* BerkeleyDB API, but much simplified.
*/
/*
- * Copyright 2011-2014 Howard Chu, Symas Corp.
+ * Copyright 2011-2015 Howard Chu, Symas Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
#define CACHEFLUSH(addr, bytes, cache)
#endif
+#if defined(__linux) && !defined(MDB_FDATASYNC_WORKS)
+/** fdatasync is broken on ext3/ext4fs on older kernels, see
+ * description in #mdb_env_open2 comments. You can safely
+ * define MDB_FDATASYNC_WORKS if this code will only be run
+ * on kernels 3.6 and newer.
+ */
+#define BROKEN_FDATASYNC
+#endif
+
#include <errno.h>
#include <limits.h>
#include <stddef.h>
#include <time.h>
#include <unistd.h>
+#if defined(__sun) || defined(ANDROID)
+/* Most platforms have posix_memalign, older may only have memalign */
+#define HAVE_MEMALIGN 1
+#include <malloc.h>
+#endif
+
#if !(defined(BYTE_ORDER) || defined(__BYTE_ORDER))
#include <netinet/in.h>
#include <resolv.h> /* defines BYTE_ORDER on HPUX and Solaris */
* started from so we can avoid overwriting any data used in that
* particular version.
*/
- txnid_t mrb_txnid;
+ volatile txnid_t mrb_txnid;
/** The process ID of the process owning this reader txn. */
- MDB_PID_T mrb_pid;
+ volatile MDB_PID_T mrb_pid;
/** The thread ID of the thread owning this txn. */
- MDB_THR_T mrb_tid;
+ volatile MDB_THR_T mrb_tid;
} MDB_rxbody;
/** The actual reader record, with cacheline padding. */
* This is recorded here only for convenience; the value can always
* be determined by reading the main database meta pages.
*/
- txnid_t mtb_txnid;
+ volatile txnid_t mtb_txnid;
/** The number of slots that have been used in the reader table.
* This always records the maximum count, it is not decremented
* when readers release their slots.
*/
- unsigned mtb_numreaders;
+ volatile unsigned mtb_numreaders;
} MDB_txbody;
/** The actual reader table definition. */
/** The number of overflow pages needed to store the given size. */
#define OVPAGES(size, psize) ((PAGEHDRSZ-1 + (size)) / (psize) + 1)
- /** Link in #MDB_txn.%mt_loose_pages list */
+ /** Link in #MDB_txn.%mt_loose_pgs list */
#define NEXT_LOOSE_PAGE(p) (*(MDB_page **)((p) + 2))
/** Header for a single key/data pair within a page.
/** Stamp identifying this as an LMDB file. It must be set
* to #MDB_MAGIC. */
uint32_t mm_magic;
- /** Version number of this lock file. Must be set to #MDB_DATA_VERSION. */
+ /** Version number of this file. Must be set to #MDB_DATA_VERSION. */
uint32_t mm_version;
void *mm_address; /**< address for fixed mapping */
size_t mm_mapsize; /**< size of mmap region */
/** Any persistent environment flags. @ref mdb_env */
#define mm_flags mm_dbs[0].md_flags
pgno_t mm_last_pg; /**< last used page in file */
- txnid_t mm_txnid; /**< txnid that committed this page */
+ volatile txnid_t mm_txnid; /**< txnid that committed this page */
} MDB_meta;
/** Buffer for a stack-allocated meta page.
* in this transaction, linked through #NEXT_LOOSE_PAGE(page).
*/
MDB_page *mt_loose_pgs;
+ /* #Number of loose pages (#mt_loose_pgs) */
+ int mt_loose_count;
/** The sorted list of dirty pages we temporarily wrote to disk
* because the dirty list was full. page numbers in here are
* shifted left by 1, deleted slots have the LSB set.
#define MDB_ENV_ACTIVE 0x20000000U
/** me_txkey is set */
#define MDB_ENV_TXKEY 0x10000000U
+ /** fdatasync is unreliable */
+#define MDB_FSYNCONLY 0x08000000U
uint32_t me_flags; /**< @ref mdb_env */
unsigned int me_psize; /**< DB page size, inited from me_os_psize */
unsigned int me_os_psize; /**< OS page size, from #GET_PAGESIZE */
MDB_meta *me_metas[2]; /**< pointers to the two meta pages */
void *me_pbuf; /**< scratch area for DUPSORT put() */
MDB_txn *me_txn; /**< current write transaction */
+ MDB_txn *me_txn0; /**< prealloc'd write transaction */
size_t me_mapsize; /**< size of the data memory map */
off_t me_size; /**< current file size */
pgno_t me_maxpg; /**< me_mapsize / me_psize */
uint16_t *me_dbflags; /**< array of flags from MDB_db.md_flags */
unsigned int *me_dbiseqs; /**< array of dbi sequence numbers */
pthread_key_t me_txkey; /**< thread-key for readers */
+ txnid_t me_pgoldest; /**< ID of oldest reader last time we looked */
MDB_pgstate me_pgstate; /**< state of old pages from freeDB */
# define me_pglast me_pgstate.mf_pglast
# define me_pghead me_pgstate.mf_pghead
buf[0] = 0;
FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, err, 0, ptr, sizeof(buf), pad);
+ NULL, err, 0, ptr, sizeof(buf), (va_list *)pad);
return ptr;
#else
return strerror(err);
{
int loose = 0;
pgno_t pgno = mp->mp_pgno;
+ MDB_txn *txn = mc->mc_txn;
if ((mp->mp_flags & P_DIRTY) && mc->mc_dbi != FREE_DBI) {
- if (mc->mc_txn->mt_parent) {
- MDB_ID2 *dl = mc->mc_txn->mt_u.dirty_list;
+ if (txn->mt_parent) {
+ MDB_ID2 *dl = txn->mt_u.dirty_list;
/* If txn has a parent, make sure the page is in our
* dirty list.
*/
if (x <= dl[0].mid && dl[x].mid == pgno) {
if (mp != dl[x].mptr) { /* bad cursor? */
mc->mc_flags &= ~(C_INITIALIZED|C_EOF);
- mc->mc_txn->mt_flags |= MDB_TXN_ERROR;
+ txn->mt_flags |= MDB_TXN_ERROR;
return MDB_CORRUPTED;
}
/* ok, it's ours */
if (loose) {
DPRINTF(("loosen db %d page %"Z"u", DDBI(mc),
mp->mp_pgno));
- NEXT_LOOSE_PAGE(mp) = mc->mc_txn->mt_loose_pgs;
- mc->mc_txn->mt_loose_pgs = mp;
+ NEXT_LOOSE_PAGE(mp) = txn->mt_loose_pgs;
+ txn->mt_loose_pgs = mp;
+ txn->mt_loose_count++;
mp->mp_flags |= P_LOOSE;
} else {
- int rc = mdb_midl_append(&mc->mc_txn->mt_free_pgs, pgno);
+ int rc = mdb_midl_append(&txn->mt_free_pgs, pgno);
if (rc)
return rc;
}
#else
enum { Paranoid = 0, Max_retries = INT_MAX /*infinite*/ };
#endif
- int rc, retry = num * 20;
+ int rc, retry = num * 60;
MDB_txn *txn = mc->mc_txn;
MDB_env *env = txn->mt_env;
pgno_t pgno, *mop = env->me_pghead;
- unsigned i, j, k, mop_len = mop ? mop[0] : 0, n2 = num-1;
+ unsigned i, j, mop_len = mop ? mop[0] : 0, n2 = num-1;
MDB_page *np;
txnid_t oldest = 0, last;
MDB_cursor_op op;
MDB_cursor m2;
+ int found_old = 0;
/* If there are any loose pages, just use them */
if (num == 1 && txn->mt_loose_pgs) {
np = txn->mt_loose_pgs;
txn->mt_loose_pgs = NEXT_LOOSE_PAGE(np);
+ txn->mt_loose_count--;
DPRINTF(("db %d use loose page %"Z"u", DDBI(mc),
np->mp_pgno));
*mp = np;
for (op = MDB_FIRST;; op = MDB_NEXT) {
MDB_val key, data;
MDB_node *leaf;
- pgno_t *idl, old_id, new_id;
+ pgno_t *idl;
/* Seek a big enough contiguous page range. Prefer
* pages at the tail, just truncating the list.
if (op == MDB_FIRST) { /* 1st iteration */
/* Prepare to fetch more and coalesce */
- oldest = mdb_find_oldest(txn);
last = env->me_pglast;
+ oldest = env->me_pgoldest;
mdb_cursor_init(&m2, txn, FREE_DBI, NULL);
if (last) {
op = MDB_SET_RANGE;
last++;
/* Do not fetch more if the record will be too recent */
- if (oldest <= last)
- break;
+ if (oldest <= last) {
+ if (!found_old) {
+ oldest = mdb_find_oldest(txn);
+ env->me_pgoldest = oldest;
+ found_old = 1;
+ }
+ if (oldest <= last)
+ break;
+ }
rc = mdb_cursor_get(&m2, &key, NULL, op);
if (rc) {
if (rc == MDB_NOTFOUND)
goto fail;
}
last = *(txnid_t*)key.mv_data;
- if (oldest <= last)
- break;
+ if (oldest <= last) {
+ if (!found_old) {
+ oldest = mdb_find_oldest(txn);
+ env->me_pgoldest = oldest;
+ found_old = 1;
+ }
+ if (oldest <= last)
+ break;
+ }
np = m2.mc_pg[m2.mc_top];
leaf = NODEPTR(np, m2.mc_ki[m2.mc_top]);
if ((rc = mdb_node_read(txn, leaf, &data)) != MDB_SUCCESS)
#if (MDB_DEBUG) > 1
DPRINTF(("IDL read txn %"Z"u root %"Z"u num %u",
last, txn->mt_dbs[FREE_DBI].md_root, i));
- for (k = i; k; k--)
- DPRINTF(("IDL %"Z"u", idl[k]));
+ for (j = i; j; j--)
+ DPRINTF(("IDL %"Z"u", idl[j]));
#endif
/* Merge in descending sorted order */
- j = mop_len;
- k = mop_len += i;
- mop[0] = (pgno_t)-1;
- old_id = mop[j];
- while (i) {
- new_id = idl[i--];
- for (; old_id < new_id; old_id = mop[--j])
- mop[k--] = old_id;
- mop[k--] = new_id;
- }
- mop[0] = mop_len;
+ mdb_midl_xmerge(mop, idl);
+ mop_len = mop[0];
}
/* Use new pages from the map when nothing suitable in the freeDB */
mdb_env_sync(MDB_env *env, int force)
{
int rc = 0;
+ if (env->me_flags & MDB_RDONLY)
+ return EACCES;
if (force || !F_ISSET(env->me_flags, MDB_NOSYNC)) {
if (env->me_flags & MDB_WRITEMAP) {
int flags = ((env->me_flags & MDB_MAPASYNC) && !force)
rc = ErrCode();
#endif
} else {
+#ifdef BROKEN_FDATASYNC
+ if (env->me_flags & MDB_FSYNCONLY) {
+ if (fsync(env->me_fd))
+ rc = ErrCode();
+ } else
+#endif
if (MDB_FDATASYNC(env->me_fd))
rc = ErrCode();
}
uint16_t x;
int rc, new_notls = 0;
- /* Setup db info */
- txn->mt_numdbs = env->me_numdbs;
- txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
-
if (txn->mt_flags & MDB_TXN_RDONLY) {
+ txn->mt_flags = MDB_TXN_RDONLY;
+ /* Setup db info */
+ txn->mt_numdbs = env->me_numdbs;
+ txn->mt_dbxs = env->me_dbxs; /* mostly static anyway */
if (!ti) {
meta = env->me_metas[ mdb_env_pick_meta(env) ];
txn->mt_txnid = meta->mm_txnid;
return rc;
}
}
- txn->mt_txnid = r->mr_txnid = ti->mti_txnid;
+ do /* LY: Retry on a race, ITS#7970. */
+ r->mr_txnid = ti->mti_txnid;
+ while(r->mr_txnid != ti->mti_txnid);
+ txn->mt_txnid = r->mr_txnid;
txn->mt_u.reader = r;
meta = env->me_metas[txn->mt_txnid & 1];
}
meta = env->me_metas[ mdb_env_pick_meta(env) ];
txn->mt_txnid = meta->mm_txnid;
}
+ /* Setup db info */
+ txn->mt_numdbs = env->me_numdbs;
txn->mt_txnid++;
#if MDB_DEBUG
if (txn->mt_txnid == mdb_debug_start)
mdb_debug = 1;
#endif
+ txn->mt_flags = 0;
+ txn->mt_child = NULL;
+ txn->mt_loose_pgs = NULL;
+ txn->mt_loose_count = 0;
txn->mt_dirty_room = MDB_IDL_UM_MAX;
txn->mt_u.dirty_list = env->me_dirty_list;
txn->mt_u.dirty_list[0].mid = 0;
}
tsize = sizeof(MDB_ntxn);
}
- size = tsize + env->me_maxdbs * (sizeof(MDB_db)+1);
+ size = tsize;
if (!(flags & MDB_RDONLY)) {
+ if (!parent) {
+ txn = env->me_txn0; /* just reuse preallocated write txn */
+ goto ok;
+ }
+ /* child txns use own copy of cursors */
size += env->me_maxdbs * sizeof(MDB_cursor *);
- /* child txns use parent's dbiseqs */
- if (!parent)
- size += env->me_maxdbs * sizeof(unsigned int);
}
+ size += env->me_maxdbs * (sizeof(MDB_db)+1);
if ((txn = calloc(1, size)) == NULL) {
DPRINTF(("calloc: %s", strerror(errno)));
}
txn->mt_env = env;
+ok:
if (parent) {
unsigned int i;
txn->mt_u.dirty_list = malloc(sizeof(MDB_ID2)*MDB_IDL_UM_SIZE);
} else {
rc = mdb_txn_renew0(txn);
}
- if (rc)
- free(txn);
- else {
+ if (rc) {
+ if (txn != env->me_txn0)
+ free(txn);
+ } else {
*ret = txn;
DPRINTF(("begin txn %"Z"u%c %p on mdbenv %p, root page %"Z"u",
txn->mt_txnid, (txn->mt_flags & MDB_TXN_RDONLY) ? 'r' : 'w',
txn->mt_numdbs = 0; /* close nothing if called again */
txn->mt_dbxs = NULL; /* mark txn as reset */
} else {
- mdb_cursors_close(txn, 0);
+ pgno_t *pghead = env->me_pghead;
+ mdb_cursors_close(txn, 0);
if (!(env->me_flags & MDB_WRITEMAP)) {
mdb_dlist_free(txn);
}
- mdb_midl_free(env->me_pghead);
- if (txn->mt_parent) {
+ if (!txn->mt_parent) {
+ if (mdb_midl_shrink(&txn->mt_free_pgs))
+ env->me_free_pgs = txn->mt_free_pgs;
+ /* me_pgstate: */
+ env->me_pghead = NULL;
+ env->me_pglast = 0;
+
+ env->me_txn = NULL;
+ /* The writer mutex was locked in mdb_txn_begin. */
+ if (env->me_txns)
+ UNLOCK_MUTEX_W(env);
+ } else {
txn->mt_parent->mt_child = NULL;
env->me_pgstate = ((MDB_ntxn *)txn)->mnt_pgstate;
mdb_midl_free(txn->mt_free_pgs);
mdb_midl_free(txn->mt_spill_pgs);
free(txn->mt_u.dirty_list);
- return;
}
- if (mdb_midl_shrink(&txn->mt_free_pgs))
- env->me_free_pgs = txn->mt_free_pgs;
- env->me_pghead = NULL;
- env->me_pglast = 0;
-
- env->me_txn = NULL;
- /* The writer mutex was locked in mdb_txn_begin. */
- if (env->me_txns)
- UNLOCK_MUTEX_W(env);
+ mdb_midl_free(pghead);
}
}
if ((txn->mt_flags & MDB_TXN_RDONLY) && txn->mt_u.reader)
txn->mt_u.reader->mr_pid = 0;
- free(txn);
+ if (txn != txn->mt_env->me_txn0)
+ free(txn);
}
/** Save the freelist as of this transaction to the freeDB.
return rc;
}
- /* Dispose of loose pages. Usually they will have all
- * been used up by the time we get here.
- */
- if (txn->mt_loose_pgs) {
+ if (!env->me_pghead && txn->mt_loose_pgs) {
+ /* Put loose page numbers in mt_free_pgs, since
+ * we may be unable to return them to me_pghead.
+ */
MDB_page *mp = txn->mt_loose_pgs;
- /* Just return them to freeDB */
- if (env->me_pghead) {
- int i, j;
- mop = env->me_pghead;
- for (; mp; mp = NEXT_LOOSE_PAGE(mp)) {
- pgno_t pg = mp->mp_pgno;
- j = mop[0] + 1;
- for (i = mop[0]; i && mop[i] < pg; i--)
- mop[j--] = mop[i];
- mop[j] = pg;
- mop[0] += 1;
- }
- } else {
- /* Oh well, they were wasted. Put on freelist */
- for (; mp; mp = NEXT_LOOSE_PAGE(mp)) {
- mdb_midl_append(&txn->mt_free_pgs, mp->mp_pgno);
- }
- }
+ if ((rc = mdb_midl_need(&txn->mt_free_pgs, txn->mt_loose_count)) != 0)
+ return rc;
+ for (; mp; mp = NEXT_LOOSE_PAGE(mp))
+ mdb_midl_xappend(txn->mt_free_pgs, mp->mp_pgno);
txn->mt_loose_pgs = NULL;
+ txn->mt_loose_count = 0;
}
/* MDB_RESERVE cancels meminit in ovpage malloc (when no WRITEMAP) */
}
mop = env->me_pghead;
- mop_len = mop ? mop[0] : 0;
+ mop_len = (mop ? mop[0] : 0) + txn->mt_loose_count;
/* Reserve records for me_pghead[]. Split it if multi-page,
* to avoid searching freeDB for a page range. Use keys in
total_room += head_room;
}
+ /* Return loose page numbers to me_pghead, though usually none are
+ * left at this point. The pages themselves remain in dirty_list.
+ */
+ if (txn->mt_loose_pgs) {
+ MDB_page *mp = txn->mt_loose_pgs;
+ unsigned count = txn->mt_loose_count;
+ MDB_IDL loose;
+ /* Room for loose pages + temp IDL with same */
+ if ((rc = mdb_midl_need(&env->me_pghead, 2*count+1)) != 0)
+ return rc;
+ mop = env->me_pghead;
+ loose = mop + MDB_IDL_ALLOCLEN(mop) - count;
+ for (count = 0; mp; mp = NEXT_LOOSE_PAGE(mp))
+ loose[ ++count ] = mp->mp_pgno;
+ loose[0] = count;
+ mdb_midl_sort(loose);
+ mdb_midl_xmerge(mop, loose);
+ txn->mt_loose_pgs = NULL;
+ txn->mt_loose_count = 0;
+ mop_len = mop[0];
+ }
+
/* Fill in the reserved me_pghead records */
rc = MDB_SUCCESS;
if (mop_len) {
/* Write up to MDB_COMMIT_PAGES dirty pages at a time. */
if (pos!=next_pos || n==MDB_COMMIT_PAGES || wsize+size>MAX_WRITE) {
if (n) {
+retry_write:
/* Write previous page(s) */
#ifdef MDB_USE_PWRITEV
wres = pwritev(env->me_fd, iov, n, wpos);
if (n == 1) {
wres = pwrite(env->me_fd, iov[0].iov_base, wsize, wpos);
} else {
+retry_seek:
if (lseek(env->me_fd, wpos, SEEK_SET) == -1) {
rc = ErrCode();
+ if (rc == EINTR)
+ goto retry_seek;
DPRINTF(("lseek: %s", strerror(rc)));
return rc;
}
if (wres != wsize) {
if (wres < 0) {
rc = ErrCode();
+ if (rc == EINTR)
+ goto retry_write;
DPRINTF(("Write error: %s", strerror(rc)));
} else {
rc = EIO; /* TODO: Use which error code? */
#endif /* _WIN32 */
}
+ /* MIPS has cache coherency issues, this is a no-op everywhere else
+ * Note: for any size >= on-chip cache size, entire on-chip cache is
+ * flushed.
+ */
+ CACHEFLUSH(env->me_map, txn->mt_next_pgno * env->me_psize, DCACHE);
+
for (i = keep; ++i <= pagecount; ) {
dp = dl[i].mptr;
/* This is a page we skipped above */
for (lp = &parent->mt_loose_pgs; *lp; lp = &NEXT_LOOSE_PAGE(lp))
;
*lp = txn->mt_loose_pgs;
+ parent->mt_loose_count += txn->mt_loose_count;
parent->mt_child = NULL;
mdb_midl_free(((MDB_ntxn *)txn)->mnt_pgstate.mf_pghead);
(rc = mdb_env_write_meta(txn)))
goto fail;
+ /* Free P_LOOSE pages left behind in dirty_list */
+ if (!(env->me_flags & MDB_WRITEMAP))
+ mdb_dlist_free(txn);
+
done:
env->me_pglast = 0;
env->me_txn = NULL;
if (env->me_txns)
UNLOCK_MUTEX_W(env);
- free(txn);
+ if (txn != env->me_txn0)
+ free(txn);
return MDB_SUCCESS;
int len;
#define DO_PWRITE(rc, fd, ptr, size, len, pos) do { \
len = pwrite(fd, ptr, size, pos); \
- rc = (len >= 0); } while(0)
+ if (len == -1 && ErrCode() == EINTR) continue; \
+ rc = (len >= 0); break; } while(1)
#endif
DPUTS("writing new meta page");
/* Write to the SYNC fd */
mfd = env->me_flags & (MDB_NOSYNC|MDB_NOMETASYNC) ?
env->me_fd : env->me_mfd;
+retry_write:
#ifdef _WIN32
{
memset(&ov, 0, sizeof(ov));
#endif
if (rc != len) {
rc = rc < 0 ? ErrCode() : EIO;
+ if (rc == EINTR)
+ goto retry_write;
DPUTS("write failed, disk error?");
/* On a failure, the pagecache still contains the new data.
* Write some old data back, to prevent it from being used.
env->me_flags |= MDB_FATAL_ERROR;
return rc;
}
+ /* MIPS has cache coherency issues, this is a no-op everywhere else */
+ CACHEFLUSH(env->me_map + off, len, DCACHE);
done:
/* Memory ordering issues are irrelevant; since the entire writer
* is wrapped by wmutex, all of these changes will become visible
if (env->me_txns)
env->me_txns->mti_txnid = txn->mt_txnid;
- /* MIPS has cache coherency issues, this is a no-op everywhere else */
- if (!(env->me_flags & MDB_WRITEMAP)) {
- CACHEFLUSH(env->me_map, txn->mt_next_pgno * env->me_psize, DCACHE);
- }
-
return MDB_SUCCESS;
}
return MDB_SUCCESS;
}
+static int ESECT
+mdb_fsize(HANDLE fd, size_t *size)
+{
+#ifdef _WIN32
+ LARGE_INTEGER fsize;
+
+ if (!GetFileSizeEx(fd, &fsize))
+ return ErrCode();
+
+ *size = fsize.QuadPart;
+#else
+ struct stat st;
+
+ if (fstat(fd, &st))
+ return ErrCode();
+
+ *size = st.st_size;
+#endif
+ return MDB_SUCCESS;
+}
+
+#ifdef BROKEN_FDATASYNC
+#include <sys/utsname.h>
+#include <sys/vfs.h>
+#endif
+
/** Further setup required for opening an LMDB environment
*/
static int ESECT
else
env->me_pidquery = PROCESS_QUERY_INFORMATION;
#endif /* _WIN32 */
+#ifdef BROKEN_FDATASYNC
+ /* ext3/ext4 fdatasync is broken on some older Linux kernels.
+ * https://lkml.org/lkml/2012/9/3/83
+ * Kernels after 3.6-rc6 are known good.
+ * https://lkml.org/lkml/2012/9/10/556
+ * See if the DB is on ext3/ext4, then check for new enough kernel
+ * Kernels 2.6.32.60, 2.6.34.15, 3.2.30, and 3.5.4 are also known
+ * to be patched.
+ */
+ {
+ struct statfs st;
+ fstatfs(env->me_fd, &st);
+ while (st.f_type == 0xEF53) {
+ struct utsname uts;
+ int i;
+ uname(&uts);
+ if (uts.release[0] < '3') {
+ if (!strncmp(uts.release, "2.6.32.", 7)) {
+ i = atoi(uts.release+7);
+ if (i >= 60)
+ break; /* 2.6.32.60 and newer is OK */
+ } else if (!strncmp(uts.release, "2.6.34.", 7)) {
+ i = atoi(uts.release+7);
+ if (i >= 15)
+ break; /* 2.6.34.15 and newer is OK */
+ }
+ } else if (uts.release[0] == '3') {
+ i = atoi(uts.release+2);
+ if (i > 5)
+ break; /* 3.6 and newer is OK */
+ if (i == 5) {
+ i = atoi(uts.release+4);
+ if (i >= 4)
+ break; /* 3.5.4 and newer is OK */
+ } else if (i == 2) {
+ i = atoi(uts.release+4);
+ if (i >= 30)
+ break; /* 3.2.30 and newer is OK */
+ }
+ } else { /* 4.x and newer is OK */
+ break;
+ }
+ env->me_flags |= MDB_FSYNCONLY;
+ break;
+ }
+ }
+#endif
memset(&meta, 0, sizeof(meta));
extern const PIMAGE_TLS_CALLBACK mdb_tls_cbp;
const PIMAGE_TLS_CALLBACK mdb_tls_cbp = mdb_tls_callback;
#pragma const_seg()
-#else /* WIN32 */
+#else /* _WIN32 */
#pragma comment(linker, "/INCLUDE:__tls_used")
#pragma comment(linker, "/INCLUDE:_mdb_tls_cbp")
#pragma data_seg(".CRT$XLB")
return rc;
}
-/** Try to get exlusive lock, otherwise shared.
+/** Try to get exclusive lock, otherwise shared.
* Maintain *excl = -1: no/unknown lock, 0: shared, 1: exclusive.
*/
static int ESECT
* @param[in] env The LMDB environment.
* @param[in] lpath The pathname of the file used for the lock region.
* @param[in] mode The Unix permissions for the file, if we create it.
- * @param[out] excl Resulting file lock type: -1 none, 0 shared, 1 exclusive
* @param[in,out] excl In -1, out lock type: -1 none, 0 shared, 1 exclusive
* @return 0 on success, non-zero on failure.
*/
if (!((flags & MDB_RDONLY) ||
(env->me_pbuf = calloc(1, env->me_psize))))
rc = ENOMEM;
+ if (!(flags & MDB_RDONLY)) {
+ MDB_txn *txn;
+ int tsize = sizeof(MDB_txn), size = tsize + env->me_maxdbs *
+ (sizeof(MDB_db)+sizeof(MDB_cursor *)+sizeof(unsigned int)+1);
+ txn = calloc(1, size);
+ if (txn) {
+ txn->mt_dbs = (MDB_db *)((char *)txn + tsize);
+ txn->mt_cursors = (MDB_cursor **)(txn->mt_dbs + env->me_maxdbs);
+ txn->mt_dbiseqs = (unsigned int *)(txn->mt_cursors + env->me_maxdbs);
+ txn->mt_dbflags = (unsigned char *)(txn->mt_dbiseqs + env->me_maxdbs);
+ txn->mt_env = env;
+ txn->mt_dbxs = env->me_dbxs;
+ env->me_txn0 = txn;
+ } else {
+ rc = ENOMEM;
+ }
+ }
}
leave:
return;
/* Doing this here since me_dbxs may not exist during mdb_env_close */
- for (i = env->me_maxdbs; --i > MAIN_DBI; )
- free(env->me_dbxs[i].md_name.mv_data);
+ if (env->me_dbxs) {
+ for (i = env->me_maxdbs; --i > MAIN_DBI; )
+ free(env->me_dbxs[i].md_name.mv_data);
+ free(env->me_dbxs);
+ }
free(env->me_pbuf);
free(env->me_dbiseqs);
free(env->me_dbflags);
- free(env->me_dbxs);
free(env->me_path);
free(env->me_dirty_list);
+ free(env->me_txn0);
mdb_midl_free(env->me_free_pgs);
if (env->me_flags & MDB_ENV_TXKEY) {
if (op == MDB_PREV || op == MDB_PREV_DUP) {
rc = mdb_cursor_prev(&mc->mc_xcursor->mx_cursor, data, NULL, MDB_PREV);
if (op != MDB_PREV || rc != MDB_NOTFOUND) {
- if (rc == MDB_SUCCESS)
+ if (rc == MDB_SUCCESS) {
MDB_GET_KEY(leaf, key);
+ mc->mc_flags &= ~C_EOF;
+ }
return rc;
}
- } else {
- mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
- if (op == MDB_PREV_DUP)
- return MDB_NOTFOUND;
}
+ } else {
+ mc->mc_xcursor->mx_cursor.mc_flags &= ~(C_INITIALIZED|C_EOF);
+ if (op == MDB_PREV_DUP)
+ return MDB_NOTFOUND;
}
}
rc = MDB_INCOMPATIBLE;
break;
}
+ {
+ MDB_node *leaf = NODEPTR(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top]);
+ if (!F_ISSET(leaf->mn_flags, F_DUPDATA)) {
+ MDB_GET_KEY(leaf, key);
+ rc = mdb_node_read(mc->mc_txn, leaf, data);
+ break;
+ }
+ }
if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED)) {
rc = EINVAL;
break;
return MDB_BAD_VALSIZE;
ptr = LEAF2KEY(mc->mc_pg[mc->mc_top], mc->mc_ki[mc->mc_top], ksize);
memcpy(ptr, key->mv_data, ksize);
+fix_parent:
+ /* if overwriting slot 0 of leaf, need to
+ * update branch key if there is a parent page
+ */
+ if (mc->mc_top && !mc->mc_ki[mc->mc_top]) {
+ unsigned short top = mc->mc_top;
+ mc->mc_top--;
+ /* slot 0 is always an empty key, find real slot */
+ while (mc->mc_top && !mc->mc_ki[mc->mc_top])
+ mc->mc_top--;
+ if (mc->mc_ki[mc->mc_top])
+ rc2 = mdb_update_key(mc, key);
+ else
+ rc2 = MDB_SUCCESS;
+ mc->mc_top = top;
+ if (rc2)
+ return rc2;
+ }
return MDB_SUCCESS;
}
data->mv_data = olddata.mv_data;
else if (!(mc->mc_flags & C_SUB))
memcpy(olddata.mv_data, data->mv_data, data->mv_size);
- else
+ else {
memcpy(NODEKEY(leaf), key->mv_data, key->mv_size);
+ goto fix_parent;
+ }
return MDB_SUCCESS;
}
mdb_node_del(mc, 0);
mc->mc_snum = 0;
mc->mc_top = 0;
mc->mc_pg[0] = 0;
+ mc->mc_ki[0] = 0;
mc->mc_flags = 0;
if (txn->mt_dbs[dbi].md_flags & MDB_DUPSORT) {
mdb_tassert(txn, mx != NULL);
cdst->mc_ki[cdst->mc_top] = 0;
rc = mdb_update_key(cdst, &nullkey);
cdst->mc_ki[cdst->mc_top] = ix;
- mdb_cassert(csrc, rc == MDB_SUCCESS);
+ mdb_cassert(cdst, rc == MDB_SUCCESS);
}
}
m3 = m2;
if (m3 == mc || m3->mc_snum < mc->mc_snum) continue;
if (m3->mc_pg[0] == mp) {
- m3->mc_snum--;
- m3->mc_top--;
for (i=0; i<m3->mc_snum; i++) {
m3->mc_pg[i] = m3->mc_pg[i+1];
m3->mc_ki[i] = m3->mc_ki[i+1];
}
+ m3->mc_snum--;
+ m3->mc_top--;
}
}
}
if (mc->mc_ki[ptop] == 0) {
rc = mdb_page_merge(&mn, mc);
} else {
+ MDB_cursor dummy;
oldki += NUMKEYS(mn.mc_pg[mn.mc_top]);
mn.mc_ki[mn.mc_top] += mc->mc_ki[mn.mc_top] + 1;
+ /* We want mdb_rebalance to find mn when doing fixups */
+ if (mc->mc_flags & C_SUB) {
+ dummy.mc_next = mc->mc_txn->mt_cursors[mc->mc_dbi];
+ mc->mc_txn->mt_cursors[mc->mc_dbi] = &dummy;
+ dummy.mc_xcursor = (MDB_xcursor *)&mn;
+ } else {
+ mn.mc_next = mc->mc_txn->mt_cursors[mc->mc_dbi];
+ mc->mc_txn->mt_cursors[mc->mc_dbi] = &mn;
+ }
rc = mdb_page_merge(mc, &mn);
+ if (mc->mc_flags & C_SUB)
+ mc->mc_txn->mt_cursors[mc->mc_dbi] = dummy.mc_next;
+ else
+ mc->mc_txn->mt_cursors[mc->mc_dbi] = mn.mc_next;
mdb_cursor_copy(&mn, mc);
}
mc->mc_flags &= ~C_EOF;
MDB_cursor *m2, *m3;
MDB_dbi dbi = mc->mc_dbi;
+ /* DB is totally empty now, just bail out.
+ * Other cursors adjustments were already done
+ * by mdb_rebalance and aren't needed here.
+ */
+ if (!mc->mc_snum)
+ return rc;
+
mp = mc->mc_pg[mc->mc_top];
nkeys = NUMKEYS(mp);
#else
pthread_mutex_init(&my.mc_mutex, NULL);
pthread_cond_init(&my.mc_cond, NULL);
+#ifdef HAVE_MEMALIGN
+ my.mc_wbuf[0] = memalign(env->me_os_psize, MDB_WBUF*2);
+ if (my.mc_wbuf[0] == NULL)
+ return errno;
+#else
rc = posix_memalign((void **)&my.mc_wbuf[0], env->me_os_psize, MDB_WBUF*2);
if (rc)
return rc;
+#endif
#endif
memset(my.mc_wbuf[0], 0, MDB_WBUF*2);
my.mc_wbuf[1] = my.mc_wbuf[0] + MDB_WBUF;
/* Set metapage 1 */
mm->mm_last_pg = txn->mt_next_pgno - freecount - 1;
mm->mm_dbs[1] = txn->mt_dbs[1];
- mm->mm_dbs[1].md_root = mm->mm_last_pg;
- mm->mm_txnid = 1;
+ if (mm->mm_last_pg > 1) {
+ mm->mm_dbs[1].md_root = mm->mm_last_pg;
+ mm->mm_txnid = 1;
+ } else {
+ mm->mm_dbs[1].md_root = P_INVALID;
+ }
}
my.mc_wlen[0] = env->me_psize * 2;
my.mc_txn = txn;
goto leave;
w2 = txn->mt_next_pgno * env->me_psize;
-#ifdef WIN32
- {
- LARGE_INTEGER fsize;
- GetFileSizeEx(env->me_fd, &fsize);
- if (w2 > fsize.QuadPart)
- w2 = fsize.QuadPart;
- }
-#else
{
- struct stat st;
- fstat(env->me_fd, &st);
- if (w2 > (size_t)st.st_size)
- w2 = st.st_size;
+ size_t fsize = 0;
+ if ((rc = mdb_fsize(env->me_fd, &fsize)))
+ goto leave;
+ if (w2 > fsize)
+ w2 = fsize;
}
-#endif
wsize = w2 - wsize;
while (wsize > 0) {
if (wsize > MAX_WRITE)
MDB_val key, data;
MDB_dbi i;
MDB_cursor mc;
+ MDB_db dummy;
int rc, dbflag, exact;
unsigned int unused = 0, seq;
size_t len;
return MDB_INCOMPATIBLE;
} else if (rc == MDB_NOTFOUND && (flags & MDB_CREATE)) {
/* Create if requested */
- MDB_db dummy;
data.mv_size = sizeof(MDB_db);
data.mv_data = &dummy;
memset(&dummy, 0, sizeof(dummy));
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