| Message ID | 20241210170224.19159-5-James.Bottomley@HansenPartnership.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | convert efivarfs to manage object data correctly | expand |
On Tue, Dec 10, 2024 at 12:02:22PM -0500, James Bottomley wrote: > Make the inodes the default management vehicle for struct > efivar_entry, so they are now all freed automatically if the file is > removed and on unmount in kill_litter_super(). Remove the now > superfluous iterator to free the entries after kill_litter_super(). > > Also fixes a bug where some entry freeing was missing causing efivarfs > to leak memory. > > Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> > --- This looks like a good idea to me. > fs/efivarfs/internal.h | 1 - > fs/efivarfs/super.c | 15 +++++++-------- > fs/efivarfs/vars.c | 39 +++------------------------------------ > 3 files changed, 10 insertions(+), 45 deletions(-) > > diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h > index 84a36e6fb653..d768bfa7f12b 100644 > --- a/fs/efivarfs/internal.h > +++ b/fs/efivarfs/internal.h > @@ -37,7 +37,6 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *, > > int efivar_entry_add(struct efivar_entry *entry, struct list_head *head); > void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head); > -void efivar_entry_remove(struct efivar_entry *entry); > int efivar_entry_delete(struct efivar_entry *entry); > > int efivar_entry_size(struct efivar_entry *entry, unsigned long *size); > diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c > index dc3870ae784b..70b99f58c906 100644 > --- a/fs/efivarfs/super.c > +++ b/fs/efivarfs/super.c > @@ -41,6 +41,12 @@ static int efivarfs_ops_notifier(struct notifier_block *nb, unsigned long event, > > static void efivarfs_evict_inode(struct inode *inode) > { > + struct efivar_entry *entry = inode->i_private; > + > + if (entry) { > + list_del(&entry->list); > + kfree(entry); > + } > clear_inode(inode); > } > > @@ -269,13 +275,6 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, > return err; > } > > -static int efivarfs_destroy(struct efivar_entry *entry, void *data) > -{ > - efivar_entry_remove(entry); > - kfree(entry); > - return 0; > -} > - > enum { > Opt_uid, Opt_gid, > }; > @@ -398,7 +397,7 @@ static void efivarfs_kill_sb(struct super_block *sb) > kill_litter_super(sb); > > /* Remove all entries and destroy */ > - efivar_entry_iter(efivarfs_destroy, &sfi->efivarfs_list, NULL); > + WARN_ON(!list_empty(&sfi->efivarfs_list)); > kfree(sfi); > } > > diff --git a/fs/efivarfs/vars.c b/fs/efivarfs/vars.c > index f6380fdbe173..bda8e8b869e8 100644 > --- a/fs/efivarfs/vars.c > +++ b/fs/efivarfs/vars.c > @@ -485,34 +485,6 @@ void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head) > list_add(&entry->list, head); > } > > -/** > - * efivar_entry_remove - remove entry from variable list > - * @entry: entry to remove from list > - * > - * Returns 0 on success, or a kernel error code on failure. > - */ > -void efivar_entry_remove(struct efivar_entry *entry) > -{ > - list_del(&entry->list); > -} > - > -/* > - * efivar_entry_list_del_unlock - remove entry from variable list > - * @entry: entry to remove > - * > - * Remove @entry from the variable list and release the list lock. > - * > - * NOTE: slightly weird locking semantics here - we expect to be > - * called with the efivars lock already held, and we release it before > - * returning. This is because this function is usually called after > - * set_variable() while the lock is still held. > - */ > -static void efivar_entry_list_del_unlock(struct efivar_entry *entry) > -{ > - list_del(&entry->list); > - efivar_unlock(); > -} > - > /** > * efivar_entry_delete - delete variable and remove entry from list > * @entry: entry containing variable to delete > @@ -536,12 +508,10 @@ int efivar_entry_delete(struct efivar_entry *entry) > status = efivar_set_variable_locked(entry->var.VariableName, > &entry->var.VendorGuid, > 0, 0, NULL, false); > - if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) { > - efivar_unlock(); > + efivar_unlock(); > + if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) > return efi_status_to_err(status); > - } > > - efivar_entry_list_del_unlock(entry); > return 0; > } > > @@ -679,10 +649,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes, > &entry->var.VendorGuid, > NULL, size, NULL); > > - if (status == EFI_NOT_FOUND) > - efivar_entry_list_del_unlock(entry); > - else > - efivar_unlock(); > + efivar_unlock(); > > if (status && status != EFI_BUFFER_TOO_SMALL) > return efi_status_to_err(status); > -- > 2.35.3 >
diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h index 84a36e6fb653..d768bfa7f12b 100644 --- a/fs/efivarfs/internal.h +++ b/fs/efivarfs/internal.h @@ -37,7 +37,6 @@ int efivar_init(int (*func)(efi_char16_t *, efi_guid_t, unsigned long, void *, int efivar_entry_add(struct efivar_entry *entry, struct list_head *head); void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head); -void efivar_entry_remove(struct efivar_entry *entry); int efivar_entry_delete(struct efivar_entry *entry); int efivar_entry_size(struct efivar_entry *entry, unsigned long *size); diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index dc3870ae784b..70b99f58c906 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -41,6 +41,12 @@ static int efivarfs_ops_notifier(struct notifier_block *nb, unsigned long event, static void efivarfs_evict_inode(struct inode *inode) { + struct efivar_entry *entry = inode->i_private; + + if (entry) { + list_del(&entry->list); + kfree(entry); + } clear_inode(inode); } @@ -269,13 +275,6 @@ static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, return err; } -static int efivarfs_destroy(struct efivar_entry *entry, void *data) -{ - efivar_entry_remove(entry); - kfree(entry); - return 0; -} - enum { Opt_uid, Opt_gid, }; @@ -398,7 +397,7 @@ static void efivarfs_kill_sb(struct super_block *sb) kill_litter_super(sb); /* Remove all entries and destroy */ - efivar_entry_iter(efivarfs_destroy, &sfi->efivarfs_list, NULL); + WARN_ON(!list_empty(&sfi->efivarfs_list)); kfree(sfi); } diff --git a/fs/efivarfs/vars.c b/fs/efivarfs/vars.c index f6380fdbe173..bda8e8b869e8 100644 --- a/fs/efivarfs/vars.c +++ b/fs/efivarfs/vars.c @@ -485,34 +485,6 @@ void __efivar_entry_add(struct efivar_entry *entry, struct list_head *head) list_add(&entry->list, head); } -/** - * efivar_entry_remove - remove entry from variable list - * @entry: entry to remove from list - * - * Returns 0 on success, or a kernel error code on failure. - */ -void efivar_entry_remove(struct efivar_entry *entry) -{ - list_del(&entry->list); -} - -/* - * efivar_entry_list_del_unlock - remove entry from variable list - * @entry: entry to remove - * - * Remove @entry from the variable list and release the list lock. - * - * NOTE: slightly weird locking semantics here - we expect to be - * called with the efivars lock already held, and we release it before - * returning. This is because this function is usually called after - * set_variable() while the lock is still held. - */ -static void efivar_entry_list_del_unlock(struct efivar_entry *entry) -{ - list_del(&entry->list); - efivar_unlock(); -} - /** * efivar_entry_delete - delete variable and remove entry from list * @entry: entry containing variable to delete @@ -536,12 +508,10 @@ int efivar_entry_delete(struct efivar_entry *entry) status = efivar_set_variable_locked(entry->var.VariableName, &entry->var.VendorGuid, 0, 0, NULL, false); - if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) { - efivar_unlock(); + efivar_unlock(); + if (!(status == EFI_SUCCESS || status == EFI_NOT_FOUND)) return efi_status_to_err(status); - } - efivar_entry_list_del_unlock(entry); return 0; } @@ -679,10 +649,7 @@ int efivar_entry_set_get_size(struct efivar_entry *entry, u32 attributes, &entry->var.VendorGuid, NULL, size, NULL); - if (status == EFI_NOT_FOUND) - efivar_entry_list_del_unlock(entry); - else - efivar_unlock(); + efivar_unlock(); if (status && status != EFI_BUFFER_TOO_SMALL) return efi_status_to_err(status);
Make the inodes the default management vehicle for struct efivar_entry, so they are now all freed automatically if the file is removed and on unmount in kill_litter_super(). Remove the now superfluous iterator to free the entries after kill_litter_super(). Also fixes a bug where some entry freeing was missing causing efivarfs to leak memory. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> --- fs/efivarfs/internal.h | 1 - fs/efivarfs/super.c | 15 +++++++-------- fs/efivarfs/vars.c | 39 +++------------------------------------ 3 files changed, 10 insertions(+), 45 deletions(-)