From 2c6a2473b800f8eadc94c9a711fee8671dd1a244 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 22 May 2013 18:37:16 -0400 Subject: [PATCH] [readdir] convert fatfs ... pox upon the idiotic ioctls; life would be much easier without those. Signed-off-by: Al Viro --- fs/fat/dir.c | 104 ++++++++++++++++++++++++++------------------------- 1 file changed, 54 insertions(+), 50 deletions(-) diff --git a/fs/fat/dir.c b/fs/fat/dir.c index 7a6f02caf286..3963ede84eb0 100644 --- a/fs/fat/dir.c +++ b/fs/fat/dir.c @@ -543,6 +543,7 @@ end_of_dir: EXPORT_SYMBOL_GPL(fat_search_long); struct fat_ioctl_filldir_callback { + struct dir_context ctx; void __user *dirent; int result; /* for dir ioctl */ @@ -552,8 +553,9 @@ struct fat_ioctl_filldir_callback { int short_len; }; -static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, - filldir_t filldir, int short_only, int both) +static int __fat_readdir(struct inode *inode, struct file *file, + struct dir_context *ctx, int short_only, + struct fat_ioctl_filldir_callback *both) { struct super_block *sb = inode->i_sb; struct msdos_sb_info *sbi = MSDOS_SB(sb); @@ -564,27 +566,20 @@ static int __fat_readdir(struct inode *inode, struct file *filp, void *dirent, unsigned char bufname[FAT_MAX_SHORT_SIZE]; int isvfat = sbi->options.isvfat; const char *fill_name = NULL; - unsigned long inum; - unsigned long lpos, dummy, *furrfu = &lpos; + int fake_offset = 0; loff_t cpos; int short_len = 0, fill_len = 0; int ret = 0; mutex_lock(&sbi->s_lock); - cpos = filp->f_pos; + cpos = ctx->pos; /* Fake . and .. for the root directory. */ if (inode->i_ino == MSDOS_ROOT_INO) { - while (cpos < 2) { - if (filldir(dirent, "..", cpos+1, cpos, - MSDOS_ROOT_INO, DT_DIR) < 0) - goto out; - cpos++; - filp->f_pos++; - } - if (cpos == 2) { - dummy = 2; - furrfu = &dummy; + if (!dir_emit_dots(file, ctx)) + goto out; + if (ctx->pos == 2) { + fake_offset = 1; cpos = 0; } } @@ -619,7 +614,7 @@ parse_record: int status = fat_parse_long(inode, &cpos, &bh, &de, &unicode, &nr_slots); if (status < 0) { - filp->f_pos = cpos; + ctx->pos = cpos; ret = status; goto out; } else if (status == PARSE_INVALID) @@ -639,6 +634,19 @@ parse_record: /* !both && !short_only, so we don't need shortname. */ if (!both) goto start_filldir; + + short_len = fat_parse_short(sb, de, bufname, + sbi->options.dotsOK); + if (short_len == 0) + goto record_end; + /* hack for fat_ioctl_filldir() */ + both->longname = fill_name; + both->long_len = fill_len; + both->shortname = bufname; + both->short_len = short_len; + fill_name = NULL; + fill_len = 0; + goto start_filldir; } } @@ -646,28 +654,21 @@ parse_record: if (short_len == 0) goto record_end; - if (nr_slots) { - /* hack for fat_ioctl_filldir() */ - struct fat_ioctl_filldir_callback *p = dirent; - - p->longname = fill_name; - p->long_len = fill_len; - p->shortname = bufname; - p->short_len = short_len; - fill_name = NULL; - fill_len = 0; - } else { - fill_name = bufname; - fill_len = short_len; - } + fill_name = bufname; + fill_len = short_len; start_filldir: - lpos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); - if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) - inum = inode->i_ino; - else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { - inum = parent_ino(filp->f_path.dentry); + if (!fake_offset) + ctx->pos = cpos - (nr_slots + 1) * sizeof(struct msdos_dir_entry); + + if (!memcmp(de->name, MSDOS_DOT, MSDOS_NAME)) { + if (!dir_emit_dot(file, ctx)) + goto fill_failed; + } else if (!memcmp(de->name, MSDOS_DOTDOT, MSDOS_NAME)) { + if (!dir_emit_dotdot(file, ctx)) + goto fill_failed; } else { + unsigned long inum; loff_t i_pos = fat_make_i_pos(sb, bh, de); struct inode *tmp = fat_iget(sb, i_pos); if (tmp) { @@ -675,18 +676,17 @@ start_filldir: iput(tmp); } else inum = iunique(sb, MSDOS_ROOT_INO); + if (!dir_emit(ctx, fill_name, fill_len, inum, + (de->attr & ATTR_DIR) ? DT_DIR : DT_REG)) + goto fill_failed; } - if (filldir(dirent, fill_name, fill_len, *furrfu, inum, - (de->attr & ATTR_DIR) ? DT_DIR : DT_REG) < 0) - goto fill_failed; - record_end: - furrfu = &lpos; - filp->f_pos = cpos; + fake_offset = 0; + ctx->pos = cpos; goto get_new; end_of_dir: - filp->f_pos = cpos; + ctx->pos = cpos; fill_failed: brelse(bh); if (unicode) @@ -696,10 +696,9 @@ out: return ret; } -static int fat_readdir(struct file *filp, void *dirent, filldir_t filldir) +static int fat_readdir(struct file *file, struct dir_context *ctx) { - struct inode *inode = file_inode(filp); - return __fat_readdir(inode, filp, dirent, filldir, 0, 0); + return __fat_readdir(file_inode(file), file, ctx, 0, NULL); } #define FAT_IOCTL_FILLDIR_FUNC(func, dirent_type) \ @@ -755,20 +754,25 @@ efault: \ FAT_IOCTL_FILLDIR_FUNC(fat_ioctl_filldir, __fat_dirent) -static int fat_ioctl_readdir(struct inode *inode, struct file *filp, +static int fat_ioctl_readdir(struct inode *inode, struct file *file, void __user *dirent, filldir_t filldir, int short_only, int both) { - struct fat_ioctl_filldir_callback buf; + struct fat_ioctl_filldir_callback buf = { + .ctx.actor = filldir, + .dirent = dirent + }; int ret; buf.dirent = dirent; buf.result = 0; mutex_lock(&inode->i_mutex); + buf.ctx.pos = file->f_pos; ret = -ENOENT; if (!IS_DEADDIR(inode)) { - ret = __fat_readdir(inode, filp, &buf, filldir, - short_only, both); + ret = __fat_readdir(inode, file, &buf.ctx, + short_only, both ? &buf : NULL); + file->f_pos = buf.ctx.pos; } mutex_unlock(&inode->i_mutex); if (ret >= 0) @@ -854,7 +858,7 @@ static long fat_compat_dir_ioctl(struct file *filp, unsigned cmd, const struct file_operations fat_dir_operations = { .llseek = generic_file_llseek, .read = generic_read_dir, - .readdir = fat_readdir, + .iterate = fat_readdir, .unlocked_ioctl = fat_dir_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = fat_compat_dir_ioctl, -- 2.34.1