From 8dd6c7b2944ce349f06db763d7a2a90a0b83ba0d Mon Sep 17 00:00:00 2001 From: "Fabio M. De Francesco" Date: Thu, 19 Jan 2023 16:32:30 +0100 Subject: [PATCH] fs/sysv: Change the signature of dir_get_page() Change the signature of dir_get_page() in order to prepare this function to the conversion to the use of kmap_local_page(). Change also those call sites which are required to adjust to the new signature. Cc: Ira Weiny Suggested-by: Al Viro Signed-off-by: Fabio M. De Francesco Signed-off-by: Al Viro --- fs/sysv/dir.c | 53 +++++++++++++++++++++++---------------------------- 1 file changed, 24 insertions(+), 29 deletions(-) diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c index 0edd18e1d376..ad334c8ef7b1 100644 --- a/fs/sysv/dir.c +++ b/fs/sysv/dir.c @@ -57,13 +57,15 @@ static int sysv_handle_dirsync(struct inode *dir) return err; } -static struct page * dir_get_page(struct inode *dir, unsigned long n) +static void *dir_get_page(struct inode *dir, unsigned long n, struct page **p) { struct address_space *mapping = dir->i_mapping; struct page *page = read_mapping_page(mapping, n, NULL); - if (!IS_ERR(page)) - kmap(page); - return page; + if (IS_ERR(page)) + return ERR_CAST(page); + kmap(page); + *p = page; + return page_address(page); } static int sysv_readdir(struct file *file, struct dir_context *ctx) @@ -85,11 +87,11 @@ static int sysv_readdir(struct file *file, struct dir_context *ctx) for ( ; n < npages; n++, offset = 0) { char *kaddr, *limit; struct sysv_dir_entry *de; - struct page *page = dir_get_page(inode, n); + struct page *page; - if (IS_ERR(page)) + kaddr = dir_get_page(inode, n, &page); + if (IS_ERR(kaddr)) continue; - kaddr = (char *)page_address(page); de = (struct sysv_dir_entry *)(kaddr+offset); limit = kaddr + PAGE_SIZE - SYSV_DIRSIZE; for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) { @@ -147,11 +149,10 @@ struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_ n = start; do { - char *kaddr; - page = dir_get_page(dir, n); - if (!IS_ERR(page)) { - kaddr = (char*)page_address(page); - de = (struct sysv_dir_entry *) kaddr; + char *kaddr = dir_get_page(dir, n, &page); + + if (!IS_ERR(kaddr)) { + de = (struct sysv_dir_entry *)kaddr; kaddr += PAGE_SIZE - SYSV_DIRSIZE; for ( ; (char *) de <= kaddr ; de++) { if (!de->inode) @@ -190,11 +191,9 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode) /* We take care of directory expansion in the same loop */ for (n = 0; n <= npages; n++) { - page = dir_get_page(dir, n); - err = PTR_ERR(page); - if (IS_ERR(page)) - goto out; - kaddr = (char*)page_address(page); + kaddr = dir_get_page(dir, n, &page); + if (IS_ERR(kaddr)) + return PTR_ERR(kaddr); de = (struct sysv_dir_entry *)kaddr; kaddr += PAGE_SIZE - SYSV_DIRSIZE; while ((char *)de <= kaddr) { @@ -225,7 +224,6 @@ got_it: err = sysv_handle_dirsync(dir); out_page: dir_put_page(page); -out: return err; out_unlock: unlock_page(page); @@ -295,12 +293,11 @@ int sysv_empty_dir(struct inode * inode) for (i = 0; i < npages; i++) { char *kaddr; struct sysv_dir_entry * de; - page = dir_get_page(inode, i); - if (IS_ERR(page)) + kaddr = dir_get_page(inode, i, &page); + if (IS_ERR(kaddr)) continue; - kaddr = (char *)page_address(page); de = (struct sysv_dir_entry *)kaddr; kaddr += PAGE_SIZE-SYSV_DIRSIZE; @@ -347,16 +344,14 @@ void sysv_set_link(struct sysv_dir_entry *de, struct page *page, sysv_handle_dirsync(inode); } -struct sysv_dir_entry * sysv_dotdot (struct inode *dir, struct page **p) +struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct page **p) { - struct page *page = dir_get_page(dir, 0); - struct sysv_dir_entry *de = NULL; + struct sysv_dir_entry *de = dir_get_page(dir, 0, p); - if (!IS_ERR(page)) { - de = (struct sysv_dir_entry*) page_address(page) + 1; - *p = page; - } - return de; + if (IS_ERR(de)) + return NULL; + /* ".." is the second directory entry */ + return de + 1; } ino_t sysv_inode_by_name(struct dentry *dentry)