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2019-12-05iomap: stop using ioend after it's been freed in iomap_finish_ioend()Zorro Lang
This patch fixes the following KASAN report. The @ioend has been freed by dio_put(), but the iomap_finish_ioend() still trys to access its data. [20563.631624] BUG: KASAN: use-after-free in iomap_finish_ioend+0x58c/0x5c0 [20563.638319] Read of size 8 at addr fffffc0c54a36928 by task kworker/123:2/22184 [20563.647107] CPU: 123 PID: 22184 Comm: kworker/123:2 Not tainted 5.4.0+ #1 [20563.653887] Hardware name: HPE Apollo 70 /C01_APACHE_MB , BIOS L50_5.13_1.11 06/18/2019 [20563.664499] Workqueue: xfs-conv/sda5 xfs_end_io [xfs] [20563.669547] Call trace: [20563.671993] dump_backtrace+0x0/0x370 [20563.675648] show_stack+0x1c/0x28 [20563.678958] dump_stack+0x138/0x1b0 [20563.682455] print_address_description.isra.9+0x60/0x378 [20563.687759] __kasan_report+0x1a4/0x2a8 [20563.691587] kasan_report+0xc/0x18 [20563.694985] __asan_report_load8_noabort+0x18/0x20 [20563.699769] iomap_finish_ioend+0x58c/0x5c0 [20563.703944] iomap_finish_ioends+0x110/0x270 [20563.708396] xfs_end_ioend+0x168/0x598 [xfs] [20563.712823] xfs_end_io+0x1e0/0x2d0 [xfs] [20563.716834] process_one_work+0x7f0/0x1ac8 [20563.720922] worker_thread+0x334/0xae0 [20563.724664] kthread+0x2c4/0x348 [20563.727889] ret_from_fork+0x10/0x18 [20563.732941] Allocated by task 83403: [20563.736512] save_stack+0x24/0xb0 [20563.739820] __kasan_kmalloc.isra.9+0xc4/0xe0 [20563.744169] kasan_slab_alloc+0x14/0x20 [20563.747998] slab_post_alloc_hook+0x50/0xa8 [20563.752173] kmem_cache_alloc+0x154/0x330 [20563.756185] mempool_alloc_slab+0x20/0x28 [20563.760186] mempool_alloc+0xf4/0x2a8 [20563.763845] bio_alloc_bioset+0x2d0/0x448 [20563.767849] iomap_writepage_map+0x4b8/0x1740 [20563.772198] iomap_do_writepage+0x200/0x8d0 [20563.776380] write_cache_pages+0x8a4/0xed8 [20563.780469] iomap_writepages+0x4c/0xb0 [20563.784463] xfs_vm_writepages+0xf8/0x148 [xfs] [20563.788989] do_writepages+0xc8/0x218 [20563.792658] __writeback_single_inode+0x168/0x18f8 [20563.797441] writeback_sb_inodes+0x370/0xd30 [20563.801703] wb_writeback+0x2d4/0x1270 [20563.805446] wb_workfn+0x344/0x1178 [20563.808928] process_one_work+0x7f0/0x1ac8 [20563.813016] worker_thread+0x334/0xae0 [20563.816757] kthread+0x2c4/0x348 [20563.819979] ret_from_fork+0x10/0x18 [20563.825028] Freed by task 22184: [20563.828251] save_stack+0x24/0xb0 [20563.831559] __kasan_slab_free+0x10c/0x180 [20563.835648] kasan_slab_free+0x10/0x18 [20563.839389] slab_free_freelist_hook+0xb4/0x1c0 [20563.843912] kmem_cache_free+0x8c/0x3e8 [20563.847745] mempool_free_slab+0x20/0x28 [20563.851660] mempool_free+0xd4/0x2f8 [20563.855231] bio_free+0x33c/0x518 [20563.858537] bio_put+0xb8/0x100 [20563.861672] iomap_finish_ioend+0x168/0x5c0 [20563.865847] iomap_finish_ioends+0x110/0x270 [20563.870328] xfs_end_ioend+0x168/0x598 [xfs] [20563.874751] xfs_end_io+0x1e0/0x2d0 [xfs] [20563.878755] process_one_work+0x7f0/0x1ac8 [20563.882844] worker_thread+0x334/0xae0 [20563.886584] kthread+0x2c4/0x348 [20563.889804] ret_from_fork+0x10/0x18 [20563.894855] The buggy address belongs to the object at fffffc0c54a36900 which belongs to the cache bio-1 of size 248 [20563.906844] The buggy address is located 40 bytes inside of 248-byte region [fffffc0c54a36900, fffffc0c54a369f8) [20563.918485] The buggy address belongs to the page: [20563.923269] page:ffffffff82f528c0 refcount:1 mapcount:0 mapping:fffffc8e4ba31900 index:0xfffffc0c54a33300 [20563.932832] raw: 17ffff8000000200 ffffffffa3060100 0000000700000007 fffffc8e4ba31900 [20563.940567] raw: fffffc0c54a33300 0000000080aa0042 00000001ffffffff 0000000000000000 [20563.948300] page dumped because: kasan: bad access detected [20563.955345] Memory state around the buggy address: [20563.960129] fffffc0c54a36800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc [20563.967342] fffffc0c54a36880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [20563.974554] >fffffc0c54a36900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [20563.981766] ^ [20563.986288] fffffc0c54a36980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc [20563.993501] fffffc0c54a36a00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [20564.000713] ================================================================== Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=205703 Signed-off-by: Zorro Lang <zlang@redhat.com> Fixes: 9cd0ed63ca514 ("iomap: enhance writeback error message") Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-12-04iomap: fix sub-page uptodate handlingChristoph Hellwig
bio completions can race when a page spans more than one file system block. Add a spinlock to synchronize marking the page uptodate. Fixes: 9dc55f1389f9 ("iomap: add support for sub-pagesize buffered I/O without buffer heads") Reported-by: Jan Stancek <jstancek@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-11-26iomap: remove unneeded variable in iomap_dio_rw()Johannes Thumshirn
The 'start' variable indicates the start of a filemap and is set to the iocb's position, which we have already cached as 'pos', upon function entry. 'pos' is used as a cursor indicating the current position and updated later in iomap_dio_rw(), but not before the last use of 'start'. Remove 'start' as it's synonym for 'pos' before we're entering the loop calling iomapp_apply(). Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-11-26iomap: Do not create fake iter in iomap_dio_bio_actor()Jan Kara
iomap_dio_bio_actor() copies iter to a local variable and then limits it to a file extent we have mapped. When IO is submitted, iomap_dio_bio_actor() advances the original iter while the copied iter is advanced inside bio_iov_iter_get_pages(). This logic is non-obvious especially because both iters still point to same shared structures (such as pipe info) so if iov_iter_advance() changes anything in the shared structure, this scheme breaks. Let's just truncate and reexpand the original iter as needed instead of playing games with copying iters and keeping them in sync. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-11-22iomap: Fix pipe page leakage during splicingJan Kara
When splicing using iomap_dio_rw() to a pipe, we may leak pipe pages because bio_iov_iter_get_pages() records that the pipe will have full extent worth of data however if file size is not block size aligned iomap_dio_rw() returns less than what bio_iov_iter_get_pages() set up and splice code gets confused leaking a pipe page with the file tail. Handle the situation similarly to the old direct IO implementation and revert iter to actually returned read amount which makes iter consistent with value returned from iomap_dio_rw() and thus the splice code is happy. Fixes: ff6a9292e6f6 ("iomap: implement direct I/O") CC: stable@vger.kernel.org Reported-by: syzbot+991400e8eba7e00a26e1@syzkaller.appspotmail.com Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-11-22iomap: trace iomap_appply resultsDarrick J. Wong
Add some tracepoints so that we can more easily debug what the filesystem is returning from ->iomap_begin. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-11-11iomap: fix return value of iomap_dio_bio_actor on 32bit systemsJan Stancek
Naresh reported LTP diotest4 failing for 32bit x86 and arm -next kernels on ext4. Same problem exists in 5.4-rc7 on xfs. The failure comes down to: openat(AT_FDCWD, "testdata-4.5918", O_RDWR|O_DIRECT) = 4 mmap2(NULL, 4096, PROT_READ, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0xb7f7b000 read(4, 0xb7f7b000, 4096) = 0 // expects -EFAULT Problem is conversion at iomap_dio_bio_actor() return. Ternary operator has a return type and an attempt is made to convert each of operands to the type of the other. In this case "ret" (int) is converted to type of "copied" (unsigned long). Both have size of 4 bytes: size_t copied = 0; int ret = -14; long long actor_ret = copied ? copied : ret; On x86_64: actor_ret == -14; On x86 : actor_ret == 4294967282 Replace ternary operator with 2 return statements to avoid this unwanted conversion. Fixes: 4721a6010990 ("iomap: dio data corruption and spurious errors when pipes fill") Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Signed-off-by: Jan Stancek <jstancek@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-11-08iomap: iomap_bmap should check iomap_apply return valueDarrick J. Wong
Coverity caught this fairly minor bug, but we should check the return value of iomap_apply regardless. Coverity-id: 1437065 Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-11-07iomap: Fix overflow in iomap_page_mkwriteAndreas Gruenbacher
On architectures where loff_t is wider than pgoff_t, the expression ((page->index + 1) << PAGE_SHIFT) can overflow. Rewrite to use the page offset, which we already compute here anyway. Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-29fs/iomap: remove redundant check in iomap_dio_rw()Joseph Qi
We've already check if it is READ iov_iter, no need check again. Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Jens Axboe <axboe@kernel.dk> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: use a srcmap for a read-modify-write I/OGoldwyn Rodrigues
The srcmap is used to identify where the read is to be performed from. It is passed to ->iomap_begin, which can fill it in if we need to read data for partially written blocks from a different location than the write target. The srcmap is only supported for buffered writes so far. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com> [hch: merged two patches, removed the IOMAP_F_COW flag, use iomap as srcmap if not set, adjust length down to srcmap end as well] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Acked-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
2019-10-21iomap: use write_begin to read pages to unshareChristoph Hellwig
Use the existing iomap write_begin code to read the pages unshared by iomap_file_unshare. That avoids the extra ->readpage call and extent tree lookup currently done by read_mapping_page. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: move the zeroing case out of iomap_read_page_syncChristoph Hellwig
That keeps the function a little easier to understand, and easier to modify for pending enhancements. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: ignore non-shared or non-data blocks in xfs_file_dirtyChristoph Hellwig
xfs_file_dirty is used to unshare reflink blocks. Rename the function to xfs_file_unshare to better document that purpose, and skip iomaps that are not shared and don't need zeroing. This will allow to simplify the caller. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: always use AOP_FLAG_NOFS in iomap_write_beginChristoph Hellwig
All callers pass AOP_FLAG_NOFS, so lift that flag to iomap_write_begin to allow reusing the flags arguments for an internal flags namespace soon. Also remove the local index variable that is only used once. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: remove the unused iomap argument to __iomap_write_endChristoph Hellwig
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Allison Collins <allison.henderson@oracle.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: enhance writeback error messageDarrick J. Wong
If we encounter an IO error during writeback, log the inode, offset, and sector number of the failure, instead of forcing the user to do some sort of reverse mapping to figure out which file is affected. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-10-21iomap: pass a struct page to iomap_finish_page_writebackChristoph Hellwig
No need to pass the full bio_vec. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: cleanup iomap_ioend_compareChristoph Hellwig
Move the initialization of ia and ib to the declaration line and remove a superflous else. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: move struct iomap_page out of iomap.hChristoph Hellwig
Now that all the writepage code is in the iomap code there is no need to keep this structure public. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: warn on inline maps in iomap_writepage_mapChristoph Hellwig
And inline mapping should never mark the page dirty and thus never end up in writepages. Add a check for that condition and warn if it happens. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: lift the xfs writeback code to iomapChristoph Hellwig
Take the xfs writeback code and move it to fs/iomap. A new structure with three methods is added as the abstraction from the generic writeback code to the file system. These methods are used to map blocks, submit an ioend, and cancel a page that encountered an error before it was added to an ioend. Signed-off-by: Christoph Hellwig <hch@lst.de> [darrick: rename ->submit_ioend to ->prepare_ioend to clarify what it does] Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Dave Chinner <dchinner@redhat.com>
2019-10-21iomap: lift common tracing code from xfs to iomapChristoph Hellwig
Lift the xfs code for tracing address space operations to the iomap layer. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-21iomap: zero newly allocated mapped blocksChristoph Hellwig
File systems like gfs2 don't support delayed allocations or unwritten extents and thus allocate normal mapped blocks to fill holes. To cover the case of such file systems allocating new blocks to fill holes also zero out mapped blocks with the new flag. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-10-15iomap: Allow forcing of waiting for running DIO in iomap_dio_rw()Jan Kara
Filesystems do not support doing IO as asynchronous in some cases. For example in case of unaligned writes or in case file size needs to be extended (e.g. for ext4). Instead of forcing filesystem to wait for AIO in such cases, add argument to iomap_dio_rw() which makes the function wait for IO completion. This also results in executing iomap_dio_complete() inline in iomap_dio_rw() providing its return value to the caller as for ordinary sync IO. Signed-off-by: Jan Kara <jack@suse.cz> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-09-19iomap: move the iomap_dio_rw ->end_io callback into a structureChristoph Hellwig
Add a new iomap_dio_ops structure that for now just contains the end_io handler. This avoid storing the function pointer in a mutable structure, which is a possible exploit vector for kernel code execution, and prepares for adding a submit_io handler that btrfs needs. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
2019-09-19iomap: split size and error for iomap_dio_rw ->end_ioMatthew Bobrowski
Modify the calling convention for the iomap_dio_rw ->end_io() callback. Rather than passing either dio->error or dio->size as the 'size' argument, instead pass both the dio->error and the dio->size value separately. In the instance that an error occurred during a write, we currently cannot determine whether any blocks have been allocated beyond the current EOF and data has subsequently been written to these blocks within the ->end_io() callback. As a result, we cannot judge whether we should take the truncate failed write path. Having both dio->error and dio->size will allow us to perform such checks within this callback. Signed-off-by: Matthew Bobrowski <mbobrowski@mbobrowski.org> [hch: minor cleanups] Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
2019-07-25iomap: fix Invalid License IDMasahiro Yamada
Detected by: $ ./scripts/spdxcheck.py fs/iomap/Makefile: 1:27 Invalid License ID: GPL-2.0-or-newer Fixes: 1c230208f53d ("iomap: start moving code to fs/iomap/") Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-19Merge tag 'iomap-5.3-merge-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linuxLinus Torvalds
Pull iomap split/cleanup from Darrick Wong: "As promised, here's the second part of the iomap merge for 5.3, in which we break up iomap.c into smaller files grouped by functional area so that it'll be easier in the long run to maintain cohesiveness of code units and to review incoming patches. There are no functional changes and fs/iomap.c split cleanly. Summary: - Regroup the fs/iomap.c code by major functional area so that we can start development for 5.4 from a more stable base" * tag 'iomap-5.3-merge-4' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: iomap: move internal declarations into fs/iomap/ iomap: move the main iteration code into a separate file iomap: move the buffered IO code into a separate file iomap: move the direct IO code into a separate file iomap: move the SEEK_HOLE code into a separate file iomap: move the file mapping reporting code into a separate file iomap: move the swapfile code into a separate file iomap: start moving code to fs/iomap/
2019-07-17iomap: move internal declarations into fs/iomap/Darrick J. Wong
Move internal function declarations out of fs/internal.h into include/linux/iomap.h so that our transition is complete. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-17iomap: move the main iteration code into a separate fileDarrick J. Wong
Move the main iteration code into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-17iomap: move the buffered IO code into a separate fileDarrick J. Wong
Move the buffered IO code into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-17iomap: move the direct IO code into a separate fileDarrick J. Wong
Move the direct IO code into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-17iomap: move the SEEK_HOLE code into a separate fileDarrick J. Wong
Move the SEEK_HOLE/SEEK_DATA code into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-17iomap: move the file mapping reporting code into a separate fileDarrick J. Wong
Move the file mapping reporting code (FIEMAP/FIBMAP) into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-17iomap: move the swapfile code into a separate fileDarrick J. Wong
Move the swapfile activation code into a separate file so that we can group related functions in a single file instead of having a single enormous source file. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
2019-07-15iomap: start moving code to fs/iomap/Darrick J. Wong
Create the build infrastructure we need to start migrating iomap code to fs/iomap/ from fs/iomap.c. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
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