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VFS: prevent unmapping drivers that don't support reopening

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libchardriver does not support DEV_REOPEN and will return ERESTART
when you do try it. This made VFS unhappy and concluded erroneously
that the driver was EDEADEPT.
This commit is contained in:
Thomas Veerman 2013-02-15 16:00:21 +01:00
parent ba49a155b5
commit cfcce207c1
1 changed files with 9 additions and 3 deletions
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12
servers/vfs/device.c
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@ -700,7 +700,7 @@ message *mess_ptr; /* pointer to message for task */
/* All file system I/O ultimately comes down to I/O on major/minor device
* pairs. These lead to calls on the following routines via the dmap table.
*/
int r, status, proc_e = NONE, is_bdev, retry_count;
int r, status = OK, proc_e = NONE, is_bdev, retry_count;
message mess_retry;
is_bdev = IS_BDEV_RQ(mess_ptr->m_type);
@ -722,7 +722,13 @@ message *mess_ptr; /* pointer to message for task */
retry_count++;
}
}
} while (r == EDEADEPT && retry_count < 5);
} while (status == ERESTART && retry_count < 5);
/* If we failed to restart the request, return EIO */
if (status == ERESTART && retry_count >= 5) {
r = OK;
mess_ptr->m_type = EIO;
}
if (r != OK) {
if (r == EDEADSRCDST || r == EDEADEPT) {
@ -1103,6 +1109,7 @@ int maj;
struct fproc *rfp;
if (maj < 0 || maj >= NR_DEVICES) panic("VFS: out-of-bound major");
for (rfilp = filp; rfilp < &filp[NR_FILPS]; rfilp++) {
if (rfilp->filp_count < 1 || !(vp = rfilp->filp_vno)) continue;
if (!(rfilp->filp_state & FS_NEEDS_REOPEN)) continue;
@ -1141,7 +1148,6 @@ int maj;
/* Nothing more to re-open. Restart suspended processes */
driver_e = dmap[maj].dmap_driver;
for (rfp = &fproc[0]; rfp < &fproc[NR_PROCS]; rfp++) {
if(rfp->fp_pid == PID_FREE) continue;
if(rfp->fp_blocked_on == FP_BLOCKED_ON_OTHER &&