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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.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.c | 769 |
1 files changed, 769 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_dir2.c b/fs/xfs/libxfs/xfs_dir2.c new file mode 100644 index 000000000..92bac3373 --- /dev/null +++ b/fs/xfs/libxfs/xfs_dir2.c @@ -0,0 +1,769 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2000-2001,2005 Silicon Graphics, 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_trans.h" +#include "xfs_bmap.h" +#include "xfs_dir2.h" +#include "xfs_dir2_priv.h" +#include "xfs_errortag.h" +#include "xfs_error.h" +#include "xfs_trace.h" + +const struct xfs_name xfs_name_dotdot = { + .name = (const unsigned char *)"..", + .len = 2, + .type = XFS_DIR3_FT_DIR, +}; + +/* + * Convert inode mode to directory entry filetype + */ +unsigned char +xfs_mode_to_ftype( + int mode) +{ + switch (mode & S_IFMT) { + case S_IFREG: + return XFS_DIR3_FT_REG_FILE; + case S_IFDIR: + return XFS_DIR3_FT_DIR; + case S_IFCHR: + return XFS_DIR3_FT_CHRDEV; + case S_IFBLK: + return XFS_DIR3_FT_BLKDEV; + case S_IFIFO: + return XFS_DIR3_FT_FIFO; + case S_IFSOCK: + return XFS_DIR3_FT_SOCK; + case S_IFLNK: + return XFS_DIR3_FT_SYMLINK; + default: + return XFS_DIR3_FT_UNKNOWN; + } +} + +/* + * ASCII case-insensitive (ie. A-Z) support for directories that was + * used in IRIX. + */ +xfs_dahash_t +xfs_ascii_ci_hashname( + const struct xfs_name *name) +{ + xfs_dahash_t hash; + int i; + + for (i = 0, hash = 0; i < name->len; i++) + hash = tolower(name->name[i]) ^ rol32(hash, 7); + + return hash; +} + +enum xfs_dacmp +xfs_ascii_ci_compname( + struct xfs_da_args *args, + const unsigned char *name, + int len) +{ + enum xfs_dacmp result; + int i; + + if (args->namelen != len) + return XFS_CMP_DIFFERENT; + + result = XFS_CMP_EXACT; + for (i = 0; i < len; i++) { + if (args->name[i] == name[i]) + continue; + if (tolower(args->name[i]) != tolower(name[i])) + return XFS_CMP_DIFFERENT; + result = XFS_CMP_CASE; + } + + return result; +} + +int +xfs_da_mount( + struct xfs_mount *mp) +{ + struct xfs_da_geometry *dageo; + + + ASSERT(mp->m_sb.sb_versionnum & XFS_SB_VERSION_DIRV2BIT); + ASSERT(xfs_dir2_dirblock_bytes(&mp->m_sb) <= XFS_MAX_BLOCKSIZE); + + mp->m_dir_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), + KM_MAYFAIL); + mp->m_attr_geo = kmem_zalloc(sizeof(struct xfs_da_geometry), + KM_MAYFAIL); + if (!mp->m_dir_geo || !mp->m_attr_geo) { + kmem_free(mp->m_dir_geo); + kmem_free(mp->m_attr_geo); + return -ENOMEM; + } + + /* set up directory geometry */ + dageo = mp->m_dir_geo; + dageo->blklog = mp->m_sb.sb_blocklog + mp->m_sb.sb_dirblklog; + dageo->fsblog = mp->m_sb.sb_blocklog; + dageo->blksize = xfs_dir2_dirblock_bytes(&mp->m_sb); + dageo->fsbcount = 1 << mp->m_sb.sb_dirblklog; + if (xfs_has_crc(mp)) { + dageo->node_hdr_size = sizeof(struct xfs_da3_node_hdr); + dageo->leaf_hdr_size = sizeof(struct xfs_dir3_leaf_hdr); + dageo->free_hdr_size = sizeof(struct xfs_dir3_free_hdr); + dageo->data_entry_offset = + sizeof(struct xfs_dir3_data_hdr); + } else { + dageo->node_hdr_size = sizeof(struct xfs_da_node_hdr); + dageo->leaf_hdr_size = sizeof(struct xfs_dir2_leaf_hdr); + dageo->free_hdr_size = sizeof(struct xfs_dir2_free_hdr); + dageo->data_entry_offset = + sizeof(struct xfs_dir2_data_hdr); + } + dageo->leaf_max_ents = (dageo->blksize - dageo->leaf_hdr_size) / + sizeof(struct xfs_dir2_leaf_entry); + dageo->free_max_bests = (dageo->blksize - dageo->free_hdr_size) / + sizeof(xfs_dir2_data_off_t); + + dageo->data_first_offset = dageo->data_entry_offset + + xfs_dir2_data_entsize(mp, 1) + + xfs_dir2_data_entsize(mp, 2); + + /* + * Now we've set up the block conversion variables, we can calculate the + * segment block constants using the geometry structure. + */ + dageo->datablk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_DATA_OFFSET); + dageo->leafblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_LEAF_OFFSET); + dageo->freeblk = xfs_dir2_byte_to_da(dageo, XFS_DIR2_FREE_OFFSET); + dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / + (uint)sizeof(xfs_da_node_entry_t); + dageo->max_extents = (XFS_DIR2_MAX_SPACES * XFS_DIR2_SPACE_SIZE) >> + mp->m_sb.sb_blocklog; + dageo->magicpct = (dageo->blksize * 37) / 100; + + /* set up attribute geometry - single fsb only */ + dageo = mp->m_attr_geo; + dageo->blklog = mp->m_sb.sb_blocklog; + dageo->fsblog = mp->m_sb.sb_blocklog; + dageo->blksize = 1 << dageo->blklog; + dageo->fsbcount = 1; + dageo->node_hdr_size = mp->m_dir_geo->node_hdr_size; + dageo->node_ents = (dageo->blksize - dageo->node_hdr_size) / + (uint)sizeof(xfs_da_node_entry_t); + + if (xfs_has_large_extent_counts(mp)) + dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_LARGE; + else + dageo->max_extents = XFS_MAX_EXTCNT_ATTR_FORK_SMALL; + + dageo->magicpct = (dageo->blksize * 37) / 100; + return 0; +} + +void +xfs_da_unmount( + struct xfs_mount *mp) +{ + kmem_free(mp->m_dir_geo); + kmem_free(mp->m_attr_geo); +} + +/* + * Return 1 if directory contains only "." and "..". + */ +int +xfs_dir_isempty( + xfs_inode_t *dp) +{ + xfs_dir2_sf_hdr_t *sfp; + + ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); + if (dp->i_disk_size == 0) /* might happen during shutdown. */ + return 1; + if (dp->i_disk_size > xfs_inode_data_fork_size(dp)) + return 0; + sfp = (xfs_dir2_sf_hdr_t *)dp->i_df.if_u1.if_data; + return !sfp->count; +} + +/* + * Validate a given inode number. + */ +int +xfs_dir_ino_validate( + xfs_mount_t *mp, + xfs_ino_t ino) +{ + bool ino_ok = xfs_verify_dir_ino(mp, ino); + + if (XFS_IS_CORRUPT(mp, !ino_ok) || + XFS_TEST_ERROR(false, mp, XFS_ERRTAG_DIR_INO_VALIDATE)) { + xfs_warn(mp, "Invalid inode number 0x%Lx", + (unsigned long long) ino); + return -EFSCORRUPTED; + } + return 0; +} + +/* + * Initialize a directory with its "." and ".." entries. + */ +int +xfs_dir_init( + xfs_trans_t *tp, + xfs_inode_t *dp, + xfs_inode_t *pdp) +{ + struct xfs_da_args *args; + int error; + + ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); + error = xfs_dir_ino_validate(tp->t_mountp, pdp->i_ino); + if (error) + return error; + + args = kmem_zalloc(sizeof(*args), KM_NOFS); + if (!args) + return -ENOMEM; + + args->geo = dp->i_mount->m_dir_geo; + args->dp = dp; + args->trans = tp; + error = xfs_dir2_sf_create(args, pdp->i_ino); + kmem_free(args); + return error; +} + +/* + * Enter a name in a directory, or check for available space. + * If inum is 0, only the available space test is performed. + */ +int +xfs_dir_createname( + struct xfs_trans *tp, + struct xfs_inode *dp, + const struct xfs_name *name, + xfs_ino_t inum, /* new entry inode number */ + xfs_extlen_t total) /* bmap's total block count */ +{ + struct xfs_da_args *args; + int rval; + bool v; + + ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); + + if (inum) { + rval = xfs_dir_ino_validate(tp->t_mountp, inum); + if (rval) + return rval; + XFS_STATS_INC(dp->i_mount, xs_dir_create); + } + + args = kmem_zalloc(sizeof(*args), KM_NOFS); + if (!args) + return -ENOMEM; + + args->geo = dp->i_mount->m_dir_geo; + args->name = name->name; + args->namelen = name->len; + args->filetype = name->type; + args->hashval = xfs_dir2_hashname(dp->i_mount, name); + args->inumber = inum; + args->dp = dp; + args->total = total; + args->whichfork = XFS_DATA_FORK; + args->trans = tp; + args->op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT; + if (!inum) + args->op_flags |= XFS_DA_OP_JUSTCHECK; + + if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { + rval = xfs_dir2_sf_addname(args); + goto out_free; + } + + rval = xfs_dir2_isblock(args, &v); + if (rval) + goto out_free; + if (v) { + rval = xfs_dir2_block_addname(args); + goto out_free; + } + + rval = xfs_dir2_isleaf(args, &v); + if (rval) + goto out_free; + if (v) + rval = xfs_dir2_leaf_addname(args); + else + rval = xfs_dir2_node_addname(args); + +out_free: + kmem_free(args); + return rval; +} + +/* + * If doing a CI lookup and case-insensitive match, dup actual name into + * args.value. Return EEXIST for success (ie. name found) or an error. + */ +int +xfs_dir_cilookup_result( + struct xfs_da_args *args, + const unsigned char *name, + int len) +{ + if (args->cmpresult == XFS_CMP_DIFFERENT) + return -ENOENT; + if (args->cmpresult != XFS_CMP_CASE || + !(args->op_flags & XFS_DA_OP_CILOOKUP)) + return -EEXIST; + + args->value = kmem_alloc(len, KM_NOFS | KM_MAYFAIL); + if (!args->value) + return -ENOMEM; + + memcpy(args->value, name, len); + args->valuelen = len; + return -EEXIST; +} + +/* + * Lookup a name in a directory, give back the inode number. + * If ci_name is not NULL, returns the actual name in ci_name if it differs + * to name, or ci_name->name is set to NULL for an exact match. + */ + +int +xfs_dir_lookup( + struct xfs_trans *tp, + struct xfs_inode *dp, + const struct xfs_name *name, + xfs_ino_t *inum, /* out: inode number */ + struct xfs_name *ci_name) /* out: actual name if CI match */ +{ + struct xfs_da_args *args; + int rval; + bool v; + int lock_mode; + + ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); + XFS_STATS_INC(dp->i_mount, xs_dir_lookup); + + /* + * We need to use KM_NOFS here so that lockdep will not throw false + * positive deadlock warnings on a non-transactional lookup path. It is + * safe to recurse into inode recalim in that case, but lockdep can't + * easily be taught about it. Hence KM_NOFS avoids having to add more + * lockdep Doing this avoids having to add a bunch of lockdep class + * annotations into the reclaim path for the ilock. + */ + args = kmem_zalloc(sizeof(*args), KM_NOFS); + args->geo = dp->i_mount->m_dir_geo; + args->name = name->name; + args->namelen = name->len; + args->filetype = name->type; + args->hashval = xfs_dir2_hashname(dp->i_mount, name); + args->dp = dp; + args->whichfork = XFS_DATA_FORK; + args->trans = tp; + args->op_flags = XFS_DA_OP_OKNOENT; + if (ci_name) + args->op_flags |= XFS_DA_OP_CILOOKUP; + + lock_mode = xfs_ilock_data_map_shared(dp); + if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { + rval = xfs_dir2_sf_lookup(args); + goto out_check_rval; + } + + rval = xfs_dir2_isblock(args, &v); + if (rval) + goto out_free; + if (v) { + rval = xfs_dir2_block_lookup(args); + goto out_check_rval; + } + + rval = xfs_dir2_isleaf(args, &v); + if (rval) + goto out_free; + if (v) + rval = xfs_dir2_leaf_lookup(args); + else + rval = xfs_dir2_node_lookup(args); + +out_check_rval: + if (rval == -EEXIST) + rval = 0; + if (!rval) { + *inum = args->inumber; + if (ci_name) { + ci_name->name = args->value; + ci_name->len = args->valuelen; + } + } +out_free: + xfs_iunlock(dp, lock_mode); + kmem_free(args); + return rval; +} + +/* + * Remove an entry from a directory. + */ +int +xfs_dir_removename( + struct xfs_trans *tp, + struct xfs_inode *dp, + struct xfs_name *name, + xfs_ino_t ino, + xfs_extlen_t total) /* bmap's total block count */ +{ + struct xfs_da_args *args; + int rval; + bool v; + + ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); + XFS_STATS_INC(dp->i_mount, xs_dir_remove); + + args = kmem_zalloc(sizeof(*args), KM_NOFS); + if (!args) + return -ENOMEM; + + args->geo = dp->i_mount->m_dir_geo; + args->name = name->name; + args->namelen = name->len; + args->filetype = name->type; + args->hashval = xfs_dir2_hashname(dp->i_mount, name); + args->inumber = ino; + args->dp = dp; + args->total = total; + args->whichfork = XFS_DATA_FORK; + args->trans = tp; + + if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { + rval = xfs_dir2_sf_removename(args); + goto out_free; + } + + rval = xfs_dir2_isblock(args, &v); + if (rval) + goto out_free; + if (v) { + rval = xfs_dir2_block_removename(args); + goto out_free; + } + + rval = xfs_dir2_isleaf(args, &v); + if (rval) + goto out_free; + if (v) + rval = xfs_dir2_leaf_removename(args); + else + rval = xfs_dir2_node_removename(args); +out_free: + kmem_free(args); + return rval; +} + +/* + * Replace the inode number of a directory entry. + */ +int +xfs_dir_replace( + struct xfs_trans *tp, + struct xfs_inode *dp, + const struct xfs_name *name, /* name of entry to replace */ + xfs_ino_t inum, /* new inode number */ + xfs_extlen_t total) /* bmap's total block count */ +{ + struct xfs_da_args *args; + int rval; + bool v; + + ASSERT(S_ISDIR(VFS_I(dp)->i_mode)); + + rval = xfs_dir_ino_validate(tp->t_mountp, inum); + if (rval) + return rval; + + args = kmem_zalloc(sizeof(*args), KM_NOFS); + if (!args) + return -ENOMEM; + + args->geo = dp->i_mount->m_dir_geo; + args->name = name->name; + args->namelen = name->len; + args->filetype = name->type; + args->hashval = xfs_dir2_hashname(dp->i_mount, name); + args->inumber = inum; + args->dp = dp; + args->total = total; + args->whichfork = XFS_DATA_FORK; + args->trans = tp; + + if (dp->i_df.if_format == XFS_DINODE_FMT_LOCAL) { + rval = xfs_dir2_sf_replace(args); + goto out_free; + } + + rval = xfs_dir2_isblock(args, &v); + if (rval) + goto out_free; + if (v) { + rval = xfs_dir2_block_replace(args); + goto out_free; + } + + rval = xfs_dir2_isleaf(args, &v); + if (rval) + goto out_free; + if (v) + rval = xfs_dir2_leaf_replace(args); + else + rval = xfs_dir2_node_replace(args); +out_free: + kmem_free(args); + return rval; +} + +/* + * See if this entry can be added to the directory without allocating space. + */ +int +xfs_dir_canenter( + xfs_trans_t *tp, + xfs_inode_t *dp, + struct xfs_name *name) /* name of entry to add */ +{ + return xfs_dir_createname(tp, dp, name, 0, 0); +} + +/* + * Utility routines. + */ + +/* + * Add a block to the directory. + * + * This routine is for data and free blocks, not leaf/node blocks which are + * handled by xfs_da_grow_inode. + */ +int +xfs_dir2_grow_inode( + struct xfs_da_args *args, + int space, /* v2 dir's space XFS_DIR2_xxx_SPACE */ + xfs_dir2_db_t *dbp) /* out: block number added */ +{ + struct xfs_inode *dp = args->dp; + struct xfs_mount *mp = dp->i_mount; + xfs_fileoff_t bno; /* directory offset of new block */ + int count; /* count of filesystem blocks */ + int error; + + trace_xfs_dir2_grow_inode(args, space); + + /* + * Set lowest possible block in the space requested. + */ + bno = XFS_B_TO_FSBT(mp, space * XFS_DIR2_SPACE_SIZE); + count = args->geo->fsbcount; + + error = xfs_da_grow_inode_int(args, &bno, count); + if (error) + return error; + + *dbp = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)bno); + + /* + * Update file's size if this is the data space and it grew. + */ + if (space == XFS_DIR2_DATA_SPACE) { + xfs_fsize_t size; /* directory file (data) size */ + + size = XFS_FSB_TO_B(mp, bno + count); + if (size > dp->i_disk_size) { + dp->i_disk_size = size; + xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE); + } + } + return 0; +} + +/* + * See if the directory is a single-block form directory. + */ +int +xfs_dir2_isblock( + struct xfs_da_args *args, + bool *isblock) +{ + struct xfs_mount *mp = args->dp->i_mount; + xfs_fileoff_t eof; + int error; + + error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK); + if (error) + return error; + + *isblock = false; + if (XFS_FSB_TO_B(mp, eof) != args->geo->blksize) + return 0; + + *isblock = true; + if (XFS_IS_CORRUPT(mp, args->dp->i_disk_size != args->geo->blksize)) + return -EFSCORRUPTED; + return 0; +} + +/* + * See if the directory is a single-leaf form directory. + */ +int +xfs_dir2_isleaf( + struct xfs_da_args *args, + bool *isleaf) +{ + xfs_fileoff_t eof; + int error; + + error = xfs_bmap_last_offset(args->dp, &eof, XFS_DATA_FORK); + if (error) + return error; + + *isleaf = false; + if (eof != args->geo->leafblk + args->geo->fsbcount) + return 0; + + *isleaf = true; + return 0; +} + +/* + * Remove the given block from the directory. + * This routine is used for data and free blocks, leaf/node are done + * by xfs_da_shrink_inode. + */ +int +xfs_dir2_shrink_inode( + struct xfs_da_args *args, + xfs_dir2_db_t db, + struct xfs_buf *bp) +{ + xfs_fileoff_t bno; /* directory file offset */ + xfs_dablk_t da; /* directory file offset */ + int done; /* bunmap is finished */ + struct xfs_inode *dp; + int error; + struct xfs_mount *mp; + struct xfs_trans *tp; + + trace_xfs_dir2_shrink_inode(args, db); + + dp = args->dp; + mp = dp->i_mount; + tp = args->trans; + da = xfs_dir2_db_to_da(args->geo, db); + + /* Unmap the fsblock(s). */ + error = xfs_bunmapi(tp, dp, da, args->geo->fsbcount, 0, 0, &done); + if (error) { + /* + * ENOSPC actually can happen if we're in a removename with no + * space reservation, and the resulting block removal would + * cause a bmap btree split or conversion from extents to btree. + * This can only happen for un-fragmented directory blocks, + * since you need to be punching out the middle of an extent. + * In this case we need to leave the block in the file, and not + * binval it. So the block has to be in a consistent empty + * state and appropriately logged. We don't free up the buffer, + * the caller can tell it hasn't happened since it got an error + * back. + */ + return error; + } + ASSERT(done); + /* + * Invalidate the buffer from the transaction. + */ + xfs_trans_binval(tp, bp); + /* + * If it's not a data block, we're done. + */ + if (db >= xfs_dir2_byte_to_db(args->geo, XFS_DIR2_LEAF_OFFSET)) + return 0; + /* + * If the block isn't the last one in the directory, we're done. + */ + if (dp->i_disk_size > xfs_dir2_db_off_to_byte(args->geo, db + 1, 0)) + return 0; + bno = da; + if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) { + /* + * This can't really happen unless there's kernel corruption. + */ + return error; + } + if (db == args->geo->datablk) + ASSERT(bno == 0); + else + ASSERT(bno > 0); + /* + * Set the size to the new last block. + */ + dp->i_disk_size = XFS_FSB_TO_B(mp, bno); + xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE); + return 0; +} + +/* Returns true if the directory entry name is valid. */ +bool +xfs_dir2_namecheck( + const void *name, + size_t length) +{ + /* + * MAXNAMELEN includes the trailing null, but (name/length) leave it + * out, so use >= for the length check. + */ + if (length >= MAXNAMELEN) + return false; + + /* There shouldn't be any slashes or nulls here */ + return !memchr(name, '/', length) && !memchr(name, 0, length); +} + +xfs_dahash_t +xfs_dir2_hashname( + struct xfs_mount *mp, + const struct xfs_name *name) +{ + if (unlikely(xfs_has_asciici(mp))) + return xfs_ascii_ci_hashname(name); + return xfs_da_hashname(name->name, name->len); +} + +enum xfs_dacmp +xfs_dir2_compname( + struct xfs_da_args *args, + const unsigned char *name, + int len) +{ + if (unlikely(xfs_has_asciici(args->dp->i_mount))) + return xfs_ascii_ci_compname(args, name, len); + return xfs_da_compname(args, name, len); +} |