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Annotation of dmsdos/patches/cvf.c.README, revision 1.1.1.1

1.1       root        1: 
                      2: Update to CVF-FAT 1.1.0 or 1.2.0
                      3: --------------------------------
                      4: 
                      5: Today's kernels (currently means in time of Linux 2.2.2) use still CVF-FAT
                      6: interface version 1.0.0. That is a bit outdated (and known to have one minor
                      7: bug and some missing features).
                      8: 
                      9: Latest versions are:
                     10:    * CVF-FAT version 1.1.0 for 2.0.xx kernels
                     11:    * CVF-FAT version 1.2.0 for kernels 2.1.128 or newer (also 2.2.x)
                     12:    (The break between those two is somewhere between 2.1.94 and 2.1.128,
                     13:    exactly it should be when kerneld was replaced by kmod, but I have never
                     14:    verified that. Better use 2.0 or 2.2 kernels. :) )
                     15:    
                     16: Files:
                     17: 
                     18:    cvf.c:             CVF-FAT 1.1.0. For kernels that support kerneld.
                     19:    fat_cvf.txt:       Documentation for CVF-FAT 1.1.0 (in file cvf.c).
                     20: 
                     21:    cvf.c-2.1.128:     CVF-FAT 1.2.0. For newer kernels that support kmod 
                     22:                       instead of kerneld (including 2.2.x kernels).
                     23:    fat_cvf.txt-2.1.128: Documentation for CVF-FAT 1.2.0 (in file
                     24:                       cvf.c-2.1.128).
                     25: 
                     26: These files _replace_ the respective files in the kernel sources:
                     27: 
                     28:    linux/fs/fat/cvf.c
                     29:    linux/fs/Documentation/filesystems/fat_cvf.txt
                     30: 
                     31: The only difference between CVF-FAT 1.1.0 and 1.2.0 is that 1.2.0 has
                     32: been rewritten for kmod support which replaces kerneld in latest 2.1.xx
                     33: kernels (and also 2.2.x kernels). 
                     34: *** Be sure to use the right file for your kernel! You must check the
                     35:     kernel source or kernel documentation in order to find out whether 
                     36:     your kernel supports kerneld or kmod. At least, I know that all 2.0.xx 
                     37:     kernels support kerneld. Also, I checked that 2.1.128 uses kmod. Newer
                     38:     kernels also should support kmod. That's all I know. You're on your 
                     39:     own here to find that out. A kernel that supports kmod should have a
                     40:     file linux/Documentation/kmod.txt or similar, but I'm not 100% sure :)
                     41: 
                     42: Who should update
                     43: -----------------
                     44: 
                     45: If you are using CVF-FAT 1.0.0 or older you may want to update. Watch for a 
                     46: version number in file linux/fs/fat/cvf.c. There should be a line somewhere 
                     47: at the beginning of the file that reads "CVF-FAT-VERSION-ID: x.y.z" where 
                     48: "x.y.z" is the version number. If this line is missing you are using version 
                     49: 1.0.0 or older.
                     50: 
                     51: Why update
                     52: ----------
                     53: 
                     54: It fixes a bug that lets the mount command silently succeed if there is a
                     55: special kind of error. This bug sometimes caused the plain FAT driver to
                     56: mount a CVF in case of error with CVF-FAT support, which is surely not a
                     57: good idea :) 
                     58: 
                     59: Now 'mount' fails with an error message in that case.
                     60: 
                     61: Also the kerneld/kmod-autoload feature is now permanently in that file so you
                     62: do not have to apply it as a seperate patch. For latest 2.1.xx kernels,
                     63: where kerneld has been replaced by kmod, the kerneld-autoload support has
                     64: been rewritten to use kmod instead.
                     65: 
                     66: How to update
                     67: -------------
                     68: 
                     69: You can simply replace the old files with the new ones as listed above.
                     70: Then recompile your modules (or your kernel if fat support is not modular).

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