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5a75034e71
linux/fs/btrfs
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Josef Bacik 5a75034e71 btrfs: do not panic if we can't allocate a prealloc extent state 
We sometimes have to allocate new extent states when clearing or setting
new bits in an extent io tree.  Generally we preallocate this before
taking the tree spin lock, but we can use this preallocated extent state
sometimes and then need to try to do a GFP_ATOMIC allocation under the
lock.

Unfortunately sometimes this fails, and then we hit the BUG_ON() and
bring the box down.  This happens roughly 20 times a week in our fleet.

However the vast majority of callers use GFP_NOFS, which means that if
this GFP_ATOMIC allocation fails, we could simply drop the spin lock, go
back and allocate a new extent state with our given gfp mask, and begin
again from where we left off.

For the remaining callers that do not use GFP_NOFS, they are generally
using GFP_NOWAIT, which still allows for some reclaim.  So allow these
allocations to attempt to happen outside of the spin lock so we don't
need to rely on GFP_ATOMIC allocations.

This in essence creates an infinite loop for anything that isn't
GFP_NOFS.  To address this we may want to migrate to using mempools for
extent states so that we will always have emergency reserves in order to
make our allocations.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
2022-12-05 18:00:41 +01:00
..
tests for-6.1-rc4-tag 2022-11-10 08:58:29 -08:00
acl.c btrfs: reserve correct number of items for inode creation 2022-05-16 17:03:08 +02:00
async-thread.c btrfs: simplify WQ_HIGHPRI handling in struct btrfs_workqueue 2022-05-16 17:03:15 +02:00
async-thread.h btrfs: remove unused typedefs get_extent_t and btrfs_work_func_t 2022-07-25 17:45:36 +02:00
backref.c btrfs: avoid unnecessary resolution of indirect backrefs during fiemap 2022-12-05 18:00:39 +01:00
backref.h btrfs: avoid duplicated resolution of indirect backrefs during fiemap 2022-12-05 18:00:39 +01:00
block-group.c btrfs: skip update of block group item if used bytes are the same 2022-12-05 18:00:40 +01:00
block-group.h btrfs: skip update of block group item if used bytes are the same 2022-12-05 18:00:40 +01:00
block-rsv.c btrfs: introduce BTRFS_RESERVE_FLUSH_EMERGENCY 2022-12-05 18:00:38 +01:00
block-rsv.h btrfs: add KCSAN annotations for unlocked access to block_rsv->full 2022-09-26 12:28:02 +02:00
btrfs_inode.h btrfs: move btrfs_print_data_csum_error into inode.c 2022-12-05 18:00:37 +01:00
check-integrity.c fs/btrfs: Use the enum req_op and blk_opf_t types 2022-07-14 12:14:32 -06:00
check-integrity.h btrfs: check-integrity: split submit_bio from btrfsic checking 2022-05-16 17:03:12 +02:00
compression.c btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
compression.h btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
ctree.c btrfs: remove gfp_t flag from btrfs_tree_mod_log_insert_key() 2022-12-05 18:00:40 +01:00
ctree.h btrfs: convert BTRFS_ILOCK-* defines to enum bit 2022-12-05 18:00:40 +01:00
delalloc-space.c btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
delalloc-space.h btrfs: add the ability to use NO_FLUSH for data reservations 2022-09-29 17:08:28 +02:00
delayed-inode.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
delayed-inode.h btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
delayed-ref.c btrfs: switch btrfs_block_rsv::full to bool 2022-07-25 17:45:40 +02:00
delayed-ref.h btrfs: remove btrfs_delayed_extent_op::is_data 2022-05-16 17:17:31 +02:00
dev-replace.c btrfs: don't take a bio_counter reference for cloned bios 2022-09-26 12:27:58 +02:00
dev-replace.h btrfs: add struct declarations in dev-replace.h 2022-09-26 12:28:07 +02:00
dir-item.c btrfs: use btrfs_for_each_slot in btrfs_search_dir_index_item 2022-05-16 17:03:07 +02:00
discard.c
discard.h
disk-io.c btrfs: move btrfs_get_block_group helper out of disk-io.h 2022-12-05 18:00:36 +01:00
disk-io.h btrfs: move btrfs_get_block_group helper out of disk-io.h 2022-12-05 18:00:36 +01:00
export.c btrfs: fix type of parameter generation in btrfs_get_dentry 2022-10-24 15:28:58 +02:00
export.h btrfs: fix type of parameter generation in btrfs_get_dentry 2022-10-24 15:28:58 +02:00
extent_io.c btrfs: do not use GFP_ATOMIC in the read endio 2022-12-05 18:00:40 +01:00
extent_io.h btrfs: convert extent_io page op defines to enum bits 2022-12-05 18:00:40 +01:00
extent_map.c btrfs: get the next extent map during fiemap/lseek more efficiently 2022-12-05 18:00:38 +01:00
extent_map.h btrfs: get the next extent map during fiemap/lseek more efficiently 2022-12-05 18:00:38 +01:00
extent-io-tree.c btrfs: do not panic if we can't allocate a prealloc extent state 2022-12-05 18:00:41 +01:00
extent-io-tree.h btrfs: remove unused unlock_extent_atomic 2022-12-05 18:00:41 +01:00
extent-tree.c btrfs: fix tree mod log mishandling of reallocated nodes 2022-10-24 15:28:07 +02:00
file-item.c btrfs: make can_nocow_extent nowait compatible 2022-09-29 17:08:26 +02:00
file.c btrfs: skip unnecessary delalloc search during fiemap and lseek 2022-12-05 18:00:38 +01:00
free-space-cache.c btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
free-space-cache.h btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
free-space-tree.c btrfs: get rid of block group caching progress logic 2022-09-26 12:27:58 +02:00
free-space-tree.h
inode-item.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
inode-item.h
inode.c btrfs: move free space cachep's out of ctree.h 2022-12-05 18:00:37 +01:00
ioctl.c btrfs: free btrfs_path before copying subvol info to userspace 2022-11-15 17:15:45 +01:00
Kconfig
locking.c btrfs: implement a nowait option for tree searches 2022-09-26 12:46:42 +02:00
locking.h btrfs: implement a nowait option for tree searches 2022-09-26 12:46:42 +02:00
lzo.c btrfs: replace kmap() with kmap_local_page() in lzo.c 2022-07-25 17:45:33 +02:00
Makefile btrfs: move extent state init and alloc functions to their own file 2022-09-26 12:28:03 +02:00
misc.h btrfs: add helper for bit enumeration 2022-12-05 18:00:40 +01:00
ordered-data.c btrfs: use cached_state for btrfs_check_nocow_lock 2022-12-05 18:00:36 +01:00
ordered-data.h btrfs: use cached_state for btrfs_check_nocow_lock 2022-12-05 18:00:36 +01:00
orphan.c
print-tree.c btrfs: unify the error handling pattern for read_tree_block() 2022-03-14 13:13:53 +01:00
print-tree.h
props.c btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
props.h btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
qgroup.c btrfs: qgroup: fix sleep from invalid context bug in btrfs_qgroup_inherit() 2022-11-21 14:57:52 +01:00
qgroup.h btrfs: convert QGROUP_* defines to enum bits 2022-12-05 18:00:40 +01:00
raid56.c btrfs: raid56: make it more explicit that cache rbio should have all its data sectors uptodate 2022-12-05 18:00:38 +01:00
raid56.h btrfs: properly abstract the parity raid bio handling 2022-09-26 12:27:59 +02:00
rcu-string.h
ref-verify.c
ref-verify.h
reflink.c btrfs: replace delete argument with EXTENT_CLEAR_ALL_BITS 2022-09-26 12:28:05 +02:00
reflink.h
relocation.c btrfs: move flush related definitions to space-info.h 2022-12-05 18:00:37 +01:00
root-tree.c btrfs: simplify error handling at btrfs_del_root_ref() 2022-09-26 12:27:58 +02:00
scrub.c btrfs: move BTRFS_MAX_MIRRORS into scrub.c 2022-12-05 18:00:37 +01:00
send.c btrfs: send: avoid unaligned encoded writes when attempting to clone range 2022-11-21 14:41:41 +01:00
send.h btrfs: send: allow protocol version 3 with CONFIG_BTRFS_DEBUG 2022-10-11 14:46:55 +02:00
space-info.c btrfs: introduce BTRFS_RESERVE_FLUSH_EMERGENCY 2022-12-05 18:00:38 +01:00
space-info.h btrfs: introduce BTRFS_RESERVE_FLUSH_EMERGENCY 2022-12-05 18:00:38 +01:00
struct-funcs.c btrfs: remove redundant check in up check_setget_bounds 2022-07-25 17:45:33 +02:00
subpage.c btrfs: convert process_page_range() to use filemap_get_folios_contig() 2022-09-11 20:26:03 -07:00
subpage.h btrfs: make nodesize >= PAGE_SIZE case to reuse the non-subpage routine 2022-05-16 17:03:11 +02:00
super.c btrfs: make module init/exit match their sequence 2022-12-05 18:00:40 +01:00
sysfs.c btrfs: sysfs: normalize the error handling branch in btrfs_init_sysfs() 2022-11-23 16:52:22 +01:00
sysfs.h
transaction.c btrfs: move trans_handle_cachep out of ctree.h 2022-12-05 18:00:37 +01:00
transaction.h btrfs: convert __TRANS_* defines to enum bits 2022-12-05 18:00:40 +01:00
tree-checker.c btrfs: tree-checker: check for overlapping extent items 2022-08-17 16:20:25 +02:00
tree-checker.h btrfs: tree-checker: check extent buffer owner against owner rootid 2022-05-16 17:03:09 +02:00
tree-defrag.c
tree-log.c btrfs: do not modify log tree while holding a leaf from fs tree locked 2022-11-23 16:52:15 +01:00
tree-log.h btrfs: use delayed items when logging a directory 2022-09-26 12:27:57 +02:00
tree-mod-log.c btrfs: remove gfp_t flag from btrfs_tree_mod_log_insert_key() 2022-12-05 18:00:40 +01:00
tree-mod-log.h btrfs: remove gfp_t flag from btrfs_tree_mod_log_insert_key() 2022-12-05 18:00:40 +01:00
ulist.c
ulist.h
uuid-tree.c
verity.c btrfs: send: add support for fs-verity 2022-09-26 12:27:55 +02:00
volumes.c btrfs: zoned: initialize device's zone info for seeding 2022-11-07 14:35:24 +01:00
volumes.h btrfs: zoned: initialize device's zone info for seeding 2022-11-07 14:35:24 +01:00
xattr.c btrfs: check if root is readonly while setting security xattr 2022-08-22 18:06:30 +02:00
xattr.h
zlib.c btrfs: zlib: replace kmap() with kmap_local_page() in zlib_decompress_bio() 2022-07-25 17:45:41 +02:00
zoned.c btrfs: use kvcalloc in btrfs_get_dev_zone_info 2022-11-23 16:51:50 +01:00
zoned.h btrfs: zoned: clone zoned device info when cloning a device 2022-11-07 14:35:21 +01:00
zstd.c btrfs: zstd: replace kmap() with kmap_local_page() 2022-07-25 17:45:40 +02:00