2008/11/26 Stephen Samuel <darkonc@xxxxxxxxx>: > It's an application issue. It has to do with how the file is updated. > There are two ways for an editor to update a file: > write to the file in place, (nostly done with simple appends) or > write a new version of the file (with a temporary name), then rename the > temporary file to replace the old one. > > The first method only modifies the existing file, so the Inode number > changes the same. > > The secondmethod creates a new file (with a different inode number) and then > the new file (with the new inode number) replaces the old file. > > THe main advantage of the second method is that it's atomic. Either the file > is replaced, or it isn't. Thus other users/programs which accesss the file > never see intermediate results. (also the case if the program dies, or the > system is reset). Just curious...How is done that?There's a system call to do this replacement? Thanks! > The first method has the advantage that the inode# stays the same, and so > any programs which had the old file open will see the updates. The > disadvantate is that if anything goes wrong in the middle of the update, the > file could end up in an partial update state. > > Remember, the file is nothing more than a collection of bytes. There's no > way to insert a character or two in the middle of the file. You then have to > rewrite the entire file from that point on. > > On Tue, Nov 25, 2008 at 8:40 PM, lakshmi pathi <lakshmipathi.g@xxxxxxxxx> > wrote: >> >> I have noticed that whenever you edit a file content,a new inode >> number is assigned with the File. >> But Sometime file changes the inode number,Sometimes it remains as older >> inode. >> >> Can anyone please let know the concept behind this - modifing content >> changes the file's inode but not all the time? >> >> I'm using Fedora 7 with ext3 file system. (Kernel : 2.6.25.4) > > -- > Stephen Samuel http://www.bcgreen.com > 778-861-7641 > > _______________________________________________ > Ext3-users mailing list > Ext3-users@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/ext3-users > -- Jordi _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
