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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/xfs/libxfs/xfs_dir2_data.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 '')
-rw-r--r-- | fs/xfs/libxfs/xfs_dir2_data.c | 1223 |
1 files changed, 1223 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_dir2_data.c b/fs/xfs/libxfs/xfs_dir2_data.c new file mode 100644 index 000000000..dbcf58979 --- /dev/null +++ b/fs/xfs/libxfs/xfs_dir2_data.c @@ -0,0 +1,1223 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc. + * Copyright (c) 2013 Red Hat, Inc. + * All Rights Reserved. + */ +#include "xfs.h" +#include "xfs_fs.h" +#include "xfs_shared.h" +#include "xfs_format.h" +#include "xfs_log_format.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_inode.h" +#include "xfs_dir2.h" +#include "xfs_dir2_priv.h" +#include "xfs_error.h" +#include "xfs_trans.h" +#include "xfs_buf_item.h" +#include "xfs_log.h" + +static xfs_failaddr_t xfs_dir2_data_freefind_verify( + struct xfs_dir2_data_hdr *hdr, struct xfs_dir2_data_free *bf, + struct xfs_dir2_data_unused *dup, + struct xfs_dir2_data_free **bf_ent); + +struct xfs_dir2_data_free * +xfs_dir2_data_bestfree_p( + struct xfs_mount *mp, + struct xfs_dir2_data_hdr *hdr) +{ + if (xfs_has_crc(mp)) + return ((struct xfs_dir3_data_hdr *)hdr)->best_free; + return hdr->bestfree; +} + +/* + * Pointer to an entry's tag word. + */ +__be16 * +xfs_dir2_data_entry_tag_p( + struct xfs_mount *mp, + struct xfs_dir2_data_entry *dep) +{ + return (__be16 *)((char *)dep + + xfs_dir2_data_entsize(mp, dep->namelen) - sizeof(__be16)); +} + +uint8_t +xfs_dir2_data_get_ftype( + struct xfs_mount *mp, + struct xfs_dir2_data_entry *dep) +{ + if (xfs_has_ftype(mp)) { + uint8_t ftype = dep->name[dep->namelen]; + + if (likely(ftype < XFS_DIR3_FT_MAX)) + return ftype; + } + + return XFS_DIR3_FT_UNKNOWN; +} + +void +xfs_dir2_data_put_ftype( + struct xfs_mount *mp, + struct xfs_dir2_data_entry *dep, + uint8_t ftype) +{ + ASSERT(ftype < XFS_DIR3_FT_MAX); + ASSERT(dep->namelen != 0); + + if (xfs_has_ftype(mp)) + dep->name[dep->namelen] = ftype; +} + +/* + * The number of leaf entries is limited by the size of the block and the amount + * of space used by the data entries. We don't know how much space is used by + * the data entries yet, so just ensure that the count falls somewhere inside + * the block right now. + */ +static inline unsigned int +xfs_dir2_data_max_leaf_entries( + struct xfs_da_geometry *geo) +{ + return (geo->blksize - sizeof(struct xfs_dir2_block_tail) - + geo->data_entry_offset) / + sizeof(struct xfs_dir2_leaf_entry); +} + +/* + * Check the consistency of the data block. + * The input can also be a block-format directory. + * Return NULL if the buffer is good, otherwise the address of the error. + */ +xfs_failaddr_t +__xfs_dir3_data_check( + struct xfs_inode *dp, /* incore inode pointer */ + struct xfs_buf *bp) /* data block's buffer */ +{ + xfs_dir2_dataptr_t addr; /* addr for leaf lookup */ + xfs_dir2_data_free_t *bf; /* bestfree table */ + xfs_dir2_block_tail_t *btp=NULL; /* block tail */ + int count; /* count of entries found */ + xfs_dir2_data_hdr_t *hdr; /* data block header */ + xfs_dir2_data_free_t *dfp; /* bestfree entry */ + int freeseen; /* mask of bestfrees seen */ + xfs_dahash_t hash; /* hash of current name */ + int i; /* leaf index */ + int lastfree; /* last entry was unused */ + xfs_dir2_leaf_entry_t *lep=NULL; /* block leaf entries */ + struct xfs_mount *mp = bp->b_mount; + int stale; /* count of stale leaves */ + struct xfs_name name; + unsigned int offset; + unsigned int end; + struct xfs_da_geometry *geo = mp->m_dir_geo; + + /* + * If this isn't a directory, something is seriously wrong. Bail out. + */ + if (dp && !S_ISDIR(VFS_I(dp)->i_mode)) + return __this_address; + + hdr = bp->b_addr; + offset = geo->data_entry_offset; + + switch (hdr->magic) { + case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC): + case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC): + btp = xfs_dir2_block_tail_p(geo, hdr); + lep = xfs_dir2_block_leaf_p(btp); + + if (be32_to_cpu(btp->count) >= + xfs_dir2_data_max_leaf_entries(geo)) + return __this_address; + break; + case cpu_to_be32(XFS_DIR3_DATA_MAGIC): + case cpu_to_be32(XFS_DIR2_DATA_MAGIC): + break; + default: + return __this_address; + } + end = xfs_dir3_data_end_offset(geo, hdr); + if (!end) + return __this_address; + + /* + * Account for zero bestfree entries. + */ + bf = xfs_dir2_data_bestfree_p(mp, hdr); + count = lastfree = freeseen = 0; + if (!bf[0].length) { + if (bf[0].offset) + return __this_address; + freeseen |= 1 << 0; + } + if (!bf[1].length) { + if (bf[1].offset) + return __this_address; + freeseen |= 1 << 1; + } + if (!bf[2].length) { + if (bf[2].offset) + return __this_address; + freeseen |= 1 << 2; + } + + if (be16_to_cpu(bf[0].length) < be16_to_cpu(bf[1].length)) + return __this_address; + if (be16_to_cpu(bf[1].length) < be16_to_cpu(bf[2].length)) + return __this_address; + /* + * Loop over the data/unused entries. + */ + while (offset < end) { + struct xfs_dir2_data_unused *dup = bp->b_addr + offset; + struct xfs_dir2_data_entry *dep = bp->b_addr + offset; + + /* + * If it's unused, look for the space in the bestfree table. + * If we find it, account for that, else make sure it + * doesn't need to be there. + */ + if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { + xfs_failaddr_t fa; + + if (lastfree != 0) + return __this_address; + if (offset + be16_to_cpu(dup->length) > end) + return __this_address; + if (be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup)) != + offset) + return __this_address; + fa = xfs_dir2_data_freefind_verify(hdr, bf, dup, &dfp); + if (fa) + return fa; + if (dfp) { + i = (int)(dfp - bf); + if ((freeseen & (1 << i)) != 0) + return __this_address; + freeseen |= 1 << i; + } else { + if (be16_to_cpu(dup->length) > + be16_to_cpu(bf[2].length)) + return __this_address; + } + offset += be16_to_cpu(dup->length); + lastfree = 1; + continue; + } + /* + * It's a real entry. Validate the fields. + * If this is a block directory then make sure it's + * in the leaf section of the block. + * The linear search is crude but this is DEBUG code. + */ + if (dep->namelen == 0) + return __this_address; + if (!xfs_verify_dir_ino(mp, be64_to_cpu(dep->inumber))) + return __this_address; + if (offset + xfs_dir2_data_entsize(mp, dep->namelen) > end) + return __this_address; + if (be16_to_cpu(*xfs_dir2_data_entry_tag_p(mp, dep)) != offset) + return __this_address; + if (xfs_dir2_data_get_ftype(mp, dep) >= XFS_DIR3_FT_MAX) + return __this_address; + count++; + lastfree = 0; + if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { + addr = xfs_dir2_db_off_to_dataptr(geo, geo->datablk, + (xfs_dir2_data_aoff_t) + ((char *)dep - (char *)hdr)); + name.name = dep->name; + name.len = dep->namelen; + hash = xfs_dir2_hashname(mp, &name); + for (i = 0; i < be32_to_cpu(btp->count); i++) { + if (be32_to_cpu(lep[i].address) == addr && + be32_to_cpu(lep[i].hashval) == hash) + break; + } + if (i >= be32_to_cpu(btp->count)) + return __this_address; + } + offset += xfs_dir2_data_entsize(mp, dep->namelen); + } + /* + * Need to have seen all the entries and all the bestfree slots. + */ + if (freeseen != 7) + return __this_address; + if (hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) { + for (i = stale = 0; i < be32_to_cpu(btp->count); i++) { + if (lep[i].address == + cpu_to_be32(XFS_DIR2_NULL_DATAPTR)) + stale++; + if (i > 0 && be32_to_cpu(lep[i].hashval) < + be32_to_cpu(lep[i - 1].hashval)) + return __this_address; + } + if (count != be32_to_cpu(btp->count) - be32_to_cpu(btp->stale)) + return __this_address; + if (stale != be32_to_cpu(btp->stale)) + return __this_address; + } + return NULL; +} + +#ifdef DEBUG +void +xfs_dir3_data_check( + struct xfs_inode *dp, + struct xfs_buf *bp) +{ + xfs_failaddr_t fa; + + fa = __xfs_dir3_data_check(dp, bp); + if (!fa) + return; + xfs_corruption_error(__func__, XFS_ERRLEVEL_LOW, dp->i_mount, + bp->b_addr, BBTOB(bp->b_length), __FILE__, __LINE__, + fa); + ASSERT(0); +} +#endif + +static xfs_failaddr_t +xfs_dir3_data_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_mount; + struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; + + if (!xfs_verify_magic(bp, hdr3->magic)) + return __this_address; + + if (xfs_has_crc(mp)) { + if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid)) + return __this_address; + if (be64_to_cpu(hdr3->blkno) != xfs_buf_daddr(bp)) + return __this_address; + if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn))) + return __this_address; + } + return __xfs_dir3_data_check(NULL, bp); +} + +/* + * Readahead of the first block of the directory when it is opened is completely + * oblivious to the format of the directory. Hence we can either get a block + * format buffer or a data format buffer on readahead. + */ +static void +xfs_dir3_data_reada_verify( + struct xfs_buf *bp) +{ + struct xfs_dir2_data_hdr *hdr = bp->b_addr; + + switch (hdr->magic) { + case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC): + case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC): + bp->b_ops = &xfs_dir3_block_buf_ops; + bp->b_ops->verify_read(bp); + return; + case cpu_to_be32(XFS_DIR2_DATA_MAGIC): + case cpu_to_be32(XFS_DIR3_DATA_MAGIC): + bp->b_ops = &xfs_dir3_data_buf_ops; + bp->b_ops->verify_read(bp); + return; + default: + xfs_verifier_error(bp, -EFSCORRUPTED, __this_address); + break; + } +} + +static void +xfs_dir3_data_read_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_mount; + xfs_failaddr_t fa; + + if (xfs_has_crc(mp) && + !xfs_buf_verify_cksum(bp, XFS_DIR3_DATA_CRC_OFF)) + xfs_verifier_error(bp, -EFSBADCRC, __this_address); + else { + fa = xfs_dir3_data_verify(bp); + if (fa) + xfs_verifier_error(bp, -EFSCORRUPTED, fa); + } +} + +static void +xfs_dir3_data_write_verify( + struct xfs_buf *bp) +{ + struct xfs_mount *mp = bp->b_mount; + struct xfs_buf_log_item *bip = bp->b_log_item; + struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; + xfs_failaddr_t fa; + + fa = xfs_dir3_data_verify(bp); + if (fa) { + xfs_verifier_error(bp, -EFSCORRUPTED, fa); + return; + } + + if (!xfs_has_crc(mp)) + return; + + if (bip) + hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn); + + xfs_buf_update_cksum(bp, XFS_DIR3_DATA_CRC_OFF); +} + +const struct xfs_buf_ops xfs_dir3_data_buf_ops = { + .name = "xfs_dir3_data", + .magic = { cpu_to_be32(XFS_DIR2_DATA_MAGIC), + cpu_to_be32(XFS_DIR3_DATA_MAGIC) }, + .verify_read = xfs_dir3_data_read_verify, + .verify_write = xfs_dir3_data_write_verify, + .verify_struct = xfs_dir3_data_verify, +}; + +static const struct xfs_buf_ops xfs_dir3_data_reada_buf_ops = { + .name = "xfs_dir3_data_reada", + .magic = { cpu_to_be32(XFS_DIR2_DATA_MAGIC), + cpu_to_be32(XFS_DIR3_DATA_MAGIC) }, + .verify_read = xfs_dir3_data_reada_verify, + .verify_write = xfs_dir3_data_write_verify, +}; + +static xfs_failaddr_t +xfs_dir3_data_header_check( + struct xfs_inode *dp, + struct xfs_buf *bp) +{ + struct xfs_mount *mp = dp->i_mount; + + if (xfs_has_crc(mp)) { + struct xfs_dir3_data_hdr *hdr3 = bp->b_addr; + + if (be64_to_cpu(hdr3->hdr.owner) != dp->i_ino) + return __this_address; + } + + return NULL; +} + +int +xfs_dir3_data_read( + struct xfs_trans *tp, + struct xfs_inode *dp, + xfs_dablk_t bno, + unsigned int flags, + struct xfs_buf **bpp) +{ + xfs_failaddr_t fa; + int err; + + err = xfs_da_read_buf(tp, dp, bno, flags, bpp, XFS_DATA_FORK, + &xfs_dir3_data_buf_ops); + if (err || !*bpp) + return err; + + /* Check things that we can't do in the verifier. */ + fa = xfs_dir3_data_header_check(dp, *bpp); + if (fa) { + __xfs_buf_mark_corrupt(*bpp, fa); + xfs_trans_brelse(tp, *bpp); + *bpp = NULL; + return -EFSCORRUPTED; + } + + xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_DATA_BUF); + return err; +} + +int +xfs_dir3_data_readahead( + struct xfs_inode *dp, + xfs_dablk_t bno, + unsigned int flags) +{ + return xfs_da_reada_buf(dp, bno, flags, XFS_DATA_FORK, + &xfs_dir3_data_reada_buf_ops); +} + +/* + * Find the bestfree entry that exactly coincides with unused directory space + * or a verifier error because the bestfree data are bad. + */ +static xfs_failaddr_t +xfs_dir2_data_freefind_verify( + struct xfs_dir2_data_hdr *hdr, + struct xfs_dir2_data_free *bf, + struct xfs_dir2_data_unused *dup, + struct xfs_dir2_data_free **bf_ent) +{ + struct xfs_dir2_data_free *dfp; + xfs_dir2_data_aoff_t off; + bool matched = false; + bool seenzero = false; + + *bf_ent = NULL; + off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr); + + /* + * Validate some consistency in the bestfree table. + * Check order, non-overlapping entries, and if we find the + * one we're looking for it has to be exact. + */ + for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) { + if (!dfp->offset) { + if (dfp->length) + return __this_address; + seenzero = true; + continue; + } + if (seenzero) + return __this_address; + if (be16_to_cpu(dfp->offset) == off) { + matched = true; + if (dfp->length != dup->length) + return __this_address; + } else if (be16_to_cpu(dfp->offset) > off) { + if (off + be16_to_cpu(dup->length) > + be16_to_cpu(dfp->offset)) + return __this_address; + } else { + if (be16_to_cpu(dfp->offset) + + be16_to_cpu(dfp->length) > off) + return __this_address; + } + if (!matched && + be16_to_cpu(dfp->length) < be16_to_cpu(dup->length)) + return __this_address; + if (dfp > &bf[0] && + be16_to_cpu(dfp[-1].length) < be16_to_cpu(dfp[0].length)) + return __this_address; + } + + /* Looks ok so far; now try to match up with a bestfree entry. */ + *bf_ent = xfs_dir2_data_freefind(hdr, bf, dup); + return NULL; +} + +/* + * Given a data block and an unused entry from that block, + * return the bestfree entry if any that corresponds to it. + */ +xfs_dir2_data_free_t * +xfs_dir2_data_freefind( + struct xfs_dir2_data_hdr *hdr, /* data block header */ + struct xfs_dir2_data_free *bf, /* bestfree table pointer */ + struct xfs_dir2_data_unused *dup) /* unused space */ +{ + xfs_dir2_data_free_t *dfp; /* bestfree entry */ + xfs_dir2_data_aoff_t off; /* offset value needed */ + + off = (xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr); + + /* + * If this is smaller than the smallest bestfree entry, + * it can't be there since they're sorted. + */ + if (be16_to_cpu(dup->length) < + be16_to_cpu(bf[XFS_DIR2_DATA_FD_COUNT - 1].length)) + return NULL; + /* + * Look at the three bestfree entries for our guy. + */ + for (dfp = &bf[0]; dfp < &bf[XFS_DIR2_DATA_FD_COUNT]; dfp++) { + if (!dfp->offset) + return NULL; + if (be16_to_cpu(dfp->offset) == off) + return dfp; + } + /* + * Didn't find it. This only happens if there are duplicate lengths. + */ + return NULL; +} + +/* + * Insert an unused-space entry into the bestfree table. + */ +xfs_dir2_data_free_t * /* entry inserted */ +xfs_dir2_data_freeinsert( + struct xfs_dir2_data_hdr *hdr, /* data block pointer */ + struct xfs_dir2_data_free *dfp, /* bestfree table pointer */ + struct xfs_dir2_data_unused *dup, /* unused space */ + int *loghead) /* log the data header (out) */ +{ + xfs_dir2_data_free_t new; /* new bestfree entry */ + + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); + + new.length = dup->length; + new.offset = cpu_to_be16((char *)dup - (char *)hdr); + + /* + * Insert at position 0, 1, or 2; or not at all. + */ + if (be16_to_cpu(new.length) > be16_to_cpu(dfp[0].length)) { + dfp[2] = dfp[1]; + dfp[1] = dfp[0]; + dfp[0] = new; + *loghead = 1; + return &dfp[0]; + } + if (be16_to_cpu(new.length) > be16_to_cpu(dfp[1].length)) { + dfp[2] = dfp[1]; + dfp[1] = new; + *loghead = 1; + return &dfp[1]; + } + if (be16_to_cpu(new.length) > be16_to_cpu(dfp[2].length)) { + dfp[2] = new; + *loghead = 1; + return &dfp[2]; + } + return NULL; +} + +/* + * Remove a bestfree entry from the table. + */ +STATIC void +xfs_dir2_data_freeremove( + struct xfs_dir2_data_hdr *hdr, /* data block header */ + struct xfs_dir2_data_free *bf, /* bestfree table pointer */ + struct xfs_dir2_data_free *dfp, /* bestfree entry pointer */ + int *loghead) /* out: log data header */ +{ + + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); + + /* + * It's the first entry, slide the next 2 up. + */ + if (dfp == &bf[0]) { + bf[0] = bf[1]; + bf[1] = bf[2]; + } + /* + * It's the second entry, slide the 3rd entry up. + */ + else if (dfp == &bf[1]) + bf[1] = bf[2]; + /* + * Must be the last entry. + */ + else + ASSERT(dfp == &bf[2]); + /* + * Clear the 3rd entry, must be zero now. + */ + bf[2].length = 0; + bf[2].offset = 0; + *loghead = 1; +} + +/* + * Given a data block, reconstruct its bestfree map. + */ +void +xfs_dir2_data_freescan( + struct xfs_mount *mp, + struct xfs_dir2_data_hdr *hdr, + int *loghead) +{ + struct xfs_da_geometry *geo = mp->m_dir_geo; + struct xfs_dir2_data_free *bf = xfs_dir2_data_bestfree_p(mp, hdr); + void *addr = hdr; + unsigned int offset = geo->data_entry_offset; + unsigned int end; + + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); + + /* + * Start by clearing the table. + */ + memset(bf, 0, sizeof(*bf) * XFS_DIR2_DATA_FD_COUNT); + *loghead = 1; + + end = xfs_dir3_data_end_offset(geo, addr); + while (offset < end) { + struct xfs_dir2_data_unused *dup = addr + offset; + struct xfs_dir2_data_entry *dep = addr + offset; + + /* + * If it's a free entry, insert it. + */ + if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) { + ASSERT(offset == + be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup))); + xfs_dir2_data_freeinsert(hdr, bf, dup, loghead); + offset += be16_to_cpu(dup->length); + continue; + } + + /* + * For active entries, check their tags and skip them. + */ + ASSERT(offset == + be16_to_cpu(*xfs_dir2_data_entry_tag_p(mp, dep))); + offset += xfs_dir2_data_entsize(mp, dep->namelen); + } +} + +/* + * Initialize a data block at the given block number in the directory. + * Give back the buffer for the created block. + */ +int /* error */ +xfs_dir3_data_init( + struct xfs_da_args *args, /* directory operation args */ + xfs_dir2_db_t blkno, /* logical dir block number */ + struct xfs_buf **bpp) /* output block buffer */ +{ + struct xfs_trans *tp = args->trans; + struct xfs_inode *dp = args->dp; + struct xfs_mount *mp = dp->i_mount; + struct xfs_da_geometry *geo = args->geo; + struct xfs_buf *bp; + struct xfs_dir2_data_hdr *hdr; + struct xfs_dir2_data_unused *dup; + struct xfs_dir2_data_free *bf; + int error; + int i; + + /* + * Get the buffer set up for the block. + */ + error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, blkno), + &bp, XFS_DATA_FORK); + if (error) + return error; + bp->b_ops = &xfs_dir3_data_buf_ops; + xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_DATA_BUF); + + /* + * Initialize the header. + */ + hdr = bp->b_addr; + if (xfs_has_crc(mp)) { + struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr; + + memset(hdr3, 0, sizeof(*hdr3)); + hdr3->magic = cpu_to_be32(XFS_DIR3_DATA_MAGIC); + hdr3->blkno = cpu_to_be64(xfs_buf_daddr(bp)); + hdr3->owner = cpu_to_be64(dp->i_ino); + uuid_copy(&hdr3->uuid, &mp->m_sb.sb_meta_uuid); + + } else + hdr->magic = cpu_to_be32(XFS_DIR2_DATA_MAGIC); + + bf = xfs_dir2_data_bestfree_p(mp, hdr); + bf[0].offset = cpu_to_be16(geo->data_entry_offset); + bf[0].length = cpu_to_be16(geo->blksize - geo->data_entry_offset); + for (i = 1; i < XFS_DIR2_DATA_FD_COUNT; i++) { + bf[i].length = 0; + bf[i].offset = 0; + } + + /* + * Set up an unused entry for the block's body. + */ + dup = bp->b_addr + geo->data_entry_offset; + dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); + dup->length = bf[0].length; + *xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16((char *)dup - (char *)hdr); + + /* + * Log it and return it. + */ + xfs_dir2_data_log_header(args, bp); + xfs_dir2_data_log_unused(args, bp, dup); + *bpp = bp; + return 0; +} + +/* + * Log an active data entry from the block. + */ +void +xfs_dir2_data_log_entry( + struct xfs_da_args *args, + struct xfs_buf *bp, + xfs_dir2_data_entry_t *dep) /* data entry pointer */ +{ + struct xfs_mount *mp = bp->b_mount; + struct xfs_dir2_data_hdr *hdr = bp->b_addr; + + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); + + xfs_trans_log_buf(args->trans, bp, (uint)((char *)dep - (char *)hdr), + (uint)((char *)(xfs_dir2_data_entry_tag_p(mp, dep) + 1) - + (char *)hdr - 1)); +} + +/* + * Log a data block header. + */ +void +xfs_dir2_data_log_header( + struct xfs_da_args *args, + struct xfs_buf *bp) +{ +#ifdef DEBUG + struct xfs_dir2_data_hdr *hdr = bp->b_addr; + + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); +#endif + + xfs_trans_log_buf(args->trans, bp, 0, args->geo->data_entry_offset - 1); +} + +/* + * Log a data unused entry. + */ +void +xfs_dir2_data_log_unused( + struct xfs_da_args *args, + struct xfs_buf *bp, + xfs_dir2_data_unused_t *dup) /* data unused pointer */ +{ + xfs_dir2_data_hdr_t *hdr = bp->b_addr; + + ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) || + hdr->magic == cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)); + + /* + * Log the first part of the unused entry. + */ + xfs_trans_log_buf(args->trans, bp, (uint)((char *)dup - (char *)hdr), + (uint)((char *)&dup->length + sizeof(dup->length) - + 1 - (char *)hdr)); + /* + * Log the end (tag) of the unused entry. + */ + xfs_trans_log_buf(args->trans, bp, + (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr), + (uint)((char *)xfs_dir2_data_unused_tag_p(dup) - (char *)hdr + + sizeof(xfs_dir2_data_off_t) - 1)); +} + +/* + * Make a byte range in the data block unused. + * Its current contents are unimportant. + */ +void +xfs_dir2_data_make_free( + struct xfs_da_args *args, + struct xfs_buf *bp, + xfs_dir2_data_aoff_t offset, /* starting byte offset */ + xfs_dir2_data_aoff_t len, /* length in bytes */ + int *needlogp, /* out: log header */ + int *needscanp) /* out: regen bestfree */ +{ + xfs_dir2_data_hdr_t *hdr; /* data block pointer */ + xfs_dir2_data_free_t *dfp; /* bestfree pointer */ + int needscan; /* need to regen bestfree */ + xfs_dir2_data_unused_t *newdup; /* new unused entry */ + xfs_dir2_data_unused_t *postdup; /* unused entry after us */ + xfs_dir2_data_unused_t *prevdup; /* unused entry before us */ + unsigned int end; + struct xfs_dir2_data_free *bf; + + hdr = bp->b_addr; + + /* + * Figure out where the end of the data area is. + */ + end = xfs_dir3_data_end_offset(args->geo, hdr); + ASSERT(end != 0); + + /* + * If this isn't the start of the block, then back up to + * the previous entry and see if it's free. + */ + if (offset > args->geo->data_entry_offset) { + __be16 *tagp; /* tag just before us */ + + tagp = (__be16 *)((char *)hdr + offset) - 1; + prevdup = (xfs_dir2_data_unused_t *)((char *)hdr + be16_to_cpu(*tagp)); + if (be16_to_cpu(prevdup->freetag) != XFS_DIR2_DATA_FREE_TAG) + prevdup = NULL; + } else + prevdup = NULL; + /* + * If this isn't the end of the block, see if the entry after + * us is free. + */ + if (offset + len < end) { + postdup = + (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); + if (be16_to_cpu(postdup->freetag) != XFS_DIR2_DATA_FREE_TAG) + postdup = NULL; + } else + postdup = NULL; + ASSERT(*needscanp == 0); + needscan = 0; + /* + * Previous and following entries are both free, + * merge everything into a single free entry. + */ + bf = xfs_dir2_data_bestfree_p(args->dp->i_mount, hdr); + if (prevdup && postdup) { + xfs_dir2_data_free_t *dfp2; /* another bestfree pointer */ + + /* + * See if prevdup and/or postdup are in bestfree table. + */ + dfp = xfs_dir2_data_freefind(hdr, bf, prevdup); + dfp2 = xfs_dir2_data_freefind(hdr, bf, postdup); + /* + * We need a rescan unless there are exactly 2 free entries + * namely our two. Then we know what's happening, otherwise + * since the third bestfree is there, there might be more + * entries. + */ + needscan = (bf[2].length != 0); + /* + * Fix up the new big freespace. + */ + be16_add_cpu(&prevdup->length, len + be16_to_cpu(postdup->length)); + *xfs_dir2_data_unused_tag_p(prevdup) = + cpu_to_be16((char *)prevdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, prevdup); + if (!needscan) { + /* + * Has to be the case that entries 0 and 1 are + * dfp and dfp2 (don't know which is which), and + * entry 2 is empty. + * Remove entry 1 first then entry 0. + */ + ASSERT(dfp && dfp2); + if (dfp == &bf[1]) { + dfp = &bf[0]; + ASSERT(dfp2 == dfp); + dfp2 = &bf[1]; + } + xfs_dir2_data_freeremove(hdr, bf, dfp2, needlogp); + xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); + /* + * Now insert the new entry. + */ + dfp = xfs_dir2_data_freeinsert(hdr, bf, prevdup, + needlogp); + ASSERT(dfp == &bf[0]); + ASSERT(dfp->length == prevdup->length); + ASSERT(!dfp[1].length); + ASSERT(!dfp[2].length); + } + } + /* + * The entry before us is free, merge with it. + */ + else if (prevdup) { + dfp = xfs_dir2_data_freefind(hdr, bf, prevdup); + be16_add_cpu(&prevdup->length, len); + *xfs_dir2_data_unused_tag_p(prevdup) = + cpu_to_be16((char *)prevdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, prevdup); + /* + * If the previous entry was in the table, the new entry + * is longer, so it will be in the table too. Remove + * the old one and add the new one. + */ + if (dfp) { + xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); + xfs_dir2_data_freeinsert(hdr, bf, prevdup, needlogp); + } + /* + * Otherwise we need a scan if the new entry is big enough. + */ + else { + needscan = be16_to_cpu(prevdup->length) > + be16_to_cpu(bf[2].length); + } + } + /* + * The following entry is free, merge with it. + */ + else if (postdup) { + dfp = xfs_dir2_data_freefind(hdr, bf, postdup); + newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); + newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); + newdup->length = cpu_to_be16(len + be16_to_cpu(postdup->length)); + *xfs_dir2_data_unused_tag_p(newdup) = + cpu_to_be16((char *)newdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, newdup); + /* + * If the following entry was in the table, the new entry + * is longer, so it will be in the table too. Remove + * the old one and add the new one. + */ + if (dfp) { + xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); + xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp); + } + /* + * Otherwise we need a scan if the new entry is big enough. + */ + else { + needscan = be16_to_cpu(newdup->length) > + be16_to_cpu(bf[2].length); + } + } + /* + * Neither neighbor is free. Make a new entry. + */ + else { + newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset); + newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); + newdup->length = cpu_to_be16(len); + *xfs_dir2_data_unused_tag_p(newdup) = + cpu_to_be16((char *)newdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, newdup); + xfs_dir2_data_freeinsert(hdr, bf, newdup, needlogp); + } + *needscanp = needscan; +} + +/* Check our free data for obvious signs of corruption. */ +static inline xfs_failaddr_t +xfs_dir2_data_check_free( + struct xfs_dir2_data_hdr *hdr, + struct xfs_dir2_data_unused *dup, + xfs_dir2_data_aoff_t offset, + xfs_dir2_data_aoff_t len) +{ + if (hdr->magic != cpu_to_be32(XFS_DIR2_DATA_MAGIC) && + hdr->magic != cpu_to_be32(XFS_DIR3_DATA_MAGIC) && + hdr->magic != cpu_to_be32(XFS_DIR2_BLOCK_MAGIC) && + hdr->magic != cpu_to_be32(XFS_DIR3_BLOCK_MAGIC)) + return __this_address; + if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG) + return __this_address; + if (offset < (char *)dup - (char *)hdr) + return __this_address; + if (offset + len > (char *)dup + be16_to_cpu(dup->length) - (char *)hdr) + return __this_address; + if ((char *)dup - (char *)hdr != + be16_to_cpu(*xfs_dir2_data_unused_tag_p(dup))) + return __this_address; + return NULL; +} + +/* Sanity-check a new bestfree entry. */ +static inline xfs_failaddr_t +xfs_dir2_data_check_new_free( + struct xfs_dir2_data_hdr *hdr, + struct xfs_dir2_data_free *dfp, + struct xfs_dir2_data_unused *newdup) +{ + if (dfp == NULL) + return __this_address; + if (dfp->length != newdup->length) + return __this_address; + if (be16_to_cpu(dfp->offset) != (char *)newdup - (char *)hdr) + return __this_address; + return NULL; +} + +/* + * Take a byte range out of an existing unused space and make it un-free. + */ +int +xfs_dir2_data_use_free( + struct xfs_da_args *args, + struct xfs_buf *bp, + xfs_dir2_data_unused_t *dup, /* unused entry */ + xfs_dir2_data_aoff_t offset, /* starting offset to use */ + xfs_dir2_data_aoff_t len, /* length to use */ + int *needlogp, /* out: need to log header */ + int *needscanp) /* out: need regen bestfree */ +{ + xfs_dir2_data_hdr_t *hdr; /* data block header */ + xfs_dir2_data_free_t *dfp; /* bestfree pointer */ + xfs_dir2_data_unused_t *newdup; /* new unused entry */ + xfs_dir2_data_unused_t *newdup2; /* another new unused entry */ + struct xfs_dir2_data_free *bf; + xfs_failaddr_t fa; + int matchback; /* matches end of freespace */ + int matchfront; /* matches start of freespace */ + int needscan; /* need to regen bestfree */ + int oldlen; /* old unused entry's length */ + + hdr = bp->b_addr; + fa = xfs_dir2_data_check_free(hdr, dup, offset, len); + if (fa) + goto corrupt; + /* + * Look up the entry in the bestfree table. + */ + oldlen = be16_to_cpu(dup->length); + bf = xfs_dir2_data_bestfree_p(args->dp->i_mount, hdr); + dfp = xfs_dir2_data_freefind(hdr, bf, dup); + ASSERT(dfp || oldlen <= be16_to_cpu(bf[2].length)); + /* + * Check for alignment with front and back of the entry. + */ + matchfront = (char *)dup - (char *)hdr == offset; + matchback = (char *)dup + oldlen - (char *)hdr == offset + len; + ASSERT(*needscanp == 0); + needscan = 0; + /* + * If we matched it exactly we just need to get rid of it from + * the bestfree table. + */ + if (matchfront && matchback) { + if (dfp) { + needscan = (bf[2].offset != 0); + if (!needscan) + xfs_dir2_data_freeremove(hdr, bf, dfp, + needlogp); + } + } + /* + * We match the first part of the entry. + * Make a new entry with the remaining freespace. + */ + else if (matchfront) { + newdup = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); + newdup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); + newdup->length = cpu_to_be16(oldlen - len); + *xfs_dir2_data_unused_tag_p(newdup) = + cpu_to_be16((char *)newdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, newdup); + /* + * If it was in the table, remove it and add the new one. + */ + if (dfp) { + xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); + dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup, + needlogp); + fa = xfs_dir2_data_check_new_free(hdr, dfp, newdup); + if (fa) + goto corrupt; + /* + * If we got inserted at the last slot, + * that means we don't know if there was a better + * choice for the last slot, or not. Rescan. + */ + needscan = dfp == &bf[2]; + } + } + /* + * We match the last part of the entry. + * Trim the allocated space off the tail of the entry. + */ + else if (matchback) { + newdup = dup; + newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup); + *xfs_dir2_data_unused_tag_p(newdup) = + cpu_to_be16((char *)newdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, newdup); + /* + * If it was in the table, remove it and add the new one. + */ + if (dfp) { + xfs_dir2_data_freeremove(hdr, bf, dfp, needlogp); + dfp = xfs_dir2_data_freeinsert(hdr, bf, newdup, + needlogp); + fa = xfs_dir2_data_check_new_free(hdr, dfp, newdup); + if (fa) + goto corrupt; + /* + * If we got inserted at the last slot, + * that means we don't know if there was a better + * choice for the last slot, or not. Rescan. + */ + needscan = dfp == &bf[2]; + } + } + /* + * Poking out the middle of an entry. + * Make two new entries. + */ + else { + newdup = dup; + newdup->length = cpu_to_be16(((char *)hdr + offset) - (char *)newdup); + *xfs_dir2_data_unused_tag_p(newdup) = + cpu_to_be16((char *)newdup - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, newdup); + newdup2 = (xfs_dir2_data_unused_t *)((char *)hdr + offset + len); + newdup2->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG); + newdup2->length = cpu_to_be16(oldlen - len - be16_to_cpu(newdup->length)); + *xfs_dir2_data_unused_tag_p(newdup2) = + cpu_to_be16((char *)newdup2 - (char *)hdr); + xfs_dir2_data_log_unused(args, bp, newdup2); + /* + * If the old entry was in the table, we need to scan + * if the 3rd entry was valid, since these entries + * are smaller than the old one. + * If we don't need to scan that means there were 1 or 2 + * entries in the table, and removing the old and adding + * the 2 new will work. + */ + if (dfp) { + needscan = (bf[2].length != 0); + if (!needscan) { + xfs_dir2_data_freeremove(hdr, bf, dfp, + needlogp); + xfs_dir2_data_freeinsert(hdr, bf, newdup, + needlogp); + xfs_dir2_data_freeinsert(hdr, bf, newdup2, + needlogp); + } + } + } + *needscanp = needscan; + return 0; +corrupt: + xfs_corruption_error(__func__, XFS_ERRLEVEL_LOW, args->dp->i_mount, + hdr, sizeof(*hdr), __FILE__, __LINE__, fa); + return -EFSCORRUPTED; +} + +/* Find the end of the entry data in a data/block format dir block. */ +unsigned int +xfs_dir3_data_end_offset( + struct xfs_da_geometry *geo, + struct xfs_dir2_data_hdr *hdr) +{ + void *p; + + switch (hdr->magic) { + case cpu_to_be32(XFS_DIR3_BLOCK_MAGIC): + case cpu_to_be32(XFS_DIR2_BLOCK_MAGIC): + p = xfs_dir2_block_leaf_p(xfs_dir2_block_tail_p(geo, hdr)); + return p - (void *)hdr; + case cpu_to_be32(XFS_DIR3_DATA_MAGIC): + case cpu_to_be32(XFS_DIR2_DATA_MAGIC): + return geo->blksize; + default: + return 0; + } +} |