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2023-01-19fs: port ->fileattr_set() to pass mnt_idmapChristian Brauner1-1/+1
Convert to struct mnt_idmap. Last cycle we merged the necessary infrastructure in 256c8aed2b42 ("fs: introduce dedicated idmap type for mounts"). This is just the conversion to struct mnt_idmap. Currently we still pass around the plain namespace that was attached to a mount. This is in general pretty convenient but it makes it easy to conflate namespaces that are relevant on the filesystem with namespaces that are relevent on the mount level. Especially for non-vfs developers without detailed knowledge in this area this can be a potential source for bugs. Once the conversion to struct mnt_idmap is done all helpers down to the really low-level helpers will take a struct mnt_idmap argument instead of two namespace arguments. This way it becomes impossible to conflate the two eliminating the possibility of any bugs. All of the vfs and all filesystems only operate on struct mnt_idmap. Acked-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
2022-12-05btrfs: move ioctl prototypes into ioctl.hJosef Bacik1-0/+17
Move these out of ctree.h into ioctl.h to cut down on code in ctree.h. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
2013-02-20Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.hFilipe Brandenburger1-502/+0
The header file will then be installed under /usr/include/linux so that userspace applications can refer to Btrfs ioctls by name and use the same structs used internally in the kernel. Signed-off-by: Filipe Brandenburger <filbranden@google.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-12-17Btrfs: add support for device replace ioctlsStefan Behrens1-3/+4
This is the commit that allows to start the device replace procedure. An ioctl() interface is added that supports starting and canceling the device replace procedure, and to retrieve the status and progress. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-12-13Btrfs: add new sources for device replace codeStefan Behrens1-0/+45
This adds a new file to the sources together with the header file and the changes to ioctl.h and ctree.h that are required by the new C source file. Additionally, 4 new functions are added to volume.c that deal with device creation and destruction. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-07-26Merge branch 'send-v2' of git://github.com/ablock84/linux-btrfs into for-linusChris Mason1-0/+26
This is the kernel portion of btrfs send/receive Conflicts: fs/btrfs/Makefile fs/btrfs/backref.h fs/btrfs/ctree.c fs/btrfs/ioctl.c fs/btrfs/ioctl.h Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-07-26Btrfs: introduce BTRFS_IOC_SEND for btrfs send/receiveAlexander Block1-0/+10
This patch introduces the BTRFS_IOC_SEND ioctl that is required for send. It allows btrfs-progs to implement full and incremental sends. Patches for btrfs-progs will follow. Signed-off-by: Alexander Block <ablock84@googlemail.com> Reviewed-by: David Sterba <dave@jikos.cz> Reviewed-by: Arne Jansen <sensille@gmx.net> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Reviewed-by: Alex Lyakas <alex.bolshoy.btrfs@gmail.com>
2012-07-26Btrfs: introduce subvol uuids and timesAlexander Block1-0/+17
This patch introduces uuids for subvolumes. Each subvolume has it's own uuid. In case it was snapshotted, it also contains parent_uuid. In case it was received, it also contains received_uuid. It also introduces subvolume ctime/otime/stime/rtime. The first two are comparable to the times found in inodes. otime is the origin/creation time and ctime is the change time. stime/rtime are only valid on received subvolumes. stime is the time of the subvolume when it was sent. rtime is the time of the subvolume when it was received. Additionally to the times, we have a transid for each time. They are updated at the same place as the times. btrfs receive uses stransid and rtransid to find out if a received subvolume changed in the meantime. If an older kernel mounts a filesystem with the extented fields, all fields become invalid. The next mount with a new kernel will detect this and reset the fields. Signed-off-by: Alexander Block <ablock84@googlemail.com> Reviewed-by: David Sterba <dave@jikos.cz> Reviewed-by: Arne Jansen <sensille@gmx.net> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Reviewed-by: Alex Lyakas <alex.bolshoy.btrfs@gmail.com>
2012-07-26Merge branch 'qgroup' of git://git.jan-o-sch.net/btrfs-unstable into for-linusChris Mason1-1/+61
Conflicts: fs/btrfs/ioctl.c fs/btrfs/ioctl.h fs/btrfs/transaction.c fs/btrfs/transaction.h Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2012-07-24Btrfs: add DEVICE_READY ioctlJosef Bacik1-1/+2
This will be used in conjunction with btrfs device ready <dev>. This is needed for initrd's to have a nice and lightweight way to tell if all of the devices needed for a file system are in the cache currently. This keeps them from having to do mount+sleep loops waiting for devices to show up. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2012-07-23btrfs: join DEV_STATS ioctls to oneDavid Sterba1-2/+4
Commit c11d2c236cc260b36 (Btrfs: add ioctl to get and reset the device stats) introduced two ioctls doing almost the same thing distinguished by just the ioctl number which encodes "do reset after read". I have suggested http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg16604.html to implement it via the ioctl args. This hasn't happen, and I think we should use a more clean way to pass flags and should not waste ioctl numbers. CC: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: David Sterba <dsterba@suse.cz>
2012-07-12Btrfs: add qgroup inheritanceArne Jansen1-1/+10
When creating a subvolume or snapshot, it is necessary to initialize the qgroup account with a copy of some other (tracking) qgroup. This patch adds parameters to the ioctls to pass the information from which qgroup to inherit. Signed-off-by: Arne Jansen <sensille@gmx.net>
2012-07-12Btrfs: add qgroup ioctlsArne Jansen1-0/+27
Ioctls to control the qgroup feature like adding and removing qgroups and assigning qgroups. Signed-off-by: Arne Jansen <sensille@gmx.net>
2012-07-12Btrfs: qgroup implementation and prototypesArne Jansen1-0/+24
Signed-off-by: Arne Jansen <sensille@gmx.net> Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-07-02Btrfs: use _IOR for BTRFS_IOC_SUBVOL_GETFLAGSAlexander Block1-1/+1
We used the wrong ioctl macro for the getflags ioctl before. As we don't have the set/getflags ioctls in the user space ioctl.h at the moment, it's safe to fix it now. Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Alexander Block <ablock84@googlemail.com>
2012-05-30Btrfs: add ioctl to get and reset the device statsStefan Behrens1-0/+14
An ioctl interface is added to get the device statistic counters. A second ioctl is added to atomically get and reset these counters. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
2012-05-30Btrfs: add device counters for detected IO and checksum errorsStefan Behrens1-0/+19
The goal is to detect when drives start to get an increased error rate, when drives should be replaced soon. Therefore statistic counters are added that count IO errors (read, write and flush). Additionally, the software detected errors like checksum errors and corrupted blocks are counted. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
2012-05-04btrfs: Fix mismatching struct members in ioctl.hAlexander Block1-2/+2
Fix the size members of btrfs_ioctl_ino_path_args and btrfs_ioctl_logical_ino_args. The user space btrfs-progs utilities used __u64 and the kernel headers used __u32 before. Signed-off-by: Alexander Block <ablock84@googlemail.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2012-01-17Btrfs: add balance progress reportingIlya Dryomov1-0/+2
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-17Btrfs: allow for canceling restriperIlya Dryomov1-0/+2
Implement an ioctl for canceling restriper. Currently we wait until relocation of the current block group is finished, in future this can be done by triggering a commit. Balance item is deleted and no memory about the interrupted balance is kept. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-17Btrfs: allow for pausing restriperIlya Dryomov1-0/+7
Implement an ioctl for pausing restriper. This pauses the relocation, but balance is still considered to be "in progress": balance item is not deleted, other volume operations cannot be started, etc. If paused in the middle of profile changing operation we will continue making allocations with the target profile. Add a hook to close_ctree() to pause restriper and free its data structures on unmount. (It's safe to unmount when restriper is in "paused" state, we will resume with the same parameters on the next mount) Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2012-01-17Btrfs: add basic restriper infrastructureIlya Dryomov1-0/+43
Add basic restriper infrastructure: extended balancing ioctl and all related ioctl data structures, add data structure for tracking restriper's state to fs_info, etc. The semantics of the old balancing ioctl are fully preserved. Explicitly disallow any volume operations when balance is in progress. Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
2011-11-06Btrfs: fix the new inspection ioctls for 32 bit compatChris Mason1-6/+5
The new ioctls to follow backrefs are not clean for 32/64 bit compat. This reworks them for u64s everywhere. They are brand new, so there are no problems with changing the interface now. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-09-29btrfs: new ioctls to do logical->inode and inode->path resolvingJan Schmidt1-0/+19
these ioctls make use of the new functions initially added for scrub. they return all inodes belonging to a logical address (BTRFS_IOC_LOGICAL_INO) and all paths belonging to an inode (BTRFS_IOC_INO_PATHS). Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2011-09-29btrfs: added helper functions to iterate backrefsJan Schmidt1-0/+11
These helper functions iterate back references and call a function for each backref. There is also a function to resolve an inode to a path in the file system. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2011-05-27Btrfs: add mount -o auto_defragChris Mason1-31/+0
This will detect small random writes into files and queue the up for an auto defrag process. It isn't well suited to database workloads yet, but works for smaller files such as rpm, sqlite or bdb databases. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2011-05-12btrfs: add readonly flagArne Jansen1-0/+1
setting the readonly flag prevents writes in case an error is detected Signed-off-by: Arne Jansen <sensille@gmx.net>
2011-05-12btrfs: new ioctls for scrubJan Schmidt1-0/+38
adds ioctls necessary to start and cancel scrubs, to get current progress and to get info about devices to be scrubbed. Note that the scrub is done per-device and that the ioctl only returns after the scrub for this devices is finished or has been canceled. Signed-off-by: Arne Jansen <sensille@gmx.net>
2011-05-12btrfs: scrubArne Jansen1-0/+37
This adds an initial implementation for scrub. It works quite straightforward. The usermode issues an ioctl for each device in the fs. For each device, it enumerates the allocated device chunks. For each chunk, the contained extents are enumerated and the data checksums fetched. The extents are read sequentially and the checksums verified. If an error occurs (checksum or EIO), a good copy is searched for. If one is found, the bad copy will be rewritten. All enumerations happen from the commit roots. During a transaction commit, the scrubs get paused and afterwards continue from the new roots. This commit is based on the series originally posted to linux-btrfs with some improvements that resulted from comments from David Sterba, Ilya Dryomov and Jan Schmidt. Signed-off-by: Arne Jansen <sensille@gmx.net>
2011-01-16Merge branch 'lzo-support' of git://repo.or.cz/linux-btrfs-devel into btrfs-38Chris Mason1-1/+8
2010-12-23Btrfs: Add BTRFS_IOC_SUBVOL_GETFLAGS/SETFLAGS ioctlsLi Zefan1-0/+2
This allows us to set a snapshot or a subvolume readonly or writable on the fly. Usage: Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2->flags, and then call ioctl(BTRFS_IOCTL_SUBVOL_SETFLAGS); Changelog for v3: - Change to pass __u64 as ioctl parameter. Changelog for v2: - Add _GETFLAGS ioctl. - Check if the passed fd is the root of a subvolume. - Change the name from _SNAP_SETFLAGS to _SUBVOL_SETFLAGS. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2010-12-23Btrfs: Add readonly snapshots supportLi Zefan1-0/+1
Usage: Set BTRFS_SUBVOL_RDONLY of btrfs_ioctl_vol_arg_v2->flags, and call ioctl(BTRFS_I0CTL_SNAP_CREATE_V2). Implementation: - Set readonly bit of btrfs_root_item->flags. - Add readonly checks in btrfs_permission (inode_permission), btrfs_setattr, btrfs_set/remove_xattr and some ioctls. Changelog for v3: - Eliminate btrfs_root->readonly, but check btrfs_root->root_item.flags. - Rename BTRFS_ROOT_SNAP_RDONLY to BTRFS_ROOT_SUBVOL_RDONLY. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2010-12-22btrfs: Allow to specify compress method when defragLi Zefan1-1/+8
Update defrag ioctl, so one can choose lzo or zlib when turning on compression in defrag operation. Changelog: v1 -> v2 - Add incompability flag. - Fix to check invalid compress type. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
2010-12-11Btrfs: Make async snapshot ioctl more genericLi Zefan1-5/+9
If we had reserved some bytes in struct btrfs_ioctl_vol_args, we wouldn't have to create a new structure for async snapshot creation. Here we convert async snapshot ioctl to use a more generic ABI, as we'll add more ioctls for snapshots/subvolumes in the future, readonly snapshots for example. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-10-30Btrfs: add SNAP_CREATE_ASYNC ioctlSage Weil1-1/+10
Create a snap without waiting for it to commit to disk. The ioctl is ordered such that subsequent operations will not be contained by the created snapshot, and the commit is initiated, but the ioctl does not wait for the snapshot to commit to disk. We return the specific transid to userspace so that an application can wait for this specific snapshot creation to commit via the WAIT_SYNC ioctl. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-10-29Btrfs: add START_SYNC, WAIT_SYNC ioctlsSage Weil1-0/+2
START_SYNC will start a sync/commit, but not wait for it to complete. Any modification started after the ioctl returns is guaranteed not to be included in the commit. If a non-NULL pointer is passed, the transaction id will be returned to userspace. WAIT_SYNC will wait for any in-progress commit to complete. If a transaction id is specified, the ioctl will block and then return (success) when the specified transaction has committed. If it has already committed when we call the ioctl, it returns immediately. If the specified transaction doesn't exist, it returns EINVAL. If no transaction id is specified, WAIT_SYNC will wait for the currently committing transaction to finish it's commit to disk. If there is no currently committing transaction, it returns success. These ioctls are useful for applications which want to impose an ordering on when fs modifications reach disk, but do not want to wait for the full (slow) commit process to do so. Picky callers can take the transid returned by START_SYNC and feed it to WAIT_SYNC, and be certain to wait only as long as necessary for the transaction _they_ started to reach disk. Sloppy callers can START_SYNC and WAIT_SYNC without a transid, and provided they didn't wait too long between the calls, they will get the same result. However, if a second commit starts before they call WAIT_SYNC, they may end up waiting longer for it to commit as well. Even so, a START_SYNC+WAIT_SYNC still guarantees that any operation completed before the START_SYNC reaches disk. Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-03-16Btrfs: use __u64 types in ioctl.hSage Weil1-5/+5
Signed-off-by: Sage Weil <sage@newdream.net> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-03-15Btrfs: add a "df" ioctl for btrfsJosef Bacik1-1/+13
df is a very loaded question in btrfs. This gives us a way to get the per-space usage information so we can tell exactly what is in use where. This will help us figure out ENOSPC problems, and help users better understand where their disk space is going. Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-03-15Btrfs: add new defrag-range ioctl.Chris Mason1-0/+31
The btrfs defrag ioctl was limited to doing the entire file. This commit adds a new interface that can defrag a specific range inside the file. It can also force compression on the file, allowing you to selectively compress individual files after they were created, even when mount -o compress isn't turned on. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-03-15Btrfs: add ioctl and incompat flag to set the default mount subvolJosef Bacik1-0/+2
This patch needs to go along with my previous patch. This lets us set the default dir item's location to whatever root we want to use as our default mounting subvol. With this we don't have to use mount -o subvol=<tree id> anymore to mount a different subvol, we can just set the new one and it will just magically work. I've done some moderate testing with this, mostly just switching the default mount around, mounting subvols and the default mount at the same time and such, everything seems to work. Thanks, Older kernels would generally be able to still mount the filesystem with the default subvolume set, but it would result in a different volume being mounted, which could be an even more unpleasant suprise for users. So if you set your default subvolume, you can't go back to older kernels. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-03-15Btrfs: add search and inode lookup ioctlsChris Mason1-0/+66
The search ioctl is a generic tool for doing btree searches from userland applications. The first user of the search ioctl is a subvolume listing feature, but we'll also use it to find new files in a subvolume. The search ioctl allows you to specify min and max keys to search for, along with min and max transid. It returns the items along with a header that includes the item key. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-09-22Btrfs: add snapshot/subvolume destroy ioctlYan, Zheng1-1/+2
This patch adds snapshot/subvolume destroy ioctl. A subvolume that isn't being used and doesn't contains links to other subvolumes can be destroyed. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
2009-01-16Btrfs: fix ioctl arg size (userland incompatible change!)Chris Mason1-6/+8
The structure used to send device in btrfs ioctl calls was not properly aligned, and so 32 bit ioctls would not work properly on 64 bit kernels. We could fix this with compat ioctls, but we're just one byte away and it doesn't make sense at this stage to carry about the compat ioctls forever at this stage in the project. This patch brings the ioctl arg up to an evenly aligned 4k. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-18Btrfs: Allow subvolumes and snapshots anywhere in the directory treeChris Mason1-2/+5
Before, all snapshots and subvolumes lived in a single flat directory. This was awkward and confusing because the single flat directory was only writable with the ioctls. This commit changes the ioctls to create subvols and snapshots at any point in the directory tree. This requires making separate ioctls for snapshot and subvol creation instead of a combining them into one. The subvol ioctl does: btrfsctl -S subvol_name parent_dir After the ioctl is done subvol_name lives inside parent_dir. The snapshot ioctl does: btrfsctl -s path_for_snapshot root_to_snapshot path_for_snapshot can be an absolute or relative path. btrfsctl breaks it up into directory and basename components. root_to_snapshot can be any file or directory in the FS. The snapshot is taken of the entire root where that file lives. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-11-12Btrfs: allow clone of an arbitrary file rangeSage Weil1-0/+9
This patch adds an additional CLONE_RANGE ioctl to clone an arbitrary (block-aligned) file range to another file. The original CLONE ioctl becomes a special case of cloning the entire file range. The logic is a bit more complex now since ranges may be cloned to different offsets, and because we may only be cloning the beginning or end of a particular extent or checksum item. An additional sanity check ensures the source and destination files aren't the same (which would previously deadlock), although eventually this could be extended to allow the duplication of file data at a different offset within the same file. Any extents within the destination range in the target file are dropped. We currently do not cope with the case where a compressed inline extent needs to be split. This will probably require decompressing the extent into a temporary address_space, and inserting just the cloned portion as a new compressed inline extent. For now, just return -EINVAL in this case. Note that this never comes up in the more common case of cloning an entire file. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: transaction ioctlsSage Weil1-0/+9
These ioctls let a user application hold a transaction open while it performs a series of operations. A final ioctl does a sync on the fs (closing the current transaction). This is the main requirement for Ceph's OSD to be able to keep the data it's storing in a btrfs volume consistent, and AFAICS it works just fine. The application would do something like fd = ::open("some/file", O_RDONLY); ::ioctl(fd, BTRFS_IOC_TRANS_START); /* do a bunch of stuff */ ::ioctl(fd, BTRFS_IOC_TRANS_END); or just ::close(fd); And to ensure it commits to disk, ::ioctl(fd, BTRFS_IOC_SYNC); When a transaction is held open, the trans_handle is attached to the struct file (via private_data) so that it will get cleaned up if the process dies unexpectedly. A held transaction is also ended on fsync() to avoid a deadlock. A misbehaving application could also deliberately hold a transaction open, effectively locking up the FS, so it may make sense to restrict something like this to root or something. Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Clone file data ioctlSage Weil1-0/+1
Add a new ioctl to clone file data Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add new ioctl to add devicesChris Mason1-0/+6
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Add support for device scanning and detection ioctlsChris Mason1-1/+5
Signed-off-by: Chris Mason <chris.mason@oracle.com>
2008-09-25Btrfs: Support for online FS resize (grow and shrink)Chris Mason1-0/+2
Signed-off-by: Chris Mason <chris.mason@oracle.com>