7d1a47cf13
This patch redoes the filesystem code from the FAT driver up to the
clipboard code in onplay.c.
Not every aspect of this is finished therefore it is still "WIP". I
don't wish to do too much at once (haha!). What is left to do is get
dircache back in the sim and find an implementation for the dircache
indicies in the tagcache and playlist code or do something else that
has the same benefit. Leaving these out for now does not make anything
unusable. All the basics are done.
Phone app code should probably get vetted (and app path handling
just plain rewritten as environment expansions); the SDL app and
Android run well.
Main things addressed:
1) Thread safety: There is none right now in the trunk code. Most of
what currently works is luck when multiple threads are involved or
multiple descriptors to the same file are open.
2) POSIX compliance: Many of the functions behave nothing like their
counterparts on a host system. This leads to inconsistent code or very
different behavior from native to hosted. One huge offender was
rename(). Going point by point would fill a book.
3) Actual running RAM usage: Many targets will use less RAM and less
stack space (some more RAM because I upped the number of cache buffers
for large memory). There's very little memory lying fallow in rarely-used
areas (see 'Key core changes' below). Also, all targets may open the same
number of directory streams whereas before those with less than 8MB RAM
were limited to 8, not 12 implying those targets will save slightly
less.
4) Performance: The test_disk plugin shows markedly improved performance,
particularly in the area of (uncached) directory scanning, due partly to
more optimal directory reading and to a better sector cache algorithm.
Uncached times tend to be better while there is a bit of a slowdown in
dircache due to it being a bit heavier of an implementation. It's not
noticeable by a human as far as I can say.
Key core changes:
1) Files and directories share core code and data structures.
2) The filesystem code knows which descriptors refer to same file.
This ensures that changes from one stream are appropriately reflected
in every open descriptor for that file (fileobj_mgr.c).
3) File and directory cache buffers are borrowed from the main sector
cache. This means that when they are not in use by a file, they are not
wasted, but used for the cache. Most of the time, only a few of them
are needed. It also means that adding more file and directory handles
is less expensive. All one must do in ensure a large enough cache to
borrow from.
4) Relative path components are supported and the namespace is unified.
It does not support full relative paths to an implied current directory;
what is does support is use of "." and "..". Adding the former would
not be very difficult. The namespace is unified in the sense that
volumes may be specified several times along with relative parts, e.g.:
"/<0>/foo/../../<1>/bar" :<=> "/<1>/bar".
5) Stack usage is down due to sharing of data, static allocation and
less duplication of strings on the stack. This requires more
serialization than I would like but since the number of threads is
limited to a low number, the tradoff in favor of the stack seems
reasonable.
6) Separates and heirarchicalizes (sic) the SIM and APP filesystem
code. SIM path and volume handling is just like the target. Some
aspects of the APP file code get more straightforward (e.g. no path
hashing is needed).
Dircache:
Deserves its own section. Dircache is new but pays homage to the old.
The old one was not compatible and so it, since it got redone, does
all the stuff it always should have done such as:
1) It may be update and used at any time during the build process.
No longer has one to wait for it to finish building to do basic file
management (create, remove, rename, etc.).
2) It does not need to be either fully scanned or completely disabled;
it can be incomplete (i.e. overfilled, missing paths), still be
of benefit and be correct.
3) Handles mounting and dismounting of individual volumes which means
a full rebuild is not needed just because you pop a new SD card in the
slot. Now, because it reuses its freed entry data, may rebuild only
that volume.
4) Much more fundamental to the file code. When it is built, it is
the keeper of the master file list whether enabled or not ("disabled"
is just a state of the cache). Its must always to ready to be started
and bind all streams opened prior to being enabled.
5) Maintains any short filenames in OEM format which means that it does
not need to be rebuilt when changing the default codepage.
Miscellaneous Compatibility:
1) Update any other code that would otherwise not work such as the
hotswap mounting code in various card drivers.
2) File management: Clipboard needed updating because of the behavioral
changes. Still needs a little more work on some finer points.
3) Remove now-obsolete functionality such as the mutex's "no preempt"
flag (which was only for the prior FAT driver).
4) struct dirinfo uses time_t rather than raw FAT directory entry
time fields. I plan to follow up on genericizing everything there
(i.e. no FAT attributes).
5) unicode.c needed some redoing so that the file code does not try
try to load codepages during a scan, which is actually a problem with
the current code. The default codepage, if any is required, is now
kept in RAM separarately (bufalloced) from codepages specified to
iso_decode() (which must not be bufalloced because the conversion
may be done by playback threads).
Brings with it some additional reusable core code:
1) Revised file functions: Reusable code that does things such as
safe path concatenation and parsing without buffer limitations or
data duplication. Variants that copy or alter the input path may be
based off these.
To do:
1) Put dircache functionality back in the sim. Treating it internally
as a different kind of file system seems the best approach at this
time.
2) Restore use of dircache indexes in the playlist and database or
something effectively the same. Since the cache doesn't have to be
complete in order to be used, not getting a hit on the cache doesn't
unambiguously say if the path exists or not.
Change-Id: Ia30f3082a136253e3a0eae0784e3091d138915c8
Reviewed-on: http://gerrit.rockbox.org/566
Reviewed-by: Michael Sevakis <jethead71@rockbox.org>
Tested: Michael Sevakis <jethead71@rockbox.org>
148 lines
6.9 KiB
C
148 lines
6.9 KiB
C
/* errno is not a global variable, because that would make using it
|
|
non-reentrant. Instead, its address is returned by the function
|
|
__errno. */
|
|
|
|
#if (defined(SIMULATOR)||defined(__PCTOOL__)) && !defined(__MINGW32__) && !defined(__CYGWIN__)
|
|
|
|
#include "/usr/include/errno.h" /* use the host system implementation */
|
|
|
|
#else /* use our own implementation */
|
|
|
|
#ifndef _SYS_ERRNO_H_
|
|
|
|
extern int * __errno(void);
|
|
|
|
#ifdef PLUGIN
|
|
#define errno (*rb->__errno())
|
|
#else
|
|
#define errno (*__errno())
|
|
#endif
|
|
|
|
#define EPERM 1 /* Not super-user */
|
|
#define ENOENT 2 /* No such file or directory */
|
|
#define ESRCH 3 /* No such process */
|
|
#define EINTR 4 /* Interrupted system call */
|
|
#define EIO 5 /* I/O error */
|
|
#define ENXIO 6 /* No such device or address */
|
|
#define E2BIG 7 /* Arg list too long */
|
|
#define ENOEXEC 8 /* Exec format error */
|
|
#define EBADF 9 /* Bad file number */
|
|
#define ECHILD 10 /* No children */
|
|
#define EAGAIN 11 /* No more processes */
|
|
#define ENOMEM 12 /* Not enough core */
|
|
#define EACCES 13 /* Permission denied */
|
|
#define EFAULT 14 /* Bad address */
|
|
#define ENOTBLK 15 /* Block device required */
|
|
#define EBUSY 16 /* Mount device busy */
|
|
#define EEXIST 17 /* File exists */
|
|
#define EXDEV 18 /* Cross-device link */
|
|
#define ENODEV 19 /* No such device */
|
|
#define ENOTDIR 20 /* Not a directory */
|
|
#define EISDIR 21 /* Is a directory */
|
|
#define EINVAL 22 /* Invalid argument */
|
|
#define ENFILE 23 /* Too many open files in system */
|
|
#define EMFILE 24 /* Too many open files */
|
|
#define ENOTTY 25 /* Not a typewriter */
|
|
#define ETXTBSY 26 /* Text file busy */
|
|
#define EFBIG 27 /* File too large */
|
|
#define ENOSPC 28 /* No space left on device */
|
|
#define ESPIPE 29 /* Illegal seek */
|
|
#define EROFS 30 /* Read only file system */
|
|
#define EMLINK 31 /* Too many links */
|
|
#define EPIPE 32 /* Broken pipe */
|
|
#define EDOM 33 /* Math arg out of domain of func */
|
|
#define ERANGE 34 /* Math result not representable */
|
|
#define ENOMSG 35 /* No message of desired type */
|
|
#define EIDRM 36 /* Identifier removed */
|
|
#define ECHRNG 37 /* Channel number out of range */
|
|
#define EL2NSYNC 38 /* Level 2 not synchronized */
|
|
#define EL3HLT 39 /* Level 3 halted */
|
|
#define EL3RST 40 /* Level 3 reset */
|
|
#define ELNRNG 41 /* Link number out of range */
|
|
#define EUNATCH 42 /* Protocol driver not attached */
|
|
#define ENOCSI 43 /* No CSI structure available */
|
|
#define EL2HLT 44 /* Level 2 halted */
|
|
#define EDEADLK 45 /* Deadlock condition */
|
|
#define ENOLCK 46 /* No record locks available */
|
|
#define EBADE 50 /* Invalid exchange */
|
|
#define EBADR 51 /* Invalid request descriptor */
|
|
#define EXFULL 52 /* Exchange full */
|
|
#define ENOANO 53 /* No anode */
|
|
#define EBADRQC 54 /* Invalid request code */
|
|
#define EBADSLT 55 /* Invalid slot */
|
|
#define EDEADLOCK 56 /* File locking deadlock error */
|
|
#define EBFONT 57 /* Bad font file fmt */
|
|
#define ENOSTR 60 /* Device not a stream */
|
|
#define ENODATA 61 /* No data (for no delay io) */
|
|
#define ETIME 62 /* Timer expired */
|
|
#define ENOSR 63 /* Out of streams resources */
|
|
#define ENONET 64 /* Machine is not on the network */
|
|
#define ENOPKG 65 /* Package not installed */
|
|
#define EREMOTE 66 /* The object is remote */
|
|
#define ENOLINK 67 /* The link has been severed */
|
|
#define EADV 68 /* Advertise error */
|
|
#define ESRMNT 69 /* Srmount error */
|
|
#define ECOMM 70 /* Communication error on send */
|
|
#define EPROTO 71 /* Protocol error */
|
|
#define EMULTIHOP 74 /* Multihop attempted */
|
|
#define ELBIN 75 /* Inode is remote (not really error) */
|
|
#define EDOTDOT 76 /* Cross mount point (not really error) */
|
|
#define EBADMSG 77 /* Trying to read unreadable message */
|
|
#define EOVERFLOW 78 /* Value too large to be stored in data type */
|
|
#define ENOTUNIQ 80 /* Given log. name not unique */
|
|
#define EBADFD 81 /* f.d. invalid for this operation */
|
|
#define EREMCHG 82 /* Remote address changed */
|
|
#define ELIBACC 83 /* Can't access a needed shared lib */
|
|
#define ELIBBAD 84 /* Accessing a corrupted shared lib */
|
|
#define ELIBSCN 85 /* .lib section in a.out corrupted */
|
|
#define ELIBMAX 86 /* Attempting to link in too many libs */
|
|
#define ELIBEXEC 87 /* Attempting to exec a shared library */
|
|
#define ENOSYS 88 /* Function not implemented */
|
|
#define ENMFILE 89 /* No more files */
|
|
#define ENOTEMPTY 90 /* Directory not empty */
|
|
#define ENAMETOOLONG 91 /* File or path name too long */
|
|
#define ELOOP 92 /* Too many symbolic links */
|
|
#define EOPNOTSUPP 95 /* Operation not supported on transport endpoint */
|
|
#define EPFNOSUPPORT 96 /* Protocol family not supported */
|
|
#define ECONNRESET 104 /* Connection reset by peer */
|
|
#define ENOBUFS 105 /* No buffer space available */
|
|
#define EAFNOSUPPORT 106 /* Address family not supported by protocol family */
|
|
#define EPROTOTYPE 107 /* Protocol wrong type for socket */
|
|
#define ENOTSOCK 108 /* Socket operation on non-socket */
|
|
#define ENOPROTOOPT 109 /* Protocol not available */
|
|
#define ESHUTDOWN 110 /* Can't send after socket shutdown */
|
|
#define ECONNREFUSED 111 /* Connection refused */
|
|
#define EADDRINUSE 112 /* Address already in use */
|
|
#define ECONNABORTED 113 /* Connection aborted */
|
|
#define ENETUNREACH 114 /* Network is unreachable */
|
|
#define ENETDOWN 115 /* Network interface is not configured */
|
|
#define ETIMEDOUT 116 /* Connection timed out */
|
|
#define EHOSTDOWN 117 /* Host is down */
|
|
#define EHOSTUNREACH 118 /* Host is unreachable */
|
|
#define EINPROGRESS 119 /* Connection already in progress */
|
|
#define EALREADY 120 /* Socket already connected */
|
|
#define EDESTADDRREQ 121 /* Destination address required */
|
|
#define EMSGSIZE 122 /* Message too long */
|
|
#define EPROTONOSUPPORT 123 /* Unknown protocol */
|
|
#define ESOCKTNOSUPPORT 124 /* Socket type not supported */
|
|
#define EADDRNOTAVAIL 125 /* Address not available */
|
|
#define ENETRESET 126
|
|
#define EISCONN 127 /* Socket is already connected */
|
|
#define ENOTCONN 128 /* Socket is not connected */
|
|
#define ETOOMANYREFS 129
|
|
#define EPROCLIM 130
|
|
#define EUSERS 131
|
|
#define EDQUOT 132
|
|
#define ESTALE 133
|
|
#define ENOTSUP 134 /* Not supported */
|
|
#define ENOMEDIUM 135 /* No medium (in tape drive) */
|
|
#define ENOSHARE 136 /* No such host or network path */
|
|
#define ECASECLASH 137 /* Filename exists with different case */
|
|
|
|
/* From cygwin32. */
|
|
#define EWOULDBLOCK EAGAIN /* Operation would block */
|
|
|
|
#define __ELASTERROR 2000 /* Users can add values starting here */
|
|
|
|
#endif /* _SYS_ERRNO_H */
|
|
#endif /* !SIMULATOR */
|