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fat: fat_notify_change() and check_mode() cleanup

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- Rename fat_notify_change() to fat_setattr()
- check_mode() cleanup
- Change layout of code

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
OGAWA Hirofumi 2008-04-28 02:16:25 -07:00 committed by Linus Torvalds
parent 3754a54447
commit 1278fdd34b
4 changed files with 87 additions and 102 deletions
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183
fs/fat/file.c
View File

@ -157,104 +157,6 @@ out:
return err;
}
static int check_mode(const struct msdos_sb_info *sbi, mode_t mode)
{
mode_t req = mode & ~S_IFMT;
/*
* Of the r and x bits, all (subject to umask) must be present. Of the
* w bits, either all (subject to umask) or none must be present.
*/
if (S_ISREG(mode)) {
req &= ~sbi->options.fs_fmask;
if ((req & (S_IRUGO | S_IXUGO)) !=
((S_IRUGO | S_IXUGO) & ~sbi->options.fs_fmask))
return -EPERM;
if ((req & S_IWUGO) != 0 &&
(req & S_IWUGO) != (S_IWUGO & ~sbi->options.fs_fmask))
return -EPERM;
} else if (S_ISDIR(mode)) {
req &= ~sbi->options.fs_dmask;
if ((req & (S_IRUGO | S_IXUGO)) !=
((S_IRUGO | S_IXUGO) & ~sbi->options.fs_dmask))
return -EPERM;
if ((req & S_IWUGO) != 0 &&
(req & S_IWUGO) != (S_IWUGO & ~sbi->options.fs_dmask))
return -EPERM;
} else {
return -EPERM;
}
return 0;
}
int fat_notify_change(struct dentry *dentry, struct iattr *attr)
{
struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
struct inode *inode = dentry->d_inode;
int mask, error = 0;
lock_kernel();
/*
* Expand the file. Since inode_setattr() updates ->i_size
* before calling the ->truncate(), but FAT needs to fill the
* hole before it.
*/
if (attr->ia_valid & ATTR_SIZE) {
if (attr->ia_size > inode->i_size) {
error = fat_cont_expand(inode, attr->ia_size);
if (error || attr->ia_valid == ATTR_SIZE)
goto out;
attr->ia_valid &= ~ATTR_SIZE;
}
}
error = inode_change_ok(inode, attr);
if (error) {
if (sbi->options.quiet)
error = 0;
goto out;
}
if (((attr->ia_valid & ATTR_UID) &&
(attr->ia_uid != sbi->options.fs_uid)) ||
((attr->ia_valid & ATTR_GID) &&
(attr->ia_gid != sbi->options.fs_gid)))
error = -EPERM;
if (error) {
if (sbi->options.quiet)
error = 0;
goto out;
}
if (attr->ia_valid & ATTR_MODE) {
error = check_mode(sbi, attr->ia_mode);
if (error != 0 && !sbi->options.quiet)
goto out;
}
error = inode_setattr(inode, attr);
if (error)
goto out;
if (S_ISDIR(inode->i_mode))
mask = sbi->options.fs_dmask;
else
mask = sbi->options.fs_fmask;
inode->i_mode &= S_IFMT | (S_IRWXUGO & ~mask);
out:
unlock_kernel();
return error;
}
EXPORT_SYMBOL_GPL(fat_notify_change);
/* Free all clusters after the skip'th cluster. */
static int fat_free(struct inode *inode, int skip)
{
@ -355,8 +257,91 @@ int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
}
EXPORT_SYMBOL_GPL(fat_getattr);
static int fat_check_mode(const struct msdos_sb_info *sbi, mode_t mode)
{
mode_t mask, req = mode & ~S_IFMT;
if (S_ISREG(mode))
mask = sbi->options.fs_fmask;
else
mask = sbi->options.fs_dmask;
/*
* Of the r and x bits, all (subject to umask) must be present. Of the
* w bits, either all (subject to umask) or none must be present.
*/
req &= ~mask;
if ((req & (S_IRUGO | S_IXUGO)) != ((S_IRUGO | S_IXUGO) & ~mask))
return -EPERM;
if ((req & S_IWUGO) && ((req & S_IWUGO) != (S_IWUGO & ~mask)))
return -EPERM;
return 0;
}
int fat_setattr(struct dentry *dentry, struct iattr *attr)
{
struct msdos_sb_info *sbi = MSDOS_SB(dentry->d_sb);
struct inode *inode = dentry->d_inode;
int mask, error = 0;
lock_kernel();
/*
* Expand the file. Since inode_setattr() updates ->i_size
* before calling the ->truncate(), but FAT needs to fill the
* hole before it.
*/
if (attr->ia_valid & ATTR_SIZE) {
if (attr->ia_size > inode->i_size) {
error = fat_cont_expand(inode, attr->ia_size);
if (error || attr->ia_valid == ATTR_SIZE)
goto out;
attr->ia_valid &= ~ATTR_SIZE;
}
}
error = inode_change_ok(inode, attr);
if (error) {
if (sbi->options.quiet)
error = 0;
goto out;
}
if (((attr->ia_valid & ATTR_UID) &&
(attr->ia_uid != sbi->options.fs_uid)) ||
((attr->ia_valid & ATTR_GID) &&
(attr->ia_gid != sbi->options.fs_gid)))
error = -EPERM;
if (error) {
if (sbi->options.quiet)
error = 0;
goto out;
}
if (attr->ia_valid & ATTR_MODE) {
error = fat_check_mode(sbi, attr->ia_mode);
if (error != 0 && !sbi->options.quiet)
goto out;
}
error = inode_setattr(inode, attr);
if (error)
goto out;
if (S_ISDIR(inode->i_mode))
mask = sbi->options.fs_dmask;
else
mask = sbi->options.fs_fmask;
inode->i_mode &= S_IFMT | (S_IRWXUGO & ~mask);
out:
unlock_kernel();
return error;
}
EXPORT_SYMBOL_GPL(fat_setattr);
const struct inode_operations fat_file_inode_operations = {
.truncate = fat_truncate,
.setattr = fat_notify_change,
.setattr = fat_setattr,
.getattr = fat_getattr,
};

2
fs/msdos/namei.c
View File

@ -653,7 +653,7 @@ static const struct inode_operations msdos_dir_inode_operations = {
.mkdir = msdos_mkdir,
.rmdir = msdos_rmdir,
.rename = msdos_rename,
.setattr = fat_notify_change,
.setattr = fat_setattr,
.getattr = fat_getattr,
};

2
fs/vfat/namei.c
View File

@ -1003,7 +1003,7 @@ static const struct inode_operations vfat_dir_inode_operations = {
.mkdir = vfat_mkdir,
.rmdir = vfat_rmdir,
.rename = vfat_rename,
.setattr = fat_notify_change,
.setattr = fat_setattr,
.getattr = fat_getattr,
};

2
include/linux/msdos_fs.h
View File

@ -401,7 +401,7 @@ extern int fat_generic_ioctl(struct inode *inode, struct file *filp,
unsigned int cmd, unsigned long arg);
extern const struct file_operations fat_file_operations;
extern const struct inode_operations fat_file_inode_operations;
extern int fat_notify_change(struct dentry * dentry, struct iattr * attr);
extern int fat_setattr(struct dentry * dentry, struct iattr * attr);
extern void fat_truncate(struct inode *inode);
extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat);