[PATCH 14/21] fat: Cleanup FAT attribute stuff

OGAWA Hirofumi
2008-10-15T14:09:41Z

This adds three helpers:

fat_make_attrs() - makes FAT attributes from inode.
fat_make_mode() - makes mode_t from FAT attributes.
fat_save_attrs() - saves FAT attributes to inode.

Then this replaces: MSDOS_MKMODE() by fat_make_mode(), fat_attr() by
fat_make_attrs(), ->i_attrs = attr & ATTR_UNUSED by fat_save_attrs().
And for root inode, those is used with ATTR_DIR instead of bogus
ATTR_NONE.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
---

fs/fat/fat.h | 20 +++++++++++++++++++-
fs/fat/file.c | 32 ++++++++++++--------------------
fs/fat/inode.c | 19 +++++++++----------
include/linux/msdos_fs.h | 5 -----
4 files changed, 40 insertions(+), 36 deletions(-)

diff -puN fs/fat/file.c~fat-attrs-cleanup fs/fat/file.c
--- linux-2.6/fs/fat/file.c~fat-attrs-cleanup 2008-08-27 19:33:26.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/file.c 2008-08-27 22:24:41.000000000 +0900
@@ -27,13 +27,7 @@ int fat_generic_ioctl(struct inode *inod
switch (cmd) {
case FAT_IOCTL_GET_ATTRIBUTES:
{
- u32 attr;
-
- if (inode->i_ino == MSDOS_ROOT_INO)
- attr = ATTR_DIR;
- else
- attr = fat_attr(inode);
-
+ u32 attr = fat_make_attrs(inode);
return put_user(attr, user_attr);
}
case FAT_IOCTL_SET_ATTRIBUTES:
@@ -62,20 +56,16 @@ int fat_generic_ioctl(struct inode *inod
/* Merge in ATTR_VOLUME and ATTR_DIR */
attr |= (MSDOS_I(inode)->i_attrs & ATTR_VOLUME) |
(is_dir ? ATTR_DIR : 0);
- oldattr = fat_attr(inode);
+ oldattr = fat_make_attrs(inode);

/* Equivalent to a chmod() */
ia.ia_valid = ATTR_MODE | ATTR_CTIME;
ia.ia_ctime = current_fs_time(inode->i_sb);
- if (is_dir) {
- ia.ia_mode = MSDOS_MKMODE(attr,
- S_IRWXUGO & ~sbi->options.fs_dmask)
- | S_IFDIR;
- } else {
- ia.ia_mode = MSDOS_MKMODE(attr,
- (S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO))
- & ~sbi->options.fs_fmask)
- | S_IFREG;
+ if (is_dir)
+ ia.ia_mode = fat_make_mode(sbi, attr, S_IRWXUGO);
+ else {
+ ia.ia_mode = fat_make_mode(sbi, attr,
+ S_IRUGO | S_IWUGO | (inode->i_mode & S_IXUGO));
}

/* The root directory has no attributes */
@@ -115,7 +105,7 @@ int fat_generic_ioctl(struct inode *inod
inode->i_flags &= S_IMMUTABLE;
}

- MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
+ fat_save_attrs(inode, attr);
mark_inode_dirty(inode);
up:
mnt_drop_write(filp->f_path.mnt);
@@ -274,7 +264,7 @@ static int fat_sanitize_mode(const struc

/*
* Note, the basic check is already done by a caller of
- * (attr->ia_mode & ~MSDOS_VALID_MODE)
+ * (attr->ia_mode & ~FAT_VALID_MODE)
*/

if (S_ISREG(inode->i_mode))
@@ -314,6 +304,8 @@ static int fat_allow_set_time(struct msd
}

#define TIMES_SET_FLAGS (ATTR_MTIME_SET | ATTR_ATIME_SET | ATTR_TIMES_SET)
+/* valid file mode bits */
+#define FAT_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXUGO)

int fat_setattr(struct dentry *dentry, struct iattr *attr)
{
@@ -356,7 +348,7 @@ int fat_setattr(struct dentry *dentry, s
((attr->ia_valid & ATTR_GID) &&
(attr->ia_gid != sbi->options.fs_gid)) ||
((attr->ia_valid & ATTR_MODE) &&
- (attr->ia_mode & ~MSDOS_VALID_MODE)))
+ (attr->ia_mode & ~FAT_VALID_MODE)))
error = -EPERM;

if (error) {
diff -puN fs/fat/fat.h~fat-attrs-cleanup fs/fat/fat.h
--- linux-2.6/fs/fat/fat.h~fat-attrs-cleanup 2008-08-27 19:33:26.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/fat.h 2008-08-27 22:24:41.000000000 +0900
@@ -117,14 +117,32 @@ static inline struct msdos_inode_info *M
return container_of(inode, struct msdos_inode_info, vfs_inode);
}

+/* Convert attribute bits and a mask to the UNIX mode. */
+static inline mode_t fat_make_mode(struct msdos_sb_info *sbi,
+ u8 attrs, mode_t mode)
+{
+ if (attrs & ATTR_RO)
+ mode &= ~S_IWUGO;
+
+ if (attrs & ATTR_DIR)
+ return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
+ else
+ return (mode & ~sbi->options.fs_fmask) | S_IFREG;
+}
+
/* Return the FAT attribute byte for this inode */
-static inline u8 fat_attr(struct inode *inode)
+static inline u8 fat_make_attrs(struct inode *inode)
{
return ((inode->i_mode & S_IWUGO) ? ATTR_NONE : ATTR_RO) |
(S_ISDIR(inode->i_mode) ? ATTR_DIR : ATTR_NONE) |
MSDOS_I(inode)->i_attrs;
}

+static inline void fat_save_attrs(struct inode *inode, u8 attrs)
+{
+ MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED;
+}
+
static inline unsigned char fat_checksum(const __u8 *name)
{
unsigned char s = name[0];
diff -puN fs/fat/inode.c~fat-attrs-cleanup fs/fat/inode.c
--- linux-2.6/fs/fat/inode.c~fat-attrs-cleanup 2008-08-27 19:33:26.000000000 +0900
+++ linux-2.6-hirofumi/fs/fat/inode.c 2008-08-27 22:24:41.000000000 +0900
@@ -337,8 +337,7 @@ static int fat_fill_inode(struct inode *

if ((de->attr & ATTR_DIR) && !IS_FREE(de->name)) {
inode->i_generation &= ~1;
- inode->i_mode = MSDOS_MKMODE(de->attr,
- S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
+ inode->i_mode = fat_make_mode(sbi, de->attr, S_IRWXUGO);
inode->i_op = sbi->dir_ops;
inode->i_fop = &fat_dir_operations;

@@ -355,10 +354,9 @@ static int fat_fill_inode(struct inode *
inode->i_nlink = fat_subdirs(inode);
} else { /* not a directory */
inode->i_generation |= 1;
- inode->i_mode = MSDOS_MKMODE(de->attr,
- ((sbi->options.showexec && !is_exec(de->name + 8))
- ? S_IRUGO|S_IWUGO : S_IRWXUGO)
- & ~sbi->options.fs_fmask) | S_IFREG;
+ inode->i_mode = fat_make_mode(sbi, de->attr,
+ ((sbi->options.showexec && !is_exec(de->name + 8))
+ ? S_IRUGO|S_IWUGO : S_IRWXUGO));
MSDOS_I(inode)->i_start = le16_to_cpu(de->start);
if (sbi->fat_bits == 32)
MSDOS_I(inode)->i_start |= (le16_to_cpu(de->starthi) << 16);
@@ -374,7 +372,8 @@ static int fat_fill_inode(struct inode *
if (sbi->options.sys_immutable)
inode->i_flags |= S_IMMUTABLE;
}
- MSDOS_I(inode)->i_attrs = de->attr & ATTR_UNUSED;
+ fat_save_attrs(inode, de->attr);
+
inode->i_blocks = ((inode->i_size + (sbi->cluster_size - 1))
& ~((loff_t)sbi->cluster_size - 1)) >> 9;

@@ -569,7 +568,7 @@ retry:
raw_entry->size = 0;
else
raw_entry->size = cpu_to_le32(inode->i_size);
- raw_entry->attr = fat_attr(inode);
+ raw_entry->attr = fat_make_attrs(inode);
raw_entry->start = cpu_to_le16(MSDOS_I(inode)->i_logstart);
raw_entry->starthi = cpu_to_le16(MSDOS_I(inode)->i_logstart >> 16);
fat_time_unix2fat(sbi, &inode->i_mtime, &raw_entry->time,
@@ -1121,7 +1120,7 @@ static int fat_read_root(struct inode *i
inode->i_gid = sbi->options.fs_gid;
inode->i_version++;
inode->i_generation = 0;
- inode->i_mode = (S_IRWXUGO & ~sbi->options.fs_dmask) | S_IFDIR;
+ inode->i_mode = fat_make_mode(sbi, ATTR_DIR, S_IRWXUGO);
inode->i_op = sbi->dir_ops;
inode->i_fop = &fat_dir_operations;
if (sbi->fat_bits == 32) {
@@ -1138,7 +1137,7 @@ static int fat_read_root(struct inode *i
MSDOS_I(inode)->i_logstart = 0;
MSDOS_I(inode)->mmu_private = inode->i_size;

- MSDOS_I(inode)->i_attrs = ATTR_NONE;
+ fat_save_attrs(inode, ATTR_DIR);
inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec = 0;
inode->i_mtime.tv_nsec = inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = 0;
inode->i_nlink = fat_subdirs(inode)+2;
diff -puN include/linux/msdos_fs.h~fat-attrs-cleanup include/linux/msdos_fs.h
--- linux-2.6/include/linux/msdos_fs.h~fat-attrs-cleanup 2008-08-27 19:33:26.000000000 +0900
+++ linux-2.6-hirofumi/include/linux/msdos_fs.h 2008-08-27 22:24:40.000000000 +0900
@@ -46,11 +46,6 @@
#define DELETED_FLAG 0xe5 /* marks file as deleted when in name[0] */
#define IS_FREE(n) (!*(n) || *(n) == DELETED_FLAG)

-/* valid file mode bits */
-#define MSDOS_VALID_MODE (S_IFREG | S_IFDIR | S_IRWXU | S_IRWXG | S_IRWXO)
-/* Convert attribute bits and a mask to the UNIX mode. */
-#define MSDOS_MKMODE(a, m) (m & (a & ATTR_RO ? S_IRUGO|S_IXUGO : S_IRWXUGO))
-
#define MSDOS_NAME 11 /* maximum name length */
#define MSDOS_LONGNAME 256 /* maximum name length */
#define MSDOS_SLOTS 21 /* max # of slots for short and long names */
_