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Add support for btrfs subvolumes for user homes

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new switch added to useradd command, --btrfs-subvolume-home. When
specified *and* the filesystem is detected as btrfs, it will create a
subvolume for user's home instead of a plain directory. This is done via
`btrfs subvolume` command.  Specifying the new switch while trying to
create home on non-btrfs will result in an error.

userdel -r will handle and remove this subvolume transparently via
`btrfs subvolume` command. Previosuly this failed as you can't rmdir a
subvolume.

usermod, when moving user's home across devices, will detect if the home
is a subvolume and issue an error messages instead of copying it. Moving
user's home (as subvolume) on same btrfs works transparently.
This commit is contained in:
Adam Majer
2019-01-21 09:32:36 +01:00
committed by Serge Hallyn
parent caefe9e8de
commit c1d36a8acb
6 changed files with 158 additions and 2 deletions
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6
lib/prototypes.h
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@ -72,6 +72,12 @@ extern int expire (const struct passwd *, /*@null@*/const struct spwd *);
/* isexpired.c */
extern int isexpired (const struct passwd *, /*@null@*/const struct spwd *);
/* btrfs.c */
extern int btrfs_create_subvolume(const char *path);
extern int btrfs_remove_subvolume(const char *path);
extern int btrfs_is_subvolume(const char *path);
extern int is_btrfs(const char *path);
/* basename() renamed to Basename() to avoid libc name space confusion */
/* basename.c */
extern /*@observer@*/const char *Basename (const char *str);