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ocfs2: small cleanup of ocfs2_write_begin_nolock() 

We can easily seperate out the write descriptor setup and manipulation
into helper functions.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
This commit is contained in:
Mark Fasheh 2007-05-14 18:09:54 -07:00
parent 328d5752e1
commit 0d172baa55
1 changed files with 76 additions and 32 deletions
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108
fs/ocfs2/aops.c
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@ -1188,6 +1188,31 @@ out:
return ret;
}
static int ocfs2_write_cluster_by_desc(struct address_space *mapping,
struct ocfs2_alloc_context *data_ac,
struct ocfs2_alloc_context *meta_ac,
struct ocfs2_write_ctxt *wc,
loff_t pos, unsigned len)
{
int ret, i;
struct ocfs2_write_cluster_desc *desc;
for (i = 0; i < wc->w_clen; i++) {
desc = &wc->w_desc[i];
ret = ocfs2_write_cluster(mapping, desc->c_phys, data_ac,
meta_ac, wc, desc->c_cpos, pos, len);
if (ret) {
mlog_errno(ret);
goto out;
}
}
ret = 0;
out:
return ret;
}
/*
* ocfs2_write_end() wants to know which parts of the target page it
* should complete the write on. It's easiest to compute them ahead of
@ -1240,30 +1265,19 @@ static void ocfs2_set_target_boundaries(struct ocfs2_super *osb,
}
}
int ocfs2_write_begin_nolock(struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata,
struct buffer_head *di_bh, struct page *mmap_page)
/*
* Populate each single-cluster write descriptor in the write context
* with information about the i/o to be done.
*/
static int ocfs2_populate_write_desc(struct inode *inode,
struct ocfs2_write_ctxt *wc,
unsigned int *clusters_to_alloc)
{
int ret, i, credits = OCFS2_INODE_UPDATE_CREDITS;
unsigned int num_clusters = 0, clusters_to_alloc = 0;
u32 phys = 0;
struct ocfs2_write_ctxt *wc;
struct inode *inode = mapping->host;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_dinode *di;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
handle_t *handle;
int ret;
struct ocfs2_write_cluster_desc *desc;
ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
if (ret) {
mlog_errno(ret);
return ret;
}
di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
unsigned int num_clusters = 0;
u32 phys = 0;
int i;
for (i = 0; i < wc->w_clen; i++) {
desc = &wc->w_desc[i];
@ -1287,12 +1301,46 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
desc->c_phys = phys;
if (phys == 0) {
desc->c_new = 1;
clusters_to_alloc++;
*clusters_to_alloc = *clusters_to_alloc + 1;
}
num_clusters--;
}
ret = 0;
out:
return ret;
}
int ocfs2_write_begin_nolock(struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata,
struct buffer_head *di_bh, struct page *mmap_page)
{
int ret, credits = OCFS2_INODE_UPDATE_CREDITS;
unsigned int clusters_to_alloc = 0;
struct ocfs2_write_ctxt *wc;
struct inode *inode = mapping->host;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
struct ocfs2_dinode *di;
struct ocfs2_alloc_context *data_ac = NULL;
struct ocfs2_alloc_context *meta_ac = NULL;
handle_t *handle;
ret = ocfs2_alloc_write_ctxt(&wc, osb, pos, len, di_bh);
if (ret) {
mlog_errno(ret);
return ret;
}
ret = ocfs2_populate_write_desc(inode, wc, &clusters_to_alloc);
if (ret) {
mlog_errno(ret);
goto out;
}
di = (struct ocfs2_dinode *)wc->w_di_bh->b_data;
/*
* We set w_target_from, w_target_to here so that
* ocfs2_write_end() knows which range in the target page to
@ -1351,15 +1399,11 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
goto out_commit;
}
for (i = 0; i < wc->w_clen; i++) {
desc = &wc->w_desc[i];
ret = ocfs2_write_cluster(mapping, desc->c_phys, data_ac,
meta_ac, wc, desc->c_cpos, pos, len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
ret = ocfs2_write_cluster_by_desc(mapping, data_ac, meta_ac, wc, pos,
len);
if (ret) {
mlog_errno(ret);
goto out_commit;
}
if (data_ac)