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Top Forums Programming A simple C program query ... Post 302569259 by Praveen_218 on Sunday 30th of October 2011 12:07:01 PM
Old 10-30-2011
Imagine that the lock is already taken, then following cases arise:
1) What if the task is not the same (which is possible and ext3_write_super() is callable concurrently (via VFS) from different kernel thread contexts which is writing on a same file system (on different volumes or same one for different writes).

In this case using sb->s_dirt in anyway is wrong.

2) Even if it's the same task which has taken lock before calling ext3_write_super() the if() block should test if (mutex_trylock(&sb->s_lock) == 0) instead of if (mutex_trylock(&sb->s_lock) != 0) .

By testing for if (mutex_trylock(&sb->s_lock) != 0) ; on new lock just taken it's calling BUG() which is designed to dump core only.
 

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ppmtosixel(1)                                                 General Commands Manual                                                ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)
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