1*433d6423SLionel Sambuc #ifndef _PROCFS_CONST_H 2*433d6423SLionel Sambuc #define _PROCFS_CONST_H 3*433d6423SLionel Sambuc 4*433d6423SLionel Sambuc /* The minimum number of inodes depends on a number of factors: 5*433d6423SLionel Sambuc * - Each statically created inode (e.g., /proc/hz) needs an inode. As of 6*433d6423SLionel Sambuc * writing, this requires about a dozen inodes. 7*433d6423SLionel Sambuc * - Deleted inodes that are still in use by VFS must be retained. For deleted 8*433d6423SLionel Sambuc * directories, all their containing directories up to the root must be 9*433d6423SLionel Sambuc * retained as well (to allow the user to "cd .." out). VTreeFS already takes 10*433d6423SLionel Sambuc * care of this. In the case of ProcFS, only PID-based directories can be 11*433d6423SLionel Sambuc * deleted; no other directories are dynamically created. These directories 12*433d6423SLionel Sambuc * currently do not contain subdirectories, either. Hence, for deleted open 13*433d6423SLionel Sambuc * inodes, we need to reserve at most NR_VNODES inodes in the worst case. 14*433d6423SLionel Sambuc * - In order for getdents to be able to return all PID-based directories, 15*433d6423SLionel Sambuc * inodes must not be recycled while generating the list of these PID-based 16*433d6423SLionel Sambuc * directories. In the worst case, this means (NR_TASKS + NR_PROCS) extra 17*433d6423SLionel Sambuc * inodes. 18*433d6423SLionel Sambuc * The sum of these is the bare minimum for correct operation in all possible 19*433d6423SLionel Sambuc * circumstances. In practice, not all open files will be deleted files in 20*433d6423SLionel Sambuc * ProcFS, and not all process slots will be in use either, so the average use 21*433d6423SLionel Sambuc * will be a lot less. However, setting the value too low allows for a 22*433d6423SLionel Sambuc * potential denial-of-service attack by a non-root user. 23*433d6423SLionel Sambuc * 24*433d6423SLionel Sambuc * For the moment, we simply set this value to something reasonable. 25*433d6423SLionel Sambuc */ 26*433d6423SLionel Sambuc #define NR_INODES ((NR_TASKS + NR_PROCS) * 4) 27*433d6423SLionel Sambuc 28*433d6423SLionel Sambuc /* Various file modes. */ 29*433d6423SLionel Sambuc #define REG_ALL_MODE (S_IFREG | 0444) /* world-readable regular */ 30*433d6423SLionel Sambuc #define DIR_ALL_MODE (S_IFDIR | 0555) /* world-accessible directory */ 31*433d6423SLionel Sambuc #define LNK_ALL_MODE (S_IFLNK | 0777) /* symbolic link */ 32*433d6423SLionel Sambuc 33*433d6423SLionel Sambuc #endif /* _PROCFS_CONST_H */ 34