unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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fs/adfs: newdir: split out directory commit from update

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After changing a directory, we need to update the sequence numbers and
calculate the new check byte before the directory is scheduled to be
written back to the media.  Since this needs to happen for any change
to the directory, move this into a separate method.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Russell King 2019-12-09 11:10:47 +00:00 committed by Al Viro
parent cc625ccd0e
commit aacc954c1b
3 changed files with 18 additions and 13 deletions
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1
fs/adfs/adfs.h
View file

@ -130,6 +130,7 @@ struct adfs_dir_ops {
int (*update)(struct adfs_dir *dir, struct object_info *obj);
int (*create)(struct adfs_dir *dir, struct object_info *obj);
int (*remove)(struct adfs_dir *dir, struct object_info *obj);
int (*commit)(struct adfs_dir *dir);
};
struct adfs_discmap {

4
fs/adfs/dir.c
View file

@ -293,6 +293,10 @@ adfs_dir_update(struct super_block *sb, struct object_info *obj, int wait)
goto unlock;
ret = ops->update(&dir, obj);
if (ret)
goto forget;
ret = ops->commit(&dir);
if (ret)
goto forget;
up_write(&adfs_dir_rwsem);

26
fs/adfs/dir_f.c
View file

@ -292,25 +292,24 @@ static int adfs_f_update(struct adfs_dir *dir, struct object_info *obj)
adfs_obj2dir(&de, obj);
/* Write the directory entry back to the directory */
ret = adfs_dir_copyto(dir, pos, &de, 26);
if (ret)
return ret;
/*
* Increment directory sequence number
*/
return adfs_dir_copyto(dir, offset, &de, 26);
}
static int adfs_f_commit(struct adfs_dir *dir)
{
int ret;
/* Increment directory sequence number */
dir->dirhead->startmasseq += 1;
dir->newtail->endmasseq += 1;
ret = adfs_dir_checkbyte(dir);
/*
* Update directory check byte
*/
dir->newtail->dircheckbyte = ret;
/* Update directory check byte */
dir->newtail->dircheckbyte = adfs_dir_checkbyte(dir);
/* Make sure the directory still validates correctly */
ret = adfs_f_validate(dir);
if (ret)
adfs_error(dir->sb, "whoops! I broke a directory!");
adfs_msg(dir->sb, KERN_ERR, "error: update broke directory");
return ret;
}
@ -321,4 +320,5 @@ const struct adfs_dir_ops adfs_f_dir_ops = {
.setpos = adfs_f_setpos,
.getnext = adfs_f_getnext,
.update = adfs_f_update,
.commit = adfs_f_commit,
};