bsd/kern/decmpfs.c

6  * This file contains Original Code and/or Modifications of Original Code
8  * Version 2.0 (the 'License'). You may not use this file except in
16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
88     const char *file;
93 _malloc(uint32_t sz, __unused int type, __unused int flags, const char *file, int line)
109     alloc->file = file;
121 _free(char *ret, __unused int type, const char *file, int line)
141     alloc2->file = file;
250 	ErrorLog("tried to access a compressed file of unregistered type %d\n", type);
452         /* this file's xattr didn't have any extra data when we fetched it, so we can synthesize a header from the data in the cnode */
549             ErrorLog("decmpfs_fast_get_state called on unknown file\n");
574             ErrorLog("decmpfs_fast_get_state called on unknown file\n");
586     /* give a compressor a chance to indicate that a compressed file is invalid */
593             /* the file is no longer compressed, so return success */
626      determines whether vp points to a compressed file
646          since named streams of the same file share the same cnode,
660             /* treat the file as compressed, because this gives us a way to block future reads until decompression is done */
666             /* unknown state, assume file is not compressed */
701         /* failed to get the bsd flags so the file is not compressed */
706 		/* UF_COMPRESSED is on, make sure the file has the DECMPFS_XATTR_NAME xattr */
712             /* failed to get the xattr so the file is not compressed */
716         /* we got the xattr, so the file is compressed */
720     /* UF_COMPRESSED isn't on, so the file isn't compressed */
746             /* update the ubc's size for this file */
774             /* unknown state, assume file is not compressed */
801                  * Compression bit was turned on, make sure the file has the DECMPFS_XATTR_NAME attribute.
820                      in that case, we also want to truncate the data fork of the file
825                     /* the file had a decmpfs attribute but the type was out of range, so don't muck with the file's data size */
846             /* file is not decompressing */
864 	 This routine should only be called after a file has already been through decmpfs_file_is_compressed
885 	 This routine should only be called after a file has already been through decmpfs_file_is_compressed
893     /* file is not compressed, so don't hide this xattr */
995         /* reading past end of file; nothing to do */
1000         /* tried to read from before start of file */
1005         /* adjust size so we don't read past the end of the file */
1062     /* handles a page-in request from vfs for a compressed file */
1111     /* clip the size to the size of the file */
1113         /* truncate the read to the size of the file */
1129 		 if the file is converting, this must be a recursive call to pagein from underneath a call to decmpfs_decompress_file;
1151             /* the file was decompressed after we started reading it */
1186     /* handles a read request from vfs for a compressed file */
1218         /* truncate the read to the size of the file */
1232         /* truncate the read to the size of the file */
1260         /* give the compressor a chance to adjust the portion of the file that we read */
1266     /* clip the adjusted size to the size of the file */
1268         /* truncate the read to the size of the file */
1278      since we're going to create a upl for the given region of the file,
1338             /* maybe the file is converting to decompressed */
1351                 /* the file was decompressed after we started reading it */
1422      call out to the decompressor to free remove any data associated with this compressed file
1423      then delete the file's compression xattr
1457 #pragma mark --- file conversion routines ---
1488 	/* convert a compressed file to an uncompressed file */
1513 			/* someone else decompressed the file */
1520 			/* the file is in an unknown state, so update the state and retry */
1529 			/* the file is compressed, so decompress it */
1555 		/* special case truncating the file to zero bytes */
1558 		/* the caller is trying to grow the file, so we should decompress all the data */
1578 	/* tell the buffer cache that this is an empty file */
1581 	/* if we got here, we need to decompress the file */
1585 		/* loop decompressing data from the file and writing it into the data fork */
1610 			/* if the write failed, truncate the file to zero bytes */
1620 			ErrorLog("file decompressed to %lld instead of %lld\n", offset, toSize);
1647 	/* if we're truncating the file to zero bytes, we'll skip ahead to here */
1652 	/* free the compressed data associated with this file */
1660 	 since we succeeded in writing all of the file data to the data fork
1664 	/* if we got this far, the file was successfully decompressed */
1672 		DebugLog("new file size %lld\n", filesize);