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UBI: allocate memory with GFP_NOFS

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Use GFP_NOFS flag when allocating memory on I/O path, because otherwise
we may deadlock the filesystem which works on top of us. We observed
the deadlocks with UBIFS. Example:

VFS->FS lock a lock->UBI->kmalloc()->VFS writeback->FS locks the same
lock again.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy 2007-08-28 21:29:32 +03:00
parent ef6075fbfc
commit 33818bbb84
6 changed files with 21 additions and 19 deletions
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12
drivers/mtd/ubi/eba.c
View file

@ -157,7 +157,7 @@ static struct ltree_entry *ltree_add_entry(struct ubi_device *ubi, int vol_id,
{
struct ltree_entry *le, *le1, *le_free;
le = kmem_cache_alloc(ltree_slab, GFP_KERNEL);
le = kmem_cache_alloc(ltree_slab, GFP_NOFS);
if (!le)
return ERR_PTR(-ENOMEM);
@ -397,7 +397,7 @@ int ubi_eba_read_leb(struct ubi_device *ubi, int vol_id, int lnum, void *buf,
retry:
if (check) {
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr) {
err = -ENOMEM;
goto out_unlock;
@ -497,7 +497,7 @@ static int recover_peb(struct ubi_device *ubi, int pnum, int vol_id, int lnum,
struct ubi_vid_hdr *vid_hdr;
unsigned char *new_buf;
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr) {
return -ENOMEM;
}
@ -627,7 +627,7 @@ int ubi_eba_write_leb(struct ubi_device *ubi, int vol_id, int lnum,
* The logical eraseblock is not mapped. We have to get a free physical
* eraseblock and write the volume identifier header there first.
*/
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr) {
leb_write_unlock(ubi, vol_id, lnum);
return -ENOMEM;
@ -738,7 +738,7 @@ int ubi_eba_write_leb_st(struct ubi_device *ubi, int vol_id, int lnum,
else
ubi_assert(len % ubi->min_io_size == 0);
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr)
return -ENOMEM;
@ -844,7 +844,7 @@ int ubi_eba_atomic_leb_change(struct ubi_device *ubi, int vol_id, int lnum,
if (ubi->ro_mode)
return -EROFS;
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr)
return -ENOMEM;

4
drivers/mtd/ubi/io.c
View file

@ -1099,7 +1099,7 @@ static int paranoid_check_peb_ec_hdr(const struct ubi_device *ubi, int pnum)
uint32_t crc, hdr_crc;
struct ubi_ec_hdr *ec_hdr;
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
if (!ec_hdr)
return -ENOMEM;
@ -1179,7 +1179,7 @@ static int paranoid_check_peb_vid_hdr(const struct ubi_device *ubi, int pnum)
struct ubi_vid_hdr *vid_hdr;
void *p;
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr)
return -ENOMEM;

4
drivers/mtd/ubi/scan.c
View file

@ -323,7 +323,7 @@ static int compare_lebs(const struct ubi_device *ubi,
} else {
pnum = seb->pnum;
vh = ubi_zalloc_vid_hdr(ubi);
vh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
if (!vh)
return -ENOMEM;
@ -948,7 +948,7 @@ struct ubi_scan_info *ubi_scan(struct ubi_device *ubi)
if (!ech)
goto out_si;
vidh = ubi_zalloc_vid_hdr(ubi);
vidh = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
if (!vidh)
goto out_ech;

6
drivers/mtd/ubi/ubi.h
View file

@ -439,16 +439,18 @@ int ubi_io_write_vid_hdr(const struct ubi_device *ubi, int pnum,
/**
* ubi_zalloc_vid_hdr - allocate a volume identifier header object.
* @ubi: UBI device description object
* @gfp_flags: GFP flags to allocate with
*
* This function returns a pointer to the newly allocated and zero-filled
* volume identifier header object in case of success and %NULL in case of
* failure.
*/
static inline struct ubi_vid_hdr *ubi_zalloc_vid_hdr(const struct ubi_device *ubi)
static inline struct ubi_vid_hdr *
ubi_zalloc_vid_hdr(const struct ubi_device *ubi, gfp_t gfp_flags)
{
void *vid_hdr;
vid_hdr = kzalloc(ubi->vid_hdr_alsize, GFP_KERNEL);
vid_hdr = kzalloc(ubi->vid_hdr_alsize, gfp_flags);
if (!vid_hdr)
return NULL;

2
drivers/mtd/ubi/vtbl.c
View file

@ -264,7 +264,7 @@ static int create_vtbl(const struct ubi_device *ubi, struct ubi_scan_info *si,
ubi_msg("create volume table (copy #%d)", copy + 1);
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
if (!vid_hdr)
return -ENOMEM;

12
drivers/mtd/ubi/wl.c
View file

@ -508,7 +508,7 @@ int ubi_wl_get_peb(struct ubi_device *ubi, int dtype)
ubi_assert(dtype == UBI_LONGTERM || dtype == UBI_SHORTTERM ||
dtype == UBI_UNKNOWN);
pe = kmalloc(sizeof(struct ubi_wl_prot_entry), GFP_KERNEL);
pe = kmalloc(sizeof(struct ubi_wl_prot_entry), GFP_NOFS);
if (!pe)
return -ENOMEM;
@ -645,7 +645,7 @@ static int sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e, int tortur
if (err > 0)
return -EINVAL;
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
if (!ec_hdr)
return -ENOMEM;
@ -768,7 +768,7 @@ static int schedule_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
dbg_wl("schedule erasure of PEB %d, EC %d, torture %d",
e->pnum, e->ec, torture);
wl_wrk = kmalloc(sizeof(struct ubi_work), GFP_KERNEL);
wl_wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);
if (!wl_wrk)
return -ENOMEM;
@ -802,7 +802,7 @@ static int wear_leveling_worker(struct ubi_device *ubi, struct ubi_work *wrk,
if (cancel)
return 0;
vid_hdr = ubi_zalloc_vid_hdr(ubi);
vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_NOFS);
if (!vid_hdr)
return -ENOMEM;
@ -1028,7 +1028,7 @@ static int ensure_wear_leveling(struct ubi_device *ubi)
ubi->wl_scheduled = 1;
spin_unlock(&ubi->wl_lock);
wrk = kmalloc(sizeof(struct ubi_work), GFP_KERNEL);
wrk = kmalloc(sizeof(struct ubi_work), GFP_NOFS);
if (!wrk) {
err = -ENOMEM;
goto out_cancel;
@ -1631,7 +1631,7 @@ static int paranoid_check_ec(const struct ubi_device *ubi, int pnum, int ec)
long long read_ec;
struct ubi_ec_hdr *ec_hdr;
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
if (!ec_hdr)
return -ENOMEM;