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Overview
| Comment: | In os_unix.c, do not return SQLITE_BUSY to SQLite following an error in fcntl(F_UNLCK), regardless of the value of errno. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
ff6dfe6ed74f9ff1669b2bda41d61a01 |
| User & Date: | dan 2011-04-01 11:56:33 |
Context
|
2011-04-01
| ||
| 13:29 | Move a variable declaration inside an #ifdef to avoid a compiler warning. check-in: 7a6d05df user: drh tags: trunk | |
| 11:56 | In os_unix.c, do not return SQLITE_BUSY to SQLite following an error in fcntl(F_UNLCK), regardless of the value of errno. check-in: ff6dfe6e user: dan tags: trunk | |
| 09:04 | Fix some problems in os_unix.c when compiled with ENABLE_LOCKING_STYLE on OSX. Also some minor issues with test scripts. check-in: 8088031b user: dan tags: trunk | |
Changes
Changes to src/os_unix.c.
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(sqliteIOErr == SQLITE_IOERR_CHECKRESERVEDLOCK) ){
return SQLITE_BUSY;
}
/* else fall through */
case EPERM:
return SQLITE_PERM;
case EDEADLK:
return SQLITE_IOERR_BLOCKED;
#if EOPNOTSUPP!=ENOTSUP
case EOPNOTSUPP:
/* something went terribly awry, unless during file system support
* introspection, in which it actually means what it says */
#endif
#ifdef ENOTSUP
................................................................................
#ifndef __DJGPP__
if( !reserved && !pFile->pInode->bProcessLock ){
struct flock lock;
lock.l_whence = SEEK_SET;
lock.l_start = RESERVED_BYTE;
lock.l_len = 1;
lock.l_type = F_WRLCK;
if (-1 == osFcntl(pFile->h, F_GETLK, &lock)) {
int tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_CHECKRESERVEDLOCK);
pFile->lastErrno = tErrno;
} else if( lock.l_type!=F_UNLCK ){
reserved = 1;
}
}
#endif
unixLeaveMutex();
................................................................................
/* Drop the temporary PENDING lock */
lock.l_start = PENDING_BYTE;
lock.l_len = 1L;
lock.l_type = F_UNLCK;
if( unixFileLock(pFile, &lock) && rc==SQLITE_OK ){
/* This could happen with a network mount */
tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
}
if( rc ){
if( rc!=SQLITE_BUSY ){
pFile->lastErrno = tErrno;
}
goto end_lock;
................................................................................
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = SHARED_FIRST;
lock.l_len = divSize;
if( unixFileLock(pFile, &lock)==(-1) ){
tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
if( IS_LOCK_ERROR(rc) ){
pFile->lastErrno = tErrno;
}
goto end_unlock;
}
lock.l_type = F_RDLCK;
lock.l_whence = SEEK_SET;
................................................................................
}
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = SHARED_FIRST+divSize;
lock.l_len = SHARED_SIZE-divSize;
if( unixFileLock(pFile, &lock)==(-1) ){
tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
if( IS_LOCK_ERROR(rc) ){
pFile->lastErrno = tErrno;
}
goto end_unlock;
}
}else
#endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
{
lock.l_type = F_RDLCK;
lock.l_whence = SEEK_SET;
lock.l_start = SHARED_FIRST;
lock.l_len = SHARED_SIZE;
if( unixFileLock(pFile, &lock) ){
tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_RDLOCK);
if( rc!=SQLITE_BUSY ){
pFile->lastErrno = tErrno;
}
goto end_unlock;
}
}
}
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = PENDING_BYTE;
lock.l_len = 2L; assert( PENDING_BYTE+1==RESERVED_BYTE );
if( unixFileLock(pFile, &lock)==0 ){
pInode->eFileLock = SHARED_LOCK;
}else{
tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
if( rc!=SQLITE_BUSY ){
pFile->lastErrno = tErrno;
}
goto end_unlock;
}
}
if( eFileLock==NO_LOCK ){
/* Decrement the shared lock counter. Release the lock using an
** OS call only when all threads in this same process have released
** the lock.
................................................................................
lock.l_start = lock.l_len = 0L;
SimulateIOErrorBenign(1);
SimulateIOError( h=(-1) )
SimulateIOErrorBenign(0);
if( unixFileLock(pFile, &lock)==0 ){
pInode->eFileLock = NO_LOCK;
}else{
tErrno = errno;
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
if( rc!=SQLITE_BUSY ){
pFile->lastErrno = tErrno;
}
pInode->eFileLock = NO_LOCK;
pFile->eFileLock = NO_LOCK;
}
}
/* Decrement the count of locks against this same file. When the
** count reaches zero, close any other file descriptors whose close
................................................................................
/* To fully unlock the database, delete the lock file */
assert( eFileLock==NO_LOCK );
if( unlink(zLockFile) ){
int rc = 0;
int tErrno = errno;
if( ENOENT != tErrno ){
rc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
}
if( IS_LOCK_ERROR(rc) ){
pFile->lastErrno = tErrno;
}
return rc;
}
pFile->eFileLock = NO_LOCK;
................................................................................
int lrc = robust_flock(pFile->h, LOCK_EX | LOCK_NB);
if( !lrc ){
/* got the lock, unlock it */
lrc = robust_flock(pFile->h, LOCK_UN);
if ( lrc ) {
int tErrno = errno;
/* unlock failed with an error */
lrc = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
if( IS_LOCK_ERROR(lrc) ){
pFile->lastErrno = tErrno;
rc = lrc;
}
}
} else {
int tErrno = errno;
................................................................................
/* shared can just be set because we always have an exclusive */
if (eFileLock==SHARED_LOCK) {
pFile->eFileLock = eFileLock;
return SQLITE_OK;
}
/* no, really, unlock. */
int rc = robust_flock(pFile->h, LOCK_UN);
if (rc) {
int r, tErrno = errno;
r = sqliteErrorFromPosixError(tErrno, SQLITE_IOERR_UNLOCK);
if( IS_LOCK_ERROR(r) ){
pFile->lastErrno = tErrno;
}
#ifdef SQLITE_IGNORE_FLOCK_LOCK_ERRORS
if( (r & SQLITE_IOERR) == SQLITE_IOERR ){
r = SQLITE_BUSY;
}
#endif /* SQLITE_IGNORE_FLOCK_LOCK_ERRORS */
return r;
} else {
pFile->eFileLock = NO_LOCK;
return SQLITE_OK;
}
}
/*
** Close a file.
|
> > > > > > > | < | | | | | | > > > > > | < | < < | < | < < | < | < | | | < < < < < < < | < < | | |
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(sqliteIOErr == SQLITE_IOERR_CHECKRESERVEDLOCK) ){
return SQLITE_BUSY;
}
/* else fall through */
case EPERM:
return SQLITE_PERM;
/* EDEADLK is only possible if a call to fcntl(F_SETLKW) is made. And
** this module never makes such a call. And the code in SQLite itself
** asserts that SQLITE_IOERR_BLOCKED is never returned. For these reasons
** this case is also commented out. If the system does set errno to EDEADLK,
** the default SQLITE_IOERR_XXX code will be returned. */
#if 0
case EDEADLK:
return SQLITE_IOERR_BLOCKED;
#endif
#if EOPNOTSUPP!=ENOTSUP
case EOPNOTSUPP:
/* something went terribly awry, unless during file system support
* introspection, in which it actually means what it says */
#endif
#ifdef ENOTSUP
................................................................................
#ifndef __DJGPP__
if( !reserved && !pFile->pInode->bProcessLock ){
struct flock lock;
lock.l_whence = SEEK_SET;
lock.l_start = RESERVED_BYTE;
lock.l_len = 1;
lock.l_type = F_WRLCK;
if( osFcntl(pFile->h, F_GETLK, &lock) ){
rc = SQLITE_IOERR_CHECKRESERVEDLOCK;
pFile->lastErrno = errno;
} else if( lock.l_type!=F_UNLCK ){
reserved = 1;
}
}
#endif
unixLeaveMutex();
................................................................................
/* Drop the temporary PENDING lock */
lock.l_start = PENDING_BYTE;
lock.l_len = 1L;
lock.l_type = F_UNLCK;
if( unixFileLock(pFile, &lock) && rc==SQLITE_OK ){
/* This could happen with a network mount */
tErrno = errno;
rc = SQLITE_IOERR_UNLOCK;
}
if( rc ){
if( rc!=SQLITE_BUSY ){
pFile->lastErrno = tErrno;
}
goto end_lock;
................................................................................
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = SHARED_FIRST;
lock.l_len = divSize;
if( unixFileLock(pFile, &lock)==(-1) ){
tErrno = errno;
rc = SQLITE_IOERR_UNLOCK;
if( IS_LOCK_ERROR(rc) ){
pFile->lastErrno = tErrno;
}
goto end_unlock;
}
lock.l_type = F_RDLCK;
lock.l_whence = SEEK_SET;
................................................................................
}
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = SHARED_FIRST+divSize;
lock.l_len = SHARED_SIZE-divSize;
if( unixFileLock(pFile, &lock)==(-1) ){
tErrno = errno;
rc = SQLITE_IOERR_UNLOCK;
if( IS_LOCK_ERROR(rc) ){
pFile->lastErrno = tErrno;
}
goto end_unlock;
}
}else
#endif /* defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE */
{
lock.l_type = F_RDLCK;
lock.l_whence = SEEK_SET;
lock.l_start = SHARED_FIRST;
lock.l_len = SHARED_SIZE;
if( unixFileLock(pFile, &lock) ){
/* In theory, the call to unixFileLock() cannot fail because another
** process is holding an incompatible lock. If it does, this
** indicates that the other process is not following the locking
** protocol. If this happens, return SQLITE_IOERR_RDLOCK. Returning
** SQLITE_BUSY would confuse the upper layer (in practice it causes
** an assert to fail). */
rc = SQLITE_IOERR_RDLOCK;
pFile->lastErrno = errno;
goto end_unlock;
}
}
}
lock.l_type = F_UNLCK;
lock.l_whence = SEEK_SET;
lock.l_start = PENDING_BYTE;
lock.l_len = 2L; assert( PENDING_BYTE+1==RESERVED_BYTE );
if( unixFileLock(pFile, &lock)==0 ){
pInode->eFileLock = SHARED_LOCK;
}else{
rc = SQLITE_IOERR_UNLOCK;
pFile->lastErrno = errno;
goto end_unlock;
}
}
if( eFileLock==NO_LOCK ){
/* Decrement the shared lock counter. Release the lock using an
** OS call only when all threads in this same process have released
** the lock.
................................................................................
lock.l_start = lock.l_len = 0L;
SimulateIOErrorBenign(1);
SimulateIOError( h=(-1) )
SimulateIOErrorBenign(0);
if( unixFileLock(pFile, &lock)==0 ){
pInode->eFileLock = NO_LOCK;
}else{
rc = SQLITE_IOERR_UNLOCK;
pFile->lastErrno = errno;
pInode->eFileLock = NO_LOCK;
pFile->eFileLock = NO_LOCK;
}
}
/* Decrement the count of locks against this same file. When the
** count reaches zero, close any other file descriptors whose close
................................................................................
/* To fully unlock the database, delete the lock file */
assert( eFileLock==NO_LOCK );
if( unlink(zLockFile) ){
int rc = 0;
int tErrno = errno;
if( ENOENT != tErrno ){
rc = SQLITE_IOERR_UNLOCK;
}
if( IS_LOCK_ERROR(rc) ){
pFile->lastErrno = tErrno;
}
return rc;
}
pFile->eFileLock = NO_LOCK;
................................................................................
int lrc = robust_flock(pFile->h, LOCK_EX | LOCK_NB);
if( !lrc ){
/* got the lock, unlock it */
lrc = robust_flock(pFile->h, LOCK_UN);
if ( lrc ) {
int tErrno = errno;
/* unlock failed with an error */
lrc = SQLITE_IOERR_UNLOCK;
if( IS_LOCK_ERROR(lrc) ){
pFile->lastErrno = tErrno;
rc = lrc;
}
}
} else {
int tErrno = errno;
................................................................................
/* shared can just be set because we always have an exclusive */
if (eFileLock==SHARED_LOCK) {
pFile->eFileLock = eFileLock;
return SQLITE_OK;
}
/* no, really, unlock. */
if( robust_flock(pFile->h, LOCK_UN) ){
#ifdef SQLITE_IGNORE_FLOCK_LOCK_ERRORS
return SQLITE_OK;
#endif /* SQLITE_IGNORE_FLOCK_LOCK_ERRORS */
return SQLITE_IOERR_UNLOCK;
}else{
pFile->eFileLock = NO_LOCK;
return SQLITE_OK;
}
}
/*
** Close a file.
|
Changes to test/sysfault.test.
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 |
}
#-------------------------------------------------------------------------
# Various errors in locking functions.
#
foreach vfs {unix unix-excl} {
foreach {tn errno errlist} {
1 EAGAIN {{database is locked}}
2 ETIMEDOUT {{database is locked}}
3 EBUSY {{database is locked}}
4 EINTR {{database is locked}}
5 ENOLCK {{database is locked}}
6 EACCES {{database is locked}}
7 EPERM {{access permission denied}}
8 EDEADLK {{disk I/O error}}
9 ENOMEM {{disk I/O error}}
} {
proc vfsfault_install {} { test_syscall install fcntl }
set errs [list]
foreach e $errlist { lappend errs [list 1 $e] }
|
| | | | | | | |
90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 |
}
#-------------------------------------------------------------------------
# Various errors in locking functions.
#
foreach vfs {unix unix-excl} {
foreach {tn errno errlist} {
1 EAGAIN {{database is locked} {disk I/O error}}
2 ETIMEDOUT {{database is locked} {disk I/O error}}
3 EBUSY {{database is locked} {disk I/O error}}
4 EINTR {{database is locked} {disk I/O error}}
5 ENOLCK {{database is locked} {disk I/O error}}
6 EACCES {{database is locked} {disk I/O error}}
7 EPERM {{access permission denied} {disk I/O error}}
8 EDEADLK {{disk I/O error}}
9 ENOMEM {{disk I/O error}}
} {
proc vfsfault_install {} { test_syscall install fcntl }
set errs [list]
foreach e $errlist { lappend errs [list 1 $e] }
|