diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-12-09 11:11:33 +0000 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-01-20 20:12:42 -0500 |
| commit | 08ead1b8b98d90795bf934d93a718328d11f6ce6 (patch) | |
| tree | 308a771820acfbf2d9fa6d6e7535045f9c5b3a32 /fs/adfs | |
| parent | e3858e125bd57b827af52dfb38df6c8602559886 (diff) | |
| download | lwn-08ead1b8b98d90795bf934d93a718328d11f6ce6.tar.gz lwn-08ead1b8b98d90795bf934d93a718328d11f6ce6.zip | |
fs/adfs: super: add support for E and E+ floppy image formats
Add support for ADFS E and E+ floppy image formats, which, unlike their
hard disk variants, do not have a filesystem boot block - they have a
single map zone, with the map fragment stored at sector 0.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/adfs')
| -rw-r--r-- | fs/adfs/super.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/fs/adfs/super.c b/fs/adfs/super.c index 4c06b2d5a861..a3cc8ecb50da 100644 --- a/fs/adfs/super.c +++ b/fs/adfs/super.c @@ -347,6 +347,20 @@ static int adfs_validate_bblk(struct super_block *sb, struct buffer_head *bh, return 0; } +static int adfs_validate_dr0(struct super_block *sb, struct buffer_head *bh, + struct adfs_discrecord **drp) +{ + struct adfs_discrecord *dr; + + /* Do some sanity checks on the ADFS disc record */ + dr = (struct adfs_discrecord *)(bh->b_data + 4); + if (adfs_checkdiscrecord(dr) || dr->nzones_high || dr->nzones != 1) + return -EILSEQ; + + *drp = dr; + return 0; +} + static int adfs_fill_super(struct super_block *sb, void *data, int silent) { struct adfs_discrecord *dr; @@ -376,7 +390,9 @@ static int adfs_fill_super(struct super_block *sb, void *data, int silent) goto error; /* Try to probe the filesystem boot block */ - ret = adfs_probe(sb, ADFS_DISCRECORD, silent, adfs_validate_bblk); + ret = adfs_probe(sb, ADFS_DISCRECORD, 1, adfs_validate_bblk); + if (ret == -EILSEQ) + ret = adfs_probe(sb, 0, silent, adfs_validate_dr0); if (ret == -EILSEQ) { if (!silent) adfs_msg(sb, KERN_ERR, |