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Set UFS/FFS file type to snapshot before changing its block pointers.
A UFS/FFS snapshot file is identified with the SF_SNAPSHOT flag to identify it as a snapshot. This flag needs to be set before setting some of its block pointers to the special values BLK_SNAP and BLK_NOCOPY. If the snapshot creation fails and we call VOP_REMOVE(), the SF_SNAPSHOT flag will let the remove routine know that the special block pointer values need to be rolled back before attempting deletion of the file. Also ensure that an fsck is required after setting superblock values in the ffs_checkcgintegrity() routine. Reported-by: Peter Holm Tested-by: Peter Holm MFC-after: 1 week Sponsored-by: The FreeBSD Foundation
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@ -3130,6 +3130,7 @@ ffs_checkcgintegrity(struct fs *fs,
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fs->fs_cstotal.cs_nifree -= fs->fs_cs(fs, cg).cs_nifree;
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fs->fs_cs(fs, cg).cs_nifree = 0;
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fs->fs_maxcluster[cg] = 0;
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fs->fs_flags |= FS_NEEDSFSCK;
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fs->fs_fmod = 1;
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}
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@ -368,6 +368,15 @@ ffs_snapshot(struct mount *mp, char *snapfile)
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goto out;
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}
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}
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/*
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* Change inode to snapshot type file. Before setting its block
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* pointers to BLK_SNAP and BLK_NOCOPY in cgaccount, we have to
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* set its type to SF_SNAPSHOT so that VOP_REMOVE will know that
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* they need to be rolled back before attempting deletion.
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*/
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ip->i_flags |= SF_SNAPSHOT;
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DIP_SET(ip, i_flags, ip->i_flags);
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UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
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/*
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* Copy all the cylinder group maps. Although the
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* filesystem is still active, we hope that only a few
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@ -393,12 +402,6 @@ ffs_snapshot(struct mount *mp, char *snapfile)
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if (error)
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goto out;
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}
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/*
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* Change inode to snapshot type file.
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*/
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ip->i_flags |= SF_SNAPSHOT;
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DIP_SET(ip, i_flags, ip->i_flags);
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UFS_INODE_SET_FLAG(ip, IN_CHANGE | IN_UPDATE);
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/*
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* Ensure that the snapshot is completely on disk.
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* Since we have marked it as a snapshot it is safe to
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