
commit 063c4561f5
4 changed files with 262 additions and 12 deletions
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20
fs/ocfs2/alloc.c
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@@ -4373,10 +4373,10 @@ out:
return ret;
}
static int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
u32 cpos, u32 len, handle_t *handle,
struct ocfs2_alloc_context *meta_ac,
struct ocfs2_cached_dealloc_ctxt *dealloc)
int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
u32 cpos, u32 len, handle_t *handle,
struct ocfs2_alloc_context *meta_ac,
struct ocfs2_cached_dealloc_ctxt *dealloc)
{
int ret, index;
u32 rec_range, trunc_range;
@@ -4506,7 +4506,7 @@ out:
return ret;
}
static inline int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb)
int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb)
{
struct buffer_head *tl_bh = osb->osb_tl_bh;
struct ocfs2_dinode *di;
@@ -4539,10 +4539,10 @@ static int ocfs2_truncate_log_can_coalesce(struct ocfs2_truncate_log *tl,
return current_tail == new_start;
}
static int ocfs2_truncate_log_append(struct ocfs2_super *osb,
handle_t *handle,
u64 start_blk,
unsigned int num_clusters)
int ocfs2_truncate_log_append(struct ocfs2_super *osb,
handle_t *handle,
u64 start_blk,
unsigned int num_clusters)
{
int status, index;
unsigned int start_cluster, tl_count;
@@ -4698,7 +4698,7 @@ bail:
}
/* Expects you to already be holding tl_inode->i_mutex */
static int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
{
int status;
unsigned int num_to_flush;