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    • /[magellan-source]/trunk/mkinitrd-magellan/busybox/libbb/loop.c

    Diff of /trunk/mkinitrd-magellan/busybox/libbb/loop.c

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    revision 815 by niro, Sat Sep 1 22:45:15 2007 UTC revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
    # Line 44  typedef struct { Line 44  typedef struct {
    44  } bb_loop_info;  } bb_loop_info;
    45  #endif  #endif
    46    
    47  char *query_loop(const char *device)  char* FAST_FUNC query_loop(const char *device)
    48  {  {
    49   int fd;   int fd;
    50   bb_loop_info loopinfo;   bb_loop_info loopinfo;
    # Line 61  char *query_loop(const char *device) Line 61  char *query_loop(const char *device)
    61  }  }
    62    
    63    
    64  int del_loop(const char *device)  int FAST_FUNC del_loop(const char *device)
    65  {  {
    66   int fd, rc;   int fd, rc;
    67    
    # Line 79  int del_loop(const char *device) Line 79  int del_loop(const char *device)
    79     search will re-use an existing loop device already bound to that     search will re-use an existing loop device already bound to that
    80     file/offset if it finds one.     file/offset if it finds one.
    81   */   */
    82  int set_loop(char **device, const char *file, unsigned long long offset)  int FAST_FUNC set_loop(char **device, const char *file, unsigned long long offset)
    83  {  {
    84   char dev[20], *try;   char dev[LOOP_NAMESIZE];
    85     char *try;
    86   bb_loop_info loopinfo;   bb_loop_info loopinfo;
    87   struct stat statbuf;   struct stat statbuf;
    88   int i, dfd, ffd, mode, rc=-1;   int i, dfd, ffd, mode, rc = -1;
    89    
    90   /* Open the file.  Barf if this doesn't work.  */   /* Open the file.  Barf if this doesn't work.  */
    91   mode = O_RDWR;   mode = O_RDWR;
    # Line 98  int set_loop(char **device, const char * Line 99  int set_loop(char **device, const char *
    99    
    100   /* Find a loop device.  */   /* Find a loop device.  */
    101   try = *device ? : dev;   try = *device ? : dev;
    102   for (i=0;rc;i++) {   for (i = 0; rc; i++) {
    103   sprintf(dev, LOOP_FORMAT, i);   sprintf(dev, LOOP_FORMAT, i);
    104    
    105   /* Ran out of block devices, return failure.  */   /* Ran out of block devices, return failure.  */
    106   if (stat(try, &statbuf) || !S_ISBLK(statbuf.st_mode)) {   if (stat(try, &statbuf) || !S_ISBLK(statbuf.st_mode)) {
    107   rc=-ENOENT;   rc = -ENOENT;
    108   break;   break;
    109   }   }
    110   /* Open the sucker and check its loopiness.  */   /* Open the sucker and check its loopiness.  */
    # Line 112  int set_loop(char **device, const char * Line 113  int set_loop(char **device, const char *
    113   mode = O_RDONLY;   mode = O_RDONLY;
    114   dfd = open(try, mode);   dfd = open(try, mode);
    115   }   }
    116   if (dfd < 0) goto try_again;   if (dfd < 0)
    117     goto try_again;
    118    
    119   rc = ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo);   rc = ioctl(dfd, BB_LOOP_GET_STATUS, &loopinfo);
    120    
    121   /* If device free, claim it.  */   /* If device is free, claim it.  */
    122   if (rc && errno == ENXIO) {   if (rc && errno == ENXIO) {
    123   memset(&loopinfo, 0, sizeof(loopinfo));   memset(&loopinfo, 0, sizeof(loopinfo));
    124   safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE);   safe_strncpy((char *)loopinfo.lo_file_name, file, LO_NAME_SIZE);
    125   loopinfo.lo_offset = offset;   loopinfo.lo_offset = offset;
    126   /* Associate free loop device with file.  */   /* Associate free loop device with file.  */
    127   if (!ioctl(dfd, LOOP_SET_FD, ffd)) {   if (!ioctl(dfd, LOOP_SET_FD, ffd)) {
    128   if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo)) rc = 0;   if (!ioctl(dfd, BB_LOOP_SET_STATUS, &loopinfo))
    129   else ioctl(dfd, LOOP_CLR_FD, 0);   rc = 0;
    130     else
    131     ioctl(dfd, LOOP_CLR_FD, 0);
    132   }   }
    133    
    134   /* If this block device already set up right, re-use it.   /* If this block device already set up right, re-use it.
    # Line 132  int set_loop(char **device, const char * Line 136  int set_loop(char **device, const char *
    136     file isn't pretty either.  In general, mounting the same file twice     file isn't pretty either.  In general, mounting the same file twice
    137     without using losetup manually is problematic.)     without using losetup manually is problematic.)
    138   */   */
    139   } else if (strcmp(file,(char *)loopinfo.lo_file_name)   } else if (strcmp(file, (char *)loopinfo.lo_file_name) != 0
    140   || offset != loopinfo.lo_offset) {   || offset != loopinfo.lo_offset) {
    141   rc = -1;   rc = -1;
    142   }   }
    143   close(dfd);   close(dfd);
    144  try_again:   try_again:
    145   if (*device) break;   if (*device) break;
    146   }   }
    147   close(ffd);   close(ffd);
    148   if (!rc) {   if (!rc) {
    149   if (!*device) *device = xstrdup(dev);   if (!*device)
    150   return mode==O_RDONLY ? 1 : 0;   *device = xstrdup(dev);
    151     return (mode == O_RDONLY); /* 1:ro, 0:rw */
    152   }   }
    153   return rc;   return rc;
    154  }  }
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