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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /fs/nilfs2/mdt.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'fs/nilfs2/mdt.c')
-rw-r--r-- | fs/nilfs2/mdt.c | 665 |
1 files changed, 665 insertions, 0 deletions
diff --git a/fs/nilfs2/mdt.c b/fs/nilfs2/mdt.c new file mode 100644 index 000000000..cbf4fa60e --- /dev/null +++ b/fs/nilfs2/mdt.c @@ -0,0 +1,665 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Meta data file for NILFS + * + * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. + * + * Written by Ryusuke Konishi. + */ + +#include <linux/buffer_head.h> +#include <linux/mpage.h> +#include <linux/mm.h> +#include <linux/writeback.h> +#include <linux/backing-dev.h> +#include <linux/swap.h> +#include <linux/slab.h> +#include "nilfs.h" +#include "btnode.h" +#include "segment.h" +#include "page.h" +#include "mdt.h" +#include "alloc.h" /* nilfs_palloc_destroy_cache() */ + +#include <trace/events/nilfs2.h> + +#define NILFS_MDT_MAX_RA_BLOCKS (16 - 1) + + +static int +nilfs_mdt_insert_new_block(struct inode *inode, unsigned long block, + struct buffer_head *bh, + void (*init_block)(struct inode *, + struct buffer_head *, void *)) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + void *kaddr; + int ret; + + /* Caller exclude read accesses using page lock */ + + /* set_buffer_new(bh); */ + bh->b_blocknr = 0; + + ret = nilfs_bmap_insert(ii->i_bmap, block, (unsigned long)bh); + if (unlikely(ret)) + return ret; + + set_buffer_mapped(bh); + + kaddr = kmap_atomic(bh->b_page); + memset(kaddr + bh_offset(bh), 0, i_blocksize(inode)); + if (init_block) + init_block(inode, bh, kaddr); + flush_dcache_page(bh->b_page); + kunmap_atomic(kaddr); + + set_buffer_uptodate(bh); + mark_buffer_dirty(bh); + nilfs_mdt_mark_dirty(inode); + + trace_nilfs2_mdt_insert_new_block(inode, inode->i_ino, block); + + return 0; +} + +static int nilfs_mdt_create_block(struct inode *inode, unsigned long block, + struct buffer_head **out_bh, + void (*init_block)(struct inode *, + struct buffer_head *, + void *)) +{ + struct super_block *sb = inode->i_sb; + struct nilfs_transaction_info ti; + struct buffer_head *bh; + int err; + + nilfs_transaction_begin(sb, &ti, 0); + + err = -ENOMEM; + bh = nilfs_grab_buffer(inode, inode->i_mapping, block, 0); + if (unlikely(!bh)) + goto failed_unlock; + + err = -EEXIST; + if (buffer_uptodate(bh)) + goto failed_bh; + + wait_on_buffer(bh); + if (buffer_uptodate(bh)) + goto failed_bh; + + bh->b_bdev = sb->s_bdev; + err = nilfs_mdt_insert_new_block(inode, block, bh, init_block); + if (likely(!err)) { + get_bh(bh); + *out_bh = bh; + } + + failed_bh: + unlock_page(bh->b_page); + put_page(bh->b_page); + brelse(bh); + + failed_unlock: + if (likely(!err)) + err = nilfs_transaction_commit(sb); + else + nilfs_transaction_abort(sb); + + return err; +} + +static int +nilfs_mdt_submit_block(struct inode *inode, unsigned long blkoff, blk_opf_t opf, + struct buffer_head **out_bh) +{ + struct buffer_head *bh; + __u64 blknum = 0; + int ret = -ENOMEM; + + bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0); + if (unlikely(!bh)) + goto failed; + + ret = -EEXIST; /* internal code */ + if (buffer_uptodate(bh)) + goto out; + + if (opf & REQ_RAHEAD) { + if (!trylock_buffer(bh)) { + ret = -EBUSY; + goto failed_bh; + } + } else /* opf == REQ_OP_READ */ + lock_buffer(bh); + + if (buffer_uptodate(bh)) { + unlock_buffer(bh); + goto out; + } + + ret = nilfs_bmap_lookup(NILFS_I(inode)->i_bmap, blkoff, &blknum); + if (unlikely(ret)) { + unlock_buffer(bh); + goto failed_bh; + } + map_bh(bh, inode->i_sb, (sector_t)blknum); + + bh->b_end_io = end_buffer_read_sync; + get_bh(bh); + submit_bh(opf, bh); + ret = 0; + + trace_nilfs2_mdt_submit_block(inode, inode->i_ino, blkoff, + opf & REQ_OP_MASK); + out: + get_bh(bh); + *out_bh = bh; + + failed_bh: + unlock_page(bh->b_page); + put_page(bh->b_page); + brelse(bh); + failed: + return ret; +} + +static int nilfs_mdt_read_block(struct inode *inode, unsigned long block, + int readahead, struct buffer_head **out_bh) +{ + struct buffer_head *first_bh, *bh; + unsigned long blkoff; + int i, nr_ra_blocks = NILFS_MDT_MAX_RA_BLOCKS; + int err; + + err = nilfs_mdt_submit_block(inode, block, REQ_OP_READ, &first_bh); + if (err == -EEXIST) /* internal code */ + goto out; + + if (unlikely(err)) + goto failed; + + if (readahead) { + blkoff = block + 1; + for (i = 0; i < nr_ra_blocks; i++, blkoff++) { + err = nilfs_mdt_submit_block(inode, blkoff, + REQ_OP_READ | REQ_RAHEAD, &bh); + if (likely(!err || err == -EEXIST)) + brelse(bh); + else if (err != -EBUSY) + break; + /* abort readahead if bmap lookup failed */ + if (!buffer_locked(first_bh)) + goto out_no_wait; + } + } + + wait_on_buffer(first_bh); + + out_no_wait: + err = -EIO; + if (!buffer_uptodate(first_bh)) { + nilfs_err(inode->i_sb, + "I/O error reading meta-data file (ino=%lu, block-offset=%lu)", + inode->i_ino, block); + goto failed_bh; + } + out: + *out_bh = first_bh; + return 0; + + failed_bh: + brelse(first_bh); + failed: + return err; +} + +/** + * nilfs_mdt_get_block - read or create a buffer on meta data file. + * @inode: inode of the meta data file + * @blkoff: block offset + * @create: create flag + * @init_block: initializer used for newly allocated block + * @out_bh: output of a pointer to the buffer_head + * + * nilfs_mdt_get_block() looks up the specified buffer and tries to create + * a new buffer if @create is not zero. On success, the returned buffer is + * assured to be either existing or formatted using a buffer lock on success. + * @out_bh is substituted only when zero is returned. + * + * Return Value: On success, it returns 0. On error, the following negative + * error code is returned. + * + * %-ENOMEM - Insufficient memory available. + * + * %-EIO - I/O error + * + * %-ENOENT - the specified block does not exist (hole block) + * + * %-EROFS - Read only filesystem (for create mode) + */ +int nilfs_mdt_get_block(struct inode *inode, unsigned long blkoff, int create, + void (*init_block)(struct inode *, + struct buffer_head *, void *), + struct buffer_head **out_bh) +{ + int ret; + + /* Should be rewritten with merging nilfs_mdt_read_block() */ + retry: + ret = nilfs_mdt_read_block(inode, blkoff, !create, out_bh); + if (!create || ret != -ENOENT) + return ret; + + ret = nilfs_mdt_create_block(inode, blkoff, out_bh, init_block); + if (unlikely(ret == -EEXIST)) { + /* create = 0; */ /* limit read-create loop retries */ + goto retry; + } + return ret; +} + +/** + * nilfs_mdt_find_block - find and get a buffer on meta data file. + * @inode: inode of the meta data file + * @start: start block offset (inclusive) + * @end: end block offset (inclusive) + * @blkoff: block offset + * @out_bh: place to store a pointer to buffer_head struct + * + * nilfs_mdt_find_block() looks up an existing block in range of + * [@start, @end] and stores pointer to a buffer head of the block to + * @out_bh, and block offset to @blkoff, respectively. @out_bh and + * @blkoff are substituted only when zero is returned. + * + * Return Value: On success, it returns 0. On error, the following negative + * error code is returned. + * + * %-ENOMEM - Insufficient memory available. + * + * %-EIO - I/O error + * + * %-ENOENT - no block was found in the range + */ +int nilfs_mdt_find_block(struct inode *inode, unsigned long start, + unsigned long end, unsigned long *blkoff, + struct buffer_head **out_bh) +{ + __u64 next; + int ret; + + if (unlikely(start > end)) + return -ENOENT; + + ret = nilfs_mdt_read_block(inode, start, true, out_bh); + if (!ret) { + *blkoff = start; + goto out; + } + if (unlikely(ret != -ENOENT || start == ULONG_MAX)) + goto out; + + ret = nilfs_bmap_seek_key(NILFS_I(inode)->i_bmap, start + 1, &next); + if (!ret) { + if (next <= end) { + ret = nilfs_mdt_read_block(inode, next, true, out_bh); + if (!ret) + *blkoff = next; + } else { + ret = -ENOENT; + } + } +out: + return ret; +} + +/** + * nilfs_mdt_delete_block - make a hole on the meta data file. + * @inode: inode of the meta data file + * @block: block offset + * + * Return Value: On success, zero is returned. + * On error, one of the following negative error code is returned. + * + * %-ENOMEM - Insufficient memory available. + * + * %-EIO - I/O error + */ +int nilfs_mdt_delete_block(struct inode *inode, unsigned long block) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + int err; + + err = nilfs_bmap_delete(ii->i_bmap, block); + if (!err || err == -ENOENT) { + nilfs_mdt_mark_dirty(inode); + nilfs_mdt_forget_block(inode, block); + } + return err; +} + +/** + * nilfs_mdt_forget_block - discard dirty state and try to remove the page + * @inode: inode of the meta data file + * @block: block offset + * + * nilfs_mdt_forget_block() clears a dirty flag of the specified buffer, and + * tries to release the page including the buffer from a page cache. + * + * Return Value: On success, 0 is returned. On error, one of the following + * negative error code is returned. + * + * %-EBUSY - page has an active buffer. + * + * %-ENOENT - page cache has no page addressed by the offset. + */ +int nilfs_mdt_forget_block(struct inode *inode, unsigned long block) +{ + pgoff_t index = (pgoff_t)block >> + (PAGE_SHIFT - inode->i_blkbits); + struct page *page; + unsigned long first_block; + int ret = 0; + int still_dirty; + + page = find_lock_page(inode->i_mapping, index); + if (!page) + return -ENOENT; + + wait_on_page_writeback(page); + + first_block = (unsigned long)index << + (PAGE_SHIFT - inode->i_blkbits); + if (page_has_buffers(page)) { + struct buffer_head *bh; + + bh = nilfs_page_get_nth_block(page, block - first_block); + nilfs_forget_buffer(bh); + } + still_dirty = PageDirty(page); + unlock_page(page); + put_page(page); + + if (still_dirty || + invalidate_inode_pages2_range(inode->i_mapping, index, index) != 0) + ret = -EBUSY; + return ret; +} + +int nilfs_mdt_fetch_dirty(struct inode *inode) +{ + struct nilfs_inode_info *ii = NILFS_I(inode); + + if (nilfs_bmap_test_and_clear_dirty(ii->i_bmap)) { + set_bit(NILFS_I_DIRTY, &ii->i_state); + return 1; + } + return test_bit(NILFS_I_DIRTY, &ii->i_state); +} + +static int +nilfs_mdt_write_page(struct page *page, struct writeback_control *wbc) +{ + struct inode *inode = page->mapping->host; + struct super_block *sb; + int err = 0; + + if (inode && sb_rdonly(inode->i_sb)) { + /* + * It means that filesystem was remounted in read-only + * mode because of error or metadata corruption. But we + * have dirty pages that try to be flushed in background. + * So, here we simply discard this dirty page. + */ + nilfs_clear_dirty_page(page, false); + unlock_page(page); + return -EROFS; + } + + redirty_page_for_writepage(wbc, page); + unlock_page(page); + + if (!inode) + return 0; + + sb = inode->i_sb; + + if (wbc->sync_mode == WB_SYNC_ALL) + err = nilfs_construct_segment(sb); + else if (wbc->for_reclaim) + nilfs_flush_segment(sb, inode->i_ino); + + return err; +} + + +static const struct address_space_operations def_mdt_aops = { + .dirty_folio = block_dirty_folio, + .invalidate_folio = block_invalidate_folio, + .writepage = nilfs_mdt_write_page, +}; + +static const struct inode_operations def_mdt_iops; +static const struct file_operations def_mdt_fops; + + +int nilfs_mdt_init(struct inode *inode, gfp_t gfp_mask, size_t objsz) +{ + struct nilfs_mdt_info *mi; + + mi = kzalloc(max(sizeof(*mi), objsz), GFP_NOFS); + if (!mi) + return -ENOMEM; + + init_rwsem(&mi->mi_sem); + inode->i_private = mi; + + inode->i_mode = S_IFREG; + mapping_set_gfp_mask(inode->i_mapping, gfp_mask); + + inode->i_op = &def_mdt_iops; + inode->i_fop = &def_mdt_fops; + inode->i_mapping->a_ops = &def_mdt_aops; + + return 0; +} + +/** + * nilfs_mdt_clear - do cleanup for the metadata file + * @inode: inode of the metadata file + */ +void nilfs_mdt_clear(struct inode *inode) +{ + struct nilfs_mdt_info *mdi = NILFS_MDT(inode); + struct nilfs_shadow_map *shadow = mdi->mi_shadow; + + if (mdi->mi_palloc_cache) + nilfs_palloc_destroy_cache(inode); + + if (shadow) { + struct inode *s_inode = shadow->inode; + + shadow->inode = NULL; + iput(s_inode); + mdi->mi_shadow = NULL; + } +} + +/** + * nilfs_mdt_destroy - release resources used by the metadata file + * @inode: inode of the metadata file + */ +void nilfs_mdt_destroy(struct inode *inode) +{ + struct nilfs_mdt_info *mdi = NILFS_MDT(inode); + + kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ + kfree(mdi); +} + +void nilfs_mdt_set_entry_size(struct inode *inode, unsigned int entry_size, + unsigned int header_size) +{ + struct nilfs_mdt_info *mi = NILFS_MDT(inode); + + mi->mi_entry_size = entry_size; + mi->mi_entries_per_block = i_blocksize(inode) / entry_size; + mi->mi_first_entry_offset = DIV_ROUND_UP(header_size, entry_size); +} + +/** + * nilfs_mdt_setup_shadow_map - setup shadow map and bind it to metadata file + * @inode: inode of the metadata file + * @shadow: shadow mapping + */ +int nilfs_mdt_setup_shadow_map(struct inode *inode, + struct nilfs_shadow_map *shadow) +{ + struct nilfs_mdt_info *mi = NILFS_MDT(inode); + struct inode *s_inode; + + INIT_LIST_HEAD(&shadow->frozen_buffers); + + s_inode = nilfs_iget_for_shadow(inode); + if (IS_ERR(s_inode)) + return PTR_ERR(s_inode); + + shadow->inode = s_inode; + mi->mi_shadow = shadow; + return 0; +} + +/** + * nilfs_mdt_save_to_shadow_map - copy bmap and dirty pages to shadow map + * @inode: inode of the metadata file + */ +int nilfs_mdt_save_to_shadow_map(struct inode *inode) +{ + struct nilfs_mdt_info *mi = NILFS_MDT(inode); + struct nilfs_inode_info *ii = NILFS_I(inode); + struct nilfs_shadow_map *shadow = mi->mi_shadow; + struct inode *s_inode = shadow->inode; + int ret; + + ret = nilfs_copy_dirty_pages(s_inode->i_mapping, inode->i_mapping); + if (ret) + goto out; + + ret = nilfs_copy_dirty_pages(NILFS_I(s_inode)->i_assoc_inode->i_mapping, + ii->i_assoc_inode->i_mapping); + if (ret) + goto out; + + nilfs_bmap_save(ii->i_bmap, &shadow->bmap_store); + out: + return ret; +} + +int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh) +{ + struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; + struct buffer_head *bh_frozen; + struct page *page; + int blkbits = inode->i_blkbits; + + page = grab_cache_page(shadow->inode->i_mapping, bh->b_page->index); + if (!page) + return -ENOMEM; + + if (!page_has_buffers(page)) + create_empty_buffers(page, 1 << blkbits, 0); + + bh_frozen = nilfs_page_get_nth_block(page, bh_offset(bh) >> blkbits); + + if (!buffer_uptodate(bh_frozen)) + nilfs_copy_buffer(bh_frozen, bh); + if (list_empty(&bh_frozen->b_assoc_buffers)) { + list_add_tail(&bh_frozen->b_assoc_buffers, + &shadow->frozen_buffers); + set_buffer_nilfs_redirected(bh); + } else { + brelse(bh_frozen); /* already frozen */ + } + + unlock_page(page); + put_page(page); + return 0; +} + +struct buffer_head * +nilfs_mdt_get_frozen_buffer(struct inode *inode, struct buffer_head *bh) +{ + struct nilfs_shadow_map *shadow = NILFS_MDT(inode)->mi_shadow; + struct buffer_head *bh_frozen = NULL; + struct page *page; + int n; + + page = find_lock_page(shadow->inode->i_mapping, bh->b_page->index); + if (page) { + if (page_has_buffers(page)) { + n = bh_offset(bh) >> inode->i_blkbits; + bh_frozen = nilfs_page_get_nth_block(page, n); + } + unlock_page(page); + put_page(page); + } + return bh_frozen; +} + +static void nilfs_release_frozen_buffers(struct nilfs_shadow_map *shadow) +{ + struct list_head *head = &shadow->frozen_buffers; + struct buffer_head *bh; + + while (!list_empty(head)) { + bh = list_first_entry(head, struct buffer_head, + b_assoc_buffers); + list_del_init(&bh->b_assoc_buffers); + brelse(bh); /* drop ref-count to make it releasable */ + } +} + +/** + * nilfs_mdt_restore_from_shadow_map - restore dirty pages and bmap state + * @inode: inode of the metadata file + */ +void nilfs_mdt_restore_from_shadow_map(struct inode *inode) +{ + struct nilfs_mdt_info *mi = NILFS_MDT(inode); + struct nilfs_inode_info *ii = NILFS_I(inode); + struct nilfs_shadow_map *shadow = mi->mi_shadow; + + down_write(&mi->mi_sem); + + if (mi->mi_palloc_cache) + nilfs_palloc_clear_cache(inode); + + nilfs_clear_dirty_pages(inode->i_mapping, true); + nilfs_copy_back_pages(inode->i_mapping, shadow->inode->i_mapping); + + nilfs_clear_dirty_pages(ii->i_assoc_inode->i_mapping, true); + nilfs_copy_back_pages(ii->i_assoc_inode->i_mapping, + NILFS_I(shadow->inode)->i_assoc_inode->i_mapping); + + nilfs_bmap_restore(ii->i_bmap, &shadow->bmap_store); + + up_write(&mi->mi_sem); +} + +/** + * nilfs_mdt_clear_shadow_map - truncate pages in shadow map caches + * @inode: inode of the metadata file + */ +void nilfs_mdt_clear_shadow_map(struct inode *inode) +{ + struct nilfs_mdt_info *mi = NILFS_MDT(inode); + struct nilfs_shadow_map *shadow = mi->mi_shadow; + struct inode *shadow_btnc_inode = NILFS_I(shadow->inode)->i_assoc_inode; + + down_write(&mi->mi_sem); + nilfs_release_frozen_buffers(shadow); + truncate_inode_pages(shadow->inode->i_mapping, 0); + truncate_inode_pages(shadow_btnc_inode->i_mapping, 0); + up_write(&mi->mi_sem); +} |