diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/xfs/Makefile | 1 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap.c | 20 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap_btree.c | 103 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_bmap_btree.h | 7 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_format.h | 4 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_iext_tree.c | 1035 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.c | 1035 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_inode_fork.h | 84 | ||||
| -rw-r--r-- | fs/xfs/libxfs/xfs_types.h | 3 | ||||
| -rw-r--r-- | fs/xfs/scrub/bmap.c | 5 | ||||
| -rw-r--r-- | fs/xfs/xfs_inode.c | 2 | ||||
| -rw-r--r-- | fs/xfs/xfs_inode_item.c | 2 | ||||
| -rw-r--r-- | fs/xfs/xfs_trace.h | 51 |
13 files changed, 1093 insertions, 1259 deletions
diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile index a2a5d04..7ceb41a 100644 --- a/fs/xfs/Makefile +++ b/fs/xfs/Makefile @@ -49,6 +49,7 @@ xfs-y += $(addprefix libxfs/, \ xfs_dquot_buf.o \ xfs_ialloc.o \ xfs_ialloc_btree.o \ + xfs_iext_tree.o \ xfs_inode_fork.o \ xfs_inode_buf.o \ xfs_log_rlimit.o \ diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c index af3d18e..6d849a7 100644 --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -806,6 +806,8 @@ xfs_bmap_local_to_extents_empty( xfs_bmap_forkoff_reset(ip, whichfork); ifp->if_flags &= ~XFS_IFINLINE; ifp->if_flags |= XFS_IFEXTENTS; + ifp->if_u1.if_root = NULL; + ifp->if_height = 0; XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS); } @@ -847,8 +849,7 @@ xfs_bmap_local_to_extents( flags = 0; error = 0; - ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == - XFS_IFINLINE); + ASSERT((ifp->if_flags & (XFS_IFINLINE|XFS_IFEXTENTS)) == XFS_IFINLINE); memset(&args, 0, sizeof(args)); args.tp = tp; args.mp = ip->i_mount; @@ -892,6 +893,9 @@ xfs_bmap_local_to_extents( xfs_bmap_local_to_extents_empty(ip, whichfork); flags |= XFS_ILOG_CORE; + ifp->if_u1.if_root = NULL; + ifp->if_height = 0; + rec.br_startoff = 0; rec.br_startblock = args.fsbno; rec.br_blockcount = 1; @@ -1178,6 +1182,7 @@ xfs_iread_extents( xfs_extnum_t nextents = XFS_IFORK_NEXTENTS(ip, whichfork); struct xfs_btree_block *block = ifp->if_broot; struct xfs_iext_cursor icur; + struct xfs_bmbt_irec new; xfs_fsblock_t bno; struct xfs_buf *bp; xfs_extnum_t i, j; @@ -1192,10 +1197,6 @@ xfs_iread_extents( return -EFSCORRUPTED; } - ifp->if_bytes = 0; - ifp->if_real_bytes = 0; - xfs_iext_add(ifp, 0, nextents); - /* * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out. */ @@ -1259,16 +1260,15 @@ xfs_iread_extents( * Copy records into the extent records. */ frp = XFS_BMBT_REC_ADDR(mp, block, 1); - for (j = 0; j < num_recs; j++, i++, frp++) { - xfs_bmbt_rec_host_t *trp = xfs_iext_get_ext(ifp, i); + for (j = 0; j < num_recs; j++, frp++, i++) { if (!xfs_bmbt_validate_extent(mp, whichfork, frp)) { XFS_ERROR_REPORT("xfs_bmap_read_extents(2)", XFS_ERRLEVEL_LOW, mp); error = -EFSCORRUPTED; goto out_brelse; } - trp->l0 = be64_to_cpu(frp->l0); - trp->l1 = be64_to_cpu(frp->l1); + xfs_bmbt_disk_get_all(frp, &new); + xfs_iext_insert(ip, &icur, 1, &new, state); trace_xfs_read_extent(ip, &icur, state, _THIS_IP_); xfs_iext_next(ifp, &icur); } diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c index 8926097..c10aeca 100644 --- a/fs/xfs/libxfs/xfs_bmap_btree.c +++ b/fs/xfs/libxfs/xfs_bmap_btree.c @@ -71,73 +71,21 @@ xfs_bmdr_to_bmbt( memcpy(tpp, fpp, sizeof(*fpp) * dmxr); } -/* - * Convert a compressed bmap extent record to an uncompressed form. - * This code must be in sync with the routines xfs_bmbt_get_startoff, - * xfs_bmbt_get_startblock and xfs_bmbt_get_blockcount. - */ -STATIC void -__xfs_bmbt_get_all( - uint64_t l0, - uint64_t l1, - xfs_bmbt_irec_t *s) -{ - int ext_flag; - xfs_exntst_t st; - - ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN)); - s->br_startoff = ((xfs_fileoff_t)l0 & - xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; - s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) | - (((xfs_fsblock_t)l1) >> 21); - s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21)); - /* This is xfs_extent_state() in-line */ - if (ext_flag) { - ASSERT(s->br_blockcount != 0); /* saved for DMIG */ - st = XFS_EXT_UNWRITTEN; - } else - st = XFS_EXT_NORM; - s->br_state = st; -} - void -xfs_bmbt_get_all( - xfs_bmbt_rec_host_t *r, - xfs_bmbt_irec_t *s) -{ - __xfs_bmbt_get_all(r->l0, r->l1, s); -} - -/* - * Extract the blockcount field from an in memory bmap extent record. - */ -xfs_filblks_t -xfs_bmbt_get_blockcount( - xfs_bmbt_rec_host_t *r) -{ - return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21)); -} - -/* - * Extract the startblock field from an in memory bmap extent record. - */ -xfs_fsblock_t -xfs_bmbt_get_startblock( - xfs_bmbt_rec_host_t *r) -{ - return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) | - (((xfs_fsblock_t)r->l1) >> 21); -} - -/* - * Extract the startoff field from an in memory bmap extent record. - */ -xfs_fileoff_t -xfs_bmbt_get_startoff( - xfs_bmbt_rec_host_t *r) -{ - return ((xfs_fileoff_t)r->l0 & - xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; +xfs_bmbt_disk_get_all( + struct xfs_bmbt_rec *rec, + struct xfs_bmbt_irec *irec) +{ + uint64_t l0 = get_unaligned_be64(&rec->l0); + uint64_t l1 = get_unaligned_be64(&rec->l1); + + irec->br_startoff = (l0 & xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; + irec->br_startblock = ((l0 & xfs_mask64lo(9)) << 43) | (l1 >> 21); + irec->br_blockcount = l1 & xfs_mask64lo(21); + if (l0 >> (64 - BMBT_EXNTFLAG_BITLEN)) + irec->br_state = XFS_EXT_UNWRITTEN; + else + irec->br_state = XFS_EXT_NORM; } /* @@ -165,29 +113,6 @@ xfs_bmbt_disk_get_startoff( * Set all the fields in a bmap extent record from the uncompressed form. */ void -xfs_bmbt_set_all( - struct xfs_bmbt_rec_host *r, - struct xfs_bmbt_irec *s) -{ - int extent_flag = (s->br_state != XFS_EXT_NORM); - - ASSERT(s->br_state == XFS_EXT_NORM || s->br_state == XFS_EXT_UNWRITTEN); - ASSERT(!(s->br_startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN))); - ASSERT(!(s->br_blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN))); - ASSERT(!(s->br_startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN))); - - r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | - ((xfs_bmbt_rec_base_t)s->br_startoff << 9) | - ((xfs_bmbt_rec_base_t)s->br_startblock >> 43); - r->l1 = ((xfs_bmbt_rec_base_t)s->br_startblock << 21) | - ((xfs_bmbt_rec_base_t)s->br_blockcount & - (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); -} - -/* - * Set all the fields in a bmap extent record from the uncompressed form. - */ -void xfs_bmbt_disk_set_all( struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s) diff --git a/fs/xfs/libxfs/xfs_bmap_btree.h b/fs/xfs/libxfs/xfs_bmap_btree.h index 2fbfe2a..714bfba 100644 --- a/fs/xfs/libxfs/xfs_bmap_btree.h +++ b/fs/xfs/libxfs/xfs_bmap_btree.h @@ -98,16 +98,11 @@ struct xfs_trans; */ extern void xfs_bmdr_to_bmbt(struct xfs_inode *, xfs_bmdr_block_t *, int, struct xfs_btree_block *, int); -extern void xfs_bmbt_get_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s); -extern xfs_filblks_t xfs_bmbt_get_blockcount(xfs_bmbt_rec_host_t *r); -extern xfs_fsblock_t xfs_bmbt_get_startblock(xfs_bmbt_rec_host_t *r); -extern xfs_fileoff_t xfs_bmbt_get_startoff(xfs_bmbt_rec_host_t *r); void xfs_bmbt_disk_set_all(struct xfs_bmbt_rec *r, struct xfs_bmbt_irec *s); extern xfs_filblks_t xfs_bmbt_disk_get_blockcount(xfs_bmbt_rec_t *r); extern xfs_fileoff_t xfs_bmbt_disk_get_startoff(xfs_bmbt_rec_t *r); - -extern void xfs_bmbt_set_all(xfs_bmbt_rec_host_t *r, xfs_bmbt_irec_t *s); +extern void xfs_bmbt_disk_get_all(xfs_bmbt_rec_t *r, xfs_bmbt_irec_t *s); extern void xfs_bmbt_to_bmdr(struct xfs_mount *, struct xfs_btree_block *, int, xfs_bmdr_block_t *, int); diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h index 1e8c0b2..fbe7d3c 100644 --- a/fs/xfs/libxfs/xfs_format.h +++ b/fs/xfs/libxfs/xfs_format.h @@ -1553,10 +1553,6 @@ typedef struct xfs_bmbt_rec { typedef uint64_t xfs_bmbt_rec_base_t; /* use this for casts */ typedef xfs_bmbt_rec_t xfs_bmdr_rec_t; -typedef struct xfs_bmbt_rec_host { - uint64_t l0, l1; -} xfs_bmbt_rec_host_t; - /* * Values and macros for delayed-allocation startblock fields. */ diff --git a/fs/xfs/libxfs/xfs_iext_tree.c b/fs/xfs/libxfs/xfs_iext_tree.c new file mode 100644 index 0000000..b15f85b --- /dev/null +++ b/fs/xfs/libxfs/xfs_iext_tree.c @@ -0,0 +1,1035 @@ +/* + * Copyright (c) 2017 Christoph Hellwig. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/cache.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include "xfs.h" +#include "xfs_format.h" +#include "xfs_bit.h" +#include "xfs_log_format.h" +#include "xfs_inode.h" +#include "xfs_inode_fork.h" +#include "xfs_trans_resv.h" +#include "xfs_mount.h" +#include "xfs_trace.h" + +/* + * In-core extent record layout: + * + * +-------+----------------------------+ + * | 00:53 | all 54 bits of startoff | + * | 54:63 | low 10 bits of startblock | + * +-------+----------------------------+ + * | 00:20 | all 21 bits of length | + * | 21 | unwritten extent bit | + * | 22:63 | high 42 bits of startblock | + * +-------+----------------------------+ + */ +#define XFS_IEXT_STARTOFF_MASK xfs_mask64lo(BMBT_STARTOFF_BITLEN) +#define XFS_IEXT_LENGTH_MASK xfs_mask64lo(BMBT_BLOCKCOUNT_BITLEN) +#define XFS_IEXT_STARTBLOCK_MASK xfs_mask64lo(BMBT_STARTBLOCK_BITLEN) + +struct xfs_iext_rec { + uint64_t lo; + uint64_t hi; +}; + +/* + * Given that the length can't be a zero, only an empty hi value indicates an + * unused record. + */ +static bool xfs_iext_rec_is_empty(struct xfs_iext_rec *rec) +{ + return rec->hi == 0; +} + +static inline void xfs_iext_rec_clear(struct xfs_iext_rec *rec) +{ + rec->lo = 0; + rec->hi = 0; +} + +static void +xfs_iext_set( + struct xfs_iext_rec *rec, + struct xfs_bmbt_irec *irec) +{ + ASSERT((irec->br_startoff & ~XFS_IEXT_STARTOFF_MASK) == 0); + ASSERT((irec->br_blockcount & ~XFS_IEXT_LENGTH_MASK) == 0); + ASSERT((irec->br_startblock & ~XFS_IEXT_STARTBLOCK_MASK) == 0); + + rec->lo = irec->br_startoff & XFS_IEXT_STARTOFF_MASK; + rec->hi = irec->br_blockcount & XFS_IEXT_LENGTH_MASK; + + rec->lo |= (irec->br_startblock << 54); + rec->hi |= ((irec->br_startblock & ~xfs_mask64lo(10)) << (22 - 10)); + + if (irec->br_state == XFS_EXT_UNWRITTEN) + rec->hi |= (1 << 21); +} + +static void +xfs_iext_get( + struct xfs_bmbt_irec *irec, + struct xfs_iext_rec *rec) +{ + irec->br_startoff = rec->lo & XFS_IEXT_STARTOFF_MASK; + irec->br_blockcount = rec->hi & XFS_IEXT_LENGTH_MASK; + + irec->br_startblock = rec->lo >> 54; + irec->br_startblock |= (rec->hi & xfs_mask64hi(42)) >> (22 - 10); + + if (rec->hi & (1 << 21)) + irec->br_state = XFS_EXT_UNWRITTEN; + else + irec->br_state = XFS_EXT_NORM; +} + +enum { + NODE_SIZE = 256, + KEYS_PER_NODE = NODE_SIZE / (sizeof(uint64_t) + sizeof(void *)), + RECS_PER_LEAF = (NODE_SIZE - (2 * sizeof(struct xfs_iext_leaf *))) / + sizeof(struct xfs_iext_rec), +}; + +/* + * In-core extent btree block layout: + * + * There are two types of blocks in the btree: leaf and inner (non-leaf) blocks. + * + * The leaf blocks are made up by %KEYS_PER_NODE extent records, which each + * contain the startoffset, blockcount, startblock and unwritten extent flag. + * See above for the exact format, followed by pointers to the previous and next + * leaf blocks (if there are any). + * + * The inner (non-leaf) blocks first contain KEYS_PER_NODE lookup keys, followed + * by an equal number of pointers to the btree blocks at the next lower level. + * + * +-------+-------+-------+-------+-------+----------+----------+ + * Leaf: | rec 1 | rec 2 | rec 3 | rec 4 | rec N | prev-ptr | next-ptr | + * +-------+-------+-------+-------+-------+----------+----------+ + * + * +-------+-------+-------+-------+-------+-------+------+-------+ + * Inner: | key 1 | key 2 | key 3 | key N | ptr 1 | ptr 2 | ptr3 | ptr N | + * +-------+-------+-------+-------+-------+-------+------+-------+ + */ +struct xfs_iext_node { + uint64_t keys[KEYS_PER_NODE]; +#define XFS_IEXT_KEY_INVALID (1ULL << 63) + void *ptrs[KEYS_PER_NODE]; +}; + +struct xfs_iext_leaf { + struct xfs_iext_rec recs[RECS_PER_LEAF]; + struct xfs_iext_leaf *prev; + struct xfs_iext_leaf *next; +}; + +inline xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp) +{ + return ifp->if_bytes / sizeof(struct xfs_iext_rec); +} + +static inline int xfs_iext_max_recs(struct xfs_ifork *ifp) +{ + if (ifp->if_height == 1) + return xfs_iext_count(ifp); + return RECS_PER_LEAF; +} + +static inline struct xfs_iext_rec *cur_rec(struct xfs_iext_cursor *cur) +{ + return &cur->leaf->recs[cur->pos]; +} + +static inline bool xfs_iext_valid(struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + if (!cur->leaf) + return false; + if (cur->pos < 0 || cur->pos >= xfs_iext_max_recs(ifp)) + return false; + if (xfs_iext_rec_is_empty(cur_rec(cur))) + return false; + return true; +} + +static void * +xfs_iext_find_first_leaf( + struct xfs_ifork *ifp) +{ + struct xfs_iext_node *node = ifp->if_u1.if_root; + int height; + + if (!ifp->if_height) + return NULL; + + for (height = ifp->if_height; height > 1; height--) { + node = node->ptrs[0]; + ASSERT(node); + } + + return node; +} + +static void * +xfs_iext_find_last_leaf( + struct xfs_ifork *ifp) +{ + struct xfs_iext_node *node = ifp->if_u1.if_root; + int height, i; + + if (!ifp->if_height) + return NULL; + + for (height = ifp->if_height; height > 1; height--) { + for (i = 1; i < KEYS_PER_NODE; i++) + if (!node->ptrs[i]) + break; + node = node->ptrs[i - 1]; + ASSERT(node); + } + + return node; +} + +void +xfs_iext_first( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + cur->pos = 0; + cur->leaf = xfs_iext_find_first_leaf(ifp); +} + +void +xfs_iext_last( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + int i; + + cur->leaf = xfs_iext_find_last_leaf(ifp); + if (!cur->leaf) { + cur->pos = 0; + return; + } + + for (i = 1; i < xfs_iext_max_recs(ifp); i++) { + if (xfs_iext_rec_is_empty(&cur->leaf->recs[i])) + break; + } + cur->pos = i - 1; +} + +void +xfs_iext_next( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + if (!cur->leaf) { + ASSERT(cur->pos <= 0 || cur->pos >= RECS_PER_LEAF); + xfs_iext_first(ifp, cur); + return; + } + + ASSERT(cur->pos >= 0); + ASSERT(cur->pos < xfs_iext_max_recs(ifp)); + + cur->pos++; + if (ifp->if_height > 1 && !xfs_iext_valid(ifp, cur) && + cur->leaf->next) { + cur->leaf = cur->leaf->next; + cur->pos = 0; + } +} + +void +xfs_iext_prev( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + if (!cur->leaf) { + ASSERT(cur->pos <= 0 || cur->pos >= RECS_PER_LEAF); + xfs_iext_last(ifp, cur); + return; + } + + ASSERT(cur->pos >= 0); + ASSERT(cur->pos <= RECS_PER_LEAF); + +recurse: + do { + cur->pos--; + if (xfs_iext_valid(ifp, cur)) + return; + } while (cur->pos > 0); + + if (ifp->if_height > 1 && cur->leaf->prev) { + cur->leaf = cur->leaf->prev; + cur->pos = RECS_PER_LEAF; + goto recurse; + } +} + +static inline int +xfs_iext_key_cmp( + struct xfs_iext_node *node, + int n, + xfs_fileoff_t offset) +{ + if (node->keys[n] > offset) + return 1; + if (node->keys[n] < offset) + return -1; + return 0; +} + +static inline int +xfs_iext_rec_cmp( + struct xfs_iext_rec *rec, + xfs_fileoff_t offset) +{ + uint64_t rec_offset = rec->lo & XFS_IEXT_STARTOFF_MASK; + u32 rec_len = rec->hi & XFS_IEXT_LENGTH_MASK; + + if (rec_offset > offset) + return 1; + if (rec_offset + rec_len <= offset) + return -1; + return 0; +} + +static void * +xfs_iext_find_level( + struct xfs_ifork *ifp, + xfs_fileoff_t offset, + int level) +{ + struct xfs_iext_node *node = ifp->if_u1.if_root; + int height, i; + + if (!ifp->if_height) + return NULL; + + for (height = ifp->if_height; height > level; height--) { + for (i = 1; i < KEYS_PER_NODE; i++) + if (xfs_iext_key_cmp(node, i, offset) > 0) + break; + + node = node->ptrs[i - 1]; + if (!node) + break; + } + + return node; +} + +static int +xfs_iext_node_pos( + struct xfs_iext_node *node, + xfs_fileoff_t offset) +{ + int i; + + for (i = 1; i < KEYS_PER_NODE; i++) { + if (xfs_iext_key_cmp(node, i, offset) > 0) + break; + } + + return i - 1; +} + +static int +xfs_iext_node_insert_pos( + struct xfs_iext_node *node, + xfs_fileoff_t offset) +{ + int i; + + for (i = 0; i < KEYS_PER_NODE; i++) { + if (xfs_iext_key_cmp(node, i, offset) > 0) + return i; + } + + return KEYS_PER_NODE; +} + +static int +xfs_iext_node_nr_entries( + struct xfs_iext_node *node, + int start) +{ + int i; + + for (i = start; i < KEYS_PER_NODE; i++) { + if (node->keys[i] == XFS_IEXT_KEY_INVALID) + break; + } + + return i; +} + +static int +xfs_iext_leaf_nr_entries( + struct xfs_ifork *ifp, + struct xfs_iext_leaf *leaf, + int start) +{ + int i; + + for (i = start; i < xfs_iext_max_recs(ifp); i++) { + if (xfs_iext_rec_is_empty(&leaf->recs[i])) + break; + } + + return i; +} + +static inline uint64_t +xfs_iext_leaf_key( + struct xfs_iext_leaf *leaf, + int n) +{ + return leaf->recs[n].lo & XFS_IEXT_STARTOFF_MASK; +} + +static void +xfs_iext_grow( + struct xfs_ifork *ifp) +{ + struct xfs_iext_node *node = kmem_zalloc(NODE_SIZE, KM_NOFS); + int i; + + if (ifp->if_height == 1) { + struct xfs_iext_leaf *prev = ifp->if_u1.if_root; + + node->keys[0] = xfs_iext_leaf_key(prev, 0); + node->ptrs[0] = prev; + } else { + struct xfs_iext_node *prev = ifp->if_u1.if_root; + + ASSERT(ifp->if_height > 1); + + node->keys[0] = prev->keys[0]; + node->ptrs[0] = prev; + } + + for (i = 1; i < KEYS_PER_NODE; i++) + node->keys[i] = XFS_IEXT_KEY_INVALID; + + ifp->if_u1.if_root = node; + ifp->if_height++; +} + +static void +xfs_iext_update_node( + struct xfs_ifork *ifp, + xfs_fileoff_t old_offset, + xfs_fileoff_t new_offset, + int level, + void *ptr) +{ + struct xfs_iext_node *node = ifp->if_u1.if_root; + int height, i; + + for (height = ifp->if_height; height > level; height--) { + for (i = 0; i < KEYS_PER_NODE; i++) { + if (i > 0 && xfs_iext_key_cmp(node, i, old_offset) > 0) + break; + if (node->keys[i] == old_offset) + node->keys[i] = new_offset; + } + node = node->ptrs[i - 1]; + ASSERT(node); + } + + ASSERT(node == ptr); +} + +static struct xfs_iext_node * +xfs_iext_split_node( + struct xfs_iext_node **nodep, + int *pos, + int *nr_entries) +{ + struct xfs_iext_node *node = *nodep; + struct xfs_iext_node *new = kmem_zalloc(NODE_SIZE, KM_NOFS); + const int nr_move = KEYS_PER_NODE / 2; + int nr_keep = nr_move + (KEYS_PER_NODE & 1); + int i = 0; + + /* for sequential append operations just spill over into the new node */ + if (*pos == KEYS_PER_NODE) { + *nodep = new; + *pos = 0; + *nr_entries = 0; + goto done; + } + + + for (i = 0; i < nr_move; i++) { + new->keys[i] = node->keys[nr_keep + i]; + new->ptrs[i] = node->ptrs[nr_keep + i]; + + node->keys[nr_keep + i] = XFS_IEXT_KEY_INVALID; + node->ptrs[nr_keep + i] = NULL; + } + + if (*pos >= nr_keep) { + *nodep = new; + *pos -= nr_keep; + *nr_entries = nr_move; + } else { + *nr_entries = nr_keep; + } +done: + for (; i < KEYS_PER_NODE; i++) + new->keys[i] = XFS_IEXT_KEY_INVALID; + return new; +} + +static void +xfs_iext_insert_node( + struct xfs_ifork *ifp, + uint64_t offset, + void *ptr, + int level) +{ + struct xfs_iext_node *node, *new; + int i, pos, nr_entries; + +again: + if (ifp->if_height < level) + xfs_iext_grow(ifp); + + new = NULL; + node = xfs_iext_find_level(ifp, offset, level); + pos = xfs_iext_node_insert_pos(node, offset); + nr_entries = xfs_iext_node_nr_entries(node, pos); + + ASSERT(pos >= nr_entries || xfs_iext_key_cmp(node, pos, offset) != 0); + ASSERT(nr_entries <= KEYS_PER_NODE); + + if (nr_entries == KEYS_PER_NODE) + new = xfs_iext_split_node(&node, &pos, &nr_entries); + + if (node != new && pos == 0 && nr_entries > 0) + xfs_iext_update_node(ifp, node->keys[0], offset, level, node); + + for (i = nr_entries; i > pos; i--) { + node->keys[i] = node->keys[i - 1]; + node->ptrs[i] = node->ptrs[i - 1]; + } + node->keys[pos] = offset; + node->ptrs[pos] = ptr; + + if (new) { + offset = new->keys[0]; + ptr = new; + level++; + goto again; + } +} + +static struct xfs_iext_leaf * +xfs_iext_split_leaf( + struct xfs_iext_cursor *cur, + int *nr_entries) +{ + struct xfs_iext_leaf *leaf = cur->leaf; + struct xfs_iext_leaf *new = kmem_zalloc(NODE_SIZE, KM_NOFS); + const int nr_move = RECS_PER_LEAF / 2; + int nr_keep = nr_move + (RECS_PER_LEAF & 1); + int i; + + /* for sequential append operations just spill over into the new node */ + if (cur->pos == KEYS_PER_NODE) { + cur->leaf = new; + cur->pos = 0; + *nr_entries = 0; + goto done; + } + + if (nr_keep & 1) + nr_keep++; + + for (i = 0; i < nr_move; i++) { + new->recs[i] = leaf->recs[nr_keep + i]; + xfs_iext_rec_clear(&leaf->recs[nr_keep + i]); + } + + if (cur->pos >= nr_keep) { + cur->leaf = new; + cur->pos -= nr_keep; + *nr_entries = nr_move; + } else { + *nr_entries = nr_keep; + } +done: + if (leaf->next) + leaf->next->prev = new; + new->next = leaf->next; + new->prev = leaf; + leaf->next = new; + return new; +} + +static void +xfs_iext_alloc_root( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + ASSERT(ifp->if_bytes == 0); + + ifp->if_u1.if_root = kmem_zalloc(sizeof(struct xfs_iext_rec), KM_NOFS); + ifp->if_height = 1; + + /* now that we have a node step into it */ + cur->leaf = ifp->if_u1.if_root; + cur->pos = 0; +} + +static void +xfs_iext_realloc_root( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + size_t new_size = ifp->if_bytes + sizeof(struct xfs_iext_rec); + void *new; + + /* account for the prev/next pointers */ + if (new_size / sizeof(struct xfs_iext_rec) == RECS_PER_LEAF) + new_size = NODE_SIZE; + + new = kmem_realloc(ifp->if_u1.if_root, new_size, KM_NOFS); + memset(new + ifp->if_bytes, 0, new_size - ifp->if_bytes); + ifp->if_u1.if_root = new; + cur->leaf = new; +} + +static void +__xfs_iext_insert( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur, + struct xfs_bmbt_irec *irec) +{ + xfs_fileoff_t offset = irec->br_startoff; + struct xfs_iext_leaf *new = NULL; + int nr_entries, i; + + if (ifp->if_height == 0) + xfs_iext_alloc_root(ifp, cur); + else if (ifp->if_height == 1) + xfs_iext_realloc_root(ifp, cur); + + nr_entries = xfs_iext_leaf_nr_entries(ifp, cur->leaf, cur->pos); + ASSERT(nr_entries <= RECS_PER_LEAF); + ASSERT(cur->pos >= nr_entries || + xfs_iext_rec_cmp(cur_rec(cur), irec->br_startoff) != 0); + + if (nr_entries == RECS_PER_LEAF) + new = xfs_iext_split_leaf(cur, &nr_entries); + + if (cur->leaf != new && cur->pos == 0 && nr_entries > 0) { + xfs_iext_update_node(ifp, xfs_iext_leaf_key(cur->leaf, 0), + offset, 1, cur->leaf); + } + + for (i = nr_entries; i > cur->pos; i--) + cur->leaf->recs[i] = cur->leaf->recs[i - 1]; + xfs_iext_set(cur_rec(cur), irec); + ifp->if_bytes += sizeof(struct xfs_iext_rec); + + if (new) + xfs_iext_insert_node(ifp, xfs_iext_leaf_key(new, 0), new, 2); +} + +void +xfs_iext_insert( + struct xfs_inode *ip, + struct xfs_iext_cursor *cur, + xfs_extnum_t nr_extents, + struct xfs_bmbt_irec *new, + int state) +{ + struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state); + int i; + + ASSERT(nr_extents > 0); + + for (i = nr_extents - 1; i >= 0; i--) { + __xfs_iext_insert(ifp, cur, new + i); + trace_xfs_iext_insert(ip, cur, state, _RET_IP_); + } +} + +static struct xfs_iext_node * +xfs_iext_rebalance_node( + struct xfs_iext_node *parent, + int *pos, + struct xfs_iext_node *node, + int nr_entries) +{ + if (nr_entries == 0) + return node; + + if (*pos > 0) { + struct xfs_iext_node *prev = parent->ptrs[*pos - 1]; + int nr_prev = xfs_iext_node_nr_entries(prev, 0), i; + + if (nr_prev + nr_entries <= KEYS_PER_NODE) { + for (i = 0; i < nr_entries; i++) { + prev->keys[nr_prev + i] = node->keys[i]; + prev->ptrs[nr_prev + i] = node->ptrs[i]; + } + return node; + } + } + + if (*pos + 1 < xfs_iext_node_nr_entries(parent, *pos)) { + struct xfs_iext_node *next = parent->ptrs[*pos + 1]; + int nr_next = xfs_iext_node_nr_entries(next, 0), i; + + if (nr_entries + nr_next <= KEYS_PER_NODE) { + for (i = 0; i < nr_next; i++) { + node->keys[nr_entries + i] = next->keys[i]; + node->ptrs[nr_entries + i] = next->ptrs[i]; + } + + ++*pos; + return next; + } + } + + return NULL; +} + +static void +xfs_iext_remove_node( + struct xfs_ifork *ifp, + xfs_fileoff_t offset, + void *victim) +{ + struct xfs_iext_node *node, *parent; + int level = 2, pos, nr_entries, i; + + ASSERT(level <= ifp->if_height); + node = xfs_iext_find_level(ifp, offset, level); + pos = xfs_iext_node_pos(node, offset); +again: + ASSERT(node->ptrs[pos]); + ASSERT(node->ptrs[pos] == victim); + kmem_free(victim); + + nr_entries = xfs_iext_node_nr_entries(node, pos) - 1; + offset = node->keys[0]; + for (i = pos; i < nr_entries; i++) { + node->keys[i] = node->keys[i + 1]; + node->ptrs[i] = node->ptrs[i + 1]; + } + node->keys[nr_entries] = XFS_IEXT_KEY_INVALID; + node->ptrs[nr_entries] = NULL; + + if (pos == 0 && nr_entries > 0) { + xfs_iext_update_node(ifp, offset, node->keys[0], level, + node); + offset = node->keys[0]; + } + + if (nr_entries >= KEYS_PER_NODE / 2) + return; + + if (level < ifp->if_height) { + level++; + parent = xfs_iext_find_level(ifp, offset, level); + pos = xfs_iext_node_pos(parent, offset); + + ASSERT(pos != KEYS_PER_NODE); + ASSERT(parent->ptrs[pos] == node); + + node = xfs_iext_rebalance_node(parent, &pos, node, nr_entries); + if (node) { + offset = node->keys[0]; + victim = node; + node = parent; + goto again; + } + } else if (nr_entries == 1) { + ASSERT(node == ifp->if_u1.if_root); + ifp->if_u1.if_root = node->ptrs[0]; + ifp->if_height--; + kmem_free(node); + } +} + +static void +xfs_iext_rebalance_leaf( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur, + struct xfs_iext_leaf *leaf, + xfs_fileoff_t offset, + int fill) +{ + if (leaf->prev) { + int nr_prev = xfs_iext_leaf_nr_entries(ifp, leaf->prev, 0), i; + + if (nr_prev + fill <= RECS_PER_LEAF) { + for (i = 0; i < fill; i++) + leaf->prev->recs[nr_prev + i] = leaf->recs[i]; + + if (cur->leaf == leaf) { + cur->leaf = leaf->prev; + cur->pos += nr_prev; + } + goto remove_node; + } + } + + if (leaf->next) { + int nr_next = xfs_iext_leaf_nr_entries(ifp, leaf->next, 0), i; + + if (fill + nr_next <= RECS_PER_LEAF) { + for (i = 0; i < nr_next; i++) + leaf->recs[fill + i] = leaf->next->recs[i]; + + if (cur->leaf == leaf->next) { + cur->leaf = leaf; + cur->pos += fill; + } + + offset = xfs_iext_leaf_key(leaf->next, 0); + leaf = leaf->next; + goto remove_node; + } + } + + return; +remove_node: + if (leaf->prev) + leaf->prev->next = leaf->next; + if (leaf->next) + leaf->next->prev = leaf->prev; + xfs_iext_remove_node(ifp, offset, leaf); +} + +static void +xfs_iext_free_last_leaf( + struct xfs_ifork *ifp) +{ + ifp->if_u1.if_root = NULL; + ifp->if_height--; + kmem_free(ifp->if_u1.if_root); +} + +static void +__xfs_iext_remove( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur) +{ + struct xfs_iext_leaf *leaf = cur->leaf; + xfs_fileoff_t offset = xfs_iext_leaf_key(leaf, 0); + int i, nr_entries; + + ASSERT(ifp->if_height > 0); + ASSERT(ifp->if_u1.if_root != NULL); + ASSERT(xfs_iext_valid(ifp, cur)); + + nr_entries = xfs_iext_leaf_nr_entries(ifp, leaf, cur->pos) - 1; + for (i = cur->pos; i < nr_entries; i++) + leaf->recs[i] = leaf->recs[i + 1]; + xfs_iext_rec_clear(&leaf->recs[nr_entries]); + ifp->if_bytes -= sizeof(struct xfs_iext_rec); + + if (cur->pos == 0 && nr_entries > 0) { + xfs_iext_update_node(ifp, offset, xfs_iext_leaf_key(leaf, 0), 1, + leaf); + offset = xfs_iext_leaf_key(leaf, 0); + } else if (cur->pos == nr_entries) { + if (ifp->if_height > 1 && leaf->next) + cur->leaf = leaf->next; + else + cur->leaf = NULL; + cur->pos = 0; + } + + if (nr_entries >= RECS_PER_LEAF / 2) + return; + + if (ifp->if_height > 1) + xfs_iext_rebalance_leaf(ifp, cur, leaf, offset, nr_entries); + else if (nr_entries == 0) + xfs_iext_free_last_leaf(ifp); +} + +void +xfs_iext_remove( + struct xfs_inode *ip, + struct xfs_iext_cursor *cur, + int nr_extents, + int state) +{ + struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state); + int i; + + ASSERT(nr_extents > 0); + + for (i = 0; i < nr_extents; i++) { + trace_xfs_iext_remove(ip, cur, state, _RET_IP_); + __xfs_iext_remove(ifp, cur); + } +} + +/* + * Lookup the extent covering bno. + * + * If there is an extent covering bno return the extent index, and store the + * expanded extent structure in *gotp, and the extent cursor in *cur. + * If there is no extent covering bno, but there is an extent after it (e.g. + * it lies in a hole) return that extent in *gotp and its cursor in *cur + * instead. + * If bno is beyond the last extent return false, and return an invalid + * cursor value. + */ +bool +xfs_iext_lookup_extent( + struct xfs_inode *ip, + struct xfs_ifork *ifp, + xfs_fileoff_t offset, + struct xfs_iext_cursor *cur, + struct xfs_bmbt_irec *gotp) +{ + XFS_STATS_INC(ip->i_mount, xs_look_exlist); + + cur->leaf = xfs_iext_find_level(ifp, offset, 1); + if (!cur->leaf) { + cur->pos = 0; + return false; + } + + for (cur->pos = 0; cur->pos < xfs_iext_max_recs(ifp); cur->pos++) { + struct xfs_iext_rec *rec = cur_rec(cur); + + if (xfs_iext_rec_is_empty(rec)) + break; + if (xfs_iext_rec_cmp(rec, offset) >= 0) + goto found; + } + + /* Try looking in the next node for an entry > offset */ + if (ifp->if_height == 1 || !cur->leaf->next) + return false; + cur->leaf = cur->leaf->next; + cur->pos = 0; + if (!xfs_iext_valid(ifp, cur)) + return false; +found: + xfs_iext_get(gotp, cur_rec(cur)); + return true; +} + +/* + * Returns the last extent before end, and if this extent doesn't cover + * end, update end to the end of the extent. + */ +bool +xfs_iext_lookup_extent_before( + struct xfs_inode *ip, + struct xfs_ifork *ifp, + xfs_fileoff_t *end, + struct xfs_iext_cursor *cur, + struct xfs_bmbt_irec *gotp) +{ + /* could be optimized to not even look up the next on a match.. */ + if (xfs_iext_lookup_extent(ip, ifp, *end - 1, cur, gotp) && + gotp->br_startoff <= *end - 1) + return true; + if (!xfs_iext_prev_extent(ifp, cur, gotp)) + return false; + *end = gotp->br_startoff + gotp->br_blockcount; + return true; +} + +void +xfs_iext_update_extent( + struct xfs_inode *ip, + int state, + struct xfs_iext_cursor *cur, + struct xfs_bmbt_irec *new) +{ + struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state); + + if (cur->pos == 0) { + struct xfs_bmbt_irec old; + + xfs_iext_get(&old, cur_rec(cur)); + if (new->br_startoff != old.br_startoff) { + xfs_iext_update_node(ifp, old.br_startoff, + new->br_startoff, 1, cur->leaf); + } + } + + trace_xfs_bmap_pre_update(ip, cur, state, _RET_IP_); + xfs_iext_set(cur_rec(cur), new); + trace_xfs_bmap_post_update(ip, cur, state, _RET_IP_); +} + +/* + * Return true if the cursor points at an extent and return the extent structure + * in gotp. Else return false. + */ +bool +xfs_iext_get_extent( + struct xfs_ifork *ifp, + struct xfs_iext_cursor *cur, + struct xfs_bmbt_irec *gotp) +{ + if (!xfs_iext_valid(ifp, cur)) + return false; + xfs_iext_get(gotp, cur_rec(cur)); + return true; +} + +/* + * This is a recursive function, because of that we need to be extremely + * careful with stack usage. + */ +static void +xfs_iext_destroy_node( + struct xfs_iext_node *node, + int level) +{ + int i; + + if (level > 1) { + for (i = 0; i < KEYS_PER_NODE; i++) { + if (node->keys[i] == XFS_IEXT_KEY_INVALID) + break; + xfs_iext_destroy_node(node->ptrs[i], level - 1); + } + } + + kmem_free(node); +} + +void +xfs_iext_destroy( + struct xfs_ifork *ifp) +{ + xfs_iext_destroy_node(ifp->if_u1.if_root, ifp->if_height); + + ifp->if_bytes = 0; + ifp->if_height = 0; + ifp->if_u1.if_root = NULL; +} diff --git a/fs/xfs/libxfs/xfs_inode_fork.c b/fs/xfs/libxfs/xfs_inode_fork.c index c5dbcae..20110a2 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.c +++ b/fs/xfs/libxfs/xfs_inode_fork.c @@ -331,6 +331,7 @@ xfs_iformat_extents( int size = nex * sizeof(xfs_bmbt_rec_t); struct xfs_iext_cursor icur; struct xfs_bmbt_rec *dp; + struct xfs_bmbt_irec new; int i; /* @@ -346,27 +347,22 @@ xfs_iformat_extents( } ifp->if_real_bytes = 0; - if (nex == 0) - ifp->if_u1.if_extents = NULL; - else - xfs_iext_add(ifp, 0, nex); - - ifp->if_bytes = size; + ifp->if_bytes = 0; + ifp->if_u1.if_root = NULL; + ifp->if_height = 0; if (size) { dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork); xfs_iext_first(ifp, &icur); for (i = 0; i < nex; i++, dp++) { - xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i); - if (!xfs_bmbt_validate_extent(mp, whichfork, dp)) { XFS_ERROR_REPORT("xfs_iformat_extents(2)", XFS_ERRLEVEL_LOW, mp); return -EFSCORRUPTED; } - ep->l0 = get_unaligned_be64(&dp->l0); - ep->l1 = get_unaligned_be64(&dp->l1); + xfs_bmbt_disk_get_all(dp, &new); + xfs_iext_insert(ip, &icur, 1, &new, state); trace_xfs_read_extent(ip, &icur, state, _THIS_IP_); xfs_iext_next(ifp, &icur); } @@ -435,6 +431,10 @@ xfs_iformat_btree( ifp->if_flags &= ~XFS_IFEXTENTS; ifp->if_flags |= XFS_IFBROOT; + ifp->if_real_bytes = 0; + ifp->if_bytes = 0; + ifp->if_u1.if_root = NULL; + ifp->if_height = 0; return 0; } @@ -662,14 +662,12 @@ xfs_idestroy_fork( ifp->if_u1.if_data = NULL; ifp->if_real_bytes = 0; } - } else if ((ifp->if_flags & XFS_IFEXTENTS) && - ((ifp->if_flags & XFS_IFEXTIREC) || - (ifp->if_u1.if_extents != NULL))) { - ASSERT(ifp->if_real_bytes != 0); + } else if ((ifp->if_flags & XFS_IFEXTENTS) && ifp->if_height) { xfs_iext_destroy(ifp); } - ASSERT(ifp->if_u1.if_extents == NULL); + ASSERT(ifp->if_real_bytes == 0); + if (whichfork == XFS_ATTR_FORK) { kmem_zone_free(xfs_ifork_zone, ip->i_afp); ip->i_afp = NULL; @@ -679,13 +677,6 @@ xfs_idestroy_fork( } } -/* Count number of incore extents based on if_bytes */ -xfs_extnum_t -xfs_iext_count(struct xfs_ifork *ifp) -{ - return ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t); -} - /* * Convert in-core extents to on-disk form * @@ -780,7 +771,6 @@ xfs_iflush_fork( !(iip->ili_fields & extflag[whichfork])); if ((iip->ili_fields & extflag[whichfork]) && (ifp->if_bytes > 0)) { - ASSERT(xfs_iext_get_ext(ifp, 0)); ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0); (void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp, whichfork); @@ -812,33 +802,6 @@ xfs_iflush_fork( } } -/* - * Return a pointer to the extent record at file index idx. - */ -xfs_bmbt_rec_host_t * -xfs_iext_get_ext( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_extnum_t idx) /* index of target extent */ -{ - ASSERT(idx >= 0); - ASSERT(idx < xfs_iext_count(ifp)); - - if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) { - return ifp->if_u1.if_ext_irec->er_extbuf; - } else if (ifp->if_flags & XFS_IFEXTIREC) { - xfs_ext_irec_t *erp; /* irec pointer */ - int erp_idx = 0; /* irec index */ - xfs_extnum_t page_idx = idx; /* ext index in target list */ - - erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0); - return &erp->er_extbuf[page_idx]; - } else if (ifp->if_bytes) { - return &ifp->if_u1.if_extents[idx]; - } else { - return NULL; - } -} - /* Convert bmap state flags to an inode fork. */ struct xfs_ifork * xfs_iext_state_to_fork( @@ -853,894 +816,6 @@ xfs_iext_state_to_fork( } /* - * Insert new item(s) into the extent records for incore inode - * fork 'ifp'. 'count' new items are inserted at index 'idx'. - */ -void -xfs_iext_insert( - xfs_inode_t *ip, /* incore inode pointer */ - struct xfs_iext_cursor *cur, - xfs_extnum_t count, /* number of inserted items */ - xfs_bmbt_irec_t *new, /* items to insert */ - int state) /* type of extent conversion */ -{ - xfs_ifork_t *ifp = xfs_iext_state_to_fork(ip, state); - xfs_extnum_t i; /* extent record index */ - - trace_xfs_iext_insert(ip, cur->idx, new, state, _RET_IP_); - - ASSERT(ifp->if_flags & XFS_IFEXTENTS); - xfs_iext_add(ifp, cur->idx, count); - for (i = 0; i < count; i++, new++) - xfs_bmbt_set_all(xfs_iext_get_ext(ifp, cur->idx + i), new); -} - -/* - * This is called when the amount of space required for incore file - * extents needs to be increased. The ext_diff parameter stores the - * number of new extents being added and the idx parameter contains - * the extent index where the new extents will be added. If the new - * extents are being appended, then we just need to (re)allocate and - * initialize the space. Otherwise, if the new extents are being - * inserted into the middle of the existing entries, a bit more work - * is required to make room for the new extents to be inserted. The - * caller is responsible for filling in the new extent entries upon - * return. - */ -void -xfs_iext_add( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_extnum_t idx, /* index to begin adding exts */ - int ext_diff) /* number of extents to add */ -{ - int byte_diff; /* new bytes being added */ - int new_size; /* size of extents after adding */ - xfs_extnum_t nextents; /* number of extents in file */ - - nextents = xfs_iext_count(ifp); - ASSERT((idx >= 0) && (idx <= nextents)); - byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t); - new_size = ifp->if_bytes + byte_diff; - - /* - * Use a linear (direct) extent list. - * If the extents are currently inside the inode, - * xfs_iext_realloc_direct will switch us from - * inline to direct extent allocation mode. - */ - if (nextents + ext_diff <= XFS_LINEAR_EXTS) { - xfs_iext_realloc_direct(ifp, new_size); - if (idx < nextents) { - memmove(&ifp->if_u1.if_extents[idx + ext_diff], - &ifp->if_u1.if_extents[idx], - (nextents - idx) * sizeof(xfs_bmbt_rec_t)); - memset(&ifp->if_u1.if_extents[idx], 0, byte_diff); - } - } - /* Indirection array */ - else { - xfs_ext_irec_t *erp; - int erp_idx = 0; - int page_idx = idx; - - ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS); - if (ifp->if_flags & XFS_IFEXTIREC) { - erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1); - } else { - xfs_iext_irec_init(ifp); - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - erp = ifp->if_u1.if_ext_irec; - } - /* Extents fit in target extent page */ - if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) { - if (page_idx < erp->er_extcount) { - memmove(&erp->er_extbuf[page_idx + ext_diff], - &erp->er_extbuf[page_idx], - (erp->er_extcount - page_idx) * - sizeof(xfs_bmbt_rec_t)); - memset(&erp->er_extbuf[page_idx], 0, byte_diff); - } - erp->er_extcount += ext_diff; - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); - } - /* Insert a new extent page */ - else if (erp) { - xfs_iext_add_indirect_multi(ifp, - erp_idx, page_idx, ext_diff); - } - /* - * If extent(s) are being appended to the last page in - * the indirection array and the new extent(s) don't fit - * in the page, then erp is NULL and erp_idx is set to - * the next index needed in the indirection array. - */ - else { - uint count = ext_diff; - - while (count) { - erp = xfs_iext_irec_new(ifp, erp_idx); - erp->er_extcount = min(count, XFS_LINEAR_EXTS); - count -= erp->er_extcount; - if (count) - erp_idx++; - } - } - } - ifp->if_bytes = new_size; -} - -/* - * This is called when incore extents are being added to the indirection - * array and the new extents do not fit in the target extent list. The - * erp_idx parameter contains the irec index for the target extent list - * in the indirection array, and the idx parameter contains the extent - * index within the list. The number of extents being added is stored - * in the count parameter. - * - * |-------| |-------| - * | | | | idx - number of extents before idx - * | idx | | count | - * | | | | count - number of extents being inserted at idx - * |-------| |-------| - * | count | | nex2 | nex2 - number of extents after idx + count - * |-------| |-------| - */ -void -xfs_iext_add_indirect_multi( - xfs_ifork_t *ifp, /* inode fork pointer */ - int erp_idx, /* target extent irec index */ - xfs_extnum_t idx, /* index within target list */ - int count) /* new extents being added */ -{ - int byte_diff; /* new bytes being added */ - xfs_ext_irec_t *erp; /* pointer to irec entry */ - xfs_extnum_t ext_diff; /* number of extents to add */ - xfs_extnum_t ext_cnt; /* new extents still needed */ - xfs_extnum_t nex2; /* extents after idx + count */ - xfs_bmbt_rec_t *nex2_ep = NULL; /* temp list for nex2 extents */ - int nlists; /* number of irec's (lists) */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - erp = &ifp->if_u1.if_ext_irec[erp_idx]; - nex2 = erp->er_extcount - idx; - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - - /* - * Save second part of target extent list - * (all extents past */ - if (nex2) { - byte_diff = nex2 * sizeof(xfs_bmbt_rec_t); - nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_NOFS); - memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff); - erp->er_extcount -= nex2; - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2); - memset(&erp->er_extbuf[idx], 0, byte_diff); - } - - /* - * Add the new extents to the end of the target - * list, then allocate new irec record(s) and - * extent buffer(s) as needed to store the rest - * of the new extents. - */ - ext_cnt = count; - ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount); - if (ext_diff) { - erp->er_extcount += ext_diff; - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); - ext_cnt -= ext_diff; - } - while (ext_cnt) { - erp_idx++; - erp = xfs_iext_irec_new(ifp, erp_idx); - ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS); - erp->er_extcount = ext_diff; - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff); - ext_cnt -= ext_diff; - } - - /* Add nex2 extents back to indirection array */ - if (nex2) { - xfs_extnum_t ext_avail; - int i; - - byte_diff = nex2 * sizeof(xfs_bmbt_rec_t); - ext_avail = XFS_LINEAR_EXTS - erp->er_extcount; - i = 0; - /* - * If nex2 extents fit in the current page, append - * nex2_ep after the new extents. - */ - if (nex2 <= ext_avail) { - i = erp->er_extcount; - } - /* - * Otherwise, check if space is available in the - * next page. - */ - else if ((erp_idx < nlists - 1) && - (nex2 <= (ext_avail = XFS_LINEAR_EXTS - - ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) { - erp_idx++; - erp++; - /* Create a hole for nex2 extents */ - memmove(&erp->er_extbuf[nex2], erp->er_extbuf, - erp->er_extcount * sizeof(xfs_bmbt_rec_t)); - } - /* - * Final choice, create a new extent page for - * nex2 extents. - */ - else { - erp_idx++; - erp = xfs_iext_irec_new(ifp, erp_idx); - } - memmove(&erp->er_extbuf[i], nex2_ep, byte_diff); - kmem_free(nex2_ep); - erp->er_extcount += nex2; - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2); - } -} - -/* - * This is called when the amount of space required for incore file - * extents needs to be decreased. The ext_diff parameter stores the - * number of extents to be removed and the idx parameter contains - * the extent index where the extents will be removed from. - * - * If the amount of space needed has decreased below the linear - * limit, XFS_IEXT_BUFSZ, then switch to using the contiguous - * extent array. Otherwise, use kmem_realloc() to adjust the - * size to what is needed. - */ -void -xfs_iext_remove( - xfs_inode_t *ip, /* incore inode pointer */ - struct xfs_iext_cursor *cur, - int ext_diff, /* number of extents to remove */ - int state) /* type of extent conversion */ -{ - xfs_ifork_t *ifp = xfs_iext_state_to_fork(ip, state); - xfs_extnum_t nextents; /* number of extents in file */ - int new_size; /* size of extents after removal */ - - trace_xfs_iext_remove(ip, cur, state, _RET_IP_); - - ASSERT(ext_diff > 0); - nextents = xfs_iext_count(ifp); - new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t); - - if (new_size == 0) { - xfs_iext_destroy(ifp); - } else if (ifp->if_flags & XFS_IFEXTIREC) { - xfs_iext_remove_indirect(ifp, cur->idx, ext_diff); - } else if (ifp->if_real_bytes) { - xfs_iext_remove_direct(ifp, cur->idx, ext_diff); - } - ifp->if_bytes = new_size; -} - -/* - * This removes ext_diff extents from a linear (direct) extent list, - * beginning at extent index idx. If the extents are being removed - * from the end of the list (ie. truncate) then we just need to re- - * allocate the list to remove the extra space. Otherwise, if the - * extents are being removed from the middle of the existing extent - * entries, then we first need to move the extent records beginning - * at idx + ext_diff up in the list to overwrite the records being - * removed, then remove the extra space via kmem_realloc. - */ -void -xfs_iext_remove_direct( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_extnum_t idx, /* index to begin removing exts */ - int ext_diff) /* number of extents to remove */ -{ - xfs_extnum_t nextents; /* number of extents in file */ - int new_size; /* size of extents after removal */ - - ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); - new_size = ifp->if_bytes - - (ext_diff * sizeof(xfs_bmbt_rec_t)); - nextents = xfs_iext_count(ifp); - - if (new_size == 0) { - xfs_iext_destroy(ifp); - return; - } - /* Move extents up in the list (if needed) */ - if (idx + ext_diff < nextents) { - memmove(&ifp->if_u1.if_extents[idx], - &ifp->if_u1.if_extents[idx + ext_diff], - (nextents - (idx + ext_diff)) * - sizeof(xfs_bmbt_rec_t)); - } - memset(&ifp->if_u1.if_extents[nextents - ext_diff], - 0, ext_diff * sizeof(xfs_bmbt_rec_t)); - /* - * Reallocate the direct extent list. If the extents - * will fit inside the inode then xfs_iext_realloc_direct - * will switch from direct to inline extent allocation - * mode for us. - */ - xfs_iext_realloc_direct(ifp, new_size); - ifp->if_bytes = new_size; -} - -/* - * This is called when incore extents are being removed from the - * indirection array and the extents being removed span multiple extent - * buffers. The idx parameter contains the file extent index where we - * want to begin removing extents, and the count parameter contains - * how many extents need to be removed. - * - * |-------| |-------| - * | nex1 | | | nex1 - number of extents before idx - * |-------| | count | - * | | | | count - number of extents being removed at idx - * | count | |-------| - * | | | nex2 | nex2 - number of extents after idx + count - * |-------| |-------| - */ -void -xfs_iext_remove_indirect( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_extnum_t idx, /* index to begin removing extents */ - int count) /* number of extents to remove */ -{ - xfs_ext_irec_t *erp; /* indirection array pointer */ - int erp_idx = 0; /* indirection array index */ - xfs_extnum_t ext_cnt; /* extents left to remove */ - xfs_extnum_t ext_diff; /* extents to remove in current list */ - xfs_extnum_t nex1; /* number of extents before idx */ - xfs_extnum_t nex2; /* extents after idx + count */ - int page_idx = idx; /* index in target extent list */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0); - ASSERT(erp != NULL); - nex1 = page_idx; - ext_cnt = count; - while (ext_cnt) { - nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0); - ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1)); - /* - * Check for deletion of entire list; - * xfs_iext_irec_remove() updates extent offsets. - */ - if (ext_diff == erp->er_extcount) { - xfs_iext_irec_remove(ifp, erp_idx); - ext_cnt -= ext_diff; - nex1 = 0; - if (ext_cnt) { - ASSERT(erp_idx < ifp->if_real_bytes / - XFS_IEXT_BUFSZ); - erp = &ifp->if_u1.if_ext_irec[erp_idx]; - nex1 = 0; - continue; - } else { - break; - } - } - /* Move extents up (if needed) */ - if (nex2) { - memmove(&erp->er_extbuf[nex1], - &erp->er_extbuf[nex1 + ext_diff], - nex2 * sizeof(xfs_bmbt_rec_t)); - } - /* Zero out rest of page */ - memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ - - ((nex1 + nex2) * sizeof(xfs_bmbt_rec_t)))); - /* Update remaining counters */ - erp->er_extcount -= ext_diff; - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff); - ext_cnt -= ext_diff; - nex1 = 0; - erp_idx++; - erp++; - } - ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t); - xfs_iext_irec_compact(ifp); -} - -/* - * Create, destroy, or resize a linear (direct) block of extents. - */ -void -xfs_iext_realloc_direct( - xfs_ifork_t *ifp, /* inode fork pointer */ - int new_size) /* new size of extents after adding */ -{ - int rnew_size; /* real new size of extents */ - - rnew_size = new_size; - - ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) || - ((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) && - (new_size != ifp->if_real_bytes))); - - /* Free extent records */ - if (new_size == 0) { - xfs_iext_destroy(ifp); - } else { - if (!is_power_of_2(new_size)){ - rnew_size = roundup_pow_of_two(new_size); - } - if (rnew_size != ifp->if_real_bytes) { - ifp->if_u1.if_extents = - kmem_realloc(ifp->if_u1.if_extents, - rnew_size, KM_NOFS); - } - if (rnew_size > ifp->if_real_bytes) { - memset(&ifp->if_u1.if_extents[ifp->if_bytes / - (uint)sizeof(xfs_bmbt_rec_t)], 0, - rnew_size - ifp->if_real_bytes); - } - } - ifp->if_real_bytes = rnew_size; - ifp->if_bytes = new_size; -} - -/* - * Resize an extent indirection array to new_size bytes. - */ -STATIC void -xfs_iext_realloc_indirect( - xfs_ifork_t *ifp, /* inode fork pointer */ - int new_size) /* new indirection array size */ -{ - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - ASSERT(ifp->if_real_bytes); - ASSERT((new_size >= 0) && - (new_size != ((ifp->if_real_bytes / XFS_IEXT_BUFSZ) * - sizeof(xfs_ext_irec_t)))); - if (new_size == 0) { - xfs_iext_destroy(ifp); - } else { - ifp->if_u1.if_ext_irec = - kmem_realloc(ifp->if_u1.if_ext_irec, new_size, KM_NOFS); - } -} - -/* - * Switch from indirection array to linear (direct) extent allocations. - */ -STATIC void -xfs_iext_indirect_to_direct( - xfs_ifork_t *ifp) /* inode fork pointer */ -{ - xfs_bmbt_rec_host_t *ep; /* extent record pointer */ - xfs_extnum_t nextents; /* number of extents in file */ - int size; /* size of file extents */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nextents = xfs_iext_count(ifp); - ASSERT(nextents <= XFS_LINEAR_EXTS); - size = nextents * sizeof(xfs_bmbt_rec_t); - - xfs_iext_irec_compact_pages(ifp); - ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ); - - ep = ifp->if_u1.if_ext_irec->er_extbuf; - kmem_free(ifp->if_u1.if_ext_irec); - ifp->if_flags &= ~XFS_IFEXTIREC; - ifp->if_u1.if_extents = ep; - ifp->if_bytes = size; - if (nextents < XFS_LINEAR_EXTS) { - xfs_iext_realloc_direct(ifp, size); - } -} - -/* - * Remove all records from the indirection array. - */ -STATIC void -xfs_iext_irec_remove_all( - struct xfs_ifork *ifp) -{ - int nlists; - int i; - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - for (i = 0; i < nlists; i++) - kmem_free(ifp->if_u1.if_ext_irec[i].er_extbuf); - kmem_free(ifp->if_u1.if_ext_irec); - ifp->if_flags &= ~XFS_IFEXTIREC; -} - -/* - * Free incore file extents. - */ -void -xfs_iext_destroy( - xfs_ifork_t *ifp) /* inode fork pointer */ -{ - if (ifp->if_flags & XFS_IFEXTIREC) { - xfs_iext_irec_remove_all(ifp); - } else if (ifp->if_real_bytes) { - kmem_free(ifp->if_u1.if_extents); - } - ifp->if_u1.if_extents = NULL; - ifp->if_real_bytes = 0; - ifp->if_bytes = 0; -} - -/* - * Return a pointer to the extent record for file system block bno. - */ -xfs_bmbt_rec_host_t * /* pointer to found extent record */ -xfs_iext_bno_to_ext( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_fileoff_t bno, /* block number to search for */ - xfs_extnum_t *idxp) /* index of target extent */ -{ - xfs_bmbt_rec_host_t *base; /* pointer to first extent */ - xfs_filblks_t blockcount = 0; /* number of blocks in extent */ - xfs_bmbt_rec_host_t *ep = NULL; /* pointer to target extent */ - xfs_ext_irec_t *erp = NULL; /* indirection array pointer */ - int high; /* upper boundary in search */ - xfs_extnum_t idx = 0; /* index of target extent */ - int low; /* lower boundary in search */ - xfs_extnum_t nextents; /* number of file extents */ - xfs_fileoff_t startoff = 0; /* start offset of extent */ - - nextents = xfs_iext_count(ifp); - if (nextents == 0) { - *idxp = 0; - return NULL; - } - low = 0; - if (ifp->if_flags & XFS_IFEXTIREC) { - /* Find target extent list */ - int erp_idx = 0; - erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx); - base = erp->er_extbuf; - high = erp->er_extcount - 1; - } else { - base = ifp->if_u1.if_extents; - high = nextents - 1; - } - /* Binary search extent records */ - while (low <= high) { - idx = (low + high) >> 1; - ep = base + idx; - startoff = xfs_bmbt_get_startoff(ep); - blockcount = xfs_bmbt_get_blockcount(ep); - if (bno < startoff) { - high = idx - 1; - } else if (bno >= startoff + blockcount) { - low = idx + 1; - } else { - /* Convert back to file-based extent index */ - if (ifp->if_flags & XFS_IFEXTIREC) { - idx += erp->er_extoff; - } - *idxp = idx; - return ep; - } - } - /* Convert back to file-based extent index */ - if (ifp->if_flags & XFS_IFEXTIREC) { - idx += erp->er_extoff; - } - if (bno >= startoff + blockcount) { - if (++idx == nextents) { - ep = NULL; - } else { - ep = xfs_iext_get_ext(ifp, idx); - } - } - *idxp = idx; - return ep; -} - -/* - * Return a pointer to the indirection array entry containing the - * extent record for filesystem block bno. Store the index of the - * target irec in *erp_idxp. - */ -xfs_ext_irec_t * /* pointer to found extent record */ -xfs_iext_bno_to_irec( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_fileoff_t bno, /* block number to search for */ - int *erp_idxp) /* irec index of target ext list */ -{ - xfs_ext_irec_t *erp = NULL; /* indirection array pointer */ - xfs_ext_irec_t *erp_next; /* next indirection array entry */ - int erp_idx; /* indirection array index */ - int nlists; /* number of extent irec's (lists) */ - int high; /* binary search upper limit */ - int low; /* binary search lower limit */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - erp_idx = 0; - low = 0; - high = nlists - 1; - while (low <= high) { - erp_idx = (low + high) >> 1; - erp = &ifp->if_u1.if_ext_irec[erp_idx]; - erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL; - if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) { - high = erp_idx - 1; - } else if (erp_next && bno >= - xfs_bmbt_get_startoff(erp_next->er_extbuf)) { - low = erp_idx + 1; - } else { - break; - } - } - *erp_idxp = erp_idx; - return erp; -} - -/* - * Return a pointer to the indirection array entry containing the - * extent record at file extent index *idxp. Store the index of the - * target irec in *erp_idxp and store the page index of the target - * extent record in *idxp. - */ -xfs_ext_irec_t * -xfs_iext_idx_to_irec( - xfs_ifork_t *ifp, /* inode fork pointer */ - xfs_extnum_t *idxp, /* extent index (file -> page) */ - int *erp_idxp, /* pointer to target irec */ - int realloc) /* new bytes were just added */ -{ - xfs_ext_irec_t *prev; /* pointer to previous irec */ - xfs_ext_irec_t *erp = NULL; /* pointer to current irec */ - int erp_idx; /* indirection array index */ - int nlists; /* number of irec's (ex lists) */ - int high; /* binary search upper limit */ - int low; /* binary search lower limit */ - xfs_extnum_t page_idx = *idxp; /* extent index in target list */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - ASSERT(page_idx >= 0); - ASSERT(page_idx <= xfs_iext_count(ifp)); - ASSERT(page_idx < xfs_iext_count(ifp) || realloc); - - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - erp_idx = 0; - low = 0; - high = nlists - 1; - - /* Binary search extent irec's */ - while (low <= high) { - erp_idx = (low + high) >> 1; - erp = &ifp->if_u1.if_ext_irec[erp_idx]; - prev = erp_idx > 0 ? erp - 1 : NULL; - if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff && - realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) { - high = erp_idx - 1; - } else if (page_idx > erp->er_extoff + erp->er_extcount || - (page_idx == erp->er_extoff + erp->er_extcount && - !realloc)) { - low = erp_idx + 1; - } else if (page_idx == erp->er_extoff + erp->er_extcount && - erp->er_extcount == XFS_LINEAR_EXTS) { - ASSERT(realloc); - page_idx = 0; - erp_idx++; - erp = erp_idx < nlists ? erp + 1 : NULL; - break; - } else { - page_idx -= erp->er_extoff; - break; - } - } - *idxp = page_idx; - *erp_idxp = erp_idx; - return erp; -} - -/* - * Allocate and initialize an indirection array once the space needed - * for incore extents increases above XFS_IEXT_BUFSZ. - */ -void -xfs_iext_irec_init( - xfs_ifork_t *ifp) /* inode fork pointer */ -{ - xfs_ext_irec_t *erp; /* indirection array pointer */ - xfs_extnum_t nextents; /* number of extents in file */ - - ASSERT(!(ifp->if_flags & XFS_IFEXTIREC)); - nextents = xfs_iext_count(ifp); - ASSERT(nextents <= XFS_LINEAR_EXTS); - - erp = kmem_alloc(sizeof(xfs_ext_irec_t), KM_NOFS); - - if (nextents == 0) { - ifp->if_u1.if_extents = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS); - } else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) { - xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ); - } - erp->er_extbuf = ifp->if_u1.if_extents; - erp->er_extcount = nextents; - erp->er_extoff = 0; - - ifp->if_flags |= XFS_IFEXTIREC; - ifp->if_real_bytes = XFS_IEXT_BUFSZ; - ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t); - ifp->if_u1.if_ext_irec = erp; - - return; -} - -/* - * Allocate and initialize a new entry in the indirection array. - */ -xfs_ext_irec_t * -xfs_iext_irec_new( - xfs_ifork_t *ifp, /* inode fork pointer */ - int erp_idx) /* index for new irec */ -{ - xfs_ext_irec_t *erp; /* indirection array pointer */ - int i; /* loop counter */ - int nlists; /* number of irec's (ex lists) */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - - /* Resize indirection array */ - xfs_iext_realloc_indirect(ifp, ++nlists * - sizeof(xfs_ext_irec_t)); - /* - * Move records down in the array so the - * new page can use erp_idx. - */ - erp = ifp->if_u1.if_ext_irec; - for (i = nlists - 1; i > erp_idx; i--) { - memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t)); - } - ASSERT(i == erp_idx); - - /* Initialize new extent record */ - erp = ifp->if_u1.if_ext_irec; - erp[erp_idx].er_extbuf = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS); - ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ; - memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ); - erp[erp_idx].er_extcount = 0; - erp[erp_idx].er_extoff = erp_idx > 0 ? - erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0; - return (&erp[erp_idx]); -} - -/* - * Remove a record from the indirection array. - */ -void -xfs_iext_irec_remove( - xfs_ifork_t *ifp, /* inode fork pointer */ - int erp_idx) /* irec index to remove */ -{ - xfs_ext_irec_t *erp; /* indirection array pointer */ - int i; /* loop counter */ - int nlists; /* number of irec's (ex lists) */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - erp = &ifp->if_u1.if_ext_irec[erp_idx]; - if (erp->er_extbuf) { - xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, - -erp->er_extcount); - kmem_free(erp->er_extbuf); - } - /* Compact extent records */ - erp = ifp->if_u1.if_ext_irec; - for (i = erp_idx; i < nlists - 1; i++) { - memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t)); - } - /* - * Manually free the last extent record from the indirection - * array. A call to xfs_iext_realloc_indirect() with a size - * of zero would result in a call to xfs_iext_destroy() which - * would in turn call this function again, creating a nasty - * infinite loop. - */ - if (--nlists) { - xfs_iext_realloc_indirect(ifp, - nlists * sizeof(xfs_ext_irec_t)); - } else { - kmem_free(ifp->if_u1.if_ext_irec); - } - ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ; -} - -/* - * This is called to clean up large amounts of unused memory allocated - * by the indirection array. Before compacting anything though, verify - * that the indirection array is still needed and switch back to the - * linear extent list (or even the inline buffer) if possible. The - * compaction policy is as follows: - * - * Full Compaction: Extents fit into a single page (or inline buffer) - * Partial Compaction: Extents occupy less than 50% of allocated space - * No Compaction: Extents occupy at least 50% of allocated space - */ -void -xfs_iext_irec_compact( - xfs_ifork_t *ifp) /* inode fork pointer */ -{ - xfs_extnum_t nextents; /* number of extents in file */ - int nlists; /* number of irec's (ex lists) */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - nextents = xfs_iext_count(ifp); - - if (nextents == 0) { - xfs_iext_destroy(ifp); - } else if (nextents <= XFS_LINEAR_EXTS) { - xfs_iext_indirect_to_direct(ifp); - } else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) { - xfs_iext_irec_compact_pages(ifp); - } -} - -/* - * Combine extents from neighboring extent pages. - */ -void -xfs_iext_irec_compact_pages( - xfs_ifork_t *ifp) /* inode fork pointer */ -{ - xfs_ext_irec_t *erp, *erp_next;/* pointers to irec entries */ - int erp_idx = 0; /* indirection array index */ - int nlists; /* number of irec's (ex lists) */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - while (erp_idx < nlists - 1) { - erp = &ifp->if_u1.if_ext_irec[erp_idx]; - erp_next = erp + 1; - if (erp_next->er_extcount <= - (XFS_LINEAR_EXTS - erp->er_extcount)) { - memcpy(&erp->er_extbuf[erp->er_extcount], - erp_next->er_extbuf, erp_next->er_extcount * - sizeof(xfs_bmbt_rec_t)); - erp->er_extcount += erp_next->er_extcount; - /* - * Free page before removing extent record - * so er_extoffs don't get modified in - * xfs_iext_irec_remove. - */ - kmem_free(erp_next->er_extbuf); - erp_next->er_extbuf = NULL; - xfs_iext_irec_remove(ifp, erp_idx + 1); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - } else { - erp_idx++; - } - } -} - -/* - * This is called to update the er_extoff field in the indirection - * array when extents have been added or removed from one of the - * extent lists. erp_idx contains the irec index to begin updating - * at and ext_diff contains the number of extents that were added - * or removed. - */ -void -xfs_iext_irec_update_extoffs( - xfs_ifork_t *ifp, /* inode fork pointer */ - int erp_idx, /* irec index to update */ - int ext_diff) /* number of new extents */ -{ - int i; /* loop counter */ - int nlists; /* number of irec's (ex lists */ - - ASSERT(ifp->if_flags & XFS_IFEXTIREC); - nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ; - for (i = erp_idx; i < nlists; i++) { - ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff; - } -} - -/* * Initialize an inode's copy-on-write fork. */ void @@ -1756,87 +831,3 @@ xfs_ifork_init_cow( ip->i_cformat = XFS_DINODE_FMT_EXTENTS; ip->i_cnextents = 0; } - -/* - * Lookup the extent covering bno. - * - * If there is an extent covering bno return the extent index, and store the - * expanded extent structure in *gotp, and the extent cursor in *cur. - * If there is no extent covering bno, but there is an extent after it (e.g. - * it lies in a hole) return that extent in *gotp and its cursor in *cur - * instead. - * If bno is beyond the last extent return false, and return an invalid - * cursor value. - */ -bool -xfs_iext_lookup_extent( - struct xfs_inode *ip, - struct xfs_ifork *ifp, - xfs_fileoff_t bno, - struct xfs_iext_cursor *cur, - struct xfs_bmbt_irec *gotp) -{ - struct xfs_bmbt_rec_host *ep; - - XFS_STATS_INC(ip->i_mount, xs_look_exlist); - - ep = xfs_iext_bno_to_ext(ifp, bno, &cur->idx); - if (!ep) - return false; - xfs_bmbt_get_all(ep, gotp); - return true; -} - -/* - * Returns the last extent before end, and if this extent doesn't cover - * end, update end to the end of the extent. - */ -bool -xfs_iext_lookup_extent_before( - struct xfs_inode *ip, - struct xfs_ifork *ifp, - xfs_fileoff_t *end, - struct xfs_iext_cursor *cur, - struct xfs_bmbt_irec *gotp) -{ - if (xfs_iext_lookup_extent(ip, ifp, *end - 1, cur, gotp) && - gotp->br_startoff <= *end - 1) - return true; - if (!xfs_iext_prev_extent(ifp, cur, gotp)) - return false; - *end = gotp->br_startoff + gotp->br_blockcount; - return true; -} - -/* - * Return true if the cursor points at an extent and return the extent structure - * in gotp. Else return false. - */ -bool -xfs_iext_get_extent( - struct xfs_ifork *ifp, - struct xfs_iext_cursor *cur, - struct xfs_bmbt_irec *gotp) -{ - if (cur->idx < 0 || cur->idx >= xfs_iext_count(ifp)) - return false; - xfs_bmbt_get_all(xfs_iext_get_ext(ifp, cur->idx), gotp); - return true; -} - -void -xfs_iext_update_extent( - struct xfs_inode *ip, - int state, - struct xfs_iext_cursor *cur, - struct xfs_bmbt_irec *gotp) -{ - struct xfs_ifork *ifp = xfs_iext_state_to_fork(ip, state); - - ASSERT(cur->idx >= 0); - ASSERT(cur->idx < xfs_iext_count(ifp)); - - trace_xfs_bmap_pre_update(ip, cur, state, _RET_IP_); - xfs_bmbt_set_all(xfs_iext_get_ext(ifp, cur->idx), gotp); - trace_xfs_bmap_post_update(ip, cur, state, _RET_IP_); -} diff --git a/fs/xfs/libxfs/xfs_inode_fork.h b/fs/xfs/libxfs/xfs_inode_fork.h index cf9885a..1842170 100644 --- a/fs/xfs/libxfs/xfs_inode_fork.h +++ b/fs/xfs/libxfs/xfs_inode_fork.h @@ -22,44 +22,17 @@ struct xfs_inode_log_item; struct xfs_dinode; /* - * The following xfs_ext_irec_t struct introduces a second (top) level - * to the in-core extent allocation scheme. These structs are allocated - * in a contiguous block, creating an indirection array where each entry - * (irec) contains a pointer to a buffer of in-core extent records which - * it manages. Each extent buffer is 4k in size, since 4k is the system - * page size on Linux i386 and systems with larger page sizes don't seem - * to gain much, if anything, by using their native page size as the - * extent buffer size. Also, using 4k extent buffers everywhere provides - * a consistent interface for CXFS across different platforms. - * - * There is currently no limit on the number of irec's (extent lists) - * allowed, so heavily fragmented files may require an indirection array - * which spans multiple system pages of memory. The number of extents - * which would require this amount of contiguous memory is very large - * and should not cause problems in the foreseeable future. However, - * if the memory needed for the contiguous array ever becomes a problem, - * it is possible that a third level of indirection may be required. - */ -typedef struct xfs_ext_irec { - xfs_bmbt_rec_host_t *er_extbuf; /* block of extent records */ - xfs_extnum_t er_extoff; /* extent offset in file */ - xfs_extnum_t er_extcount; /* number of extents in page/block */ -} xfs_ext_irec_t; - -/* * File incore extent information, present for each of data & attr forks. */ -#define XFS_IEXT_BUFSZ 4096 -#define XFS_LINEAR_EXTS (XFS_IEXT_BUFSZ / (uint)sizeof(xfs_bmbt_rec_t)) typedef struct xfs_ifork { int if_bytes; /* bytes in if_u1 */ int if_real_bytes; /* bytes allocated in if_u1 */ struct xfs_btree_block *if_broot; /* file's incore btree root */ short if_broot_bytes; /* bytes allocated for root */ unsigned char if_flags; /* per-fork flags */ + int if_height; /* height of the extent tree */ union { - xfs_bmbt_rec_host_t *if_extents;/* linear map file exts */ - xfs_ext_irec_t *if_ext_irec; /* irec map file exts */ + void *if_root; /* extent tree root */ char *if_data; /* inline file data */ } if_u1; } xfs_ifork_t; @@ -70,7 +43,6 @@ typedef struct xfs_ifork { #define XFS_IFINLINE 0x01 /* Inline data is read in */ #define XFS_IFEXTENTS 0x02 /* All extent pointers are read in */ #define XFS_IFBROOT 0x04 /* i_broot points to the bmap b-tree root */ -#define XFS_IFEXTIREC 0x08 /* Indirection array of extent blocks */ /* * Fork handling. @@ -140,35 +112,12 @@ int xfs_iextents_copy(struct xfs_inode *, struct xfs_bmbt_rec *, int); void xfs_init_local_fork(struct xfs_inode *, int, const void *, int); -struct xfs_bmbt_rec_host * - xfs_iext_get_ext(struct xfs_ifork *, xfs_extnum_t); -xfs_extnum_t xfs_iext_count(struct xfs_ifork *); +xfs_extnum_t xfs_iext_count(struct xfs_ifork *ifp); void xfs_iext_insert(struct xfs_inode *, struct xfs_iext_cursor *cur, xfs_extnum_t, struct xfs_bmbt_irec *, int); -void xfs_iext_add(struct xfs_ifork *, xfs_extnum_t, int); -void xfs_iext_add_indirect_multi(struct xfs_ifork *, int, - xfs_extnum_t, int); void xfs_iext_remove(struct xfs_inode *, struct xfs_iext_cursor *, int, int); -void xfs_iext_remove_direct(struct xfs_ifork *, xfs_extnum_t, int); -void xfs_iext_remove_indirect(struct xfs_ifork *, xfs_extnum_t, int); -void xfs_iext_realloc_direct(struct xfs_ifork *, int); void xfs_iext_destroy(struct xfs_ifork *); -struct xfs_bmbt_rec_host * - xfs_iext_bno_to_ext(struct xfs_ifork *, xfs_fileoff_t, int *); -struct xfs_ext_irec * - xfs_iext_bno_to_irec(struct xfs_ifork *, xfs_fileoff_t, int *); -struct xfs_ext_irec * - xfs_iext_idx_to_irec(struct xfs_ifork *, xfs_extnum_t *, int *, - int); -void xfs_iext_irec_init(struct xfs_ifork *); -struct xfs_ext_irec * - xfs_iext_irec_new(struct xfs_ifork *, int); -void xfs_iext_irec_remove(struct xfs_ifork *, int); -void xfs_iext_irec_compact(struct xfs_ifork *); -void xfs_iext_irec_compact_pages(struct xfs_ifork *); -void xfs_iext_irec_compact_full(struct xfs_ifork *); -void xfs_iext_irec_update_extoffs(struct xfs_ifork *, int, int); bool xfs_iext_lookup_extent(struct xfs_inode *ip, struct xfs_ifork *ifp, xfs_fileoff_t bno, @@ -185,29 +134,10 @@ void xfs_iext_update_extent(struct xfs_inode *ip, int state, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp); -static inline void xfs_iext_first(struct xfs_ifork *ifp, - struct xfs_iext_cursor *cur) -{ - cur->idx = 0; -} - -static inline void xfs_iext_last(struct xfs_ifork *ifp, - struct xfs_iext_cursor *cur) -{ - cur->idx = xfs_iext_count(ifp) - 1; -} - -static inline void xfs_iext_next(struct xfs_ifork *ifp, - struct xfs_iext_cursor *cur) -{ - cur->idx++; -} - -static inline void xfs_iext_prev(struct xfs_ifork *ifp, - struct xfs_iext_cursor *cur) -{ - cur->idx--; -} +void xfs_iext_first(struct xfs_ifork *, struct xfs_iext_cursor *); +void xfs_iext_last(struct xfs_ifork *, struct xfs_iext_cursor *); +void xfs_iext_next(struct xfs_ifork *, struct xfs_iext_cursor *); +void xfs_iext_prev(struct xfs_ifork *, struct xfs_iext_cursor *); static inline bool xfs_iext_next_extent(struct xfs_ifork *ifp, struct xfs_iext_cursor *cur, struct xfs_bmbt_irec *gotp) diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h index 5da6382..9838780 100644 --- a/fs/xfs/libxfs/xfs_types.h +++ b/fs/xfs/libxfs/xfs_types.h @@ -143,7 +143,8 @@ typedef uint32_t xfs_dqid_t; #define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1) struct xfs_iext_cursor { - xfs_extnum_t idx; + struct xfs_iext_leaf *leaf; + int pos; }; #endif /* __XFS_TYPES_H__ */ diff --git a/fs/xfs/scrub/bmap.c b/fs/xfs/scrub/bmap.c index be0bc11..39fb2a5 100644 --- a/fs/xfs/scrub/bmap.c +++ b/fs/xfs/scrub/bmap.c @@ -168,7 +168,6 @@ xfs_scrub_bmapbt_rec( struct xfs_scrub_btree *bs, union xfs_btree_rec *rec) { - struct xfs_bmbt_rec_host ihost; struct xfs_bmbt_irec irec; struct xfs_scrub_bmap_info *info = bs->private; struct xfs_inode *ip = bs->cur->bc_private.b.ip; @@ -193,9 +192,7 @@ xfs_scrub_bmapbt_rec( } /* Set up the in-core record and scrub it. */ - ihost.l0 = be64_to_cpu(rec->bmbt.l0); - ihost.l1 = be64_to_cpu(rec->bmbt.l1); - xfs_bmbt_get_all(&ihost, &irec); + xfs_bmbt_disk_get_all(&rec->bmbt, &irec); return xfs_scrub_bmap_extent(ip, bs->cur, info, &irec); } diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c index 0249782..edd9835 100644 --- a/fs/xfs/xfs_inode.c +++ b/fs/xfs/xfs_inode.c @@ -934,7 +934,7 @@ xfs_ialloc( ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS; ip->i_df.if_flags = XFS_IFEXTENTS; ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0; - ip->i_df.if_u1.if_extents = NULL; + ip->i_df.if_u1.if_root = NULL; break; default: ASSERT(0); diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c index eb6f4f7..6ee5c3b 100644 --- a/fs/xfs/xfs_inode_item.c +++ b/fs/xfs/xfs_inode_item.c @@ -162,7 +162,6 @@ xfs_inode_item_format_data_fork( ip->i_df.if_bytes > 0) { struct xfs_bmbt_rec *p; - ASSERT(ip->i_df.if_u1.if_extents != NULL); ASSERT(xfs_iext_count(&ip->i_df) > 0); p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IEXT); @@ -252,7 +251,6 @@ xfs_inode_item_format_attr_fork( ASSERT(xfs_iext_count(ip->i_afp) == ip->i_d.di_anextents); - ASSERT(ip->i_afp->if_u1.if_extents != NULL); p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_EXT); data_bytes = xfs_iextents_copy(ip, p, XFS_ATTR_FORK); diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h index 667bfce..515ba042 100644 --- a/fs/xfs/xfs_trace.h +++ b/fs/xfs/xfs_trace.h @@ -218,45 +218,6 @@ TRACE_EVENT(xfs_attr_list_node_descend, __entry->bt_before) ); -TRACE_EVENT(xfs_iext_insert, - TP_PROTO(struct xfs_inode *ip, xfs_extnum_t idx, - struct xfs_bmbt_irec *r, int state, unsigned long caller_ip), - TP_ARGS(ip, idx, r, state, caller_ip), - TP_STRUCT__entry( - __field(dev_t, dev) - __field(xfs_ino_t, ino) - __field(xfs_extnum_t, idx) - __field(xfs_fileoff_t, startoff) - __field(xfs_fsblock_t, startblock) - __field(xfs_filblks_t, blockcount) - __field(xfs_exntst_t, state) - __field(int, bmap_state) - __field(unsigned long, caller_ip) - ), - TP_fast_assign( - __entry->dev = VFS_I(ip)->i_sb->s_dev; - __entry->ino = ip->i_ino; - __entry->idx = idx; - __entry->startoff = r->br_startoff; - __entry->startblock = r->br_startblock; - __entry->blockcount = r->br_blockcount; - __entry->state = r->br_state; - __entry->bmap_state = state; - __entry->caller_ip = caller_ip; - ), - TP_printk("dev %d:%d ino 0x%llx state %s idx %ld " - "offset %lld block %lld count %lld flag %d caller %ps", - MAJOR(__entry->dev), MINOR(__entry->dev), - __entry->ino, - __print_flags(__entry->bmap_state, "|", XFS_BMAP_EXT_FLAGS), - (long)__entry->idx, - __entry->startoff, - (int64_t)__entry->startblock, - __entry->blockcount, - __entry->state, - (char *)__entry->caller_ip) -); - DECLARE_EVENT_CLASS(xfs_bmap_class, TP_PROTO(struct xfs_inode *ip, struct xfs_iext_cursor *cur, int state, unsigned long caller_ip), @@ -264,7 +225,8 @@ DECLARE_EVENT_CLASS(xfs_bmap_class, TP_STRUCT__entry( __field(dev_t, dev) __field(xfs_ino_t, ino) - __field(xfs_extnum_t, idx) + __field(void *, leaf); + __field(int, pos); __field(xfs_fileoff_t, startoff) __field(xfs_fsblock_t, startblock) __field(xfs_filblks_t, blockcount) @@ -280,7 +242,8 @@ DECLARE_EVENT_CLASS(xfs_bmap_class, xfs_iext_get_extent(ifp, cur, &r); __entry->dev = VFS_I(ip)->i_sb->s_dev; __entry->ino = ip->i_ino; - __entry->idx = cur->idx; + __entry->leaf = cur->leaf; + __entry->pos = cur->pos; __entry->startoff = r.br_startoff; __entry->startblock = r.br_startblock; __entry->blockcount = r.br_blockcount; @@ -288,12 +251,13 @@ DECLARE_EVENT_CLASS(xfs_bmap_class, __entry->bmap_state = state; __entry->caller_ip = caller_ip; ), - TP_printk("dev %d:%d ino 0x%llx state %s idx %ld " + TP_printk("dev %d:%d ino 0x%llx state %s cur 0x%p/%d " "offset %lld block %lld count %lld flag %d caller %ps", MAJOR(__entry->dev), MINOR(__entry->dev), __entry->ino, __print_flags(__entry->bmap_state, "|", XFS_BMAP_EXT_FLAGS), - (long)__entry->idx, + __entry->leaf, + __entry->pos, __entry->startoff, (int64_t)__entry->startblock, __entry->blockcount, @@ -306,6 +270,7 @@ DEFINE_EVENT(xfs_bmap_class, name, \ TP_PROTO(struct xfs_inode *ip, struct xfs_iext_cursor *cur, int state, \ unsigned long caller_ip), \ TP_ARGS(ip, cur, state, caller_ip)) +DEFINE_BMAP_EVENT(xfs_iext_insert); DEFINE_BMAP_EVENT(xfs_iext_remove); DEFINE_BMAP_EVENT(xfs_bmap_pre_update); DEFINE_BMAP_EVENT(xfs_bmap_post_update); |
