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path: root/fs/btrfs/backref.h
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2015-01-14btrfs: cleanup, remove inode_item_info helperDavid Sterba
It's only a simple wrapper around btrfs_find_item, the locally defined key is not used. Signed-off-by: David Sterba <dsterba@suse.cz>
2014-09-17Btrfs: make fiemap not blow when you have lots of snapshotsJosef Bacik
We have been iterating all references for each extent we have in a file when we do fiemap to see if it is shared. This is fine when you have a few clones or a few snapshots, but when you have 5k snapshots suddenly fiemap just sits there and stares at you. So add btrfs_check_shared which will use the backref walking code but will short circuit as soon as it finds a root or inode that doesn't match the one we currently have. This makes fiemap on my testbox go from looking at me blankly for a day to spitting out actual output in a reasonable amount of time. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-06-09Btrfs: fix scrub_print_warning to handle skinny metadata extentsLiu Bo
The skinny extents are intepreted incorrectly in scrub_print_warning(), and end up hitting the BUG() in btrfs_extent_inline_ref_size. Reported-by: Konstantinos Skarlatos <k.skarlatos@gmail.com> Signed-off-by: Liu Bo <bo.li.liu@oracle.com> Signed-off-by: Chris Mason <clm@fb.com>
2014-06-09Btrfs: rework qgroup accountingJosef Bacik
Currently qgroups account for space by intercepting delayed ref updates to fs trees. It does this by adding sequence numbers to delayed ref updates so that it can figure out how the tree looked before the update so we can adjust the counters properly. The problem with this is that it does not allow delayed refs to be merged, so if you say are defragging an extent with 5k snapshots pointing to it we will thrash the delayed ref lock because we need to go back and manually merge these things together. Instead we want to process quota changes when we know they are going to happen, like when we first allocate an extent, we free a reference for an extent, we add new references etc. This patch accomplishes this by only adding qgroup operations for real ref changes. We only modify the sequence number when we need to lookup roots for bytenrs, this reduces the amount of churn on the sequence number and allows us to merge delayed refs as we add them most of the time. This patch encompasses a bunch of architectural changes 1) qgroup ref operations: instead of tracking qgroup operations through the delayed refs we simply add new ref operations whenever we notice that we need to when we've modified the refs themselves. 2) tree mod seq: we no longer have this separation of major/minor counters. this makes the sequence number stuff much more sane and we can remove some locking that was needed to protect the counter. 3) delayed ref seq: we now read the tree mod seq number and use that as our sequence. This means each new delayed ref doesn't have it's own unique sequence number, rather whenever we go to lookup backrefs we inc the sequence number so we can make sure to keep any new operations from screwing up our world view at that given point. This allows us to merge delayed refs during runtime. With all of these changes the delayed ref stuff is a little saner and the qgroup accounting stuff no longer goes negative in some cases like it was before. Thanks, Signed-off-by: Josef Bacik <jbacik@fb.com> Signed-off-by: Chris Mason <clm@fb.com>
2013-09-01Btrfs: allocate prelim_ref with a slab allocaterWang Shilong
struct __prelim_ref is allocated and freed frequently when walking backref tree, using slab allocater can not only speed up allocating but also detect memory leaks. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Reviewed-by: Miao Xie <miaox@cn.fujitsu.com> Reviewed-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
2013-07-01Btrfs: cleanup backref search commit root flag stuffJosef Bacik
Looking into this backref problem I noticed we're using a macro to what turns out to essentially be a NULL check to see if we need to search the commit root. I'm killing this, let's just do what everybody else does and checks if trans == NULL. I've also made it so we pass in the path to __resolve_indirect_refs which will have the search_commit_root flag set properly already and that way we can avoid allocating another path when we have a perfectly good one to use. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-05-06btrfs: make static code static & remove dead codeEric Sandeen
Big patch, but all it does is add statics to functions which are in fact static, then remove the associated dead-code fallout. removed functions: btrfs_iref_to_path() __btrfs_lookup_delayed_deletion_item() __btrfs_search_delayed_insertion_item() __btrfs_search_delayed_deletion_item() find_eb_for_page() btrfs_find_block_group() range_straddles_pages() extent_range_uptodate() btrfs_file_extent_length() btrfs_scrub_cancel_devid() btrfs_start_transaction_lflush() btrfs_print_tree() is left because it is used for debugging. btrfs_start_transaction_lflush() and btrfs_reada_detach() are left for symmetry. ulist.c functions are left, another patch will take care of those. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
2013-02-20Btrfs: move fs/btrfs/ioctl.h to include/uapi/linux/btrfs.hFilipe Brandenburger
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>
2012-10-25Btrfs: extended inode refs support for send mechanismJan Schmidt
This adds support for the new extended inode refs to btrfs send. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-10-09btrfs: extended inode ref iterationMark Fasheh
The iterate_irefs in backref.c is used to build path components from inode refs. This patch adds code to iterate extended refs as well. I had modify the callback function signature to abstract out some of the differences between ref structures. iref_to_path() also needed similar changes. Signed-off-by: Mark Fasheh <mfasheh@suse.de>
2012-10-09btrfs: extended inode refsMark Fasheh
This patch adds basic support for extended inode refs. This includes support for link and unlink of the refs, which basically gets us support for rename as well. Inode creation does not need changing - extended refs are only added after the ref array is full. Signed-off-by: Mark Fasheh <mfasheh@suse.de>
2012-10-01Btrfs: fix a bug in parsing return value in logical resolveLiu Bo
In logical resolve, we parse extent_from_logical()'s 'ret' as a kind of flag. It is possible to lose our errors because (-EXXXX & BTRFS_EXTENT_FLAG_TREE_BLOCK) is true. I'm not sure if it is on purpose, it just looks too hacky if it is. I'd rather use a real flag and a 'ret' to catch errors. Acked-by: Jan Schmidt <list.btrfs@jan-o-sch.net> Signed-off-by: Liu Bo <liub.liubo@gmail.com>
2012-07-25Merge branch 'send-v2' of git://github.com/ablock84/linux-btrfs into for-linusChris Mason
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>
2012-07-25Btrfs: make iref_to_path non staticAlexander Block
Make iref_to_path non static (needed in send) and rename it to btrfs_iref_to_path Signed-off-by: Alexander Block <ablock84@googlemail.com>
2012-07-10Btrfs: join tree mod log code with the code holding back delayed refsJan Schmidt
We've got two mechanisms both required for reliable backref resolving (tree mod log and holding back delayed refs). You cannot make use of one without the other. So instead of requiring the user of this mechanism to setup both correctly, we join them into a single interface. Additionally, we stop inserting non-blockers into fs_info->tree_mod_seq_list as we did before, which was of no value. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-05-30Btrfs: use the tree modification log for backref resolvingJan Schmidt
This enables backref resolving on life trees while they are changing. This is a prerequisite for quota groups and just nice to have for everything else. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-05-26Btrfs: look into the extent during find_all_leafsJan Schmidt
Before this patch we called find_all_leafs for a data extent, then called find_all_roots and then looked into the extent to grab the information we were seeking. This was done without holding the leaves locked to avoid deadlocks. However, this can obviouly race with concurrent tree modifications. Instead, we now look into the extent while we're holding the lock during find_all_leafs and store this information together with the leaf list. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-03-27Btrfs: fix regression in scrub path resolvingJan Schmidt
In commit 4692cf58 we introduced new backref walking code for btrfs. This assumes we're searching live roots, which requires a transaction context. While scrubbing, however, we must not join a transaction because this could deadlock with the commit path. Additionally, what scrub really wants to do is resolving a logical address in the commit root it's currently checking. This patch adds support for logical to path resolving on commit roots and makes scrub use that. Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2012-01-04Btrfs: added btrfs_find_all_roots()Jan Schmidt
This function gets a byte number (a data extent), collects all the leafs pointing to it and walks up the trees to find all fs roots pointing to those leafs. It also returns the list of all leafs pointing to that extent. It does proper locking for the involved trees, can be used on busy file systems and honors delayed refs. Signed-off-by: Arne Jansen <sensille@gmx.net> Signed-off-by: Jan Schmidt <list.btrfs@jan-o-sch.net>
2011-09-29btrfs: added helper functions to iterate backrefsJan Schmidt
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>