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[readdir] simple local unixlike: switch to ->iterate() 

ext2, ufs, minix, sysv

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-05-15 18:51:49 -04:00
parent bb6f619b3a
commit 80886298c0
4 changed files with 59 additions and 75 deletions
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27
fs/ext2/dir.c
View File

@ -287,17 +287,17 @@ static inline void ext2_set_de_type(ext2_dirent *de, struct inode *inode)
}
static int
ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)
ext2_readdir(struct file *file, struct dir_context *ctx)
{
loff_t pos = filp->f_pos;
struct inode *inode = file_inode(filp);
loff_t pos = ctx->pos;
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
unsigned int offset = pos & ~PAGE_CACHE_MASK;
unsigned long n = pos >> PAGE_CACHE_SHIFT;
unsigned long npages = dir_pages(inode);
unsigned chunk_mask = ~(ext2_chunk_size(inode)-1);
unsigned char *types = NULL;
int need_revalidate = filp->f_version != inode->i_version;
int need_revalidate = file->f_version != inode->i_version;
if (pos > inode->i_size - EXT2_DIR_REC_LEN(1))
return 0;
@ -314,16 +314,16 @@ ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)
ext2_error(sb, __func__,
"bad page in #%lu",
inode->i_ino);
filp->f_pos += PAGE_CACHE_SIZE - offset;
ctx->pos += PAGE_CACHE_SIZE - offset;
return PTR_ERR(page);
}
kaddr = page_address(page);
if (unlikely(need_revalidate)) {
if (offset) {
offset = ext2_validate_entry(kaddr, offset, chunk_mask);
filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
ctx->pos = (n<<PAGE_CACHE_SHIFT) + offset;
}
filp->f_version = inode->i_version;
file->f_version = inode->i_version;
need_revalidate = 0;
}
de = (ext2_dirent *)(kaddr+offset);
@ -336,22 +336,19 @@ ext2_readdir (struct file * filp, void * dirent, filldir_t filldir)
return -EIO;
}
if (de->inode) {
int over;
unsigned char d_type = DT_UNKNOWN;
if (types && de->file_type < EXT2_FT_MAX)
d_type = types[de->file_type];
offset = (char *)de - kaddr;
over = filldir(dirent, de->name, de->name_len,
(n<<PAGE_CACHE_SHIFT) | offset,
le32_to_cpu(de->inode), d_type);
if (over) {
if (!dir_emit(ctx, de->name, de->name_len,
le32_to_cpu(de->inode),
d_type)) {
ext2_put_page(page);
return 0;
}
}
filp->f_pos += ext2_rec_len_from_disk(de->rec_len);
ctx->pos += ext2_rec_len_from_disk(de->rec_len);
}
ext2_put_page(page);
}
@ -724,7 +721,7 @@ not_empty:
const struct file_operations ext2_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = ext2_readdir,
.iterate = ext2_readdir,
.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = ext2_compat_ioctl,

42
fs/minix/dir.c
View File

@ -16,12 +16,12 @@
typedef struct minix_dir_entry minix_dirent;
typedef struct minix3_dir_entry minix3_dirent;
static int minix_readdir(struct file *, void *, filldir_t);
static int minix_readdir(struct file *, struct dir_context *);
const struct file_operations minix_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = minix_readdir,
.iterate = minix_readdir,
.fsync = generic_file_fsync,
};
@ -82,22 +82,23 @@ static inline void *minix_next_entry(void *de, struct minix_sb_info *sbi)
return (void*)((char*)de + sbi->s_dirsize);
}
static int minix_readdir(struct file * filp, void * dirent, filldir_t filldir)
static int minix_readdir(struct file *file, struct dir_context *ctx)
{
unsigned long pos = filp->f_pos;
struct inode *inode = file_inode(filp);
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
unsigned offset = pos & ~PAGE_CACHE_MASK;
unsigned long n = pos >> PAGE_CACHE_SHIFT;
unsigned long npages = dir_pages(inode);
struct minix_sb_info *sbi = minix_sb(sb);
unsigned chunk_size = sbi->s_dirsize;
char *name;
__u32 inumber;
unsigned long npages = dir_pages(inode);
unsigned long pos = ctx->pos;
unsigned offset;
unsigned long n;
pos = (pos + chunk_size-1) & ~(chunk_size-1);
ctx->pos = pos = (pos + chunk_size-1) & ~(chunk_size-1);
if (pos >= inode->i_size)
goto done;
return 0;
offset = pos & ~PAGE_CACHE_MASK;
n = pos >> PAGE_CACHE_SHIFT;
for ( ; n < npages; n++, offset = 0) {
char *p, *kaddr, *limit;
@ -109,6 +110,8 @@ static int minix_readdir(struct file * filp, void * dirent, filldir_t filldir)
p = kaddr+offset;
limit = kaddr + minix_last_byte(inode, n) - chunk_size;
for ( ; p <= limit; p = minix_next_entry(p, sbi)) {
const char *name;
__u32 inumber;
if (sbi->s_version == MINIX_V3) {
minix3_dirent *de3 = (minix3_dirent *)p;
name = de3->name;
@ -119,24 +122,17 @@ static int minix_readdir(struct file * filp, void * dirent, filldir_t filldir)
inumber = de->inode;
}
if (inumber) {
int over;
unsigned l = strnlen(name, sbi->s_namelen);
offset = p - kaddr;
over = filldir(dirent, name, l,
(n << PAGE_CACHE_SHIFT) | offset,
inumber, DT_UNKNOWN);
if (over) {
if (!dir_emit(ctx, name, l,
inumber, DT_UNKNOWN)) {
dir_put_page(page);
goto done;
return 0;
}
}
ctx->pos += chunk_size;
}
dir_put_page(page);
}
done:
filp->f_pos = (n << PAGE_CACHE_SHIFT) | offset;
return 0;
}

37
fs/sysv/dir.c
View File

@ -18,12 +18,12 @@
#include <linux/swap.h>
#include "sysv.h"
static int sysv_readdir(struct file *, void *, filldir_t);
static int sysv_readdir(struct file *, struct dir_context *);
const struct file_operations sysv_dir_operations = {
.llseek = generic_file_llseek,
.read = generic_read_dir,
.readdir = sysv_readdir,
.iterate = sysv_readdir,
.fsync = generic_file_fsync,
};
@ -65,18 +65,21 @@ static struct page * dir_get_page(struct inode *dir, unsigned long n)
return page;
}
static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir)
static int sysv_readdir(struct file *file, struct dir_context *ctx)
{
unsigned long pos = filp->f_pos;
struct inode *inode = file_inode(filp);
unsigned long pos = ctx->pos;
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
unsigned offset = pos & ~PAGE_CACHE_MASK;
unsigned long n = pos >> PAGE_CACHE_SHIFT;
unsigned long npages = dir_pages(inode);
unsigned offset;
unsigned long n;
pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
ctx->pos = pos = (pos + SYSV_DIRSIZE-1) & ~(SYSV_DIRSIZE-1);
if (pos >= inode->i_size)
goto done;
return 0;
offset = pos & ~PAGE_CACHE_MASK;
n = pos >> PAGE_CACHE_SHIFT;
for ( ; n < npages; n++, offset = 0) {
char *kaddr, *limit;
@ -88,29 +91,21 @@ static int sysv_readdir(struct file * filp, void * dirent, filldir_t filldir)
kaddr = (char *)page_address(page);
de = (struct sysv_dir_entry *)(kaddr+offset);
limit = kaddr + PAGE_CACHE_SIZE - SYSV_DIRSIZE;
for ( ;(char*)de <= limit; de++) {
for ( ;(char*)de <= limit; de++, ctx->pos += sizeof(*de)) {
char *name = de->name;
int over;
if (!de->inode)
continue;
offset = (char *)de - kaddr;
over = filldir(dirent, name, strnlen(name,SYSV_NAMELEN),
((loff_t)n<<PAGE_CACHE_SHIFT) | offset,
if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
fs16_to_cpu(SYSV_SB(sb), de->inode),
DT_UNKNOWN);
if (over) {
DT_UNKNOWN)) {
dir_put_page(page);
goto done;
return 0;
}
}
dir_put_page(page);
}
done:
filp->f_pos = ((loff_t)n << PAGE_CACHE_SHIFT) | offset;
return 0;
}

28
fs/ufs/dir.c
View File

@ -430,16 +430,16 @@ ufs_validate_entry(struct super_block *sb, char *base,
* This is blatantly stolen from ext2fs
*/
static int
ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
ufs_readdir(struct file *file, struct dir_context *ctx)
{
loff_t pos = filp->f_pos;
struct inode *inode = file_inode(filp);
loff_t pos = ctx->pos;
struct inode *inode = file_inode(file);
struct super_block *sb = inode->i_sb;
unsigned int offset = pos & ~PAGE_CACHE_MASK;
unsigned long n = pos >> PAGE_CACHE_SHIFT;
unsigned long npages = ufs_dir_pages(inode);
unsigned chunk_mask = ~(UFS_SB(sb)->s_uspi->s_dirblksize - 1);
int need_revalidate = filp->f_version != inode->i_version;
int need_revalidate = file->f_version != inode->i_version;
unsigned flags = UFS_SB(sb)->s_flags;
UFSD("BEGIN\n");
@ -457,16 +457,16 @@ ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
ufs_error(sb, __func__,
"bad page in #%lu",
inode->i_ino);
filp->f_pos += PAGE_CACHE_SIZE - offset;
ctx->pos += PAGE_CACHE_SIZE - offset;
return -EIO;
}
kaddr = page_address(page);
if (unlikely(need_revalidate)) {
if (offset) {
offset = ufs_validate_entry(sb, kaddr, offset, chunk_mask);
filp->f_pos = (n<<PAGE_CACHE_SHIFT) + offset;
ctx->pos = (n<<PAGE_CACHE_SHIFT) + offset;
}
filp->f_version = inode->i_version;
file->f_version = inode->i_version;
need_revalidate = 0;
}
de = (struct ufs_dir_entry *)(kaddr+offset);
@ -479,11 +479,8 @@ ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
return -EIO;
}
if (de->d_ino) {
int over;
unsigned char d_type = DT_UNKNOWN;
offset = (char *)de - kaddr;
UFSD("filldir(%s,%u)\n", de->d_name,
fs32_to_cpu(sb, de->d_ino));
UFSD("namlen %u\n", ufs_get_de_namlen(sb, de));
@ -491,16 +488,15 @@ ufs_readdir(struct file *filp, void *dirent, filldir_t filldir)
if ((flags & UFS_DE_MASK) == UFS_DE_44BSD)
d_type = de->d_u.d_44.d_type;
over = filldir(dirent, de->d_name,
if (!dir_emit(ctx, de->d_name,
ufs_get_de_namlen(sb, de),
(n<<PAGE_CACHE_SHIFT) | offset,
fs32_to_cpu(sb, de->d_ino), d_type);
if (over) {
fs32_to_cpu(sb, de->d_ino),
d_type)) {
ufs_put_page(page);
return 0;
}
}
filp->f_pos += fs16_to_cpu(sb, de->d_reclen);
ctx->pos += fs16_to_cpu(sb, de->d_reclen);
}
ufs_put_page(page);
}
@ -660,7 +656,7 @@ not_empty:
const struct file_operations ufs_dir_operations = {
.read = generic_read_dir,
.readdir = ufs_readdir,
.iterate = ufs_readdir,
.fsync = generic_file_fsync,
.llseek = generic_file_llseek,
};