From f4e420dc423148fba637af1ab618fa8896dfb2d6 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Fri, 4 Jun 2010 11:29:56 +0200 Subject: clean up write_begin usage for directories in pagecache For filesystem that implement directories in pagecache we call block_write_begin with an already allocated page for this code, while the normal regular file write path uses the default block_write_begin behaviour. Get rid of the __foofs_write_begin helper and opencode the normal write_begin call in foofs_write_begin, while adding a new foofs_prepare_chunk helper for the directory code. The added benefit is that foofs_prepare_chunk has a much saner calling convention. Note that the interruptible flag passed into block_write_begin is always ignored if we already pass in a page (see next patch for details), and we never were doing truncations of exessive blocks for this case either so we can switch directly to block_write_begin_newtrunc. Signed-off-by: Christoph Hellwig Signed-off-by: Al Viro --- fs/sysv/dir.c | 21 +++++++-------------- fs/sysv/itree.c | 11 +++++------ fs/sysv/sysv.h | 4 +--- 3 files changed, 13 insertions(+), 23 deletions(-) (limited to 'fs/sysv') diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c index 79941e4964a..a77c4215762 100644 --- a/fs/sysv/dir.c +++ b/fs/sysv/dir.c @@ -218,8 +218,7 @@ got_it: pos = page_offset(page) + (char*)de - (char*)page_address(page); lock_page(page); - err = __sysv_write_begin(NULL, page->mapping, pos, SYSV_DIRSIZE, - AOP_FLAG_UNINTERRUPTIBLE, &page, NULL); + err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE); if (err) goto out_unlock; memcpy (de->name, name, namelen); @@ -239,15 +238,13 @@ out_unlock: int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page) { - struct address_space *mapping = page->mapping; - struct inode *inode = (struct inode*)mapping->host; + struct inode *inode = page->mapping->host; char *kaddr = (char*)page_address(page); loff_t pos = page_offset(page) + (char *)de - kaddr; int err; lock_page(page); - err = __sysv_write_begin(NULL, mapping, pos, SYSV_DIRSIZE, - AOP_FLAG_UNINTERRUPTIBLE, &page, NULL); + err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE); BUG_ON(err); de->inode = 0; err = dir_commit_chunk(page, pos, SYSV_DIRSIZE); @@ -259,16 +256,14 @@ int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page) int sysv_make_empty(struct inode *inode, struct inode *dir) { - struct address_space *mapping = inode->i_mapping; - struct page *page = grab_cache_page(mapping, 0); + struct page *page = grab_cache_page(inode->i_mapping, 0); struct sysv_dir_entry * de; char *base; int err; if (!page) return -ENOMEM; - err = __sysv_write_begin(NULL, mapping, 0, 2 * SYSV_DIRSIZE, - AOP_FLAG_UNINTERRUPTIBLE, &page, NULL); + err = sysv_prepare_chunk(page, 0, 2 * SYSV_DIRSIZE); if (err) { unlock_page(page); goto fail; @@ -341,15 +336,13 @@ not_empty: void sysv_set_link(struct sysv_dir_entry *de, struct page *page, struct inode *inode) { - struct address_space *mapping = page->mapping; - struct inode *dir = mapping->host; + struct inode *dir = page->mapping->host; loff_t pos = page_offset(page) + (char *)de-(char*)page_address(page); int err; lock_page(page); - err = __sysv_write_begin(NULL, mapping, pos, SYSV_DIRSIZE, - AOP_FLAG_UNINTERRUPTIBLE, &page, NULL); + err = sysv_prepare_chunk(page, pos, SYSV_DIRSIZE); BUG_ON(err); de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino); err = dir_commit_chunk(page, pos, SYSV_DIRSIZE); diff --git a/fs/sysv/itree.c b/fs/sysv/itree.c index f042eec464c..4068f485cfd 100644 --- a/fs/sysv/itree.c +++ b/fs/sysv/itree.c @@ -459,12 +459,10 @@ static int sysv_readpage(struct file *file, struct page *page) return block_read_full_page(page,get_block); } -int __sysv_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata) +int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len) { - return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, - get_block); + return block_write_begin_newtrunc(NULL, page->mapping, pos, len, 0, + &page, NULL, get_block); } static int sysv_write_begin(struct file *file, struct address_space *mapping, @@ -472,7 +470,8 @@ static int sysv_write_begin(struct file *file, struct address_space *mapping, struct page **pagep, void **fsdata) { *pagep = NULL; - return __sysv_write_begin(file, mapping, pos, len, flags, pagep, fsdata); + return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata, + get_block); } static sector_t sysv_bmap(struct address_space *mapping, sector_t block) diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h index 94cb9b4d76c..bb55cdb394b 100644 --- a/fs/sysv/sysv.h +++ b/fs/sysv/sysv.h @@ -136,9 +136,7 @@ extern unsigned long sysv_count_free_blocks(struct super_block *); /* itree.c */ extern void sysv_truncate(struct inode *); -extern int __sysv_write_begin(struct file *file, struct address_space *mapping, - loff_t pos, unsigned len, unsigned flags, - struct page **pagep, void **fsdata); +extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len); /* inode.c */ extern struct inode *sysv_iget(struct super_block *, unsigned int); -- cgit v1.2.3-18-g5258