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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /fs/xfs/libxfs/xfs_dir2.c
downloadlinux-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.c769
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);
+}